Reaction catalyzed by 4-galactosyl-N-acetylglucosaminide 3-alpha-L-fucosyltransferase (2.4.1.152)

		+			=			+
	GDP-fucose	+		methyl beta-D-galactosyl-(1-4)-6-O-methylsulfonyl-N-acetyl-beta-D-glucosamine	=		GDP	+		methyl beta-D-galactosyl-(1-4)-[alpha-D-fucosyl-(1-3)]-6-O-methylsulfonyl-N-acetyl-beta-D-glucosamine