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β-Galactosidase (EC 3.2.1.23, beta-gal or β-gal; systematic name β-D-galactoside galactohydrolase) is a glycoside hydrolase enzyme that catalyzes hydrolysis of terminal non-reducing β-D-galactose residues in β-D-galactosides. (This enzyme digests many β-Galactosides, not just lactose.
The galactosidases are categorized as either alpha or beta, according to the category of glycoside they hydrolyze. The enzyme corresponding to an alpha-galactoside is called alpha-galactosidase; it catalyzes the hydrolysis of substrates that contain α-galactosidic residues, such as glycosphingolipids or glycoproteins. [1]
The glycosyl hydrolase 42 family CAZY GH_42 comprises beta-galactosidase enzymes (EC 3.2.1.23). These enzyme catalyse the hydrolysis of terminal, non-reducing terminal beta-D-galactoside residues. The middle domain of these three-domain enzymes is involved in trimerisation. [8]
Senescence-associated beta-galactosidase (SA-β-gal or SABG) is a hypothetical hydrolase enzyme that catalyzes the hydrolysis of β-galactosides into monosaccharides. Senescence-associated beta-galactosidase, along with p16 Ink4A , is regarded to be a biomarker of cellular senescence .
α-Galactosidase ( EC 3.2.1.22, α-GAL, α-GAL A; systematic name α-D-galactoside galactohydrolase) is a glycoside hydrolase enzyme that catalyses the following reaction: [1] Hydrolysis of terminal, non-reducing α- D -galactose residues in α- D -galactosides, including galactose oligosaccharides, galactomannans and galactolipids
A galactoside is a glycoside containing galactose. The H of the OH group on carbon-1 of galactose is replaced by an organic moiety. [1] Structure of ONPG, an example of a β-galactoside. Depending on whether the glycosidic bond lies "above" or "below" the plane of the galactose molecule, galactosides are classified as α-galactosides or β ...
Galactosidase, beta 1, also known as GLB1, is a protein which in humans is encoded by the GLB1 gene. [ 5 ] [ 6 ] The GLB1 protein is a beta-galactosidase that cleaves the terminal beta- galactose from ganglioside substrates and other glycoconjugates. [ 7 ]
In molecular biology, Glycoside hydrolase family 2 is a family of glycoside hydrolases EC 3.2.1., which 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 ...