N-acetyllactosamine synthase
N-acetyllactosamine synthase (EC 2.4.1.90) is a galactosyltransferase enzyme that catalyzes the chemical reaction: It forms the disaccharide, N-acetyllactosamine, by transferring the galactose group from UDP-galactose to a specific hydroxy group of N-acetyl-D-glucosamine, with uridine diphosphate (UDP) as a byproduct. The enzyme protein is a component of lactose synthase, which converts glucose to lactose but in this reaction is acting on an amide derivative of glucose.
Source: Wikipedia — N-acetyllactosamine synthase (CC BY-SA 4.0)