Provided are a bispecific antibody and use thereof. The bispecific antibody comprises a B7-H4-targeting antigen-binding domain and a 4-1BB-targeting antigen-binding domain. The bispecific antibody has one or two or three sites for binding to 4-1BB, along with a novel fully human B7-H4 antibody. The bispecific antibody specifically binds to tumor cells by targeting B7-H4, reducing toxicity induced by 4-1BB activation. In addition, the bispecific antibody of the present invention comprises a human Fc fragment, and thus retains the binding of Fc to FcRn and has a longer half-life.

High-affinity antibodies recognizing CD3 and B Cell Maturation Factor protein (BCMA) are disclosed. Binding sites from humanized anti-CD3 and anti-BCMA antibodies are incorporated into a Fabs-in-Tandem Immunoglobulin format without significant loss of binding affinity, and the resultant bispecific, multivalent binding proteins are able to bind to both CD3 and BCMA simultaneously. Such antibodies, antigen-binding portions thereof, and bispecific FIT-Ig binding proteins are useful for treating cancer.

Disclosed are antigen binding polypeptides and antigen binding polypeptide complexes (e.g., antibodies and antigen binding fragments thereof) having certain structural features. Also disclosed are polynucleotides and vectors encoding such polypeptides and polypeptide complexes; chimeric antigen receptors (CARs), cells, pharmaceutical compositions and kits containing such polypeptides and polypeptide complexes; and methods of using such polypeptides and polypeptide complexes.

Antibodies binding to human claudin 18.2 (CLDN 18.2) and bispecific antibodies binding to both human CLDN 18.2 and PD-L1, pharmaceutical compositions comprising such, and methods of using such for treating target diseases such as cancer.

The present invention relates in part to amino acid sequences that are directed against and/or that can specifically bind to an envelope protein of a virus, as well as to compounds or constructs, and in particular proteins and polypeptides, that comprise or essentially consist of one or more such amino acid sequences.

The present invention relates to bispecific antibodies comprising a modified C-terminal crossfab fragment that have reduced or no reactivity against preexisting antidrug antibodies.

The present invention provides a covalent conjugate. The conjugate includes an antibody or antibody derivative, at least two LL37-derived polypeptides, and a payload. The antibody or antibody derivative targets a cell that has phosphatidylserine in its outer leaflet. The payload includes: a small molecule cytotoxic drug of less than 3 kDa, or a plurality thereof; or a peptide or protein of less than 100 kDa. Uses and methods of using these covalent conjugates are also provided, related to enhancing delivery of the antibody/derivative or the payload, e.g. to enhance therapeutic or diagnostic effectiveness.

The present invention relates to the field of virology, more specifically to the field of zoonotic Coronaviruses. Specifically, the invention provides for binding agents specific for the spike protein receptor binding domain (RBD) of the SARS-Corona virus, more specifically for an epitope of the RBD present in a broad range of Sarbecoviruses and mutants thereof, even more specifically present in SARS-Cov and SARS-CoV-2 viruses. More specifically, the invention relates to compositions comprising antibodies capable of specifically binding and neutralizing SARS-Corona viruses. More specifically the invention relates to compositions comprising single domain antibodies, or specifically VHHs, and compositions comprising multivalent binding agents comprising IgG Fc fusions thereof, specifically VHH-Fc fusions thereof, even more specifically comprising heavy chain only VHH72-S56A-IgG1-Fc fusions, or compositions comprising any humanized form of any one thereof, and are capable of specifically binding and neutralizing SARS-Corona viruses, specifically SARS-Cov-2 virus. The compositions are useful in the diagnosis of Sarbecoviruses, and specifically SARS-CoV-2 virus, and in prophylactic and/or therapeutic treatment of a condition resulting from infections with Sarbecoviruses, specifically SARS-Corona or SARS-CoV-2 virus, or mutants thereof.

A transgenic non-human animal is provided. In certain embodiments, the animal comprises a genome comprising an immunoglobulin heavy chain locus comprising: a) a transcribed gene encoding a fusion protein comprising, from N-terminus to C-terminus: i. a scaffold comprising a first binding domain; and ii. a heavy chain constant region operably linked to the scaffold; wherein the scaffold is capable of specifically binding to a target in the absence of additional polypeptides; and b) a plurality of pseudogenes that are operably linked to the transcribed gene and that donate, by gene conversion, nucleotide sequence to the part of the transcribed gene that encodes the binding domain.

The present disclosure relates to an engineered antibody that co-engages a cell type-selective (or specific) antigen (guide) and a signaling receptor (effector) on a target cell. In some instances, the engineered antibody is capable of modulating a signaling pathway on a target cell. In other embodiments, an engineered antibody of the present disclosure is administered to a subject for the treatment of a disease or condition.