Flavonol-3-O-glucoside glucosyltransferase
In enzymology, a flavonol-3-O-glucoside glucosyltransferase () is an enzyme that catalyzes the chemical reaction

UDP-glucose + a flavonol 3-O-beta-D-glucoside  UDP + a flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside

Thus, the two substrates of this enzyme are UDP-glucose and flavonol 3-O-beta-D-glucoside, whereas its two products are UDP and flavonol 3-O-beta-D-glucosyl-(1→2)-beta-D-glucoside.

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases.  The systematic name of this enzyme class is 'UDP-glucose:flavonol-3-O-glucoside 2-O-beta-D-glucosyltransferase'''.