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 31 CAZY: GH_31 comprises enzymes with several known activities; alpha-glucosidase (EC: 3.2.1.20), alpha-galactosidase (EC: 3.2.1.22); glucoamylase (EC: 3.2.1.3), sucrase-isomaltase (EC: 3.2.1.48) (EC: 3.2.1.10); alpha-xylosidase (EC: 3.2.1.-); alpha-glucan lyase (EC: 4.2.2.13).

Glycoside hydrolase family 31 groups a number of glycosyl hydrolases on the basis of sequence similarities [PMID:1747104, PMID:1761061, PMID:1743281] An aspartic acid has been implicated [PMID:1856189] in the catalytic activity of sucrase, isomaltase, and lysosomal alpha-glucosidase.