Reaction catalyzed by UDP-N-acetylglucosamine-lysosomal-enzyme N-acetylglucosaminephosphotransferase (2.7.8.17)

		+			=			+
	UDP-N-acetyl-D-glucosamine	+		methyl-alpha-D-mannoside	=		UMP	+		N-acetyl-D-glucosamine-phospho-(methyl-alpha-D-mannoside)