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.

Chitinase [Carbohydrate transport and metabolism].

Glycosyl hydrolases family 18.

This conserved domain family includes xylanase inhibitor Xip-I, and the class III plant chitinases such as hevamine, concanavalin B, and PPL2, all of which have a glycosyl hydrolase family 18 (GH18) domain. Hevamine is a class III endochitinase that hydrolyzes the linear polysaccharide chains of chitin and peptidoglycan and is important for defense against pathogenic bacteria and fungi. PPL2 (Parkia platycephala lectin 2) is a class III chitinase from Parkia platycephala seeds that hydrolyzes beta(1-4) glycosidic bonds linking 2-acetoamido-2-deoxy-beta-D-glucopyranose units in chitin.

chitin-binding domain of Chi A1-like proteins. This group contains proteins related to the chitin binding domain of chitinase A1 (ChiA1) of Bacillus circulans WL-12. Glycosidase ChiA1 hydrolyzes chitin and is comprised of several domains: the C-terminal chitin binding domain, an N-terminal and catalytic domain, and 2 fibronectin type III-like domains. Chitinases function in invertebrates in the degradation of old exoskeletons, in fungi to utilize chitin in cell walls, and in bacteria which use chitin as an energy source. Bacillus circulans WL-12 ChiA1 facilitates invasion of fungal cell walls. The ChiAi chitin binding domain is required for the specific recognition of insoluble chitin. although topologically and structurally related, ChiA1 lacks the characteristic aromatic residues of Erwinia chrysanthemi endoglucanase Z (CBD(EGZ)).

Crystalstructure of putative Chitinase A from Streptomyces coelicolor. [Streptomyces coelicolor]

CrystalStructure of a Family GH18 Chitinase from Chromobacterium violaceum [Chromobacterium violaceum ATCC 12472]

1.25Angstrom Crystal Structure of Chitinase from Bacillus anthracis. [Bacillus anthracis],5KZ6_B 1.25 Angstrom Crystal Structure of Chitinase from Bacillus anthracis. [Bacillus anthracis]

Crystalstricture of wild-type chitinase from Bacillus cereus NCTU2 [Bacillus cereus],3N12_A Crystal stricture of chitinase in complex with zinc atoms from Bacillus cereus NCTU2 [Bacillus cereus]

Crystalstricture of E145Q chitinase in complex with NAG from Bacillus cereus NCTU2 [Bacillus cereus]

Chitinase D OS=Niallia circulans OX=1397 GN=chiD PE=1 SV=4

Exochitinase 1 OS=Streptomyces olivaceoviridis OX=1921 GN=chi01 PE=1 SV=1

Probable class II chitinase ARB_00204 OS=Arthroderma benhamiae (strain ATCC MYA-4681 / CBS 112371) OX=663331 GN=ARB_00204 PE=1 SV=2

Chitinase A1 OS=Niallia circulans OX=1397 GN=chiA1 PE=1 SV=1

Exoglucanase B OS=Cellulomonas fimi (strain ATCC 484 / DSM 20113 / JCM 1341 / NBRC 15513 / NCIMB 8980 / NCTC 7547) OX=590998 GN=cbhB PE=1 SV=1