Reaction catalyzed by glycoprotein endo-alpha-1,2-mannosidase (3.2.1.130)

		+		H2O	=			+
	GlcMan9GlcNAc2-[protein]	+		H2O	=		Man8GlcNAc2-[protein] (isomer 8A1,2,3B1,2)	+		alpha-D-glucosyl-(1->3)-alpha-D-mannopyranose