The disclosure relates to an oligosaccharyltransferase polypeptides and their use in the synthesis of glycoconjugates in bacterial cells; vaccines and immunogenic compositions comprising said glycoconjugates and their use in the prevention and/or treatment of bacterial infection. Bacterial expression system comprising said oligosaccharyltransferase polypeptides are also disclosed.

The present invention provides engineered glycosyltransferase (GT) enzymes, polypeptides having GT activity, and polynucleotides encoding these enzymes, as well as vectors and host cells comprising these polynucleotides and polypeptides. The present invention provides engineered sucrose synthase (SuS) enzymes, polypeptides having SuS activity, and polynucleotides encoding these enzymes, as well as vectors and host cells comprising these polynucleotides and polypeptides. The present invention also provides compositions comprising the GT enzymes and methods of using the engineered GT enzymes to make products with -glucose linkages. The present invention further provides compositions and methods for the production of rebaudiosides (e.g., rebaudioside M, rebaudioside A, rebaudioside I, and rebaudioside D). The present invention also provides compositions comprising the SuS enzymes and methods of using them. Methods for producing GT and SuS enzymes are also provided.

The present invention provides novel, recombinant Gram-negative bacteria. In particular, the invention provides recombinant Gram-negative bacteria (e.g., E. coli) lacking genes involved in lipopolysaccharide (LPS, endotoxin) biosynthesis (e.g., lacking genes required for core oligosaccharide biosynthesis) and also provides recombinant Gram-negative bacteria lacking genes involved in LPS biosynthesis that contain one or more exogenous KDO transferases and/or one or more exogenous heptosyltransferases (e.g., from one or more types and/or strains of bacteria). The invention further provides methods of generating and utilizing (e.g., as or in an immunogenic composition (e.g., as or in an adjuvant and/or vaccine)) the recombinant Gram-negative bacteria therapeutic, preventative, and/or research applications.

The present invention relates to a novel Lactobacillus strain that is not attacked by common phages and a novel Lactobacillus strain with improved cell count stability, its use in the manufacture of fermented milk-based products, and novel milk based products containing the strain.

Provided herein are glycosylated ComP proteins, fragments and fusion proteins thereof, and methods of making, for example, for use in the production of conjugate vaccines. Also provided herein are conjugate vaccines against diseases including bacterial diseases.

This disclosure is in the technical field of synthetic biology and metabolic engineering. More particularly, this disclosure is in the technical field of cultivation of metabolically engineered cells. This disclosure describes a method for the production of a glycosylated product derived from UDP-GlcNAc and comprising a di- or oligosaccharide that is composed of at least two different monosaccharide subunits by a cell as well as the separation of the glycosylated product from the cultivation. Furthermore, this disclosure provides a metabolically engineered cell for production of a glycosylated product derived from UDP-GlcNAc and comprising a di- or oligosaccharide that is composed of at least two different monosaccharide subunits. This disclosure also provides a cell excreting a di- or oligosaccharide out of the cell.

The present invention provides engineered glycosyltransferase (GT) enzymes, polypeptides having GT activity, and polynucleotides encoding these enzymes, as well as vectors and host cells comprising these polynucleotides and polypeptides. The present invention provides engineered sucrose synthase (SuS) enzymes, polypeptides having SuS activity, and polynucleotides encoding these enzymes, as well as vectors and host cells comprising these polynucleotides and polypeptides. The present invention also provides compositions comprising the GT enzymes and methods of using the engineered GT enzymes to make products with -glucose linkages. The present invention further provides compositions and methods for the production of rebaudiosides (e.g., rebaudioside M, rebaudioside A, rebaudioside I, and rebaudioside D). The present invention also provides compositions comprising the SuS enzymes and methods of using them. Methods for producing GT and SuS enzymes are also provided.

Disclosed are components, systems, and methods for glycoprotein or recombinant glycoprotein protein synthesis in vitro and in vivo. In particular, the present invention relates to components, systems, and methods for identifying amino acid glycosylation tag motifs for N-glycosyltransferases and the use of the identified amino acid glycosylation tag motifs in methods for preparing glycoproteins and recombinant glycoproteins in vitro and in vivo.

The present invention relates to the isolation and purification of sialylated oligosaccharides from an aqueous medium in which they are produced.

Disclosed are novel glycosylated psilocybin derivative compounds and pharmaceutical and recreational drug formulations containing the same. The compounds may be produced by reacting a hydroxylated psilocybin derivative with a glycosyl compound.