ID 2.4.1.179 DE lactosylceramide beta-1,3-galactosyltransferase. CA a beta-D-galactosyl-(1->4)-beta-D-glucosyl derivative + UDP-alpha-D- CA galactose = a beta-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-beta-D- CA glucosaminyl derivative + H(+) + UDP. CC -!- R may be an oligosaccharide or a glycolipid. CC -!- Lactose can also act as acceptor, more slowly. CC -!- Involved in the elongation of oligosaccharide chains, especially in CC glycolipids. //