Reaction catalyzed by alpha-mannosidase (3.2.1.24), mannosyl-oligosaccharide 1,2-alpha-mannosidase (3.2.1.113)
+
4
H2O
=
+
4
Man9GlcNAc2-[protein]
+
4 H2O
=
Man5GlcNAc2-[protein]
+
4 beta-D-mannopyranose