Anthocyanidin 3-O-glucosyltransferase () is an enzyme that catalyzes the general chemical reaction
UDP-D-glucose + an anthocyanidin UDP + an anthocyanidin-3-O-beta-D-glucoside
The two substrates of this enzyme are UDP-D-glucose and an anthocyanidin. Its products are uridine diphosphate (UDP) and the corresponding anthocyanidin-3-O-beta-D-glucoside. For example, the enzyme converts delphinidin to myrtillin by adding the glucose unit to the hydroxyl group at the 3-position of the starting material. The enzyme has been characterised from Silene dioica and Vitis vinifera.
This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-D-glucose:anthocyanidin 3-O-beta-D-glucosyltransferase. Other names in common use include uridine diphosphoglucose-anthocyanidin 3-O-glucosyltransferase, UDP-glucose:anthocyanidin/flavonol 3-O-glucosyltransferase, UDP-glucose:cyanidin-3-O-glucosyltransferase, UDP-glucose:anthocyanidin 3-O-D-glucosyltransferase, and 3-GT. This enzyme participates in flavonoid biosynthesis.
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