Multi-faceted Properties of B4GalT1 Beta-1,4-Galactosyltransferase 1 (B4GalT1) belongs to the galactosyltransferase (GalT) family of enzymes that transfer galactose from uridine-diphosphate-α-D-galactose (UDP-Gal) to an acceptor sugar molecule. B4GalT1 is a critical enzyme in galactose metabolism. One of the first GalT to be characterized biochemically, B4GalT1, was also involved in lactose production by interacting with α-lactalbumin during