In molecular biology, glycoside hydrolase family 31 is a family of glycoside hydrolases.
Glycoside 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 glycoside hydrolases, based on sequence similarity, has led to the definition of >100 different families. This classification is available on the CAZy web site, and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes.
Glycoside hydrolase family 31 CAZY GH_31 comprises enzymes with several known activities; alpha-glucosidase (), alpha-galactosidase (); glucoamylase (), sucrase-isomaltase () (); alpha-xylosidase (); alpha-glucan lyase ().
Glycoside hydrolase family 31 groups a number of glycosyl hydrolases on the basis of sequence similarities An aspartic acid has been implicated in the catalytic activity of sucrase, isomaltase, and lysosomal alpha-glucosidase.