UniProt Summary: Transfers glucuronic acid (GlcUA) from UDP-GlcUA to N- acetylgalactosamine residues on the non-reducing end of the elongating chondroitin polymer. Has no N- acetylgalactosaminyltransferase activity. {ECO:0000269|PubMed:12145278, ECO:0000269|PubMed:18316376}.