In molecular biology, Glycoside hydrolase family 17 is a family of glycoside hydrolases.

Glycoside 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 glycoside hydrolases, based on sequence similarity, has led to the definition of >100 different families.

[1][2][3] This classification is available on the CAZy web site,[4][5] and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes.

Currently these enzymes have only been found in plants and in fungi.