enzyme catalyzes only the 2''-O-glucosylation of flavonoid 3-O-glucosideto produce flavonoid 3-O-sophoroside. Both anthocyanidin 3-O-glucosides and flavonol 3-O-glucosides are favorable acceptor substrates of the enzyme, whereas no activity is shown toward C-glucosylflavones such as isovitexin
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molecular docking studies. Residues Thr22/Ser276/Glu360/Gln337/Gln338/Trp334 form a binding pocket and interact with the uridine group of UDP-glucose. Glu277/His352/Ser357 show strong interactions with the diphosphate group
Japanese morning glory dusky mutants displaying reddish-brown or purplish-gray flowers are deficient in a novel glycosylation enzyme for anthocyanin biosynthesis, UDP-glucose:anthocyanidin 3-O-glucoside-2??-O-glucosyltransferase, due to 4-bp insertions in the gene