Lactase
Definition:
EC Tree > 3 Hydrolases > 3.2 Glycosylases > 3.2.1 Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds > 3.2.1.108 lactase
Lactase is an intestinal brush-border beta-galactosidase that hydrolyses lactose into beta-D-galactose and D-glucose; the intestinal-mucosa enzyme contains two glycosyl-hydrolase-family-1 domains, the first carrying the lactase activity described here and the second carrying glycosylceramidase activity (EC 3.2.1.62) (cf. amylo-alpha-1,6-glucosidase EC 3.2.1.33). By digesting milk lactose it enables the neonatal utilisation of dairy sugar, and its down-regulation after weaning causes adult lactose intolerance. It is distributed across Eukaryota and Bacteria.
Lactase is an intestinal brush-border beta-galactosidase that hydrolyses lactose into beta-D-galactose and D-glucose; the intestinal-mucosa enzyme contains two glycosyl-hydrolase-family-1 domains, the first carrying the lactase activity described here and the second carrying glycosylceramidase activity (EC 3.2.1.62) (cf. amylo-alpha-1,6-glucosidase EC 3.2.1.33). By digesting milk lactose it enables the neonatal utilisation of dairy sugar, and its down-regulation after weaning causes adult lactose intolerance. It is distributed across Eukaryota and Bacteria.
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