Glycoside hydrolase family 19, chitinase domain. Chitinases are enzymes that catalyze the hydrolysis of the beta-1,4-N-acetyl-D-glucosamine linkages in chitin polymers. Glycoside hydrolase family 19 chitinases are found primarily in plants (classes I, III, and IV), but some are found in bacteria. Class I and II chitinases are similar in their catalytic domains. Class I chitinases have an N-terminal cysteine-rich, chitin-binding domain which is separated from the catalytic domain by a proline and glycine-rich hinge region. Class II chitinases lack both the chitin-binding domain and the hinge region. Class IV chitinases are similar to class I chitinases, but they are smaller in size due to certain deletions. Despite lacking any significant sequence homology with lysozymes, structural analysis reveals that family 19 chitinases, together with family 46 chitosanases, are similar to several lysozymes including those from T4-phage and from goose. The structures reveal that the different enzyme groups arose from a common ancestor glycohydrolase antecedent to the prokaryotic/eukaryotic divergence.

Chitinase class I.

Chitodextrinase [Carbohydrate transport and metabolism].

N-acetylglucosamine-binding protein GbpA.

PKD domain. This entry is composed of PKD domains found in bacterial surface proteins.

ChainA, GH19 Chitinase [Ficus microcarpa],7V92_B Chain B, GH19 Chitinase [Ficus microcarpa],7V92_C Chain C, GH19 Chitinase [Ficus microcarpa],7V92_D Chain D, GH19 Chitinase [Ficus microcarpa]

ChainA, GH19 Chitinase [Ficus microcarpa],7V91_B Chain B, GH19 Chitinase [Ficus microcarpa],7V91_C Chain C, GH19 Chitinase [Ficus microcarpa],7V91_D Chain D, GH19 Chitinase [Ficus microcarpa]

TheRefined Crystal Structure Of An Endochitinase From Hordeum Vulgare L. Seeds To 1.8 Angstroms Resolution [Hordeum vulgare]

CrystalStructure of a putative catalytic domain of a chitinase-like protein (HbCLP1) from Hevea brasiliensis [Hevea brasiliensis],4MST_B Crystal Structure of a putative catalytic domain of a chitinase-like protein (HbCLP1) from Hevea brasiliensis [Hevea brasiliensis]

CrystalStructure Of Chitinase At 1.91a Resolution [Hordeum vulgare],1CNS_B Crystal Structure Of Chitinase At 1.91a Resolution [Hordeum vulgare]

Endochitinase 2 (Fragment) OS=Solanum tuberosum OX=4113 GN=CHTB2 PE=2 SV=1

Endochitinase 1 (Fragment) OS=Solanum tuberosum OX=4113 GN=CHTB1 PE=2 SV=1

Endochitinase 3 (Fragment) OS=Solanum tuberosum OX=4113 GN=CHTB3 PE=2 SV=1

Endochitinase B OS=Nicotiana tabacum OX=4097 GN=CHN50 PE=1 SV=1

Endochitinase A OS=Nicotiana tabacum OX=4097 GN=CHN48 PE=1 SV=2