. "The sulfation is at the 6-position of N-acetylgalactosamine residues of chondroitin. Not identical with |FRAME: CHONDROITIN-4-SULFOTRANSFERASE-RXN \"EC 2.8.2.5\"| chondroitin 4-sulfotransferase."^^ . . . . . . . "[chondroitin]-N-acetyl-galactosamine + phosphoadenosine-5'-phosphosulfate → [chondroitin]-6-O-sulfo-N-acetylgalactosamine + adenosine 3',5'-bisphosphate + H+"^^ . "[chondroitin]-N-acetyl-galactosamine + phosphoadenosine-5'-phosphosulfate → [chondroitin]-6-O-sulfo-N-acetylgalactosamine + adenosine 3',5'-bisphosphate + H⁺"^^ . "2.8.2.17"^^ . . . . . . . . . . . "[chondroitin]-N-acetyl-galactosamine + phosphoadenosine-5'-phosphosulfate → [chondroitin]-6-O-sulfo-N-acetylgalactosamine + adenosine 3',5'-bisphosphate + H+"^^ .