<p>O-Glycosyl hydrolases <db_xref db="EC" dbkey="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 [<cite idref="PUB00004870"/>, <cite idref="PUB00005266"/>]. This classification is available on the CAZy (CArbohydrate-Active EnZymes) web site.</p><p>Cellulases (Endoglucanases) <db_xref db="EC" dbkey="3.2.1.4"/> catalyse the endohydrolysis of 1,4-beta-D-glucosidic linkages in cellulose.This is the N-terminal ig-like domain of cellulase, enzymes containing this domain belong to family 9 of the glycoside hydrolases (<db_xref db="CAZY" dbkey="GH9"/>).</p> Glycoside hydrolase, family 9, N-terminal, Ig-like