beta-N-acetylhexosaminidase is a glycoside hydrolase family 20 protein that catalyzes the hydrolysis of terminal non-reducing N-acetyl-D-hexosamine residues in N-acetyl-beta-D-hexosaminides
The chitobiase of Serratia marcescens is a beta-N-1,4-acetylhexosaminidase with a glycosyl ...
334-805
0e+00
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. 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.
:
Pssm-ID: 119337 Cd Length: 445 Bit Score: 739.10 E-value: 0e+00
Putative carbohydrate binding domain; This domain represents the N terminal domain in ...
38-195
3.34e-87
Putative carbohydrate binding domain; This domain represents the N terminal domain in chitobiases and beta-hexosaminidases EC:3.2.1.52. It is composed of a beta sandwich structure that is similar in structure to the cellulose binding domain of cellulase from Cellulomonas fimi. This suggests that this may be a carbohydrate binding domain.
:
Pssm-ID: 427179 Cd Length: 153 Bit Score: 274.21 E-value: 3.34e-87
Chitobiase/beta-hexosaminidase C-terminal domain; This short domain represents the C terminal ...
810-886
1.05e-33
Chitobiase/beta-hexosaminidase C-terminal domain; This short domain represents the C terminal domain in chitobiases and beta-hexosaminidases EC:3.2.1.52. It is composed of a beta sandwich structure. The function of this domain is unknown.
:
Pssm-ID: 427180 Cd Length: 75 Bit Score: 123.90 E-value: 1.05e-33
The chitobiase of Serratia marcescens is a beta-N-1,4-acetylhexosaminidase with a glycosyl ...
334-805
0e+00
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. 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.
Pssm-ID: 119337 Cd Length: 445 Bit Score: 739.10 E-value: 0e+00
Putative carbohydrate binding domain; This domain represents the N terminal domain in ...
38-195
3.34e-87
Putative carbohydrate binding domain; This domain represents the N terminal domain in chitobiases and beta-hexosaminidases EC:3.2.1.52. It is composed of a beta sandwich structure that is similar in structure to the cellulose binding domain of cellulase from Cellulomonas fimi. This suggests that this may be a carbohydrate binding domain.
Pssm-ID: 427179 Cd Length: 153 Bit Score: 274.21 E-value: 3.34e-87
Putative carbohydrate binding domain; This domain represents the N terminal domain in ...
36-197
1.42e-82
Putative carbohydrate binding domain; This domain represents the N terminal domain in chitobiases and beta-hexosaminidases EC:3.2.1.52. It is composed of a beta sandwich structure that is similar in structure to the cellulose binding domain of cellulase from Cellulomonas fimi. This suggests that this may be a carbohydrate binding domain.
Pssm-ID: 215017 Cd Length: 160 Bit Score: 262.27 E-value: 1.42e-82
Chitobiase/beta-hexosaminidase C-terminal domain; This short domain represents the C terminal ...
810-886
1.05e-33
Chitobiase/beta-hexosaminidase C-terminal domain; This short domain represents the C terminal domain in chitobiases and beta-hexosaminidases EC:3.2.1.52. It is composed of a beta sandwich structure. The function of this domain is unknown.
Pssm-ID: 427180 Cd Length: 75 Bit Score: 123.90 E-value: 1.05e-33
C-terminal Early set domain associated with the catalytic domain of chitobiase (also called ...
826-889
3.80e-21
C-terminal Early set domain associated with the catalytic domain of chitobiase (also called N-acetylglucosaminidase); E or "early" set domains are associated with the catalytic domain of chitobiase at the C-terminus. Chitobiase digests the beta, 1-4 glycosidic bonds of the N-acetylglucosamine (NAG) oligomers found in chitin, an important structural element of fungal cell wall and arthropod exoskeletons. It is thought to proceed through an acid-base reaction mechanism, in which one protein carboxylate acts as the catalytic acid, while the nucleophile is the polar acetamido group of the sugar in a substrate-assisted reaction with retention of the anomeric configuration. The C-terminus of chitobiase may be related to the immunoglobulin and/or fibronectin type III superfamilies. E set domains are associated with different types of catalytic domains at either the N-terminal or C-terminal end and may be involved in homodimeric/tetrameric/dodecameric interactions. Members of this family include members of the alpha amylase family, sialidase, galactose oxidase, cellulase, cellulose, hyaluronate lyase, chitobiase, and chitinase, among others.
Pssm-ID: 199879 Cd Length: 62 Bit Score: 87.63 E-value: 3.80e-21
The chitobiase of Serratia marcescens is a beta-N-1,4-acetylhexosaminidase with a glycosyl ...
334-805
0e+00
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. 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.
Pssm-ID: 119337 Cd Length: 445 Bit Score: 739.10 E-value: 0e+00
The chitobiase of Serratia marcescens is a beta-N-1,4-acetylhexosaminidase with a glycosyl ...
338-773
5.86e-114
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.
Pssm-ID: 119333 Cd Length: 357 Bit Score: 352.65 E-value: 5.86e-114
Beta-N-acetylhexosaminidases of glycosyl hydrolase family 20 (GH20) catalyze the removal of ...
340-768
2.87e-95
Beta-N-acetylhexosaminidases of glycosyl hydrolase family 20 (GH20) catalyze the removal of beta-1,4-linked N-acetyl-D-hexosamine residues from the non-reducing ends of N-acetyl-beta-D-hexosaminides including N-acetylglucosides and N-acetylgalactosides. These enzymes are broadly distributed in microorganisms, plants and animals, and play roles in various key physiological and pathological processes. These processes include cell structural integrity, energy storage, cellular signaling, fertilization, pathogen defense, viral penetration, the development of carcinomas, inflammatory events and lysosomal storage disorders. The GH20 enzymes include the eukaryotic beta-N-acetylhexosaminidases A and B, the bacterial chitobiases, dispersin B, and lacto-N-biosidase. The GH20 hexosaminidases are thought to act via a catalytic mechanism in which the catalytic nucleophile is not provided by the solvent or the enzyme, but by the substrate itself.
Pssm-ID: 119331 [Multi-domain] Cd Length: 303 Bit Score: 301.66 E-value: 2.87e-95
Putative carbohydrate binding domain; This domain represents the N terminal domain in ...
38-195
3.34e-87
Putative carbohydrate binding domain; This domain represents the N terminal domain in chitobiases and beta-hexosaminidases EC:3.2.1.52. It is composed of a beta sandwich structure that is similar in structure to the cellulose binding domain of cellulase from Cellulomonas fimi. This suggests that this may be a carbohydrate binding domain.
Pssm-ID: 427179 Cd Length: 153 Bit Score: 274.21 E-value: 3.34e-87
Putative carbohydrate binding domain; This domain represents the N terminal domain in ...
36-197
1.42e-82
Putative carbohydrate binding domain; This domain represents the N terminal domain in chitobiases and beta-hexosaminidases EC:3.2.1.52. It is composed of a beta sandwich structure that is similar in structure to the cellulose binding domain of cellulase from Cellulomonas fimi. This suggests that this may be a carbohydrate binding domain.
Pssm-ID: 215017 Cd Length: 160 Bit Score: 262.27 E-value: 1.42e-82
A subgroup of the Glycosyl hydrolase family 20 (GH20) catalytic domain found in proteins ...
338-777
2.11e-53
A subgroup of the Glycosyl hydrolase family 20 (GH20) catalytic domain found in proteins similar to the N-acetylhexosaminidase from Streptomyces plicatus (SpHex). SpHex catalyzes the hydrolysis of N-acetyl-beta-hexosaminides. An Asp residue within the active site plays a critical role in substrate-assisted catalysis by orienting the 2-acetamido group and stabilizing the transition state. 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. Proteins belonging to this subgroup lack the C-terminal PKD (polycystic kidney disease I)-like domain found in the chitobiases.
Pssm-ID: 119336 Cd Length: 329 Bit Score: 189.08 E-value: 2.11e-53
A functionally uncharacterized subgroup of the Glycosyl hydrolase family 20 (GH20) catalytic ...
338-767
4.69e-41
A functionally uncharacterized subgroup of the Glycosyl hydrolase family 20 (GH20) catalytic domain found in proteins similar to the chitobiase of Serratia marcescens, a beta-N-1,4-acetylhexosaminidase 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 subgroup 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.
Pssm-ID: 119338 Cd Length: 311 Bit Score: 153.34 E-value: 4.69e-41
Beta-N-acetylhexosaminidases catalyze the removal of beta-1,4-linked N-acetyl-D-hexosamine ...
338-767
3.68e-36
Beta-N-acetylhexosaminidases catalyze the removal of beta-1,4-linked N-acetyl-D-hexosamine residues from the non-reducing ends of N-acetyl-beta-D-hexosaminides including N-acetylglucosides and N-acetylgalactosides. The hexA and hexB genes encode the alpha- and beta-subunits of the two major beta-N-acetylhexosaminidase isoenzymes, N-acetyl-beta-D-hexosaminidase A (HexA) and beta-N-acetylhexosaminidase B (HexB). Both the alpha and the beta catalytic subunits have a TIM-barrel fold and belong to the glycosyl hydrolase family 20 (GH20). The HexA enzyme is a heterodimer containing one alpha and one beta subunit while the HexB enzyme is a homodimer containing two beta-subunits. Hexosaminidase mutations cause an inability to properly hydrolyze certain sphingolipids which accumulate in lysosomes within the brain, resulting in the lipid storage disorders Tay-Sachs and Sandhoff. Mutations in the alpha subunit cause in a deficiency in the HexA enzyme and result in Tay-Sachs, mutations in the beta-subunit cause in a deficiency in both HexA and HexB enzymes and result in Sandhoff disease. In both disorders GM(2) gangliosides accumulate in lysosomes. 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.
Pssm-ID: 119332 [Multi-domain] Cd Length: 348 Bit Score: 140.04 E-value: 3.68e-36
Chitobiase/beta-hexosaminidase C-terminal domain; This short domain represents the C terminal ...
810-886
1.05e-33
Chitobiase/beta-hexosaminidase C-terminal domain; This short domain represents the C terminal domain in chitobiases and beta-hexosaminidases EC:3.2.1.52. It is composed of a beta sandwich structure. The function of this domain is unknown.
Pssm-ID: 427180 Cd Length: 75 Bit Score: 123.90 E-value: 1.05e-33
Glycosyl hydrolase family 20 (GH20) catalytic domain of dispersin B (DspB), lacto-N-biosidase ...
339-710
3.88e-28
Glycosyl hydrolase family 20 (GH20) catalytic domain of dispersin B (DspB), lacto-N-biosidase (LnbB) and related proteins. Dispersin B is a soluble beta-N-acetylglucosamidase found in bacteria that hydrolyzes the beta-1,6-linkages of PGA (poly-beta-(1,6)-N-acetylglucosamine), a major component of the extracellular polysaccharide matrix. Lacto-N-biosidase hydrolyzes lacto-N-biose (LNB) type I oligosaccharides at the nonreducing terminus to produce lacto-N-biose as part of the GNB/LNB (galacto-N-biose/lacto-N-biose I) degradation pathway. The lacto-N-biosidase from Bifidobacterium bifidum has this GH20 domain, a carbohydrate binding module 32, and a bacterial immunoglobulin-like domain 2, as well as a YSIRK signal peptide and a G5 membrane anchor at the N and C termini, respectively. 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.
Pssm-ID: 119334 Cd Length: 326 Bit Score: 116.23 E-value: 3.88e-28
C-terminal Early set domain associated with the catalytic domain of chitobiase (also called ...
826-889
3.80e-21
C-terminal Early set domain associated with the catalytic domain of chitobiase (also called N-acetylglucosaminidase); E or "early" set domains are associated with the catalytic domain of chitobiase at the C-terminus. Chitobiase digests the beta, 1-4 glycosidic bonds of the N-acetylglucosamine (NAG) oligomers found in chitin, an important structural element of fungal cell wall and arthropod exoskeletons. It is thought to proceed through an acid-base reaction mechanism, in which one protein carboxylate acts as the catalytic acid, while the nucleophile is the polar acetamido group of the sugar in a substrate-assisted reaction with retention of the anomeric configuration. The C-terminus of chitobiase may be related to the immunoglobulin and/or fibronectin type III superfamilies. E set domains are associated with different types of catalytic domains at either the N-terminal or C-terminal end and may be involved in homodimeric/tetrameric/dodecameric interactions. Members of this family include members of the alpha amylase family, sialidase, galactose oxidase, cellulase, cellulose, hyaluronate lyase, chitobiase, and chitinase, among others.
Pssm-ID: 199879 Cd Length: 62 Bit Score: 87.63 E-value: 3.80e-21
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
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