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https://bar.utoronto.ca/thalemine/service/ is incorrect| Description | O-Glycosyl hydrolases ( ) are a widespread group of enzymes that hydrolyse the glycosidic bond between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. A classification system for glycosyl hydrolases, based on sequence similarity, has led to the definition of 85 different families [ , ]. This classification is available on the CAZy (CArbohydrate-Active EnZymes) website.Glycoside hydrolase family 19 comprises enzymes with only one known activity; chitinase ( ). Chitinases [ ] are enzymes that catalyze the hydrolysis of the beta-1,4-N-acetyl-D-glucosamine linkages in chitin polymers. Chitinases belong to glycoside hydrolase families 18 or 19 []. Chitinases of family 19 (also known as classes IA or I and IB or II) are enzymes from plants that function in the defence against fungal and insect pathogens by destroying their chitin-containing cell wall. Class IA/I and IB/II enzymes differ in the presence (IA/I) or absence (IB/II) of a N-terminal chitin-binding domain. The catalytic domain of these enzymes consist of about 220 to 230 amino acid residues. The At2g43600 protein from Arabidopsis thaliana is presumably inactive as a chitinase because it lacks the Glu residue that is essential for catalytic activity. | Name | Glycoside hydrolase, family 19 |
| Short Name | Glyco_hydro_19 | Type | Family |
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