ID 2.4.1.147 DE acetylgalactosaminyl-O-glycosyl-glycoprotein beta-1,3-N- DE acetylglucosaminyltransferase. AN Core 3beta-GlcNAc-transferase. AN O-glycosyl-oligosaccharide-glycoprotein N-acetylglucosaminyltransferase AN III. CA (1) 3-O-[N-acetyl-alpha-D-galactosaminyl]-L-threonyl-[protein] + UDP-N- CA acetyl-alpha-D-glucosamine = 3-O-[N-acetyl-beta-D-glucosaminyl-(1->3)-N- CA acetyl-alpha-D-galactosaminyl]-L-threonyl-[protein] + H(+) + UDP. CA (2) 3-O-[N-acetyl-alpha-D-galactosaminyl]-L-seryl-[protein] + UDP-N- CA acetyl-alpha-D-glucosamine = 3-O-[N-acetyl-beta-D-glucosaminyl-(1->3)-N- CA acetyl-alpha-D-galactosaminyl]-L-seryl-[protein] + H(+) + UDP. CC -!- The product of the enzyme is known as core 3, one of the eight core CC structures of mucin-type O-glycans. CC -!- O-Linked glycans are polysaccharides or oligosaccharides that are CC linked to a protein via the oxygen atom in the side chain of an CC L-serine or L-threonine residue. DR Q6ZMB0, B3GN6_HUMAN; Q3USF0, B3GN6_MOUSE; //