galactosyltransferase , which functions as the catalytic component of lactose synthase and in the glycosylation of glycoproteins , has been previously reported to have an absolute dependence on mn2+ for activity , with a kd for mn2+ ( 10 ( -3 ) m ) 2 to 3 orders of magnitude greater than the physiological range of mn2+ concentrations ( v 10 ( -6 ) m ) .
C0016964
galactosyltransferase
C0017982
glycoproteins