The invention relates to microbial host cells engineered to produce glycoconjugate vaccines by stable integration of an acceptor protein and an oligosaccharyltransferase into the host's genome, wherein expression of the oligosaccharyltransferase is regulated.

Compositions are disclosed herein comprising a graft copolymer that comprises: (i) a backbone comprising an alpha-1,3-glucan ether or ester compound, and (ii) one or more alpha-1,3-glucan side chains comprising at least about 50% alpha-1,3 glycosidic linkages. Further disclosed are reactions for producing such graft copolymers, as well as their use in various applications.

The purpose of the present invention is to provide a steviol glycoside hexose transferase, and a method for producing a steviol glycoside that contains glucose and/or rhamnose using said enzyme. The present invention provides a steviol glycoside hexose transferase, and a method for producing a steviol glycoside that contains glucose and/or rhamnose using said enzyme. The present invention also provides a transformant into which a steviol glycoside hexose transferase gene has been introduced, and a method for preparing said transformant.

The present invention relates to a recombinant host comprising a recombinant nucleic acid sequence encoding a polypeptide having at least about: a. 85% identity to the amino acid sequence set forth in SEQ ID NO: 1; b. 85% identity to the amino acid sequence set forth in SEQ ID NO: 3; c. 85% identity to the amino acid sequence set forth in SEQ ID NO: 6; d. 85% identity to the amino acid sequence set forth in SEQ ID NO: 9; e. 85% identity to the amino acid sequence set forth in SEQ ID NO: 11; f. 85% identity to the amino acid sequence set forth in SEQ ID NO: 14; g. 85% identity to the amino acid sequence set forth in SEQ ID NO: 17; h. 85% identity to the amino acid sequence set forth in SEQ ID NO: 20; i. 85% identity to the amino acid sequence set forth in SEQ ID NO: 22; or j. 85% identity to the amino acid sequence set forth in SEQ ID NO: 25.

Disclosed is a steviol glycoside referred to as rebaudioside D2. Rebaudioside D2 has five -D-glucosyl units connected to the aglycone steviol. Also disclosed are methods for producing rebaudioside D2, a UDP-glycosyltransferase fusion enzyme, and methods for producing rebaudioside D and rebaudioside E.

Reaction solutions are disclosed herein comprising water, sucrose and a glucosyltransferase enzyme that synthesizes poly alpha-1,3-glucan. The glucosyltransferase enzyme can synthesize insoluble glucan polymer having at least 50% alpha-1,3 glycosidic linkages and a number average degree of polymerization of at least 100. Further disclosed are methods of using such glucosyltransferase enzymes to produce insoluble poly alpha-1,3-glucan.

The present invention relates to a plant or plant cell being capable to produce polysialylated glycoproteins comprising at least one recombinant nucleic acid sequence operably linked to a promoter, said recombinant nucleic acid sequence encoding for a polypeptide lacking a polysialyltransferase binding motif and comprising at least one glycosylation site.

The present invention relates to engineered carbohydrate-active enzyme constructs that are useful for glycan polymers synthesis. The construct comprises a CD domain from a GH, wherein the domain is conjugated to CBM3a via a peptidic linker. The invention also relates to a method of improving glycan polymer synthesis by using engineered carbohydrate active enzymes comprising a CD domain and CBM3a.

A method for producing an octaketide derived aromatic compound of interest (e.g. carminic acid), wherein the method comprises (I): heterologous expression of a recombinantly introduced Type III polyketide synthase (PKS) gene encoding an octaketide synthase (OKS) to obtain non-reduced octaketide in vivo within the recombinant host cell and (II): converting in vivo the non-reduced octaketide of step (I) into a C.sub.14-C.sub.34 aromatic compound of interest (e.g. carminic acid).

The present invention relates to methods for increasing the diversity of monoclonal antibodies produced against an antigen. The methods of the invention utilize immunization of a murine host defective in one or more enzymes involved in a post-translational modification of a polypeptide or a modification of a lipid, wherein said modification is exposed on a cell surface. The invention also relates to monoclonal antibodies produced by these methods and which are not produced when a normal mouse is immunized with the same antigen. The invention further relates to compositions comprising these monoclonal antibodies, as well as to such monoclonal antibodies bound or conjugated to a toxin, a detectable marker or to a solid support.