Reaction catalyzed by flavonol-3-O-glucoside glucosyltransferase (2.4.1.239)

		+			=			+
	TDP-glucose	+		a flavonol 3-O-beta-D-glucoside	=		TDP	+		a flavonol 3-O-beta-D-glucosyl-(1-2)-beta-D-glucoside