Enzymes that catalyze the transfer of glycosyl (sugar) residues to an acceptor, both during degradation (cosubstrates= water or inorganic phosphate) and during biosynthesis of polysaccharides, glycoproteins and glycolipids. In biosynthetic glycosyl transfers, the common activated monomeric sugar intermediate is a nucleoside diphosphate sugar.
A reference proteome is a set of protein sequences derived from a complete proteome which constitutes a defined standard for a particular user community. Reference proteomes are manually defined according to a number of criteria. They cover the proteomes of well- studied model organisms and other proteomes of interest for biomedical and biotechnological research. Reference proteomes have been selected to provide broad coverage of the tree of life, and constitute a representative cross-section of the taxonomic diversity to be found within UniProtKB.
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