acetylgalactosaminyltransferase activity glucuronosyl-N-acetylgalactosaminyl-proteoglycan 4-beta-N-acetylgalactosaminyltransferase activity https://github.com/geneontology/go-ontology/issues/30193 N-acetylgalactosaminyltransferase II activity chondroitin synthase activity glucuronyl-N-acetylgalactosaminylproteoglycan beta-1,4-N-acetylgalactosaminyltransferase activity Reactome:R-HSA-1971487 EC:2.4.1.175 molecular_function Catalysis of the reaction: D-glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan + UDP-N-acetylgalactosamine = N-acetyl-D-galactosaminyl-1,4-beta-D-glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan + UDP. glucuronyl-N-acetylgalactosaminylproteoglycan 4-beta-N-acetylgalactosaminyltransferase activity UDP-N-acetyl-D-galactosamine:beta-D-glucuronosyl-(1->3)-N-acetyl-beta-D-galactosaminyl-proteoglycan 4-beta-N-acetylgalactosaminyltransferase activity MetaCyc:RXN-16325 Reactome:R-HSA-9632033 Reactome:R-HSA-1971482 Reactome:R-HSA-3595176 UDP-N-acetyl-D-galactosamine:D-glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan beta-1,4-N-acetylgalactosaminyltransferase activity GO:0047238 uridine diphosphoacetylgalactosamine-chondroitin acetylgalactosaminyltransferase II activity