Glycoside hydrolasesEC3.2.1. 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.[6][7]
Glycoside hydrolase family 44
CAZY GH_44, formerly known as cellulase family J, includes enzymes with
endoglucanaseEC3.2.1.4 and xyloglucanase
EC3.2.1.151 activities. The overall structure of enzymes in this family consists of a
TIM-like barrel domain, a beta-sandwich domain and an
active site with two
glutamic acid residues, all of which are conserved between the endoglucanases and xyloglucanases in the family, with only minor differences.[8][9]