Definition: An enzyme that catalyzes the hydrolysis of lactose into d-glucose and d-galactose, as well as the hydrolysis of other ß-d-galactosides; it also catalyzes galactotransferase reactions; a deficiency of ß-d-galactosidase leads to problems in the intestinal digestion of lactose; used in the production of milk products for adults who lack the intestinal enzyme; a defect of one isozyme of ß-d-galactosidase is associated with Morquio syndrome type B.
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Examples: glitazone, GI cocktail, etc.