galactokinase /gəlak′tōkī″nās/ [Gk, gala, milk, kinesis, movement; Fr, diastase, enzyme] , an enzyme that functions in the metabolism of glycogen. Galactokinase catalyzes a metabolic step involving the transfer of a high-energy phosphate group from a donor molecule to a molecule of galactose, producing a molecule of d-galactose 1-phosphate.
