Glycoside hydrolase, family 20, C-terminal <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>This short domain is found in members of the glycoside hydrolase family 20 (<db_xref db="CAZY" dbkey="GH20"/>) and represents the C-terminal domain in chitobiases and beta-hexosaminidases <db_xref db="EC" dbkey="3.2.1.52"/>. It is composed of a beta sandwich structure [<cite idref="PUB00007713"/>]. The function of this domain is unknown.