Glyco_18 domain.

Glycosyl hydrolases family 18.

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.

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.

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.

Crystalstructure of the GH18 chitinase ChiB from the chitin utilization locus of Flavobacterium johnsoniae [Flavobacterium johnsoniae UW101]

Crystalstructure of Aspergillus niger chitinase B [Aspergillus niger]

Crystalstructure of a chitinase from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482],3FND_A Crystal structure of a chitinase from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron]

Crystalstructure of chitinase (RmChi1) from Rhizomucor miehei (sp p32 2 1, MR) [Rhizomucor miehei],5YUQ_A Chain A, Chintase [Rhizomucor miehei],5YUQ_B Chain B, Chintase [Rhizomucor miehei],7FBT_A Chain A, Chitinase [Rhizomucor miehei]

ChainAAA, Peroxiredoxin [Clostridioides difficile 630]

Endochitinase 1 OS=Metarhizium robertsii (strain ARSEF 23 / ATCC MYA-3075) OX=655844 GN=chit1 PE=3 SV=1

Class V chitinase CHIT5a OS=Medicago truncatula OX=3880 GN=CHIT5A PE=1 SV=1

Endochitinase B OS=Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139) OX=227321 GN=chiB PE=1 SV=1

Endochitinase B OS=Emericella nidulans OX=162425 GN=chiB PE=1 SV=3

Endochitinase 1 OS=Coccidioides immitis (strain RS) OX=246410 GN=CTS1 PE=3 SV=1