“…In contrast, enzymatic glycosylation has attracted extensive interest because of its exquisite selectivity and mild reaction conditions. 15,16 There are two types of enzymes used for glycosylation: glycosyltransferases and glycosidases. 17,18 Glycosyltransferases catalyze the formation of glycosidic bonds needed to supply an activated sugar donor, such as uridinediphosphate glucose (UDP-G), which constrained its practical application.…”