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Alpha-galactosidase is an enzyme, which is derived from the fungus Aspergillus niger. Itâs a homodimeric glycoprotein and it hydrolyzes the terminal alpha-galactosyl moieties (in chemistry moiety is defined as a functional group on a molecule) from glycolipids and glycoproteins.
Definition. Classic galactosemia type I is a metabolic disorder. It causes a low level or lack of an enzyme called galactose-1-phosphate uridyltransferase. This enzyme changes galactose to glucose. Galactose is a simple sugar found in milk products. Glucose is the usable form of sugar in the human body.