This is a family of eukaryotic enzymes belonging to glycosyl hydrolase family 63. They catalyse the specific cleavage of the non-reducing terminal glucose residue from Glc(3)Man(9)GlcNAc(2). Mannosyl oligosaccharide glucosidase EC:3.2.1.106 is the first enzyme in the N-linked oligosaccharide processing pathway. This family represents the N-terminal beta sandwich domain [1].

1: Specificity of Processing alpha-glucosidase I is guided by the substrate conformation: crystallographic and in silico studies. Barker MK, Rose DR; J Biol Chem. 2013;288:13563-13574. PMID:23536181