Reaction catalyzed by anthocyanidin 3-O-glucoside 5-O-glucosyltransferase (2.4.1.298)

		+			=			+
	UDP-alpha-D-glucose	+		delphinidin 3-O-beta-D-glucoside	=		UDP	+		delphinidin 3,5-di-O-beta-D-glucoside