Presence of α-d-Mannsidic Linkage in Glycoproteins

Abstract

Abstract An α-mannosidase which is able to hydrolyze a naturally occurring α-mannoside, yeast mannan, and several synthetic α-d-mannosides was isolated from jack bean meal. This enzyme was used to explore the linkage of mannose in several glycoproteins. The α-mannosidase was shown to liberate mannose from ovomucoid, orosomucoid, ovalbumin, and glycopeptide prepared from ovalbumin, suggesting the presence of α-mannosidic linkage in these glycoproteins.