glycoside hydrolase family 18 protein similar to chitinase, which catalyzes the random endo-hydrolysis of the 1,4-beta-linkages of N-acetylglucosamine in chitin and chitodextrins
Chitinase A, N-terminal domain; This domain is found in a number of bacterial chitinases and ...
5-134
2.67e-65
Chitinase A, N-terminal domain; This domain is found in a number of bacterial chitinases and similar viral proteins. It is organized into a fibronectin III module domain-like fold, comprising only beta strands. Its function is not known, but it may be involved in interaction with the enzyme substrate, chitin. It is separated by a hinge region from the catalytic domain (pfam00704); this hinge region is probably mobile, allowing the N-terminal domain to have different relative positions in solution.
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Pssm-ID: 400568 Cd Length: 130 Bit Score: 208.08 E-value: 2.67e-65
The GH18 (glycosyl hydrolases, family 18) type II chitinases hydrolyze chitin, an abundant ...
140-524
8.89e-135
The GH18 (glycosyl hydrolases, family 18) type II chitinases hydrolyze chitin, an abundant polymer of N-acetylglucosamine and have been identified in bacteria, fungi, insects, plants, viruses, and protozoan parasites. The structure of this domain is an eight-stranded alpha/beta barrel with a pronounced active-site cleft at the C-terminal end of the beta-barrel.
Pssm-ID: 119365 [Multi-domain] Cd Length: 322 Bit Score: 393.92 E-value: 8.89e-135
Chitinase A, N-terminal domain; This domain is found in a number of bacterial chitinases and ...
5-134
2.67e-65
Chitinase A, N-terminal domain; This domain is found in a number of bacterial chitinases and similar viral proteins. It is organized into a fibronectin III module domain-like fold, comprising only beta strands. Its function is not known, but it may be involved in interaction with the enzyme substrate, chitin. It is separated by a hinge region from the catalytic domain (pfam00704); this hinge region is probably mobile, allowing the N-terminal domain to have different relative positions in solution.
Pssm-ID: 400568 Cd Length: 130 Bit Score: 208.08 E-value: 2.67e-65
N-terminal Early set domain associated with the catalytic domain of chitinase; E or "early" ...
7-108
1.48e-46
N-terminal Early set domain associated with the catalytic domain of chitinase; E or "early" set domains are associated with the catalytic domain of chitinase at the N-terminal end. Chitinases hydrolyze the abundant natural biopolymer chitin, producing smaller chito-oligosaccharides. Chitin consists of multiple N-acetyl-D-glucosamine (NAG) residues connected via beta-1,4-glycosidic linkages and is an important structural element of fungal cell wall and arthropod exoskeletons. On the basis of the mode of chitin hydrolysis, chitinases are classified as random, endo-, and exo-chitinases and belong to families 18 and 19 of glycosyl hydrolases based on sequence criteria. The N-terminal domain of chitinase may be related to the immunoglobulin and/or fibronectin type III superfamilies. These 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: 199880 Cd Length: 105 Bit Score: 157.91 E-value: 1.48e-46
The GH18 (glycosyl hydrolases, family 18) type II chitinases hydrolyze chitin, an abundant ...
140-524
8.89e-135
The GH18 (glycosyl hydrolases, family 18) type II chitinases hydrolyze chitin, an abundant polymer of N-acetylglucosamine and have been identified in bacteria, fungi, insects, plants, viruses, and protozoan parasites. The structure of this domain is an eight-stranded alpha/beta barrel with a pronounced active-site cleft at the C-terminal end of the beta-barrel.
Pssm-ID: 119365 [Multi-domain] Cd Length: 322 Bit Score: 393.92 E-value: 8.89e-135
This conserved domain family includes a large number of catalytically inactive chitinase-like ...
140-533
4.90e-68
This conserved domain family includes a large number of catalytically inactive chitinase-like lectins (chitolectins) including YKL-39, YKL-40 (HCGP39), YM1, oviductin, and AMCase (acidic mammalian chitinase), as well as catalytically active chitotriosidases. The conserved domain is an eight-stranded alpha/beta barrel fold belonging to the family 18 glycosyl hydrolases. The fold has a pronounced active-site cleft at the C-terminal end of the beta-barrel. The chitolectins lack a key active site glutamate (the proton donor required for hydrolytic activity) but retain highly conserved residues involved in oligosaccharide binding. Chitotriosidase is a chitinolytic enzyme expressed in maturing macrophages, which suggests that it plays a part in antimicrobial defense. Chitotriosidase hydrolyzes chitotriose, as well as colloidal chitin to yield chitobiose and is therefore considered an exochitinase. Chitotriosidase occurs in two major forms, the large form being converted to the small form by either RNA or post-translational processing. Although the small form, containing the chitinase domain alone, is sufficient for the chitinolytic activity, the additional C-terminal chitin-binding domain of the large form plays a role in processing colloidal chitin. The chitotriosidase gene is nonessential in humans, as about 35% of the population are heterozygous and 6% homozygous for an inactivated form of the gene. HCGP39 is a 39-kDa human cartilage glycoprotein thought to play a role in connective tissue remodeling and defense against pathogens.
Pssm-ID: 119351 [Multi-domain] Cd Length: 362 Bit Score: 223.59 E-value: 4.90e-68
Chitinase A, N-terminal domain; This domain is found in a number of bacterial chitinases and ...
5-134
2.67e-65
Chitinase A, N-terminal domain; This domain is found in a number of bacterial chitinases and similar viral proteins. It is organized into a fibronectin III module domain-like fold, comprising only beta strands. Its function is not known, but it may be involved in interaction with the enzyme substrate, chitin. It is separated by a hinge region from the catalytic domain (pfam00704); this hinge region is probably mobile, allowing the N-terminal domain to have different relative positions in solution.
Pssm-ID: 400568 Cd Length: 130 Bit Score: 208.08 E-value: 2.67e-65
N-terminal Early set domain associated with the catalytic domain of chitinase; E or "early" ...
7-108
1.48e-46
N-terminal Early set domain associated with the catalytic domain of chitinase; E or "early" set domains are associated with the catalytic domain of chitinase at the N-terminal end. Chitinases hydrolyze the abundant natural biopolymer chitin, producing smaller chito-oligosaccharides. Chitin consists of multiple N-acetyl-D-glucosamine (NAG) residues connected via beta-1,4-glycosidic linkages and is an important structural element of fungal cell wall and arthropod exoskeletons. On the basis of the mode of chitin hydrolysis, chitinases are classified as random, endo-, and exo-chitinases and belong to families 18 and 19 of glycosyl hydrolases based on sequence criteria. The N-terminal domain of chitinase may be related to the immunoglobulin and/or fibronectin type III superfamilies. These 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: 199880 Cd Length: 105 Bit Score: 157.91 E-value: 1.48e-46
The GH18 (glycosyl hydrolase, family 18) type II chitinases hydrolyze chitin, an abundant ...
140-371
4.54e-38
The GH18 (glycosyl hydrolase, family 18) type II chitinases hydrolyze chitin, an abundant polymer of beta-1,4-linked N-acetylglucosamine (GlcNAc) which is a major component of the cell wall of fungi and the exoskeleton of arthropods. Chitinases have been identified in viruses, bacteria, fungi, protozoan parasites, insects, and plants. The structure of the GH18 domain is an eight-stranded beta/alpha barrel with a pronounced active-site cleft at the C-terminal end of the beta-barrel. The GH18 family includes chitotriosidase, chitobiase, hevamine, zymocin-alpha, narbonin, SI-CLP (stabilin-1 interacting chitinase-like protein), IDGF (imaginal disc growth factor), CFLE (cortical fragment-lytic enzyme) spore hydrolase, the type III and type V plant chitinases, the endo-beta-N-acetylglucosaminidases, and the chitolectins. The GH85 (glycosyl hydrolase, family 85) ENGases (endo-beta-N-acetylglucosaminidases) are closely related to the GH18 chitinases and are included in this alignment model.
Pssm-ID: 119349 [Multi-domain] Cd Length: 210 Bit Score: 139.05 E-value: 4.54e-38
The class V plant chitinases have a glycosyl hydrolase family 18 (GH18) domain, but lack the ...
222-529
2.18e-32
The class V plant chitinases have a glycosyl hydrolase family 18 (GH18) domain, but lack the chitin-binding domain present in other GH18 enzymes. The GH18 domain of the class V chitinases has endochitinase activity in some cases and no catalytic activity in others. Included in this family is a lectin found in black locust (Robinia pseudoacacia) bark, which binds chitin but lacks chitinase activity. Also included is a chitinase-related receptor-like kinase (CHRK1) from tobacco (Nicotiana tabacum), with an N-terminal GH18 domain and a C-terminal kinase domain, which is thought to be part of a plant signaling pathway. The GH18 domain of CHRK1 is expressed extracellularly where it binds chitin but lacks chitinase activity.
Pssm-ID: 119358 [Multi-domain] Cd Length: 299 Bit Score: 125.94 E-value: 2.18e-32
The IDGF's (imaginal disc growth factors) are a family of growth factors identified in insects ...
165-515
4.30e-22
The IDGF's (imaginal disc growth factors) are a family of growth factors identified in insects that include at least five members, some of which are encoded by genes in a tight cluster. The IDGF's have an eight-stranded alpha/beta barrel fold and are related to the glycosyl hydrolase family 18 (GH18) chitinases, but they have an amino acid substitution known to abolish chitinase catalytic activity. IDGFs may have evolved from chitinases to gain new functions as growth factors, interacting with cell surface glycoproteins involved in growth-promoting processes.
Pssm-ID: 119352 [Multi-domain] Cd Length: 413 Bit Score: 98.54 E-value: 4.30e-22
Zymocin, alpha subunit. Zymocin is a heterotrimeric enzyme that inhibits yeast cell cycle ...
227-447
1.16e-18
Zymocin, alpha subunit. Zymocin is a heterotrimeric enzyme that inhibits yeast cell cycle progression. The zymocin alpha subunit has a chitinase activity that is essential for holoenzyme action from the cell exterior while the gamma subunit contains the intracellular toxin responsible for G1 phase cell cycle arrest. The zymocin alpha and beta subunits are thought to act from the cell's exterior by docking to the cell wall-associated chitin, thus mediating gamma-toxin translocation. The alpha subunit has an eight-stranded TIM barrel fold similar to that of family 18 glycosyl hydrolases such as hevamine, chitolectin, and chitobiase.
Pssm-ID: 119357 [Multi-domain] Cd Length: 345 Bit Score: 87.36 E-value: 1.16e-18
Cortical fragment-lytic enzyme (CFLE) is a peptidoglycan hydrolase involved in bacterial ...
263-532
1.58e-16
Cortical fragment-lytic enzyme (CFLE) is a peptidoglycan hydrolase involved in bacterial endospore germination. CFLE is expressed as an inactive preprotein (called SleB) in the forespore compartment of sporulating cells. SleB translocates across the forespore inner membrane and is deposited as a mature enzyme in the cortex layer of the spore. As part of a sensory mechanism capable of initiating germination, CFLE degrades a spore-specific peptidoglycan constituent called muramic-acid delta-lactam that comprises the outer cortex. CFLE has a C-terminal glycosyl hydrolase family 18 (GH18) catalytic domain as well as two N-terminal LysM peptidoglycan-binding domains. In addition to SleB, this family includes YaaH, YdhD, and YvbX from Bacillus subtilis.
Pssm-ID: 119353 [Multi-domain] Cd Length: 313 Bit Score: 80.39 E-value: 1.58e-16
Chitobiase (also known as di-N-acetylchitobiase) is a lysosomal glycosidase that hydrolyzes ...
266-534
1.02e-10
Chitobiase (also known as di-N-acetylchitobiase) is a lysosomal glycosidase that hydrolyzes the reducing-end N-acetylglucosamine from the chitobiose core of oligosaccharides during the ordered degradation of asparagine-linked glycoproteins in eukaryotes. Chitobiase can only do so if the asparagine that joins the oligosaccharide to protein is previously removed by a glycosylasparaginase. Chitobiase is therefore the final step in the lysosomal degradation of the protein/carbohydrate linkage component of asparagine-linked glycoproteins. The catalytic domain of chitobiase is an eight-stranded alpha/beta barrel fold similar to that of other family 18 glycosyl hydrolases such as hevamine and chitotriosidase.
Pssm-ID: 119354 [Multi-domain] Cd Length: 358 Bit Score: 63.22 E-value: 1.02e-10
The Bacteroides thetaiotaomicron protein represented by pdb structure 3CO4 is an ...
243-429
2.31e-10
The Bacteroides thetaiotaomicron protein represented by pdb structure 3CO4 is an uncharacterized bacterial member of the family 18 glycosyl hydrolases with homologs found in Flavobacterium, Stigmatella, and Pseudomonas.
Pssm-ID: 119362 [Multi-domain] Cd Length: 253 Bit Score: 61.31 E-value: 2.31e-10
polycystic kidney disease I (PKD) domain; similar to other cell-surface modules, with an ...
41-110
3.26e-07
polycystic kidney disease I (PKD) domain; similar to other cell-surface modules, with an IG-like fold; domain probably functions as a ligand binding site in protein-protein or protein-carbohydrate interactions; a single instance of the repeat is presented here. The domain is also found in microbial collagenases and chitinases.
Pssm-ID: 238084 [Multi-domain] Cd Length: 81 Bit Score: 47.88 E-value: 3.26e-07
Narbonin is a plant 2S protein from the globulin fraction of narbon bean (Vicia narbonensis L.) ...
239-295
5.97e-06
Narbonin is a plant 2S protein from the globulin fraction of narbon bean (Vicia narbonensis L.) cotyledons with unknown function. Narbonin has a glycosyl hydrolase family 18 (GH18) domain without the conserved catalytic residues and with no known enzymatic activity. Narbonin amounts to up to 3% of the total seed globulins of mature seeds and was thought to be a storage protein but was found to degrade too slowly during germination. This family also includes the VfNOD32 nodulin from Vicia faba.
Pssm-ID: 119361 Cd Length: 253 Bit Score: 47.75 E-value: 5.97e-06
Endo-beta-N-acetylglucosaminidases are bacterial chitinases that hydrolyze the chitin core of ...
247-434
1.41e-03
Endo-beta-N-acetylglucosaminidases are bacterial chitinases that hydrolyze the chitin core of various asparagine (N)-linked glycans and glycoproteins. The endo-beta-N-acetylglucosaminidases have a glycosyl hydrolase family 18 (GH18) catalytic domain. Some members also have an additional C-terminal glycosyl hydrolase family 20 (GH20) domain while others have an N-terminal domain of unknown function (pfam08522). Members of this family include endo-beta-N-acetylglucosaminidase S (EndoS) from Streptococcus pyogenes, EndoF1, EndoF2, EndoF3, and EndoH from Flavobacterium meningosepticum, and EndoE from Enterococcus faecalis. EndoS is a secreted endoglycosidase from Streptococcus pyogenes that specifically hydrolyzes the glycan on human IgG between two core N-acetylglucosamine residues. EndoE is a secreted endoglycosidase, encoded by the ndoE gene in Enterococcus faecalis, that hydrolyzes the glycan on human RNase B.
Pssm-ID: 119359 Cd Length: 255 Bit Score: 40.44 E-value: 1.41e-03
GH18 domain of Chitinase D (ChiD). ChiD, a chitinase found in Bacillus circulans, hydrolyzes ...
247-342
3.99e-03
GH18 domain of Chitinase D (ChiD). ChiD, a chitinase found in Bacillus circulans, hydrolyzes the 1,4-beta-linkages of N-acetylglucosamine in chitin and chitodextrins. The domain architecture of ChiD includes a catalytic glycosyl hydrolase family 18 (GH18) domain, a chitin-binding domain, and a fibronectin type III domain. The chitin-binding and fibronectin type III domains are located either N-terminal or C-terminal to the catalytic domain. This family includes exochitinase Chi36 from Bacillus cereus.
Pssm-ID: 119350 [Multi-domain] Cd Length: 312 Bit Score: 39.63 E-value: 3.99e-03
GH18 domain of an uncharacterized family of bacterial proteins, which share a common ...
247-429
4.79e-03
GH18 domain of an uncharacterized family of bacterial proteins, which share a common three-domain architecture: an N-terminal glycosyl hydrolase family 18 (GH18) domain, a glycosyl transferase family 2 domain, and a C-terminal polysaccharide deacetylase domain.
Pssm-ID: 119366 [Multi-domain] Cd Length: 298 Bit Score: 39.32 E-value: 4.79e-03
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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