Reaction catalyzed by 3-O-alpha-D-mannopyranosyl-alpha-D-mannopyranose xylosylphosphotransferase (2.7.8.32)

		+			=			+
	UDP-xylose	+		4-O-alpha-D-mannopyranosyl-alpha-D-mannopyranose	=		UMP	+		4-O-(6-O-alpha-D-xylosylphosphono-alpha-D-mannopyranosyl)-alpha-D-mannopyranose