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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 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]
Glycoside hydrolase family 35 CAZY GH_35 comprises enzymes with only one known activity; beta-galactosidase (EC 3.2.1.23). Mammalian beta-galactosidase is a lysosomal enzyme (gene GLB1) which cleaves the terminal galactose from gangliosides, glycoproteins, and glycosaminoglycans and whose deficiency is the cause of the genetic disease Gm(1 ...
EC 3.2.1.20 : is associated with Glycogen storage disease type II: Beta-glucosidase # EC 3.2.1.21 : is associated with Gaucher's disease: Lactase: EC 3.2.1.23 : one member of the β-galactosidase family, breaks down milk sugars, and its absence in adulthood causes lactose intolerance: Debranching enzyme # EC 3.2.1.33
Glycoside hydrolase family 2 [8] comprises enzymes with several known activities: beta-galactosidase (EC 3.2.1.23); beta-mannosidase (EC 3.2.1.25); beta-glucuronidase (EC 3.2.1.31). These enzymes contain a conserved glutamic acid residue which has been shown, [ 9 ] in Escherichia coli lacZ ( P00722 ), to be the general acid/base catalyst in the ...
Senescence-associated beta-galactosidase, along with p16 Ink4A, is regarded to be a biomarker of cellular senescence. [ 1 ] [ 2 ] Its existence was proposed in 1995 by Dimri et al. [ 3 ] following the observation that when beta-galactosidase assays were carried out at pH 6.0, only cells in senescence state develop staining.
X-gal is an analog of lactose, and therefore may be hydrolyzed by the β-galactosidase enzyme which cleaves the β-glycosidic bond in D-lactose.X-gal, when cleaved by β-galactosidase, yields galactose and 5-bromo-4-chloro-3-hydroxyindole - 1.
Glycoside 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 glycoside hydrolases, based on sequence similarity, has led to the definition of >100 different families.
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