O-Glycosyl hydrolases (EC 3.2.1.-) 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 [PMID:7624375, PMID:8535779, PUB00005672]. This classification is available on the CAZy (CArbohydrate-Active EnZymes) web site [PUB00007032]. Because the fold of proteins is better conserved than their sequences, some of the families can be grouped in 'clans'.

O-Glycosyl hydrolases (EC 3.2.1.-) 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 [PMID:1747104, PMID:8352747, PMID:8687420, PMID:1732212, PMID:8535779, PUB00005672]. This classification is available on the CAZy (CArbohydrate-Active EnZymes) web site [PUB00007032]. Because the fold of proteins is better conserved than their sequences, some of the families can be grouped in 'clans'.

Glycoside hydrolase family 9 CAZY: GH_9 comprises enzymes with several known activities; endoglucanase (EC: 3.2.1.4); cellobiohydrolase (EC: 3.2.1.91). These enzymes were formerly known as cellulase family E.