Reaction catalyzed by mannosylglycoprotein endo-beta-mannosidase (3.2.1.152)

		+		H2O	=			+
	Man-beta-(1->4)-GlcNAc-beta-(1->4)-GlcNAc-beta-pyridylamine	+		H2O	=		D-mannose	+		GlcNAc-beta-(1->4)-GlcNAc-beta-pyridylamine