Reaction catalyzed by monoglucosyldiacylglycerol synthase (2.4.1.336)

		+			=			+
	UDP-alpha-D-glucose	+		a 1,2-diacyl-sn-glycerol	=		UDP	+		a 1,2-diacyl-3-O-(beta-D-glucopyranosyl)-sn-glycerol