The present invention relates to the cell-based production of bacterial nonulosonates and their biosynthetic precursors. Specifically, the present invention provides recombinant cells for the production of pseudaminic acid, legionaminic acid, UDP-2,4-diacetamido-2,4,6-trideoxy--L-altropyranose, and UDP-2,4-diacetamido-2,4,6-trideoxy--D-glucopyranose. Methods for producing the sugars are also provided.

Provided herein are perfusion fluids for enzymatically cleaving A-antigens from a donor organ, and methods. uses. associated therewith. In particular, the perfusion fluids comprise two enzymes. GalNAcDeacetylase and Galactosaminidase and the fluids may further comprise a buffered extracellular solution and/or a crowing agent. Furthermore. the compositions described herein were found to have activity at temperatures and ph levels suitable for cell viability.

Provided herein are enzymatic compositions for carbohydrate antigen cleavage, methods, uses, apparatuses and sys-O tems associated therewith. In particular, the composition comprises two enzymes, GalNAcDeacetylase and Galactosaminidase and the el composition may further comprise a crowding agent. Furthermore, the compositions described herein were found to have activity a C) temperatures and pH levels suitable for cell viability.

The present invention relates to the cell-based production of bacterial nonulosonates and their biosynthetic precursors. Specifically, the present invention provides recombinant cells for the production of pseudaminic acid, legionaminic acid, UDP-2,4-diacetamido-2,4,6-trideoxy--L-altropyranose, and UDP-2,4-diacetamido-2,4,6-trideoxy--D-glucopyranose. Methods for producing the sugars are also provided.