ID 2.4.1.146 DE beta-1,3-galactosyl-O-glycosyl-glycoprotein beta-1,3-N- DE acetylglucosaminyltransferase. AN elongation 3beta-GalNAc-transferase. AN O-glycosyl-oligosaccharide-glycoprotein N-acetylglucosaminyltransferase AN II. CA (1) 3-O-{beta-D-galactosyl-(1->3)-[N-acetyl-beta-D-glucosaminyl-(1->6)]- CA N-acetyl-alpha-D-galactosaminyl}-L-seryl-[protein] + UDP-N-acetyl-alpha- CA D-glucosamine = 3-O-{beta-D-GlcNAc-(1->3)-beta-D-Gal-(1->3)-[beta-D- CA GlcNAc-(1->6)]-alpha-D-GalNAc}-L-seryl-[protein] + H(+) + UDP. CA (2) 3-O-{beta-D-galactosyl-(1->3)-[N-acetyl-beta-D-glucosaminyl-(1->6)]- CA N-acetyl-alpha-D-galactosaminyl}-L-threonyl-[protein] + UDP-N-acetyl- CA alpha-D-glucosamine = 3-O-{beta-D-GlcNAc-(1->3)-beta-D-Gal-(1->3)-[beta- CA D-GlcNAc-(1->6)]-alpha-D-GalNAc}-L-threonyl-[protein] + H(+) + UDP. CC -!- The enzyme catalyzes the addition of N-acetyl-alpha-D-glucosamine to CC the core 2 structure of O-glycans. DR Q9Y2A9, B3GN3_HUMAN; Q5JCS9, B3GN3_MOUSE; //