The chitobiase of Serratia marcescens is a beta-N-1,4-acetylhexosaminidase with a glycosyl hydrolase family 20 (GH20) domain that hydrolyzes the beta-1,4-glycosidic linkages in oligomers derived from chitin. Chitin is degraded by a two step process: i) a chitinase hydrolyzes the chitin to oligosaccharides and disaccharides such as di-N-acetyl-D-glucosamine and chitobiose, ii) chitobiase then further degrades these oligomers into monomers. This GH20 domain family includes an N-acetylglucosamidase (GlcNAcase A) from Pseudoalteromonas piscicida and an N-acetylhexosaminidase (SpHex) from Streptomyces plicatus. SpHex lacks the C-terminal PKD (polycystic kidney disease I)-like domain found in the chitobiases. The GH20 hexosaminidases are thought to act via a catalytic mechanism in which the catalytic nucleophile is not provided by solvent or the enzyme, but by the substrate itself.

alpha-1,2-mannosidase, putative. The identification of members of this family as putative alpha-1,2-mannosidases is based on an unpublished characterization of the aman2 gene in Bacillus sp. M-90 by Maruyama,Y., Nakajima,M. and Nakajima,T. (Genbank accession BAA76709, pid g4587313). Most members of this family appear to have signal sequences. Members from the dental pathogen Porphyromonas gingivalis have been described as immunoreactive with periodontitis patient serum. [Cell envelope, Biosynthesis and degradation of surface polysaccharides and lipopolysaccharides]

Glycosyl hydrolase family 92. Members of this family are alpha-1,2-mannosidases, enzymes which remove alpha-1,2-linked mannose residues from Man(9)(GlcNAc)(2) by hydrolysis. They are critical for the maturation of N-linked oligosaccharides and ER-associated degradation.

Putative alpha-1,2-mannosidase [Carbohydrate transport and metabolism].

Glycosyl hydrolase family 20, catalytic domain. This domain has a TIM barrel fold.

BT0459[Bacteroides thetaiotaomicron],6Q63_B BT0459 [Bacteroides thetaiotaomicron],6Q63_C BT0459 [Bacteroides thetaiotaomicron]

Structureof the family GH92 alpha-mannosidase BT3130 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F8Z_B Structure of the family GH92 alpha-mannosidase BT3130 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F8Z_C Structure of the family GH92 alpha-mannosidase BT3130 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F90_A Structure of the family GH92 alpha-mannosidase BT3130 from Bacteroides thetaiotaomicron in complex with Mannoimidazole (ManI) [Bacteroides thetaiotaomicron],6F90_B Structure of the family GH92 alpha-mannosidase BT3130 from Bacteroides thetaiotaomicron in complex with Mannoimidazole (ManI) [Bacteroides thetaiotaomicron],6F90_C Structure of the family GH92 alpha-mannosidase BT3130 from Bacteroides thetaiotaomicron in complex with Mannoimidazole (ManI) [Bacteroides thetaiotaomicron]

Crystalstructure of beta-N-acetylhexosaminidase Am0868 from Akkermansia muciniphila [Akkermansia muciniphila ATCC BAA-835],7CBO_A Crystal structure of beta-N-acetylhexosaminidase Am0868 from Akkermansia muciniphila in complex with GlcNAc [Akkermansia muciniphila ATCC BAA-835]

Structureof the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F91_B Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F91_C Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F91_D Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F91_E Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F91_F Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F91_G Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F91_H Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron],6F92_A Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron in complex with Mannoimidazole (ManI) [Bacteroides thetaiotaomicron],6F92_B Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron in complex with Mannoimidazole (ManI) [Bacteroides thetaiotaomicron],6F92_C Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron in complex with Mannoimidazole (ManI) [Bacteroides thetaiotaomicron],6F92_D Structure of the family GH92 alpha-mannosidase BT3965 from Bacteroides thetaiotaomicron in complex with Mannoimidazole (ManI) [Bacteroides thetaiotaomicron]

CrystalStructure of Beta-N-Acetylhexosaminidase from Arthrobacter aurescens [Paenarthrobacter aurescens TC1]

Beta-hexosaminidase OS=Porphyromonas gingivalis (strain ATCC BAA-308 / W83) OX=242619 GN=nahA PE=3 SV=2

Beta-hexosaminidase Amuc_0868 OS=Akkermansia muciniphila (strain ATCC BAA-835 / DSM 22959 / JCM 33894 / BCRC 81048 / CCUG 64013 / CIP 107961 / Muc) OX=349741 GN=Amuc_0868 PE=1 SV=1

Uncharacterized glycosidase Rv0584 OS=Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv) OX=83332 GN=Rv0584 PE=3 SV=1

Beta-hexosaminidase OS=Vibrio furnissii OX=29494 GN=exoI PE=1 SV=1

Beta-hexosaminidase Amuc_2018 OS=Akkermansia muciniphila (strain ATCC BAA-835 / DSM 22959 / JCM 33894 / BCRC 81048 / CCUG 64013 / CIP 107961 / Muc) OX=349741 GN=Amuc_2018 PE=1 SV=1