H2O + N-{alpha-Glc-(1->3)-alpha-Man-(1->2)-alpha-Man-(1->2)-alpha-Man-(1->3)-[alpha-Man-(1->2)-alpha-Man-(1->3)-[alpha-Man-(1->2)-alpha-Man-(1->6)]-alpha-Man-(1->6)]-beta-Man-(1->4)-beta-GlcNAc-(1->4)-beta-GlcNAc}-L-asparaginyl-[protein] = alpha-D-glucosyl-(1->3)-D-mannopyranose + N(4)-{alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->6)]-alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlaNAc-(1->4)-beta-D-GlcNAc}-L-asparaginyl-[protein] (N-glucan mannose isomer 8A1,2,3B1,2) Optimum pH is 6.2. Optimum temperature is 37 degrees Celsius. Highly expressed in the liver and kidney. Expressed at lower levels in muscle, pancreas, heart, placenta, lung and brain. Undergoes proteolytic cleavage in the C-terminal region. Belongs to the glycosyl hydrolase 99 family.