Beta-hexosaminidase Amuc_2018

UniProtKB accession:  B2UP57

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Hydrolyzes terminal GlcNAc residues from terminally unbranched N-glycans and from chitobiose. Hydrolyzes beta-1,6-linked N-acetylglucosamine and beta-1,4-linked N-acetylgalactosamine from pNP-alpha-GalNAc[beta1,3Gal]beta1,6GlcNAc and pNP-beta-GlcNAc-beta1,4-GalNAc substrates, respectively, as well as beta-1,2-linked N-acetylglucosamine units from the non-reducing end of N-glycans. Hydrolyzes GlcNAc residues linked to alpha1,3- or alpha1,6-mannose branch, but has low activity on substrates with more than one GlcNAc residue on one of the mannose branches. Releases terminal GlcNAc moieties from the N-glycopeptide Gly-Glu-Asn-(GlcNAc2Man3GlcNAc2)-Arg with high efficiency. Has moderate hydrolytic activity on the chitobiose moiety of N-glycopeptide substrate Gly-Glu-Asn-(GlcNAc2)-Arg. Does not hydrolyze GlcNAc residues from N-glycan structures bearing a bisecting GlcNAc moiety (beta1,4-linked GlcNAc to the beta1,4-linked core mannose) (PubMed:29304441). Potentially capable of cleaving the specific glycoside linkages in the process of mucin degradation in human intestinal tract (Probable). Hydrolyzes synthetic substrate pNP-beta-GlcNAc with high activity and pNP-beta-GalNAc to a lesser extent (PubMed:29304441, PubMed:30846208). Does not hydrolyze pNP-beta-glucose, pNP-beta-galactose, pNP-alpha-glucose, pNP-alpha-galactose, pNP-alpha-GlcNAc or pNP-alpha-fucose (PubMed:29304441).