Two cytosolic deglycosylating systems can generate free oligosaccharides from glycoproteins; a deglycosylation complex that hydrolyses the whole glycan from an unfolded protein and cytosolic endo-beta-N-acetylglucosaminidase (ENGASE) that catalyses the endohydrolysis of -(Man(GlcNAc)2)Asn- structures in glycoproteins, leaving one N-acetyl-D-glucosamine (GlcNAc) residue attached to the protein (Suzuki et al. 2002). Glycans with a single GlcNAc at their reducing termini need to be further degraded by a cytosolic alpha-mannosidase, MAN2C1.
Emori, Y, Kitajima, K, Inoue, Y, Sugimoto, S, Inoue, S, Yano, K, Suzuki, T, Lennarz, WJ
mannosyl-glycoprotein endo-beta-N-acetylglucosaminidase activity of ENGASE [cytosol]
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