Tri-specific binding molecules that specifically bind to multiple cancer antigens

Abstract

The present invention relates to Tri-Specific Binding Molecules, which are multi-chain polypeptide molecules that possess three Binding Domains and are thus capable of mediating coordinated binding to three epitopes. The Tri-Specific Binding Molecule is preferably characterized in possessing binding domains that permit it to immunospecifically bind to: (1) an epitope of a first Cancer Antigen, (2) an epitope of a second Cancer Antigen, and (3) an epitope of a molecule that is expressed on the surface of an immune system effector cell, and are thus capable of localizing an immune system effector cell to a cell that expresses a Cancer Antigen, so as to thereby facilitate the killing of such cancer cell.

Claims

1. A multi-chain polypeptide-containing Tri-Specific Binding Molecule that immunospecifically binds to three different epitopes, comprising: (I) three different polypeptide chains covalently complexed together; (II) an Antigen-Binding Domain I that immunospecifically binds to an Epitope I present on a first antigen, an Antigen-Binding Domain II that immunospecifically binds to an Epitope II present on a second antigen, and an Antigen-Binding Domain III that immunospecifically binds to an Epitope III present on a third antigen; and (III) a Fc Domain; wherein: (A) one of Epitope I, Epitope II or Epitope III is an epitope of an Effector Cell Antigen, a second of Epitope I, Epitope II or Epitope III is an epitope of a first Cancer Antigen, and a third of Epitope I, Epitope II or Epitope III is an epitope of a second Cancer Antigen; (B) a first polypeptide chain comprises, in the N-terminus to C-terminus direction: (VL.sub.I Domain)-(Linker 1)-(VH.sub.II Domain)-(Linker 2)-(Heterodimer-Promoting Domain)-(Linker 3)-(CH2-CH3 Domain); or (Cysteine-Containing Domain)-(CH2-CH3 Domain)-(Linker 4)-(VL.sub.I Domain)-(Linker 1)-(VH.sub.II Domain)-(Linker 2)-(Heterodimer-Promoting Domain); (C) a second polypeptide chain comprises, in the N-terminus to C-terminus direction: (VL.sub.II Domain)-(Linker 1)-(VH.sub.I Domain)-(Linker 2)-(Heterodimer-Promoting Domain); (D) a third polypeptide chain comprises, in the N-terminus to C-terminus direction: (VL.sub.III Domain)-(Flexible Linker)-(VH.sub.III Domain)-(Cysteine-Containing Domain)-(CH2-CH3 Domain); or (CL Domain)-(VL.sub.III Domain)-(Flexible Linker)-(VH.sub.III Domain)-(CH1 Domain)-(Cysteine-Containing Domain)-(CH2-CH3 Domain); (E) the VL.sub.I Domain is a Light Chain Variable Domain of an immunoglobulin that binds to Epitope I, the VH.sub.I Domain is a Heavy Chain Variable Domain of an immunoglobulin that binds to Epitope I, the VL.sub.II Domain is a Light Chain Variable Domain of an immunoglobulin that binds to Epitope II, the VH.sub.II Domain is a Heavy Chain Variable Domain of an immunoglobulin that binds to Epitope II, the VL.sub.III Domain is a Light Chain Variable Domain of an immunoglobulin that binds to Epitope III, and the VH.sub.III Domain is a Heavy Chain Variable Domain of an immunoglobulin that binds to Epitope III; (F) the VL.sub.I Domain and the VH.sub.I Domain associate to form the Antigen-Binding Domain I, the VL.sub.II Domain and the VH.sub.II Domain associate to form the Antigen-Binding Domain II, the VL.sub.III Domain and the VH.sub.III Domain associate to form the Antigen-Binding Domain III, and the CH2-CH3 Domain of the first polypeptide chain and the CH2-CH3 Domain of the third polypeptide chain associate to form the Fc Domain; and (G) the Linker 1 comprises the sequence of SEQ ID NO: 33; the Linker 2 comprises the sequence of SEQ ID NO: 34 or 47; the Linker 3 comprises the sequence of SEQ ID NO: 46, 47, 48, 49, 50, 51, 152, or GCG or GGG; the Linker 4 comprises the sequence of SEQ ID NO: 50 or 152; the Heterodimer-Promoting Domain on the first polypeptide chain is an E-coil Domain and the Heterodimer-Promoting Domain on the second polypeptide chain is a K-coil Domain, or the Heterodimer-Promoting Domain on the first polypeptide chain is a K-coil Domain and the Heterodimer-Promoting Domain on the second polypeptide chain is an E-coil Domain, the E-coil Domain independently comprises the sequence of SEQ ID NO: 39 or 41, and the K-coil Domain independently comprises the sequence of SEQ ID NO: 40 or 42; the Cysteine-Containing Domain independently comprises the sequence of SEQ ID NO: 34, 36, 38, 48, 210 or 211; the CH1 Domain comprises the sequence of SEQ ID NO: 207 or 208; and the CL Domain comprises the sequence of SEQ ID NO: 210 or 211.

2. The Tri-Specific Binding Molecule of claim 1, wherein: the CH2-CH3 Domain of the first polypeptide chain is a knob-bearing CH2-CH3 Domain and the CH2-CH3 Domain of the third polypeptide chain is a hole-bearing CH2-CH3 Domain; or the CH2-CH3 Domain of the third polypeptide chain is a knob-bearing CH2-CH3 Domain and the CH2-CH3 Domain of the first polypeptide chain is a hole-bearing CH2-CH3 Domain.

3. The Tri-Specific Binding Molecule of claim 2, wherein: the knob-bearing CH2-CH3 Domain comprises the sequence of SEQ ID NO: 52, and the hole-bearing CH2-CH3 Domain comprises the sequence of SEQ ID NO: 53.

4. The Tri-Specific Binding Molecule of claim 1, wherein the CH2-CH3 Domain of the first polypeptide chain and the third polypeptide chain comprise at least one amino acid substitution, relative to the sequence of SEQ ID NO:1, and the Fc Domain formed from their association exhibits altered FcγR-mediated effector function.

5. The Tri-Specific Binding Molecule of claim 4, wherein the CH2-CH3 Domain of the first polypeptide chain and the third polypeptide chain comprise: (A) one substitution selected from the group consisting of: F243L, R292P, Y300L, V305I, and P396L; (B) two substitutions selected from the group consisting of: (1) F243L and P396L; (2) F243L and R292P; and (3) R292P and V305I; (C) three substitutions selected from the group consisting of: (1) F243L, R292P and Y300L; (2) F243L, R292P and V305I; (3) F243L, R292P and P396L; and (4) R292P, V305I and P396L; (D) four substitutions selected from the group consisting of: (1) F243L, R292P, Y300L and P396L; and (2) F243L, R292P, V305I and P396L; or (E) five substitutions selected from the group consisting of: (1) F243L, R292P, Y300L, V305I and P396L; and (2) L235V, F243L, R292P, Y300L and P396L.

6. The Tri-Specific Binding Molecule of claim 1, wherein: the Linker 2 comprises a cysteine residue, the E-coil Domain and the K-coil Domain adjacent to the Linker 2 each comprises a cysteine residue, or the Linker 2 comprises a cysteine residue and the E-coil Domain or the K-coil Domain adjacent to the Linker 2 comprises a cysteine residue.

7. The Tri-Specific Binding Molecule of claim 6, wherein: the E-coil Domain of SEQ ID NO: 41 or the K-coil Domain of SEQ ID NO: 42 is adjacent to the Linker 2 when the Linker 2 comprises the sequence of SEQ ID NO: 47; the E-coil Domain of SEQ ID NO: 39 or the K-coil Domain of SEQ ID NO: 40 is adjacent to the Linker 2 when the Linker 2 comprises the sequence of SEQ ID NO: 34; or the E-coil Domain of SEQ ID NO: 41 or the K-coil Domain of SEQ ID NO: 42 is adjacent to the Linker 2 when the Linker 2 comprises the sequence of SEQ ID NO: 34.

8. The Tri-Specific Binding Molecule of claim 1, wherein: (A) the Epitope I, Epitope II and Epitope III are, respectively, an epitope of the first Cancer Antigen, an epitope of the second Cancer Antigen and an epitope of the Effector Cell Antigen; (B) the Epitope I, Epitope II and Epitope III are, respectively, an epitope of the first Cancer Antigen, an epitope of the Effector Cell Antigen and an epitope of the second Cancer Antigen; (C) the Epitope I, Epitope II and Epitope III are, respectively, an epitope of second Cancer Antigen, an epitope of the first Cancer Antigen, and an epitope of the Effector Cell Antigen; (D) the Epitope I, Epitope II and Epitope III are, respectively, an epitope of the second Cancer Antigen, an epitope of the Effector Cell Antigen and an epitope of the first Cancer Antigen; (E) the Epitope I, Epitope II and Epitope III are, respectively, an epitope of the Effector Cell Antigen, an epitope of the first Cancer Antigen, and an epitope of the second Cancer Antigen; or (F) the Epitope I, Epitope II and Epitope III are, respectively, an epitope of the Effector Cell Antigen, an epitope of second Cancer Antigen, and an epitope of the first Cancer Antigen.

9. The Tri-Specific Binding Molecule of claim 1, wherein the Effector Cell Antigen is CD2, CD3, CD16, CD19, CD20, CD22, CD32B, CD64, B cell Receptor (BCR), T cell Receptor (TCR), or NKG2D Receptor.

10. The Tri-Specific Binding Molecule of any of claim 9, wherein: (A) the epitope of an Effector Cell Antigen is a CD2 epitope recognized by antibody Lo-CD2a; (B) the epitope of an Effector Cell Antigen is a CD3 epitope recognized by antibody OKT3, M291, YTH12.5, Anti-CD3 mAb 1 or Anti-CD3 mAb 2; (C) the epitope of an Effector Cell Antigen is a CD16 epitope recognized by antibody 3G8 or A9; (D) the epitope of an Effector Cell Antigen is a CD19 epitope recognized by antibody MD1342, MEDI-551, blinatumomab or HD37; (E) the epitope of an Effector Cell Antigen is a CD20 epitope recognized by antibody rituximab, ibritumomab, ofatumumab, and tositumomab; (F) the epitope of an Effector Cell Antigen is a CD22 epitope recognized by antibody epratuzumab; (G) the epitope of an Effector Cell Antigen is a CD32B epitope recognized by antibody CD32B mAb 1; (H) the epitope of an Effector Cell Antigen is a CD64 epitope recognized by antibody CD64 mAb 1; (I) the epitope of an Effector Cell Antigen is a BCR/CD79 epitope recognized by antibody CD79 mAb 1; (J) the epitope of an Effector Cell Antigen is a TCR epitope recognized by antibody BMA 031; (K) the epitope of an Effector Cell Antigen is a NKG2D Receptor epitope recognized by antibody KYK-2.0; or (L) one of Epitope I, Epitope II or Epitope III is an epitope of an Effector Cell Antigen and the Antigen-Binding Domain that immunospecifically binds to the epitope comprises: the six CDRs of SEQ ID NO:102 and 103; 104 and 108; 104 and 112; 114 and 115; 116 and 117; 118 and 119; 120 and 121; 122 and 123; 124 and 125; 126 and 127; 128 and 129; 130 and 131; 132 and 133; 134 and 135; or 136 and 137; or the Light Chain Variable Domain of SEQ ID NO:102 and the Heavy Chain Variable Domain of SEQ ID NO:103; the Light Chain Variable Domain of SEQ ID NO:104 and the Heavy Chain Variable Domain of SEQ ID NO:108; the Light Chain Variable Domain of SEQ ID NO:104 and the Heavy Chain Variable Domain of SEQ ID NO:112; the Light Chain Variable Domain of SEQ ID NO:114 and the Heavy Chain Variable Domain of SEQ ID NO:115; the Light Chain Variable Domain of SEQ ID NO:116 and the Heavy Chain Variable Domain of SEQ ID NO:117; the Light Chain Variable Domain of SEQ ID NO:118 and the Heavy Chain Variable Domain of SEQ ID NO:119; the Light Chain Variable Domain of SEQ ID NO:120 and the Heavy Chain Variable Domain of SEQ ID NO:121; the Light Chain Variable Domain of SEQ ID NO:122 and the Heavy Chain Variable Domain of SEQ ID NO:123; the Light Chain Variable Domain of SEQ ID NO:124 and the Heavy Chain Variable Domain of SEQ ID NO:125; the Light Chain Variable Domain of SEQ ID NO:126 and the Heavy Chain Variable Domain of SEQ ID NO:127; the Light Chain Variable Domain of SEQ ID NO:128 and the Heavy Chain Variable Domain of SEQ ID NO:129; the Light Chain Variable Domain of SEQ ID NO:130 and the Heavy Chain Variable Domain of SEQ ID NO:131; the Light Chain Variable Domain of SEQ ID NO:132 and the Heavy Chain Variable Domain of SEQ ID NO:133; the Light Chain Variable Domain of SEQ ID NO:134 and the Heavy Chain Variable Domain of SEQ ID NO:135; or the Light Chain Variable Domain of SEQ ID NO:136 and the Heavy Chain Variable Domain of SEQ ID NO:137.

11. The Tri-Specific Binding Molecule of claim 8, wherein the first Cancer Antigen and the second Cancer Antigen are independently selected from: colon cancer antigen 19.9; a gastric cancer mucin; antigen 4.2; glycoprotein A33 (gpA33); ADAM-9; gastric cancer antigen AH6; ALCAM; malignant human lymphocyte antigen APO-1; cancer antigen B1; B7-H3; beta-catenin; blood group ALe.sup.b/Le.sup.y; Burkitt's lymphoma antigen-38.13, colonic adenocarcinoma antigen C14; ovarian carcinoma antigen CA125; Carboxypeptidase M; CD5; CD19; CD20; CD22; CD23; CD25; CD27; CD28; CD30; CD33; CD36; CD45; CD46; CD52; CD79a/CD79b; CD103; CD317; CDK4; carcinoembryonic antigen (CEA); CEACAM5; CEACAM6; C017-1A; CO-43 (blood group Le.sup.b); CO-514 (blood group Le.sup.a); CTA-1; CTLA4; Cytokeratin 8; antigen D1.1; antigen D.sub.156-22; DR5; E.sub.1 series (blood group B); EGFR (Epidermal Growth Factor Receptor); Ephrin receptor A2 (EphA2); ErbB1; ErbB3; ErbB4; GAGE-1; GAGE-2; GD2/GD3/GM2; lung adenocarcinoma antigen F3; antigen FC10.2; G49, ganglioside GD2; ganglioside GD3; ganglioside GM2; ganglioside GM3; G.sub.D2; G.sub.D3; GICA 19-9; GM2; gp100; human leukemia T cell antigen Gp37; melanoma antigen gp75; gpA33; HER2 antigen (p185.sup.HER2); human milk fat globule antigen (HMFG); human papillomavirus-E6/human papillomavirus-E7; high molecular weight melanoma antigen (HMW-MAA); I antigen (differentiation antigen) I(Ma); Integrin Alpha-V-Beta-6 Integrinβ6 (ITGB6); Interleukin-13; Receptor α2 (IL13Rα2); JAM-3; KID3; KID31; KS 1/4 pan-carcinoma antigen; human lung carcinoma antigens L6 and L20; LEA; LUCA-2; M1:22:25:8; M18; M39; MAGE-1; MAGE-3; MART; MUC-1; MUM-1; Myl; N-acetylglucosam inyltransferase; neoglycoprotein; NS-10; OFA-1; OFA-2; Oncostatin M; p15; melanoma-associated antigen p97; polymorphic epithelial mucin (PEM); polymorphic epithelial mucin antigen (PEMA); PIPA; prostate-specific antigen (PSA); prostate-specific membrane antigen (PSMA); prostatic acid phosphate; R.sub.24, ROR1; sphingolipids; SSEA-1; SSEA-3; SSEA-4; sTn; T cell receptor derived peptide; T.sub.5A.sub.7; TAG-72; TL5 (blood group A); TNF-α receptor; TNF-β receptor; TNF-γ receptor; TRA-1-85 (blood group H); Transferrin Receptor; tumor-specific transplantation antigen (TSTA), oncofetal antigen-alpha-fetoprotein (AFP); VEGF, VEGFR; VEP8; VEP9; VIM-D5; and Y hapten, Le.sup.y.

12. The Tri-Specific Binding Molecule of claim 11, wherein one of Epitope I, Epitope II or Epitope III is an epitope of a Cancer Antigen and the Antigen-Binding Domain that immunospecifically binds to the epitope comprises: the six CDRs of SEQ ID NO: 3 and 8; 13 and 18; 23 and 31; 25 and 31; 27 and 31; 29 and 31; 54 and 58; 62 and 66; 70 and 74; 78 and 82; 86 and 90; 94 and 98; 153 and 158; 163 and 167; 172 and 177; 181 and 186; 191 and 192; 193 and 194; 195 and 196; 197 and 198; 199 and 200; 201 and 202; 203 and 204; 205 and 206; 302 and 303; 304 and 305; 306 and 307; 308 and 309; 310 and 311; 312 and 313; 314 and 315; or 321 and 322; or the Light Chain Variable Domain of SEQ ID NO:3 and the Heavy Chain Variable Domain of SEQ ID NO:8; the Light Chain Variable Domain of SEQ ID NO:13 and the Heavy Chain Variable Domain of SEQ ID NO:18; the Light Chain Variable Domain of SEQ ID NO:23 and the Heavy Chain Variable Domain of SEQ ID NO:31; the Light Chain Variable Domain of SEQ ID NO:25 and the Heavy Chain Variable Domain of SEQ ID NO:31; the Light Chain Variable Domain of SEQ ID NO:27 and the Heavy Chain Variable Domain of SEQ ID NO:31; the Light Chain Variable Domain of SEQ ID NO:29 and the Heavy Chain Variable Domain of SEQ ID NO:31; the Light Chain Variable Domain of SEQ ID NO:54 and the Heavy Chain Variable Domain of SEQ ID NO:58; the Light Chain Variable Domain of SEQ ID NO:62 and the Heavy Chain Variable Domain of SEQ ID NO:66; the Light Chain Variable Domain of SEQ ID NO:70 and the Heavy Chain Variable Domain of SEQ ID NO:74; the Light Chain Variable Domain of SEQ ID NO:78 and the Heavy Chain Variable Domain of SEQ ID NO:82; the Light Chain Variable Domain of SEQ ID NO:86 and the Heavy Chain Variable Domain of SEQ ID NO:90; the Light Chain Variable Domain of SEQ ID NO:94 and the Heavy Chain Variable Domain of SEQ ID NO:98; the Light Chain Variable Domain of SEQ ID NO:153 and the Heavy Chain Variable Domain of SEQ ID NO:158; the Light Chain Variable Domain of SEQ ID NO:163 and the Heavy Chain Variable Domain of SEQ ID NO:167; the Light Chain Variable Domain of SEQ ID NO:172 and the Heavy Chain Variable Domain of SEQ ID NO:177; the Light Chain Variable Domain of SEQ ID NO:181 and the Heavy Chain Variable Domain of SEQ ID NO:186; the Light Chain Variable Domain of SEQ ID NO:191 and the Heavy Chain Variable Domain of SEQ ID NO:192; the Light Chain Variable Domain of SEQ ID NO:193 and the Heavy Chain Variable Domain of SEQ ID NO:194; the Light Chain Variable Domain of SEQ ID NO:195 and the Heavy Chain Variable Domain of SEQ ID NO:196; the Light Chain Variable Domain of SEQ ID NO:197 and the Heavy Chain Variable Domain of SEQ ID NO:198; the Light Chain Variable Domain of SEQ ID NO:199 and the Heavy Chain Variable Domain of SEQ ID NO:200; the Light Chain Variable Domain of SEQ ID NO:201 and the Heavy Chain Variable Domain of SEQ ID NO:202; the Light Chain Variable Domain of SEQ ID NO:203 and the Heavy Chain Variable Domain of SEQ ID NO:204; the Light Chain Variable Domain of SEQ ID NO:205 and the Heavy Chain Variable Domain of SEQ ID NO:206; the Light Chain Variable Domain of SEQ ID NO:302 and the Heavy Chain Variable Domain of SEQ ID NO:303; the Light Chain Variable Domain of SEQ ID NO:304 and the Heavy Chain Variable Domain of SEQ ID NO:305; the Light Chain Variable Domain of SEQ ID NO:306 and the Heavy Chain Variable Domain of SEQ ID NO:307; the Light Chain Variable Domain of SEQ ID NO:308 and the Heavy Chain Variable Domain of SEQ ID NO:309; the Light Chain Variable Domain of SEQ ID NO:310 and the Heavy Chain Variable Domain of SEQ ID NO:311; the Light Chain Variable Domain of SEQ ID NO:312 and the Heavy Chain Variable Domain of SEQ ID NO:313; the Light Chain Variable Domain of SEQ ID NO:314 and the Heavy Chain Variable Domain of SEQ ID NO:315; or the Light Chain Variable Domain of SEQ ID NO:321 and the Heavy Chain Variable Domain of SEQ ID NO:322.

13. A pharmaceutical composition comprising the Tri-Specific Binding Molecule of claim 1, and a pharmaceutically acceptable carrier, excipient or diluent.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIGS. 1A-1B show diagrammatic representation of the Domains of DART™ diabodies. FIG. 1A shows a diagrammatic representation of the Domains of a basic DART™ diabody. FIG. 1B provides a schematic of a covalently bonded diabody composed of two polypeptide chains, each having a Heterodimer-Promoting Domain VL and VH domains that recognize the same epitope are shown using the same shading.

(2) FIGS. 2A-2B provide a schematic of covalently bonded diabodies composed of two polypeptide chains, each having a CH2 and CH3 Domain (FIG. 2A) or in which only one has a CH2 and CH3 Domain (FIG. 2B), such that the associated chains form an Fc Domain that comprises all or part of a naturally occurring Fc Domain. VL and VH domains that recognize the same epitope are shown using the same shading.

(3) FIGS. 3A-3C provide schematics showing tetravalent diabodies composed of two pairs of polypeptide chains. The pairs are different, thus resulting in a bi-specific molecule that is bivalent with respect to each of two epitopes, in which one is an epitope of DR5 and the other is an epitope of a molecule present on the surface of an effector cell. One polypeptide of each pair possesses a CH2 and CH3 Domain, such that the associated chains form an Fc Domain that comprises all or part of a naturally occurring Fc Domain. VL and VH domains that recognize the same epitope are shown using the same shading. Only one pair of epitopes (shown with the same shading) is capable of binding to DR5. FIG. 3A shows an Ig diabody. FIG. 3B shows an Ig diabody, which contains E-coil and K-coil heterodimer-promoting domains. FIG. 3C, shows an Fc-DART™ diabody that contains antibody CH1 and CL domains. The notation “VL1” and “VH1” denote respectively, the Variable Light Chain Domain and Variable Heavy Chain Domain that bind the “first” epitope. Similarly, the notation “VL2” and “VH2” denote respectively, the Variable Light Chain Domain and Variable Heavy Chain Domain that bind the “second” epitope.

(4) FIGS. 4A-4G provide a diagrammatic representation of the Domains of preferred Tri-Specific Binding Molecules of the present invention. The Figures illustrate schematically the order and orientation of the Domains of embodiments of the preferred Tri-Specific Binding Molecules of the present invention. FIGS. 4A, 4B and 4G illustrate embodiments in which the Tri-Specific Binding Molecule is composed of four polypeptide chains. FIGS. 4C, 4D, 4E and 4F illustrate embodiments in which the binding molecule is composed of three polypeptide chains. The molecule may possess Hinge and/or CL domains (FIGS. 4A, 4B, 4C, 4E) or may contain an alternative linker peptide (FIG. 4D, 4F, 4G).

(5) FIGS. 5A-5E provide a diagrammatic representation of the Domains of an alternative embodiment of the Tri-Specific Binding Molecules of the present invention, in which the Effector Cell-Binding Domain is composed of an Effector Cell Receptor-Type Binding Domai rather than a Diabody-Type Binding Domain or a Fab-Type Binding Domain. FIGS. 5A and 5B illustrate embodiments in which the Tri-Specific Binding Molecule is composed of four polypeptide chains. FIG. 5C and FIG. 5E illustrate an embodiment in which the binding molecule is composed of three polypeptide chains. FIG. 5D illustrates an embodiment in which the binding molecule is composed of five polypeptide chains. The molecule may possess Hinge and/or CL domains or may contain alternative linker peptides.

(6) FIG. 6 shows the ability of anti-human DR5 monoclonal antibodies DR5 mAb 1 and DR5 mAb 2 to bind to human DR5 and to the DR5 of cynomolgus monkey.

(7) FIG. 7, Panels A-H, show the kinetics of binding of DR5 mAb 1 (Panels A and E), DR5 mAb 2 (Panels B and F), DR5 mAb 3 (Panels C and G) and DR5 mAb 4 (Panels D and H) for human DR 5 (Panels A-D) and for cynomolgus monkey DR5 (Panels E-H).

(8) FIG. 8 shows the unexpected superiority of DR5 mAb 1 and DR5 mAb 2. Superiority was assessed by comparing the ability of DR5×CD3 diabodies having the VL and VH Domains of DR5 mAb 1, DR5 mAb 2, DR5 mAb 3, or DR5 mAb 4, to mediate the cytotoxicity of A549 adenocarcinomic human alveolar basal epithelial tumor cells.

(9) FIGS. 9A-9C demonstrate the synergistic enhancement in target cell binding that is attained when both of the two Cancer Antigen-Binding Domains of a Tri-Specific Binding Molecule of the present invention are able to bind to a target cell. FIG. 9A shows the binding obtained when trispecific molecules: EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1; EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1; and gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1 are incubated in the presence of EphA2-expressing CHO cells. FIG. 9B shows the binding obtained when such trispecific molecules are incubated in the presence of DR5-expressing CHO cells. FIG. 9C shows the binding obtained when such trispecific molecules are incubated in the presence of DU145 human prostate cells that express EphA2 and DR5, but not gpA33.

(10) FIGS. 10A-10C demonstrate the synergistic enhancement in target cell cytotoxicity that is attained when both of the two Cancer Antigen-Binding Domains of a Tri-Specific Binding Molecule of the present invention are able to bind to a target cell. FIG. 10A shows the percent cytotoxicity obtained by incubating trispecific molecules: EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1; EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1; and gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1 are incubated in the presence of EphA2-expressing CHO cells and cytotoxic lymphocytes. FIG. 10B shows the percent cytotoxicity obtained when such trispecific molecules are incubated in the presence of DR5-expressing CHO cells and cytotoxic lymphocytes. FIG. 10C shows the cytotoxicity obtained when such trispecific molecules are incubated in the presence of DU145 human prostate cells and cytotoxic lymphocytes. DU145 cells express EphA2 and DR5, but not gpA33. Cytotoxicity was measured by the increase in luminescence caused by the release of luciferase upon cell lysis.

DETAILED DESCRIPTION OF THE INVENTION

(11) The present invention relates to Tri-Specific Binding Molecules, which are multi-chain polypeptide molecules that possess three Binding Domains and are thus capable of mediating coordinated binding to three epitopes. The Tri-Specific Binding Molecule is preferably characterized in possessing binding domains that permit it to immunospecifically bind to: (1) an epitope of a first Cancer Antigen, (2) an epitope of a second Cancer Antigen, and (3) an epitope of a molecule that is expressed on the surface of an immune system effector cell, and are thus capable of localizing an immune system effector cell to a cell that expresses a Cancer Antigen, so as to thereby facilitate the killing of such cancer cell.

(12) The Tri-Specific Binding Molecules of the present invention may include Epitope-Binding Domains of humanized, chimeric or caninized derivatives of the above-discussed antibodies, for example, DR5 mAb 1 or DR5 mAb 2.

I. General Techniques and General Definitions

(13) The practice of the present invention will employ, unless otherwise indicated, conventional techniques of molecular biology (including recombinant techniques), microbiology, cell biology, biochemistry and immunology, which are within the skill of the art. Such techniques are explained fully in the literature, such as, MOLECULAR CLONING: A LABORATORY MANUAL, Third Edition (Sambrook et al. Eds., 2001) Cold Spring Harbor Press, Cold Spring Harbor, N.Y.; OLIGONUCLEOTIDE SYNTHESIS: METHODS AND APPLICATIONS (Methods in Molecular Biology), Herdewijn, P., Ed., Humana Press, Totowa, N.J.; OLIGONUCLEOTIDE SYNTHESIS (Gait, M. J., Ed., 1984); METHODS IN MOLECULAR BIOLOGY, Humana Press, Totowa, N.J.; CELL BIOLOGY: A LABORATORY NOTEBOOK (Cellis, J. E., Ed., 1998) Academic Press, New York, N.Y.; ANIMAL CELL CULTURE (Freshney, R. I., Ed., 1987); INTRODUCTION TO CELL AND TISSUE CULTURE (Mather, J. P. and Roberts, P. E., Eds., 1998) Plenum Press, New York, N.Y.; CELL AND TISSUE CULTURE: LABORATORY PROCEDURES (Doyle, A. et al., Eds., 1993-8) John Wiley and Sons, Hoboken, N.J.; METHODS IN ENZYMOLOGY (Academic Press, Inc.) New York, N.Y.; WEIR'S HANDBOOK OF EXPERIMENTAL IMMUNOLOGY (Herzenberg, L. A. et al. Eds. 1997) Wiley-Blackwell Publishers, New York, N.Y.; GENE TRANSFER VECTORS FOR MAMMALIAN CELLS (Miller, J. M. et al. Eds., 1987) Cold Spring Harbor Press, Cold Spring Harbor, N.Y.; CURRENT PROTOCOLS IN MOLECULAR BIOLOGY (Ausubel, F. M. et al., Eds., 1987) Greene Pub. Associates, New York, N.Y.; PCR: THE POLYMERASE CHAIN REACTION, (Mullis, K. et al., Eds., 1994) Birkhauser, Boston Mass.; CURRENT PROTOCOLS IN IMMUNOLOGY (Coligan, J. E. et al., eds., 1991) John Wiley and Sons, Hoboken, N.J.; SHORT PROTOCOLS IN MOLECULAR BIOLOGY (John Wiley and Sons, 1999) Hoboken, N.J.; IMMUNOBIOLOGY 7 (Janeway, C. A. et al. 2007) Garland Science, London, UK; Antibodies (P. Finch, 1997) Stride Publications, Devoran, UK; ANTIBODIES: A PRACTICAL APPROACH (D. Catty., ed., 1989) Oxford University Press, USA, New York N.Y.); MONOCLONAL ANTIBODIES: A PRACTICAL APPROACH (Shepherd, P. et al. Eds., 2000) Oxford University Press, USA, New York N.Y.; USING ANTIBODIES: A LABORATORY MANUAL (Harlow, E. et al. Eds., 1998) Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y.; THE ANTIBODIES (Zanetti, M. et al. Eds. 1995) Harwood Academic Publishers, London, UK); and DEVITA, HELLMAN, AND ROSENBERG'S CANCER: PRINCIPLES & PRACTICE OF ONCOLOGY, EIGHTH EDITION, DeVita, V. et al. Eds. 2008, Lippincott Williams & Wilkins, Philadelphia, Pa.

II. Preferred Tri-Specific Binding Molecules of the Present Invention

A. Binding Capabilities

(14) The preferred Tri-Specific Binding Molecules of the present invention are able to coordinately and simultaneously bind to three different epitopes. The preferred Tri-Specific Binding Molecules of the present invention comprise: (I) a “Binding Domain I” that is capable of immunospecifically binding to an “Epitope I” present on a first antigen, and a “Binding Domain II” that is capable of immunospecifically binding to an “Epitope II” present on a second antigen, wherein said Binding Domain I and said Binding Domain II are both “Diabody-Type Binding Domains;” (II) a “Binding Domain III” that is capable of immunospecifically binding to an “Epitope III” present on a third antigen; and (III) an Fc Domain that is formed by the complexing of two CH2-CH3 Domains to one another;
wherein: (A) one of Epitope I, Epitope II or Epitope III is an epitope of a first “Cancer Antigen” Cancer Antigen; (B) a second of Epitope I, Epitope II or Epitope III is an epitope of a second Cancer Antigen; and (C) the third of Epitope I, Epitope II or Epitope III is an epitope of a molecule expressed on the surface of an immune system effector cell (“Effector Cell Antigen”);
and wherein the Binding Domains I, II and III of the binding molecules mediate coordinated binding of the immune system effector cell and a cell expressing both the first and second Cancer Antigens to thereby co-localize such cells.

(15) Diabody Epitope-Binding Domains may also be directed to a surface determinant of a B cell, such as CD19, CD20, CD22, CD30, CD37, CD40, and CD74 (Moore, P. A. et al. (2011) “Application Of Dual Affinity Retargeting Molecules To Achieve Optimal Redirected T-Cell Killing Of B-Cell Lymphoma,” Blood 117(17):4542-4551; Cheson, B. D. et al. (2008) “Monoclonal Antibody Therapy For B-Cell Non Hodgkin's Lymphoma,” N. Engl. J. Med. 359(6):613-626; Castillo, J. et al. (2008) “Newer monoclonal antibodies for hematological malignancies,” Exp. Hematol. 36(7):755-768. In many studies, diabody binding to effector cell determinants, e.g., Fcγ receptors (FcγR), was also found to activate the effector cell (Holliger et al. (1996) “Specific Killing Of Lymphoma Cells By Cytotoxic T-Cells Mediated By A Bi-specific Diabody,” Protein Eng. 9:299-305; Holliger et al. (1999) “Carcinoembryonic Antigen (CEA)-Specific T-Cell Activation In Colon Carcinoma Induced By Anti-CD3×Anti-CEA Bi-specific Diabodies And B7×Anti-CEA Bi-specific Fusion Proteins,” Cancer Res. 59:2909-2916; WO 2006/113665; WO 2008/157379; WO 2010/080538; WO 2012/018687; WO 2012/162068). Normally, effector cell activation is triggered by the binding of an antigen bound antibody to an effector cell via Fc-FcγR interaction; thus, in this regard, diabody molecules may exhibit Ig-like functionality independent of whether they comprise an Fc Domain (e.g., as assayed in any effector function assay known in the art or exemplified herein (e.g., ADCC assay)). By cross-linking tumor and effector cells, the diabody not only brings the effector cell within the proximity of the tumor cells but leads to effective tumor killing (see e.g., Cao et al. (2003) “Bi-specific Antibody Conjugates In Therapeutics,” Adv. Drug. Deliv. Rev. 55:171-197).

(16) Although such Tri-Specific Binding Molecules are particularly preferred, the invention additionally specifically contemplates Tri-Specific Binding Molecules that comprise any combination of Binding Domains sufficient to produce a molecule having three binding specificities, of which two are binding specificities directed against Cancer Antigens, and one is a binding specificity directed against an Effector Cell Antigen. Thus, for example, the invention contemplates: a Tri-Specific Binding Molecule that comprises three Fab-Type Binding Domains, a Tri-Specific Binding Molecule that comprises one bivalent, bi-specific antibody domain (formed for example, by complexing two different light chains and two different heavy chains) and one Fab-Type Binding Domain, a Tri-Specific Binding Molecule that comprises two bivalent, bi-specific antibody domains (formed for example, by complexing four different light chains and two different heavy chains), but in which one of antibody domains has been rendered inactive, etc.

(17) The terms “polypeptide,” “polypeptide chain,” and “peptide” are used interchangeably herein to refer to polymers of amino acids of any length, but especially lengths greater than 3, 5, 10, 15, 20 or 25 amino acid residues, in which two, and more preferably all, amino acid residues are joined via an amide (peptide) bond (—NH—C(O)—). The polymer may however be linear or branched, it may comprise modified amino acids, and it may be interrupted by non-amino acids. The terms also encompass an amino acid polymer that has been modified naturally or by intervention; for example, disulfide bond formation, glycosylation, lipidation, acetylation, phosphorylation, or any other manipulation or modification, such as conjugation with a labeling component. Also included within the definition are, for example, polypeptides containing one or more analogs of an amino acid (including, for example, unnatural amino acids, etc.), as well as other modifications known in the art. The polypeptides of this invention can occur as single-chains or as complexed chains.

(18) A “Diabody-Type Binding Domain” is the Epitope-Binding Domain of a diabody, and especially, a DART® diabody. The terms “diabody” and “DART® diabody” has been discussed above, and refers to a molecule that comprises at least two polypeptide chains that preferably complex with one another through a covalent interaction to form at least two epitope binding sites, which may recognize the same or different epitopes. Two of the polypeptide chains of a diabody or DART® diabody each comprise immunoglobulin Light Chain Variable Region and an immunoglobulin Heavy Chain Variable Region, but these regions do not interact to form an epitope binding site (i.e., they are not mutually “complementary”). Rather, the immunoglobulin Heavy Chain Variable Region of one (e.g., the first) of the diabody, or DART® diabody, chains interacts with the immunoglobulin Light Chain Variable Region of a different (e.g., the second) diabody or, DART® diabody, polypeptide chain to form an epitope binding site. Similarly, the immunoglobulin Light Chain Variable Region of one (e.g., the first) of the diabody, or DART® diabody, polypeptide chains interacts with the immunoglobulin Heavy Chain Variable Region of a different (e.g., the second) diabody, or DART® diabody, polypeptide chain to form an epitope binding site. DART® diabody molecules are disclosed in United States Patent Publications No. 2013-0295121; 2010-0174053 and 2009-0060910; European Patent Publication No. EP 2714079; EP 2601216; EP 2376109; EP 2158221 and PCT Publications No. WO 2012/162068; WO 2012/018687; WO 2010/080538; WO 2006/113665, WO 2008/157379 and Moore, P. A. et al. (2011) “Application Of Dual Affinity Retargeting Molecules To Achieve Optimal Redirected T-Cell Killing Of B-Cell Lymphoma,” Blood 117(17):4542-4551; Veri, M. C. et al. (2010) “Therapeutic Control Of B Cell Activation Via Recruitment Of Fcgamma Receptor IIb (CD32B) Inhibitory Function With A Novel Bi-specific Antibody Scaffold,” Arthritis Rheum. 62(7):1933-1943; and Johnson, S. et al. (2010) “Effector Cell Recruitment With Novel Fv-Based Dual Affinity Re-Targeting Protein Leads To Potent Tumor Cytolysis And in vivo B-Cell Depletion,” J. Mol. Biol. 399(3):436-449.

(19) Binding Domain III is preferably a “Non-Diabody-Type” Binding Domain, which is intended to denote that Binding Domain III does not have the structure of a Diabody-Type Binding Domain. Preferably, Binding Domain III is a Non-Diabody-Type Binding Domain that is a Fab-Type Binding Domain or an Effector Cell Receptor-Type Binding Domain. Thus, in one embodiment, exemplified in FIGS. 4A-4G, the Binding Domain III is a Fab-Type Binding Domain. FIGS. 5A-5E exemplify the embodiment in which Binding Domain III is an Effector Cell Receptor-Type Binding Domain. As used herein, the term an “Fab-Type Binding Domain” refers to an epitope Binding Domain that is formed by the interaction of the VL Domain of an immunoglobulin light chain and a complementing VH Domain of an immunoglobulin heavy chain. Fab-Type Binding Domains differ from Diabody-Type Binding Domain in that the two polypeptide chains that form a Fab-Type Binding Domain comprise only a single epitope Binding Domain, whereas the two polypeptide chains that form a Diabody-Type Binding Domain comprise at least two epitope Binding Domains. Thus, as used herein Fab-Type Binding Domains are distinct from Diabody-Type Binding Domain. When a binding domain is a Fab-Type Binding Domain or a Diabody-Type Binding Domain, it will be composed of a VL Domain and a VH Domain, which may be located on the same or on different polypetide chains. The selection of such VL and VH domains is coordinated, such that the domains form an epitope binding domain. As used herein, the term “Effector Cell Receptor-Type Binding Domain” refers to an epitope binding domain that is formed by the interaction of a variable domain of a T Cell Receptor alpha chain and a variable domain of a T Cell Receptor beta chain. Such receptors recognize peptides displayed in the context of MHC and are thus capable of recognizing intracellular epitopes.

(20) The Tri-Specific Binding Molecules of the present invention are thus distinguished from tetravalent binding molecules, such as those produced from the dimerization of a bivalent antibody, and preferably possess three and not four Binding Domains. As discussed below, the trispecific molecules of the present invention may possess additional binding domains (such as an Albumin-Binding Domain, an FcγR-Binding Domain, etc.). Such additional Binding Domains are not intended to be considered or counted as being one of the three Binding Domains of the Tri-Specific Binding Molecules of the present invention.

(21) As used herein, the terms “association” or “associating,” with regard to polypeptides (e.g., one diabody polypeptide to another, an immunoglobulin light chain to an immunoglobulin heavy chain, one CH2-CH3 Domain to another CH2-CH3 Domain, etc.) is intended to denote a non-covalent combining of the polypeptides. The terms “complexes” or “complexing” are intended to denote a covalent combining of the polypeptides.

(22) As used herein, Binding Domains of a Binding Molecule of the invention is said to mediate “coordinated binding” if at least two of its Binding Domains and preferably all of its Binding Domains, are capable of concurrently being bound to their respective recognized epitopes or binding ligand. Such binding may be simultaneous. However, one aspect of the present invention relates to modifying the “on” and/or “off” rates with which such Binding Domains bind to their recognized epitopes. As used here, the “on rate” of binding is a measure of the affinity with which such Binding Domains recognize and initiate binding to their recognized epitopes. In contrast, the “off rate” of binding is a measure of the degree of stability of the Binding Domain:epitope complex. The “on” and/or “off” rates of binding can be modified by altering the amino acid sequence of the CDRs of a Binding Domain. As discussed below, independent of any CDR modifications, the extent of coordinated binding of the molecules of the present invention may be modulated by changing the configuration of the their Binding Domains so that a particular Binding Domain (i.e., a VLx/VHx Domain) is present as Binding Domain III or as an internal or external Diabody-Type Binding Domain relative to Binding Domain III (discussed in detail below).

(23) The on- and off-rates of the Binding Domains of the Binding Molecules of the present invention can be readily measured by methods well-known in the art, for example by BIACORE® analysis (Jason-Moller, L. et al. (2006) “Overview Of Biacore Systems And Their Applications,” Curr. Protoc. Protein Sci. Chapter 19:Unit 19.13; Swanson, S. J. (2005) “Characterization Of An Immune Response,” Dev. Biol. (Basel). 122:95-101; Buijs, J. et al. (2005) “SPR-MS In Functional Proteomics,” Brief Funct. Genomic Proteomic. 4(1):39-47; Karlsson, R. et al. (2004) “SPR For Molecular Interaction Analysis: A Review Of Emerging Application Areas,” J. Mol. Recognit. 17(3):151-161; Van Regenmortel, M. H. (2003) “Improving The Quality Of BIACORE-Based Affinity Measurements,” Dev. Biol. (Basel) 112:141-151; Malmqvist, M. (1999) “BIACORE: An Affinity Biosensor System For Characterization Of Biomolecular Interactions,” Biochem. Soc. Trans. 27(2):335-340; Malmqvist, M. et al. (1997) “Biomolecular Interaction Analysis: Affinity Biosensor Technologies For Functional Analysis Of Proteins,” Curr. Opin. Chem. Biol. 1(3):378-383; Fivash, M. et al. (1998) “Biacore For Macromolecular Interaction,” Curr. Opin. Biotechnol. 9(1):97-101; Malmborg, A. C. et al. (1995) “Biacore As A Tool In Antibody Engineering,” J. Immunol. Methods. 183(1):7-13). The on- and off-rates of the Binding Domains of the Binding Molecules of the present invention can be readily altered by random or directed mutagenesis of nucleic acid molecules that encode such Binding Domains, followed by the routine screening of recovered nucleic acid molecules for their ability to encode mutated proteins that exhibit such altered binding kinetics.

(24) The Binding Domains of the Tri-Specific Binding Molecules of the present invention bind to epitopes in an “immunospecific” manner. As used herein, an antibody, diabody or other epitope binding molecule is said to “immunospecifically” bind a region of another molecule (i.e., an epitope) if it reacts or associates more frequently, more rapidly, with greater duration and/or with greater affinity with that epitope relative to alternative epitopes. For example, an antibody that immunospecifically binds to a viral epitope is an antibody that binds this viral epitope with greater affinity, avidity, more readily, and/or with greater duration than it immunospecifically binds to other viral epitopes or non-viral epitopes. It is also understood by reading this definition that, for example, an antibody (or moiety or epitope) that immunospecifically binds to a first target may or may not specifically or preferentially bind to a second target. As such, “specific binding” does not necessarily require (although it can include) exclusive binding. Generally, but not necessarily, reference to binding means “specific” binding. Two molecules are said to be capable of binding to one another in a “physiospecific” manner, if such binding exhibits the specificity with which receptors bind to their respective ligands.

(25) The functionality of antibodies can be enhanced by generating multispecific antibody-based molecules that can simultaneously bind two separate and distinct antigens (or different epitopes of the same antigen) and/or by generating antibody-based molecule having higher valency (i.e., more than two binding sites) for the same epitope and/or antigen.

(26) Thus, in their simplest embodiment, the preferred binding molecules of the present invention are at least trispecific. Significantly, such molecules have at least three Sites that are capable of binding antigen: an “external” Diabody-Type Binding Domain that is located furthest from Binding Domain III, an “internal” Diabody-Type Binding Domain that is located nearest to Binding Domain III, and Binding Domain III itself. The positions of such Domains are respectively designated as “Site A,” Site B″ and “Site C” (FIGS. 4A-4G; FIGS. 5A-5E).

(27) The Tri-Specific Binding Molecules of the present invention are able to coordinately bind to three different epitopes by comprising three binding domains. Two of the binding domains of such molecules are capable of binding to epitopes of “Cancer Antigens,” such that the molecule is capable of binding to two different Cancer Antigens. The third binding domain of such molecules is capable of binding to an epitope of a molecule expressed on the surface of an immune system effector cell (i.e., an “Effector Cell Antigen”). Thus, the Tri-Specific Binding Molecules of the present invention are able to mediate coordinated and simultaneous binding to a cancer cell expressing two Cancer Antigens and to an immune system effector cell expressing the Effector Cell Antigen. The epitopes recognized by the Tri-Specific Binding Molecules of the present invention may be continuous or discontinuous (e.g., conformational).

(28) The first and second Cancer Antigens that are bound by the Cancer Antigen-Binding Domains of the trispecific binding molecules of the present invention may be selected from any molecule that is characteristically present on the surface of a cancer cell. One aspect of the present invention relates to the ability to target “Low Expression Cancer Antigens” (i.e., a Cancer Antigen that may be expressed on a cancer cell at a level too low to permit a monospecific binding molecule to provide an effective cancer therapy). In contrast to such monospecific binding molecules, the Tri-Specific Binding Molecules of the present invention, by targeting two Cancer Antigens instead of one, exhibit synergistic and cooperative enhanced binding avidity that may compensate for low affinity of binding and thus may be advantageously used to target cancers characterized even by a Low Expression Cancer Antigen. A second aspect of the present invention relates to the ability to target “Low Specificity Cancer Antigens” (i.e., a Cancer Antigen that may be expressed on a normal cell in addition to being expressed on a cancer cell). The Tri-Specific Binding Molecules of the present invention, by providing synergistic and cooperative enhanced binding avidity to two Cancer Antigens, exhibits higher avidity of binding even for Low Specificity Cancer Antigens and thus provides a means for treating cancers that are characterized by such Cancer Antigens. Thus, the Tri-Specific Binding Molecules of the present invention may be used to impart an anti-cancer therapy even in circumstances where one or both of the target Cancer Antigens is ineffective on its own to provide such therapy.

(29) For example, CD32B (the FcγRIIB receptor) is widely expressed on hematopoietic cells, including monocytes, macrophages, B cells, NK cells, neutrophils, mast cells, and platelets. Upon binding to IgG Fc Domain, CD32B inhibits the host immune system to thereby depress an ongoing immune response. Although such inhibition is desirable in helping the host recover from inflammatory reactions, it serves to exacerbate the immune deficiencies of subjects suffering from cancer or infectious disease. Antibodies that bind to CD32B, so as to block the binding of IgG Fc molecules, serve to prevent such inhibition and thus have utility as adjunct molecules in the treatment of cancer and infectious disease (Veri, M. C. et al. (2007) “Monoclonal Antibodies Capable Of Discriminating The Human Inhibitory Fcgamma-Receptor IIB (CD32B) From The Activating Fcgamma-Receptor HA (CD32A): Biochemical, Biological And Functional Characterization,” Immunology 121 (3): 392-404). Unfortunately, CD32B is also expressed on liver sinusoidal endothelial cells (“LSE cells”) (Shahani, T. et al. (2014) “Human Liver Sinusoidal Endothelial Cells But Not Hepatocytes Contain Factor VIII,” J. Thromb. Haemost. 12(1):36-42; Géraud, C. et al. (2013) “Endothelial Transdifferentiation In Hepatocellular Carcinoma: Loss Of Stabilin-2 Expression In Peri-Tumourous Liver Correlates With Increased Survival,” Liver Int. 33(9):1428-1440; Takabe, Y. et al. (2012) “Immunomagnetic Exclusion Of E-Cadherin-Positive Hepatoblasts In Fetal Mouse Liver Cell Cultures Impairs Morphogenesis And Gene Expression Of Sinusoidal Endothelial Cells,” J. Anat. 221(3):229-239). Thus, antibodies that bind CD32B attack LSE cells. However, by forming a Tri-Specific Binding Molecule of the present invention that binds to CD32B and to antigens (i.e., the first and second Cancer Antigens) that are not expressed on LSE cells, or are expressed at low levels by such cells (i.e., Low Expression Cancer Antigen(s)), or are expressed with low specificity on cancer cells and such LSE cells (i.e., Low Specificity Cancer Antigen(s)), the present invention provides compositions and methods that would be used to depress CD32B-mediated immune system inhibition.

B. Exemplary Cancer Antigen-Binding Domains

(30) Examples of suitable Cancer Antigens include: 19.9 as found in colon cancer, gastric cancer mucins; 4.2; A33 (a colorectal carcinoma antigen; Almqvist, Y. 2006, Nucl Med Biol. November; 33(8):991-998); ADAM-9 (United States Patent Publication No. 2006/0172350; PCT Publication No. WO 06/084075); AH6 as found in gastric cancer; ALCAM (PCT Publication No. WO 03/093443); APO-1 (malignant human lymphocyte antigen) (Trauth et al. (1989) “Monoclonal Antibody-Mediated Tumor Regression By Induction Of Apoptosis,” Science 245:301-304); B1 (Egloff, A. M. et al. 2006, Cancer Res. 66(1):6-9); BAGE (Bodey, B. 2002 Expert Opin Biol Ther. 2(6):577-84); B7-H3; beta-catenin (Prange W. et al. 2003 J Pathol. 201(2):250-9); blood group ALe.sup.b/Le.sup.y as found in colonic adenocarcinoma; Burkitt's lymphoma antigen-38.13, C14 as found in colonic adenocarcinoma; CA125 (ovarian carcinoma antigen) (Bast, R. C. Jr. et al. 2005 Int J Gynecol Cancer 15 Suppl 3:274-81; Yu et al. (1991) “Coexpression Of Different Antigenic Markers On Moieties That Bear CA 125 Determinants,” Cancer Res. 51(2):468-475); Carboxypeptidase M (United States Patent Publication No. 2006/0166291); CD5 (Calin, G. A. et al. 2006 Semin Oncol. 33(2):167-73; CD19 (Ghetie et al. (1994) “Anti-CD19 Inhibits The Growth Of Human B-Cell Tumor Lines In Vitro And Of Daudi Cells In SCID Mice By Inducing Cell Cycle Arrest,” Blood 83:1329-1336; Troussard, X. et al. 1998 Hematol Cell Ther. 40(4):139-48); CD20 (Thomas, D. A. et al. 2006 Hematol Oncol Clin North Am. 20(5):1125-36); CD22 (Kreitman, R. J. 2006 AAPS J. 18; 8(3):E532-51); CD23 (Rosati, S. et al. 2005 Curr Top Microbiol Immunol. 5; 294:91-107); CD25 (Troussard, X. et al. 1998 Hematol Cell Ther. 40(4):139-48); CD27 (Bataille, R. 2006 Haematologica 91(9):1234-40); CD28 (Bataille, R. 2006 Haematologica 91(9):1234-40); CD33 (Sgouros et al. (1993) “Modeling And Dosimetry Of Monoclonal Antibody M195 (Anti-CD33) In Acute Myelogenous Leukemia,” J. Nucl. Med. 34:422-430); CD36 (Ge, Y. 2005 Lab Hematol. 11(1):31-7); CD40/CD154 (Messmer, D. et al. 2005 Ann N Y Acad Sci. 1062:51-60); CD45 (Jurcic, J. G. 2005 Curr Oncol Rep. 7(5):339-46); CD56 (Bataille, R. 2006 Haematologica 91(9):1234-40); CD46 (U.S. Pat. No. 7,148,038; PCT Publication No. WO 03/032814); CD79a/CD79b (Troussard, X. et al. 1998 Hematol Cell Ther. 40(4):139-48; Chu, P. G. et al. 2001 Appl Immunohistochem Mol Morphol. 9(2):97-106); CD103 (Troussard, X. et al. 1998 Hematol Cell Ther. 40(4):139-48); CDK4 (Lee, Y. M. et al. 2006 Cell Cycle 5(18):2110-4); CEA (carcinoembryonic antigen) (Foon et al. (1995) “Immune Response To The Carcinoembryonic Antigen In Patients Treated With An Anti-Idiotype Antibody Vaccine,” J. Clin. Invest. 96(1):334-42); CEA (carcinoembryonic antigen; Mathelin, C. 2006 Gynecol Obstet Fertil. 34(7-8):638-46; Tellez-Avila, F. I. et al. 2005 Rev Invest Clin. 57(6):814-9); C017-1A (Ragnhammar et al. (1993) “Effect Of Monoclonal Antibody 17-1A And GM-CSF In Patients With Advanced Colorectal Carcinoma—Long-Lasting, Complete Remissions Can Be Induced” Int. J. Cancer 53:751-758); CO-43 (blood group Le.sup.b); CO-514 (blood group Le.sup.a) as found in adenocarcinoma; CTA-1; CTLA4 (Peggs, K. S. et al. 2006 Curr Opin Immunol. 18(2):206-13); Cytokeratin 8 (PCT Publication No. WO 03/024191); D1.1; D.sub.156-22; DR5 (Abdulghani, J. et al. (2010) “TRAIL Receptor Signaling And Therapeutics,” Expert Opin. Ther. Targets 14(10):1091-1108; Andera, L. (2009) “Signaling Activated By The Death Receptors Of The TNFR Family,” Biomed. Pap. Med. Fac. Univ. Palacky Olomouc Czech. Repub. 153(3):173-180; Carlo-Stella, C. et al. (2007) “Targeting TRAIL Agonistic Receptors for Cancer Therapy,” Clin, Cancer 13(8):2313-2317; Chaudhari, B. R. et al. (2006) “Following the TRAIL to Apoptosis,” Immunologic Res. 35(3):249-262); E.sub.1 series (blood group B) as found in pancreatic cancer; EGFR (Epidermal Growth Factor Receptor) (Adenis, A. et al. 2003 Bull Cancer. 90 Spec No: S228-32); Ephrin receptors (and in particular EphA2 (U.S. Pat. No. 7,569,672; PCT Publication No. WO 06/084226); Erb (ErbB1; ErbB3; ErbB4; Zhou, H. et al. 2002 Oncogene 21(57):8732-8740; Rimon, E. et al. 2004 Int J Oncol. 24(5):1325-1338); GAGE (GAGE-1; GAGE-2; Akcakanat, A. et al. 2006 Int J Cancer. 118(1):123-128); GD2/GD3/GM2 (Livingston, P. O. et al. 2005 Cancer Immunol Immunother. 54(10):1018-1025); F3 as found in lung adenocarcinoma; FC10.2 as found in embryonal carcinoma cells and gastric adenocarcinoma; G49, ganglioside GD2 (Saleh et al. (1993) “Generation Of A Human Anti-Idiotypic Antibody That Mimics The GD2 Antigen,” J. Immunol., 151, 3390-3398); ganglioside GD3 (Shitara et al. (1993) “A Mouse/Human Chimeric Anti-(Ganglioside GD3) Antibody With Enhanced Antitumor Activities,” Cancer Immunol. Immunother. 36:373-380); ganglioside GM2 (Livingston et al. (1994) “Improved Survival In Stage III Melanoma Patients With GM2 Antibodies: A Randomized Trial Of Adjuvant Vaccination With GM2 Ganglioside,” J. Clin. Oncol. 12:1036-1044); ganglioside GM3 (Hoon et al. (1993) “Molecular Cloning Of A Human Monoclonal Antibody Reactive To Ganglioside GM3 Antigen On Human Cancers,” Cancer Res. 53:5244-5250); G.sub.D2; G.sub.D3; GICA 19-9 (Herlyn et al. (1982) “Monoclonal Antibody Detection Of A Circulating Tumor Associated Antigen. I. Presence Of Antigen In Sera Of Patients With Colorectal, Gastric, And Pancreatic Carcinoma,” J. Clin. Immunol. 2:135-140); G.sub.M2; gp100 (Lotem, M. et al. 2006 J Immunother. 29(6):616-27); Gp37 (human leukemia T cell antigen) (Bhattacharya-Chatterjee et al. (1988) “Idiotype Vaccines Against Human T Cell Leukemia. II. Generation And Characterization Of A Monoclonal Idiotype Cascade (Ab1, Ab2, and Ab3),” J. Immunol. 141:1398-1403); gp75 (melanoma antigen) (Vijayasardahl et al. (1990) “The Melanoma Antigen Gp75 Is The Human Homologue Of The Mouse B (Brown) Locus Gene Product,” J. Exp. Med. 171 (4): 1375-1380); gpA33; HER2 antigen (p185.sup.HER2) (Kumar, Pal S et al. 2006 Semin Oncol. 33(4):386-91); human B-lymphoma antigen-CD20 (Reff et al. (1994) “Depletion Of B Cells In Vivo By A Chimeric Mouse Human Monoclonal Antibody To CD20,” Blood 83:435-445); human milk fat globule antigen; human papillomavirus-E6/human papillomavirus-E7 (DiMaio, D. et al. 2006 Adv Virus Res. 66:125-59; HMW-MAA (high molecular weight melanoma antigen) (Natali et al. (1987) “Immunohistochemical Detection Of Antigen In Human Primary And Metastatic Melanomas By The Monoclonal Antibody 140.240 And Its Possible Prognostic Significance,” Cancer 59:55-63; Mittelman et al. (1990) “Active Specific Immunotherapy In Patients With Melanoma. A Clinical Trial With Mouse Antiidiotypic Monoclonal Antibodies Elicited With Syngeneic Anti-High-Molecular-Weight-Melanoma-Associated Antigen Monoclonal Antibodies,” J. Clin. Invest. 86:2136-2144); I antigen (differentiation antigen) (Feizi (1985) “Demonstration By Monoclonal Antibodies That Carbohydrate Structures Of Glycoproteins And Glycolipids Are Onco-Developmental Antigens,” Nature 314:53-57) such as I(Ma) as found in gastric adenocarcinomas; Integrin Alpha-V-Beta-6 (PCT Publication No. WO 03/087340); JAM-3 (PCT Publication No. WO 06/084078); KID3 (PCT Publication No. WO 05/028498); KID31 (PCT Publication No. WO 06/076584); KS 1/4 pan-carcinoma antigen (Perez et al. (1989) “Isolation And Characterization Of A cDNA Encoding The Ks1/4 Epithelial Carcinoma Marker,” J. Immunol. 142:3662-3667; Möller et al. (1991) “Bi-specific-Monoclonal-Antibody-Directed Lysis Of Ovarian Carcinoma Cells By Activated Human T Lymphocytes,” Cancer Immunol. Immunother. 33(4):210-216; Ragupathi, G. 2005 Cancer Treat Res. 123:157-80); L6 and L20 (human lung carcinoma antigens) (Hellström et al. (1986) “Monoclonal Mouse Antibodies Raised Against Human Lung Carcinoma,” Cancer Res. 46:3917-3923); LEA; LUCA-2 (United States Patent Publication No. 2006/0172349; PCT Publication No. WO 06/083852); M1:22:25:8; M18; M39; MAGE (MAGE-1; MAGE-3; (Bodey, B. 2002 Expert Opin Biol Ther. 2(6):577-84); MART (Kounalakis, N. et al. 2005 Curr Oncol Rep. 7(5):377-82; MUC-1 (Mathelin, C. 2006 Gynecol Obstet Fertil. 34(7-8):638-46); MUM-1 (Castelli, C. et al. 2000 J Cell Physiol. 182(3): 323-31); Myl; N-acetylglucosaminyltransferase (Dennis, J. W. 1999 Biochim Biophys Acta. 6; 1473(1):21-34); neoglycoprotein; NS-10 as found in adenocarcinomas; OFA-1; OFA-2; Oncostatin M (Oncostatin Receptor Beta) (U.S. Pat. No. 7,572,896; PCT Publication No. WO 06/084092); p15 (Gil, J. et al. 2006 Nat Rev Mol Cell Biol. 7(9):667-77); p97 (melanoma-associated antigen) (Estin et al. (1989) “Transfected Mouse Melanoma Lines That Express Various Levels Of Human Melanoma Associated Antigen p97,” J. Natl. Cancer Instit. 81(6):445-454); PEM (polymorphic epithelial mucin) (Hilkens et al. (1992) “Cell Membrane-Associated Mucins And Their Adhesion Modulating Property,” Trends in Biochem. Sci. 17:359-363); PEMA (polymorphic epithelial mucin antigen); PIPA (U.S. Pat. No. 7,405,061; PCT Publication No. WO 04/043239); PSA (prostate-specific antigen) (Henttu et al. (1989) “cDNA Coding For The Entire Human Prostate Specific Antigen Shows High Homologies To The Human Tissue Kallikrein Genes,” Biochem. Biophys. Res. Comm. 10(2):903-910; Israeli et al. (1993) “Molecular Cloning Of A Complementary DNA Encoding A Prostate-Specific Membrane Antigen,” Cancer Res. 53:227-230; Cracco, C. M. et al. 2005 Minerva Urol Nefrol. 57(4):301-11); PSMA (prostate-specific membrane antigen) (Ragupathi, G. 2005 Cancer Treat Res. 123:157-180); prostatic acid phosphate (Tailor et al. (1990) “Nucleotide Sequence Of Human Prostatic Acid Phosphatase Determined From A Full-Length cDNA Clone,” Nucl. Acids Res. 18(16):4928); R.sub.24 as found in melanoma; ROR1 (U.S. Pat. No. 5,843,749); sphingolipids; SSEA-1; SSEA-3; SSEA-4; sTn (Holmberg, L. A. 2001 Expert Opin Biol Ther. 1(5):881-91); T cell receptor derived peptide from a cutaneous T cell lymphoma (see Edelson (1998) “Cutaneous T-Cell Lymphoma: A Model For Selective Immunotherapy,” Cancer J Sci Am. 4:62-71); T.sub.5A.sub.7 found in myeloid cells; TAG-72 (Yokota et al. (1992) “Rapid Tumor Penetration Of A Single-Chain Fv And Comparison With Other Immunoglobulin Forms,” Cancer Res. 52:3402-3408); TL5 (blood group A); TNF-receptor (TNF-α receptor, TNF-β receptor; TNF-γ receptor (van Horssen, R. et al. 2006 Oncologist. 11(4):397-408; Gardnerova, M. et al. 2000 Curr Drug Targets. 1(4):327-64); TRA-1-85 (blood group H); Transferrin Receptor (U.S. Pat. No. 7,572,895; PCT Publication No. WO 05/121179); TSTA (tumor-specific transplantation antigen) such as virally-induced tumor antigens including T-antigen DNA tumor viruses and envelope antigens of RNA tumor viruses, oncofetal antigen-alpha-fetoprotein such as CEA of colon, bladder tumor oncofetal antigen (Hellstrom et al. (1985) “Monoclonal Antibodies To Cell Surface Antigens Shared By Chemically Induced Mouse Bladder Carcinomas,” Cancer. Res. 45:2210-2188); VEGF receptor (O'Dwyer. P. J. 2006 Oncologist. 11(9):992-998); VEP8; VEP9; VIM-D5; and Y hapten, Le as found in embryonal carcinoma cells.

(31) 1. Campath-1 (CD52) Binding Domain (Alemtuzumab)

(32) The amino acid sequence of the VL Domain of the humanized anti-CD52 antibody “Alemtuzumab” (SEQ ID NO:205) is shown below (CDR residues are shown underlined):

(33) TABLE-US-00002 DIQMTQSPSS LSASVGDRVT ITCKASQNID KYLNWYQQKP GKAPKLLIYN TNNLQTGVPS RFSGSGSGTD FTFTISSLQP EDIATYYCLQ HISRPRTFGQ GTKVEIKR

(34) The amino acid sequence of the VH Domain of the humanized anti-CD52 antibody “Alemtuzumab” (SEQ ID NO:206) is shown below (CDR residues are shown underlined):

(35) TABLE-US-00003 QVQLQESGPG LVRPSQTLSL TCTVSGFTFT DFYMNWVRQP PGRGLEWIGF IRDKAKGYTT EYNPSVKGRV TMLVDTSKNQ FSLRLSSVTA ADTAVYYCAR EGHTAAPFDY WGQGSLVTVS S

(36) 2. CD317 (BMST2)-Binding Domains

(37) CD317 (also known as Bone Marrow Stromal Cell Antigen 2; BMST) is overexpressed on various cancer cells isolated from breast, lung, kidney, endometrium, and skin (Kawai, S. et al. (2008) “Interferon-α enhances CD317 expression and the antitumor activity of anti-CD317 monoclonal antibody in renal cell carcinoma xenograft models,” Cancer Science 99(12):2461-2466; Cai, D. et al. (2009) “Up-Regulation Of Bone Marrow Stromal Protein 2 (BST2) In Breast Cancer With Bone Metastasis,” BMC Cancer 9:102, pp. 1-10; Wang, W. et al. (2009) HM1.24 (CD317) Is A Novel Target Against Lung Cancer For Immunotherapy Using Anti-HM1.24 Antibody,” Cancer Immunology, Immunotherapy 58(6):967-976; Wang, W. et al. (2009) “Chimeric And Humanized Anti-HM1.24 Antibodies Mediate Antibody-Dependent Cellular Cytotoxicity Against Lung Cancer Cells. Lung Cancer,” 63(1):23-31; Sayeed, A. et al. (2013) “Aberrant Regulation Of The BST2 (Tetherin) Promoter Enhances Cell Proliferation And Apoptosis Evasion In High Grade Breast Cancer Cells,” PLoS ONE 8(6)e67191, pp. 1-10; Yi, E. H. et al. (2013) “BST-2 Is A Potential Activator Of Invasion And Migration In Tamoxifen-Resistant Breast Cancer Cells,” Biochem. Biophys. Res. Commun. 435(4):685-690; Staudinger, M. (2014) “The Novel Immunotoxin HM1.24-ETA′ Induces Apoptosis In Multiple Myeloma Cells,” Blood Cancer J. 13; 4:e219, pp. 1-11). Antibodies that immunospecifically bind to CD317 are commercially available (Novus Biologicals LLC; BioLegend, Inc.; see also U.S. Pat. No. 8,834,876, which references the deposit of the heavy and light chains of antibody HM1.24 as FERM BP-5644 and FERM BP-5646; see also U.S. Pat. No. 8,394,374). The amino acid sequence of the VL Domain of the anti-CD317 antibody “HM1.24” (SEQ ID NO:302) is shown below (CDR residues are shown underlined):

(38) TABLE-US-00004 DIVMTQSHKF MSTSVGDRVS ITCKKASQDV NTAVAWYQQK PGQSPKLLIY SASNRYTGVP DRITGSGSGT DFTFTISSVQ AEDLALTTCQ QHYSTPFTFG SGTKLEIK

(39) The amino acid sequence of the VH Domain of the anti-CD317 antibody “HM1.24” (SEQ ID NO:303) is shown below (CDR residues are shown underlined):

(40) TABLE-US-00005 QVQLQQSGAE LARPGASVKL SCKASGYTFT PYWMQWVKQR PGQGLEWIGS IFPGDGDTRY SQKFKGKATL TADKSSSTAY MQLSILAFED SAVYYCARGL RRGGYYFDYW GQGTTLTVSS

(41) 3. CEACAM5- and CEACAM6-Binding Domains

(42) Carcinoembryonic Antigen-Related Cell Adhesion Molecules 5 (CEACAM5) and 6 (CEACAM6) have been found to be associated with various types of cancers including medullary thyroid cancer, colorectal cancer, pancreatic cancer, hepatocellular carcinoma, gastric cancer, lung cancer, head and neck cancers, urinary bladder cancer, prostate cancer, uterine cancer, endometrial cancer, breast cancer, hematopoietic cancer, leukemia and ovarian cancer (PCT Pubmication No. WO 2011/034660), and particularly colorectal, gastrointestinal, pancreatic, non-small cell lung cancer (NSCL), breast, thyroid, stomach, ovarian and uterine carcinomas (Zheng, C. et al. (2011) “A Novel Anti-CEACAM5 Monoclonal Antibody, CC4, Suppresses Colorectal Tumor Growth and Enhances NK Cells Mediated Tumor Immunity,” PLoS One 6(6):e21146, pp. 1-11).

(43) CEACAM5 has been found to be overexpressed in 90% of gastrointestinal, colorectal and pancreatic cancers, 70% of non-small cell lung cancer cells and 50% of breast cancers (Thompson, J. A. et al. (1991) “Carcinoembryonic Antigen Gene Family: Molecular Biology And Clinical Perspectives,” J. Clin. Lab. Anal. 5:344-366).

(44) Overexpressed carcinoembryonic antigen-related cellular adhesion molecule 6 (CEACAM6) plays important roles in the invasion and metastasis of a variety of human cancers, including medullary thyroid cancer, colorectal cancer, pancreatic cancer, hepatocellular carcinoma, gastric cancer, lung cancer, head and neck cancers, urinary bladder cancer, prostate cancer, uterine cancer, endometrial cancer, breast cancer, hematopoietic cancer, leukemia and ovarian cancer (PCT Pubmication No. WO 2011/034660; Deng, X. et al. (2014) “Expression Profiling Of CEACAM6 Associated With The Tumorigenesis And Progression In Gastric Adenocarcinoma,” Genet. Mol. Res. 13(3):7686-7697; Cameron, S. et al. (2012) “Focal Overexpression Of CEACAM6 Contributes To Enhanced Tumourigenesis In Head And Neck Cancer Via Suppression Of Apoptosis,” Mol. Cancer 11:74, pp. 1-11; Chapin, C. et al. (2012) “Distribution And Surfactant Association Of Carcinoembryonic Cell Adhesion Molecule 6 In Human Lung,” Amer. J. Physiol. Lung Cell. Mol. Physiol. 302(2):L216-L25; Riley, C. J. et al. (2009) “Design And Activity Of A Murine And Humanized Anti-CEACAM6 Single-Chain Variable Fragment In The Treatment Of Pancreatic Cancer,” Cancer Res. 69(5):1933-1940; Lewis-Wambi, J. S. et al. (2008) “Overexpression Of CEACAM6 Promotes Migration And Invasion Of Oestrogen-Deprived Breast Cancer Cells,” Eur. J. Cancer 44(12):1770-1779; Blumenthal, R. D. et al. (2007) “Expression Patterns Of CEACAM5 And CEACAM6 In Primary And Metastatic Cancers,” BMC Cancer. 7:2, pp. 1-15). Antibodies that immunospecifically bind to CEACAM5 and CEACAM6 are commercially available (Santa Cruz Biotechnology, Inc., Novus Biologicals LLC; Abnova Corporation). The amino acid sequence of the VL Domain of the humanized anti-CEACAM5/ANTI-CEACAM6 antibody 16C3 (EP 2585476) (SEQ ID NO:304) is shown below (CDR residues are shown underlined):

(45) TABLE-US-00006 DIQMTQSPSS LSASVGDRVT ITCGASENIY GALNWYQRKP GKSPKLLIWG ASNLADGMPS RFSGSGSGRQ YTLTISSLQP EDVATYYCQN VLSSPYTFGG GTKLEIK

(46) The amino acid sequence of the VH Domain of the humanized anti-CEACAM5/ANTI-CEACAM6 antibody 16C3 (EP 2585476) (SEQ ID NO:305) is shown below (CDR residues are shown underlined):

(47) TABLE-US-00007 QVQLQQSGPE VVRPGVSVKI SCKGSGYTFT DYAMHWVKQS HAKSLEWIGL ISTYSGDTKY NQNFKGKATM TVDKSASTAY MELSSLRSED TAVYYCARGD YSGSRYWFAY WGQGTLVTVS S

(48) The amino acid sequence of the VL Domain of the humanized anti-CEACAM5/CEACAM6 antibody hMN15 (WO 2011/034660) (SEQ ID NO:306) is shown below (CDR residues are shown underlined):

(49) TABLE-US-00008 DIQLTQSPSS LSASVGDRVT MTCSASSRVS YIHWYQQKPG KAPKRWIYGT STLASGVPAR FSGSGSGTDF TFTISSLQPE DIATYYCQQW SYNPPTFGQG TKVEIKR

(50) The amino acid sequence of the VH Domain of the humanized anti-CEACAM5/CEACAM6 antibody hMN15 (WO 2011/034660) (SEQ ID NO:307) is shown below (CDR residues are shown underlined):

(51) TABLE-US-00009 QVQLVESGGG VVQPGRSLRL SCSSSGFALT DYYMSWVRQA PGKGLEWLGF IANKANGHTT DYSPSVKGRF TISRDNSKNT LFLQMDSLRP EDTGVYFCAR DMGIRWNFDV WGQGTPVTVS S

(52) 4. DR5-Binding Domains

(53) DR5 is a preferred Cancer Antigen of the present invention. The preferred anti-human DR5-binding molecules of the present invention possess the VL and/or VH Domains of murine anti-human DR5 monoclonal antibodies “DR5 mAb 1” and/or “DR5 mAb 2,” and more preferably possess 1, 2 or all 3 of the CDRs of the VL Domain and/or 1, 2 or all 3 of the CDRs of the VH Domain of such anti-human DR5 monoclonal antibodies. Alternatively, any anti-human DR5 monoclonal antibody may be employed, particularly: drozitumab (designated herein as “DR5 mAb 3”), conatumumab (designated herein as “DR5 mAb 4”), tigatuzumab (designated herein as “DR5 mAb 5”), LBY135-1 (designated herein as “DR5 mAb 6”), LBY135-2 (designated herein as “DR5 mAb 7”) and KMTR2 (designated herein as “DR5 mAb 8”).

(54) a. The Anti-Human DR5 Antibody DR5 mAb 1

(55) DR5 has potential utility in the treatment of a wide range of cancers (e.g., colorectal cancer, hepatocellular carcinoma, glioma, kidney cancer, breast cancer, multiple myeloma, bladder cancer, neuroblastoma; sarcoma, non-Hodgkin's lymphoma, non-small cell lung cancer, ovarian cancer, pancreatic cancer and rectal cancer. The amino acid sequence of human DR5 precursor (NCBI Sequence NP_003833.4) (SEQ ID NO:2) is:

(56) TABLE-US-00010 MEQRGQNAPA ASGARKRHGP GPREARGARP GLRVPKTLVL VVAAVLLLVS AESALITQQD LAPQQRVAPQ QKRSSPSEGL CPPGHHISED GRDCISCKYG QDYSTHWNDL LFCLRCTRCD SGEVELSPCT TTRNTVCQCE EGTFREEDSP EMCRKCRTGC PRGMVKVGDC TPWSDIECVH KESGTKHSGE APAVEETVTS SPGTPASPCS LSGIIIGVTV AAVVLIVAVF VCKSLLWKKV LPYLKGICSG GGGDPERVDR SSQRPGAEDN VLNEIVSILQ PTQVPEQEME VQEPAEPTGV NMLSPGESEH LLEPAEAERS QRRRLLVPAN EGDPTETLRQ CFDDFADLVP FDSWEPLMRK LGLMDNEIKV AKAEAAGHRD TLYTMLIKWV NKTGRDASVH TLLDALETLG ERLAKQKIED HLLSSGKFMY LEGNADSAMS

(57) The amino acid sequence of the VL Domain of DR5 mAb 1 (SEQ ID NO:3) is shown below (CDR residues are shown underlined):

(58) TABLE-US-00011 DIVLTQSPAS LAVSLGQRAT ISCRASKSVS SSGYSYMHWY QQKPGQPPKV LIFLSSNLDS GVPARFSGSG SGTDFTLNIH PVEDGDAATY YCQHSRDLPP TFGGGTKLEI K CDR.sub.L1 of DR5 mAb 1 (SEQ ID NO: 4): RASKSVSSSGYSYMH CDR.sub.L2 of DR5 mAb 1 (SEQ ID NO: 5): LSSNLDS CDR.sub.L3 of DR5 mAb 1 (SEQ ID NO: 6): QHSRDLPPT

(59) The VL Domain of DR5 mAb 1 is preferably encoded by a polynucleotide (SEQ ID NO:7) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(60) TABLE-US-00012 gacattgtgc tgacacagtc tcctgcttcc ttagctgtat ctctcgggca gagggccacc atctcatgca gggccagcaa aagtgtcagt tcctctggct atagttatat gcactggtac caacagaaac caggacagcc acccaaagtc ctcatctttc tttcatccaa cctagattct ggggtccctg ccaggttcag tggcagtggg tctgggacag acttcaccct caacatccat cctgtggagg atggggatgc tgcaacctat tactgtcagc acagtaggga tcttcctccg acgttcggtg gaggcaccaa gctggaaatc aaa

(61) The amino acid sequence of the VH Domain of DR5 mAb 1 (SEQ ID NO:8) is shown below (CDR residues are shown underlined). The C-terminal amino acid may be substituted with alanine to facilitate subcloning of this VH Domain.

(62) TABLE-US-00013 EVKFLESGGG LVQPGGSLKL SCVASGFDFS RYWMSWVRQA PGKGLEWIGE INPDSNTINY TPSLKDKFII SRDNAKNTLY LQMTKVRSED TALYYCTRRA YYGNPAWFAY WGQGTLVTVSS CDR.sub.H1 of DR5 mAb 1 (SEQ ID NO: 9): GFDFSRYWMS CDR.sub.H2 of DR5 mAb 1 (SEQ ID NO: 10): EINPDSNTINYTPSLKD CDR.sub.H3 of DR5 mAb 1 (SEQ ID NO: 11): RAYYGNPAWFAY

(63) The VH Domain of DR5 mAb 1 is preferably encoded by a polynucleotide (SEQ ID NO:12) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(64) TABLE-US-00014 gaggtgaagt ttctcgagtc tggaggtggc ctggtgcagc ctggaggatc cctgaaactc tcctgtgtag cctcaggatt cgattttagt agatactgga tgagttgggt ccggcaggct ccagggaaag ggctagaatg gattggagaa attaatccag atagcaatac gataaactat acgccatctc taaaggataa attcatcatc tccagagaca acgccaaaaa tacgctgtat ctgcaaatga ccaaagtgag atctgaggac acagcccttt attattgtac aagaagggcc tactatggta acccggcctg gtttgcttac tggggccaag ggactctggt cactgtctct tcc

(65) b. The Anti-Human DR5 Antibody DR5 mAb 2

(66) (1) Murine Anti-Human Antibody DR5 mAb 2

(67) The amino acid sequence of the VL Domain of DR5 mAb 2 (SEQ ID NO:13) is shown below (CDR residues are shown underlined):

(68) TABLE-US-00015 DIVMTQSHKF MSTSVGDRVS ITCKASQDVN TAVAWYQQKP GQSPKLLIYW ASTRHTGVPD RFTGSGSGTD YTLTIKSVQA EDLTLYYCQQ HYITPWTFGG GTKLEIK CDRL1 of DR5 mAb 2 (SEQ ID NO: 14): KASQDVNTAVA CDRL2 of DR5 mAb 2 (SEQ ID NO: 15): WASTRHT CDRL3 of DR5 mAb 2 (SEQ ID NO: 16): QQHYITPWT

(69) The VL Domain of DR5 mAb 2 is preferably encoded by a polynucleotide (SEQ ID NO:17) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(70) TABLE-US-00016 gacattgtga tgacccagtc tcacaaattc atgtccactt cagtaggaga cagggtcagc atcacctgca aggccagtca ggatgtgaat actgctgtag cctggtatca acaaaaacca gggcaatctc ctaaactact gatttactgg gcatccaccc ggcacactgg agtccctgat cgcttcacag gcagtggatc tgggacagat tatacactca ccatcaaaag tgtgcaggct gaagacctga cactttatta ctgtcagcaa cactatatca ctccgtggac gttcggtgga ggcaccaagc tggaaatcaaa

(71) The amino acid sequence of the VH Domain of DR5 mAb 2 (SEQ ID NO:18) is shown below (CDR residues are shown underlined):

(72) TABLE-US-00017 KVQLQQSGAE LVKPGASVKL SCKASGYTFT EYILHWVKQK SGQGLEWIGW FYPGNNNIKY NEKFKDKATL TADKSSSTVY MELSRLTSED SAVYFCARHE QGPGYFDYWG QGTTLTVSS CDRH1 of DR5 mAb 2 (SEQ ID NO: 19): GYTFTEYILH CDRH2 of DR5 mAb 2 (SEQ ID NO: 20): WFYPGNNNIKYNEKFKD CDRH3 of DR5 mAb 2 (SEQ ID NO: 21): HEQGPGYFDY

(73) The VH Domain of DR5 mAb 2 is preferably encoded by a polynucleotide (SEQ ID NO:22) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(74) TABLE-US-00018 aaggtccagc tgcagcagtc tggagctgaa ctggtgaaac ccggggcatc agtgaagctg tcctgcaagg cttctgggta caccttcact gagtatattt tacactgggt aaagcagaag tctggacagg gtcttgagtg gattgggtgg ttttatcctg gaaataataa tataaagtac aatgagaaat tcaaggacaa ggccacactg actgcggaca aatcctccag cacagtctat atggaactta gtagattgac atctgaagac tctgcggtct atttctgtgc aagacacgaa caaggaccag gttactttga ctactggggc caaggcacca ctctcacagt ctcctcc

(75) (2) Humanized DR5 mAb 2 (“hDR5 mAb 2”)

(76) The above-described murine anti-human DR5 antibody DR5 mAb 2 was humanized in order to demonstrate the capability of humanizing an anti-human DR5 antibody so as to decrease its antigenicity upon administration to a human recipient. The humanization yielded four humanized VL Domains designated herein as “hDR5 mAb 2 VL-2,” “hDR5 mAb 2 VL-3,” “hDR5 mAb 2 VL-4,” and “hDR5 mAb 2 VL-5,” and one humanized VH Domain, designated herein as “hDR5 mAb 2 VH-2.” Any of the humanized VL Domains may be paired with the humanized VH Domain. Accordingly, any antibody comprising one of the humanized VL Domains paired with the humanized VH Domain is referred to generically as “hDR5 mAb 2,” and particular combinations of humanized VL/VH Domains are referred to by reference to the VL domain.

(77) The amino acid sequence of the VL Domain of hDR5 mAb 2 VL-2 (SEQ ID NO:23) is shown below (CDR residues are shown underlined):

(78) TABLE-US-00019 DIQMTQSPSF LSASVGDRVT ITCKASQDVN TAVAWYQQKP GKAPKLLIYW ASTRHTGVPS RFSGSGSGTD FTLTISSLQP EDVATYYCQQ HYITPWTFGG GTKLEIK

(79) hDR5 mAb 2 VL-2 is preferably encoded by a polynucleotide (SEQ ID NO:24) having the sequence shown below:

(80) TABLE-US-00020 gatattcaga tgacccagag tccctcattt ctgtccgcct ccgtcggtga ccgcgtgact attacttgta aagcttctca ggatgtcaac accgccgtgg cttggtacca gcagaagccc ggtaaagcac ctaagctgct gatctattgg gccagcactc ggcacaccgg agtcccatct aggttctctg gcagtggatc agggacagac tttaccctga caattagctc cctgcagccc gaggatgtgg ctacttacta ttgtcagcag cactacatca ctccttggac cttcggcggg ggcacaaaac tggaaatcaa a

(81) The amino acid sequence of the VL Domain of hDR5 mAb 2 VL-3 (SEQ ID NO:25) is shown below (CDR residues are shown underlined):

(82) TABLE-US-00021 DIQMTQSPSF LSASVGDRVT ITCRASQDVN TAVAWYQQKP GKAPKLLIYW ASTRHTGVPD RFSGSGSGTD FTLTISSLQP EDVATYYCQQ HYITPWTFGG GTKLEIK

(83) hDR5 mAb 2 VL-3 is preferably encoded by a polynucleotide (SEQ ID NO:26) having the sequence shown below:

(84) TABLE-US-00022 gatattcaga tgacccagag tccctcattt ctgtccgcct ccgtcggtga ccgcgtgact attacttgtc gggcttctca ggatgtcaac accgccgtgg cttggtacca gcagaagccc ggtaaagcac ctaagctgct gatctattgg gccagcactc ggcacaccgg agtcccagat aggttctctg gcagtggatc agggacagac tttaccctga caattagctc cctgcagccc gaggatgtgg ctacttacta ttgtcagcag cactacatca ctccttggac cttcggcggg ggcacaaaac tggaaatcaa a

(85) The amino acid sequence of the VL Domain of hDR5 mAb 2 VL-4 (SEQ ID NO:27) is shown below (CDR residues are shown underlined):

(86) TABLE-US-00023 DIQMTQSPSF LSASVGDRVT ITCRASQDVN TAVAWYQQKP GKAPKLLIYW ASTRHTGVPS RFSGSGSGTD FTLTISSLQP EDIATYYCQQ HYITPWTFGG GTKLEIK

(87) hDR5 mAb 2 VL-4 is preferably encoded by a polynucleotide (SEQ ID NO:28) having the sequence shown below:

(88) TABLE-US-00024 gatattcaga tgacccagag tccctcattt ctgtccgcct ccgtcggtga ccgcgtgact attacttgtc gggcttctca ggatgtcaac accgccgtgg cttggtacca gcagaagccc ggtaaagcac ctaagctgct gatctattgg gccagcactc ggcacaccgg agtcccatct aggttctctg gcagtggatc agggacagac tttaccctga caattagctc cctgcagcca gaggatatcg ctacatacta ttgtcagcag cactacatca ctccttggac cttcggcggg ggcacaaaac tggaaatcaa a

(89) The amino acid sequence of the VL Domain of hDR5 mAb 2 VL-5 (SEQ ID NO:29) is shown below (CDR residues are shown underlined):

(90) TABLE-US-00025 DIQMTQSPSF LSASVGDRVT ITCRASQDVN TAVAWYQQKP GKAPKLLIYW ASTRHTGVPD RFSGSGSGTD FTLTISSLQP EDIATYYCQQ HYITPWTFGG GTKLEIK

(91) hDR5 mAb 2 VL-5 is preferably encoded by a polynucleotide (SEQ ID NO:30) having the sequence shown below:

(92) TABLE-US-00026 gatattcaga tgacccagag tccctcattt ctgtccgcct ccgtcggtga ccgcgtgact attacttgtc gggcttctca ggatgtcaac accgccgtgg cttggtacca gcagaagccc ggtaaagcac ctaagctgct gatctattgg gccagcactc ggcacaccgg agtcccagat aggttctctg gcagtggatc agggacagac tttaccctga caattagctc cctgcagccc gaggatatcg ctacttacta ttgtcagcag cactacatca ctccttggac cttcggcggg ggcacaaaac tggaaatcaa a

(93) The amino acid sequence of the VH Domain of hDR5 mAb 2 VH-2 (SEQ ID NO:31) is shown below (CDR residues are shown underlined):

(94) TABLE-US-00027 QVQLVQSGAE VKKPGASVKV SCKASGYTFT EYILHWVRQA PGQGLEWMGW FYPGNNNIKY NEKFKDRVTI TADKSTSTVY MELSSLRSED TAVYYCARHE QGPGYFDYWG QGTLVTVSS

(95) hDR5 mAb 2 VH-2 is preferably encoded by a polynucleotide (SEQ ID NO:32) having the sequence shown below:

(96) TABLE-US-00028 caggtccagc tggtgcagag tggggcagag gtgaaaaagc caggggcatc agtgaaagtg tcttgtaaag catcaggtta tacatttact gagtacatcc tgcactgggt gcgacaggca ccaggacagg gactggaatg gatggggtgg ttctaccctg gcaacaacaa cattaagtac aacgagaagt ttaaagaccg ggtgaccatc acagcggata agtctaccag tacagtctat atggagctga gctccctgag aagcgaagac accgccgtct actattgcgc tcgccacgaa cagggtccag gttactttga ttattggggg cagggaactc tggtcacagt cagctcc

(97) The CDR1 of the VL Domain of hDR5 mAb 2 VL-3, hDR5 mAb 2 VL-4 and hDR5 mAb VL-5 has the amino acid sequence: RASQDVNTAVA (SEQ ID NO:320).

(98) c. Drozitumab (“DR5 mAb 3”)

(99) The amino acid sequence of the VL Domain of drozitumab (“DR5 mAb 3”) (SEQ ID NO:54) is shown below (CDR residues are shown underlined):

(100) TABLE-US-00029 SELTQDPAVS VALGQTVRIT CSGDSLRSYY ASWYQQKPG QAPVLVIYGA NNRPSGIPDR FSGSSSGNTA SLTITGAQAE DEADYYCNSA DSSGNHVVFG GGTKLTVLG CDRL1 of DR5 mAb 3 (SEQ ID NO: 55): SGDSLRSYYAS CDRL2 of DR5 mAb 3 (SEQ ID NO: 56): GANNRPS CDRL3 of DR5 mAb 3 (SEQ ID NO: 57): NSADSSGNHVV

(101) The amino acid sequence of the VH Domain of drozitumab (“DR5 mAb 3”) (SEQ ID NO:58) is shown below (CDR residues are shown underlined):

(102) TABLE-US-00030 EVQLVQSGGG VERPGGSLRL SCAASGFTFD DYAMSWVRQA PGKGLEWVSG INWQGGSTGY ADSVKGRVTI SRDNAKNSLY LQMNSLRAED TAVYYCAKIL GAGRGWYFDY WGKGTTVTVS S CDR.sub.H1 of DR5 mAb 3 (SEQ ID NO: 59): GFTFDDYAMS CDR.sub.H2 of DR5 mAb 3 (SEQ ID NO: 60): INWQGGSTGYADSVKG CDR.sub.H3 of DR5 mAb 3 (SEQ ID NO: 61): ILGAGRGWYFDY

(103) d. Conatumumab (“DR5 mAb 4”)

(104) The amino acid sequence of the VL Domain of conatumumab (“DR5 mAb 4”) (SEQ ID NO:62) is shown below (CDR residues are shown underlined):

(105) TABLE-US-00031 EIVLTQSPGT LSLSPGERAT LSCRASQGIS RSYLAWYQQK PGQAPSLLIY GASSRATGIP DRFSGSGSGT DFTLTISRLE PEDFAVYYCQ QFGSSPWTFG QGTKVEIK CDR.sub.L1 of DR5 mAb 4 (SEQ ID NO: 63): RASQGISRSYLA CDR.sub.L2 of DR5 mAb 4 (SEQ ID NO: 64): GASSRAT CDR.sub.L3 of DR5 mAb 4 (SEQ ID NO: 65): QQFGSSPWT

(106) The amino acid sequence of the VH Domain of conatumumab (“DR5 mAb 4”) (SEQ ID NO:66) is shown below (CDR residues are shown underlined):

(107) TABLE-US-00032 QVQLQESGPG LVKPSQTLSL TCTVSGGSIS SGDYFWSWIR QLPGKGLEWI GHIHNSGTTY YNPSLKSRVT ISVDTSKKQF SLRLSSVTAA DTAVYYCARD RGGDYYYGMD VWGQGTTVTV SS CDR.sub.H1 of DR5 mAb 4 (SEQ ID NO: 67): GGSISSGDYFWS CDR.sub.H2 of DR5 mAb 4 (SEQ ID NO: 68): HIHNSGTTYYNPSLKS CDR.sub.H3 of DR5 mAb 4 (SEQ ID NO: 69): DRGGDYYYGMDV

(108) e. Tigatumumab (“DR5 mAb 5”)

(109) The amino acid sequence of the VL Domain of tigatumumab (“DR5 mAb 5”) (SEQ ID NO:70) is shown below (CDR residues are shown underlined):

(110) TABLE-US-00033 DIQMTQSPSS LSASVGDRVT ITCKASQDVG TAVAWYQQKP GKAPKLLIYW ASTRHTGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YSSYRTFGQG TKVEIK CDR.sub.L1 of DR5 mAb 5 (SEQ ID NO: 71): KASQDVGTAVA CDR.sub.L2 of DR5 mAb 5 (SEQ ID NO: 72): WASTRHT CDR.sub.L3 of DR5 mAb 5 (SEQ ID NO: 73): QQYSSYRT

(111) The amino acid sequence of the VH Domain of tigatumumab (“DR5 mAbS”) (SEQ ID NO:74) is shown below (CDR residues are shown underlined):

(112) TABLE-US-00034 EVQLVESGGG LVQPGGSLRL SCAASGFTFS SYVMSWVRQA PGKGLEWVAT ISSGGSYTYY PDSVKGRFTI SRDNAKNTLY LQMNSLRAED TAVYYCARRG DSMITTDYWG QGTLVTVSS CDR.sub.H1 of DR5 mAb 5 (SEQ ID NO: 75): GFTFSSYVMS CDR.sub.H2 of DR5 mAb 5 (SEQ ID NO: 76): TISSGGSYTYYPDSVKG CDR.sub.H3 of DR5 mAb 5 (SEQ ID NO: 77): RGDSMITTDY

(113) f. LBY135-1 (“DR5 mAb 6”)

(114) The amino acid sequence of the VL Domain of LBY135-1 (“DR5 mAb 6”) (SEQ ID NO:78) is shown below (CDR residues are shown underlined):

(115) TABLE-US-00035 DIAMTQSHKF MSTLVGDRVS ITCKASQDVN TAIAWYQQKP GQSPKLLIYW ASTRHTGVPD RFYGSGSGTD YTLTISSMEA EDAATYYCQQ WSSNPLTFGA GTKLELKRA CDR.sub.L1 of DR5 mAb 6 (SEQ ID NO: 79): QDVNTAIA CDR.sub.L2 of DR5 mAb 6 (SEQ ID NO: 80): WASTRHT CDR.sub.L3 of DR5 mAb 6 (SEQ ID NO: 81): QQWSSNPLT

(116) The amino acid sequence of the VH Domain of LBY135-1 (“DR5 mAb 6”) (SEQ ID NO:82) is shown below (CDR residues are shown underlined):

(117) TABLE-US-00036 KVQLQQSGAE LVKPGASVKL SCKASGYTFT DYTIHWVKQR SGQGLEWIGW FYPGGGYIKY NEKFKDRATL TADKSSNTVY MELSRLTSEG SAVYFCARHE EGIYFDYWGQ GTTLVTVSS CDR.sub.H1 of DR5 mAb 6 (SEQ ID NO: 83): GYTFTDYTIH CDR.sub.H2 of DR5 mAb 6 (SEQ ID NO: 84): WFYPGGGYIKYNEKFKD CDR.sub.H3 of DR5 mAb 6 (SEQ ID NO: 85): HEEGIYFDY

(118) g. LBY135-2 (“DR5 mAb 7”)

(119) The amino acid sequence of the VL Domain of LBY135-2 (“DR5 mAb 7”) (SEQ ID NO:86) is shown below (CDR residues are shown underlined):

(120) TABLE-US-00037 DIVMTQSHKF MSTSVGDRVS ITCKASQDVN TAIAWYQQKP GQSPKLLIYW ASTRHTGVPD RFTGSGSGTD YTLTISSVQA EDLALYYCQQ HYTTPFTFGS GTKL CDR.sub.L1 of DR5 mAb 7 (SEQ ID NO: 87): KASQDVNTAIA CDR.sub.L2 of DR5 mAb 7 (SEQ ID NO: 88): WASTRHT CDR.sub.L3 of DR5 mAb 7 (SEQ ID NO: 89): QQHYTTPFT

(121) The amino acid sequence of the VH Domain of LBY135-2 (“DR5 mAb 7”) (SEQ ID NO:90) is shown below (CDR residues are shown underlined):

(122) TABLE-US-00038 KVQLQQSGAE LVKPGASVKL SCKASGYTFT DYTIHWVKQR SGQGLEWIGW FYPGGGYIKY NEKFKDRATL TADKSSNTVY MELSRLTSED SAVYFCARHE EGIYFDYWGQ GTTLTVSS CDR.sub.H1 of DR5 mAb 7 (SEQ ID NO: 91): GYTFTDYTIH CDR.sub.H2 of DR5 mAb 7 (SEQ ID NO: 92): WFYPGGGYIKYNEKFKD CDR.sub.H3 of DR5 mAb 7 (SEQ ID NO: 93): HEEGIYFDY

(123) h. KMTR2 (“DR5 mAb 8”)

(124) The amino acid sequence of the VL Domain of KMTR2 (“DR5 mAb 8”) (SEQ ID NO:94) is shown below (CDR residues are shown underlined):

(125) TABLE-US-00039 EIVLTQSPAT LSLSPGERAT LSCRASQSVS SYLAWYQQKP GQAPRLLIYD ASNRATGIPA RFSGSGSGTD FTLTISSLEP EDFAVYYCQQ RSNWPLTFGG GTKVEIKR CDR.sub.L1 of DR5 mAb 8 (SEQ ID NO: 95): RASQSVSSYLA CDR.sub.L2 of DR5 mAb 8 (SEQ ID NO: 96): DASNRAT CDR.sub.L3 of DR5 mAb 8 (SEQ ID NO: 97): QQRSNWPLT

(126) The amino acid sequence of the VH Domain of KMTR2 (“DR5 mAb 8”) (SEQ ID NO:98) is shown below (CDR residues are shown underlined):

(127) TABLE-US-00040 QVQLVQSGAE MKKPGASVKV SCKTSGYTFT NYKINWVRQA PGQGLEWMGW MNPDTDSTGY PQKFQGRVTM TRNTSISTAY MELSSLRSED TAVYYCARSY GSGSYYRDYY YGMDVWGQGT TVTVSS CDR.sub.H1 of DR5 mAb 8 (SEQ ID NO: 99): GYTFTNYKIN CDR.sub.H2 of DR5 mAb 8 (SEQ ID NO: 100): WMNPDTDSTGYPQKFQG CDR.sub.H3 of DR5 mAb 8 (SEQ ID NO: 101): SYGSGSYYRDYYYGMDV

(128) 5. EphA2-Binding Domains

(129) The receptor tyrosine kinase, ephrin type-A receptor 2 (EphA2) is a preferred cancer antigen of the present invention. EphA2 is normally expressed at sites of cell-to-cell contact in adult epithelial tissues, however, recent studies have shown that it is also overexpressed in various types of epithelial carcinomas, with the greatest level of EphA2 expression observed in metastatic lesions. High expression levels of EphA2 have been found in a wide range of cancers and in numerous tumor cell lines, including prostate cancer, breast cancer, non-small cell lung cancer and melanoma (Xu, J. et al. (2014) “High Epha2 Protein Expression In Renal Cell Carcinoma Is Associated With A Poor Disease Outcome,” Oncol. Lett. August 2014; 8(2): 687-692; Miao, B. et al. (2014) “EphA2 is a Mediator of Vemurafenib Resistance and a Novel Therapeutic Target in Melanoma,” Cancer Discov. pii: CD-14-0295. EphA2 does not appear to be merely a marker for cancer, but rather appears to be persistently overexpressed and functionally changed in numerous human cancers (Chen, P. et al. (2014) “Epha2 Enhances The Proliferation And Invasion Ability Of Lncap Prostate Cancer Cells,” Oncol. Lett. 8(1):41-46).

(130) The invention particularly contemplates the selection of EphA2 as a Cancer Antigen, and the use of anti-EphA2 antibodies to provide the Cancer Antigen-Binding Domain of the Tri-Specific Binding Molecules of the present invention. Exemplary anti-EphA2 antibodies include “EphA2 mAb 1,” “EphA2 mAb 2” and “EphA2 mAb 3”.

(131) a. EphA2 mAb 1

(132) The amino acid sequence of the VL Domain of a preferred anti-human EphA2 antibody (“EphA2 mAb 1”) (SEQ ID NO:153) is shown below (CDR residues are shown underlined):

(133) TABLE-US-00041 DIQMTQTTSS LSASLGDRIT ISCRASQDIS NYLNWYQQKP DGTVKLLIYY TSRLHSGVPS RFSGSGSGTD YSLTISNLEQ EDIATYFCQQ GYTLYTFGGG TKLEIK CDR.sub.L1 of EphA2 mAb 1 (SEQ ID NO: 154): RASQDISNYLN CDR.sub.L2 of EphA2 mAb 1 (SEQ ID NO: 155): YTSRLHS CDR.sub.L3 of EphA2 mAb 1 (SEQ ID NO: 156): QQGYTLYT

(134) The VL Domain of EphA2 mAb 1 is preferably encoded by a polynucleotide (SEQ ID NO:157) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(135) TABLE-US-00042 gatatccaga tgacacagac tacatcctcc ctgtctgcct ctctgggaga cagaatcacc atcagttgca gggcaagtca ggacattagc aattatttaa actggtatca gcagaaacca gatggaactg ttaaactcct gatctactac acatcaagat tacactcagg agtcccatca aggttcagtg gcagtgggtc tggaacagat tattctctca ccattagcaa cctggagcaa gaagatattg ccacttactt ttgccaacag ggttatacgc tgtacacgtt cggagggggg accaagctgg aaataaaa

(136) The amino acid sequence of the VH Domain of EphA2 mAb 1 (SEQ ID NO:158) is shown below (CDR residues are shown underlined):

(137) TABLE-US-00043 QVQLKESGPG LVAPSQSLSI TCTVSGFSLS RYSVHWVRQP PGKGLEWLGM IWGGGSTDYN SALKSRLSIS KDNSKSQVFL KMNSLQTDDT AMYYCARKHG NYYTMDYWGQ GTSVTVSS CDR.sub.H1 of EphA2 mAb 1 (SEQ ID NO: 159): GFSLSRYSVH CDR.sub.H2 of EphA2 mAb 1 (SEQ ID NO: 160): MIWGGGSTDYNSALKS CDR.sub.H3 of EphA2 mAb 1 (SEQ ID NO: 161): KHGNYYTMDY

(138) The VH Domain of EphA2 mAb 1 is preferably encoded by a polynucleotide (SEQ ID NO:162) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(139) TABLE-US-00044 caggtgcagc tgaaggagtc aggacctggc ctggtggcac cctcacagag cctgtccatc acatgcactg tctctgggtt ctcattatcc agatatagtg tacactgggt tcgccagcct ccaggaaagg gtctggagtg gctgggaatg atatggggtg gtggaagcac agactataat tcagctctca aatccagact gagtatcagc aaggacaact ccaagagcca agttttctta aaaatgaaca gtctgcaaac tgatgacaca gccatgtact actgtgccag aaaacatggt aactactata ctatggacta ctggggtcaa ggaacctcag tcaccgtctc ctcc

(140) b. EphA2 mAb 2

(141) The amino acid sequence of the VL Domain of a second preferred anti-human EphA2 antibody (“EphA2 mAb 2”) (SEQ ID NO:163) is shown below (CDR residues are shown underlined):

(142) TABLE-US-00045 DVVMTQTPLS LPVSLGDQAS ISCRSSQSLV HSSGNTYLHW YLQKPGQSPK LLIYKVSNRF SGVPDRFSGS GSGTDFTLKI SRVEAEDLGV YFCSQSTHVP TFGSGTKLEI K CDR.sub.L1 of EphA2 mAb 2 (SEQ ID NO: 164): RSSQSLVHSSGNTYLH CDR.sub.L2 of EphA2 mAb 2 (SEQ ID NO: 165): KVSNRFS CDR.sub.L3 of EphA2 mAb 2 (SEQ ID NO: 166): SQSTHVPT

(143) The VL Domain of EphA2 mAb 2 is preferably encoded by a polynucleotide (SEQ ID NO:318) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(144) TABLE-US-00046 gatgttgtga tgacccaaac tccactctcc ctgcctgtca gtcttggaga tcaagcctcc atctcttgca gatctagtca gagccttgta cacagtagtg gaaacaccta tttacattgg tacctgcaga agccaggcca gtctccaaag ctcctgatct acaaagtttc caaccgattt tctggggtcc cagacaggtt cagtggcagt ggatcaggga cagatttcac actcaagatc agcagagtgg aggctgagga tctgggagtt tatttctgct ctcaaagtac acatgttccc acgttcggct cggggacaaa gttggaaata aaa

(145) The amino acid sequence of the VH Domain of EphA2 mAb 2 (SEQ ID NO:167) is shown below (CDR residues are shown underlined):

(146) TABLE-US-00047 QIQLVQSGPE LKKPGETVKI SCKASGFTFT NYGMNWVKQA PGKGLKWMGW INTYIGEPTY ADDFKGRFVF SLETSASTAY LQINNLKNED MATYFCAREL GPYYFDYWGQ GTTLTVSS CDR.sub.H1 of EphA2 mAb 2 (SEQ ID NO: 168): GFTFTNYGMN CDR.sub.H2 of EphA2 mAb 2 (SEQ ID NO: 169): WINTYIGEPTYADDFKG CDR.sub.H3 of EphA2 mAb 2 (SEQ ID NO: 170): ELGPYYFDY

(147) The VH Domain of EphA2 mAb 2 is preferably encoded by a polynucleotide (SEQ ID NO:171) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(148) TABLE-US-00048 cagatccagt tggtgcagtc tggacctgag ctgaagaagc ctggagagac agtcaagatc tcctgcaagg cttctgggtt taccttcaca aactatggaa tgaactgggt gaagcaggct ccaggaaagg gtttaaagtg gatgggctgg ataaacacct atattggaga gccgacatat gctgatgact tcaagggacg gtttgtcttc tctttggaaa cctctgccag cactgcctat ttgcagatca acaacctcaa aaatgaggac atggccacat atttctgtgc aagagaactg ggaccatact actttgacta ctggggccaa ggcaccactc tcacagtctc ctcc

(149) c. EphA2 mAb 3

(150) The amino acid sequence of the VL Domain of a further preferred anti-human EphA2 antibody (“EphA2 mAb 3”) (SEQ ID NO:172) is shown below (CDR residues are shown underlined):

(151) TABLE-US-00049 DIVLTQSHRS MSTSVGDRVN ITCKASQDVT TAVAWYQQKP GQSPKLLIFW ASTRHAGVPD RFTGSGSGTD FTLTISSVQA GDLALYYCQQ HYSTPYTFGG GTKLEIK CDR.sub.L1 of EphA2 mAb 3 (SEQ ID NO: 173): KASQDVTTAVA CDR.sub.L2 of EphA2 mAb 3 (SEQ ID NO: 174): WASTRHA CDR.sub.L3 of EphA2 mAb 3 (SEQ ID NO: 175): QQHYSTPYT

(152) The VL Domain of EphA2 mAb 3 is preferably encoded by a polynucleotide (SEQ ID NO:176) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(153) TABLE-US-00050 gacattgtgc tgacccagtc tcacagatcc atgtccacat cagtaggaga cagggtcaac atcacctgca aggccagtca ggatgtgact actgctgtag cctggtatca acaaaaacca gggcaatctc ctaaattact gattttctgg gcatccaccc ggcacgctgg agtccctgat cgcttcacag gcagtggatc tgggacagat tttactctca ccatcagcag tgtgcaggct ggagacctgg cactttatta ctgtcaacaa cattatagca caccgtacac attcggaggg gggaccaagc tggaaataaa a

(154) The amino acid sequence of the VH Domain of EphA2 mAb 3 (SEQ ID NO:177) is shown below (CDR residues are shown underlined):

(155) TABLE-US-00051 EVQLVESGGG SVKPGGSLKL SCAASGFTFT DHYMYWVRQT PEKRLEWVAT ISDGGSFTSY PDSVKGRFTI SRDIAKNNLY LQMSSLKSED TAMYYCTRDE SDRPFPYWGQ GTLVTVSS CDR.sub.H1 of EphA2 mAb 3 (SEQ ID NO: 178): GFTFTDHYMY CDR.sub.H2 of EphA2 mAb 3 (SEQ ID NO: 179): TISDGGSFTSYPDSVKG CDR.sub.H3 of EphA2 mAb 3 (SEQ ID NO: 180): DESDRPFPY

(156) The VH Domain of EphA2 mAb 3 is preferably encoded by a polynucleotide (SEQ ID NO:319) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(157) TABLE-US-00052 gaagtgcagc tggtggagtc tgggggaggc tcagtgaagc ctggagggtc cctgaaactc tcctgtgcag cctctggatt cactttcact gaccattaca tgtattgggt tcgccagact ccggaaaaga ggctggagtg ggtcgcaacc attagtgatg gcggtagttt cacctcctat ccagacagtg tgaaggggcg attcaccatc tccagagaca ttgccaagaa caacctgtac ctccaaatga gcagtctgaa gtctgaggac acagccatgt attactgtac aagagatgag agcgataggc cgtttcctta ctggggccaa gggactctgg tcactgtctc ctcc

(158) 6. gpA33-Binding Domains

(159) gpA33 is also a preferred cancer antigen of the present invention. Colorectal cancer is among the most common malignancies of the Western world and is a leading cause of cancer deaths (Silverberg, E. et al. (1989) “Cancer Statistics, 1989,” CA Cancer J Clin. 39(1):3-20). One potentially useful target for colon cancer is the 43 kD transmembrane glycoprotein A33 (gpA33), which is expressed in >95% of all colorectal carcinomas (Heath, J. K. et al. (1997) “The Human A33 Antigen Is A Transmembrane Glycoprotein And A Novel Member Of The Immunoglobulin Superfamily,” Proc. Natl. Acad. Sci. (U.S.A.) 94(2):469-474; Ritter, G. et al. (1997) “Characterization Of Posttranslational Modifications Of Human A33Antigen, A Novel Palmitoylated Surface Glycoprotein Of Human Gastrointestinal Epithelium,” Biochem. Biophys. Res. Commun. 236(3):682-686; Wong, N. A. et al. (2006) “EpCAM and gpA33 Are Markers Of Barrett's Metaplasia,” J. Clin. Pathol. 59(3):260-263). gpA33 was first discovered through raising monoclonal murine antibodies against the human pancreatic carcinoma derived cell line ASPC1.

(160) The invention particularly contemplates the selection of gpA33 as a Cancer Antigen, and the use of anti-gpA33 antibodies to provide the Cancer Antigen-Binding Domain of the Tri-Specific Binding Molecules of the present invention. An exemplary anti-gpA33 antibody is “gpA33 mAb 1.”

(161) The amino acid sequence of the VL Domain of a preferred anti-human gpA33 antibody (“gpA33 mAb 1”) (SEQ ID NO:181) is shown below (CDR residues are shown underlined):

(162) TABLE-US-00053 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIK CDR.sub.L1 of gpA33 mAb 1 (SEQ ID NO: 182): SARSSISFMY CDR.sub.L2 of gpA33 mAb 1 (SEQ ID NO: 183): DTSNLAS CDR.sub.L3 of gpA33 mAb 1 (SEQ ID NO: 184): QQWSSYPLT

(163) The VL Domain of gpA33 mAb 1 is preferably encoded by a polynucleotide (SEQ ID NO:185) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(164) TABLE-US-00054 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaag

(165) The amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186) is shown below (CDR residues are shown underlined):

(166) TABLE-US-00055 QVQLVQSGAE VKKPGASVKV SCKASGYTFT GSWMNWVRQA PGQGLEWIGR IYPGDGETNY NGKFKDRVTI TADKSTSTAY MELSSLRSED TAVYYCARIY GNNVYFDVWG QGTTVTVSS CDR.sub.H1 of gpA33 mAb 1 (SEQ ID NO: 187): GYTFTGSWMN CDR.sub.H2 of gpA33 mAb 1 (SEQ ID NO: 188): RIYPGDGETNYNGKFKD CDR.sub.H3 of gpA33 mAb 1 (SEQ ID NO: 189): IYGNNVYFDV

(167) The VH Domain of gpA33 mAb 1 is preferably encoded by a polynucleotide (SEQ ID NO:190) having the sequence shown below (polynucleotides encoding the CDRs are shown in underline):

(168) TABLE-US-00056 caggtccagc tggtccagag cggggccgaa gtcaaaaaac ccggagcaag cgtgaaggtc tcctgcaaag catcaggcta tacatttaca ggcagctgga tgaactgggt gaggcaggct ccaggacagg gactggagtg gatcgggcgc atctaccctg gagacggcga aactaactat aatggaaagt tcaaagaccg agtgaccatc acagccgata agtctactag taccgcctac atggagctga gctccctgcg gtctgaagat accgccgtct actattgcgc tagaatttac ggaaacaatg tctattttga cgtgtggggg cagggaacaa ctgtgactgt ctcctcc

(169) 7. Her2-Binding Domains

(170) The invention also particularly contemplates the selection of Her2 as a Cancer Antigen, and the use of anti-Her2 antibodies to provide the Cancer Antigen-Binding Domain of the Tri-Specific Binding Molecules of the present invention. Exemplary anti-Her2 antibodies include “Her2 mAb 1” and Trastuzumab.

(171) a. Her2 mAb 1

(172) The amino acid sequence of the VL Domain of anti-Her2 antibody “Her2 mAb 1” (SEQ ID NO:191) is shown below (CDR residues are shown underlined):

(173) TABLE-US-00057 DIQMTQSPSS LSASVGDRVT ITCRASQDVN TAVAWYQQKP GKAPKLLIYS ASFLESGVPS RFSGSRSGTD FTLTISSLQP EDFATYYCQQ HYTTPPTFGQ GTKVEIKRT

(174) The amino acid sequence of the VH Domain of anti-Her2 antibody “Her2 mAb 1” (SEQ ID NO:192) is shown below (CDR residues are shown underlined):

(175) TABLE-US-00058 QVQLQQSGPE LVKPGASLKL SCTASGFNIK DTYIHWVKQR PEQGLEWIGR IYPTNGYTRY DPKFQDKATI TADTSSNTAY LQVSRLTSED TAVYYCSRWG GDGFYAMDYW GQGASVTVSS

(176) b. Trastusumab

(177) The amino acid sequence of the VL Domain of the humanized anti-Her2 antibody “Trastuzumab” (SEQ ID NO:193) is shown below (CDR residues are shown underlined):

(178) TABLE-US-00059 DIQMTQSPSS LSASVGDRVT ITCRASQDVN TAVAWYQQKP GKAPKLLIYS ASFLYSGVPS RFSGSRSGTD FTLTISSLQP EDFATYYCQQ HYTTPPTFGQ GTKVEIKR

(179) The amino acid sequence of the VH Domain of the humanized anti-Her2 antibody “Trastuzumab” (SEQ ID NO:194) is shown below (CDR residues are shown underlined):

(180) TABLE-US-00060 EVQLVESGGG LVQPGGSLRL SCAASGFNIK DTYIHWVRQA PGKGLEWVAR IYPTNGYTRY ADSVKGRFTI SADTSKNTAY LQMNSLRAED TAVYYCSRWG GDGFYAMDYW GQGTLVTVSS 

(181) 8. B7-H3-Binding Domains

(182) In addition to its expression on neuroblastoma cells, human B7-H3 is also known to be expressed on a variety of other cancer cells (e.g., gastric, ovarian and non-small cell lung cancers). B7-H3 protein expression has been immunohistologically detected in tumor cell lines (Chapoval, A. et al. (2001) “B7-H3: A Costimulatory Molecule For T Cell Activation and IFN-γ Production,” Nature Immunol. 2:269-274; Saatian, B. et al. (2004) “Expression Of Genes For B7-H3 And Other T Cell Ligands By Nasal Epithelial Cells During Differentiation And Activation,” Amer. J. Physiol. Lung Cell. Mol. Physiol. 287:L217-L225; Castriconi et al. (2004) “Identification Of 4Ig-B7-H3 As A Neuroblastoma-Associated Molecule That Exerts A Protective Role From An NK Cell-Mediated Lysis,” Proc. Natl. Acad. Sci. (U.S.A.) 101(34):12640-12645); Sun, M. et al. (2002) “Characterization of Mouse and Human B7-H3 Genes,” J. Immunol. 168:6294-6297). mRNA expression has been found in heart, kidney, testes, lung, liver, pancreas, prostate, colon, and osteoblast cells (Collins, M. et al. (2005) “The B7 Family Of Immune-Regulatory Ligands,” Genome Biol. 6:223.1-223.7). At the protein level, B7-H3 is found in human liver, lung, bladder, testis, prostate, breast, placenta, and lymphoid organs (Hofmeyer, K. et al. (2008) “The Contrasting Role Of B7-H3,” Proc. Natl. Acad. Sci. (U.S.A.) 105(30):10277-10278).

(183) The invention also particularly contemplates the selection of B7-H3 as a Cancer Antigen, and the use of anti-B7-H3 antibodies to provide the Cancer Antigen-Binding Domain of the Tri-Specific Binding Molecules of the present invention. Exemplary anti-B7-H3 antibodies include “B7-H3 mAb 1,” “B7-H3 mAb 2,” and “B7-H3 mAb 3.”

(184) a. B7-H3 mAb 1

(185) The amino acid sequence of the VL Domain of anti-B7-H3 antibody “B7-H3 mAb 1” (SEQ ID NO:195) is shown below (CDR residues are shown underlined):

(186) TABLE-US-00061 DIAMTQSQKF MSTSVGDRVS VTCKASQNVD TNVAWYQQKP GQSPKALIYS ASYRYSGVPD RFTGSGSGTD FTLTINNVQS EDLAEYFCQQ YNNYPFTFGS GTKLEIK 

(187) The amino acid sequence of the VH Domain of anti-B7-H3 antibody “B7-H3 mAb 1” (SEQ ID NO:196) is shown below (CDR residues are shown underlined):

(188) TABLE-US-00062 DVQLVESGGG LVQPGGSRKL SCAASGFTFS SFGMHWVRQA PEKGLEWVAY ISSDSSAIYY ADTVKGRFTI SRDNPKNTLF LQMTSLRSED TAMYYCGRGR ENIYYGSRLD YWGQGTTLTV SS 

(189) b. B7-H3 mAb 2

(190) The amino acid sequence of the VL Domain of anti-B7-H3 antibody “B7-H3 mAb 2” (SEQ ID NO:197) is shown below (CDR residues are shown underlined):

(191) TABLE-US-00063 DIQMTQTTSS LSASLGDRVT ISCRASQDIS NYLNWYQQKP DGTVKLLIYY TSRLHSGVPS RFSGSGSGTD YSLTIDNLEQ EDIATYFCQQ GNTLPPTFGG GTKLEIK 

(192) The amino acid sequence of the VH Domain of anti-B7-H3 antibody “B7-H3 mAb 2” (SEQ ID NO:198) is shown below (CDR residues are shown underlined):

(193) TABLE-US-00064 QVQLQQSGAE LARPGASVKL SCKASGYTFT SYWMQWVKQR PGQGLEWIGT IYPGDGDTRY TQKFKGKATL TADKSSSTAY MQLSSLASED SAVYYCARRG IPRLWYFDVW GAGTTVTVSS 

(194) c. B7-H3 mAb 3

(195) The amino acid sequence of the VL Domain of anti-B7-H3 antibody “B7-H3 mAb 3” (SEQ ID NO:199) is shown below (CDR residues are shown underlined):

(196) TABLE-US-00065 DIQMTQSPAS LSVSVGETVT ITCRASESIY SYLAWYQQKQ GKSPQLLVYN TKTLPEGVPS RFSGSGSGTQ FSLKINSLQP EDFGRYYCQH HYGTPPWTFG GGTNLEIK 

(197) The amino acid sequence of the VH Domain of anti-B7-H3 antibody “B7-H3 mAb 3” (SEQ ID NO:200) is shown below (CDR residues are shown underlined):

(198) TABLE-US-00066 EVQQVESGGD LVKPGGSLKL SCAASGFTFS SYGMSWVRQT PDKRLEWVAT INSGGSNTYY PDSLKGRFTI SRDNAKNTLY LQMRSLKSED TAMYYCARHD GGAMDYWGQG TSVTVSS 

(199) 9. EGF Receptor-Binding Domains (Cetuximab)

(200) The amino acid sequence of the VL Domain of the chimeric anti-EGFR antibody “Cetuximab” (SEQ ID NO:201) is shown below (CDR residues are shown underlined):

(201) TABLE-US-00067 DILLTQSPVI LSVSPGERVS FSCRASQSIG TNIHWYQQRT NGSPRLLIKY ASESISGIRS RFSGSGSGTD FTLSINSVES EDIADYYCQQ NNNWPTTFGA GTKLELKR 

(202) The amino acid sequence of the VH Domain of the chimeric anti-EGFR antibody “Cetuximab” (SEQ ID NO:202) is shown below (CDR residues are shown underlined):

(203) TABLE-US-00068 QVQLKQSGPG LVQPSQSLSI TCTVSGFSLT NYGVHWVRQS PGKGLEWLGV IWSGGNTDYN TPFTSRLSIN KDNSKSQVFF KMNSLQSNDT AIYYCARALT YYDYEFAYWG QGTLVTVSA 

(204) Panitumumab (e.g., VECTIBIX®, Amgen) is an alternative EGF receptor-binding antibody that may be used in accordance with the present invention.

(205) 10. VEGF-Binding Domains (Bevacizumab)

(206) The amino acid sequence of the VL Domain of the humanized anti-VEGF antibody “Bevacizumab” (SEQ ID NO:203) is shown below (CDR residues are shown underlined):

(207) TABLE-US-00069 DIQMTQSPSS LSASVGDRVT ITCSASQDIS NYLNWYQQKP GKAPKVLIYF TSSLHSGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YSTVPWTFGQ GTKVEIKR 

(208) The amino acid sequence of the VH Domain of the humanized anti-VEGF antibody “Bevacizumab” (SEQ ID NO:204) is shown below (CDR residues are shown underlined):

(209) TABLE-US-00070 EVQLVESGGG LVQPGGSLRL SCAASGYTFT NYGMNWVRQA PGKGLEWVGW INTYTGEPTY AADFKRRFTF SLDTSKSTAY LQMNSLRAED TAVYYCAKYP HYYGSSHWYF DVWGQGTLVT VSS 

(210) 11. 5T4-Binding Domains

(211) The oncofetal protein, 5T4, is a tumor-associated protein displayed on the cell membrane of many carcinomas, including kidney, colon, prostate, lung, carcinoma and in acute lymphoblastic leukemia (see, Boghaert, E. R. et al. (2008) “The Oncofetal Protein, 5T4, Is A Suitable Target For Antibody-Guided Anti-Cancer Chemotherapy With Calicheamicin,” Int. J. Oncol. 32(1):221-234; Eisen, T. et al. (2014) “Naptumomab Estafenatox: Targeted Immunotherapy with a Novel Immunotoxin,” Curr. Oncol. Rep. 16:370, pp. 1-6). The amino acid sequence of the Light Chain Variable Domain of an exemplary anti-5T4 antibody (“5T4 mAb 1”) is shown below (CDR residues are shown underlined): (SEQ ID NO:308):

(212) TABLE-US-00071 DIQMTQSPSS LSASVGDRVT ITCRASQGIS NYLAWFQQKP GKAPKSLIYR ANRLQSGVPS RFSGSGSGTD FTLTISSLQP EDVATYYCLQ YDDFPWTFGQ GTKLEIK 

(213) The amino acid sequence of the Heavy Chain Variable Domain of such exemplary anti-5T4 antibody is shown below (CDR residues are shown underlined): (SEQ ID NO:309):

(214) TABLE-US-00072 QVQLVQSGAE VKKPGASVKV SCKASGYTFT SFWMHWVRQA PGQGLEWMGR IDPNRGGTEY NEKAKSRVTM TADKSTSTAY MELSSLRSED TAVYYCAGGN PYYPMDYWGQ GTTVTVSS 

(215) The amino acid sequence of the Light Chain Variable Domain of a second exemplary anti-5T4 antibody (“5T4 mAb 2”) is shown below (CDR residues are shown underlined): (SEQ ID NO:310):

(216) TABLE-US-00073 DVLMTQTPLS LPVSLGDQAS ISCRSSQSIV YSNGNTYLEW YLQKPGQSPK LLIYKVSNRF SGVPDRFSGS GSGTDFTLKI SRVEAEDLGV YYCFQGSHVP FTFGSGTKLE IK 

(217) The amino acid sequence of the Heavy Chain Variable Domain of such second exemplary anti-5T4 antibody is shown below (CDR residues are shown underlined) (SEQ ID NO:311):

(218) TABLE-US-00074 QVQLQQPGAE LVKPGASVKM SCKASGYTFT SYWITWVKQR PGQGLEWIGD IYPGSGRANY NEKFKSKATL TVDTSSSTAY MQLSSLTSED SAVYNCARYG PLFTTVVDPN SYAMDYWGQG TSVTVSS 

(219) 12. IL13Rα2-Binding Domains

(220) Interleukin-13 Receptor α2 (IL13Rα2) is overexpressed in a variety of cancers, including glioblastoma, colorectal cancer, cervical cancer, pancreatic cancer, multiple melanoma, osteosarcoma, leukemia, lymphoma, prostate cancer and lung cancer (PCT Pubmication No. WO 2008/146911;

(221) Brown, C. E. et al. (2013) “Glioma IL13Rα2 Is Associated With Mesenchymal Signature Gene Expression And Poor Patient Prognosis,” PLoS One. 18; 8(10):e77769; Barderas, R. et al. (2012) “High Expression Of IL-13 Receptor A2 In Colorectal Cancer Is Associated With Invasion, Liver Metastasis, And Poor Prognosis,” Cancer Res. 72(11):2780-2790; Kasaian, M. T. et al. (2011) “IL-13 Antibodies Influence IL-13 Clearance In Humans By Modulating Scavenger Activity Of IL-13Rα2,” J. Immunol. 187(1):561-569; Bozinov, O. et al. (2010) “Decreasing Expression Of The Interleukin-13 Receptor IL-13Ralpha2 In Treated Recurrent Malignant Gliomas,” Neurol. Med. Chir. (Tokyo) 50(8):617-621; Fujisawa, T. et al. (2009) “A novel role of interleukin-13 receptor alpha2 in pancreatic cancer invasion and metastasis,” Cancer Res. 69(22):8678-8685). Antibodies that immunospecifically bind to IL13Rα2 are commercially available (Abnova Corporation, Biorbyt, LifeSpan BioSciences, United States Biologicals; see also PCT Publication No. WO 2008/146911). The amino acid sequence of the Light Chain Variable Domain of an exemplary anti-IL13Rα2 antibody (“hu08,” PCT Publication No. WO 2014/072888) is shown below (CDR residues are shown underlined): (SEQ ID NO:321):

(222) TABLE-US-00075 DIQMTQSPSS LSASVGDRVT ITCKASQDVG TAVAWYQQKP GKAPKLLIYS ASYRSTGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQH HYSAPWTFGG GTKVEIK

(223) The amino acid sequence of the Heavy Chain Variable Domain of such exemplary anti-IL13Rα2 antibody (“hu08,” PCT Publication No. WO 2014/072888) is shown below (CDR residues are shown underlined): (SEQ ID NO:322):

(224) TABLE-US-00076 EVQLVESGGG LVQPGGSLRL SCAASGFTFS RNGMSWVRQA PGKGLEWVAT VSSGGSYIYY ADSVKGRFTI SRDNAKNSLY LQMNSLRAED TAVYYCARQG TTALATRFFD VWGQGTLVTV SS

(225) 13. Integrin Beta6-Binding Domains

(226) Integrinβ6 (ITGB6) is a subtype of integrin that is expressed exclusively on the surfaces of epithelial cells and is a receptor for extracellular matrix (ECM) proteins. ITGB6 expression is specifically expressed in tumor tissues (such as those of colon, prostate, kidney cancer), but is generally undetectable in healthy epithelial tissue (Liang, B. et al. (2014) “Integrinβ6-targeted Immunoliposomes Mediate Tumor Specific Drug Delivery and Enhance Therapeutic Efficacy in Colon Carcinoma,” Clin. Cancer Res. December 30. pii: clincanres.1194.2014). Monoclonal antibodies that immunospecifically bind to ITGB6 are available commercially (e.g., MAB2075Z clone R6G9,EMD Millipore; see also, Weinacker, A. et al. (1994) “Role Of The Integrin Alpha V Beta 6 In Cell Attachment To Fibronectin. Heterologous Expression Of Intact And Secreted Forms Of The Receptor,” J. Biol. Chem. 269:6940-6948). Anti-ITGB6 monoclonal antibodies 3G9 and 8G6, and variants thereof are disclosed in PCT Publication Nos. WO 03/100033 and WO 2007/008712.

(227) The amino acid sequence of the Light Chain Variable Domain of an exemplary humanized anti-ITGB6 antibody (derived from antibody 3G9, PCT Publication No. WO 2007/008712) is shown below (CDR residues are shown underlined): (SEQ ID NO:312):

(228) TABLE-US-00077 EIVLTQSPAT LSLSPGERAT LSCSASSSVS SSYLYWYQQK PGQAPRLLIY STSNLASGIP ARFSGSGSGT GFTLTISSLE PEDFAVYYCH QWSTYPPTFG GGTKVEIK

(229) The amino acid sequence of the Heavy Chain Variable Domain of such exemplary humanized anti-ITGB6 antibody (derived from antibody 3G9, PCT Publication No. WO 2007/008712) is shown below (CDR residues are shown underlined): (SEQ ID NO:313):

(230) TABLE-US-00078 EVQLVESGGG LVQPGGSLRL SCAASGFTFS RYWMSWVRQA PGKGLEWVAS ISSGGRMYYP FTVKGRFTIS RDNAKNSLYL QMNSLRAEDT AVYYCARGSI YDGYYVFPYW GQGTLVTVSS

(231) The amino acid sequence of the Light Chain Variable Domain of an exemplary anti-ITGB6 antibody (derived from antibody 8G6, PCT Publication No. WO 2007/008712) is shown below (CDR residues are shown underlined): (SEQ ID NO:314):

(232) TABLE-US-00079 EIVLTQSPAT LSLSPGERAT LSCRASQSVS TSSYSYMYWY QQKPGQAPRL LIYYASNLES GIPARFSGSG SGTDFTLTIS SLEPEDFAVY YCQHNWEIPF TFGGGTKVEI K

(233) The amino acid sequence of the Heavy Chain Variable Domain of such exemplary anti-ITGB6 antibody (derived from antibody 8G6, PCT Publication No. WO 2007/008712) is shown below (CDR residues are shown underlined): (SEQ ID NO:315):

(234) TABLE-US-00080 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYAMHWVRQAPGQGLEWMGV ISTYYGNTNYNQKFKGRVTMTRDTSISTAYMELSRLRSDDTAVYYCARGG LRRGDRPSLQYAMDYWGQGTLVTVSS

(235) 14. Additional Anti-Cancer Antigen-Binding Domains

(236) Additional anti-cancer antigen antibodies that may be used in accordance with the present invention include the following commercially available antibodies: Brentuximab (e.g., ADCETRIS®), which binds to CD30; Gemtuzumab (e.g., MYLOTARG®, Wyeth), which binds to CD33; and Ipilimumab (e.g., YERVOY®), which binds to CTLA-4.

C. Exemplary Effector Cell-Binding Domains

(237) Antibodies that are capable of binding to immune system effector cells may be used to provide the Effector Cell-Binding Domains of the Tri-Specific Binding Molecules of the present invention. Particularly suitable are antibodies that bind to CD2, CD3, CD16, CD19, CD20, CD22, CD32B, CD64, the B cell Receptor (BCR), the T cell Receptor (TCR), and the NKG2D Receptor.

(238) 1. CD2-Binding Domains

(239) CD2 is a cell adhesion molecule found on the surface of T cells and natural killer (NK) cells. CD2 enhances NK cell cytotoxicity, possibly as a promoter of NK cell nanotube formation (Mace, E. M. et al. (2014) “Cell Biological Steps And Checkpoints In Accessing NK Cell Cytotoxicity,” Immunol. Cell. Biol. 92(3):245-255; Comerci, C. J. et al. (2012) “CD2 Promotes Human Natural Killer Cell Membrane Nanotube Formation,” PLoS One 7(10):e47664:1-12). The amino acid sequence of the VL Domain of anti-CD2 antibody (Lo-CD2a; ATCC Accession No: 11423) is (SEQ ID NO:102) (CDR residues are shown underlined):

(240) TABLE-US-00081 DVVLTQTPPT LLATIGQSVS ISCRSSQSLL HSSGNTYLNW LLQRTGQSPQ PLIYLVSKLE SGVPNRFSGS GSGTDFTLKI SGVEAEDLGV YYCMQFTHYP YTFGAGTKLE LK

(241) The amino acid sequence of the VH Domain of anti-CD2 antibody (Lo-CD2a; ATCC Accession No: 11423) is (SEQ ID NO:103) (CDR residues are shown underlined):

(242) TABLE-US-00082 EVQLQQSGPE LQRPGASVKL SCKASGYIFT EYYMYWVKQR PKQGLELVGR IDPEDGSIDY VEKFKKKATL TADTSSNTAY MQLSSLTSED TATYFCARGK FNYRFAYWGQ GTLVTVSS

(243) 2. CD3-Binding Domains

(244) In a preferred embodiment, the second epitope that is bound by the Tri-Specific Binding Molecules of the present invention will be an epitope of CD3. CD3 is a T cell co-receptor composed of four distinct chains (Wucherpfennig, K. W. et al. (2010) “Structural Biology Of The T-Cell Receptor: Insights Into Receptor Assembly, Ligand Recognition, And Initiation Of Signaling,” Cold Spring Harb. Perspect. Biol. 2(4):a005140; pages 1-14). In mammals, the complex contains a CD3γ chain, a CD3δ chain, and two CD3ε chains. These chains associate with a molecule known as the T cell receptor (TCR) in order to generate an activation signal in T lymphocytes. In the absence of CD3, TCRs do not assemble properly and are degraded (Thomas, S. et al. (2010) “Molecular Immunology Lessons From Therapeutic T-Cell Receptor Gene Transfer,” Immunology 129(2):170-177). CD3 is found bound to the membranes of all mature T cells, and in virtually no other cell type (see, Janeway, C. A. et al. (2005) In: IMMUNOBIOLOGY: THE IMMUNE SYSTEM IN HEALTH AND DISEASE,” 6th ed. Garland Science Publishing, NY, pp. 214-216; Sun, Z. J. et al. (2001) “Mechanisms Contributing To T Cell Receptor Signaling And Assembly Revealed By The Solution Structure Of An Ectodomain Fragment Of The CD3ε:γ Heterodimer,” Cell 105(7):913-923; Kuhns, M. S. et al. (2006) “Deconstructing The Form And Function Of The TCR/CD3 Complex,” Immunity. 2006 February; 24(2): 133-139).

(245) As discussed below, in order to illustrate the present invention, bi-specific anti-human CD3×anti-human DR5-binding molecules were produced. An anti-human CD3 antibody used for such constructs is designated herein as “CD3 mAb 2.” The amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104) is shown below (CDR residues are shown underlined):

(246) TABLE-US-00083 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG CDR.sub.L1 of CD3 mAb 2 (SEQ ID NO: 105): RSSTGAVTTSNYAN CDR.sub.L2 of CD3 mAb 2 (SEQ ID NO: 106): GTNKRAP CDR.sub.L3 of CD3 mAb 2 (SEQ ID NO: 107): ALWYSNLWV

(247) The amino acid sequence of the VH Domain of CD3 mAb 2 (SEQ ID NO:108) is shown below (CDR residues are shown underlined):

(248) TABLE-US-00084 EVQLVESGGG LVQPGGSLRL SCAASGFTFS TYAMNWVRQA PGKGLEWVGR IRSKYNNYAT YYADSVK RF TISRDDSKNS LYLQMNSLKT EDTAVYYCVR HGNFGNSYVS WFAYWGQGTL VTVSS CDR.sub.H1 of CD3 mAb 2 (SEQ ID NO: 109): TYAMN CDR.sub.H2 of CD3 mAb 2 (SEQ ID NO: 110): RIRSKYNNYATYYADSVK CDR.sub.H3 of CD3 mAb 2 (SEQ ID NO: 111): HGNFGNSYVSWFAY

(249) In some of the CD3 constructs, a variant VH Domain was employed for CD3 mAb 2. The variant VH domain possesses a D65G substitution, thus having the amino acid sequence shown below (SEQ ID NO:112) (CDR residues are shown underlined):

(250) TABLE-US-00085 EVQLVESGGG LVQPGGSLRL SCAASGFTFS TYAMNWVRQA PGKGLEWVGR IRSKYNNYAT YYADSVK RF TISRDDSKNS LYLQMNSLKT EDTAVYYCVR HGNFGNSYVS WFAYWGQGTL VTVSS

(251) The substitution causes the CDR.sub.H2 to have the amino acid sequence (SEQ ID NO:113) RIRSKYNNYATYYADSVKG. The substituted position (D65G) is shown in double underline.

(252) A second anti-CD3 antibody used herein is antibody Muromonab-CD3 “OKT3” (Xu et al. (2000) “In Vitro Characterization Of Five Humanized OKT3 Effector Function Variant Antibodies,” Cell. Immunol. 200:16-26); Norman, D. J. (1995) “Mechanisms Of Action And Overview Of OKT3,” Ther. Drug Monit. 17(6):615-620; Canafax, D. M. et al. (1987) “Monoclonal Antilymphocyte Antibody (OKT3) Treatment Of Acute Renal Allograft Rejection,” Pharmacotherapy 7(4):121-124; Swinnen, L. J. et al. (1993) “OKT3 Monoclonal Antibodies Induce Interleukin-6 And Interleukin-10: A Possible Cause Of Lymphoproliferative Disorders Associated With Transplantation,” Curr. Opin. Nephrol. Hypertens. 2(4):670-678). The amino acid sequence of the VL Domain of OKT3 (SEQ ID NO:114) is shown below (CDR residues are shown underlined):

(253) TABLE-US-00086 QIVLTQSPAI MSASPGEKVT MTCSASSSVS YMNWYQQKSG TSPKRWIYDT SKLASGVPAH FRGSGSGTSY SLTISGMEAE DAATYYCQQW SSNPFTFGSG TKLEINR

(254) The amino acid sequence of the VH Domain of OKT3 (SEQ ID NO:115) is shown below (CDR residues are shown underlined):

(255) TABLE-US-00087 QVQLQQSGAE LARPGASVKM SCKASGYTFT RYTMHWVKQR PGQGLEWIGY INPSRGYTNY NQKFKDKATL TTDKSSSTAY MQLSSLTSED SAVYYCARYY DDHYCLDYWG QGTTLTVSS

(256) 3. CD16-Binding Domains

(257) CD16 is the FcγRIIIA receptor. CD16 is expressed by neutrophils, eosinophils, natural killer (NK) cells, and tissue macrophages that bind aggregated but not monomeric human IgG (Peltz, G. A. et al. (1989) “Human Fc Gamma RIII: Cloning, Expression, And Identification Of The Chromosomal Locus Of Two Fc Receptors For IgG,” Proc. Natl. Acad. Sci. (U.S.A.) 86(3):1013-1017; Bachanova, V. et al. (2014) “NK Cells In Therapy Of Cancer,” Crit. Rev. Oncog. 19(1-2):133-141; Miller, J. S. (2013) “Therapeutic Applications: Natural Killer Cells In The Clinic,” Hematology Am. Soc. Hematol. Educ. Program. 2013:247-253; Youinou, P. et al. (2002) “Pathogenic Effects Of Anti-Fc Gamma Receptor IIIB (CD16) On Polymorphonuclear Neutrophils In Non-Organ-Specific Autoimmune Diseases,” Autoimmun Rev. 1(1-2):13-19; Peipp, M. et al. (2002) “Bi-specific Antibodies Targeting Cancer Cells,” Biochem. Soc. Trans. 30(4):507-511).

(258) The amino acid sequence of a Variable Light Chain Domain of anti-CD16 antibody 3G8 is (SEQ ID NO:116) (CDR residues are shown underlined):

(259) TABLE-US-00088 DTVLTQSPAS LAVSLGQRAT ISCKASQSVD FDGDSFMNWY QQKPGQPPKL LIYTTSNLES GIPARFSASG SGTDFTLNIH PVEEEDTATY YCQQSNEDPY TFGGGTKLEI K

(260) The amino acid sequence of the Variable Heavy Chain Domain of anti-CD16 antibody 3G8 is (SEQ ID NO:117) (CDR residues are shown underlined):

(261) TABLE-US-00089 QVTLKESGPG ILQPSQTLSL TCSFSGFSLR TSGMGVGWIR QPSGKGLEWL AHIWWDDDKR YNPALKSRLT ISKDTSSNQV FLKIASVDTA DTATYYCAQI NPAWFAYWGQ GTLVTVSA

(262) The amino acid sequence of a Variable Light Chain Domain of anti-CD16 antibody A9 is (SEQ ID NO:118) (CDR residues are shown underlined):

(263) TABLE-US-00090 DIQAVVTQES ALTTSPGETV TLTCRSNTGT VTTSNYANWV QEKPDHLFTG LIGHTNNRAP GVPARFSGSL IGDKAALTIT GAQTEDEAIY FCALWYNNHW VFGGGTKLTVL

(264) The amino acid sequence of the Variable Heavy Chain Domain of anti-CD16 antibody A9 is (SEQ ID NO:119) (CDR residues are shown underlined):

(265) TABLE-US-00091 QVQLQQSGAE LVRPGTSVKI SCKASGYTFT NYWLGWVKQR PGHGLEWIGD IYPGGGYTNY NEKFKGKATV TADTSSRTAY VQVRSLTSED SAVYFCARSA SWYFDVWGAR TTVTVSS

(266) 4. CD19-Binding Domains

(267) CD19 antigen is a type I transmembrane glycoprotein belonging to the immunoglobulin Ig superfamily. CD19 is expressed on follicular dendritic cells and B cells. It is considered a pan B cell marker expressed throughout B cell development but with threefold higher expression in mature cells as compared to immature B cells (Raufi A. et al. (2013) “Targeting CD19 In B-Cell Lymphoma: Emerging Role Of SAR3419,” Cancer Manag. Res. 5:225-233). Many CD19 antibodies have been described (e.g., MD1342, MEDI-551, etc.) (Mei, H. E. et al. (2012) “Rationale Of Anti-CD19 Immunotherapy: An Option To Target Autoreactive Plasma Cells In Autoimmunity,” Arthritis Res. Ther. 14(Suppl 5):S1:1-16). The anti-CD19 binding molecule “blinatumomab” is disclosed in EP 2186527.

(268) The amino acid sequence of the VL Domain of a preferred anti-CD19 antibody (HD37) is (SEQ ID NO:120) (CDR residues are shown underlined):

(269) TABLE-US-00092 DILITQSPKS MSMSVGERVT LTCKASENVV TYVSWYQQKP EQSPKLLIYG ASNRYTGVPD RFTGSGSATD FTLTISSVQA EDLADYHCGQ GYSYPYTFGG GTKLEIKR

(270) The amino acid sequence of the VH Domain of anti-CD19 antibody HD37 is (SEQ ID NO:121) (CDR residues are shown underlined):

(271) TABLE-US-00093 QVQLQQSGAE LVRPGSSVKI SCKASGYAFS SYWMNWVKQR PGQGLEWIGQ IWPGDGDTNY NGKFKGKATL TADESSSTAY MQLSSLASED SAVYFCARRE TTTVGRYYYA MDYWGQGTSV TVSS

(272) 5. CD20-Binding Domains

(273) CD20 is a B cell-specific differentiation antigen that is expressed on mature B cells and in most B cell non-Hodgkin's lymphomas but not on early B cell progenitors or later mature plasma cells (Maloney, D. G. (2012) “Anti-CD20 Antibody Therapy for B-Cell Lymphomas,” N. Engl. J. Med. 366:2008-2016). Rituximab is an illustrative anti-human CD20 antibody. The amino acid sequence of the VL Domain of a chimeric anti-CD20 antibody (rituximab) is (SEQ ID NO:122) (CDR residues are shown underlined):

(274) TABLE-US-00094 QIVLSQSPAI LSASPGEKVT MTCRASSSVS YIHWFQQKPG SSPKPWIYAT SNLASGVPVR FSGSGSGTSY SLTISRVEAE DAATYYCQQW TSNPPTFGGG TKLEIKR

(275) The amino acid sequence of the VH Domain of anti-CD20 antibody (rituximab) is (SEQ ID NO:123) (CDR residues are shown underlined):

(276) TABLE-US-00095 QVQLQQPGAE LVKPGASVKM SCKASGYTFT SYNMHWVKQT PGRGLEWIGA IYPGNGDTSY NQKFKGKATL TADKSSSTAY MQLSSLTSED SAVYYCARST YYGGDWYFNV WGAGTTVTVS A

(277) Alternative anti-CD20 antibodies that may be used in accordance with the present invention include the following commercially available antibodies: Ibritumomab (e.g., ZEVALIN®, Spectrum Pharmaceuticals, Inc.), Ofatumumab (e.g., ARZERRA®, SmithKlineGlaxo) and Tositumomab (e.g., BEXXAR®,GlaxoSmithKline).

(278) 6. CD22-Binding Domains

(279) CD22 is a sugar binding transmembrane protein found on the surface of mature B cells and to a lesser extent on some immature B cells (WO 2011/032633; Poe, J. C. et al. (2012) “CD22 And Siglec-G In B Cell Function And Tolerance,” Trends Immunol. 33(8):413-420; Chen, W. C. et al. (2012) “Targeting B Lymphoma With Nanoparticles Bearing Glycan Ligands Of CD22,” Leuk. Lymphoma 53(2):208-210; Walker, J. A. (2008) “CD22: An Inhibitory Enigma,” Immunology 123(3):314-325; Coleman, M. et al. (2003) “Epratuzumab: Targeting B-Cell Malignancies Through CD22,” Clin. Cancer Res. 9(10 Pt 2):39915-39945).

(280) The amino acid sequence of the VL Domain of anti-CD22 antibody (epratuzumab) is (SEQ ID NO:124) (CDR residues are shown underlined):

(281) TABLE-US-00096 DIQLTQSPSS LSASVGDRVT MSCKSSQSVL YSANHKNYLA WYQQKPGKAP KLLIYWASTR ESGVPSRFSG SGSGTDFTFT ISSLQPEDIA TYYCHQYLSS WTFGGGTKVQ IKR

(282) The amino acid sequence of the VH Domain of anti-CD22 antibody (epratuzumab) is (SEQ ID NO:125) (CDR residues are shown underlined):

(283) TABLE-US-00097 QVQLVQSGAE VKKPGSSVKV SCKASGYTFT SYWLHWVRQA PGQGLEWIGY INPRNDYTEY NQNFKDKATI TADESTNTAY MELSSLRSED TAFYFCARRD ITTFYWGQGT TVTVSS

(284) 7. CD32B-Binding Domains

(285) A preferred sequence for the VL domain of an antibody that binds to human CD32B is CD32B mAb 1 (SEQ ID NO:126) (CDR residues are shown underlined):

(286) TABLE-US-00098 DIQMTQSPSS LLAALGERVS LTCRASQEIS GYLSWLQQKP DGTIKRLIYA ASTLDSGVPK RFSGSESGSD YSLTISSLES EDFADYYCLQ YFSYPLTFGA GTKLELK

(287) A preferred sequence for the VH domain of the CD32B mAb 1 antibody that binds to human CD32B is (SEQ ID NO:127) (CDR residues are shown underlined):

(288) TABLE-US-00099 EVKLEESGGG LVQPGGSMKL SCEASGFTFS DAWMDWVRQS PEKGLEWVAE IRNKAKNHAT YYAESVIGRF TISRDDSKSS VYLQMNSLRA EDTGIYYCGA LGLDYWGQGT TLTVSS

(289) 8. CD64-Binding Domains

(290) CD64 is the FcγRI receptor and is expressed on monocytes/macrophages, dendritic cells, and activated granulocytes. The expression can be upregulated by IFN-γ stimulation. CD64 binds IgG immune complex. CD64 plays a role in antigen capture, phagocytosis of IgG/antigen complexes, and antibody-dependent cellular cytotoxicity (WO 2006/002438).

(291) A preferred sequence for the VL domain of an antibody that binds to human CD64 is CD64 mAb 1 (SEQ ID NO:128) (CDR residues are shown underlined):

(292) TABLE-US-00100 EIVLTQSPAT LSLSPGERAT LSCRASQSVS SYLAWYQQKP GQAPRLLIYD ASSRATGIPA RFGGSGSGGT DFTLTISSLE PEDFAVYYCQ LRSNWPPYTF GQGTKLEIK

(293) A preferred sequence for the VH domain of an antibody that binds to human CD64 is (SEQ ID NO:129) (CDR residues are shown underlined):

(294) TABLE-US-00101 QVQLVESGGG VVQPGRSLRL SCAASGFIFS GYGMHWVRQA PGKGLEWVTV IWYDGSNKYY ADSVKGRFTI SRDNSKNTLY LQMNSLRAED TAVYYCARDT GDRFFDYWGQ GTLVTVSS

(295) 9. BCR/CD79-Binding Domains

(296) The BCR is composed of a membrane immunoglobulin which, together with non-covalently associated α and β subunits of CD79 (“CD79a” and “CD79b,” respectively), forms the BCR complex. CD79a and CD79b are signal transducing subunits that contain a conserved immunoreceptor tyrosine-based activation motif (“ITAM”) required for signal transduction (Dylke, J. et al. (2007) “Role Of The Extracellular And Transmembrane Domain Of Ig-Alpha/Beta In Assembly Of The B Cell Antigen Receptor (BCR),” Immunol. Lett. 112(1):47-57; Cambier, J. C. (1995) “New Nomenclature For The Reth Motif (or ARH1/TAM/ARAM/YXXL),” Immunol. Today 16:110). Aggregation of the BCR complex by multivalent antigen initiates transphosphorylation of the CD79a and CD79b ITAMs and activation of receptor-associated kinases (DeFranco, A. L. (1997) “The Complexity Of Signaling Pathways Activated By The BCR,” Curr. Opin. Immunol. 9:296-308; Kurosaki, T. (1997) “Molecular Mechanisms In B Cell Antigen Receptor Signaling,” Curr. Opin. Immunol. 9:309-318; Kim, K. M. et al. (1993) “Signalling Function Of The B-Cell Antigen Receptors,” Immun. Rev. 132:125-146). Phosphorylated ITAMs recruit additional effectors such as PI.sub.3K, PLC-γ and members of the Ras/MAPK pathway. These signaling events are responsible for both the B cell proliferation and increased expression of activation markers (such as MHCII and CD86) that are required to prime B cells for their subsequent interactions with T helper (“T.sub.h”) cells.

(297) A preferred sequence for the VL domain of an antibody that binds to the human B Cell Receptor (CD79) is CD79 mAb 1 (SEQ ID NO:130) (CDR residues are shown underlined):

(298) TABLE-US-00102 DVVMTQTPLT LSVNIGQPAS ISCKSSQSLL DTDGKTYLNW LLQRPQGSPN RLIYLVSKLD SGVPDRFTGS GSGTDFTLKI SRVEAEDLGI YYCWQGTHFP LTFGAGTKLE LK

(299) A preferred sequence for the VH domain of the CD79 mAb 1 antibody that binds to the human B Cell Receptor (CD79) is (SEQ ID NO:131) (CDR residues are shown underlined):

(300) TABLE-US-00103 QVQLQQPGAE LVRPGASVKL SCKASGYTFT SYWMNWVKQR PGQGLEWIGM VDPSDSETHY NQMFKDKATL TVDKSSSTAY MQLSSLTSED SAVYYCARAM GYWGQGTSVT VSS

(301) 10. T Cell Receptor-Binding Domains

(302) In an alternate embodiment, the second epitope that is bound by the Tri-Specific Binding Molecules of the present invention will be an epitope of the T cell Receptor (TCR). The T cell Receptor is natively expressed by CD4+ or CD8+ T cells, and permits such cells to recognize antigenic peptides that are bound and presented by class I or class II MHC proteins of antigen presenting cells. Recognition of a pMHC (peptide-MHC) complex by a TCR initiates the propagation of a cellular immune response that leads to the production of cytokines and the lysis of the antigen presenting cell (see, e.g., Armstrong, K. M. et al. (2008) “Conformational Changes And Flexibility In T-Cell Receptor Recognition Of Peptide-MHC Complexes,” Biochem. J. 415(Pt 2):183-196; Willemsen, R. (2008) “Selection Of Human Antibody Fragments Directed Against Tumor T-Cell Epitopes For Adoptive T-Cell Therapy,” Cytometry A. 73(11):1093-1099; Beier, K. C. et al. (2007) “Master Switches Of T-Cell Activation And Differentiation,” Eur. Respir. J. 29:804-812; Mallone, R. et al. (2005) “Targeting T Lymphocytes For Immune Monitoring And Intervention In Autoimmune Diabetes,” Am. J. Ther. 12(6):534-550). CD3 is the receptor that binds to the TCR (Thomas, S. et al. (2010) “Molecular Immunology Lessons From Therapeutic T-Cell Receptor Gene Transfer,” Immunology 129(2):170-177; Guy, C. S. et al. (2009) “Organization Of Proximal Signal Initiation At The TCR:CD3 Complex,” Immunol. Rev. 232(1):7-21; St. Clair, E. W. (Epub 2009 Oct. 12) “Novel Targeted Therapies For Autoimmunity,” Curr. Opin. Immunol. 21(6):648-657; Baeuerle, P. A. et al. (Epub 2009 Jun. 9) “Bi-specific T-Cell Engaging Antibodies For Cancer Therapy,” Cancer Res. 69(12):4941-4944; Smith-Garvin, J. E. et al. (2009) “T Cell Activation,” Annu. Rev. Immunol. 27:591-619; Renders, L. et al. (2003) “Engineered CD3 Antibodies For Immunosuppression,” Clin. Exp. Immunol. 133(3):307-309).

(303) Antibodies that specifically bind to the T cell Receptor include the anti-TCR antibody BMA 031 (EP 0403156; Kurrle, R. et al. (1989) “BMA 031—A TCR-Specific Monoclonal Antibody For Clinical Application,” Transplant Proc. 21(1 Pt 1):1017-1019; Nashan, B. et al. (1987) “Fine Specificity Of A Panel Of Antibodies Against The TCR/CD3 Complex,” Transplant Proc. 19(5):4270-4272; Shearman, C. W. et al. (1991) “Construction, Expression, And Biologic Activity Of Murine/Human Chimeric Antibodies With Specificity For The Human α/β T Cell,” J. Immunol. 146(3):928-935; Shearman, C. W. et al. (1991) “Construction, Expression And Characterization of Humanized Antibodies Directed Against The Human α/β T Cell Receptor,” J. Immunol. 147(12):4366-4373).

(304) The amino acid sequence of the VL Domain of anti-TCR antibody BMA 031 is (SEQ ID NO:132) (CDR residues are shown underlined):

(305) TABLE-US-00104 EIVLTQSPAT LSLSPGERAT LSCSATSSVS YMHWYQQKPG KAPKRWIYDT SKLASGVPSR FSGSGSGTEF TLTISSLQPE DFATYYCQQW SSNPLTFGQG TKLEIK

(306) The amino acid sequence of a VH Domain of anti-TCR antibody BMA 031 is (SEQ ID NO:133) (CDR residues are shown underlined):

(307) TABLE-US-00105 QVQLVQSGAE VKKPGASVKV SCKASGYKFT SYVMHWVRQA PGQGLEWIGY INPYNDVTKY NEKFKGRVTI TADKSTSTAY LQMNSLRSED TAVHYCARGS YYDYDGFVYW GQGTLVTVSS

(308) 11. NKG2D Receptor-Binding Domains

(309) In an alternate embodiment, the second epitope that is bound by the Tri-Specific Binding Molecules of the present invention will be an epitope of the NKG2D receptor. The NKG2D receptor is expressed on all human (and other mammalian) Natural Killer cells (Bauer, S. et al. (1999) “Activation Of NK Cells And T Cells By NKG2D, A Receptor For Stress-Inducible MICA,” Science 285(5428):727-729; Jamieson, A. M. et al. (2002) “The Role Of The NKG2D Immunoreceptor In Immune Cell Activation And Natural Killing,” Immunity 17(1):19-29) as well as on all CD8.sup.+ T cells (Groh, V. et al. (2001) “Costimulation Of CD8αβ T Cells By NKG2D Via Engagement By MIC Induced On Virus-Infected Cells,” Nat. Immunol. 2(3):255-260; Jamieson, A. M. et al. (2002) “The Role Of The NKG2D Immunoreceptor In Immune Cell Activation And Natural Killing,” Immunity 17(1):19-29). Such binding ligands, and particularly those which are not expressed on normal cells, include the histocompatibility 60 (H60) molecule, the product of the retinoic acid early inducible gene-1 (RAE-1), and the murine UL16-binding protein like transcript 1 (MULTI) (Raulet D. H. (2003) “Roles Of The NKG2D Immunoreceptor And Its Ligands,” Nature Rev. Immunol. 3:781-790; Coudert, J. D. et al. (2005) “Altered NKG2D Function In NK Cells Induced By Chronic Exposure To Altered NKG2D Ligand-Expressing Tumor Cells,” Blood 106:1711-1717). Antibodies that specifically bind to the NKG2D Receptor include KYK-2.0 (Kwong, K Y et al. (2008) “Generation, Affinity Maturation, And Characterization Of A Human Anti Human NKG2D Monoclonal Antibody With Dual Antagonistic And Agonistic Activity,” J. Mol. Biol. 384:1143-1156; and PCT/US09/54911).

(310) The amino acid sequence of the VL Domain of anti-NKG2D antibody KYK-1.0 is (SEQ ID NO:134) (CDR residues are shown underlined):

(311) TABLE-US-00106 QPVLTQPSSV SVAPGETARI PCGGDDIETK SVHWYQQKPG QAPVLVIYDD DDRPSGIPER FFGSNSGNTA TLSISRVEAG DEADYYCQVW DDNNDEWVFG GGTQLTVL

(312) The amino acid sequence of the VH Domain of anti-NKG2D antibody KYK-1.0 is (SEQ ID NO:135) (CDR residues are shown underlined):

(313) TABLE-US-00107 EVQLVESGGG VVQPGGSLRL SCAASGFTFS SYGMHWVRQA PGKGLEWVAF IRYDGSNKYY ADSVKGRFTI SRDNSKNTKY LQMNSLRAED TAVYYCAKDR FGYYLDYWGQ GTLVTVSS

(314) The amino acid sequence of a VL Domain of anti-NKG2D antibody KYK-2.0 is (SEQ ID NO:136) (CDR residues are shown underlined):

(315) TABLE-US-00108 QSALTQPASV SGSPGQSITI SCSGSSSNIG NNAVNWYQQL PGKAPKLLIY YDDLLPSGVS DRFSGSKSGT SAFLAISGLQ SEDEADYYCA AWDDSLNGPV FGGGTKLTVL

(316) The amino acid sequence of a VH Domain of anti-NKG2D antibody KYK-2.0 is (SEQ ID NO:137) (CDR residues are shown underlined):

(317) TABLE-US-00109 QVQLVESGGG LVKPGGSLRL SCAASGFTFS SYGMHWVRQA PGKGLEWVAF IRYDGSNKYY ADSVKGRFTI SRDNSKNTLY LQMNSLRAED TAVYYCAKDR GLGDGTYFDY WGQGTTVTVS S

D. Preferred Trispecific Binding Molecules of the Present Invention

(318) 1. Preferred Fc Domains

(319) The CH2 and CH3 Domains of the two heavy chains interact to form the Fc Domain, which is a domain that is recognized by cellular Fc Receptors (FcγRs). As used herein, the term “Fc Domain” is used to define a C-terminal region of an IgG heavy chain. The amino acid sequence of the CH2-CH3 domain of an exemplary human IgG1 is (SEQ ID NO:1):

(320) TABLE-US-00110 |CH2.fwdarw. APELLGGPS VFLFPPKPKD TLMISRTPEV TCVVVDVSHE DPEVKFNWYV DGVEVHNAKT 231       240        250        260        270        280                                                    .fwdarw.CH2 | CH3.fwdarw. KPREEQYNST YRVVSVLTVL HQDWLNGKEY KCKVSNKALP APIEKTISKA K GQPREPQVY 290        300        310        320        330        340 TLPPSREEMT KNQVSLTCLV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLYSK 350        360        370        380        390        400                                      ←CH3| LTVDKSRWQQ GNVFSCSVMH EALHNHYTQK SLSLSPGK 410        420        430        440

(321) Throughout the present specification, the numbering of the residues in an IgG heavy chain is that of the EU index as in Kabat et al., Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, NH1, MD (1991), expressly incorporated herein by references. The “EU index as in Kabat” refers to the numbering of the human IgG1 EU antibody. Amino acids from the variable regions of the mature heavy and light chains of immunoglobulins are designated by the position of an amino acid in the chain. Kabat described numerous amino acid sequences for antibodies, identified an amino acid consensus sequence for each subgroup, and assigned a residue number to each amino acid. Kabat's numbering scheme is extendible to antibodies not included in his compendium by aligning the antibody in question with one of the consensus sequences in Kabat by reference to conserved amino acids. This method for assigning residue numbers has become standard in the field and readily identifies amino acids at equivalent positions in different antibodies, including chimeric or humanized variants. For example, an amino acid at position 50 of a human antibody light chain occupies the equivalent position to an amino acid at position 50 of a mouse antibody light chain.

(322) Although boundaries may vary slightly, the CH2 domain of a human IgG Fc Domain usually extends from amino acids 231 to amino acid 341 of a human IgG according to the numbering system of Kabat. The CH3 domain of a human IgG usually extends from amino acids 342 to 447 according to the numbering system of Kabat. The “hinge region” or “hinge domain” is generally defined as stretching from Glu216 to Pro230 of human IgG1.

(323) Polymorphisms have been observed at a number of different positions within antibody constant regions (e.g., Fc positions, including but not limited to positions 270, 272, 312, 315, 356, and 358 as numbered by the EU index as set forth in Kabat), and thus slight differences between the presented sequence and sequences in the prior art can exist. Polymorphic forms of human immunoglobulins have been well-characterized. At present, 18 Gm allotypes are known: G1m (1, 2, 3, 17) or G1m (a, x, f, z), G2m (23) or G2m (n), G3m (5, 6, 10, 11, 13, 14, 15, 16, 21, 24, 26, 27, 28) or G3m (b1, c3, b3, b0, b3, b4, s, t, g1, c5, u, v, g5) (Lefranc, et al., The human IgG subclasses: molecular analysis of structure, function and regulation. Pergamon, Oxford, pp. 43-78 (1990); Lefranc, G. et al., 1979, Hum. Genet.: 50, 199-211). It is specifically contemplated that the antibodies of the present invention may be incorporate any allotype, isoallotype, or haplotype of any immunoglobulin gene, and are not limited to the allotype, isoallotype or haplotype of the sequences provided herein.

(324) Activating and inhibitory signals are transduced through the Fc Receptors (FcγRs) following their ligation to an Fc Domain. These diametrically opposing functions result from structural differences among the different receptor isoforms. Two distinct domains within the cytoplasmic signaling domains of the receptor called immunoreceptor tyrosine-based activation motifs (ITAMs) or immunoreceptor tyrosine-based inhibitory motifs (ITIMS) account for the different responses. The recruitment of different cytoplasmic enzymes to these structures dictates the outcome of the FcγR-mediated cellular responses. ITAM-containing FcγR complexes include FcγRI, FcγRIIA, FcγRIIIA, whereas ITIM-containing complexes only include FcγRIIB. Human neutrophils express the FcγRIIA gene. FcγRIIA clustering via immune complexes or specific antibody cross-linking serves to aggregate ITAMs along with receptor-associated kinases which facilitate ITAM phosphorylation. ITAM phosphorylation serves as a docking site for Syk kinase, activation of which results in activation of downstream substrates (e.g., PI.sub.3K). Cellular activation leads to release of proinflammatory mediators. The FcγRIIB gene is expressed on B lymphocytes; its extracellular domain is 96% identical to FcγRIIA and binds IgG complexes in an indistinguishable manner. The presence of an ITIM in the cytoplasmic domain of FcγRIIB defines this inhibitory subclass of FcγR. Recently the molecular basis of this inhibition was established. When co-ligated along with an activating FcγR, the ITIM in FcγRIIB becomes phosphorylated and attracts the SH2 domain of the inositol polyphosphate 5′-phosphatase (SHIP), which hydrolyzes phosphoinositol messengers released as a consequence of ITAM-containing FcγR-mediated tyrosine kinase activation, consequently preventing the influx of intracellular Ca.sup.++. Thus cross-linking of FcγRIIB dampens the activating response to FcγR ligation and inhibits cellular responsiveness. B cell activation, B cell proliferation and antibody secretion is thus aborted.

(325) The Fc Domain of the binding molecules of the present invention may be either a complete Fc Domain (e.g., a complete IgG Fc Domain) or only a fragment of a complete Fc Domain. Although the Fc Domain of the bi-specific monovalent Fc diabodies of the present invention may possess the ability to bind to one or more Fc receptors (e.g., FcγR(s)), more preferably such Fc Domain will cause altered binding to FcγRIA (CD64), FcγRIIA (CD32A), FcγRIIB (CD32B), FcγRIIIA (CD16a) or FcγRIIIB (CD16b) (relative to the binding exhibited by a wild-type Fc Domain) or will substantially eliminate the ability of such Fc Domain to bind to inhibitory receptor(s). Thus, the Fc Domain of the Fc Domain-containing diabodies of the present invention may include some or all of the CH2 Domain and/or some or all of the CH3 Domain of a complete Fc Domain, or may comprise a variant CH2 and/or a variant CH3 sequence (that may include, for example, one or more insertions and/or one or more deletions with respect to the CH2 or CH3 domains of a complete Fc Domain). Such Fc Domains may comprise non-Fc polypeptide portions, or may comprise portions of non-naturally complete Fc Domains, or may comprise non-naturally occurring orientations of CH2 and/or CH3 domains (such as, for example, two CH2 domains or two CH3 Domains, or in the N-terminal to C-terminal direction, a CH3 Domain linked to a CH2 Domain, etc.).

(326) Fc Domain modifications identified as altering effector function are known in the art, including modifications that increase binding to activating receptors (e.g., FcγRIIA (CD16A) and reduce binding to inhibitory receptors (e.g., FcγRIIB (CD32B) (see, e.g., Stavenhagen, J. B. et al. (2007) “Fc Optimization Of Therapeutic Antibodies Enhances Their Ability To Kill Tumor Cells In Vitro And Controls Tumor Expansion In Vivo Via Low Affinity Activating Fcgamma Receptors,” Cancer Res. 57(18):8882-8890).

(327) In particular, it is preferred for the CH2-CH3 domains of the polypeptide chains of the Fc Domain-containing diabodies of the present invention to exhibit decreased (or substantially no) binding to FcγRIA (CD64), FcγRIIA (CD32A), FcγRIIB (CD32B), FcγRIIIA (CD16a) or FcγRIIIB (CD16b) (relative to the binding exhibited by the wild-type Fc Domain (SEQ ID NO:1). Fc variants and mutant forms capable of mediating such altered binding are described above. In a preferred embodiment the CH2-CH3 Domain of the first and/or third polypeptide chains of such diabodies include any 1, 2, 3, 4, 5, 6, or 7 of the substitutions: L234A, L235A, F243L, R292P, Y300L, V305I and P396L. Exemplary variants of human IgG1 Fc Domains with reduced binding to CD32B and/or increased binding to CD16A contain F243L, R292P, Y300L, V305I or P296L substitutions. These amino acid substitutions may be present in a human IgG1 Fc Domain in any combination. In one embodiment, the human IgG1 Fc Domain variant contains a F243L, R292P and Y300L substitution. In another embodiment, the human IgG1 Fc Domain variant contains a F243L, R292P, Y300L, V305I and P296L substitution. In one embodiment the CH2-CH3 Domain of the first and/or third polypeptide chains of such diabodies include any 1, 2, or 3, of the substitutions: L234A, L235A, N297G, N297Q. In another embodiment, the human IgG1 Fc Domain variant contains an N297Q substitution, L234A and L235A substitutions or a D265A substitution, as these mutations abolish FcR binding. Alternatively, a CH2-CH3 domain which inherently exhibits decreased (or substantially no) binding to FcγRIIIA (CD16a) and/or reduced effector function (relative to the binding exhibited by the wild-type IgG1 Fc Domain (SEQ ID NO:1)) is utilized. In a specific embodiment, the Fc Domain-containing diabodies of the present invention comprise an IgG2 Fc Domain or an IgG4 Fc Domain. Where an IgG4 Fc Domain in utilized the instant invention also encompasses the introduction of a stabilizing mutation such as S228P, as numbered by the EU index as set forth in Kabat (Lu et al., (2008) “The Effect Of A Point Mutation On The Stability Of Igg4 As Monitored By Analytical Ultracentrifugation,” J Pharmaceutical Sciences 97:960-969) to reduce the incidence of strand exchange. Other stabilizing mutations known in the art may be introduced into an IgG4 Fc Domain (Peters, P et al., (2012) “Engineering an Improved IgG4 Molecule with Reduced Disulfide Bond Heterogeneity and Increased Fab Domain Thermal Stability,” J. Biol. Chem., 287:24525-24533; PCT Patent Publication No: WO 2008/145142). Since the N297A, L234A, L235A and D265A substitutions abolish effector function, in circumstances in which effector function is desired, these substitutions would preferably not be employed.

(328) The CH2 and/or CH3 Domains of such polypeptide chains need not be identical in sequence, and advantageously are modified to foster complexing between the two polypeptide chains. For example, an amino acid substitution (preferably a substitution with an amino acid comprising a bulky side group forming a “knob”, e.g., tryptophan) can be introduced into the CH2 or CH3 Domain such that steric interference will prevent interaction with a similarly mutated domain and will obligate the mutated domain to pair with a domain into which a complementary, or accommodating mutation has been engineered, i.e., “the hole” (e.g., a substitution with glycine). Such sets of mutations can be engineered into any two of the polypeptides of the Tri-Specific Binding Molecule. Methods of protein engineering to favor heterodimerization over homodimerization are well-known in the art, in particular with respect to the engineering of immunoglobulin-like molecules, and are encompassed herein (see e.g., Ridgway et al. (1996) “‘Knobs-Into-Holes’ Engineering Of Antibody CH3 Domains For Heavy Chain Heterodimerization,” Protein Engr. 9:617-621, Atwell et al. (1997) “Stable Heterodimers From Remodeling The Domain Interface Of A Homodimer Using A Phage Display Library,” J. Mol. Biol. 270: 26-35, and Xie et al. (2005) “A New Format Of Bi-specific Antibody: Highly Efficient Heterodimerization, Expression And Tumor Cell Lysis,” J. Immunol. Methods 296:95-101; each of which is hereby incorporated herein by reference in its entirety). Preferably the “knob” is engineered into the CH2-CH3 Domains of the first polypeptide chain and the “hole” is engineered into the CH2-CH3 Domains of the other CH2-CH3-containing polypeptide chain. Thus, the “knob” will help in preventing the first polypeptide chain from homodimerizing via its CH2 and/or CH3 Domains. The CH2-CH3 “hole-bearing” polypeptide chain will heterodimerize with the CH2-CH3 “knob-bearing” polypeptide chain, and will also homodimerize with itself. A preferred knob is created by modifying a native IgG Fc Domain to contain the modification T366W. A preferred hole is created by modifying a native IgG Fc Domain to contain the modification T366S, L368A and Y407V. To aid in purifying the “hole-bearing” polypeptide chain homodimer from the final Tri-Specific Binding Molecule, the protein A binding site of the CH2 and CH3 Domains of the “hole-bearing” Fc Domain is preferably mutated by amino acid substitution at position 435 (H435R). Thus, the “hole-bearing” Fc Domain homodimer will not bind to protein A, whereas the desired Tri-Specific Binding Molecule will retain its ability to bind protein A via the protein A binding site on the first polypeptide chain.

(329) A preferred sequence for the CH2 and CH3 Domains of the first polypeptide chain of an Fc Domain-containing diabody of the present invention will have the “knob-bearing” sequence (SEQ ID NO:52):

(330) TABLE-US-00111 APEAAGGPSV FLFPPKPKDT LMISRTPEVT CVVVDVSHED PEVKFNWYVD GVEVHNAKTK PREEQYNSTY RVVSVLTVLH QDWLNGKEYK CKVSNKALPA PIEKTISKAK GQPREPQVYT LPPSREEMTK NQVSLWCLVK GFYPSDIAVE WESNGQPENN YKTTPPVLDS DGSFFLYSKL TVDKSRWQQG NVFSCSVMHE ALHNHYTQKS LSLSPGK

(331) A preferred sequence for the CH2 and CH3 Domains of the second polypeptide chain of an Fc Domain-containing diabody of the present invention having two polypeptide chains (or the third polypeptide chain of an Fc Domain-containing diabody having three polypeptide chains) will have the “hole-bearing” sequence (SEQ ID NO:53):

(332) TABLE-US-00112 APEAAGGPSV FLFPPKPKDT LMISRTPEVT CVVVDVSHED PEVKFNWYVD GVEVHNAKTK PREEQYNSTY RVVSVLTVLH QDWLNGKEYK CKVSNKALPA PIEKTISKAK GQPREPQVYT LPPSREEMTK NQVSLSCAVK GFYPSDIAVE WESNGQPENN YKTTPPVLDS DGSFFLVSKL TVDKSRWQQG NVFSCSVMHE ALHNRYTQKS LSLSPGK

(333) As will be noted, the CH2-CH3 Domains of SEQ ID NO:52 and SEQ ID NO:53 include a substitution at position 234 with alanine and 235 with alanine, and thus form an Fc Domain exhibit decreased (or substantially no) binding to FcγRIA (CD64), FcγRIIA (CD32A), FcγRIIB (CD32B), FcγRIIIA (CD16a) or FcγRIIIB (CD16b) (relative to the binding exhibited by the wild-type Fc Domain (SEQ ID NO:1).

(334) It is preferred that the first polypeptide chain will have a “knob-bearing” CH2-CH3 sequence, such as that of SEQ ID NO:52. However, as will be recognized, a “hole-bearing” CH2-CH3 Domain (e.g., SEQ ID NO:53) could be employed in the first polypeptide chain, in which case, a “knob-bearing” CH2-CH3 Domain (e.g., SEQ ID NO:52) would be employed in the second polypeptide chain of an Fc Domain-containing diabody of the present invention having two polypeptide chains (or the third polypeptide chain of an Fc Domain-containing diabody having three polypeptide chains).

(335) 2. Preferred First Polypeptide Chain

(336) A first polypeptide chain of a preferred binding molecule of the present invention will comprise a Variable Light Chain Domain capable of binding to Epitope I (VL.sub.I), a Variable Heavy Chain Domain capable of binding to Epitope II (VH.sub.II), a Heterodimer-Promoting Domain and a CH2-CH3 Domain.

(337) Since the Variable Light Chain and Variable Heavy Chain Domains of the first polypeptide are directed toward different epitopes, they cannot associate together to form a Binding Domain that is able to bind either Epitope I or Epitope II. The Variable Light Chain and Variable Heavy Chain Domains of the first polypeptide are spaced apart from one another by an intervening linker peptide that is sufficiently short as to substantially prevent the association of these Domains. An exemplary linker, termed “Linker 1,” has the sequence (SEQ ID NO:33): GGGSGGGG.

(338) The Variable Heavy Chain Domain of the first polypeptide and the Heterodimer-Promoting Domain of that polypeptide are preferably spaced apart from one another by an intervening linker peptide that contains 1, 2, 3 or more cysteine residues. A preferred cysteine-containing spacer peptide (“Linker 2”) has the sequence is SEQ ID NO:34: GGCGGG.

(339) Linkers that may be employed to link a CH2-CH3 Domain to a polypeptide chain of the molecules of the present invention include: ASTKG (SEQ ID NO:47), DKTHTCPPCP (SEQ ID NO:48), LEPKSS (SEQ ID NO:49), and APSSSPME (SEQ ID NO:50), APSSS (SEQ ID NO:152) and GGG or GCG. SEQ ID NO:49 may be used in lieu of GGG or GCG for ease of cloning. Additionally, SEQ ID NO:49 may be immediately followed by SEQ ID NO:47 to form an alternate linker (LEPKSSDKTHTCPPCP; SEQ ID NO:51).

(340) The Heterodimer-Promoting Domain of the first polypeptide and the Heterodimer-Promoting Domain of the second polypeptide are coordinately selected. The Domains differ from one another and are designed to associate with one another so as to promote the association of the first and second polypeptide chains. For example, one of the Heterodimer-Promoting Domains will be engineered to have a negative charge at pH 7, while the other of the two polypeptide chains will be engineered to have a positive charge at pH 7. The presence of such charged Domains promotes association between the first and second polypeptides, and thus fosters heterodimerization. It is immaterial which Heterodimer-Promoting Domains is provided to which chain, as long as the Domains employed on the first and second polypeptide chains differ so as to foster heterodimerization between such chains.

(341) The Heterodimer-Promoting Domains may be the IgG CL and CH1 domains or may be a peptide having the amino acid sequence GVEPKSC (SEQ ID NO:35) or VEPKSC (SEQ ID NO:36), derived from the hinge domain of a human IgG, and in lieu of the CL domain, one may employ the C-terminal 6 amino acids of the human kappa light chain, GFNRGEC (SEQ ID NO:37) or FNRGEC (SEQ ID NO:38).

(342) More preferably, however, the Heterodimer-Promoting Domains of such diabodies are formed from one, two, three or four tandemly repeated coil domains of opposing charge that comprise a sequence of at least six, at least seven or at least eight charged amino acid residues (Apostolovic, B. et al. (2008) “pH-Sensitivity of the E3/K3 Heterodimeric Coiled Coil,” Biomacromolecules 9:3173-3180; Arndt, K. M. et al. (2001) “Helix-stabilized Fv (hsFv) Antibody Fragments: Substituting the Constant Domains of a Fab Fragment for a Heterodimeric Coiled-coil Domain,” J. Molec. Biol. 312:221-228; Arndt, K. M. et al. (2002) “Comparison of In Vivo Selection and Rational Design of Heterodimeric Coiled Coils,” Structure 10:1235-1248; Boucher, C. et al. (2010) “Protein Detection By Western Blot Via Coiled-Coil Interactions,” Analytical Biochemistry 399:138-140; Cachia, P. J. et al. (2004) “Synthetic Peptide Vaccine Development: Measurement Of Polyclonal Antibody Affinity And Cross Reactivity Using A New Peptide Capture And Release System For Surface Plasmon Resonance Spectroscopy,” J. Mol. Recognit. 17:540-557; De Crescenzo, G. D. et al. (2003) “Real-Time Monitoring of the Interactions of Two-Stranded de novo Designed Coiled-Coils: Effect of Chain Length on the Kinetic and Thermodynamic Constants of Binding,” Biochemistry 42:1754-1763; Fernandez-Rodriquez, J. et al. (2012) “Induced Heterodimerization And Purification Of Two Target Proteins By A Synthetic Coiled-Coil Tag,” Protein Science 21:511-519; Ghosh, T. S. et al. (2009) “End-To-End And End-To-Middle Interhelical Interactions: New Classes Of Interacting Helix Pairs In Protein Structures,” Acta Crystallographica D65:1032-1041; Grigoryan, G. et al. (2008) “Structural Specificity In Coiled-Coil Interactions,” Curr. Opin. Struc. Biol. 18:477-483; Litowski, J. R. et al. (2002) “Designing Heterodimeric Two-Stranded α-Helical Coiled-Coils: The Effects Of Hydrophobicity And α-Helical Propensity On Protein Folding, Stability, And Specificity,” J. Biol. Chem. 277:37272-37279; Steinkruger, J. D. et al. (2012) “The d′-d-d′ Vertical Triad is Less Discriminating Than the a′-a-a′ Vertical Triad in the Antiparallel Coiled-coil Dimer Motif” J. Amer. Chem. Soc. 134(5):2626-2633; Straussman, R. et al. (2007) “Kinking the Coiled Coil Negatively Charged Residues at the Coiled-coil Interface,” J. Molec. Biol. 366:1232-1242; Tripet, B. et al. (2002) “Kinetic Analysis of the Interactions between Troponin C and the C-terminal Troponin I Regulatory Region and Validation of a New Peptide Delivery/Capture System used for Surface Plasmon Resonance,” J. Molec. Biol. 323:345-362; Woolfson, D. N. (2005) “The Design Of Coiled-Coil Structures And Assemblies,” Adv. Prot. Chem. 70:79-112; Zeng, Y. et al. (2008) “A Ligand-Pseudoreceptor System Based On de novo Designed Peptides For The Generation Of Adenoviral Vectors With Altered Tropism,” J. Gene Med. 10:355-367).

(343) Such repeated coil domains may be exact repeats or may have substitutions. For example, the Heterodimer-Promoting Domain of the first polypeptide chain may comprise a sequence of eight negatively charged amino acid residues and the Heterodimer-Promoting Domain of the second polypeptide chain may comprise a sequence of eight negatively charged amino acid residues. It is immaterial which coil is provided to the first or second polypeptide chains, provided that a coil of opposite charge is used for the other polypeptide chain. The positively charged amino acid may be lysine, arginine, histidine, etc. and/or the negatively charged amino acid may be glutamic acid, aspartic acid, etc. The positively charged amino acid is preferably lysine and/or the negatively charged amino acid is preferably glutamic acid. It is possible for only a single Heterodimer-Promoting Domain to be employed (since such domain will inhibit homodimerization and thereby promote heterodimerization), however, it is preferred for both the first and second polypeptide chains of the diabodies of the present invention to contain Heterodimer-Promoting Domains.

(344) In a preferred embodiment, one of the Heterodimer-Promoting Domains will comprise four tandem “E-coil” helical domains (SEQ ID NO:39: EVAALEK-EVAALEK-EVAALEK-EVAALEK), whose glutamate residues will form a negative charge at pH 7, while the other of the Heterodimer-Promoting Domains will comprise four tandem “K-coil” domains (SEQ ID NO:40: KVAALKE-KVAALKE-KVAALKE-KVAALKE), whose lysine residues will form a positive charge at pH 7. The presence of such charged domains promotes association between the first and second polypeptides, and thus fosters heterodimerization. Especially preferred is a Heterodimer-Promoting Domain in which one of the four tandem “E-coil” helical domains of SEQ ID NO:39 has been modified to contain a cysteine residue: EVAACEK-EVAALEK-EVAALEK-EVAALEK (SEQ ID NO:41). Likewise, especially preferred is a Heterodimer-Promoting Domain in which one of the four tandem “K-coil” helical domains of SEQ ID NO:40 has been modified to contain a cysteine residue: KVAACKE-KVAALKE-KVAALKE-KVAALKE (SEQ ID NO:42).

(345) As disclosed in WO 2012/018687, in order to improve the in vivo pharmacokinetic properties of diabodies, a diabody may be modified to contain a polypeptide portion of a serum-binding protein at one or more of the termini of the diabody. Most preferably, such polypeptide portion of a serum-binding protein will be installed at the C-terminus of the diabody. Albumin is the most abundant protein in plasma and has a half-life of 19 days in humans. Albumin possesses several small molecule binding sites that permit it to non-covalently bind to other proteins and thereby extend their serum half-lives. The Albumin-Binding Domain 3 (ABD3) of protein G of Streptococcus strain G148 consists of 46 amino acid residues forming a stable three-helix bundle and has broad albumin-binding specificity (Johansson, M. U. et al. (2002) “Structure, Specificity, And Mode Of Interaction For Bacterial Albumin-Binding Modules,” J. Biol. Chem. 277(10):8114-8120. Thus, a particularly preferred polypeptide portion of a serum-binding protein for improving the in vivo pharmacokinetic properties of a diabody is the Albumin-Binding Domain (ABD) from streptococcal protein G, and more preferably, the Albumin-Binding Domain 3 (ABD3) of protein G of Streptococcus strain G148 (SEQ ID NO:43): LAEAKVLANR ELDKYGVSDY YKNLIDNAKS AEGVKALIDE ILAALP.

(346) As disclosed in WO 2012/162068 (herein incorporated by reference), “deimmunized” variants of SEQ ID NO:43 have the ability to attenuate or eliminate MHC class II binding. Based on combinational mutation results, the following combinations of substitutions are considered to be preferred substitutions for forming such a deimmunized albumin-binding domain: 66S/70S+71A; 66S/70S+79A; 64A/65A/71A+66S; 64A/65A/71A+66D; 64A/65A/71A+66E; 64A/65A/79A+66S; 64A/65A/79A+66D; 64A/65A/79A+66E. Variant ABDs having the modifications L64A, I65A and D79A or the modifications N66S, T70S and D79A. Variant deimmunized ABD having the amino acid sequence:

(347) TABLE-US-00113 (SEQ ID NO: 44) LAEAKVLANR ELDKYGVSDY YKNA.sub.64A.sub.65NNAKT VEGVKALIA.sub.79E ILAALP,
or the amino acid sequence:

(348) TABLE-US-00114 (SEQ ID NO: 45) LAEAKVLANR ELDKYGVSDY YKNLIS.sub.66NAKS.sub.70 VEGVKALIA.sub.79E ILAALP,
are particularly preferred as such deimmunized Albumin-Binding Domains exhibit substantially wild-type binding while providing attenuated MHC class II binding. Thus, the first polypeptide chain of such a diabody having an Albumin-Binding Domain contains a third linker (Linker 3) preferably positioned C-terminally to the E-coil (or K-coil) Domain of such polypeptide chain so as to intervene between the E-coil (or K-coil) Domain and the Albumin-Binding Domain (which is preferably a deimmunized Albumin-Binding Domain). A preferred sequence for such Linker 3 is SEQ ID NO:46: GGGS.

(349) Thus, in sum, a preferred first polypeptide chain of a preferred Tri-Specific Binding Molecule of the present invention will comprise the Domains and linkers: (VL.sub.I Domain)-(Linker 1)-(VH.sub.II Domain)-(Linker 2)-(E-coil Heterodimer-Promoting Domain)-(Linker 3)-(Knob-Bearing CH2-CH3 Domain).

(350) 3. Alternative First Polypeptide Chain

(351) In one embodiment, the orientations of the above-described Domains will be in the N-terminal to C-terminal direction. The present invention, however, also contemplates a variation thereof, wherein the orientations of the Domains of the first polypeptide chain are: NH.sub.2-(Knob-Bearing CH3-CH2 Domain)-(VL.sub.I Domain)-(Linker 1)-(VH.sub.II Domain)-(Linker 2)-(E-coil Heterodimer-Promoting Domain). Preferably, a cysteine-containing peptide is present, N-terminal to such CH2-CH3 Domain. The sequence of an exemplary peptide is sequence (SEQ ID NO:48): DKTHTCPPCP. Preferably in this embodiment, the CH3 Domain is spaced apart from the VL.sub.I Domain by an intervening peptide linker (Linker 4), such as one having the amino acid sequence of (SEQ ID NO:152): APSSS, and more preferably, the amino acid sequence (SEQ ID NO:50): APSSSPME.

(352) 4. Preferred Second Polypeptide Chain

(353) A second polypeptide chain of such preferred Tri-Specific Binding Molecules will comprise, in the N-terminal to C-terminal direction, a Variable Light Chain Domain capable of binding to Epitope II (VL.sub.II), a Variable Heavy Chain Domain capable of binding to Epitope I (VH.sub.I), and a Heterodimer-Promoting Domain.

(354) Since the Variable Light Chain and Variable Heavy Chain Domains of the second polypeptide are directed toward different epitopes, they cannot associate together to form a Binding Domain that is able to bind either Epitope I or Epitope II. The Variable Light Chain and Variable Heavy Chain Domains of the second polypeptide are spaced apart from one another by an intervening linker peptide that is sufficiently short as to substantially prevent the association of these Domains. “Linker 1,” having the sequence (SEQ ID NO:33): GGGSGGGG is an exemplary linker for this purpose.

(355) As in the case of the first polypeptide chain, the Variable Heavy Chain Domain of the second polypeptide and the Heterodimer-Promoting Domain of that polypeptide are preferably spaced apart from one another by an intervening linker peptide that contains 1, 2, 3 or more cysteine residues. “Linker 2,” having the sequence (SEQ ID NO:34) GGCGGG is an exemplary linker for this purpose. Such cysteine residues can form disulfide bonds with cysteine residues in the cysteine-containing spacer peptide that separates the Variable Heavy Chain Domain of the first polypeptide and the Heterodimer-Promoting Domain of that polypeptide. Thus, the first and second polypeptides of the Binding Molecules of the present invention are covalently bonded to one another.

(356) As discussed above, the Heterodimer-Promoting Domain of the second polypeptide chain is selected so as coordinate with the Heterodimer-Promoting Domain of the first polypeptide chain. Thus, in a preferred embodiment, the Heterodimer-Promoting Domain of the first polypeptide chain is either a “K-coil” Domain (SEQ ID NO:40) or an “E-coil” Domain (SEQ ID NO:39). If the cysteine-containing E-coil (SEQ ID NO:41) is employed in the first polypeptide chain, then the cysteine-containing K-coil (SEQ ID NO:42) is preferably employed in the second polypeptide chain. Conversely, if the cysteine-containing K-coil (SEQ ID NO:42) is employed in the first polypeptide chain, then the cysteine-containing E-coil (SEQ ID NO:41) is preferably employed in the second polypeptide chain. Since the first polypeptide chain will preferably possess an “E-coil” Domain, the second polypeptide chain will preferably contain a “K-coil” Domain.

(357) As the first and second polypeptide chains are polypeptide chains of a diabody, they are able to associate together to form a Domain I Binding Domain (VL.sub.A/VH.sub.A) that recognizes and immunospecifically binds to Epitope I, and a Domain II Binding Domain (VL.sub.B/VH.sub.B) that recognizes and immunospecifically binds to Epitope II.

(358) Thus, in sum, a preferred second polypeptide chain of a preferred Binding Molecule of the present invention will comprise the Domains and linkers: (VL.sub.II Domain)-(Linker Domain)-(Linker 2)-(K-coil Heterodimer-Promoting Domain).

(359) 5. Preferred Third Polypeptide Chain

(360) A third polypeptide chain of a preferred Binding Molecule of the present invention is a polypeptide that comprises, in the N-terminal to C-terminal direction, a Binding Domain, an optional CH1-Hinge Domain, and a CH2-CH3 Domain. The Binding Domain of the third polypeptide chain of a preferred Binding Molecule of the present invention may be a Variable Heavy Chain Domain capable of binding to Epitope III (VH.sub.III), in which case, the fourth polypeptide chain of the preferred Binding Molecules of the present invention (discussed below) is a polypeptide that comprises a Variable Light Chain Domain capable of binding to Epitope III (VL.sub.III), such that the Binding Domain is capable of immunospecific binding to an antigen possessing Epitope III. Alternatively, the Binding Domain of the third polypeptide chain of the preferred Binding Molecules of the present invention may comprise an Effector Cell Receptor-Type Binding Domain, in which case, the fourth polypeptide chain of the preferred Binding Molecules of the present invention (discussed below) is a polypeptide that comprises a complementary Effector Cell Receptor-Type Binding Domain, such that the interaction of two polypeptide chains forms a Binding Domain that is capable of physiospecific binding to molecule present on the surface of the effector cell. The third polypeptide chain may be isolated from naturally occurring antibodies. Alternatively, it may be constructed recombinantly. An exemplary CH1 Domain is a human IgG1 CH1 Domain having the amino acid sequence (SEQ ID NO:207):

(361) TABLE-US-00115 ASTKGPSVFP LAPSSKSTSG GTAALGCLVK DYFPEPVTVS WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT YICNVNHKPS NTKVDKKV

(362) A variant of the human IgG1 CH1 Domain of SEQ ID NO:207 is (SEQ ID NO:208):

(363) TABLE-US-00116 ASTKGPSVFP LAPSSKSTSG GTAALGCLVK DYFPEPVTVS WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT YICNVNHKPS NTKVDKRV

(364) An exemplary Hinge Domain is a human IgG1 Hinge Domain having the amino acid sequence (SEQ ID NO:209): EPKSCDKTHTCPPCP. As will be recognized, the exemplary Hinge Domain comprises multiple cysteine residues (Elkabetz et al. (2005) “Cysteines In CH1 Underlie Retention Of Unassembled Ig Heavy Chains,” J. Biol. Chem. 280:14402-14412) that may participate in interchain covalent bonding.

(365) Although a wild-type CH2-CH3 Domain may be employed, it is preferred, as described above, to employ a modified CH2-CH3 Domain that promotes heterodimerization with the CH2-CH3 Domain of the first polypeptide chain.

(366) Preferably, therefore the CH2-CH3 Domain of the third polypeptide chain will be a “hole-bearing” CH2-CH3 Domain whose amino acid sequence is complementary to the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52) employed in the first polypeptide. As discussed above, the “hole-bearing” CH2-CH3 domain preferably should comprise a substitution at position 435 (H435R) to remove the Protein A binding site. An exemplary “hole-bearing” CH2-CH3 Domain with the H435R substitution for the third polypeptide is SEQ ID NO:53.

(367) As will be recognized, a “knob-bearing” CH2-CH3 Domain (e.g., SEQ ID NO:52) could be employed in the third polypeptide chain, in which case, a “hole-bearing”CH2-CH3 Domain (e.g., SEQ ID NO:53) would be employed in the first polypeptide chain.

(368) In the embodiment in which the third (and fourth) polypeptide chains of the preferred Tri-Specific Binding Molecules of the present invention each comprise a polypeptide chain of an Effector Cell Receptor-Type Binding Domain, methods for producing such Effector Cell Receptor-Type Binding Domains are well-known (e.g., US2012/0294874A1).

(369) Thus, in sum, a third polypeptide chain of the preferred Binding Molecules of the present invention will comprise the Domains and linkers: (VH.sub.III Domain)-(Optional CH1 Domain)-(Optional Hinge Domain)-(“Hole-Bearing” CH2-CH3 Domain), or (T Cell Receptor-Type Binding Domain; first or second polypeptide thereof)-(Optional CH1 Domain)-(Optional Hinge Domain)-(“Hole-Bearing” CH2-CH3 Domain).

(370) 6. Preferred Fourth Polypeptide Chain

(371) A fourth polypeptide chain of the preferred Tri-Specific Binding Molecules of the present invention is either a polypeptide of an Effector Cell Receptor-Type Binding Domain (wherein the third and fourth polypeptides form a ligand for a receptor found on the surface of an effector cell, or more preferably, a light chain of the above-indicated antibody that immunospecifically binds to Epitope III or which are complementary to the binding domain of the third polypeptide chain.

(372) Thus, wherein the third and fourth polypeptides form a Fab-Type Binding Domain such fourth polypeptide chain comprises, in the N-terminal to C-terminal direction, a Variable Light Chain Domain capable of binding to Epitope III (VL.sub.III), and a Domain for promoting covalent bonding to the third polypeptide chain or a Binding Domain and such Domain for promoting covalent bonding to the third polypeptide chain. Such Domain may be a CL Domain, or a cysteine-containing portion thereof, such as (SEQ ID NO:38) FNRGEC or a linker such as Linker 2 (having the sequence (SEQ ID NO:34) GGCGGG. An exemplary a cysteine-containing peptide that forms disulfide bonds with such Linker 2 comprises the amino acid sequence VEPKSC (SEQ ID NO:36) or a Hinge Domain.

(373) The fourth polypeptide chain may be isolated from naturally occurring antibodies. Alternatively, it may be constructed recombinantly. A preferred CL Domain is a human IgG1 CL Kappa Domain having the amino acid sequence (SEQ ID NO:210):

(374) TABLE-US-00117 RTVAAPSVFI FPPSDEQLKS GTASVVCLLN NFYPREAKVQ WKVDNALQSG NSQESVTEQD SKDSTYSLSS TLTLSKADYE KHKVYACEVT HQGLSSPVTK SFNRGEC

(375) Alternatively, an exemplary CL Domain is a human IgG1 CL Lambda2 Domain having the amino acid sequence (SEQ ID NO:211):

(376) TABLE-US-00118 QPKAAPSVTL FPPSSEELQA NKATLVCLIS DFYPGAVTVA WKADSSPVKA GVETTPSKQS NNKYAASSYL SLTPEQWKSH RSYSCQVTHE GSTVEKTVAP TECS

(377) As will be noticed, the CL Domain, or other Cysteine-Containing Domain, of the fourth polypeptide chain comprises cysteine residues. Such cysteine residues are able to covalently bond to cysteine residues of the CH1 Domain of the third polypeptide chain to thereby covalently complex the third and fourth polypeptide chains of the binding molecules of the present invention to one another. Thus the third and fourth polypeptide chains are covalently bonded to one another.

(378) Additionally, cysteine residues of the CH2-CH3 Domain of the first polypeptide chain can form disulfide bonds with cysteine residues of the CH2-CH3 Domain of the third polypeptide chain. Thus the first and third polypeptide chains are covalently bonded to one another.

E. Variant Fc Domains

(379) In traditional immune function, the interaction of antibody-antigen complexes with cells of the immune system results in a wide array of responses, ranging from effector functions such as antibody-dependent cytotoxicity, mast cell degranulation, and phagocytosis to immunomodulatory signals such as regulating lymphocyte proliferation and antibody secretion. All of these interactions are initiated through the binding of the Fc Domain of antibodies or immune complexes to specialized cell surface receptors on hematopoietic cells. The diversity of cellular responses triggered by antibodies and immune complexes results from the structural heterogeneity of the three Fc receptors: FcγRI (CD64), FcγRII (CD32), and FcγRIII (CD16). FcγRI (CD64), FcγRIIA (CD32A) and FcγRIII (CD16) are activating (i.e., immune system enhancing) receptors; FcγRIIB (CD32B) is an inhibiting (i.e., immune system dampening) receptor. The amino acid sequence of an exemplary IgG1 Fc Domain (SEQ ID NO:1) is presented above.

(380) Modification of the Fc Domain normally leads to an altered phenotype, for example altered serum half-life, altered stability, altered susceptibility to cellular enzymes or altered effector function. It may be desirable to modify the antibody of the invention with respect to effector function, so as to enhance the effectiveness of the antibody in treating cancer, for example. Reduction or elimination of effector function is desirable in certain cases, for example in the case of antibodies whose mechanism of action involves blocking or antagonism, but not killing of the cells bearing a target antigen. Increased effector function is generally desirable when directed to undesirable cells, such as tumor and foreign cells, where the FcγRs are expressed at low levels, for example, tumor-specific B cells with low levels of FcγRIIB (e.g., non-Hodgkins lymphoma, CLL, and Burkitt's lymphoma). In said embodiments, molecules of the invention with conferred or altered effector function activity are useful for the treatment and/or prevention of a disease, disorder or infection where an enhanced efficacy of effector function activity is desired.

(381) In certain embodiments, the Tri-Specific Binding Molecules of the present invention comprise an Fc Domain that possesses one or more modifications (e.g., substitutions, deletions, or insertions) to the sequence of amino acids of a wild-type Fc Domain (SEQ ID NO:1), which reduce the affinity and avidity of the Fc Domain and, thus, the molecule of the invention, for one or more FcγR receptors. In other embodiments, the molecules of the invention comprise an Fc Domain that possesses one or more modifications to the amino acids of the wild-type Fc Domain, which increase the affinity and avidity of the Fc Domain and, thus, the molecule of the invention, for one or more FcγR receptors. In other embodiments, the molecules comprise a variant Fc Domain wherein said variant confers or mediates increased ADCC activity and/or an increased binding to FcγRIIA, relative to a molecule comprising no Fc Domain or comprising a wild-type Fc Domain. In alternate embodiments, the molecules comprise a variant Fc Domain wherein said variant confers or mediates decreased ADCC activity (or other effector function) and/or an increased binding to FcγRIIB, relative to a molecule comprising no Fc Domain or comprising a wild-type Fc Domain. In some embodiments, the invention encompasses Tri-Specific Binding Molecules comprising a variant Fc Domain, which variant Fc Domain does not show a detectable binding to any FcγR, relative to a comparable molecule comprising the wild-type Fc Domain. In other embodiments, the invention encompasses Tri-Specific Binding Molecules comprising a variant Fc Domain, which variant Fc Domain only binds a single FcγR, preferably one of FcγRIIA, FcγRIIB, or FcγRIIIA. Any such increased affinity and/or avidity is preferably assessed by measuring in vitro the extent of detectable binding to the FcγR or FcγR-related activity in cells that express low levels of the FcγR when binding activity of the parent molecule (without the modified Fc Domain) cannot be detected in the cells, or in cells which express non-FcγR receptor target antigens at a density of 30,000 to 20,000 molecules/cell, at a density of 20,000 to 10,000 molecules/cell, at a density of 10,000 to 5,000 molecules/cell, at a density of 5,000 to 1,000 molecules/cell, at a density of 1,000 to 200 molecules/cell or at a density of 200 molecules/cell or less (but at least 10, 50, 100 or 150 molecules/cell).

(382) The Tri-Specific Binding Molecules of the present invention may comprise altered affinities for an activating and/or inhibitory Fcγ receptor. In one embodiment, the Tri-Specific Binding Molecule comprises a variant Fc Domain that has increased affinity for FcγRIIB and decreased affinity for FcγRIIIA and/or FcγRIIA, relative to a comparable molecule with a wild-type Fc Domain. In another embodiment, the Tri-Specific Binding Molecule of the present invention comprise a variant Fc Domain, which has decreased affinity for FcγRIIB and increased affinity for FcγRIIIA and/or FcγRIIA, relative to a comparable molecule with a wild-type Fc Domain. In yet another embodiment, the Tri-Specific Binding Molecules of the present invention comprise a variant Fc Domain that has decreased affinity for FcγRIIB and decreased affinity for FcγRIIIA and/or FcγRIIA, relative to a comparable molecule with a wild-type Fc Domain. In still another embodiment, the Tri-Specific Binding Molecules of the present invention comprise a variant Fc Domain, which has unchanged affinity for FcγRIIB and decreased (or increased) affinity for FcγRIIIA and/or FcγRIIA, relative to a comparable molecule with a wild-type Fc Domain.

(383) In certain embodiments, the Tri-Specific Binding Molecules of the present invention comprise a variant Fc Domain having an altered affinity for FcγRIIIA and/or FcγRIIA such that the immunoglobulin has an enhanced effector function, e.g., antibody-dependent cell-mediated cytotoxicity. Non-limiting examples of effector cell functions include antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent phagocytosis, phagocytosis, opsonization, opsonophagocytosis, cell binding, rosetting, C1q binding, and complement dependent cell-mediated cytotoxicity.

(384) In a preferred embodiment, the alteration in affinity or effector function is at least 2-fold, preferably at least 4-fold, at least 5-fold, at least 6-fold, at least 7-fold, at least 8-fold, at least 9-fold, at least 10-fold, at least 50-fold, or at least 100-fold, relative to a comparable molecule comprising a wild-type Fc Domain. In other embodiments of the invention, the variant Fc Domain immunospecifically binds one or more FcRs with at least 65%, preferably at least 70%, 75%, 80%, 85%, 90%, 95%, 100%, 125%, 150%, 175%, 200%, 225%, or 250% greater affinity relative to a molecule comprising a wild-type Fc Domain. Such measurements can be in vivo or in vitro assays, and in a preferred embodiment are in vitro assays such as ELISA or surface plasmon resonance assays.

(385) In different embodiments, the Tri-Specific Binding Molecules of the present invention comprise a variant Fc Domain wherein said variant agonizes at least one activity of an FcγR receptor, or antagonizes at least one activity of an FcγR receptor. In a preferred embodiment, the molecules comprise a variant that antagonizes one or more activities of FcγRIIB, for example, B cell receptor-mediated signaling, activation of B cells, B cell proliferation, antibody production, intracellular calcium influx of B cells, cell cycle progression, FcγRIIB-mediated inhibition of FcεRI signaling, phosphorylation of FcγRIIB, SHIP recruitment, SHIP phosphorylation and association with Shc, or activity of one or more downstream molecules (e.g., MAP kinase, JNK, p38, or Akt) in the FcγRIIB signal transduction pathway. In another embodiment, the Tri-Specific Binding Molecules of the present invention comprise a variant that agonizes one or more activities of FcεRI, for example, mast cell activation, calcium mobilization, degranulation, cytokine production, or serotonin release.

(386) In certain embodiments, the molecules comprise an Fc Domain comprising regions from two or more IgG isotypes (e.g., IgG1, IgG2, IgG3 and IgG4). The various IgG isotypes exhibit differing physical and functional properties including serum half-life, complement fixation, FcγR binding affinities and effector function activities (e.g., ADCC, CDC, etc.) due to differences in the amino acid sequences of their hinge and/or Fc Domains, for example as described in Flesch and Neppert (1999) J. Clin. Lab. Anal. 14:141-156; Chappel et al. (1993) J. Biol. Chem. 33:25124-25131; Chappel et al. (1991) Proc. Natl. Acad. Sci. (U.S.A.) 88:9036-9040; or Brüggemann et al. (1987) J. Exp. Med 166:1351-1361. This type of variant Fc Domain may be used alone, or in combination with an amino acid modification, to affect Fc-mediated effector function and/or binding activity. In combination, the amino acid modification and IgG hinge/Fc Domain may display similar functionality (e.g., increased affinity for FcγRIIA) and may act additively or, more preferably, synergistically to modify the effector functionality in the molecule of the invention, relative to a molecule of the invention comprising a wild-type Fc Domain. In other embodiments, the amino acid modification and IgG Fc Domain may display opposite functionality (e.g., increased and decreased affinity for FcγRIIA, respectively) and may act to selectively temper or reduce a specific functionality in the molecule of the invention, relative to a molecule of the invention not comprising an Fc Domain or comprising a wild-type Fc Domain of the same isotype.

(387) In a preferred specific embodiment, the Tri-Specific Binding Molecules of the present invention comprise a variant Fc Domain, wherein said variant Fc Domain comprises at least one amino acid modification relative to a wild-type Fc Domain, such that said molecule has an altered affinity for an FcR, provided that said variant Fc Domain does not have a substitution at positions that make a direct contact with FcγR based on crystallographic and structural analysis of Fc-FcR interactions such as those disclosed by Sondermann et al. (2000) Nature 406:267-73. Examples of positions within the Fc Domain that make a direct contact with FcγR are amino acid residues 234-239 (hinge region), amino acid residues 265-269 (B/C loop), amino acid residues 297-299 (C′/E loop), and amino acid residues 327-332 (F/G loop). In some embodiments, the molecules of the invention comprise variant Fc Domains comprise modification of at least one residue that does not make a direct contact with an FcγR based on structural and crystallographic analysis, e.g., is not within the Fc-FcγR binding site.

(388) Variant Fc Domains are well-known in the art, and any known Fc variant may be used in the present invention to confer or modify the effector function exhibited by a molecule of the invention comprising an Fc Domain (or portion thereof) as functionally assayed, e.g., in an NK dependent or macrophage dependent assay. For example, Fc Domain variants identified as altering effector function are disclosed in the Antibody Engineering Technology Art, and any suitable variant disclosed therein may be used in the present molecules.

(389) In certain embodiments, the Tri-Specific Binding Molecules of the present invention comprise a variant Fc Domain, having one or more amino acid modifications in one or more sites, which modification(s) alter (relative to a wild-type Fc Domain) the Ratio of Affinities of the variant Fc Domain to an activating FcγR (such as FcγRIIA or FcγRIIIA) relative to an inhibiting FcγR (such as FcγRIIB):

(390) $\mathrm{Ratio}\mathrm{of}\mathrm{Affinities}=\frac{\mathrm{Wild}\text{-}\mathrm{Type}\mathrm{to}\mathrm{Variant}\mathrm{Change}\mathrm{in}\mathrm{Affinity}\mathrm{to}\mathrm{Fc}\gamma R_{\mathrm{Activating}}}{\mathrm{Wild}\text{-}\mathrm{Type}\mathrm{to}\mathrm{Variant}\mathrm{Change}\mathrm{in}\mathrm{Affinity}\mathrm{to}\mathrm{Fc}\gamma R_{\mathrm{Inhibiting}}}$

(391) Particularly preferred are Tri-Specific Binding Molecules of the present invention that possess a variant Fc Domain (relative to the wild-type Fc Domain) in which the Fc variant has a Ratio of Affinities greater than 1. Such molecules have particular use in providing a therapeutic or prophylactic treatment of a disease, disorder, or infection, or the amelioration of a symptom thereof, where an enhanced efficacy of effector cell function (e.g., ADCC) mediated by FcγR is desired, e.g., cancer or infectious disease. In contrast, an Fc variant having a Ratio of Affinities less than 1 mediates decreased efficacy of effector cell function. Table 1 lists exemplary single, double, triple, quadruple and quintuple mutations by whether their Ratio of Affinities is greater than or less than 1.

(392) TABLE-US-00119 TABLE 1 Exemplary Single and Multiple Mutations Listed by Ratio of Affinities Single Double Triple Quadruple Quintuple Ratio of Affinities > 1 F243L F243L & F243L, P247L & L234F, F243L, L235V, F243L, D270E R292P N421K R292P & Y300L R292P, Y300L R292G F243L & F243L, R292P & L2351, F243L, & P396L R292P Y300L Y300L R292P & Y300L L235P, F243L, F243L & F243L, R292P & L235Q, F243L, R292P, Y300L P396L V305I R292P & Y300L & P396L D270E & F243L, R292P & F243L, P247L, F243L, R292P, P396L P396L D270E & N421K V3051, Y300L R292P & F243L, Y300L & F243L, R255L, & P396L Y300L P396L D270E & P396L R292P & P247L, D270E & F243L, D270E, V3051 N421K G316D & R416G R292P & R255L, D270E & F243L, D270E, P396L P396L K392T & P396L Y300L & D270E, G316D & F243L, D270E, P396L R416G P396L & Q419H P396L & D270E, K392T & F243L, R292P, Q419H P396L Y300L, & P396L D270E, P396L & F243L, R292P, Q419H V3051 & P396L V284M, R292L & P247L, D270E, K370N Y300L & N421K R292P, Y300L & R255L, D270E, P396L R292G & P396L R255L, D270E, Y300L & P396L D270E, G316D, P396L & R416G Ratio of Affinities < 1 Y300L F243L & F243L, R292P P396L P396L & V305I P247L & N421K R255L & P396L R292P & V305I K392T & P396L Ratio of Affinities > 1 P396L & Q419H

(393) In a specific embodiment, in variant Fc Domains, any amino acid modifications (e.g., substitutions) at any of positions 235, 240, 241, 243, 244, 247, 262, 263, 269, 298, 328, or 330 and preferably one or more of the following residues: A240, 1240, L241, L243, H244, N298, 1328 or V330. In a different specific embodiment, in variant Fc Domains, any amino acid modifications (e.g., substitutions) at any of positions 268, 269, 270, 272, 276, 278, 283, 285, 286, 289, 292, 293, 301, 303, 305, 307, 309, 331, 333, 334, 335, 337, 338, 340, 360, 373, 376, 416, 419, 430, 434, 435, 437, 438 or 439 and preferably one or more of the following residues: H280, Q280, Y280, G290, S290, T290, Y290, N294, K295, P296, D298, N298, P298, V298, 1300 or L300.

(394) In a preferred embodiment, in variant Fc Domains that bind an FcγR with an altered affinity, any amino acid modifications (e.g., substitutions) at any of positions 255, 256, 258, 267, 268, 269, 270, 272, 276, 278, 280, 283, 285, 286, 289, 290, 292, 293, 294, 295, 296, 298, 300, 301, 303, 305, 307, 309, 312, 320, 322, 326, 329, 330, 332, 331, 333, 334, 335, 337, 338, 339, 340, 359, 360, 373, 376, 416, 419, 430, 434, 435, 437, 438 or 439. Preferably, the variant Fc Domain has any of the following residues: A256, N268, Q272, D286, Q286, S286, A290, S290, A298, M301, A312, E320, M320, Q320, R320, E322, A326, D326, E326, N326, S326, K330, T339, A333, A334, E334, H334, L334, M334, Q334, V334, K335, Q335, A359, A360 or A430.

(395) In a different embodiment, in variant Fc Domains that bind an FcγR (via its Fc Domain) with a reduced affinity, any amino acid modifications (e.g., substitutions) at any of positions 252, 254, 265, 268, 269, 270, 278, 289, 292, 293, 294, 295, 296, 298, 300, 301, 303, 322, 324, 327, 329, 333, 335, 338, 340, 373, 376, 382, 388, 389, 414, 416, 419, 434, 435, 437, 438 or 439.

(396) In a different embodiment, in variant Fc Domains that bind an FcγR (via its Fc Domain) with an enhanced affinity, any amino acid modifications (e.g., substitutions) at any of positions 280, 283, 285, 286, 290, 294, 295, 298, 300, 301, 305, 307, 309, 312, 315, 331, 333, 334, 337, 340, 360, 378, 398 or 430. In a different embodiment, in variant Fc Domains that binds FcγRIIA with an enhanced affinity, any of the following residues: A255, A256, A258, A267, A268, N268, A272, Q272, A276, A280, A283, A285, A286, D286, Q286, S286, A290, S290, M301, E320, M320, Q320, R320, E322, A326, D326, E326, S326, K330, A331, Q335, A337 or A430.

(397) Preferred variants include one or more modifications at any of positions: 228, 230, 231, 232, 233, 234, 235, 239, 240, 241, 243, 244, 245, 247, 262, 263, 264, 265, 266, 271, 273, 275, 281, 284, 291, 296, 297, 298, 299, 302, 304, 305, 313, 323, 325, 326, 328, 330 or 332.

(398) Particularly preferred variants include one or more modifications selected from groups A-AI:

(399) TABLE-US-00120 A 228E, 228K, 228Y or 228G; B 230A, 230E, 230Y or 230G; C 231E, 231K, 231Y, 231P or 231G; D 232E, 232K, 232Y, 232G; E 233D; F 234I or 234F; G 235D, 235Q, 235P, 235I or 235V; H 239D, 239E, 239N or 239Q; I 240A, 240I, 240M or 240T; J 243R, 243, 243Y, 243L, 243Q, 243W, 243H or 243I; K 244H; L 245A; M 247G, 247V or 247L; N 262A, 262E, 262I, 262T, 262E or 262F; O 263A, 263I, 263M or 263T; P 264F, 264E, 264R, 264I, 264A, 264T or 264W; Q 265F, 265Y, 265H, 265I, 265L, 265T, 265V, 265N or 265Q; R 266A, 266I, 266M or 266T; S 271D, 271E, 271N, 271Q, 271K, 271R, 271S, 271T, 271H, 271A, 271V, 271L, 271I, 271F, 271M, 271Y, 271W or 271G; T 273I; U 275L or 275W; V 281D, 281K, 281Y or 281P; W 284E, 284N, 284T, 284L, 284Y or284M; X 291D, 291E, 291Q, 291T, 291H, 291I or 291G; Y 299A, 299D, 299E, 299F, 299G, 299H, 299I, 299K, 299L, 299M, 299N, 299P, 299Q, 299R, 299S, 299V, 299W or 299Y; Z 302I; AA 304D, 304N, 304T, 304H or 304L AB 305I; AC 313F; AD 323I; AE 325A, 325D, 325E, 325G, 325H, 325I, 325L, 325K, 325R, 325S, 325F, 325M, 325T, 325V, 325Y, 325W or 325P; AF 328D, 328Q, 328K, 328R, 328S, 328T, 328V, 328I, 328Y, 328W, 328P, 328G, 328A, 328E, 328F, 328H, 328M or 328N; AG 330L, 330Y, 330I or 330V; AH 332A, 332D, 332E, 332H, 332N, 332Q, 332T, 332K, 332R, 332S, 332V, 332L, 332F, 332M, 332W, 332P, 332G or 332Y; and AI 336E, 336K or 336Y

(400) Still more particularly preferred variants include one or more modifications selected from Groups 1-105:

(401) TABLE-US-00121 Group Variant Group Variant 1 A330L/I332E 54 S239D/D265L/N297D/ I332E 2 D265F/N297E/I332E 55 S239D/D265T/N297D/ I332E 3 D265Y/N297D/I332E 56 S239D/D265V/N297D/ I332E 4 D265Y/N297D/T299L/I332E 57 S239D/D265Y/N297D/ I332E 5 F241E/F243Q/V262T/V264F 58 S239D/I332D 6 F241E/F243Q/V262T/V264E/ 59 S239D/I332E I332E 7 F241E/F243R/V262E/V264R 60 S239D/I332E/A330I 8 F241E/F243R/V262E/V264R/ 61 S239D/I332N I332E 9 F241E/F243Y/V262T/V264R 62 S239D/I332Q 10 F241E/F243Y/V262T/V264R/ 63 S239D/N297D/I332E I332E 11 F241L/F243L/V262I/V264I 64 S239D/N297D/I332E/ A330Y 12 F241L/V262I 65 S239D/N297D/I332E/ A330Y/F241S/F243H/ V262T/V264T 13 F241R/F243Q/V262T/V264R 66 S239D/N297D/I332E/ K326E 14 F241R/F243Q/V262T/V264R/ 67 S239D/N297D/I332E/ I332E L235D 15 F241W/F243W/V262A/V264A 68 S239D/S298A/I332E 16 F241Y/F243Y/V262T/V264T 69 S239D/V264I/A330L/ I332E 17 F241Y/F243Y/V262T/V264T/ 70 S239D/V264I/I332E N297D/I332E 18 F243L/V262I/V264W 71 S239D/V264I/S298A/ I332E 19 P243L/V264I 72 S239E/D265N 20 L328D/I332E 73 S239E/D265Q 21 L328E/I332E 74 S239E/I332D 22 L328H/I332E 75 S239E/I332E 23 L328I/I332E 76 S239E/I332N 24 L328M/I332E 77 S239E/I332Q 25 L328N/I332E 78 S239E/N297D/I332E 26 L328Q/I332E 79 S239E/V264I/A330Y/ I332E 27 L328T/I332E 80 S239E/V264I/I332E 28 L328V/I332E 81 S239E/V264I/S298A/ A330Y/I332E 29 N297D/A330Y/I332E 82 S239N/A330L/I332E 30 N297D/I332E 83 S239N/A330Y/I332E 31 N297D/I332E/S239D/A330L 84 S239N/I332D 32 N297D/S298A/A330Y/I332E 85 S239N/I332E 33 N297D/T299L/I332E 86 S239N/I332N 34 N297D/T299F/I332E/N297D/ 87 S239N/I332Q T299H/I332E 35 N297D/T299I/I332E 88 S239N1S298A/I332E 36 N297D/T299L/I332E 89 S239Q/I332D 37 N297D/T299V/I332E 90 S239Q/I332E 38 N297E/I332E 91 S239Q/I332N 39 N297S/I332E 92 S239Q/I332Q 40 P230A/E233D/I332E 93 S239Q/V264I/I332E 41 P244H/P245A/P247V 94 S298A/I332E 42 S239D/A330L/I332E 95 V264E/N297D/I332E 43 S239D/A330Y/I332E 96 V264I/A330L/I332E 44 S239D/A330Y/I332E/K326E 97 V264I/A330Y/I332E 45 S239D/A330Y/I332E/K326T 98 V264I/I332E 46 S239D/A330Y/I332E/L234I 99 V264I/S298A/I332E 47 S239D/A330Y/I332E/L235D 100 Y296D/N297D/I332E 48 S239D/A330Y/I332E/V240I 101 Y296E/N297D/I332E 49 S239D/A330Y/I332E/V264T 102 Y296H/N297D/I332E 50 S239D/A330Y/I332E/V266I 103 Y296N/N297D/I332E 51 S239D/D265F/N297D/I332E 104 Y296Q/N297I/I332E 52 S239D/D265H/N297D/I332E 105 Y296T/N297D/I332E. 53 S239D/D265I/N297D/I332E

(402) In one embodiment, a multivalent DR5 binding molecule of the invention will comprise a variant Fc Domain having at least one modification in the Fc Domain. In certain embodiments, the variant Fc Domain comprises at least one substitution selected from the group consisting of L235V, F243L, R292P, Y300L, V305I, and P396L, wherein said numbering is that of the EU index as in Kabat.

(403) In a specific embodiment, the variant Fc Domain comprises: (A) at least one substitution selected from the group consisting of F243L, R292P, Y300L, V305I, and P396L; (B) at least two substitutions selected from the group consisting of: (1) F243L and P396L; (2) F243L and R292P; and (3) R292P and V305I; (C) at least three substitutions selected from the group consisting of: (1) F243L, R292P and Y300L; (2) F243L, R292P and V305I; (3) F243L, R292P and P396L; and (4) R292P, V305I and P396L; (D) at least four substitutions selected from the group consisting of: (1) F243L, R292P, Y300L and P396L; and (2) F243L, R292P, V305I and P396L; or (E) at least the five substitutions selected from the group consisting of: (1) F243L, R292P, Y300L, V305I and P396L; and (2) L235V, F243L, R292P, Y300L and P396L.

(404) In another specific embodiment, the variant Fc Domain comprises substitutions of: (A) F243L, R292P, and Y300L; (B) L235V, F243L, R292P, Y300L, and P396L; or (C) F243L, R292P, Y300L, V305I, and P396L.

(405) In other embodiments, the invention encompasses the use of any Fc variant known in the art, such as those disclosed in Jefferis, B. J. et al. (2002) “Interaction Sites On Human IgG-Fc For FcgammaR: Current Models,” Immunol. Lett. 82:57-65; Presta, L. G. et al. (2002) “Engineering Therapeutic Antibodies For Improved Function,” Biochem. Soc. Trans. 30:487-90; Idusogie, E. E. et al. (2001) “Engineered Antibodies With Increased Activity To Recruit Complement,” J. Immunol. 166:2571-75; Shields, R. L. et al. (2001) “High Resolution Mapping Of The Binding Site On Human IgG1 For Fc Gamma RI, Fc Gamma RH, Fc Gamma Rig And FcRn And Design Of IgG1 Variants With Improved Binding To The Fc gamma R,” J. Biol. Chem. 276:6591-6604; Idusogie, E. E. et al. (2000) “Mapping Of The C1q Binding Site On Rituxan, A Chimeric Antibody With A Human IgG Fc,” J. Immunol. 164:4178-84; Reddy, M. P. et al. (2000) “Elimination Of Fc Receptor-Dependent Effector Functions Of A Modified IgG4 Monoclonal Antibody To Human CD4,” J. Immunol. 164:1925-1933; Xu, D. et al. (2000) “In Vitro Characterization of Five Humanized OKT3 Effector Function Variant Antibodies,” Cell. Immunol. 200:16-26; Armour, K. L. et al. (1999) “Recombinant human IgG Molecules Lacking Fcgamma Receptor I Binding And Monocyte Triggering Activities,” Eur. J. Immunol. 29:2613-24; Jefferis, R. et al. (1996) “Modulation Of Fc(Gamma)R And Human Complement Activation By IgG3-Core Oligosaccharide Interactions,” Immunol. Lett. 54:101-04; Lund, J. et al. (1996) “Multiple Interactions Of IgG With Its Core Oligosaccharide Can Modulate Recognition By Complement And Human Fc Gamma Receptor I And Influence The Synthesis Of Its Oligosaccharide Chains,” J. Immunol. 157:4963-4969; Hutchins et al. (1995) “Improved Biodistribution, Tumor Targeting, And Reduced Immunogenicity In Mice With A Gamma 4 Variant Of Campath-1H,” Proc. Natl. Acad. Sci. (U.S.A.) 92:11980-84; Jefferis, R. et al. (1995) “Recognition Sites On Human IgG For Fc Gamma Receptors: The Role Of Glycosylation,” Immunol. Lett. 44:111-17; Lund, J. et al. (1995) “Oligosaccharide-Protein Interactions In IgG Can Modulate Recognition By Fc Gamma Receptors,” FASEB J. 9:115-19; Alegre, M. L. et al. (1994) “A Non-Activating “Humanized” Anti-CD3 Monoclonal Antibody Retains Immunosuppressive Properties In Vivo,” Transplantation 57:1537-1543; Lund et al. (1992) “Multiple Binding Sites On The CH2 Domain Of IgG For Mouse Fc Gamma R11,” Mol. Immunol. 29:53-59; Lund et al. (1991) “Human Fc Gamma RI And Fc Gamma RH Interact With Distinct But Overlapping Sites On Human IgG,” J. Immunol. 147:2657-2662; Duncan, A. R. et al. (1988) “Localization Of The Binding Site For The Human High-Affinity Fc Receptor On IgG,” Nature 332:563-564; U.S. Pat. Nos. 5,624,821; 5,885,573; 6,194,551; 7,276,586; and 7,317,091; and PCT Publications WO 00/42072 and PCT WO 99/58572.

(406) In some embodiments, the molecules of the invention further comprise one or more glycosylation sites, so that one or more carbohydrate moieties are covalently attached to the molecule. Preferably, the molecules of the invention with one or more glycosylation sites and/or one or more modifications in the Fc Domain confer or have an enhanced antibody-mediated effector function, e.g., enhanced ADCC activity, compared to a parent antibody. In some embodiments, the invention further comprises molecules comprising one or more modifications of amino acids that are directly or indirectly known to interact with a carbohydrate moiety of the antibody, including but not limited to amino acids at positions 241, 243, 244, 245, 245, 249, 256, 258, 260, 262, 264, 265, 296, 299, and 301. Amino acids that directly or indirectly interact with a carbohydrate moiety of an antibody are known in the art, see, e.g., Jefferis et al., 1995 Immunology Letters, 44: 111-7, which is incorporated herein by reference in its entirety.

(407) In another embodiment, the invention encompasses molecules that have been modified by introducing one or more glycosylation sites into one or more sites of the molecules, preferably without altering the functionality of the molecules, e.g., binding activity to target antigen or FcγR. Glycosylation sites may be introduced into the variable and/or constant region of the molecules of the invention. As used herein, “glycosylation sites” include any specific amino acid sequence in an antibody to which an oligosaccharide (i.e., carbohydrates containing two or more simple sugars linked together) will specifically and covalently attach. Oligosaccharide side chains are typically linked to the backbone of an antibody via either N- or O-linkages. N-linked glycosylation refers to the attachment of an oligosaccharide moiety to the side chain of an asparagine residue. O-linked glycosylation refers to the attachment of an oligosaccharide moiety to a hydroxyamino acid, e.g., serine, threonine. The molecules of the invention may comprise one or more glycosylation sites, including N-linked and O-linked glycosylation sites. Any glycosylation site for N-linked or O-linked glycosylation known in the art may be used in accordance with the instant invention. An exemplary N-linked glycosylation site that is useful in accordance with the methods of the present invention is the amino acid sequence: Asn-X-Thr/Ser, wherein X may be any amino acid and Thr/Ser indicates a threonine or a serine. Such a site or sites may be introduced into a molecule of the invention using methods well-known in the art to which this invention pertains (see for example, IN VITRO MUTAGENESIS, RECOMBINANT DNA: A SHORT COURSE, J. D. Watson, et al. W. H. Freeman and Company, New York, 1983, chapter 8, pp. 106-116, which is incorporated herein by reference in its entirety. An exemplary method for introducing a glycosylation site into a molecule of the invention may comprise: modifying or mutating an amino acid sequence of the molecule so that the desired Asn-X-Thr/Ser sequence is obtained.

(408) In some embodiments, the invention encompasses methods of modifying the carbohydrate content of a molecule of the invention by adding or deleting a glycosylation site. Methods for modifying the carbohydrate content of antibodies (and molecules comprising antibody domains) are well-known in the art and encompassed within the invention, see, e.g., U.S. Pat. No. 6,218,149; EP 0 359 096 B1; U.S. Publication No. US 2002/0028486; WO 03/035835; U.S. Publication No. 2003/0115614; U.S. Pat. Nos. 6,218,149; 6,472,511; all of which are incorporated herein by reference in their entirety. In other embodiments, the invention encompasses methods of modifying the carbohydrate content of a molecule of the invention by deleting one or more endogenous carbohydrate moieties of the molecule. In a specific embodiment, the invention encompasses shifting the glycosylation site of the Fc Domain of an antibody, by modifying positions adjacent to 297. In a specific embodiment, the invention encompasses modifying position 296 so that position 296 and not position 297 is glycosylated.

(409) Effector function can also be modified by techniques such as by introducing one or more cysteine residues into the Fc Domain, thereby allowing interchain disulfide bond formation in this region to occur, resulting in the generation of a homodimeric antibody that may have improved internalization capability and/or increased complement-mediated cell killing and ADCC (Caron, P. C. et al. (1992) “Engineered Humanized Dimeric Forms Of IgG Are More Effective Antibodies,” J. Exp. Med. 176:1191-1195; Shopes, B. (1992) “A Genetically Engineered Human IgG Mutant With Enhanced Cytolytic Activity,” J. Immunol. 148(9):2918-2922. Homodimeric antibodies with enhanced antitumor activity may also be prepared using heterobifunctional cross-linkers as described in Wolff, E. A. et al. (1993) “Monoclonal Antibody Homodimers: Enhanced Antitumor Activity In Nude Mice,” Cancer Research 53:2560-2565. Alternatively, an antibody can be engineered which has dual Fc Domains and may thereby have enhanced complement lysis and ADCC capabilities (Stevenson, G. T. et al. (1989) “A Chimeric Antibody With Dual Fc Domains (bisFabFc) Prepared By Manipulations At The IgG Hinge,” Anti-Cancer Drug Design 3:219-230).

III. Exemplary Trispecific Binding Molecules

F. gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1

(410) An exemplary Tri-Specific Binding Molecule composed of four polypeptide chains was constructed. The Tri-Specific Binding Molecule comprises the VL and VH domains of gpA33 mAb 1, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of DR5 mAb 1, and was accordingly designated “gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:212):

(411) TABLE-US-00122 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSTYAMNW VRQAPGKGLE WVGRIRSKYN NYATYYADSV KGRFTISRDD SKNSLYLQMN SLKTEDTAVY YCVRHGNFGN SYVSWFAYWG QGTLVTVSSG GCGGGEVAAL EKEVAALEKE VAALEKEVAA LEKGGGDKTH TCPPCPAPEA AGGPSVFLFP PKPKDTLMIS RTPEVTCVVV DVSHEDPEVK FNWYVDGVEV HNAKTKPREE QYNSTYRVVS VLTVLHQDWL NGKEYKCKVS NKALPAPIEK TISKAKGQPR EPQVYTLPPS REEMTKNQVS LWCLVKGFYP SDIAVEWESN GQPENNYKTT PPVLDSDGSF FLYSKLTVDK SRWQQGNVFS CSVMHEALHN HYTQKSLSLS PGK

(412) In SEQ ID NO:212, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), residues 107-114 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 115-239 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 240-245 correspond to the GGCGGG linker (SEQ ID NO:34), residues 246-273 correspond to an E-coil Domain (SEQ ID NO:39), residues 274-276 are the linker GGG, residues 277-286 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 287-503 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(413) A polynucleotide that encodes SEQ ID NO:212 is SEQ ID NO:213:

(414) TABLE-US-00123 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaaggg tggaggatcc ggcggcggag gcgaggtgca gctggtggag tctgggggag gcttggtcca gcctggaggg tccctgagac tctcctgtgc agcctctgga ttcaccttca gcacatacgc tatgaattgg gtccgccagg ctccagggaa ggggctggag tgggttggaa ggatcaggtc caagtacaac aattatgcaa cctactatgc cgactctgtg aagggtagat tcaccatctc aagagatgat tcaaagaact cactgtatct gcaaatgaac agcctgaaaa ccgaggacac ggccgtgtat tactgtgtga gacacggtaa cttcggcaat tcttacgtgt cttggtttgc ttattgggga caggggacac tggtgactgt gtcttccgga ggatgtggcg gtggagaagt ggccgcactg gagaaagagg ttgctgcttt ggagaaggag gtcgctgcac ttgaaaagga ggtcgcagcc ctggagaaag gcggcgggga caaaactcac acatgcccac cgtgcccagc acctgaagcc gcggggggac cgtcagtctt cctcttcccc ccaaaaccca aggacaccct catgatctcc cggacccctg aggtcacatg cgtggtggtg gacgtgagcc acgaagaccc tgaggtcaag ttcaactggt acgtggacgg cgtggaggtg cataatgcca agacaaagcc gcgggaggag cagtacaaca gcacgtaccg tgtggtcagc gtcctcaccg tcctgcacca ggactggctg aatggcaagg agtacaagtg caaggtctcc aacaaagccc tcccagcccc catcgagaaa accatctcca aagccaaagg gcagccccga gaaccacagg tgtacaccct gcccccatcc cgggaggaga tgaccaagaa ccaggtcagc ctgtggtgcc tggtcaaagg cttctatccc agcgacatcg ccgtggagtg ggagagcaat gggcagccgg agaacaacta caagaccacg cctcccgtgc tggactccga cggctccttc ttcctctaca gcaagctcac cgtggacaag agcaggtggc agcaggggaa cgtcttctca tgctccgtga tgcatgaggc tctgcacaac cactacacgc agaagagcct ctccctgtct ccgggtaaa

(415) The amino acid sequence of the second polypeptide chain of gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:214):

(416) TABLE-US-00124 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLVQSGAEVK KPGASVKVSC KASGYTFTGS WMNWVRQAPG QGLEWIGRIY PGDGETNYNG KFKDRVTITA DKSTSTAYME LSSLRSEDTA VYYCARIYGN NVYFDVWGQG TTVTVSSGGC GGGKVAALKE KVAALKEKVA ALKEKVAALK E

(417) In SEQ ID NO:214, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-237 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 238-243 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 244-271 are a K-coil Domain (SEQ ID NO:40).

(418) A polynucleotide that encodes SEQ ID NO:214 is (SEQ ID NO:215):

(419) TABLE-US-00125 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacaggtc cagctggtcc agagcggggc cgaagtcaaa aaacccggag caagcgtgaa ggtctcctgc aaagcatcag gctatacatt tacaggcagc tggatgaact gggtgaggca ggctccagga cagggactgg agtggatcgg gcgcatctac cctggagacg gcgaaactaa ctataatgga aagttcaaag accgagtgac catcacagcc gataagtcta ctagtaccgc ctacatggag ctgagctccc tgcggtctga agataccgcc gtctactatt gcgctagaat ttacggaaac aatgtctatt ttgacgtgtg ggggcaggga acaactgtga ctgtctcctc cggaggatgt ggcggtggaa aagtggccgc actgaaggag aaagttgctg ctttgaaaga gaaggtcgcc gcacttaagg aaaaggtcgc agccctgaaa gag

(420) The amino acid sequence of the third polypeptide chain of gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:216):

(421) TABLE-US-00126 EVKFLESGGG LVQPGGSLKL SCVASGFDFS RYWMSWVRQA PGKGLEWIGE INPDSNTINY TPSLKDKFII SRDNAKNTLY LQMTKVRSED TALYYCTRRA YYGNPAWFAY WGQGTLVTVS SASTKGPSVF PLAPSSKSTS GGTAALGCLV KDYFPEPVTV SWNSGALTSG VHTFPAVLQS SGLYSLSSVV TVPSSSLGTQ TYICNVNHKP SNTKVDKRVE PKSCDKTHTC PPCPAPEAAG GPSVFLFPPK PKDTLMISRT PEVTCVVVDV SHEDPEVKFN WYVDGVEVHN AKTKPREEQY NSTYRVVSVL TVLHQDWLNG KEYKCKVSNK ALPAPIEKTI SKAKGQPREP QVYTLPPSRE EMTKNQVSLS CAVKGFYPSD IAVEWESNGQ PENNYKTTPP VLDSDGSFFL VSKLTVDKSR WQQGNVFSCS VMHEALHNRY TQKSLSLSPG K

(422) In SEQ ID NO:216, amino acid residues 1-121 correspond to the amino acid sequence of the VH Domain of DR5 mAb 1 (SEQ ID NO:8), residues 122-219 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 220-234 correspond to a linker (SEQ ID NO:209), and residues 235-451 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(423) A polynucleotide that encodes SEQ ID NO:216 is (SEQ ID NO:217):

(424) TABLE-US-00127 gaggtgaagt ttctcgagtc tggaggtggc ctggtgcagc ctggaggatc cctgaaactc tcctgtgtag cctcaggatt cgattttagt agatactgga tgagttgggt ccggcaggct ccagggaaag ggctagaatg gattggagaa attaatccag atagcaatac gataaactat acgccatctc taaaggataa attcatcatc tccagagaca acgccaaaaa tacgctgtat ctgcaaatga ccaaagtgag atctgaggac acagcccttt attattgtac aagaagggcc tactatggta acccggcctg gtttgcttac tggggccaag ggactctggt cactgtctct tccgcctcca ccaagggccc atcggtcttc cccctggcac cctcctccaa gagcacctct gggggcacag cggccctggg ctgcctggtc aaggactact tccccgaacc ggtgacggtg tcgtggaact caggcgccct gaccagcggc gtgcacacct tcccggctgt cctacagtcc tcaggactct actccctcag cagcgtggtg accgtgccct ccagcagctt gggcacccag acctacatct gcaacgtgaa tcacaagccc agcaacacca aggtggacaa gagagttgag cccaaatctt gtgacaaaac tcacacatgc ccaccgtgcc cagcacctga agccgcgggg ggaccgtcag tcttcctctt ccccccaaaa cccaaggaca ccctcatgat ctcccggacc cctgaggtca catgcgtggt ggtggacgtg agccacgaag accctgaggt caagttcaac tggtacgtgg acggcgtgga ggtgcataat gccaagacaa agccgcggga ggagcagtac aacagcacgt accgtgtggt cagcgtcctc accgtcctgc accaggactg gctgaatggc aaggagtaca agtgcaaggt ctccaacaaa gccctcccag cccccatcga gaaaaccatc tccaaagcca aagggcagcc ccgagaacca caggtgtaca ccctgccccc atcccgggag gagatgacca agaaccaggt cagcctgagt tgcgcagtca aaggcttcta tcccagcgac atcgccgtgg agtgggagag caatgggcag ccggagaaca actacaagac cacgcctccc gtgctggact ccgacggctc cttcttcctc gtcagcaagc tcaccgtgga caagagcagg tggcagcagg ggaacgtctt ctcatgctcc gtgatgcatg aggctctgca caaccgctac acgcagaaga gcctctccct gtctccgggt aaa

(425) The amino acid sequence of the fourth polypeptide chain of gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:218):

(426) TABLE-US-00128 DIVLTQSPAS LAVSLGQRAT ISCRASKSVS SSGYSYMHWY QQKPGQPPKV LIFLSSNLDS GVPARFSGSG SGTDFTLNIH PVEDGDAATY YCQHSRDLPP TFGGGTKLEI KRTVAAPSVF IFPPSDEQLK SGTASVVCLL NNFYPREAKV QWKVDNALQS GNSQESVTEQ DSKDSTYSLS STLTLSKADY EKHKVYACEV THQGLSSPVT KSFNRGEC

(427) In SEQ ID NO:218, amino acid residues 1-111 correspond to the amino acid sequence of the VL Domain of DR5 mAb 1 (SEQ ID NO:3), and residues 112-218 correspond to the CL Kappa Domain (SEQ ID NO:210).

(428) A polynucleotide that encodes SEQ ID NO:218 is (SEQ ID NO:219):

(429) TABLE-US-00129 gacattgtgc tgacacagtc tcctgcttcc ttagctgtat ctctcgggca gagggccacc atctcatgca gggccagcaa aagtgtcagt tcctctggct atagttatat gcactggtac caacagaaac caggacagcc acccaaagtc ctcatctttc tttcatccaa cctagattct ggggtccctg ccaggttcag tggcagtggg tctgggacag acttcaccct caacatccat cctgtggagg atggggatgc tgcaacctat tactgtcagc acagtaggga tcttcctccg acgttcggtg gaggcaccaa gctggaaatc aaacgtacgg tggctgcacc atcggtcttc atcttcccgc catctgatga gcagttgaaa tctggaactg cctctgttgt gtgcctgctg aataacttct atcccagaga ggccaaagta cagtggaagg tggataacgc cctccaatcg ggtaactccc aggagagtgt cacagagcag gacagcaagg acagcaccta cagcctcagc agcaccctga cgctgagcaa agcagactac gagaaacaca aagtctacgc ctgcgaagtc acccatcagg gcctgagctc gcccgtcaca aagagcttca acaggggaga gtgt

G. gpA33 mAb 1×CD3 mAb 2×DR5 mAb 2

(430) A second exemplary Tri-Specific Binding Molecule composed of four polypeptide chains was constructed. The Tri-Specific Binding Molecule comprises the VL and VH domains of gpA33 mAb 1, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of DR5 mAb 2, and was accordingly designated “gpA33 mAb 1×CD3 mAb 2×DR5 mAb 2.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:220):

(431) TABLE-US-00130 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSTYAMNW VRQAPGKGLE WVGRIRSKYN NYATYYADSV KGRFTISRDD SKNSLYLQMN SLKTEDTAVY YCVRHGNFGN SYVSWFAYWG QGTLVTVSSG GCGGGEVAAL EKEVAALEKE VAALEKEVAA LEKGGGDKTH TCPPCPAPEA AGGPSVFLFP PKPKDTLMIS RTPEVTCVVV DVSHEDPEVK FNWYVDGVEV HNAKTKPREE QYNSTYRVVS VLTVLHQDWL NGKEYKCKVS NKALPAPIEK TISKAKGQPR EPQVYTLPPS REEMTKNQVS LWCLVKGFYP SDIAVEWESN GQPENNYKTT PPVLDSDGSF FLYSKLTVDK SRWQQGNVFS CSVMHEALHN HYTQKSLSLS PGK

(432) In SEQ ID NO:220, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), residues 107-114 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 115-239 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 240-245 correspond to the GGCGGG linker (SEQ ID NO:34), residues 246-273 correspond to an E-coil Domain (SEQ ID NO:39), residues 274-276 are the linker GGG, residues 277-286 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 287-503 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(433) A polynucleotide that encodes SEQ ID NO:220 is (SEQ ID NO:221):

(434) TABLE-US-00131 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaaggg tggaggatcc ggcggcggag gcgaggtgca gctggtggag tctgggggag gcttggtcca gcctggaggg tccctgagac tctcctgtgc agcctctgga ttcaccttca gcacatacgc tatgaattgg gtccgccagg ctccagggaa ggggctggag tgggttggaa ggatcaggtc caagtacaac aattatgcaa cctactatgc cgactctgtg aagggtagat tcaccatctc aagagatgat tcaaagaact cactgtatct gcaaatgaac agcctgaaaa ccgaggacac ggccgtgtat tactgtgtga gacacggtaa cttcggcaat tcttacgtgt cttggtttgc ttattgggga caggggacac tggtgactgt gtcttccgga ggatgtggcg gtggagaagt ggccgcactg gagaaagagg ttgctgcttt ggagaaggag gtcgctgcac ttgaaaagga ggtcgcagcc ctggagaaag gcggcgggga caaaactcac acatgcccac cgtgcccagc acctgaagcc gcggggggac cgtcagtctt cctcttcccc ccaaaaccca aggacaccct catgatctcc cggacccctg aggtcacatg cgtggtggtg gacgtgagcc acgaagaccc tgaggtcaag ttcaactggt acgtggacgg cgtggaggtg cataatgcca agacaaagcc gcgggaggag cagtacaaca gcacgtaccg tgtggtcagc gtcctcaccg tcctgcacca ggactggctg aatggcaagg agtacaagtg caaggtctcc aacaaagccc tcccagcccc catcgagaaa accatctcca aagccaaagg gcagccccga gaaccacagg tgtacaccct gcccccatcc cgggaggaga tgaccaagaa ccaggtcagc ctgtggtgcc tggtcaaagg cttctatccc agcgacatcg ccgtggagtg ggagagcaat gggcagccgg agaacaacta caagaccacg cctcccgtgc tggactccga cggctccttc ttcctctaca gcaagctcac cgtggacaag agcaggtggc agcaggggaa cgtcttctca tgctccgtga tgcatgaggc tctgcacaac cactacacgc agaagagcct ctccctgtct ccgggtaaa

(435) The amino acid sequence of the second polypeptide chain of gpA33 mAb 1×CD3 mAb 2×DR5 mAb 2 is (SEQ ID NO:222):

(436) TABLE-US-00132 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGINKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLVQSGAEVK KPGASVKVSC KASGYTFTGS WMNWVRQAPG QGLEWIGRIY PGDGETNYNG KFKDRVTITA DKSTSTAYME LSSLRSEDTA VYYCARIYGN NVYFDVWGQG TTVTVSSGGC GGGKVAALKE KVAALKEKVA ALKEKVAALK E

(437) In SEQ ID NO:222, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-237 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 238-243 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 244-271 are a K-coil Domain (SEQ ID NO:40).

(438) A polynucleotide that encodes SEQ ID NO:222 is (SEQ ID NO:223):

(439) TABLE-US-00133 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacaggtc cagctggtcc agagcggggc cgaagtcaaa aaacccggag caagcgtgaa ggtctcctgc aaagcatcag gctatacatt tacaggcagc tggatgaact gggtgaggca ggctccagga cagggactgg agtggatcgg gcgcatctac cctggagacg gcgaaactaa ctataatgga aagttcaaag accgagtgac catcacagcc gataagtcta ctagtaccgc ctacatggag ctgagctccc tgcggtctga agataccgcc gtctactatt gcgctagaat ttacggaaac aatgtctatt ttgacgtgtg ggggcaggga acaactgtga ctgtctcctc cggaggatgt ggcggtggaa aagtggccgc actgaaggag aaagttgctg ctttgaaaga gaaggtcgcc gcacttaagg aaaaggtcgc agccctgaaa gag

(440) The amino acid sequence of the third polypeptide chain of gpA33 mAb 1×CD3 mAb 2×DR5 mAb 2 is (SEQ ID NO:224):

(441) TABLE-US-00134 KVQLQQSGAE LVKPGASVKL SCKASGYTFT EYILHWVKQK SGQGLEWIGW FYPGNNNIKY NEKFKDKATL TADKSSSTVY MELSRLTSED SAVYFCARHE QGPGYFDYWG QGTTLTVSSA STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY ICNVNHKPSN TKVDKRVEPK SCDKTHTCPP CPAPEAAGGP SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLSCA VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLVS KLTVDKSRWQ QGNVFSCSVM HEALHNRYTQ KSLSLSPGK

(442) In SEQ ID NO:224, amino acid residues 1-119 correspond to the amino acid sequence of the VH Domain of DR5 mAb 2 (SEQ ID NO:18), residues 120-217 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 218-232 correspond to a linker (SEQ ID NO:209), and residues 233-449 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(443) A polynucleotide that encodes SEQ ID NO:224 is (SEQ ID NO:225):

(444) TABLE-US-00135 aaggtccagc tgcagcagtc tggagctgaa ctggtgaaac ccggggcatc agtgaagctg tcctgcaagg cttctgggta caccttcact gagtatattt tacactgggt aaagcagaag tctggacagg gtcttgagtg gattgggtgg ttttatcctg gaaataataa tataaagtac aatgagaaat tcaaggacaa ggccacactg actgcggaca aatcctccag cacagtctat atggaactta gtagattgac atctgaagac tctgcggtct atttctgtgc aagacacgaa caaggaccag gttactttga ctactggggc caaggcacca ctctcacagt ctcctccgcc tccaccaagg gcccatcggt cttccccctg gcaccctcct ccaagagcac ctctgggggc acagcggccc tgggctgcct ggtcaaggac tacttccccg aaccggtgac ggtgtcgtgg aactcaggcg ccctgaccag cggcgtgcac accttcccgg ctgtcctaca gtcctcagga ctctactccc tcagcagcgt ggtgaccgtg ccctccagca gcttgggcac ccagacctac atctgcaacg tgaatcacaa gcccagcaac accaaggtgg acaagagagt tgagcccaaa tcttgtgaca aaactcacac atgcccaccg tgcccagcac ctgaagccgc ggggggaccg tcagtcttcc tcttcccccc aaaacccaag gacaccctca tgatctcccg gacccctgag gtcacatgcg tggtggtgga cgtgagccac gaagaccctg aggtcaagtt caactggtac gtggacggcg tggaggtgca taatgccaag acaaagccgc gggaggagca gtacaacagc acgtaccgtg tggtcagcgt cctcaccgtc ctgcaccagg actggctgaa tggcaaggag tacaagtgca aggtctccaa caaagccctc ccagccccca tcgagaaaac catctccaaa gccaaagggc agccccgaga accacaggtg tacaccctgc ccccatcccg ggaggagatg accaagaacc aggtcagcct gagttgcgca gtcaaaggct tctatcccag cgacatcgcc gtggagtggg agagcaatgg gcagccggag aacaactaca agaccacgcc tcccgtgctg gactccgacg gctccttctt cctcgtcagc aagctcaccg tggacaagag caggtggcag caggggaacg tcttctcatg ctccgtgatg catgaggctc tgcacaaccg ctacacgcag aagagcctct ccctgtctcc gggtaaa

(445) The amino acid sequence of the fourth polypeptide chain of gpA33 mAb 1×CD3 mAb 2×DR5 mAb 2 is (SEQ ID NO:226):

(446) TABLE-US-00136 DIVMTQSHKF MSTSVGDRVS ITCKASQDVN TAVAWYQQKP GQSPKLLIYW ASTRHTGVPD RFTGSGSGTD YTLTIKSVQA EDLTLYYCQQ HYITPWTFGG GTKLEIKRTV AAPSVFIFPP SDEQLKSGTA SVVCLLNNFY PREAKVQWKV DNALQSGNSQ ESVTEQDSKD STYSLSSTLT LSKADYEKHK VYACEVTHQG LSSPVTKSFN RGEC

(447) In SEQ ID NO:226, amino acid residues 1-107 correspond to the amino acid sequence of the VL Domain of DR5 mAb 2 (SEQ ID NO:13), and residues 108-214 correspond to the CL Kappa Domain (SEQ ID NO:210).

(448) A polynucleotide that encodes SEQ ID NO:226 is (SEQ ID NO:227):

(449) TABLE-US-00137 gacattgtga tgacccagtc tcacaaattc atgtccactt cagtaggaga cagggtcagc atcacctgca aggccagtca ggatgtgaat actgctgtag cctggtatca acaaaaacca gggcaatctc ctaaactact gatttactgg gcatccaccc ggcacactgg agtccctgat cgcttcacag gcagtggatc tgggacagat tatacactca ccatcaaaag tgtgcaggct gaagacctga cactttatta ctgtcagcaa cactatatca ctccgtggac gttcggtgga ggcaccaagc tggaaatcaa acgtacggtg gctgcaccat cggtcttcat cttcccgcca tctgatgagc agttgaaatc tggaactgcc tctgttgtgt gcctgctgaa taacttctat cccagagagg ccaaagtaca gtggaaggtg gataacgccc tccaatcggg taactcccag gagagtgtca cagagcagga cagcaaggac agcacctaca gcctcagcag caccctgacg ctgagcaaag cagactacga gaaacacaaa gtctacgcct gcgaagtcac ccatcagggc ctgagctcgc ccgtcacaaa gagcttcaac aggggagagt gt

H. EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1

(450) A further exemplary Tri-Specific Binding Molecule composed of four polypeptide chains was constructed. The Tri-Specific Binding Molecule comprises the VL and VH domains of EphA2 mAb 1, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of DR5 mAb 1, and was accordingly designated “EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:228):

(451) TABLE-US-00138 DIQMTQTTSS LSASLGDRIT ISCRASQDIS NYLNWYQQKP DGTVKLLIYY TSRLHSGVPS RFSGSGSGTD YSLTISNLEQ EDIATYFCQQ GYTLYTFGGG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSTYAMNW VRQAPGKGLE WVGRIRSKYN NYATYYADSV KGRFTISRDD SKNSLYLQMN SLKTEDTAVY YCVRHGNFGN SYVSWFAYWG QGTLVTVSSG GCGGGEVAAL EKEVAALEKE VAALEKEVAA LEKGGGDKTH TCPPCPAPEA AGGPSVFLFP PKPKDTLMIS RTPEVTCVVV DVSHEDPEVK FNWYVDGVEV HNAKTKPREE QYNSTYRVVS VLTVLHQDWL NGKEYKCKVS NKALPAPIEK TISKAKGQPR EPQVYTLPPS REEMTKNQVS LWCLVKGFYP SDIAVEWESN GQPENNYKTT PPVLDSDGSF FLYSKLTVDK SRWQQGNVFS CSVMHEALHN HYTQKSLSLS PGK

(452) In SEQ ID NO:228, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 1 (SEQ ID NO:153), residues 107-114 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 115-239 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 240-245 correspond to the GGCGGG linker (SEQ ID NO:34), residues 246-273 correspond to an E-coil Domain (SEQ ID NO:39), residues 274-276 are the linker GGG, residues 277-286 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 287-503 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(453) A polynucleotide that encodes SEQ ID NO:228 is (SEQ ID NO:229):

(454) TABLE-US-00139 gatatccaga tgacacagac tacatcctcc ctgtctgcct ctctgggaga cagaatcacc atcagttgca gggcaagtca ggacattagc aattatttaa actggtatca gcagaaacca gatggaactg ttaaactcct gatctactac acatcaagat tacactcagg agtcccatca aggttcagtg gcagtgggtc tggaacagat tattctctca ccattagcaa cctggagcaa gaagatattg ccacttactt ttgccaacag ggttatacgc tgtacacgtt cggagggggg accaagctgg aaataaaagg tggaggatcc ggcggcggag gcgaggtgca gctggtggag tctgggggag gcttggtcca gcctggaggg tccctgagac tctcctgtgc agcctctgga ttcaccttca gcacatacgc tatgaattgg gtccgccagg ctccagggaa ggggctggag tgggttggaa ggatcaggtc caagtacaac aattatgcaa cctactatgc cgactctgtg aagggtagat tcaccatctc aagagatgat tcaaagaact cactgtatct gcaaatgaac agcctgaaaa ccgaggacac ggccgtgtat tactgtgtga gacacggtaa cttcggcaat tcttacgtgt cttggtttgc ttattgggga caggggacac tggtgactgt gtcttccgga ggatgtggcg gtggagaagt ggccgcactg gagaaagagg ttgctgcttt ggagaaggag gtcgctgcac ttgaaaagga ggtcgcagcc ctggagaaag gcggcgggga caaaactcac acatgcccac cgtgcccagc acctgaagcc gcggggggac cgtcagtctt cctcttcccc ccaaaaccca aggacaccct catgatctcc cggacccctg aggtcacatg cgtggtggtg gacgtgagcc acgaagaccc tgaggtcaag ttcaactggt acgtggacgg cgtggaggtg cataatgcca agacaaagcc gcgggaggag cagtacaaca gcacgtaccg tgtggtcagc gtcctcaccg tcctgcacca ggactggctg aatggcaagg agtacaagtg caaggtctcc aacaaagccc tcccagcccc catcgagaaa accatctcca aagccaaagg gcagccccga gaaccacagg tgtacaccct gcccccatcc cgggaggaga tgaccaagaa ccaggtcagc ctgtggtgcc tggtcaaagg cttctatccc agcgacatcg ccgtggagtg ggagagcaat gggcagccgg agaacaacta caagaccacg cctcccgtgc tggactccga cggctccttc ttcctctaca gcaagctcac cgtggacaag agcaggtggc agcaggggaa cgtcttctca tgctccgtga tgcatgaggc tctgcacaac cactacacgc agaagagcct ctccctgtct ccgggtaa

(455) The amino acid sequence of the second polypeptide chain of EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:230):

(456) TABLE-US-00140 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGINKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLKESGPGLV APSQSLSITC TVSGFSLSRY SVHWVRQPPG KGLEWLGMIW GGGSTDYNSA LKSRLSISKD NSKSQVFLKM NSLQTDDTAM YYCARKHGNY YTMDYWGQGT SVTVSSGGCG GGKVAALKEK VAALKEKVAA LKEKVAALKE

(457) In SEQ ID NO:230, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-236 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 1 (SEQ ID NO:158), residues 237-242 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 243-270 are a K-coil Domain (SEQ ID NO:40).

(458) A polynucleotide that encodes SEQ ID NO:230 is (SEQ ID NO:231):

(459) TABLE-US-00141 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacaggtg cagctgaagg agtcaggacc tggcctggtg gcaccctcac agagcctgtc catcacatgc actgtctctg ggttctcatt atccagatat agtgtacact gggttcgcca gcctccagga aagggtctgg agtggctggg aatgatatgg ggtggtggaa gcacagacta taattcagct ctcaaatcca gactgagtat cagcaaggac aactccaaga gccaagtttt cttaaaaatg aacagtctgc aaactgatga cacagccatg tactactgtg ccagaaaaca tggtaactac tatactatgg actactgggg tcaaggaacc tcagtcaccg tctcctccgg aggatgtggc ggtggaaaag tggccgcact gaaggagaaa gttgctgctt tgaaagagaa ggtcgccgca cttaaggaaa aggtcgcagc cctgaaagag

(460) The amino acid sequence of the third polypeptide chain of EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:232):

(461) TABLE-US-00142 EVKFLESGGG LVQPGGSLKL SCVASGFDFS RYWMSWVRQA PGKGLEWIGE INPDSNTINY TPSLKDKFII SRDNAKNTLY LQMTKVRSED TALYYCTRRA YYGNPAWFAY WGQGTLVTVS SASTKGPSVF PLAPSSKSTS GGTAALGCLV KDYFPEPVTV SWNSGALTSG VHTFPAVLQS SGLYSLSSVV TVPSSSLGTQ TYICNVNHKP SNTKVDKRVE PKSCDKTHTC PPCPAPEAAG GPSVFLFPPK PKDTLMISRT PEVTCVVVDV SHEDPEVKFN WYVDGVEVHN AKTKPREEQY NSTYRVVSVL TVLHQDWLNG KEYKCKVSNK ALPAPIEKTI SKAKGQPREP QVYTLPPSRE EMTKNQVSLS CAVKGFYPSD IAVEWESNGQ PENNYKTTPP VLDSDGSFFL VSKLTVDKSR WQQGNVFSCS VMHEALHNRY TQKSLSLSPG K

(462) In SEQ ID NO:232, amino acid residues 1-121 correspond to the amino acid sequence of the VH Domain of DR5 mAb 1 (SEQ ID NO:8), residues 122-219 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 220-234 correspond to a linker (SEQ ID NO:209), and residues 235-451 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(463) A polynucleotide that encodes SEQ ID NO:232 is (SEQ ID NO:233):

(464) TABLE-US-00143 gaggtgaagt ttctcgagtc tggaggtggc ctggtgcagc ctggaggatc cctgaaactc tcctgtgtag cctcaggatt cgattttagt agatactgga tgagttgggt ccggcaggct ccagggaaag ggctagaatg gattggagaa attaatccag atagcaatac gataaactat acgccatctc taaaggataa attcatcatc tccagagaca acgccaaaaa tacgctgtat ctgcaaatga ccaaagtgag atctgaggac acagcccttt attattgtac aagaagggcc tactatggta acccggcctg gtttgcttac tggggccaag ggactctggt cactgtctct tccgcctcca ccaagggccc atcggtcttc cccctggcac cctcctccaa gagcacctct gggggcacag cggccctggg ctgcctggtc aaggactact tccccgaacc ggtgacggtg tcgtggaact caggcgccct gaccagcggc gtgcacacct tcccggctgt cctacagtcc tcaggactct actccctcag cagcgtggtg accgtgccct ccagcagctt gggcacccag acctacatct gcaacgtgaa tcacaagccc agcaacacca aggtggacaa gagagttgag cccaaatctt gtgacaaaac tcacacatgc ccaccgtgcc cagcacctga agccgcgggg ggaccgtcag tcttcctctt ccccccaaaa cccaaggaca ccctcatgat ctcccggacc cctgaggtca catgcgtggt ggtggacgtg agccacgaag accctgaggt caagttcaac tggtacgtgg acggcgtgga ggtgcataat gccaagacaa agccgcggga ggagcagtac aacagcacgt accgtgtggt cagcgtcctc accgtcctgc accaggactg gctgaatggc aaggagtaca agtgcaaggt ctccaacaaa gccctcccag cccccatcga gaaaaccatc tccaaagcca aagggcagcc ccgagaacca caggtgtaca ccctgccccc atcccgggag gagatgacca agaaccaggt cagcctgagt tgcgcagtca aaggcttcta tcccagcgac atcgccgtgg agtgggagag caatgggcag ccggagaaca actacaagac cacgcctccc gtgctggact ccgacggctc cttcttcctc gtcagcaagc tcaccgtgga caagagcagg tggcagcagg ggaacgtctt ctcatgctcc gtgatgcatg aggctctgca caaccgctac acgcagaaga gcctctccct gtctccgggt aaa

(465) The amino acid sequence of the fourth polypeptide chain of EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:234):

(466) TABLE-US-00144 DIVLTQSPAS LAVSLGQRAT ISCRASKSVS SSGYSYMHWY QQKPGQPPKV LIFLSSNLDS GVPARFSGSG SGTDFTLNIH PVEDGDAATY YCQHSRDLPP TFGGGTKLEI KRTVAAPSVF IFPPSDEQLK SGTASVVCLL NNFYPREAKV QWKVDNALQS GNSQESVTEQ DSKDSTYSLS STLTLSKADY EKHKVYACEV THQGLSSPVT KSFNRGEC

(467) In SEQ ID NO:234, amino acid residues 1-111 correspond to the amino acid sequence of the VL Domain of DR5 mAb 1 (SEQ ID NO:3), and residues 112-218 correspond to the CL Kappa Domain (SEQ ID NO:210).

(468) A polynucleotide that encodes SEQ ID NO:234 is (SEQ ID NO:235):

(469) TABLE-US-00145 gacattgtgc tgacacagtc tcctgcttcc ttagctgtat ctctcgggca gagggccacc atctcatgca gggccagcaa aagtgtcagt tcctctggct atagttatat gcactggtac caacagaaac caggacagcc acccaaagtc ctcatctttc tttcatccaa cctagattct ggggtccctg ccaggttcag tggcagtggg tctgggacag acttcaccct caacatccat cctgtggagg atggggatgc tgcaacctat tactgtcagc acagtaggga tcttcctccg acgttcggtg gaggcaccaa gctggaaatc aaacgtacgg tggctgcacc atcggtcttc atcttcccgc catctgatga gcagttgaaa tctggaactg cctctgttgt gtgcctgctg aataacttct atcccagaga ggccaaagta cagtggaagg tggataacgc cctccaatcg ggtaactccc aggagagtgt cacagagcag gacagcaagg acagcaccta cagcctcagc agcaccctga cgctgagcaa agcagactac gagaaacaca aagtctacgc ctgcgaagtc acccatcagg gcctgagctc gcccgtcaca aagagcttca acaggggaga gtgt

I. EphA2 mAb 2×CD3 mAb 2×DR5 mAb 1

(470) A further exemplary Tri-Specific Binding Molecule composed of four polypeptide chains was constructed. The Tri-Specific Binding Molecule comprises the VL and VH domains of EphA2 mAb 2, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of DR5 mAb 1, and was accordingly designated “EphA2 mAb 2×CD3 mAb 2×DR5 mAb 1.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:236):

(471) TABLE-US-00146 DVVMTQTPLS LPVSLGDQAS ISCRSSQSLV HSSGNTYLHW YLQKPGQSPK LLIYKVSNRF SGVPDRFSGS GSGTDFTLKI SRVEAEDLGV YFCSQSTHVP TFGSGTKLEI KGGGSGGGGE VQLVESGGGL VQPGGSLRLS CAASGFTFST YAMNWVRQAP GKGLEWVGRI RSKYNNYATY YADSVKGRFT ISRDDSKNSL YLQMNSLKTE DTAVYYCVRH GNFGNSYVSW FAYWGQGTLV TVSSGGCGGG EVAALEKEVA ALEKEVAALE KEVAALEKGG GDKTHTCPPC PAPEAAGGPS VFLFPPKPKD TLMISRTPEV TCVVVDVSHE DPEVKFNWYV DGVEVHNAKT KPREEQYNST YRVVSVLTVL HQDWLNGKEY KCKVSNKALP APIEKTISKA KGQPREPQVY TLPPSREEMT KNQVSLWCLV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLYSK LTVDKSRWQQ GNVFSCSVMH EALHNHYTQK SLSLSPGK

(472) In SEQ ID NO:236, amino acid residues 1-111 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 2 (SEQ ID NO:163), residues 112-119 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 120-244 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 245-250 correspond to the GGCGGG linker (SEQ ID NO:34), residues 251-278 correspond to an E-coil Domain (SEQ ID NO:39), residues 279-281 are the linker GGG, residues 282-291 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 292-508 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(473) A polynucleotide that encodes SEQ ID NO:236 is (SEQ ID NO:237):

(474) TABLE-US-00147 gatgttgtga tgacccaaac tccactctcc ctgcctgtca gtcttggaga tcaagcctcc atctcttgca gatctagtca gagccttgta cacagtagtg gaaacaccta tttacattgg tacctgcaga agccaggcca gtctccaaag ctcctgatct acaaagtttc caaccgattt tctggggtcc cagacaggtt cagtggcagt ggatcaggga cagatttcac actcaagatc agcagagtgg aggctgagga tctgggagtt tatttctgct ctcaaagtac acatgttccc acgttcggct cggggacaaa gttggaaata aaaggtggag gatccggcgg cggaggcgag gtgcagctgg tggagtctgg gggaggcttg gtccagcctg gagggtccct gagactctcc tgtgcagcct ctggattcac cttcagcaca tacgctatga attgggtccg ccaggctcca gggaaggggc tggagtgggt tggaaggatc aggtccaagt acaacaatta tgcaacctac tatgccgact ctgtgaaggg tagattcacc atctcaagag atgattcaaa gaactcactg tatctgcaaa tgaacagcct gaaaaccgag gacacggccg tgtattactg tgtgagacac ggtaacttcg gcaattctta cgtgtcttgg tttgcttatt ggggacaggg gacactggtg actgtgtctt ccggaggatg tggcggtgga gaagtggccg cactggagaa agaggttgct gctttggaga aggaggtcgc tgcacttgaa aaggaggtcg cagccctgga gaaaggcggc ggggacaaaa ctcacacatg cccaccgtgc ccagcacctg aagccgcggg gggaccgtca gtcttcctct tccccccaaa acccaaggac accctcatga tctcccggac ccctgaggtc acatgcgtgg tggtggacgt gagccacgaa gaccctgagg tcaagttcaa ctggtacgtg gacggcgtgg aggtgcataa tgccaagaca aagccgcggg aggagcagta caacagcacg taccgtgtgg tcagcgtcct caccgtcctg caccaggact ggctgaatgg caaggagtac aagtgcaagg tctccaacaa agccctccca gcccccatcg agaaaaccat ctccaaagcc aaagggcagc cccgagaacc acaggtgtac accctgcccc catcccggga ggagatgacc aagaaccagg tcagcctgtg gtgcctggtc aaaggcttct atcccagcga catcgccgtg gagtgggaga gcaatgggca gccggagaac aactacaaga ccacgcctcc cgtgctggac tccgacggct ccttcttcct ctacagcaag ctcaccgtgg acaagagcag gtggcagcag gggaacgtct tctcatgctc cgtgatgcat gaggctctgc acaaccacta cacgcagaag agcctctccc tgtctccggg taaa

(475) The amino acid sequence of the second polypeptide chain of EphA2 mAb 2×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:238):

(476) TABLE-US-00148 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQI QLVQSGPELK KPGETVKISC KASGFTFTNY GMNWVKQAPG KGLKWMGWIN TYIGEPTYAD DFKGRFVFSL ETSASTAYLQ INNLKNEDMA TYFCARELGP YYFDYWGQGT TLTVSSGGCG GGKVAALKEK VAALKEKVAA LKEKVAALKE

(477) In SEQ ID NO:238, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-236 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 2 (SEQ ID NO:167), residues 237-242 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 243-270 are a K-coil Domain (SEQ ID NO:40).

(478) A polynucleotide that encodes SEQ ID NO:238 is (SEQ ID NO:239):

(479) TABLE-US-00149 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacagatc cagttggtgc agtctggacc tgagctgaag aagcctggag agacagtcaa gatctcctgc aaggcttctg ggtttacctt cacaaactat ggaatgaact gggtgaagca ggctccagga aagggtttaa agtggatggg ctggataaac acctatattg gagagccgac atatgctgat gacttcaagg gacggtttgt cttctctttg gaaacctctg ccagcactgc ctatttgcag atcaacaacc tcaaaaatga ggacatggcc acatatttct gtgcaagaga actgggacca tactactttg actactgggg ccaaggcacc actctcacag tctcctccgg aggatgtggc ggtggaaaag tggccgcact gaaggagaaa gttgctgctt tgaaagagaa ggtcgccgca cttaaggaaa aggtcgcagc cctgaaagag

(480) The amino acid sequence of the third polypeptide chain of EphA2 mAb 2×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:240):

(481) TABLE-US-00150 EVKFLESGGG LVQPGGSLKL SCVASGFDFS RYWMSWVRQA PGKGLEWIGE INPDSNTINY TPSLKDKFII SRDNAKNTLY LQMTKVRSED TALYYCTRRA YYGNPAWFAY WGQGTLVTVS SASTKGPSVF PLAPSSKSTS GGTAALGCLV KDYFPEPVTV SWNSGALTSG VHTFPAVLQS SGLYSLSSVV TVPSSSLGTQ TYICNVNHKP SNTKVDKRVE PKSCDKTHTC PPCPAPEAAG GPSVFLFPPK PKDTLMISRT PEVTCVVVDV SHEDPEVKFN WYVDGVEVHN AKTKPREEQY NSTYRVVSVL TVLHQDWLNG KEYKCKVSNK ALPAPIEKTI SKAKGQPREP QVYTLPPSRE EMTKNQVSLS CAVKGFYPSD IAVEWESNGQ PENNYKTTPP VLDSDGSFFL VSKLTVDKSR WQQGNVFSCS VMHEALHNRY TQKSLSLSPG K

(482) In SEQ ID NO:240, amino acid residues 1-121 correspond to the amino acid sequence of the VH Domain of DR5 mAb 1 (SEQ ID NO:8), residues 122-219 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 220-234 correspond to a linker (SEQ ID NO:209), and residues 235-451 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(483) A polynucleotide that encodes SEQ ID NO:240 is (SEQ ID NO:241):

(484) TABLE-US-00151 gaggtgaagt ttctcgagtc tggaggtggc ctggtgcagc ctggaggatc cctgaaactc tcctgtgtag cctcaggatt cgattttagt agatactgga tgagttgggt ccggcaggct ccagggaaag ggctagaatg gattggagaa attaatccag atagcaatac gataaactat acgccatctc taaaggataa attcatcatc tccagagaca acgccaaaaa tacgctgtat ctgcaaatga ccaaagtgag atctgaggac acagcccttt attattgtac aagaagggcc tactatggta acccggcctg gtttgcttac tggggccaag ggactctggt cactgtctct tccgcctcca ccaagggccc atcggtcttc cccctggcac cctcctccaa gagcacctct gggggcacag cggccctggg ctgcctggtc aaggactact tccccgaacc ggtgacggtg tcgtggaact caggcgccct gaccagcggc gtgcacacct tcccggctgt cctacagtcc tcaggactct actccctcag cagcgtggtg accgtgccct ccagcagctt gggcacccag acctacatct gcaacgtgaa tcacaagccc agcaacacca aggtggacaa gagagttgag cccaaatctt gtgacaaaac tcacacatgc ccaccgtgcc cagcacctga agccgcgggg ggaccgtcag tcttcctctt ccccccaaaa cccaaggaca ccctcatgat ctcccggacc cctgaggtca catgcgtggt ggtggacgtg agccacgaag accctgaggt caagttcaac tggtacgtgg acggcgtgga ggtgcataat gccaagacaa agccgcggga ggagcagtac aacagcacgt accgtgtggt cagcgtcctc accgtcctgc accaggactg gctgaatggc aaggagtaca agtgcaaggt ctccaacaaa gccctcccag cccccatcga gaaaaccatc tccaaagcca aagggcagcc ccgagaacca caggtgtaca ccctgccccc atcccgggag gagatgacca agaaccaggt cagcctgagt tgcgcagtca aaggcttcta tcccagcgac atcgccgtgg agtgggagag caatgggcag ccggagaaca actacaagac cacgcctccc gtgctggact ccgacggctc cttcttcctc gtcagcaagc tcaccgtgga caagagcagg tggcagcagg ggaacgtctt ctcatgctcc gtgatgcatg aggctctgca caaccgctac acgcagaaga gcctctccct gtctccgggt aaa

(485) The amino acid sequence of the fourth polypeptide chain of EphA2 mAb 2×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:242):

(486) TABLE-US-00152 DIVLTQSPAS LAVSLGQRAT ISCRASKSVS SSGYSYMHWY QQKPGQPPKV LIFLSSNLDS GVPARFSGSG SGTDFTLNIH PVEDGDAATY YCQHSRDLPP TFGGGTKLEI KRTVAAPSVF IFPPSDEQLK SGTASVVCLL NNFYPREAKV QWKVDNALQS GNSQESVTEQ DSKDSTYSLS STLTLSKADY EKHKVYACEV THQGLSSPVT KSFNRGEC

(487) In SEQ ID NO:242, amino acid residues 1-111 correspond to the amino acid sequence of the VL Domain of DR5 mAb 1 (SEQ ID NO:3), and residues 112-218 correspond to the CL Kappa Domain (SEQ ID NO:210).

(488) A polynucleotide that encodes SEQ ID NO:242 is (SEQ ID NO:243):

(489) TABLE-US-00153 gacattgtgc tgacacagtc tcctgcttcc ttagctgtat ctctcgggca gagggccacc atctcatgca gggccagcaa aagtgtcagt tcctctggct atagttatat gcactggtac caacagaaac caggacagcc acccaaagtc ctcatctttc tttcatccaa cctagattct ggggtccctg ccaggttcag tggcagtggg tctgggacag acttcaccct caacatccat cctgtggagg atggggatgc tgcaacctat tactgtcagc acagtaggga tcttcctccg acgttcggtg gaggcaccaa gctggaaatc aaacgtacgg tggctgcacc atcggtcttc atcttcccgc catctgatga gcagttgaaa tctggaactg cctctgttgt gtgcctgctg aataacttct atcccagaga ggccaaagta cagtggaagg tggataacgc cctccaatcg ggtaactccc aggagagtgt cacagagcag gacagcaagg acagcaccta cagcctcagc agcaccctga cgctgagcaa agcagactac gagaaacaca aagtctacgc ctgcgaagtc acccatcagg gcctgagctc gcccgtcaca aagagcttca acaggggaga gtgt

J. EphA2 mAb 3×CD3 mAb 2×DR5 mAb 1

(490) A further exemplary Tri-Specific Binding Molecule composed of four polypeptide chains was constructed. The Tri-Specific Binding Molecule comprises the VL and VH domains of EphA2 mAb 3, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of DR5 mAb 1, and was accordingly designated “EphA2 mAb 3×CD3 mAb 2×DR5 mAb 1.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:244):

(491) TABLE-US-00154 DIVLTQSHRS MSTSVGDRVN ITCKASQDVT TAVAWYQQKP GQSPKLLIFW ASTRHAGVPD RFTGSGSGTD FTLTISSVQA GDLALYYCQQ HYSTPYTFGG GTKLEIKGGG SGGGGEVQLV ESGGGLVQPG GSLRLSCAAS GFTFSTYAMN WVRQAPGKGL EWVGRIRSKY NNYATYYADS VKGRFTISRD DSKNSLYLQM NSLKTEDTAV YYCVRHGNFG NSYVSWFAYW GQGTLVTVSS GGCGGGEVAA LEKEVAALEK EVAALEKEVA ALEKGGGDKT HTCPPCPAPE AAGGPSVFLF PPKPKDTLMI SRIPEVICVV VDVSHEDPEV KFNWYVDGVE VHNAKTKPRE EQYNSTYRVV SVLTVLHQDW LNGKEYKCKV SNKALPAPIE KTISKAKGQP REPQVYTLPP SREEMTKNQV SLWCLVKGFY PSDIAVEWES NGQPENNYKT TPPVLDSDGS FFLYSKLTVD KSRWQQGNVF SCSVMHEALH NHYTQKSLSL SPGK

(492) In SEQ ID NO:244, amino acid residues 1-107 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 3 (SEQ ID NO:172), residues 108-115 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 116-240 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 241-246 correspond to the GGCGGG linker (SEQ ID NO:34), residues 247-274 correspond to an E-coil Domain (SEQ ID NO:39), residues 275-277 are the linker GGG, residues 278-287 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 288-504 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(493) A polynucleotide that encodes SEQ ID NO:244 is (SEQ ID NO:245):

(494) TABLE-US-00155 gacattgtgc tgacccagtc tcacagatcc atgtccacat cagtaggaga cagggtcaac atcacctgca aggccagtca ggatgtgact actgctgtag cctggtatca acaaaaacca gggcaatctc ctaaattact gattttctgg gcatccaccc ggcacgctgg agtccctgat cgcttcacag gcagtggatc tgggacagat tttactctca ccatcagcag tgtgcaggct ggagacctgg cactttatta ctgtcaacaa cattatagca caccgtacac attcggaggg gggaccaagc tggaaataaa aggtggagga tccggcggcg gaggcgaggt gcagctggtg gagtctgggg gaggcttggt ccagcctgga gggtccctga gactctcctg tgcagcctct ggattcacct tcagcacata cgctatgaat tgggtccgcc aggctccagg gaaggggctg gagtgggttg gaaggatcag gtccaagtac aacaattatg caacctacta tgccgactct gtgaagggta gattcaccat ctcaagagat gattcaaaga actcactgta tctgcaaatg aacagcctga aaaccgagga cacggccgtg tattactgtg tgagacacgg taacttcggc aattcttacg tgtcttggtt tgcttattgg ggacagggga cactggtgac tgtgtcttcc ggaggatgtg gcggtggaga agtggccgca ctggagaaag aggttgctgc tttggagaag gaggtcgctg cacttgaaaa ggaggtcgca gccctggaga aaggcggcgg ggacaaaact cacacatgcc caccgtgccc agcacctgaa gccgcggggg gaccgtcagt cttcctcttc cccccaaaac ccaaggacac cctcatgatc tcccggaccc ctgaggtcac atgcgtggtg gtggacgtga gccacgaaga ccctgaggtc aagttcaact ggtacgtgga cggcgtggag gtgcataatg ccaagacaaa gccgcgggag gagcagtaca acagcacgta ccgtgtggtc agcgtcctca ccgtcctgca ccaggactgg ctgaatggca aggagtacaa gtgcaaggtc tccaacaaag ccctcccagc ccccatcgag aaaaccatct ccaaagccaa agggcagccc cgagaaccac aggtgtacac cctgccccca tcccgggagg agatgaccaa gaaccaggtc agcctgtggt gcctggtcaa aggcttctat cccagcgaca tcgccgtgga gtgggagagc aatgggcagc cggagaacaa ctacaagacc acgcctcccg tgctggactc cgacggctcc ttcttcctct acagcaagct caccgtggac aagagcaggt ggcagcaggg gaacgtcttc tcatgctccg tgatgcatga ggctctgcac aaccactaca cgcagaagag cctctccctg tctccgggta aa

(495) The amino acid sequence of the second polypeptide chain of EphA2 mAb 3×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:246):

(496) TABLE-US-00156 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGINKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGEV QLVESGGGSV KPGGSLKLSC AASGFTFTDH YMYWVRQTPE KRLEWVATIS DGGSFTSYPD SVKGRFTISR DIAKNNLYLQ MSSLKSEDTA MYYCTRDESD RPFPYWGQGT LVTVSSGGCG GGKVAALKEK VAALKEKVAA LKEKVAALKE

(497) In SEQ ID NO:246, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-236 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 3 (SEQ ID NO:177), residues 237-242 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 243-270 are a K-coil Domain (SEQ ID NO:40).

(498) A polynucleotide that encodes SEQ ID NO:246 is (SEQ ID NO:247):

(499) TABLE-US-00157 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggagaagtg cagctggtgg agtctggggg aggctcagtg aagcctggag ggtccctgaa actctcctgt gcagcctctg gattcacttt cactgaccat tacatgtatt gggttcgcca gactccggaa aagaggctgg agtgggtcgc aaccattagt gatggcggta gtttcacctc ctatccagac agtgtgaagg ggcgattcac catctccaga gacattgcca agaacaacct gtacctccaa atgagcagtc tgaagtctga ggacacagcc atgtattact gtacaagaga tgagagcgat aggccgtttc cttactgggg ccaagggact ctggtcactg tctcctccgg aggatgtggc ggtggaaaag tggccgcact gaaggagaaa gttgctgctt tgaaagagaa ggtcgccgca cttaaggaaa aggtcgcagc cctgaaagag

(500) The amino acid sequence of the third polypeptide chain of EphA2 mAb 3×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:248):

(501) TABLE-US-00158 EVKFLESGGG LVQPGGSLKL SCVASGFDFS RYWMSWVRQA PGKGLEWIGE INPDSNTINY TPSLKDKFII SRDNAKNTLY LQMTKVRSED TALYYCTRRA YYGNPAWFAY WGQGTLVTVS SASTKGPSVF PLAPSSKSTS GGTAALGCLV KDYFPEPVTV SWNSGALTSG VHTFPAVLQS SGLYSLSSVV TVPSSSLGTQ TYICNVNHKP SNTKVDKRVE PKSCDKTHTC PPCPAPEAAG GPSVFLFPPK PKDTLMISRT PEVTCVVVDV SHEDPEVKFN WYVDGVEVHN AKTKPREEQY NSTYRVVSVL TVLHQDWLNG KEYKCKVSNK ALPAPIEKTI SKAKGQPREP QVYTLPPSRE EMTKNQVSLS CAVKGFYPSD IAVEWESNGQ PENNYKTTPP VLDSDGSFFL VSKLTVDKSR WQQGNVFSCS VMHEALHNRY TQKSLSLSPG K

(502) In SEQ ID NO:248, amino acid residues 1-121 correspond to the amino acid sequence of the VH Domain of DR5 mAb 1 (SEQ ID NO:8), residues 122-219 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 220-234 correspond to a linker (SEQ ID NO:209), and residues 235-451 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(503) A polynucleotide that encodes SEQ ID NO:248 is (SEQ ID NO:249):

(504) TABLE-US-00159 gaggtgaagt ttctcgagtc tggaggtggc ctggtgcagc ctggaggatc cctgaaactc tcctgtgtag cctcaggatt cgattttagt agatactgga tgagttgggt ccggcaggct ccagggaaag ggctagaatg gattggagaa attaatccag atagcaatac gataaactat acgccatctc taaaggataa attcatcatc tccagagaca acgccaaaaa tacgctgtat ctgcaaatga ccaaagtgag atctgaggac acagcccttt attattgtac aagaagggcc tactatggta acccggcctg gtttgcttac tggggccaag ggactctggt cactgtctct tccgcctcca ccaagggccc atcggtcttc cccctggcac cctcctccaa gagcacctct gggggcacag cggccctggg ctgcctggtc aaggactact tccccgaacc ggtgacggtg tcgtggaact caggcgccct gaccagcggc gtgcacacct tcccggctgt cctacagtcc tcaggactct actccctcag cagcgtggtg accgtgccct ccagcagctt gggcacccag acctacatct gcaacgtgaa tcacaagccc agcaacacca aggtggacaa gagagttgag cccaaatctt gtgacaaaac tcacacatgc ccaccgtgcc cagcacctga agccgcgggg ggaccgtcag tcttcctctt ccccccaaaa cccaaggaca ccctcatgat ctcccggacc cctgaggtca catgcgtggt ggtggacgtg agccacgaag accctgaggt caagttcaac tggtacgtgg acggcgtgga ggtgcataat gccaagacaa agccgcggga ggagcagtac aacagcacgt accgtgtggt cagcgtcctc accgtcctgc accaggactg gctgaatggc aaggagtaca agtgcaaggt ctccaacaaa gccctcccag cccccatcga gaaaaccatc tccaaagcca aagggcagcc ccgagaacca caggtgtaca ccctgccccc atcccgggag gagatgacca agaaccaggt cagcctgagt tgcgcagtca aaggcttcta tcccagcgac atcgccgtgg agtgggagag caatgggcag ccggagaaca actacaagac cacgcctccc gtgctggact ccgacggctc cttcttcctc gtcagcaagc tcaccgtgga caagagcagg tggcagcagg ggaacgtctt ctcatgctcc gtgatgcatg aggctctgca caaccgctac acgcagaaga gcctctccct gtctccgggt aaa

(505) The amino acid sequence of the fourth polypeptide chain of EphA2 mAb 3×CD3 mAb 2×DR5 mAb 1 is (SEQ ID NO:250):

(506) TABLE-US-00160 DIVLTQSPAS LAVSLGQRAT ISCRASKSVS SSGYSYMHWY QQKPGQPPKV LIFLSSNLDS GVPARFSGSG SGTDFTLNIH PVEDGDAATY YCQHSRDLPP TFGGGTKLEI KRTVAAPSVF IFPPSDEQLK SGTASVVCLL NNFYPREAKV QWKVDNALQS GNSQESVTEQ DSKDSTYSLS STLTLSKADY EKHKVYACEV THQGLSSPVT KSFNRGEC

(507) In SEQ ID NO:250, amino acid residues 1-111 correspond to the amino acid sequence of the VL Domain of DR5 mAb 1 (SEQ ID NO:3), and residues 112-218 correspond to the CL Kappa Domain (SEQ ID NO:210).

(508) A polynucleotide that encodes SEQ ID NO:250 is (SEQ ID NO:251):

(509) TABLE-US-00161 gacattgtgc tgacacagtc tcctgcttcc ttagctgtat ctctcgggca gagggccacc atctcatgca gggccagcaa aagtgtcagt tcctctggct atagttatat gcactggtac caacagaaac caggacagcc acccaaagtc ctcatctttc tttcatccaa cctagattct ggggtccctg ccaggttcag tggcagtggg tctgggacag acttcaccct caacatccat cctgtggagg atggggatgc tgcaacctat tactgtcagc acagtaggga tcttcctccg acgttcggtg gaggcaccaa gctggaaatc aaacgtacgg tggctgcacc atcggtcttc atcttcccgc catctgatga gcagttgaaa tctggaactg cctctgttgt gtgcctgctg aataacttct atcccagaga ggccaaagta cagtggaagg tggataacgc cctccaatcg ggtaactccc aggagagtgt cacagagcag gacagcaagg acagcaccta cagcctcagc agcaccctga cgctgagcaa agcagactac gagaaacaca aagtctacgc ctgcgaagtc acccatcagg gcctgagctc gcccgtcaca aagagcttca acaggggaga gtgt

(510) Although the exemplary Tri-Specific Binding Molecules described above comprise three Light Chain (VL) CDRs and three Heavy Chain (VH) CDRs for each binding domain, it will be recognized that the invention also includes Tri-Specific Binding Molecules that possess: (1) at least one of the CDRs of the VL Domain of any such binding domain; (2) at least two of the CDRs of the VL Domain of any such binding domain; (3) the three CDRs of the VL Domain of any such binding domain; (4) at least one of the CDRs of the VH Domain of any such binding domain; (5) at least two of the CDRs of the VH Domain of any such binding domain; (6) the three CDRs of the VH Domain of any such binding domain; (7) at least one of the CDRs of the VL Domain of any such binding domain and at least one of the CDRs of the VH Domain of that binding domain; (8) at least two of the CDRs of the VL Domain of any such binding domain and at least two of the CDRs of the VH Domain of that binding domain; (9) the three CDRs of the VL Domain of any such binding domain and the three CDRs of the VH Domain of that binding domain; (10) the VL Domain of any such binding domain; (11) the VH Domain of any such binding domain; or (12) the VL and VH Domains of any such binding domain.

K. gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 1

(511) A Tri-Specific Binding Molecule composed of four polypeptide chains was constructed that comprises the VL and VH domains of gpA33 mAb 1, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of EphA2 mAb 1. The Tri-Specific Binding Molecule was accordingly designated “gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 1.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:252):

(512) TABLE-US-00162 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSTYAMNW VRQAPGKGLE WVGRIRSKYN NYATYYADSV KGRFTISRDD SKNSLYLQMN SLKTEDTAVY YCVRHGNFGN SYVSWFAYWG QGTLVTVSSG GCGGGEVAAL EKEVAALEKE VAALEKEVAA LEKGGGDKTH TCPPCPAPEA AGGPSVFLFP PKPKDTLMIS RTPEVTCVVV DVSHEDPEVK FNWYVDGVEV HNAKTKPREE QYNSTYRVVS VLTVLHQDWL NGKEYKCKVS NKALPAPIEK TISKAKGQPR EPQVYTLPPS REEMTKNQVS LWCLVKGFYP SDIAVEWESN GQPENNYKTT PPVLDSDGSF FLYSKLTVDK SRWQQGNVFS CSVMHEALHN HYTQKSLSLS PGK

(513) In SEQ ID NO:252, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), residues 107-114 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 115-239 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 240-245 correspond to the GGCGGG linker (SEQ ID NO:34), residues 246-273 correspond to an E-coil Domain (SEQ ID NO:39), residues 274-276 are the linker GGG, residues 277-286 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 287-503 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(514) A polynucleotide that encodes SEQ ID NO:252 is (SEQ ID NO:253):

(515) TABLE-US-00163 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaaggg tggaggatcc ggcggcggag gcgaggtgca gctggtggag tctgggggag gcttggtcca gcctggaggg tccctgagac tctcctgtgc agcctctgga ttcaccttca gcacatacgc tatgaattgg gtccgccagg ctccagggaa ggggctggag tgggttggaa ggatcaggtc caagtacaac aattatgcaa cctactatgc cgactctgtg aagggtagat tcaccatctc aagagatgat tcaaagaact cactgtatct gcaaatgaac agcctgaaaa ccgaggacac ggccgtgtat tactgtgtga gacacggtaa cttcggcaat tcttacgtgt cttggtttgc ttattgggga caggggacac tggtgactgt gtcttccgga ggatgtggcg gtggagaagt ggccgcactg gagaaagagg ttgctgcttt ggagaaggag gtcgctgcac ttgaaaagga ggtcgcagcc ctggagaaag gcggcgggga caaaactcac acatgcccac cgtgcccagc acctgaagcc gcggggggac cgtcagtctt cctcttcccc ccaaaaccca aggacaccct catgatctcc cggacccctg aggtcacatg cgtggtggtg gacgtgagcc acgaagaccc tgaggtcaag ttcaactggt acgtggacgg cgtggaggtg cataatgcca agacaaagcc gcgggaggag cagtacaaca gcacgtaccg tgtggtcagc gtcctcaccg tcctgcacca ggactggctg aatggcaagg agtacaagtg caaggtctcc aacaaagccc tcccagcccc catcgagaaa accatctcca aagccaaagg gcagccccga gaaccacagg tgtacaccct gcccccatcc cgggaggaga tgaccaagaa ccaggtcagc ctgtggtgcc tggtcaaagg cttctatccc agcgacatcg ccgtggagtg ggagagcaat gggcagccgg agaacaacta caagaccacg cctcccgtgc tggactccga cggctccttc ttcctctaca gcaagctcac cgtggacaag agcaggtggc agcaggggaa cgtcttctca tgctccgtga tgcatgaggc tctgcacaac cactacacgc agaagagcct ctccctgtct ccgggtaaa

(516) The amino acid sequence of the second polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 1 is (SEQ ID NO:254):

(517) TABLE-US-00164 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLVQSGAEVK KPGASVKVSC KASGYTFTGS WMNWVRQAPG QGLEWIGRIY PGDGETNYNG KFKDRVTITA DKSTSTAYME LSSLRSEDTA VYYCARIYGN NVYFDVWGQG TTVTVSSGGC GGGKVAALKE KVAALKEKVA ALKEKVAALK E

(518) In SEQ ID NO:254, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-237 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 238-243 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 244-271 are a K-coil Domain (SEQ ID NO:40).

(519) A polynucleotide that encodes SEQ ID NO:254 is (SEQ ID NO:255):

(520) TABLE-US-00165 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacaggtc cagctggtcc agagcggggc cgaagtcaaa aaacccggag caagcgtgaa ggtctcctgc aaagcatcag gctatacatt tacaggcagc tggatgaact gggtgaggca ggctccagga cagggactgg agtggatcgg gcgcatctac cctggagacg gcgaaactaa ctataatgga aagttcaaag accgagtgac catcacagcc gataagtcta ctagtaccgc ctacatggag ctgagctccc tgcggtctga agataccgcc gtctactatt gcgctagaat ttacggaaac aatgtctatt ttgacgtgtg ggggcaggga acaactgtga ctgtctcctc cggaggatgt ggcggtggaa aagtggccgc actgaaggag aaagttgctg ctttgaaaga gaaggtcgcc gcacttaagg aaaaggtcgc agccctgaaa gag

(521) The amino acid sequence of the third polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 1 is (SEQ ID NO:256):

(522) TABLE-US-00166 QVQLKESGPG LVAPSQSLSI TCTVSGFSLS RYSVHWVRQP PGKGLEWLGM IWGGGSTDYN SALKSRLSIS KDNSKSQVFL KMNSLQTDDT AMYYCARKHG NYYTMDYWGQ GTSVTVSSAS TKGPSVFPLA PSSKSTSGGT AALGCLVKDY FPEPVTVSWN SGALTSGVHT FPAVLQSSGL YSLSSVVTVP SSSLGTQTYI CNVNHKPSNT KVDKRVEPKS CDKTHTCPPC PAPEAAGGPS VFLFPPKPKD TLMISRTPEV TCVVVDVSHE DPEVKFNWYV DGVEVHNAKT KPREEQYNST YRVVSVLTVL HQDWLNGKEY KCKVSNKALP APIEKTISKA KGQPREPQVY TLPPSREEMT KNQVSLSCAV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLVSK LTVDKSRWQQ GNVFSCSVMH EALHNRYTQK SLSLSPGK

(523) In SEQ ID NO:256, amino acid residues 1-118 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 1 (SEQ ID NO:158), residues 119-216 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 217-231 correspond to a linker (SEQ ID NO:209), and residues 232-448 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(524) A polynucleotide that encodes SEQ ID NO:256 is (SEQ ID NO:257):

(525) TABLE-US-00167 caggtgcagc tgaaggagtc aggacctggc ctggtggcac cctcacagag cctgtccatc acatgcactg tctctgggtt ctcattatcc agatatagtg tacactgggt tcgccagcct ccaggaaagg gtctggagtg gctgggaatg atatggggtg gtggaagcac agactataat tcagctctca aatccagact gagtatcagc aaggacaact ccaagagcca agttttctta aaaatgaaca gtctgcaaac tgatgacaca gccatgtact actgtgccag aaaacatggt aactactata ctatggacta ctggggtcaa ggaacctcag tcaccgtctc ctccgcctcc accaagggcc catcggtctt ccccctggca ccctcctcca agagcacctc tgggggcaca gcggccctgg gctgcctggt caaggactac ttccccgaac cggtgacggt gtcgtggaac tcaggcgccc tgaccagcgg cgtgcacacc ttcccggctg tcctacagtc ctcaggactc tactccctca gcagcgtggt gaccgtgccc tccagcagct tgggcaccca gacctacatc tgcaacgtga atcacaagcc cagcaacacc aaggtggaca agagagttga gcccaaatct tgtgacaaaa ctcacacatg cccaccgtgc ccagcacctg aagccgcggg gggaccgtca gtcttcctct tccccccaaa acccaaggac accctcatga tctcccggac ccctgaggtc acatgcgtgg tggtggacgt gagccacgaa gaccctgagg tcaagttcaa ctggtacgtg gacggcgtgg aggtgcataa tgccaagaca aagccgcggg aggagcagta caacagcacg taccgtgtgg tcagcgtcct caccgtcctg caccaggact ggctgaatgg caaggagtac aagtgcaagg tctccaacaa agccctccca gcccccatcg agaaaaccat ctccaaagcc aaagggcagc cccgagaacc acaggtgtac accctgcccc catcccggga ggagatgacc aagaaccagg tcagcctgag ttgcgcagtc aaaggcttct atcccagcga catcgccgtg gagtgggaga gcaatgggca gccggagaac aactacaaga ccacgcctcc cgtgctggac tccgacggct ccttcttcct cgtcagcaag ctcaccgtgg acaagagcag gtggcagcag gggaacgtct tctcatgctc cgtgatgcat gaggctctgc acaaccgcta cacgcagaag agcctctccc tgtctccggg taaa

(526) The amino acid sequence of the fourth polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 1 is (SEQ ID NO:258):

(527) TABLE-US-00168 DIQMTQTTSS LSASLGDRIT ISCRASQDIS NYLNWYQQKP DGTVKLLIYY TSRLHSGVPS RFSGSGSGTD YSLTISNLEQ EDIATYFCQQ GYTLYTFGGG TKLEIKRTVA APSVFIFPPS DEQLKSGTAS VVCLLNNFYP REAKVQWKVD NALQSGNSQE SVTEQDSKDS TYSLSSTLTL SKADYEKHKV YACEVTHQGL SSPVTKSFNR GEC

(528) In SEQ ID NO:258, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 1 (SEQ ID NO:153), and residues 107-213 correspond to the CL Kappa Domain (SEQ ID NO:210).

(529) A polynucleotide that encodes SEQ ID NO:258 is (SEQ ID NO:259):

(530) TABLE-US-00169 gatatccaga tgacacagac tacatcctcc ctgtctgcct ctctgggaga cagaatcacc atcagttgca gggcaagtca ggacattagc aattatttaa actggtatca gcagaaacca gatggaactg ttaaactcct gatctactac acatcaagat tacactcagg agtcccatca aggttcagtg gcagtgggtc tggaacagat tattctctca ccattagcaa cctggagcaa gaagatattg ccacttactt ttgccaacag ggttatacgc tgtacacgtt cggagggggg accaagctgg aaataaaacg tacggtggct gcaccatcgg tcttcatctt cccgccatct gatgagcagt tgaaatctgg aactgcctct gttgtgtgcc tgctgaataa cttctatccc agagaggcca aagtacagtg gaaggtggat aacgccctcc aatcgggtaa ctcccaggag agtgtcacag agcaggacag caaggacagc acctacagcc tcagcagcac cctgacgctg agcaaagcag actacgagaa acacaaagtc tacgcctgcg aagtcaccca tcagggcctg agctcgcccg tcacaaagag cttcaacagg ggagagtgt

L. gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 2

(531) A Tri-Specific Binding Molecule composed of four polypeptide chains was constructed that comprises the VL and VH domains of gpA33 mAb 1, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of EphA2 mAb 2. The Tri-Specific Binding Molecule was accordingly designated “gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 2.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:260):

(532) TABLE-US-00170 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSTYAMNW VRQAPGKGLE WVGRIRSKYN NYATYYADSV KGRFTISRDD SKNSLYLQMN SLKTEDTAVY YCVRHGNFGN SYVSWFAYWG QGTLVTVSSG GCGGGEVAAL EKEVAALEKE VAALEKEVAA LEKGGGDKTH TCPPCPAPEA AGGPSVFLFP PKPKDTLMIS RTPEVTCVVV DVSHEDPEVK FNWYVDGVEV HNAKTKPREE QYNSTYRVVS VLTVLHQDWL NGKEYKCKVS NKALPAPIEK TISKAKGQPR EPQVYTLPPS REEMTKNQVS LWCLVKGFYP SDIAVEWESN GQPENNYKTT PPVLDSDGSF FLYSKLTVDK SRWQQGNVFS CSVMHEALHN HYTQKSLSLS PGK

(533) In SEQ ID NO:260, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), residues 107-114 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 115-239 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 240-245 correspond to the GGCGGG linker (SEQ ID NO:34), residues 246-273 correspond to an E-coil Domain (SEQ ID NO:39), residues 274-276 are the linker GGG, residues 277-286 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 287-503 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(534) A polynucleotide that encodes SEQ ID NO:260 is (SEQ ID NO:261):

(535) TABLE-US-00171 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaaggg tggaggatcc ggcggcggag gcgaggtgca gctggtggag tctgggggag gcttggtcca gcctggaggg tccctgagac tctcctgtgc agcctctgga ttcaccttca gcacatacgc tatgaattgg gtccgccagg ctccagggaa ggggctggag tgggttggaa ggatcaggtc caagtacaac aattatgcaa cctactatgc cgactctgtg aagggtagat tcaccatctc aagagatgat tcaaagaact cactgtatct gcaaatgaac agcctgaaaa ccgaggacac ggccgtgtat tactgtgtga gacacggtaa cttcggcaat tcttacgtgt cttggtttgc ttattgggga caggggacac tggtgactgt gtcttccgga ggatgtggcg gtggagaagt ggccgcactg gagaaagagg ttgctgcttt ggagaaggag gtcgctgcac ttgaaaagga ggtcgcagcc ctggagaaag gcggcgggga caaaactcac acatgcccac cgtgcccagc acctgaagcc gcggggggac cgtcagtctt cctcttcccc ccaaaaccca aggacaccct catgatctcc cggacccctg aggtcacatg cgtggtggtg gacgtgagcc acgaagaccc tgaggtcaag ttcaactggt acgtggacgg cgtggaggtg cataatgcca agacaaagcc gcgggaggag cagtacaaca gcacgtaccg tgtggtcagc gtcctcaccg tcctgcacca ggactggctg aatggcaagg agtacaagtg caaggtctcc aacaaagccc tcccagcccc catcgagaaa accatctcca aagccaaagg gcagccccga gaaccacagg tgtacaccct gcccccatcc cgggaggaga tgaccaagaa ccaggtcagc ctgtggtgcc tggtcaaagg cttctatccc agcgacatcg ccgtggagtg ggagagcaat gggcagccgg agaacaacta caagaccacg cctcccgtgc tggactccga cggctccttc ttcctctaca gcaagctcac cgtggacaag agcaggtggc agcaggggaa cgtcttctca tgctccgtga tgcatgaggc tctgcacaac cactacacgc agaagagcct ctccctgtct ccgggtaaa

(536) The amino acid sequence of the second polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 2 is (SEQ ID NO:262):

(537) TABLE-US-00172 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLVQSGAEVK KPGASVKVSC KASGYTFTGS WMNWVRQAPG QGLEWIGRIY PGDGETNYNG KFKDRVTITA DKSTSTAYME LSSLRSEDTA VYYCARIYGN NVYFDVWGQG TTVTVSSGGC GGGKVAALKE KVAALKEKVA ALKEKVAALK E

(538) In SEQ ID NO:262, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-237 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 238-243 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 244-271 are a K-coil Domain (SEQ ID NO:40).

(539) A polynucleotide that encodes SEQ ID NO:262 is (SEQ ID NO:263):

(540) TABLE-US-00173 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacaggtc cagctggtcc agagcggggc cgaagtcaaa aaacccggag caagcgtgaa ggtctcctgc aaagcatcag gctatacatt tacaggcagc tggatgaact gggtgaggca ggctccagga cagggactgg agtggatcgg gcgcatctac cctggagacg gcgaaactaa ctataatgga aagttcaaag accgagtgac catcacagcc gataagtcta ctagtaccgc ctacatggag ctgagctccc tgcggtctga agataccgcc gtctactatt gcgctagaat ttacggaaac aatgtctatt ttgacgtgtg ggggcaggga acaactgtga ctgtctcctc cggaggatgt ggcggtggaa aagtggccgc actgaaggag aaagttgctg ctttgaaaga gaaggtcgcc gcacttaagg aaaaggtcgc agccctgaaa gag

(541) The amino acid sequence of the third polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 2 is (SEQ ID NO:264):

(542) TABLE-US-00174 QIQLVQSGPE LKKPGETVKI SCKASGFTFT NYGMNWVKQA PGKGLKWMGW INTYIGEPTY ADDFKGRFVF SLETSASTAY LQINNLKNED MATYFCAREL GPYYFDYWGQ GTTLTVSSAS TKGPSVFPLA PSSKSTSGGT AALGCLVKDY FPEPVTVSWN SGALTSGVHT FPAVLQSSGL YSLSSVVTVP SSSLGTQTYI CNVNHKPSNT KVDKRVEPKS CDKTHTCPPC PAPEAAGGPS VFLFPPKPKD TLMISRTPEV TCVVVDVSHE DPEVKFNWYV DGVEVHNAKT KPREEQYNST YRVVSVLTVL HQDWLNGKEY KCKVSNKALP APIEKTISKA KGQPREPQVY TLPPSREEMT KNQVSLSCAV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLVSK LTVDKSRWQQ GNVFSCSVMH EALHNRYTQK SLSLSPGK

(543) In SEQ ID NO:264, amino acid residues 1-118 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 2 (SEQ ID NO:167), residues 119-216 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 217-231 correspond to a linker (SEQ ID NO:209), and residues 232-448 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(544) A polynucleotide that encodes SEQ ID NO:264 is (SEQ ID NO:265):

(545) TABLE-US-00175 cagatccagt tggtgcagtc tggacctgag ctgaagaagc ctggagagac agtcaagatc tcctgcaagg cttctgggtt taccttcaca aactatggaa tgaactgggt gaagcaggct ccaggaaagg gtttaaagtg gatgggctgg ataaacacct atattggaga gccgacatat gctgatgact tcaagggacg gtttgtcttc tctttggaaa cctctgccag cactgcctat ttgcagatca acaacctcaa aaatgaggac atggccacat atttctgtgc aagagaactg ggaccatact actttgacta ctggggccaa ggcaccactc tcacagtctc ctccgcctcc accaagggcc catcggtctt ccccctggca ccctcctcca agagcacctc tgggggcaca gcggccctgg gctgcctggt caaggactac ttccccgaac cggtgacggt gtcgtggaac tcaggcgccc tgaccagcgg cgtgcacacc ttcccggctg tcctacagtc ctcaggactc tactccctca gcagcgtggt gaccgtgccc tccagcagct tgggcaccca gacctacatc tgcaacgtga atcacaagcc cagcaacacc aaggtggaca agagagttga gcccaaatct tgtgacaaaa ctcacacatg cccaccgtgc ccagcacctg aagccgcggg gggaccgtca gtcttcctct tccccccaaa acccaaggac accctcatga tctcccggac ccctgaggtc acatgcgtgg tggtggacgt gagccacgaa gaccctgagg tcaagttcaa ctggtacgtg gacggcgtgg aggtgcataa tgccaagaca aagccgcggg aggagcagta caacagcacg taccgtgtgg tcagcgtcct caccgtcctg caccaggact ggctgaatgg caaggagtac aagtgcaagg tctccaacaa agccctccca gcccccatcg agaaaaccat ctccaaagcc aaagggcagc cccgagaacc acaggtgtac accctgcccc catcccggga ggagatgacc aagaaccagg tcagcctgag ttgcgcagtc aaaggcttct atcccagcga catcgccgtg gagtgggaga gcaatgggca gccggagaac aactacaaga ccacgcctcc cgtgctggac tccgacggct ccttcttcct cgtcagcaag ctcaccgtgg acaagagcag gtggcagcag gggaacgtct tctcatgctc cgtgatgcat gaggctctgc acaaccgcta cacgcagaag agcctctccc tgtctccggg taaa

(546) The amino acid sequence of the fourth polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 2 is (SEQ ID NO:266):

(547) TABLE-US-00176 DVVMTQTPLS LPVSLGDQAS ISCRSSQSLV HSSGNTYLHW YLQKPGQSPK LLIYKVSNRF SGVPDRFSGS GSGTDFTLKI SRVEAEDLGV YFCSQSTHVP TFGSGTKLEI KRTVAAPSVF IFPPSDEQLK SGTASVVCLL NNFYPREAKV QWKVDNALQS GNSQESVTEQ DSKDSTYSLS STLTLSKADY EKHKVYACEV THQGLSSPVT KSFNRGEC

(548) In SEQ ID NO:266, amino acid residues 1-111 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 1 (SEQ ID NO:163), and residues 112-218 correspond to the CL Kappa Domain (SEQ ID NO:210).

(549) A polynucleotide that encodes SEQ ID NO:266 is (SEQ ID NO:267):

(550) TABLE-US-00177 gatgttgtga tgacccaaac tccactctcc ctgcctgtca gtcttggaga tcaagcctcc atctcttgca gatctagtca gagccttgta cacagtagtg gaaacaccta tttacattgg tacctgcaga agccaggcca gtctccaaag ctcctgatct acaaagtttc caaccgattt tctggggtcc cagacaggtt cagtggcagt ggatcaggga cagatttcac actcaagatc agcagagtgg aggctgagga tctgggagtt tatttctgct ctcaaagtac acatgttccc acgttcggct cggggacaaa gttggaaata aaacgtacgg tggctgcacc atcggtcttc atcttcccgc catctgatga gcagttgaaa tctggaactg cctctgttgt gtgcctgctg aataacttct atcccagaga ggccaaagta cagtggaagg tggataacgc cctccaatcg ggtaactccc aggagagtgt cacagagcag gacagcaagg acagcaccta cagcctcagc agcaccctga cgctgagcaa agcagactac gagaaacaca aagtctacgc ctgcgaagtc acccatcagg gcctgagctc gcccgtcaca aagagcttca acaggggaga gtgt

M. gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 3

(551) A Tri-Specific Binding Molecule composed of four polypeptide chains was constructed that comprises the VL and VH domains of gpA33 mAb 1, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of EphA2 mAb 3. The Tri-Specific Binding Molecule was accordingly designated “gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 3.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:268):

(552) TABLE-US-00178 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSTYAMNW VRQAPGKGLE WVGRIRSKYN NYATYYADSV KGRFTISRDD SKNSLYLQMN SLKTEDTAVY YCVRHGNFGN SYVSWFAYWG QGTLVTVSSG GCGGGEVAAL EKEVAALEKE VAALEKEVAA LEKGGGDKTH TCPPCPAPEA AGGPSVFLFP PKPKDTLMIS RTPEVTCVVV DVSHEDPEVK FNWYVDGVEV HNAKTKPREE QYNSTYRVVS VLTVLHQDWL NGKEYKCKVS NKALPAPIEK TISKAKGQPR EPQVYTLPPS REEMTKNQVS LWCLVKGFYP SDIAVEWESN GQPENNYKTT PPVLDSDGSF FLYSKLTVDK SRWQQGNVFS CSVMHEALHN HYTQKSLSLS PGK

(553) In SEQ ID NO:268, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), residues 107-114 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 115-239 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 240-245 correspond to the GGCGGG linker (SEQ ID NO:34), residues 246-273 correspond to an E-coil Domain (SEQ ID NO:39), residues 274-276 are the linker GGG, residues 277-286 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 287-503 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(554) A polynucleotide that encodes SEQ ID NO:268 is (SEQ ID NO:269):

(555) TABLE-US-00179 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaaggg tggaggatcc ggcggcggag gcgaggtgca gctggtggag tctgggggag gcttggtcca gcctggaggg tccctgagac tctcctgtgc agcctctgga ttcaccttca gcacatacgc tatgaattgg gtccgccagg ctccagggaa ggggctggag tgggttggaa ggatcaggtc caagtacaac aattatgcaa cctactatgc cgactctgtg aagggtagat tcaccatctc aagagatgat tcaaagaact cactgtatct gcaaatgaac agcctgaaaa ccgaggacac ggccgtgtat tactgtgtga gacacggtaa cttcggcaat tcttacgtgt cttggtttgc ttattgggga caggggacac tggtgactgt gtcttccgga ggatgtggcg gtggagaagt ggccgcactg gagaaagagg ttgctgcttt ggagaaggag gtcgctgcac ttgaaaagga ggtcgcagcc ctggagaaag gcggcgggga caaaactcac acatgcccac cgtgcccagc acctgaagcc gcggggggac cgtcagtctt cctcttcccc ccaaaaccca aggacaccct catgatctcc cggacccctg aggtcacatg cgtggtggtg gacgtgagcc acgaagaccc tgaggtcaag ttcaactggt acgtggacgg cgtggaggtg cataatgcca agacaaagcc gcgggaggag cagtacaaca gcacgtaccg tgtggtcagc gtcctcaccg tcctgcacca ggactggctg aatggcaagg agtacaagtg caaggtctcc aacaaagccc tcccagcccc catcgagaaa accatctcca aagccaaagg gcagccccga gaaccacagg tgtacaccct gcccccatcc cgggaggaga tgaccaagaa ccaggtcagc ctgtggtgcc tggtcaaagg cttctatccc agcgacatcg ccgtggagtg ggagagcaat gggcagccgg agaacaacta caagaccacg cctcccgtgc tggactccga cggctccttc ttcctctaca gcaagctcac cgtggacaag agcaggtggc agcaggggaa cgtcttctca tgctccgtga tgcatgaggc tctgcacaac cactacacgc agaagagcct ctccctgtct ccgggtaaa

(556) The amino acid sequence of the second polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 3 is (SEQ ID NO:270):

(557) TABLE-US-00180 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLVQSGAEVK KPGASVKVSC KASGYTFTGS WMNWVRQAPG QGLEWIGRIY PGDGETNYNG KFKDRVTITA DKSTSTAYME LSSLRSEDTA VYYCARIYGN NVYFDVWGQG TTVTVSSGGC GGGKVAALKE KVAALKEKVA ALKEKVAALK E

(558) In SEQ ID NO:270, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-237 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 238-243 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 244-271 are a K-coil Domain (SEQ ID NO:40).

(559) A polynucleotide that encodes SEQ ID NO:270 is (SEQ ID NO:271):

(560) TABLE-US-00181 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacaggtc cagctggtcc agagcggggc cgaagtcaaa aaacccggag caagcgtgaa ggtctcctgc aaagcatcag gctatacatt tacaggcagc tggatgaact gggtgaggca ggctccagga cagggactgg agtggatcgg gcgcatctac cctggagacg gcgaaactaa ctataatgga aagttcaaag accgagtgac catcacagcc gataagtcta ctagtaccgc ctacatggag ctgagctccc tgcggtctga agataccgcc gtctactatt gcgctagaat ttacggaaac aatgtctatt ttgacgtgtg ggggcaggga acaactgtga ctgtctcctc cggaggatgt ggcggtggaa aagtggccgc actgaaggag aaagttgctg ctttgaaaga gaaggtcgcc gcacttaagg aaaaggtcgc agccctgaaa gag

(561) The amino acid sequence of the third polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 3 is (SEQ ID NO:272):

(562) TABLE-US-00182 EVQLVESGGG SVKPGGSLKL SCAASGFTFT DHYMYWVRQT PEKRLEWVAT ISDGGSFTSY PDSVKGRFTI SRDIAKNNLY LQMSSLKSED TAMYYCTRDE SDRPFPYWGQ GTLVTVSSAS TKGPSVFPLA PSSKSTSGGT AALGCLVKDY FPEPVTVSWN SGALTSGVHT FPAVLQSSGL YSLSSVVTVP SSSLGTQTYI CNVNHKPSNT KVDKRVEPKS CDKTHTCPPC PAPEAAGGPS VFLFPPKPKD TLMISRTPEV TCVVVDVSHE DPEVKFNWYV DGVEVHNAKT KPREEQYNST YRVVSVLTVL HQDWLNGKEY KCKVSNKALP APIEKTISKA KGQPREPQVY TLPPSREEMT KNQVSLSCAV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLVSK LTVDKSRWQQ GNVFSCSVMH EALHNRYTQK SLSLSPGK

(563) In SEQ ID NO:272, amino acid residues 1-118 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 3 (SEQ ID NO:177), residues 119-216 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 217-231 correspond to a linker (SEQ ID NO:209), and residues 232-448 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(564) A polynucleotide that encodes SEQ ID NO:272 is (SEQ ID NO:273):

(565) TABLE-US-00183 gaagtgcagc tggtggagtc tgggggaggc tcagtgaagc ctggagggtc cctgaaactc tcctgtgcag cctctggatt cactttcact gaccattaca tgtattgggt tcgccagact ccggaaaaga ggctggagtg ggtcgcaacc attagtgatg gcggtagttt cacctcctat ccagacagtg tgaaggggcg attcaccatc tccagagaca ttgccaagaa caacctgtac ctccaaatga gcagtctgaa gtctgaggac acagccatgt attactgtac aagagatgag agcgataggc cgtttcctta ctggggccaa gggactctgg tcactgtctc ctccgcctcc accaagggcc catcggtctt ccccctggca ccctcctcca agagcacctc tgggggcaca gcggccctgg gctgcctggt caaggactac ttccccgaac cggtgacggt gtcgtggaac tcaggcgccc tgaccagcgg cgtgcacacc ttcccggctg tcctacagtc ctcaggactc tactccctca gcagcgtggt gaccgtgccc tccagcagct tgggcaccca gacctacatc tgcaacgtga atcacaagcc cagcaacacc aaggtggaca agagagttga gcccaaatct tgtgacaaaa ctcacacatg cccaccgtgc ccagcacctg aagccgcggg gggaccgtca gtcttcctct tccccccaaa acccaaggac accctcatga tctcccggac ccctgaggtc acatgcgtgg tggtggacgt gagccacgaa gaccctgagg tcaagttcaa ctggtacgtg gacggcgtgg aggtgcataa tgccaagaca aagccgcggg aggagcagta caacagcacg taccgtgtgg tcagcgtcct caccgtcctg caccaggact ggctgaatgg caaggagtac aagtgcaagg tctccaacaa agccctccca gcccccatcg agaaaaccat ctccaaagcc aaagggcagc cccgagaacc acaggtgtac accctgcccc catcccggga ggagatgacc aagaaccagg tcagcctgag ttgcgcagtc aaaggcttct atcccagcga catcgccgtg gagtgggaga gcaatgggca gccggagaac aactacaaga ccacgcctcc cgtgctggac tccgacggct ccttcttcct cgtcagcaag ctcaccgtgg acaagagcag gtggcagcag gggaacgtct tctcatgctc cgtgatgcat gaggctctgc acaaccgcta cacgcagaag agcctctccc tgtctccggg taaa

(566) The amino acid sequence of the fourth polypeptide chain of gpA33 mAb 1×CD3 mAb 2×EphA2 mAb 3 is (SEQ ID NO:274):

(567) TABLE-US-00184 DIVLTQSHRS MSTSVGDRVN ITCKASQDVT TAVAWYQQKP GQSPKLLIFW ASTRHAGVPD RFTGSGSGTD FTLTISSVQA GDLALYYCQQ HYSTPYTFGG GTKLEIKRTV AAPSVFIFPP SDEQLKSGTA SVVCLLNNFY PREAKVQWKV DNALQSGNSQ ESVTEQDSKD STYSLSSTLT LSKADYEKHK VYACEVTHQG LSSPVTKSFN RGEC

(568) In SEQ ID NO:274, amino acid residues 1-107 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 3 (SEQ ID NO:172), and residues 108-214 correspond to the CL Kappa Domain (SEQ ID NO:210).

(569) A polynucleotide that encodes SEQ ID NO:274 is (SEQ ID NO:275):

(570) TABLE-US-00185 gacattgtgc tgacccagtc tcacagatcc atgtccacat cagtaggaga cagggtcaac atcacctgca aggccagtca ggatgtgact actgctgtag cctggtatca acaaaaacca gggcaatctc ctaaattact gattttctgg gcatccaccc ggcacgctgg agtccctgat cgcttcacag gcagtggatc tgggacagat tttactctca ccatcagcag tgtgcaggct ggagacctgg cactttatta ctgtcaacaa cattatagca caccgtacac attcggaggg gggaccaagc tggaaataaa acgtacggtg gctgcaccat cggtcttcat cttcccgcca tctgatgagc agttgaaatc tggaactgcc tctgttgtgt gcctgctgaa taacttctat cccagagagg ccaaagtaca gtggaaggtg gataacgccc tccaatcggg taactcccag gagagtgtca cagagcagga cagcaaggac agcacctaca gcctcagcag caccctgacg ctgagcaaag cagactacga gaaacacaaa gtctacgcct gcgaagtcac ccatcagggc ctgagctcgc ccgtcacaaa gagcttcaac aggggagagt gt

N. EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1

(571) An alternative EphA2/CD3/gpA33 Tri-Specific Binding Molecule was constructed. The molecule was composed of four polypeptide chains and comprises the VL and VH domains of EphA2 mAb 1, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of gpA33 mAb 1. The molecule was designated “EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:276):

(572) TABLE-US-00186 DIQMTQTTSS LSASLGDRIT ISCRASQDIS NYLNWYQQKP DGTVKLLIYY TSRLHSGVPS RFSGSGSGTD YSLTISNLEQ EDIATYFCQQ GYTLYTFGGG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSTYAMNW VRQAPGKGLE WVGRIRSKYN NYATYYADSV KGRFTISRDD SKNSLYLQMN SLKTEDTAVY YCVRHGNFGN SYVSWFAYWG QGTLVTVSSG GCGGGEVAAL EKEVAALEKE VAALEKEVAA LEKGGGDKTH TCPPCPAPEA AGGPSVFLFP PKPKDTLMIS RTPEVTCVVV DVSHEDPEVK FNWYVDGVEV HNAKTKPREE QYNSTYRVVS VLTVLHQDWL NGKEYKCKVS NKALPAPIEK TISKAKGQPR EPQVYTLPPS REEMTKNQVS LWCLVKGFYP SDIAVEWESN GQPENNYKTT PPVLDSDGSF FLYSKLTVDK SRWQQGNVFS CSVMHEALHN HYTQKSLSLS PGK

(573) In SEQ ID NO:276, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 1 (SEQ ID NO:153), residues 107-114 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 115-239 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 240-245 correspond to the GGCGGG linker (SEQ ID NO:34), residues 246-273 correspond to an E-coil Domain (SEQ ID NO:39), residues 274-276 are the linker GGG, residues 277-286 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 287-503 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(574) A polynucleotide that encodes SEQ ID NO:276 is (SEQ ID NO:277):

(575) TABLE-US-00187 gatatccaga tgacacagac tacatcctcc ctgtctgcct ctctgggaga cagaatcacc atcagttgca gggcaagtca ggacattagc aattatttaa actggtatca gcagaaacca gatggaactg ttaaactcct gatctactac acatcaagat tacactcagg agtcccatca aggttcagtg gcagtgggtc tggaacagat tattctctca ccattagcaa cctggagcaa gaagatattg ccacttactt ttgccaacag ggttatacgc tgtacacgtt cggagggggg accaagctgg aaataaaagg tggaggatcc ggcggcggag gcgaggtgca gctggtggag tctgggggag gcttggtcca gcctggaggg tccctgagac tctcctgtgc agcctctgga ttcaccttca gcacatacgc tatgaattgg gtccgccagg ctccagggaa ggggctggag tgggttggaa ggatcaggtc caagtacaac aattatgcaa cctactatgc cgactctgtg aagggtagat tcaccatctc aagagatgat tcaaagaact cactgtatct gcaaatgaac agcctgaaaa ccgaggacac ggccgtgtat tactgtgtga gacacggtaa cttcggcaat tcttacgtgt cttggtttgc ttattgggga caggggacac tggtgactgt gtcttccgga ggatgtggcg gtggagaagt ggccgcactg gagaaagagg ttgctgcttt ggagaaggag gtcgctgcac ttgaaaagga ggtcgcagcc ctggagaaag gcggcgggga caaaactcac acatgcccac cgtgcccagc acctgaagcc gcggggggac cgtcagtctt cctcttcccc ccaaaaccca aggacaccct catgatctcc cggacccctg aggtcacatg cgtggtggtg gacgtgagcc acgaagaccc tgaggtcaag ttcaactggt acgtggacgg cgtggaggtg cataatgcca agacaaagcc gcgggaggag cagtacaaca gcacgtaccg tgtggtcagc gtcctcaccg tcctgcacca ggactggctg aatggcaagg agtacaagtg caaggtctcc aacaaagccc tcccagcccc catcgagaaa accatctcca aagccaaagg gcagccccga gaaccacagg tgtacaccct gcccccatcc cgggaggaga tgaccaagaa ccaggtcagc ctgtggtgcc tggtcaaagg cttctatccc agcgacatcg ccgtggagtg ggagagcaat gggcagccgg agaacaacta caagaccacg cctcccgtgc tggactccga cggctccttc ttcctctaca gcaagctcac cgtggacaag agcaggtggc agcaggggaa cgtcttctca tgctccgtga tgcatgaggc tctgcacaac cactacacgc agaagagcct ctccctgtct ccgggtaaa

(576) The amino acid sequence of the second polypeptide chain of EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:278):

(577) TABLE-US-00188 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLKESGPGLV APSQSLSITC TVSGFSLSRY SVHWVRQPPG KGLEWLGMIW GGGSTDYNSA LKSRLSISKD NSKSQVFLKM NSLQTDDTAM YYCARKHGNY YTMDYWGQGT SVTVSSGGCG GGKVAALKEK VAALKEKVAA LKEKVAALKE

(578) In SEQ ID NO:278, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-236 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 1 (SEQ ID NO:158), residues 237-242 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 243-270 are a K-coil Domain (SEQ ID NO:40).

(579) A polynucleotide that encodes SEQ ID NO:278 is (SEQ ID NO:279):

(580) TABLE-US-00189 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacaggtg cagctgaagg agtcaggacc tggcctggtg gcaccctcac agagcctgtc catcacatgc actgtctctg ggttctcatt atccagatat agtgtacact gggttcgcca gcctccagga aagggtctgg agtggctggg aatgatatgg ggtggtggaa gcacagacta taattcagct ctcaaatcca gactgagtat cagcaaggac aactccaaga gccaagtttt cttaaaaatg aacagtctgc aaactgatga cacagccatg tactactgtg ccagaaaaca tggtaactac tatactatgg actactgggg tcaaggaacc tcagtcaccg tctcctccgg aggatgtggc ggtggaaaag tggccgcact gaaggagaaa gttgctgctt tgaaagagaa ggtcgccgca cttaaggaaa aggtcgcagc cctgaaagag

(581) The amino acid sequence of the third polypeptide chain of EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:280):

(582) TABLE-US-00190 QVQLVQSGAE VKKPGASVKV SCKASGYTFT GSWMNWVRQA PGQGLEWIGR IYPGDGETNY NGKFKDRVTI TADKSTSTAY MELSSLRSED TAVYYCARIY GNNVYFDVWG QGTTVTVSSA STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY ICNVNHKPSN TKVDKRVEPK SCDKTHTCPP CPAPEAAGGP SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLSCA VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLVS KLTVDKSRWQ QGNVFSCSVM HEALHNRYTQ KSLSLSPGK

(583) In SEQ ID NO:280, amino acid residues 1-119 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 120-217 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 218-232 correspond to a linker (SEQ ID NO:209), and residues 233-449 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(584) A polynucleotide that encodes SEQ ID NO:280 is (SEQ ID NO:281):

(585) TABLE-US-00191 caggtccagc tggtccagag cggggccgaa gtcaaaaaac ccggagcaag cgtgaaggtc tcctgcaaag catcaggcta tacatttaca ggcagctgga tgaactgggt gaggcaggct ccaggacagg gactggagtg gatcgggcgc atctaccctg gagacggcga aactaactat aatggaaagt tcaaagaccg agtgaccatc acagccgata agtctactag taccgcctac atggagctga gctccctgcg gtctgaagat accgccgtct actattgcgc tagaatttac ggaaacaatg tctattttga cgtgtggggg cagggaacaa ctgtgactgt ctcctccgcc tccaccaagg gcccatcggt cttccccctg gcaccctcct ccaagagcac ctctgggggc acagcggccc tgggctgcct ggtcaaggac tacttccccg aaccggtgac ggtgtcgtgg aactcaggcg ccctgaccag cggcgtgcac accttcccgg ctgtcctaca gtcctcagga ctctactccc tcagcagcgt ggtgaccgtg ccctccagca gcttgggcac ccagacctac atctgcaacg tgaatcacaa gcccagcaac accaaggtgg acaagagagt tgagcccaaa tcttgtgaca aaactcacac atgcccaccg tgcccagcac ctgaagccgc ggggggaccg tcagtcttcc tcttcccccc aaaacccaag gacaccctca tgatctcccg gacccctgag gtcacatgcg tggtggtgga cgtgagccac gaagaccctg aggtcaagtt caactggtac gtggacggcg tggaggtgca taatgccaag acaaagccgc gggaggagca gtacaacagc acgtaccgtg tggtcagcgt cctcaccgtc ctgcaccagg actggctgaa tggcaaggag tacaagtgca aggtctccaa caaagccctc ccagccccca tcgagaaaac catctccaaa gccaaagggc agccccgaga accacaggtg tacaccctgc ccccatcccg ggaggagatg accaagaacc aggtcagcct gagttgcgca gtcaaaggct tctatcccag cgacatcgcc gtggagtggg agagcaatgg gcagccggag aacaactaca agaccacgcc tcccgtgctg gactccgacg gctccttctt cctcgtcagc aagctcaccg tggacaagag caggtggcag caggggaacg tcttctcatg ctccgtgatg catgaggctc tgcacaaccg ctacacgcag aagagcctct ccctgtctcc gggtaaa

(586) The amino acid sequence of the fourth polypeptide chain of EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:282):

(587) TABLE-US-00192 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKRTVA APSVFIFPPS DEQLKSGTAS VVCLLNNFYP REAKVQWKVD NALQSGNSQE SVTEQDSKDS TYSLSSTLTL SKADYEKHKV YACEVTHQGL SSPVTKSFNR GEC

(588) In SEQ ID NO:282, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), and residues 107-213 correspond to the CL Kappa Domain (SEQ ID NO:210).

(589) A polynucleotide that encodes SEQ ID NO:282 is (SEQ ID NO:283):

(590) TABLE-US-00193 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaagcg tacggtggct gcaccatcgg tcttcatctt cccgccatct gatgagcagt tgaaatctgg aactgcctct gttgtgtgcc tgctgaataa cttctatccc agagaggcca aagtacagtg gaaggtggat aacgccctcc aatcgggtaa ctcccaggag agtgtcacag agcaggacag caaggacagc acctacagcc tcagcagcac cctgacgctg agcaaagcag actacgagaa acacaaagtc tacgcctgcg aagtcaccca tcagggcctg agctcgcccg tcacaaagag cttcaacagg ggagagtgt

O. EphA2 mAb 2×CD3 mAb 2×gpA33 mAb 1

(591) A second alternative EphA2/CD3/gpA33 Tri-Specific Binding Molecule was constructed. The molecule was composed of four polypeptide chains and comprises the VL and VH domains of EphA2 mAb 2, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of gpA33 mAb 1. The molecule was designated “EphA2 mAb 2×CD3 mAb 2×gpA33 mAb 1.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:284):

(592) TABLE-US-00194 DVVMTQTPLS LPVSLGDQAS ISCRSSQSLV HSSGNTYLHW YLQKPGQSPK LLIYKVSNRF SGVPDRFSGS GSGTDFTLKI SRVEAEDLGV YFCSQSTHVP TFGSGTKLEI KGGGSGGGGE VQLVESGGGL VQPGGSLRLS CAASGFTFST YAMNWVRQAP GKGLEWVGRI RSKYNNYATY YADSVKGRFT ISRDDSKNSL YLQMNSLKTE DTAVYYCVRH GNFGNSYVSW FAYWGQGTLV TVSSGGCGGG EVAALEKEVA ALEKEVAALE KEVAALEKGG GDKTHTCPPC PAPEAAGGPS VFLFPPKPKD TLMISRTPEV TCVVVDVSHE DPEVKFNWYV DGVEVHNAKT KPREEQYNST YRVVSVLTVL HQDWLNGKEY KCKVSNKALP APIEKTISKA KGQPREPQVY TLPPSREEMT KNQVSLWCLV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLYSK LTVDKSRWQQ GNVFSCSVMH EALHNHYTQK SLSLSPGK

(593) In SEQ ID NO:284, amino acid residues 1-111 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 2 (SEQ ID NO:163), residues 112-119 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 120-244 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 245-250 correspond to the GGCGGG linker (SEQ ID NO:34), residues 251-278 correspond to an E-coil Domain (SEQ ID NO:39), residues 279-281 are the linker GGG, residues 282-291 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 292-508 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(594) A polynucleotide that encodes SEQ ID NO:284 is (SEQ ID NO:285):

(595) TABLE-US-00195 gatgttgtga tgacccaaac tccactctcc ctgcctgtca gtcttggaga tcaagcctcc atctcttgca gatctagtca gagccttgta cacagtagtg gaaacaccta tttacattgg tacctgcaga agccaggcca gtctccaaag ctcctgatct acaaagtttc caaccgattt tctggggtcc cagacaggtt cagtggcagt ggatcaggga cagatttcac actcaagatc agcagagtgg aggctgagga tctgggagtt tatttctgct ctcaaagtac acatgttccc acgttcggct cggggacaaa gttggaaata aaaggtggag gatccggcgg cggaggcgag gtgcagctgg tggagtctgg gggaggcttg gtccagcctg gagggtccct gagactctcc tgtgcagcct ctggattcac cttcagcaca tacgctatga attgggtccg ccaggctcca gggaaggggc tggagtgggt tggaaggatc aggtccaagt acaacaatta tgcaacctac tatgccgact ctgtgaaggg tagattcacc atctcaagag atgattcaaa gaactcactg tatctgcaaa tgaacagcct gaaaaccgag gacacggccg tgtattactg tgtgagacac ggtaacttcg gcaattctta cgtgtcttgg tttgcttatt ggggacaggg gacactggtg actgtgtctt ccggaggatg tggcggtgga gaagtggccg cactggagaa agaggttgct gctttggaga aggaggtcgc tgcacttgaa aaggaggtcg cagccctgga gaaaggcggc ggggacaaaa ctcacacatg cccaccgtgc ccagcacctg aagccgcggg gggaccgtca gtcttcctct tccccccaaa acccaaggac accctcatga tctcccggac ccctgaggtc acatgcgtgg tggtggacgt gagccacgaa gaccctgagg tcaagttcaa ctggtacgtg gacggcgtgg aggtgcataa tgccaagaca aagccgcggg aggagcagta caacagcacg taccgtgtgg tcagcgtcct caccgtcctg caccaggact ggctgaatgg caaggagtac aagtgcaagg tctccaacaa agccctccca gcccccatcg agaaaaccat ctccaaagcc aaagggcagc cccgagaacc acaggtgtac accctgcccc catcccggga ggagatgacc aagaaccagg tcagcctgtg gtgcctggtc aaaggcttct atcccagcga catcgccgtg gagtgggaga gcaatgggca gccggagaac aactacaaga ccacgcctcc cgtgctggac tccgacggct ccttcttcct ctacagcaag ctcaccgtgg acaagagcag gtggcagcag gggaacgtct tctcatgctc cgtgatgcat gaggctctgc acaaccacta cacgcagaag agcctctccc tgtctccggg taaa

(596) The amino acid sequence of the second polypeptide chain of EphA2 mAb 2×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:286):

(597) TABLE-US-00196 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQI QLVQSGPELK KPGETVKISC KASGFTFTNY GMNWVKQAPG KGLKWMGWIN TYIGEPTYAD DFKGRFVFSL ETSASTAYLQ INNLKNEDMA TYFCARELGP YYFDYWGQGT TLTVSSGGCG GGKVAALKEK VAALKEKVAA LKEKVAALKE

(598) In SEQ ID NO:286, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-236 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 2 (SEQ ID NO:167), residues 237-242 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 243-270 are a K-coil Domain (SEQ ID NO:40).

(599) A polynucleotide that encodes SEQ ID NO:286 is (SEQ ID NO:287):

(600) TABLE-US-00197 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggacagatc cagttggtgc agtctggacc tgagctgaag aagcctggag agacagtcaa gatctcctgc aaggcttctg ggtttacctt cacaaactat ggaatgaact gggtgaagca ggctccagga aagggtttaa agtggatggg ctggataaac acctatattg gagagccgac atatgctgat gacttcaagg gacggtttgt cttctctttg gaaacctctg ccagcactgc ctatttgcag atcaacaacc tcaaaaatga ggacatggcc acatatttct gtgcaagaga actgggacca tactactttg actactgggg ccaaggcacc actctcacag tctcctccgg aggatgtggc ggtggaaaag tggccgcact gaaggagaaa gttgctgctt tgaaagagaa ggtcgccgca cttaaggaaa aggtcgcagc cctgaaagag

(601) The amino acid sequence of the third polypeptide chain of EphA2 mAb 2×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:288):

(602) TABLE-US-00198 QVQLVQSGAE VKKPGASVKV SCKASGYTFT GSWMNWVRQA PGQGLEWIGR IYPGDGETNY NGKFKDRVTI TADKSTSTAY MELSSLRSED TAVYYCARIY GNNVYFDVWG QGTTVTVSSA STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY ICNVNHKPSN TKVDKRVEPK SCDKTHTCPP CPAPEAAGGP SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLSCA VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLVS KLTVDKSRWQ QGNVFSCSVM HEALHNRYTQ KSLSLSPGK

(603) In SEQ ID NO:288, amino acid residues 1-119 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 120-217 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 218-232 correspond to a linker (SEQ ID NO:209), and residues 233-449 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(604) A polynucleotide that encodes SEQ ID NO:288 is (SEQ ID NO:289):

(605) TABLE-US-00199 caggtccagc tggtccagag cggggccgaa gtcaaaaaac ccggagcaag cgtgaaggtc tcctgcaaag catcaggcta tacatttaca ggcagctgga tgaactgggt gaggcaggct ccaggacagg gactggagtg gatcgggcgc atctaccctg gagacggcga aactaactat aatggaaagt tcaaagaccg agtgaccatc acagccgata agtctactag taccgcctac atggagctga gctccctgcg gtctgaagat accgccgtct actattgcgc tagaatttac ggaaacaatg tctattttga cgtgtggggg cagggaacaa ctgtgactgt ctcctccgcc tccaccaagg gcccatcggt cttccccctg gcaccctcct ccaagagcac ctctgggggc acagcggccc tgggctgcct ggtcaaggac tacttccccg aaccggtgac ggtgtcgtgg aactcaggcg ccctgaccag cggcgtgcac accttcccgg ctgtcctaca gtcctcagga ctctactccc tcagcagcgt ggtgaccgtg ccctccagca gcttgggcac ccagacctac atctgcaacg tgaatcacaa gcccagcaac accaaggtgg acaagagagt tgagcccaaa tcttgtgaca aaactcacac atgcccaccg tgcccagcac ctgaagccgc ggggggaccg tcagtcttcc tcttcccccc aaaacccaag gacaccctca tgatctcccg gacccctgag gtcacatgcg tggtggtgga cgtgagccac gaagaccctg aggtcaagtt caactggtac gtggacggcg tggaggtgca taatgccaag acaaagccgc gggaggagca gtacaacagc acgtaccgtg tggtcagcgt cctcaccgtc ctgcaccagg actggctgaa tggcaaggag tacaagtgca aggtctccaa caaagccctc ccagccccca tcgagaaaac catctccaaa gccaaagggc agccccgaga accacaggtg tacaccctgc ccccatcccg ggaggagatg accaagaacc aggtcagcct gagttgcgca gtcaaaggct tctatcccag cgacatcgcc gtggagtggg agagcaatgg gcagccggag aacaactaca agaccacgcc tcccgtgctg gactccgacg gctccttctt cctcgtcagc aagctcaccg tggacaagag caggtggcag caggggaacg tcttctcatg ctccgtgatg catgaggctc tgcacaaccg ctacacgcag aagagcctct ccctgtctcc gggtaaa

(606) The amino acid sequence of the fourth polypeptide chain of EphA2 mAb 2×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:290):

(607) TABLE-US-00200 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKRTVA APSVFIFPPS DEQLKSGTAS VVCLLNNFYP REAKVQWKVD NALQSGNSQE SVTEQDSKDS TYSLSSTLTL SKADYEKHKV YACEVTHQGL SSPVTKSFNR GEC

(608) In SEQ ID NO:290, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), and residues 107-213 correspond to the CL Kappa Domain (SEQ ID NO:210).

(609) A polynucleotide that encodes SEQ ID NO:290 is (SEQ ID NO:291):

(610) TABLE-US-00201 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaagcg tacggtggct gcaccatcgg tcttcatctt cccgccatct gatgagcagt tgaaatctgg aactgcctct gttgtgtgcc tgctgaataa cttctatccc agagaggcca aagtacagtg gaaggtggat aacgccctcc aatcgggtaa ctcccaggag agtgtcacag agcaggacag caaggacagc acctacagcc tcagcagcac cctgacgctg agcaaagcag actacgagaa acacaaagtc tacgcctgcg aagtcaccca tcagggcctg agctcgcccg tcacaaagag cttcaacagg ggagagtgt

P. EphA2 mAb 3×CD3 mAb 2×gpA33 mAb 1

(611) A third alternative EphA2/CD3/gpA33 Tri-Specific Binding Molecule was constructed. The molecule was composed of four polypeptide chains and comprises the VL and VH domains of EphA2 mAb 3, the VL and VH domains of antibody CD3 mAb 2 and the VL and VH domains of gpA33 mAb 1. The molecule was designated “EphA2 mAb 3×CD3 mAb 2×gpA33 mAb 1.” The amino acid sequence of the first polypeptide chain of this Tri-Specific Binding Molecule is (SEQ ID NO:292):

(612) TABLE-US-00202 DIVLTQSHRS MSTSVGDRVN ITCKASQDVT TAVAWYQQKP GQSPKLLIFW ASTRHAGVPD RFTGSGSGTD FTLTISSVQA GDLALYYCQQ HYSTPYTFGG GTKLEIKGGG SGGGGEVQLV ESGGGLVQPG GSLRLSCAAS GFTFSTYAMN WVRQAPGKGL EWVGRIRSKY NNYATYYADS VKGRFTISRD DSKNSLYLQM NSLKTEDTAV YYCVRHGNFG NSYVSWFAYW GQGTLVTVSS GGCGGGEVAA LEKEVAALEK EVAALEKEVA ALEKGGGDKT HTCPPCPAPE AAGGPSVFLF PPKPKDTLMI SRTPEVTCVV VDVSHEDPEV KFNWYVDGVE VHNAKTKPRE EQYNSTYRVV SVLTVLHQDW LNGKEYKCKV SNKALPAPIE KTISKAKGQP REPQVYTLPP SREEMTKNQV SLWCLVKGFY PSDIAVEWES NGQPENNYKT TPPVLDSDGS FFLYSKLTVD KSRWQQGNVF SCSVMHEALH NHYTQKSLSL SPGK

(613) In SEQ ID NO:292, amino acid residues 1-107 correspond to the amino acid sequence of the VL Domain of EphA2 mAb 3 (SEQ ID NO:172), residues 108-115 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 116-240 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 241-246 correspond to the GGCGGG linker (SEQ ID NO:34), residues 247-274 correspond to an E-coil Domain (SEQ ID NO:39), residues 275-277 are the linker GGG, residues 278-287 are the linker DKTHTCPPCP (SEQ ID NO:48), and residues 288-504 are the “knob-bearing” CH2-CH3 Domain (SEQ ID NO:52).

(614) A polynucleotide that encodes SEQ ID NO:292 is (SEQ ID NO:293):

(615) TABLE-US-00203 gacattgtgc tgacccagtc tcacagatcc atgtccacat cagtaggaga cagggtcaac atcacctgca aggccagtca ggatgtgact actgctgtag cctggtatca acaaaaacca gggcaatctc ctaaattact gattttctgg gcatccaccc ggcacgctgg agtccctgat cgcttcacag gcagtggatc tgggacagat tttactctca ccatcagcag tgtgcaggct ggagacctgg cactttatta ctgtcaacaa cattatagca caccgtacac attcggaggg gggaccaagc tggaaataaa aggtggagga tccggcggcg gaggcgaggt gcagctggtg gagtctgggg gaggcttggt ccagcctgga gggtccctga gactctcctg tgcagcctct ggattcacct tcagcacata cgctatgaat tgggtccgcc aggctccagg gaaggggctg gagtgggttg gaaggatcag gtccaagtac aacaattatg caacctacta tgccgactct gtgaagggta gattcaccat ctcaagagat gattcaaaga actcactgta tctgcaaatg aacagcctga aaaccgagga cacggccgtg tattactgtg tgagacacgg taacttcggc aattcttacg tgtcttggtt tgcttattgg ggacagggga cactggtgac tgtgtcttcc ggaggatgtg gcggtggaga agtggccgca ctggagaaag aggttgctgc tttggagaag gaggtcgctg cacttgaaaa ggaggtcgca gccctggaga aaggcggcgg ggacaaaact cacacatgcc caccgtgccc agcacctgaa gccgcggggg gaccgtcagt cttcctcttc cccccaaaac ccaaggacac cctcatgatc tcccggaccc ctgaggtcac atgcgtggtg gtggacgtga gccacgaaga ccctgaggtc aagttcaact ggtacgtgga cggcgtggag gtgcataatg ccaagacaaa gccgcgggag gagcagtaca acagcacgta ccgtgtggtc agcgtcctca ccgtcctgca ccaggactgg ctgaatggca aggagtacaa gtgcaaggtc tccaacaaag ccctcccagc ccccatcgag aaaaccatct ccaaagccaa agggcagccc cgagaaccac aggtgtacac cctgccccca tcccgggagg agatgaccaa gaaccaggtc agcctgtggt gcctggtcaa aggcttctat cccagcgaca tcgccgtgga gtgggagagc aatgggcagc cggagaacaa ctacaagacc acgcctcccg tgctggactc cgacggctcc ttcttcctct acagcaagct caccgtggac aagagcaggt ggcagcaggg gaacgtcttc tcatgctccg tgatgcatga ggctctgcac aaccactaca cgcagaagag cctctccctg tctccgggta aa

(616) The amino acid sequence of the second polypeptide chain of EphA2 mAb 3×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:294):

(617) TABLE-US-00204 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGEV QLVESGGGSV KPGGSLKLSC AASGFTFTDH YMYWVRQTPE KRLEWVATIS DGGSFTSYPD SVKGRFTISR DIAKNNLYLQ MSSLKSEDTA MYYCTRDESD RPFPYWGQGT LVTVSSGGCG GGKVAALKEK VAALKEKVAA LKEKVAALKE

(618) In SEQ ID NO:294, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 3 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-236 correspond to the amino acid sequence of the VH Domain of EphA2 mAb 3 (SEQ ID NO:177), residues 237-242 correspond to the linker GGCGGG (SEQ ID NO:34), and residues 243-270 are a K-coil Domain (SEQ ID NO:40).

(619) A polynucleotide that encodes SEQ ID NO:294 is (SEQ ID NO:295):

(620) TABLE-US-00205 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggagg tggagaagtg cagctggtgg agtctggggg aggctcagtg aagcctggag ggtccctgaa actctcctgt gcagcctctg gattcacttt cactgaccat tacatgtatt gggttcgcca gactccggaa aagaggctgg agtgggtcgc aaccattagt gatggcggta gtttcacctc ctatccagac agtgtgaagg ggcgattcac catctccaga gacattgcca agaacaacct gtacctccaa atgagcagtc tgaagtctga ggacacagcc atgtattact gtacaagaga tgagagcgat aggccgtttc cttactgggg ccaagggact ctggtcactg tctcctccgg aggatgtggc ggtggaaaag tggccgcact gaaggagaaa gttgctgctt tgaaagagaa ggtcgccgca cttaaggaaa aggtcgcagc cctgaaagag

(621) The amino acid sequence of the third polypeptide chain of EphA2 mAb 3×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:296):

(622) TABLE-US-00206 QVQLVQSGAE VKKPGASVKV SCKASGYTFT GSWMNWVRQA PGQGLEWIGR IYPGDGETNY NGKFKDRVTI TADKSTSTAY MELSSLRSED TAVYYCARIY GNNVYFDVWG QGTTVTVSSA STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY ICNVNHKPSN TKVDKRVEPK SCDKTHTCPP CPAPEAAGGP SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLSCA VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLVS KLTVDKSRWQ QGNVFSCSVM HEALHNRYTQ KSLSLSPGK

(623) In SEQ ID NO:296, amino acid residues 1-119 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 120-217 correspond to a modified CH1 Domain (SEQ ID NO:208), residues 218-232 correspond to a linker (SEQ ID NO:209), and residues 233-449 correspond to the “hole-bearing” CH2-CH3 Domain (SEQ ID NO:53).

(624) A polynucleotide that encodes SEQ ID NO:296 is (SEQ ID NO:297):

(625) TABLE-US-00207 caggtccagc tggtccagag cggggccgaa gtcaaaaaac ccggagcaag cgtgaaggtc tcctgcaaag catcaggcta tacatttaca ggcagctgga tgaactgggt gaggcaggct ccaggacagg gactggagtg gatcgggcgc atctaccctg gagacggcga aactaactat aatggaaagt tcaaagaccg agtgaccatc acagccgata agtctactag taccgcctac atggagctga gctccctgcg gtctgaagat accgccgtct actattgcgc tagaatttac ggaaacaatg tctattttga cgtgtggggg cagggaacaa ctgtgactgt ctcctccgcc tccaccaagg gcccatcggt cttccccctg gcaccctcct ccaagagcac ctctgggggc acagcggccc tgggctgcct ggtcaaggac tacttccccg aaccggtgac ggtgtcgtgg aactcaggcg ccctgaccag cggcgtgcac accttcccgg ctgtcctaca gtcctcagga ctctactccc tcagcagcgt ggtgaccgtg ccctccagca gcttgggcac ccagacctac atctgcaacg tgaatcacaa gcccagcaac accaaggtgg acaagagagt tgagcccaaa tcttgtgaca aaactcacac atgcccaccg tgcccagcac ctgaagccgc ggggggaccg tcagtcttcc tcttcccccc aaaacccaag gacaccctca tgatctcccg gacccctgag gtcacatgcg tggtggtgga cgtgagccac gaagaccctg aggtcaagtt caactggtac gtggacggcg tggaggtgca taatgccaag acaaagccgc gggaggagca gtacaacagc acgtaccgtg tggtcagcgt cctcaccgtc ctgcaccagg actggctgaa tggcaaggag tacaagtgca aggtctccaa caaagccctc ccagccccca tcgagaaaac catctccaaa gccaaagggc agccccgaga accacaggtg tacaccctgc ccccatcccg ggaggagatg accaagaacc aggtcagcct gagttgcgca gtcaaaggct tctatcccag cgacatcgcc gtggagtggg agagcaatgg gcagccggag aacaactaca agaccacgcc tcccgtgctg gactccgacg gctccttctt cctcgtcagc aagctcaccg tggacaagag caggtggcag caggggaacg tcttctcatg ctccgtgatg catgaggctc tgcacaaccg ctacacgcag aagagcctct ccctgtctcc gggtaaa

(626) The amino acid sequence of the fourth polypeptide chain of EphA2 mAb 3×CD3 mAb 2×gpA33 mAb 1 is (SEQ ID NO:298):

(627) TABLE-US-00208 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKRTVA APSVFIFPPS DEQLKSGTAS VVCLLNNFYP REAKVQWKVD NALQSGNSQE SVTEQDSKDS TYSLSSTLTL SKADYEKHKV YACEVTHQGL SSPVTKSFNR GEC

(628) In SEQ ID NO:298, amino acid residues 1-106 correspond to the amino acid sequence of the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), and residues 107-213 correspond to the CL Kappa Domain (SEQ ID NO:210).

(629) A polynucleotide that encodes SEQ ID NO:298 is (SEQ ID NO:299):

(630) TABLE-US-00209 gacattcagc tgactcagtc cccctctttt ctgtccgcat ccgtcggaga tcgagtgact attacttgct ctgctaggtc ctcaatcagc ttcatgtact ggtatcagca gaagcccggc aaagcaccta agctgctgat ctacgacaca agcaacctgg cctccggggt gccatctcgg ttctctggca gtgggtcagg aactgagttt accctgacaa ttagctccct ggaggctgaa gatgccgcta cctactattg ccagcagtgg agcagctatc ctctgacctt cggacagggg actaaactgg aaatcaagcg tacggtggct gcaccatcgg tcttcatctt cccgccatct gatgagcagt tgaaatctgg aactgcctct gttgtgtgcc tgctgaataa cttctatccc agagaggcca aagtacagtg gaaggtggat aacgccctcc aatcgggtaa ctcccaggag agtgtcacag agcaggacag caaggacagc acctacagcc tcagcagcac cctgacgctg agcaaagcag actacgagaa acacaaagtc tacgcctgcg aagtcaccca tcagggcctg agctcgcccg tcacaaagag cttcaacagg ggagagtgt

IV. Reference Antibodies and Diabodies

(631) In order to assist in the characterization of the Tri-Specific Binding Molecules of the present invention, the following reference diabodies were constructed.

Q. DR5 mAb 1×CD3 mAb 2 Diabody

(632) An exemplary bi-specific diabody composed of two polypeptide chains was constructed having the VL and VH domains of anti-human DR5 antibody DR5 mAb 1 and the VL and VH domains of CD3 mAb 2. The diabody was designated “DR5 mAb 1×CD3 mAb 2 diabody.” The amino acid sequence of the first polypeptide chain of this diabody is (SEQ ID NO:140):

(633) TABLE-US-00210 DIVLTQSPAS LAVSLGQRAT ISCRASKSVS SSGYSYMHWY QQKPGQPPKV LIFLSSNLDS GVPARFSGSG SGTDFTLNIH PVEDGDAATY YCQHSRDLPP TFGGGTKLEI KGGGSGGGGE VQLVESGGGL VQPGGSLRLS CAASGFTFST YAMNWVRQAP GKGLEWVGRI RSKYNNYATY YADSVKGRFT ISRDDSKNSL YLQMNSLKTE DTAVYYCVRH GNFGNSYVSW FAYWGQGTLV TVSSASTKGE VAACEKEVAA LEKEVAALEK EVAALEK

(634) In SEQ ID NO:140, amino acid residues 1-111 correspond to the amino acid sequence of the VL Domain of DR5 mAb 1 (SEQ ID NO:3), residues 112-119 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 120-244 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 245-249 correspond to the ASTKG linker (SEQ ID NO:47) and residues 250-277 correspond to a cysteine-containing E-coil Domain (SEQ ID NO:41). A polynucleotide that encodes SEQ ID NO:140 is SEQ ID NO:141:

(635) TABLE-US-00211 gacattgtgc tgacacagtc tcctgcttcc ttagctgtat ctctcgggca gagggccacc atctcatgca gggccagcaa aagtgtcagt tcctctggct atagttatat gcactggtac caacagaaac caggacagcc acccaaagtc ctcatctttc tttcatccaa cctagattct ggggtccctg ccaggttcag tggcagtggg tctgggacag acttcaccct caacatccat cctgtggagg atggggatgc tgcaacctat tactgtcagc acagtaggga tcttcctccg acgttcggtg gaggcaccaa gctggaaatc aaaggaggcg gatccggcgg cggaggcgag gtgcagctgg tggagtctgg gggaggcttg gtccagcctg gagggtccct gagactctcc tgtgcagcct ctggattcac cttcagcaca tacgctatga attgggtccg ccaggctcca gggaaggggc tggagtgggt tggaaggatc aggtccaagt acaacaatta tgcaacctac tatgccgact ctgtgaaggg tagattcacc atctcaagag atgattcaaa gaactcactg tatctgcaaa tgaacagcct gaaaaccgag gacacggccg tgtattactg tgtgagacac ggtaacttcg gcaattctta cgtgtcttgg tttgcttatt ggggacaggg gacactggtg actgtgtctt ccgcctccac caagggcgaa gtggccgcat gtgagaaaga ggttgctgct ttggagaagg aggtcgctgc acttgaaaag gaggtcgcag ccctggagaa a

(636) The amino acid sequence of the second polypeptide chain of the DR5 mAb 1×CD3 mAb 2 diabody is (SEQ ID NO:142):

(637) TABLE-US-00212 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGEV KFLESGGGLV QPGGSLKLSC VASGFDFSRY WMSWVRQAPG KGLEWIGEIN PDSNTINYTP SLKDKFIISR DNAKNTLYLQ MTKVRSEDTA LYYCTRRAYY GNPAWFAYWG QGTLVTVSAA STKGKVAACK EKVAALKEKV AALKEKVAAL KE

(638) In SEQ ID NO:142, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-239 correspond to the amino acid sequence of the VH Domain of DR5 mAb 1 (SEQ ID NO:8), except that the C-terminal serine residue of SEQ ID NO:8 has been replaced with an alanine residue), residues 240-244 correspond to an ASTKG linker (SEQ ID NO:47), and residues 245-272 correspond to a cysteine-containing K-coil Domain (SEQ ID NO:42). A polynucleotide that encodes SEQ ID NO:142 is SEQ ID NO:143:

(639) TABLE-US-00213 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga ggtggtggat ccggcggcgg aggcgaggtg aagtttctcg agtctggagg tggcctggtg cagcctggag gatccctgaa actctcctgt gtagcctcag gattcgattt tagtagatac tggatgagtt gggtccggca ggctccaggg aaagggctag aatggattgg agaaattaat ccagatagca atacgataaa ctatacgcca tctctaaagg ataaattcat catctccaga gacaacgcca aaaatacgct gtatctgcaa atgaccaaag tgagatctga ggacacagcc ctttattatt gtacaagaag ggcctactat ggtaacccgg cctggtttgc ttactggggc caagggactc tggtcactgt ctctgcagcc tccaccaagg gcaaagtggc cgcatgtaag gagaaagttg ctgctttgaa agagaaggtc gccgcactta aggaaaaggt cgcagccctg aaagag

R. DR5 mAb 2×CD3 mAb 2 Diabody

(640) An exemplary bi-specific diabody composed of two polypeptide chains was constructed having the VL and VH domains of anti-human DR5 antibody DR5 mAb 2 and the VL and VH domains of CD3 mAb 2. The diabody was designated “DR5 mAb 2×CD3 mAb 2 diabody.” The amino acid sequence of the first polypeptide chain of this diabody is (SEQ ID NO:144):

(641) TABLE-US-00214 DIVMTQSHKF MSTSVGDRVS ITCKASQDVN TAVAWYQQKP GQSPKLLIYW ASTRHTGVPD RFTGSGSGTD YTLTIKSVQA EDLTLYYCQQ HYITPWTFGG GTKLEIKGGG SGGGGEVQLV ESGGGLVQPG GSLRLSCAAS GFTFSTYAMN WVRQAPGKGL EWVGRIRSKY NNYATYYADS VKGRFTISRD DSKNSLYLQM NSLKTEDTAV YYCVRHGNFG NSYVSWFAYW GQGTLVTVSS ASTKGEVAAC EKEVAALEKE VAALEKEVAA LEK

(642) In SEQ ID NO:144, amino acid residues 1-107 correspond to the amino acid sequence of the VL Domain of DR5 mAb 2 (SEQ ID NO:13), residues 108-115 correspond to intervening spacer peptide (Linker 1) (SEQ ID NO:33), residues 116-240 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 241-245 correspond to an ASTKG linker (SEQ ID NO:47) and residues 246-273 correspond to a cysteine-containing E-coil Domain (SEQ ID NO:41). A polynucleotide that encodes SEQ ID NO:144 is SEQ ID NO:145:

(643) TABLE-US-00215 gacattgtga tgacccagtc tcacaaattc atgtccactt cagtaggaga cagggtcagc atcacctgca aggccagtca ggatgtgaat actgctgtag cctggtatca acaaaaacca gggcaatctc ctaaactact gatttactgg gcatccaccc ggcacactgg agtccctgat cgcttcacag gcagtggatc tgggacagat tatacactca ccatcaaaag tgtgcaggct gaagacctga cactttatta ctgtcagcaa cactatatca ctccgtggac gttcggtgga ggcaccaagc tggaaatcaa aggaggcgga tccggcggcg gaggcgaggt gcagctggtg gagtctgggg gaggcttggt ccagcctgga gggtccctga gactctcctg tgcagcctct ggattcacct tcagcacata cgctatgaat tgggtccgcc aggctccagg gaaggggctg gagtgggttg gaaggatcag gtccaagtac aacaattatg caacctacta tgccgactct gtgaagggta gattcaccat ctcaagagat gattcaaaga actcactgta tctgcaaatg aacagcctga aaaccgagga cacggccgtg tattactgtg tgagacacgg taacttcggc aattcttacg tgtcttggtt tgcttattgg ggacagggga cactggtgac tgtgtcttcc gcctccacca agggcgaagt ggccgcatgt gagaaagagg ttgctgcttt ggagaaggag gtcgctgcac ttgaaaagga ggtcgcagcc ctggagaaa

(644) The amino acid sequence of the second polypeptide chain of the DR5 mAb 2×CD3 mAb 2 diabody is (SEQ ID NO:146):

(645) TABLE-US-00216 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGKV QLQQSGAELV KPGASVKLSC KASGYTFTEY ILHWVKQKSG QGLEWIGWFY PGNNNIKYNE KFKDKATLTA DKSSSTVYME LSRLTSEDSA VYFCARHEQG PGYFDYWGQG TTLTVSSAST KGKVAACKEK VAALKEKVAA LKEKVAALKE

(646) In SEQ ID NO:146, amino acid residues 1-110 correspond to the amino acid sequence of the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-237 correspond to the amino acid sequence of the VH Domain of DR5 mAb 2 (SEQ ID NO:18), residues 238-242 correspond to an ASTKG linker (SEQ ID NO:47), and residues 243-270 correspond to a cysteine-containing K-coil Domain (SEQ ID NO:42). A polynucleotide that encodes SEQ ID NO:146 is SEQ ID NO:147:

(647) TABLE-US-00217 caggctgtgg tgactcagga gccttcactg accgtgtccc caggcggaac tgtgaccctg acatgcagat ccagcacagg cgcagtgacc acatctaact acgccaattg ggtgcagcag aagccaggac aggcaccaag gggcctgatc gggggtacaa acaaaagggc tccctggacc cctgcacggt tttctggaag tctgctgggc ggaaaggccg ctctgactat taccggggca caggccgagg acgaagccga ttactattgt gctctgtggt atagcaatct gtgggtgttc gggggtggca caaaactgac tgtgctggga gggggtggat ccggcggcgg aggcaaggtc cagctgcagc agtctggagc tgaactggtg aaacccgggg catcagtgaa gctgtcctgc aaggcttctg ggtacacctt cactgagtat attttacact gggtaaagca gaagtctgga cagggtcttg agtggattgg gtggttttat cctggaaata ataatataaa gtacaatgag aaattcaagg acaaggccac actgactgcg gacaaatcct ccagcacagt ctatatggaa cttagtagat tgacatctga agactctgcg gtctatttct gtgcaagaca cgaacaagga ccaggttact ttgactactg gggccaaggc accactctca cagtctcctc cgcctccacc aagggcaaag tggccgcatg taaggagaaa gttgctgctt tgaaagagaa ggtcgccgca cttaaggaaa aggtcgcagc cctgaaagag

S. DR5 mAb 3×CD3 mAb 2 Diabody

(648) An exemplary bi-specific diabody composed of two polypeptide chains was constructed having the VL and VH domains of anti-human DR5 antibody DR5 mAb 3 and the VL and VH domains of CD3 mAb 2. The amino acid sequence of the first polypeptide chain of the diabody had the sequence (SEQ ID NO:148) (CDR residues are shown underlined):

(649) TABLE-US-00218 SELTQDPAVS VALGQTVRIT CSGDSLRSYY ASWYQQKPGQ APVLVIYGAN NRPSGIPDRF SGSSSGNTAS LTITGAQAED EADYYCNSAD SSGNHVVFGG GTKLTVLGGG GSGGGGEVQL VESGGGLVQP GGSLRLSCAA SGFTFSTYAM NWVRQAPGKG LEWVGRIRSK YNNYATYYAD SVKGRFTISR DDSKNSLYLQ MNSLKTEDTA VYYCVRHGNF GNSYVSWFAY WGQGTLVTVS SASTKGEVAA CEKEVAALEK EVAALEKEVA ALEK

(650) In SEQ ID NO:148, amino acid residues 1-108 correspond to the VL Domain of DR5 mAb 3 (SEQ ID NO:54), residues 109-116 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 117-241 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 242-246 correspond to an ASTKG linker (SEQ ID NO:47), and residues 247-275 correspond to a cysteine-containing K-coil Domain (SEQ ID NO:42).

(651) The amino acid sequence of the second polypeptide chain of the diabody had the sequence (SEQ ID NO:149) (CDR residues are shown underlined):

(652) TABLE-US-00219 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGEV QLVQSGGGVE RPGGSLRLSC AASGFTFDDY AMSWVRQAPG KGLEWVSGIN WQGGSTGYAD SVKGRVTISR DNAKNSLYLQ MNSLRAEDTA VYYCAKILGA GRGWYFDYWG KGTTVTVSSA STKGKVAACK EKVAALKEKV AALKEKVAAL KE

(653) In SEQ ID NO:149, amino acid residues 1-110 correspond to the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-239 correspond to the amino acid sequence of the VH Domain of DR5 mAb 3 (SEQ ID NO:58), residues 240-244 correspond to an ASTKG linker (SEQ ID NO:47), and residues 245-272 correspond to a cysteine-containing K-coil Domain (SEQ ID NO:42).

T. DR5 mAb 4×CD3 mAb 2 Diabody

(654) An exemplary bi-specific diabody composed of two polypeptide chains was constructed having the VL and VH domains of anti-human DR5 antibody DR5 mAb 4 and the VL and VH domains of CD3 mAb 2. The amino acid sequence of the first polypeptide chain of the diabody had the sequence (SEQ ID NO:150) (CDR residues are shown underlined):

(655) TABLE-US-00220 EIVLTQSPGT LSLSPGERAT LSCRASQGIS RSYLAWYQQK PGQAPSLLIY GASSRATGIP DRFSGSGSGT DFTLTISRLE PEDFAVYYCQ QFGSSPWTFG QGTKVEIKGG GSGGGGEVQL VESGGGLVQP GGSLRLSCAA SGFTFSTYAM NWVRQAPGKG LEWVGRIRSK YNNYATYYAD SVKGRFTISR DDSKNSLYLQ MNSLKTEDTA VYYCVRHGNF GNSYVSWFAY WGQGTLVTVS SASTKGEVAA CEKEVAALEK EVAALEKEVA ALEK

(656) In SEQ ID NO:150, amino acid residues 1-108 correspond to the VL Domain of DR5 mAb 4 (SEQ ID NO:62), residues 109-116 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 117-241 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 242-246 correspond to an ASTKG linker (SEQ ID NO:47), and residues 247-275 correspond to a cysteine-containing E-coil Domain (SEQ ID NO:41).

(657) The amino acid sequence of the second polypeptide chain of the diabody had the sequence (SEQ ID NO:151) (CDR residues are shown underlined):

(658) TABLE-US-00221 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLQESGPGLV KPSQTLSLTC TVSGGSISSG DYFWSWIRQL PGKGLEWIGH IHNSGTTYYN PSLKSRVTIS VDTSKKQFSL RLSSVTAADT AVYYCARDRG GDYYYGMDVW GQGTTVTVSS ASTKGKVAAC KEKVAALKEK VAALKEKVAA LKE

(659) In SEQ ID NO:151, amino acid residues 1-110 correspond to the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-240 correspond to the amino acid sequence of the VH Domain of DR5 mAb 4 (SEQ ID NO:66), residues 241-245 correspond to an ASTKG linker (SEQ ID NO:47), and residues 246-273 correspond to a cysteine-containing K-coil Domain (SEQ ID NO:42).

U. Reference gpA33×CD3 mAb 2 Diabody

(660) To further exemplify the bi-specific Tri-Specific Binding Molecules of the present invention, a diabody composed of two polypeptide chains was constructed using the VL and VH domains of gpA33 mAb 1 and CD3 mAb 2. The amino acid sequence of the first polypeptide chain of the diabody had the sequence (SEQ ID NO:316) (CDR residues are shown underlined):

(661) TABLE-US-00222 DIQLTQSPSF LSASVGDRVT ITCSARSSIS FMYWYQQKPG KAPKLLIYDT SNLASGVPSR FSGSGSGTEF TLTISSLEAE DAATYYCQQW SSYPLTFGQG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSTYAMNW VRQAPGKGLE WVGRIRSKYN NYATYYADSV KGRFTISRDD SKNSLYLQMN SLKTEDTAVY YCVRHGNFGN SYVSWFAYWG QGTLVTVSSA STKGEVAACE KEVAALEKEV AALEKEVAAL EK

(662) In SEQ ID NO:316, amino acid residues 1-106 correspond to the VL Domain of gpA33 mAb 1 (SEQ ID NO:181), residues 107-114 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 115-239 correspond to the amino acid sequence of the VH Domain of CD3 mAb 2 having the D65G substitution (SEQ ID NO:112), residues 240-244 correspond to an ASTKG linker (SEQ ID NO:47), and residues 245-272 correspond to a cysteine-containing E-coil Domain (SEQ ID NO:41).

(663) The amino acid sequence of the second polypeptide chain of the diabody had the sequence (SEQ ID NO:317) (CDR residues are shown underlined):

(664) TABLE-US-00223 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGQV QLVQSGAEVK KPGASVKVSC KASGYTFTGS WMNWVRQAPG QGLEWIGRIY PGDGETNYNG KFKDRVTITA DKSTSTAYME LSSLRSEDTA VYYCARIYGN NVYFDVWGQG TTVTVSSAST KGKVAACKEK VAALKEKVAA LKEKVAALKE

(665) In SEQ ID NO:317, amino acid residues 1-110 correspond to the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-237 correspond to the amino acid sequence of the VH Domain of gpA33 mAb 1 (SEQ ID NO:186), residues 238-242 correspond to an ASTKG linker (SEQ ID NO:47), and residues 243-270 correspond to a cysteine-containing K-coil Domain (SEQ ID NO:42).

V. Reference Anti-Fluorescein Antibody

(666) The anti-fluorescein antibody 4-4-20 (Gruber, M. et al. (1994) “Efficient Tumor Cell Lysis Mediated By A Bi-specific Single Chain Antibody Expressed In Escherichia coli,” J. Immunol. 152(11):5368-5374; Bedzyk, W. D. et al. (1989) “Comparison Of Variable Region Primary Structures Within An Anti-Fluorescein Idiotype Family,” J. Biol. Chem. 264(3): 1565-1569) was used in control diabodies. The amino acid sequences of the variable light and variable heavy Domains of anti-fluorescein antibody 4-4-20 are as follows:

(667) Amino Acid Sequence Of The Variable Light Chain Domain Of Anti-Fluorescein Antibody 4-4-20 (SEQ ID NO:138) (CDR residues are underlined):

(668) TABLE-US-00224 DVVMTQTPFS LPVSLGDQAS ISCRSSQSLV HSNGNTYLRW YLQKPGQSPK VLIYKVSNRF SGVPDRFSGS GSGTDFTLKI SRVEAEDLGV YFCSQSTHVP WTFGGGIKLE IK

(669) Amino Acid Sequence Of The Variable Heavy Chain Domain Of Anti-Fluorescein Antibody 4-4-20 (SEQ ID NO:139) (CDR residues are underlined):

(670) TABLE-US-00225 EVKLDETGGG LVQPGRPMKL SCVASGFTFS DYWMNWVRQS PEKGLEWVAQ IRNKPYNYET YYSDSVKGRF TISRDDSKSS VYLQMNNLRV EDMGIYYCTG SYYGMDYWGQ GTSVTVSS

V. Methods of Production

(671) The Tri-Specific Binding Molecules of the present invention can be created from the polynucleotides and/or sequences of antibodies that are immunospecific for DR5, a desired Cancer Antigen, and a desired Effector Cell by methods known in the art, for example, synthetically or recombinantly. One method of producing such peptide agonists, antagonists and modulators involves chemical synthesis of the polypeptide, followed by treatment under oxidizing conditions appropriate to obtain the native conformation, that is, the correct disulfide bond linkages. This can be accomplished using methodologies well-known to those skilled in the art (see, e.g., Kelley, R. F. et al. (1990) In: GENETIC ENGINEERING PRINCIPLES AND METHODS, Setlow, J. K. Ed., Plenum Press, N.Y., vol. 12, pp 1-19; Stewart, J. M et al. (1984) SOLID PHASE PEPTIDE SYNTHESIS, Pierce Chemical Co., Rockford, Ill.; see also U.S. Pat. Nos. 4,105,603; 3,972,859; 3,842,067; and 3,862,925).

(672) Polypeptides of the invention may be conveniently prepared using solid phase peptide synthesis (Merrifield, B. (1986) “Solid Phase Synthesis,” Science 232(4748):341-347; Houghten, R. A. (1985) “General Method For The Rapid Solid-Phase Synthesis Of Large Numbers Of Peptides: Specificity Of Antigen Antibody Interaction At The Level Of Individual Amino Acids,” Proc. Natl. Acad. Sci. (U.S.A.) 82(15):5131-5135; Ganesan, A. (2006) “Solid-Phase Synthesis In The Twenty-First Century,” Mini Rev. Med. Chem. 6(1):3-10).

(673) In yet another alternative, suitable antibodies having one or more of the CDRs of a desired anti-DR5 antibody, anti-Cancer Antigen antibody or anti-Effector Cell antibody may be obtained through the use of commercially available mice that have been engineered to express specific human immunoglobulin proteins. Transgenic animals that are designed to produce a more desirable (e.g., fully human antibodies) or more robust immune response may also be used for generation of humanized or human antibodies. Examples of such technology are XENOMOUSE™ (Abgenix, Inc., Fremont, Calif.) and HUMAB-MOUSE® and TC MOUSE™ (both from Medarex, Inc., Princeton, N.J.).

(674) In an alternative, antibodies may be made recombinantly and expressed using any method known in the art. Antibodies may be made recombinantly by first isolating the antibodies made from host animals, obtaining the gene sequence, and using the gene sequence to express the antibody recombinantly in host cells (e.g., CHO cells). Another method that may be employed is to express the antibody sequence in plants {e.g., tobacco) or transgenic milk. Suitable methods for expressing antibodies recombinantly in plants or milk have been disclosed (see, for example, Peeters et al. (2001) “Production Of Antibodies And Antibody Fragments In Plants,” Vaccine 19:2756; Lonberg, N. et al. (1995) “Human Antibodies From Transgenic Mice,” Int. Rev. Immunol 13:65-93; and Pollock et al. (1999) “Transgenic Milk As A Method For The Production Of Recombinant Antibodies,” J. Immunol Methods 231:147-157). Suitable methods for making derivatives of antibodies, e.g., humanized, single-chain, etc. are known in the art. In another alternative, antibodies may be made recombinantly by phage display technology (see, for example, U.S. Pat. Nos. 5,565,332; 5,580,717; 5,733,743; 6,265,150; and Winter, G. et al. (1994) “Making Antibodies By Phage Display Technology,” Annu. Rev. Immunol. 12.433-455).

(675) The antibodies or protein of interest may be subjected to sequencing by Edman degradation, which is well-known to those of skill in the art. The peptide information generated from mass spectrometry or Edman degradation can be used to design probes or primers that are used to clone the protein of interest.

(676) An alternative method of cloning the protein of interest is by “panning” using purified DR5, and/or a desired Cancer Antigen, and/or a molecule expressed on the surface of a desired Effector Cell (or portions of any such molecules), for cells expressing an antibody or protein of interest that possesses one or more CDRs so as to be capable of binding to DR5, or such desired Cancer Antigen or Effector Cell molecule. The “panning” procedure may be conducted by obtaining a cDNA library from tissues or cells that express DR5, overexpressing the cDNAs in a second cell type, and screening the transfected cells of the second cell type for a specific binding to DR5 in the presence or absence of a known antibody that is capable of binding to such molecule (e.g., DR5 mAb 1 or DR5 mAb 2 in the case of panning for new anti-DR5 antibodies, etc.). Detailed descriptions of the methods used in cloning mammalian genes coding for cell surface proteins by “panning” can be found in the art (see, for example, Aruffo, A. et al. (1987) “Molecular Cloning Of A CD28 cDNA By A High-Efficiency COS Cell Expression System,” Proc. Natl. Acad. Sci. (U.S.A.) 84:8573-8577 and Stephan, J. et al. (1999) “Selective Cloning Of Cell Surface Proteins Involved In Organ Development: Epithelial Glycoprotein Is Involved In Normal Epithelial Differentiation,” Endocrinol. 140:5841-5854).

(677) Vectors containing polynucleotides of interest can be introduced into the host cell by any of a number of appropriate means, including electroporation, transfection employing calcium chloride, rubidium chloride, calcium phosphate, DEAE-dextran, or other substances; microprojectile bombardment; lipofection; and infection (e.g., where the vector is an infectious agent such as vaccinia virus). The choice of introducing vectors or polynucleotides will often depend on features of the host cell.

(678) Any host cells capable of overexpressing heterologous DNAs can be used for the purpose of isolating the genes encoding the antibody, polypeptide or protein of interest. Non-limiting examples of suitable mammalian host cells include but are not limited to COS, HeLa, and CHO cells. Preferably, the host cells express the cDNAs at a level of about 5-fold higher, more preferably 10-fold higher, even more preferably 20-fold higher than that of the corresponding endogenous antibody or protein of interest, if present, in the host cells. Screening the host cells for a specific binding to DR5 is effected by an immunoassay or FACS. A cell overexpressing the antibody or protein of interest can be identified.

(679) The invention includes polypeptides comprising an amino acid sequence of the antibodies of this invention. The polypeptides of this invention can be made by procedures known in the art. The polypeptides can be produced by proteolytic or other degradation of the antibodies, by recombinant methods (i.e., single or fusion polypeptides) as described above or by chemical synthesis. Polypeptides of the antibodies, especially shorter polypeptides up to about 50 amino acids, are conveniently made by chemical synthesis. Methods of chemical synthesis are known in the art and are commercially available. For example, an anti-DR5 polypeptide could be produced by an automated polypeptide synthesizer employing the solid phase method.

(680) The invention includes modifications to any such antibodies (or to any of their polypeptide fragments that bind to DR5, the Cancer Antigen or the effector cell, as the case may be) and the agonists, antagonists, and modulators of such molecules, including functionally equivalent antibodies and fusion polypeptides that do not significantly affect the properties of such molecules as well as variants that have enhanced or decreased activity. Modification of polypeptides is routine practice in the art and need not be described in detail herein. Examples of modified polypeptides include polypeptides with conservative substitutions of amino acid residues, one or more deletions or additions of amino acids which do not significantly deleteriously change the functional activity, or use of chemical analogs. Amino acid residues which can be conservatively substituted for one another include but are not limited to: glycine/alanine; serine/threonine; valine/isoleucine/leucine; asparagine/glutamine; aspartic acid/glutamic acid; lysine/arginine; and phenylalanine/tyrosine. These polypeptides also include glycosylated and non-glycosylated polypeptides, as well as polypeptides with other post-translational modifications, such as, for example, glycosylation with different sugars, acetylation, and phosphorylation. Preferably, the amino acid substitutions would be conservative, i.e., the substituted amino acid would possess similar chemical properties as that of the original amino acid. Such conservative substitutions are known in the art, and examples have been provided above. Amino acid modifications can range from changing or modifying one or more amino acids to complete redesign of a region, such as the variable region. Changes in the variable region can alter binding affinity and/or specificity. Other methods of modification include using coupling techniques known in the art, including, but not limited to, enzymatic means, oxidative substitution and chelation. Modifications can be used, for example, for attachment of labels for immunoassay, such as the attachment of radioactive moieties for radioimmunoassay. Modified polypeptides are made using established procedures in the art and can be screened using standard assays known in the art.

(681) The invention encompasses fusion proteins comprising one or more of the polypeptides of this invention. In one embodiment, a fusion polypeptide is provided that comprises a light chain, a heavy chain or both a light and heavy chain. In another embodiment, the fusion polypeptide contains a heterologous immunoglobulin constant region. In another embodiment, the fusion polypeptide contains a light chain variable region and a heavy chain variable region of an antibody produced from a publicly-deposited hybridoma. For purposes of this invention, an antibody fusion protein contains one or more polypeptide domains that specifically bind to DR5, a Cancer Antigen, or an effector cell (as the case may be) and another amino acid sequence to which it is not attached in the native molecule, for example, a heterologous sequence or a homologous sequence from another region.

VI. Uses of the Trispecific Binding Molecules of the Present Invention

(682) The Tri-Specific Binding Molecules of the present invention provide a general therapy for cancer. The cancers that may be treated by such molecules include cancers characterized by the presence of a cancer cell selected from the group consisting of a cell of: an adrenal gland tumor, an AIDS-associated cancer, an alveolar soft part sarcoma, an astrocytic tumor, bladder cancer, bone cancer, a brain and spinal cord cancer, a metastatic brain tumor, a breast cancer, a carotid body tumors, a cervical cancer, a chondrosarcoma, a chordoma, a chromophobe renal cell carcinoma, a clear cell carcinoma, a colon cancer, a colorectal cancer, a cutaneous benign fibrous histiocytoma, a desmoplastic small round cell tumor, an ependymoma, a Ewing's tumor, an extraskeletal myxoid chondrosarcoma, a fibrogenesis imperfecta ossium, a fibrous dysplasia of the bone, a gallbladder or bile duct cancer, gastric cancer, a gestational trophoblastic disease, a germ cell tumor, a head and neck cancer, hepatocellular carcinoma, an islet cell tumor, a Kaposi's Sarcoma, a kidney cancer, a leukemia, a lipoma/benign lipomatous tumor, a liposarcoma/malignant lipomatous tumor, a liver cancer, a lymphoma, a lung cancer, a medulloblastoma, a melanoma, a meningioma, a multiple endocrine neoplasia, a multiple myeloma, a myelodysplastic syndrome, a neuroblastoma, a neuroendocrine tumors, an ovarian cancer, a pancreatic cancer, a papillary thyroid carcinoma, a parathyroid tumor, a pediatric cancer, a peripheral nerve sheath tumor, a phaeochromocytoma, a pituitary tumor, a prostate cancer, a posterious uveal melanoma, a rare hematologic disorder, a renal metastatic cancer, a rhabdoid tumor, a rhabdomysarcoma, a sarcoma, a skin cancer, a soft-tissue sarcoma, a squamous cell cancer, a stomach cancer, a synovial sarcoma, a testicular cancer, a thymic carcinoma, a thymoma, a thyroid metastatic cancer, and a uterine cancer. The Tri-Specific Binding Molecules of the present invention may be used in the treatment of colorectal cancer, hepatocellular carcinoma, glioma, kidney cancer, breast cancer, multiple myeloma, bladder cancer, neuroblastoma; sarcoma, non-Hodgkin's lymphoma, non-small cell lung cancer, ovarian cancer, pancreatic cancer and rectal cancer.

(683) The Tri-Specific Binding Molecules of the present invention augment the cancer therapy provided by an antibody directed to a Cancer Antigen that is characteristic of cells of a target tumor by being additionally able to bind to DR5 molecules arrayed on the surface of such tumor cells. The utility of the invention is particularly seen in circumstances in which the density of the Cancer Antigen is low, or when the binding kinetics of the anti-Cancer Antigen antibody is suboptimal (or insufficient) to promote a clinically sufficient therapeutic response. In such cases, the ability of the molecules of the present invention to bind both the Cancer Antigen and DR5 of the tumor cells provides enhanced binding (via avidity) that is sufficient to promote a clinically sufficient therapeutic response. Additionally, by also possessing a Binding Domain capable of binding to a molecule on the surface of an immune system effector cell, the Tri-Specific Binding Molecules of the present invention permit the co-localization of such immune system cells to the tumor cells, thereby promoting a cytotoxic response against the tumor cells via redirected killing.

(684) As shown in Table 2, Tri-Specific Binding Molecules of the present invention that possess particular combinations of Cancer Antigen-Binding Domains have preferred utility in the treatment of specific cancers.

(685) TABLE-US-00226 TABLE 2 Cancer Antigen-Binding Domains Preferred Utility gpA33 DR5 Treatment Of Colorectal Cancer gpA33 EphA2 gpA33 B7-H3 gpA33 BST2 5T4 EphA2 Broadly Applicable To Treatment 5T4 CEACAM5 Of Many Types Of Cancers 5T4 B7-H3 5T4 DR5 B7-H3 CEACAM5 B7-H3 CEACAM6 B7-H3 IL1Rα2 Glioblastoma, Melanoma EphA2 IL1Rα2 EphA2 DR5 Broadly Applicable To Treatment EphA2 CEACAM5 Of Many Types Of Cancers EphA2 CEACAM6 ITGB6 B7-H3 ITGB6 DR5 ITGB6 BST2 BST2 CEACAM5 BST2 EGFR

(686) In addition to their utility in therapy, the Tri-Specific Binding Molecules of the present invention may be detectably labeled and used in the diagnosis of cancer or in the imaging of tumors and tumor cells.

VII. Pharmaceutical Compositions

(687) The compositions of the invention include bulk drug compositions useful in the manufacture of pharmaceutical compositions (e.g., impure or non-sterile compositions) and pharmaceutical compositions (i.e., compositions that are suitable for administration to a subject or patient) which can be used in the preparation of unit dosage forms. Such compositions comprise a prophylactically or therapeutically effective amount of the Tri-Specific Binding Molecules of the present invention, or a combination of such agents and a pharmaceutically acceptable carrier. Preferably, compositions of the invention comprise a prophylactically or therapeutically effective amount of the Tri-Specific Binding Molecules of the present invention and a pharmaceutically acceptable carrier. The invention particularly encompasses such pharmaceutical compositions in which the Tri-Specific Binding Molecule has a DR5-Binding Domain of: (1) a DR5 mAb 1 antibody; (2) a DR5 mAb 2 antibody; (3) a DR5 mAb 3 antibody; (4) a DR5 mAb 4 antibody; (5) a DR5 mAb 5 antibody; (6) a DR5 mAb 6 antibody; (7) a DR5 mAb 7 antibody; or (8) a DR5 mAb 8 antibody
(or a humanized derivative of any such antibodies).

(688) The invention further particularly encompasses such pharmaceutical compositions in which the Tri-Specific Binding Molecule has a Cancer Antigen-Binding Domain that: (A) binds to an epitope of EphA2, especially wherein the Tri-Specific Binding Molecule has a Cancer Antigen-Binding Domain of EphA2 mAb 1, EphA2 mAb 2 or EphA2 mAb 3, or a humanized or chimeric variant thereof; or (B) binds to an epitope of gpA33, especially wherein the Tri-Specific Binding Molecule has a Cancer Antigen-Binding Domain of gpA33 mAb 1, or a humanized or chimeric variant thereof or (C) binds to an epitope of Her2, especially wherein the Tri-Specific Binding Molecule has a Cancer Antigen-Binding Domain of Her2 mAb 1 or trastuzumab, or a humanized or chimeric variant thereof or (D) binds to an epitope of B7-H3, especially wherein the Tri-Specific Binding Molecule has a Cancer Antigen-Binding Domain of B7-H3 mAb 1, B7-H3 mAb 2, or B7-H3 mAb 3, or a humanized or chimeric variant thereof.

(689) The invention further particularly encompasses such pharmaceutical compositions in which the Tri-Specific Binding Molecule has an Effector Cell-Binding Domain that binds to CD2, CD3, CD17, CD20, CD22, CD32B, CD64, BCR/CD79, the T cell Receptor or the NKG2D Receptor. The invention further particularly encompasses such pharmaceutical compositions in which the Tri-Specific Binding Molecule has an Effector Cell-Binding Domain of antibody: Lo-CD2a, CD3 mAb 2, OKT3, 3G8, A9, HD37, rituximab, epratuzumab, CD32B mAb 1, CD64 mAb 1, CD79 mAb 1, BMA 031, KYK-1.0, or KYK-2.0.

(690) The invention specifically contemplates Tri-Specific Binding Molecules, pharmaceutical compositions that comprise such binding molecule and uses of such Tri-Specific Binding Molecules, in which: (1) the DR5 Binding Domain is a DR5 binding domain of any anti-DR5 antibody; (2) the Cancer Binding Domain is any of the Cancer Antigens disclosed herein; and (3) the Effector Cell-Binding Domains binds to any of CD2, CD3, CD17, CD20, CD22, CD32B, CD64, BCR/CD79, the T cell Receptor or the NKG2D Receptor.

(691) The invention further specifically contemplates Tri-Specific Binding Molecules, pharmaceutical compositions that comprise such binding molecule and uses of such Tri-Specific Binding Molecules, in which: (1) the DR5 Binding Domain is a DR5 binding domain of any anti-DR5 antibody; (2) the Cancer Binding Domain is any of: EphA1, gpA33, Her2, or B7-H3; and (3) the Effector Cell-Binding Domains binds to any of CD2, CD3, CD17, CD20, CD22, CD32B, CD64, BCR/CD79, the T cell Receptor or the NKG2D Receptor.

(692) The invention particularly contemplates each of the Tri-Specific Binding Molecules, as well as pharmaceutical compositions that comprise such binding molecule and uses of such Tri-Specific Binding Molecules, in which: (1) the DR5 Binding Domain is a DR5 binding domain of any of: a DR5 mAb 1 antibody, a DR5 mAb 2 antibody, a DR5 mAb 3 antibody, a DR5 mAb 4 antibody, a DR5 mAb 5 antibody, a DR5 mAb 6 antibody, a DR5 mAb 7 antibody, or a DR5 mAb 8 antibody; (2) the Cancer Antigen-Binding Domain is a binding domain of any of: EphA2 mAb 1, EphA2 mAb 2, EphA2 mAb 3, gpA33 mAb 1, Her2 mAb 1, trastuzumab, B7-H3 mAb 1, B7-H3 mAb 2, or B7-H3 mAb 3; and (3) the Effector Cell-Binding Domain is a binding domain of any of: Lo-CD2a, CD3 mAb 2, OKT3, 3G8, A9, HD37, rituximab, epratuzumab, CD32B mAb 1, CD64 mAb 1, CD79 mAb 1, BMA 031, KYK-1.0, or KYK-2.0.
As 8 anti-DR5 Binding Domain antibodies, 9 anti-Cancer Antigen-Binding Domain antibodies and 14 anti-Effector Cell-Binding Domain antibodies are listed, such specific contemplation encompasses all (8×9×14=) 1,008 combinations of such binding domains.

(693) The invention also encompasses such pharmaceutical compositions that additionally include a second therapeutic antibody (e.g., tumor-specific monoclonal antibody) that is specific for a particular cancer antigen, and a pharmaceutically acceptable carrier.

(694) In a specific embodiment, the term “pharmaceutically acceptable” means approved by a regulatory agency of the Federal or a state government or listed in the U.S. Pharmacopeia or other generally recognized pharmacopeia for use in animals, and more particularly in humans. The term “carrier” refers to a diluent, adjuvant (e.g., Freund's adjuvant (complete and incomplete), excipient, or vehicle with which the therapeutic is administered. Such pharmaceutical carriers can be sterile liquids, such as water and oils, including those of petroleum, animal, vegetable or synthetic origin, such as peanut oil, soybean oil, mineral oil, sesame oil and the like. Water is a preferred carrier when the pharmaceutical composition is administered intravenously. Saline solutions and aqueous dextrose and glycerol solutions can also be employed as liquid carriers, particularly for injectable solutions. Suitable pharmaceutical excipients include starch, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, sodium stearate, glycerol monostearate, talc, sodium chloride, dried skim milk, glycerol, propylene, glycol, water, ethanol and the like. The composition, if desired, can also contain minor amounts of wetting or emulsifying agents, or pH buffering agents. These compositions can take the form of solutions, suspensions, emulsion, tablets, pills, capsules, powders, sustained-release formulations and the like.

(695) Generally, the ingredients of compositions of the invention are supplied either separately or mixed together in unit dosage form, for example, as a dry lyophilized powder or water free concentrate in a hermetically sealed container such as an ampoule or sachette indicating the quantity of active agent. Where the composition is to be administered by infusion, it can be dispensed with an infusion bottle containing sterile pharmaceutical grade water or saline. Where the composition is administered by injection, an ampoule of sterile water for injection or saline can be provided so that the ingredients may be mixed prior to administration.

(696) The compositions of the invention can be formulated as neutral or salt forms. Pharmaceutically acceptable salts include, but are not limited to those formed with anions such as those derived from hydrochloric, phosphoric, acetic, oxalic, tartaric acids, etc., and those formed with cations such as those derived from sodium, potassium, ammonium, calcium, ferric hydroxides, isopropylamine, triethylamine, 2-ethylamino ethanol, histidine, procaine, etc.

(697) The invention also provides a pharmaceutical pack or kit comprising one or more containers filled with a Tri-Specific Binding Molecule of the present invention (and more preferably, any of the specific binding molecules discussed or exemplified above). Additionally, one or more other prophylactic or therapeutic agents useful for the treatment of a disease can also be included in the pharmaceutical pack or kit. The invention also provides a pharmaceutical pack or kit comprising one or more containers filled with one or more of the ingredients of the pharmaceutical compositions of the invention. Optionally associated with such container(s) can be a notice in the form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceuticals or biological products, which notice reflects approval by the agency of manufacture, use or sale for human administration.

(698) The present invention provides kits that can be used in the above methods. A kit can comprise any of the Tri-Specific Binding Molecules of the present invention. The kit can further comprise one or more other prophylactic and/or therapeutic agents useful for the treatment of cancer, in one or more containers; and/or the kit can further comprise one or more cytotoxic antibodies that bind one or more cancer antigens associated with cancer. In certain embodiments, the other prophylactic or therapeutic agent is a chemotherapeutic. In other embodiments, the prophylactic or therapeutic agent is a biological or hormonal therapeutic.

VIII. Methods of Administration

(699) The compositions of the present invention may be provided for the treatment, prophylaxis, and amelioration of one or more symptoms associated with a disease, disorder or infection by administering to a subject an effective amount of a fusion protein or a conjugated molecule of the invention, or a pharmaceutical composition comprising a fusion protein or a conjugated molecule of the invention. In a preferred aspect, such compositions are substantially purified (i.e., substantially free from substances that limit its effect or produce undesired side effects). In a specific embodiment, the subject is an animal, preferably a mammal such as non-primate (e.g., bovine, equine, feline, canine, rodent, etc.) or a primate (e.g., monkey such as, a cynomolgus monkey, human, etc.). In a preferred embodiment, the subject is a human.

(700) Various delivery systems are known and can be used to administer the compositions of the invention, e.g., encapsulation in liposomes, microparticles, microcapsules, recombinant cells capable of expressing the antibody or fusion protein, receptor-mediated endocytosis (See, e.g., Wu et al. (1987) “Receptor-Mediated In Vitro Gene Transformation By A Soluble DNA Carrier System,” J. Biol. Chem. 262:4429-4432), construction of a nucleic acid as part of a retroviral or other vector, etc.

(701) Methods of administering a molecule of the invention include, but are not limited to, parenteral administration (e.g., intradermal, intramuscular, intraperitoneal, intravenous and subcutaneous), epidural, and mucosal (e.g., intranasal and oral routes). In a specific embodiment, the Tri-Specific Binding Molecules of the present invention are administered intramuscularly, intravenously, or subcutaneously. The compositions may be administered by any convenient route, for example, by infusion or bolus injection, by absorption through epithelial or mucocutaneous linings (e.g., oral mucosa, rectal and intestinal mucosa, etc.) and may be administered together with other biologically active agents. Administration can be systemic or local. In addition, pulmonary administration can also be employed, e.g., by use of an inhaler or nebulizer, and formulation with an aerosolizing agent. See, e.g., U.S. Pat. Nos. 6,019,968; 5,985,320; 5,985,309; 5,934,272; 5,874,064; 5,855,913; 5,290,540; and 4,880,078; and PCT Publication Nos. WO 92/19244; WO 97/32572; WO 97/44013; WO 98/31346; and WO 99/66903, each of which is incorporated herein by reference in its entirety.

(702) The invention also provides that the Tri-Specific Binding Molecules of the present invention are packaged in a hermetically sealed container such as an ampoule or sachette indicating the quantity of the molecule. In one embodiment, such molecules are supplied as a dry sterilized lyophilized powder or water free concentrate in a hermetically sealed container and can be reconstituted, e.g., with water or saline to the appropriate concentration for administration to a subject. Preferably, the Tri-Specific Binding Molecules of the present invention are supplied as a dry sterile lyophilized powder in a hermetically sealed container at a unit dosage of at least 5 μg, more preferably at least 10 μg, at least 15 μg, at least 25 μg, at least 50 μg, at least 100 μg, or at least 200 μg.

(703) The lyophilized Tri-Specific Binding Molecules of the present invention should be stored at between 2 and 8° C. in their original container and the molecules should be administered within 12 hours, preferably within 6 hours, within 5 hours, within 3 hours, or within 1 hour after being reconstituted. In an alternative embodiment, such molecules are supplied in liquid form in a hermetically sealed container indicating the quantity and concentration of the molecule, fusion protein, or conjugated molecule. Preferably, such Tri-Specific Binding Molecules when provided in liquid form are supplied in a hermetically sealed container in which the molecules are present at a concentration of least 1 μg/ml, more preferably at least 2.5 μg/ml, at least 5 μg/ml, at least 10 μg/ml, at least 50 μg/ml, or at least 100 μg/ml.

(704) The amount of the composition of the invention which will be effective in the treatment, prevention or amelioration of one or more symptoms associated with a disorder can be determined by standard clinical techniques. The precise dose to be employed in the formulation will also depend on the route of administration, and the seriousness of the condition, and should be decided according to the judgment of the practitioner and each patient's circumstances. Effective doses may be extrapolated from dose-response curves derived from in vitro or animal model test systems.

(705) For the Tri-Specific Binding Molecules monovalent diabodies encompassed by the invention, the dosage administered to a patient is preferably determined based upon the body weight (kg) of the recipient subject. The dosage administered is typically from at least about 0.3 ng/kg per day to about 0.9 ng/kg per day, from at least about 1 ng/kg per day to about 3 ng/kg per day, from at least about 3 ng/kg per day to about 9 ng/kg per day, from at least about 10 ng/kg per day to about 30 ng/kg per day, from at least about 30 ng/kg per day to about 90 ng/kg per day, from at least about 100 ng/kg per day to about 300 ng/kg per day, from at least about 200 ng/kg per day to about 600 ng/kg per day, from at least about 300 ng/kg per day to about 900 ng/kg per day, from at least about 400 ng/kg per day to about 800 ng/kg per day, from at least about 500 ng/kg per day to about 1000 ng/kg per day, from at least about 600 ng/kg per day to about 1000 ng/kg per day, from at least about 700 ng/kg per day to about 1000 ng/kg per day, from at least about 800 ng/kg per day to about 1000 ng/kg per day, from at least about 900 ng/kg per day to about 1000 ng/kg per day, or at least about 1,000 ng/kg per day.

(706) In another embodiment, the patient is administered a treatment regimen comprising one or more doses of such prophylactically or therapeutically effective amount of a Tri-Specific Binding Molecule of the present invention, wherein the treatment regimen is administered over 2 days, 3 days, 4 days, 5 days, 6 days or 7 days. In certain embodiments, the treatment regimen comprises intermittently administering doses of the prophylactically or therapeutically effective amount of the Tri-Specific Binding Molecules of the present invention (for example, administering a dose on day 1, day 2, day 3 and day 4 of a given week and not administering doses of the prophylactically or therapeutically effective amount of the Tri-Specific Binding Molecule

(707) Especially encompassed is the administration of such Tri-Specific Binding Molecules that comprise any of the specific combinations of DR5 Binding Domains, Cancer Antigen-Binding Domains and Effector Cell-Binding Domains discussed above, on day 5, day 6 and day 7 of the same week). Typically, there are 1, 2, 3, 4, 5 or more courses of treatment. Each course may be the same regimen or a different regimen.

(708) In another embodiment, the administered dose escalates over the first quarter, first half or first two-thirds or three-quarters of the regimen(s) (e.g., over the first, second, or third regimens of a 4 course treatment) until the daily prophylactically or therapeutically effective amount of the Tri-Specific Binding Molecule is achieved. Table 3 provides 5 examples of different dosing regimens described above for a typical course of treatment.

(709) TABLE-US-00227 TABLE 3 Diabody Dosage (ng diabody per kg Regimen Day subject weight per day) 1 1, 2, 3, 4 100 100 100 100  100 5, 6, 7 none none none none none 2 1, 2, 3, 4 300 500 700 900 1,000 5, 6, 7 none none none none none 3 1, 2, 3, 4 300 500 700 900 1,000 5, 6, 7 none none none none none 4 1, 2, 3, 4 300 500 700 900 1,000 5, 6, 7 none none none none none

(710) The dosage and frequency of administration of a Tri-Specific Binding Molecule of the present invention may be reduced or altered by enhancing uptake and tissue penetration of the molecule by modifications such as, for example, lipidation.

(711) The dosage of a Tri-Specific Binding Molecule of the invention administered to a patient may be calculated for use as a single agent therapy. Alternatively, the molecule may be used in combination with other therapeutic compositions and the dosage administered to a patient are lower than when said molecules are used as a single agent therapy.

(712) The pharmaceutical compositions of the invention may be administered locally to the area in need of treatment; this may be achieved by, for example, and not by way of limitation, local infusion, by injection, or by means of an implant, said implant being of a porous, non-porous, or gelatinous material, including membranes, such as sialastic membranes, or fibers. Preferably, when administering a molecule of the invention, care must be taken to use materials to which the molecule does not absorb.

(713) The compositions of the invention can be delivered in a vesicle, in particular a liposome (See Langer (1990) “New Methods Of Drug Delivery,” Science 249:1527-1533); Treat et al., in LIPOSOMES IN THE THERAPY OF INFECTIOUS DISEASE AND CANCER, Lopez-Berestein and Fidler (eds.), Liss, New York, pp. 353-365 (1989); Lopez-Berestein, ibid., pp. 317-327).

(714) The compositions of the invention can be delivered in a controlled-release or sustained-release system. Any technique known to one of skill in the art can be used to produce sustained-release formulations comprising one or more of the Tri-Specific Binding Molecule(s) of the invention. See, e.g., U.S. Pat. No. 4,526,938; PCT publication WO 91/05548; PCT publication WO 96/20698; Ning et al. (1996) “Intratumoral Radioimmunotheraphy Of A Human Colon Cancer Xenograft Using A Sustained-Release Gel,” Radiotherapy & Oncology 39:179-189, Song et al. (1995) “Antibody Mediated Lung Targeting Of Long-Circulating Emulsions,” PDA Journal of Pharmaceutical Science & Technology 50:372-397; Cleek et al. (1997) “Biodegradable Polymeric Carriers For A bFGF Antibody For Cardiovascular Application,” Pro. Int'l. Symp. Control. Rel. Bioact. Mater. 24:853-854; and Lam et al. (1997) “Microencapsulation Of Recombinant Humanized Monoclonal Antibody For Local Delivery,” Proc. Int'l. Symp. Control Rel. Bioact. Mater. 24:759-760, each of which is incorporated herein by reference in its entirety. In one embodiment, a pump may be used in a controlled-release system (See Langer, supra; Sefton, (1987) “Implantable Pumps,” CRC Crit. Rev. Biomed. Eng. 14:201-240; Buchwald et al. (1980) “Long-Term, Continuous Intravenous Heparin Administration By An Implantable Infusion Pump In Ambulatory Patients With Recurrent Venous Thrombosis,” Surgery 88:507-516; and Saudek et al. (1989) “A Preliminary Trial Of The Programmable Implantable Medication System For Insulin Delivery,” N. Engl. J. Med. 321:574-579). In another embodiment, polymeric materials can be used to achieve controlled-release of the molecules (see e.g., MEDICAL APPLICATIONS OF CONTROLLED RELEASE, Langer and Wise (eds.), CRC Pres., Boca Raton, Fla. (1974); CONTROLLED DRUG BIOAVAILABILITY, DRUG PRODUCT DESIGN AND PERFORMANCE, Smolen and Ball (eds.), Wiley, New York (1984); Levy et al. (1985) “Inhibition Of Calcification Of Bioprosthetic Heart Valves By Local Controlled-Release Diphosphonate,” Science 228:190-192; During et al. (1989) “Controlled Release Of Dopamine From A Polymeric Brain Implant: In Vivo Characterization,” Ann. Neurol. 25:351-356; Howard et al. (1989) “Intracerebral Drug Delivery In Rats With Lesion Induced Memory Deficits,” J. Neurosurg. 7(1):105-112); U.S. Pat. Nos. 5,679,377; 5,916,597; 5,912,015; 5,989,463; 5,128,326; PCT Publication No. WO 99/15154; and PCT Publication No. WO 99/20253). Examples of polymers used in sustained-release formulations include, but are not limited to, poly(-hydroxy ethyl methacrylate), poly(methyl methacrylate), poly(acrylic acid), poly(ethylene-co-vinyl acetate), poly(methacrylic acid), polyglycolides (PLG), polyanhydrides, poly(N-vinyl pyrrolidone), poly(vinyl alcohol), polyacrylamide, poly(ethylene glycol), polylactides (PLA), poly(lactide-co-glycolides) (PLGA), and polyorthoesters. A controlled-release system can be placed in proximity of the therapeutic target (e.g., the lungs), thus requiring only a fraction of the systemic dose (see, e.g., Goodson, in MEDICAL APPLICATIONS OF CONTROLLED RELEASE, supra, vol. 2, pp. 115-138 (1984)). Polymeric compositions useful as controlled-release implants can be used according to Dunn et al. (See U.S. Pat. No. 5,945,155). This particular method is based upon the therapeutic effect of the in situ controlled-release of the bioactive material from the polymer system. The implantation can generally occur anywhere within the body of the patient in need of therapeutic treatment. A non-polymeric sustained delivery system can be used, whereby a non-polymeric implant in the body of the subject is used as a drug delivery system. Upon implantation in the body, the organic solvent of the implant will dissipate, disperse, or leach from the composition into surrounding tissue fluid, and the non-polymeric material will gradually coagulate or precipitate to form a solid, microporous matrix (See U.S. Pat. No. 5,888,533).

(715) Controlled-release systems are discussed in the review by Langer (1990, “New Methods Of Drug Delivery,” Science 249:1527-1533). Any technique known to one of skill in the art can be used to produce sustained-release formulations comprising one or more therapeutic agents of the invention. See, e.g., U.S. Pat. No. 4,526,938; International Publication Nos. WO 91/05548 and WO 96/20698; Ning et al. (1996) “Intratumoral Radioimmunotheraphy Of A Human Colon Cancer Xenograft Using A Sustained-Release Gel,” Radiotherapy & Oncology 39:179-189, Song et al. (1995) “Antibody Mediated Lung Targeting Of Long-Circulating Emulsions,” PDA Journal of Pharmaceutical Science & Technology 50:372-397; Cleek et al. (1997) “Biodegradable Polymeric Carriers For A bFGF Antibody For Cardiovascular Application,” Pro. Int'l. Symp. Control. Rel. Bioact. Mater. 24:853-854; and Lam et al. (1997) “Microencapsulation Of Recombinant Humanized Monoclonal Antibody For Local Delivery,” Proc. Int'l. Symp. Control Rel. Bioact. Mater. 24:759-760, each of which is incorporated herein by reference in its entirety.

(716) Where the composition of the invention is a nucleic acid encoding a Tri-Specific Binding Molecule of the present invention, the nucleic acid can be administered in vivo to promote expression of its encoded Tri-Specific Binding Molecule by constructing it as part of an appropriate nucleic acid expression vector and administering it so that it becomes intracellular, e.g., by use of a retroviral vector (See U.S. Pat. No. 4,980,286), or by direct injection, or by use of microparticle bombardment (e.g., a gene gun; Biolistic, Dupont), or coating with lipids or cell surface receptors or transfecting agents, or by administering it in linkage to a homeobox-like peptide which is known to enter the nucleus (See e.g., Joliot et al. (1991) “Antennapedia Homeobox Peptide Regulates Neural Morphogenesis,” Proc. Natl. Acad. Sci. (U.S.A.) 88:1864-1868), etc. Alternatively, a nucleic acid can be introduced intracellularly and incorporated within host cell DNA for expression by homologous recombination.

(717) Treatment of a subject with a therapeutically or prophylactically effective amount of a Tri-Specific Binding Molecule of the present invention can include a single treatment or, preferably, can include a series of treatments. In a preferred example, a subject is treated with such a diabody one time per week for between about 1 to 10 weeks, preferably between 2 to 8 weeks, more preferably between about 3 to 7 weeks, and even more preferably for about 4, 5, or 6 weeks. The pharmaceutical compositions of the invention can be administered once a day, twice a day, or three times a day. Alternatively, the pharmaceutical compositions can be administered once a week, twice a week, once every two weeks, once a month, once every six weeks, once every two months, twice a year or once per year. It will also be appreciated that the effective dosage of the molecules used for treatment may increase or decrease over the course of a particular treatment.

EXAMPLES

(718) Having now generally described the invention, the same will be more readily understood through reference to the following examples, which are provided by way of illustration and are not intended to be limiting of the present invention unless specified. It will be apparent to those skilled in the art that many modifications, both to materials and methods, can be practiced without departing from the scope of the present disclosure.

W. Example 1: Characterization of Anti-Human DR5 Monoclonal Antibodies DR5 mAb 1 and DR5 mAb 2

(719) Two monoclonal antibodies were isolated as being capable of immunospecifically binding to human DR5, and accorded the designations “DR5 mAb 1” and “DR5 mAb 2”. As discussed above, the CDRs of these antibodies were found to differ. In order to determine whether the antibodies bound to different DR5 epitopes, a human DR5-Fc fusion protein was prepared and was coated to an immobilized surface. DR5 mAb 1 (1 μg/mL) was biotinylated and incubated with either a control IgG or with DR5 mAb 2 (10 μg/mL), and the ability of the IgG or DR5 mAb 2 antibody to compete for binding (to human DR5-Fc fusion protein) with DR5 mAb 1 was assessed by measuring the amount of immobilized biotinylated antibody. Additionally, the ability of the IgG or DR5 mAb 1 antibody to compete for binding with biotinylated DR5 mAb 2 was assessed. The results of this experiment are shown in Table 4.

(720) TABLE-US-00228 TABLE 4 10 μg/mL Competitor mAb 1 μg/mL DR5-Fc DR5 DR5 Fusion coat mIgG mAb 1 mAb 2 DR5 mAb 1 2.162 self 0.826 1 μg/mL DR5 mAb 2 2.102 2.377 self biotinylated DR5 mAb

(721) The results of this experiment indicate that the biotinylated antibody was capable of binding to the DR5 protein even in the presence of excess amounts of the non-biotinylated antibody. Thus, the results show that DR5 mAb 1 and DR5 mAb 2 bind to different epitopes of DR5.

(722) In order to further characterize the DR5 mAb 1 and DR mAb 2 antibodies, their ability to block binding between DR5 and the TRAIL ligand as assessed. Thus, biotinylated DR5 mAb 1, biotinylated DR5 mAb 2 or biotinylated DR5-Fc fusion (each at 2 μg/mL) were separately incubated with immobilized DR5-Fc fusion (1 μg/mL) in the presence of either buffer or histidine tagged TRAIL (20 μg/mL). The amount of immobilized biotinylated antibody was assessed. The results of this experiment are shown in Table 5.

(723) TABLE-US-00229 TABLE 5 2 μg/mL 1 μg/mL DR5-Fc fusion coat Biotinylated 20 μg/mL 1 μg/mL TRAIL- DR5 mAb TRAIL-His Buffer His coat DR5 mAb 1 1.939 2.118 0.007 DR5 mAb 2 2.052 2.052 0.008 DR5-Fc fusion — — 0.288

(724) The results show that the amount of DR5 mAb 1 or DR5 mAb 2 bound to the immobilized DR5-Fc was not affected by the presence of the histidine tagged TRAIL, thus indicating that neither DR5 mAb 1 nor DR5 mAb 2 block the TRAIL ligand binding site of DR5. Additionally, neither antibody was capable of binding to the histidine tagged TRAIL ligand.

X. Example 2: Species Specificity of Anti-Human DR5 Monoclonal Antibodies DR5 mAb 1 and DR5 mAb 2

(725) In order to assess the species specificity of anti-human DR5 monoclonal antibodies DR5 mAb 1 and DR5 mAb 2, the ability of the antibodies to bind to human DR5 was compared with their ability to bind cynomolgus monkey (Macaca fascicularis) DR5. The results of this experiment are shown in FIG. 6. The results show that both antibodies are capable of binding to cynomolgus monkey DR5, but that they each exhibit higher binding affinity for human DR5.

(726) The kinetics of binding was investigated using Biacore Analysis, as shown in FIG. 7. Bi-specific DR5×CD3 diabodies were incubated with His-tagged DR5 and the kinetics of binding was determined via Biacore analysis. The diabodies employed were DR5 mAb 1×CD3 mAb 2 (FIG. 7, Panels A and E), DR5 mAb 2×CD3 mAb 2 (FIG. 7, Panels B and F), DR5 mAb 3×CD3 mAb 2 (FIG. 7, Panels C and G), and DR5 mAb 4×CD3 mAb 2 (FIG. 7, Panels D and H). FIG. 7, Panels A-D show the results for human DR5. FIG. 7, Panels E-H show the results for cynomolgus monkey DR5. The calculated ka, kd and KD are presented in Table 6.

(727) TABLE-US-00230 TABLE 6 Human Cynomolgus Monkey Anti-DR KD KD Antibody ka kd (nM) ka kd (nM) DR mAb 1 8.5 × 10.sup.6 1.2 × 10.sup.−3 0.14 4.0 × 10.sup.6 1.3 × 10.sup.−1 32.5 DR mAb 2 3.4 × 10.sup.5 2.1 × 10.sup.−4 0.62 2.4 × 10.sup.5 1.0 × 10.sup.−4 0.42 DR mAb 3 4.2 × 10.sup.6 3.7 × 10.sup.−2  8.8 3.3 × 10.sup.6 4.4 × 10.sup.−2 13.3 DR mAb 4 5.4 × 10.sup.6 1.7 × 10.sup.−2  3.2 2.5 × 10.sup.6 4.1 × 10.sup.−2 16.4

(728) The results demonstrate that DR5 mAb 1 and DR5 mAb 2 exhibit altered kinetics of binding relative to reference antibodies DR5 mAb 3 and DR5 mAb 4.

Y. Example 3: Unexpected Superiority of DR5 mAb 1 and DR5 mAb 2

(729) The ability of DR5-binding molecules DR5 mAb 1 and DR5 mAb 2 of the present invention to mediate cytotoxicity was compared with that of the reference anti-DR5 antibodies: DR5 mAb 3 and DR5 mAb 4. In order to make such a comparison, a bi-specific DR5×CD3 diabody containing the VL and VH Domains of these antibodies and the VL and VH Domains of CD3 mAb 2 were prepared. The prepared diabodies were: DR5 mAb 1×CD3 mAb 2; DR5 mAb 2×CD3 mAb 2; DR5 mAb 3×CD3 mAb 2; and DR5 mAb 4×CD3 mAb 2.

(730) The employed control diabody contained the VL and VH domains of anti-fluorescein antibody 4-4-20 (respectively, SEQ ID NOs:138 and 139) and the VL and VH domains of CD3 mAb 2 (respectively, SEQ ID NOs:102 and 108), and was designated as the anti-fluorescein×anti-CD3 control diabody “4-4-20×CD3 mAb 2.” The diabody was composed of two polypeptide chains. The first polypeptide chain of the diabody had the amino acid sequence (SEQ ID NO:300) (CDRs are shown in underline):

(731) TABLE-US-00231 DVVMTQTPFS LPVSLGDQAS ISCRSSQSLV HSNGNTYLRW YLQKPGQSPK VLIYKVSNRF SGVPDRFSGS GSGTDFTLKI SRVEAEDLGV YFCSQSTHVP WTFGGGTKLE IKGGGSGGGG EVQLVESGGG LVQPGGSLRL SCAASGFTFN TYAMNWVRQA PGKGLEWVAR IRSKYNNYAT YYADSVKDRF TISRDDSKNS LYLQMNSLKT EDTAVYYCVR HGNFGNSYVS WFAYWGQGTL VTVSSGGCGG GEVAALEKEV AALEKEVAAL EKEVAALEK

(732) In SEQ ID NO:300, amino acid residues 1-112 correspond to the VL Domain of anti-fluorescein antibody 4-4-20 (SEQ ID NO:138), residues 113-120 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 121-245 correspond to the VH Domain of CD3 mAb 2 (SEQ ID NO:108), residues 246-251 are a cysteine-containing spacer peptide (GGCGGG) (SEQ ID NO:34), and residues 252-280 correspond to an E-coil Domain (SEQ ID NO:39).

(733) The second polypeptide chain of the diabody had the amino acid sequence (SEQ ID NO:301) (CDRs are shown in underline):

(734) TABLE-US-00232 QAVVTQEPSL TVSPGGTVTL TCRSSTGAVT TSNYANWVQQ KPGQAPRGLI GGTNKRAPWT PARFSGSLLG GKAALTITGA QAEDEADYYC ALWYSNLWVF GGGTKLTVLG GGGSGGGGEV KLDETGGGLV QPGRPMKLSC VASGFTFSDY WMNWVRQSPE KGLEWVAQIR NKPYNYETYY SDSVKGRFTI SRDDSKSSVY LQMNNLRVED MGIYYCTGSY YGMDYWGQGT SVTVSSGGCG GGKVAALKEK VAALKEKVAA LKEKVAALKE

(735) In SEQ ID NO:301, amino acid residues 1-110 correspond to the VL Domain of CD3 mAb 2 (SEQ ID NO:104), residues 111-118 correspond to the intervening spacer peptide GGGSGGGG (Linker 1) (SEQ ID NO:33), residues 119-236 correspond to the VH Domain of anti-fluorescein antibody 4-4-20 (SEQ ID NO:139), residues 237-242 are a cysteine-containing spacer peptide (GGCGGG) (SEQ ID NO:34), and residues 243-270 correspond to a K-coil Domain (SEQ ID NO:40).

(736) Target tumor cells were incubated with one of these diabodies or with the control diabody (4-4-20×CD3 mAb 2) in the presence of peripheral blood mononuclear cells (PBMC) and A549 adenocarcinomic human alveolar basal epithelial cells for 24 hours at an effector to target cell ratio of 20:1. The percentage cytotoxicity was determined by measuring the release of lactate dehydrogenase (LDH) into the media by damaged cells.

(737) The results of this investigation are shown in FIG. 8. Similar results were obtained using SKMES human lung cancer cells, DU145 human prostate cancer cells, A375 human malignant melanoma cells, SKBR3 human HER2-overexpressing breast carcinoma cells, and JIMT human breast carcinoma cells. The results indicate that the VL and VH domains of DR5 mAb 1 and DR5 mAb 2 are significantly and unexpectedly more potent in inducing cytotoxicity than those of the reference DR5 mAbs.

Z. Example 4: The Trispecific Binding Molecules Mediate Coordinated and Simultaneous Binding to Target Cells

(738) The ability of Tri-Specific Binding Molecules of the present invention to bind to target cells was investigated. The employed trispecific molecules were: EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1; EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1; and gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1. As shown in FIG. 9A, those Tri-Specific Binding Molecules that comprise an EphA2 Cancer Antigen-Binding Domain were found to be capable of binding to EphA2-expressing CHO target cells. As shown in FIG. 9B, those Tri-Specific Binding Molecules that comprise a DR5 Cancer Antigen-Binding Domain were found to be capable of binding to DR5-expressing CHO target cells. As shown in FIG. 9C, those Tri-Specific Binding Molecules that comprise an EphA2 Cancer Antigen-Binding or a DR5 Cancer Binding Domain were found to be capable of binding to DU145 cells. DU145 cells are a human prostate cell line that express both EphA2 and DR5, but not gpA33. The above-described reference gpA33 mAb 1×CD3 mAb 2 diabody was used as a control.

(739) Significantly, the data show that when both of the two Cancer Antigen-Binding Domains of a Tri-Specific Binding Molecule of the present invention are able to bind to a target cell, such dual binding is associated with a synergistic (e.g., a 5-25 fold) enhancement in target binding.

AA. Example 5: The Trispecific Binding Molecules Mediate Cytotoxicity of Bound Target Cells

(740) The ability of Tri-Specific Binding Molecules of the present invention to mediate the cytotoxicity of bound target cells in the presence of cytotoxic lymphocytes was investigated. The employed trispecific molecules were: EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1; EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1; and gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1. The above-described reference gpA33 mAb 1×CD3 mAb 2 diabody and the 4-4-20×CD3 mAb 2 diabody were used as controls.

(741) As shown in FIG. 10A, those Tri-Specific Binding Molecules that comprise an EphA2 Cancer Antigen-Binding Domain, and thus were able to bind to bind to EphA2-expressing CHO cells, were able to mediate the cytotoxicity of such cells in the presence of the cytotoxic lymphocytes. As shown in FIG. 10B, those Tri-Specific Binding Molecules that comprise a DR5 Cancer Antigen-Binding Domain, and thus were able to bind to bind to DR5-expressing CHO cells, were found to be capable of mediating cytotoxicity of DR5-expressing CHO target cells in the presence of the cytotoxic lymphocytes.

(742) As shown in FIG. 10C, those Tri-Specific Binding Molecules that comprise an EphA2 Cancer Antigen-Binding or a DR5 Cancer Binding Domain, and thus are capable of binding to DU145 cells, were able to mediate the cytotoxicity of such cells in the presence of the cytotoxic lymphocytes. Significantly, the data show that when both of the two Cancer Antigen-Binding Domains of a Tri-Specific Binding Molecule of the present invention are able to bind to a target cell, such dual binding is associated with a synergistic enhancement in target binding. Thus, EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1, which is capable of binding to both EphA2 and DR5, mediated substantially greater cytotoxicity than EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1 or gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1, which were capable of binding to only EphA2 or DR5 molecules of the DU146 cells (since such cells lack gpA33).

(743) In this regard, at approximately the EC50 of EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1, no cytotoxic lymphocyte response is seen for either EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1 or gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1. At approximately the EC90 of EphA2 mAb 1×CD3 mAb 2×DR5 mAb 1, EphA2 mAb 1×CD3 mAb 2×gpA33 mAb 1 shows only an EC15, and gpA33 mAb 1×CD3 mAb 2×DR5 mAb 1 shows no cytotoxic lymphocyte response at all.

(744) All publications and patents mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference in its entirety. While the invention has been described in connection with specific embodiments thereof, it will be understood that it is capable of further modifications and this application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains and as may be applied to the essential features hereinbefore set forth.