Active Site

Glycoside hydrolase, family 2, active site (IPR023232)

Short name: Glyco_hydro_2_AS


O-Glycosyl 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 glycosyl hydrolases, based on sequence similarity, has led to the definition of 85 different families [PMID: 7624375, PMID: 8535779]. This classification is available on the CAZy (CArbohydrate-Active EnZymes) web site.

Glycoside hydrolase 2 GH2 comprises enzymes with several known activities; beta-galactosidase (EC:; beta-mannosidase (EC:; beta-glucuronidase (EC:

These enzymes contain a conserved glutamic acid residue which has been shown [PMID: 1350782], in Escherichia coli lacZ (P00722), to be the general acid/base catalyst in the active site of the enzyme.

This pattern signature contains the active site glutamic acid residue.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE patterns