Polysaccharides and glycans are made by the sequential addition of monosaccharides by glycosyltransferase from a reactive sugar - phosphate donor such as
uridine diphosphate glucose (UDP - glucose) to an acceptor hydroxyl group on the growing polysaccharide.
Glucose and inositol are oxidized in the liver to glucuronic acid and then bound into
uridine diphosphate glucuronate (UDG), which is used by the enzyme
uridine diphosphate transglucuronylase to convert 2 - OH estrone, 4 - OH estrone, 16α - OH estrone, estradiol or estriol into water - soluble glucuronides, which can be excreted through the urine as well as bile.
Platelet - associated galactosyltransferase produces efficient galactosylation when
uridine diphosphate — galactose is added, affording a potentially simple method for storing platelets in the cold.