... Identification of two cysteine residues involved in the binding of UDP-GalNAc to UDP-GalNAc: polypeptideN-acetylgalactosaminyltransferase 1 (GalNAc-T1) Mari Tenno 1 , Shinya Toba 1 , Fere´nc ... catalytic site of GalNAc-T1, might be involved in the catalytic function of the enzyme. To investigate whether the cysteine residues modified byPCMPS are involved in the binding of UDP-GalNAc, we ... sequenceincludes the GalNAc-T1 DXH motif (underlined above), aregion believed to be involved in coordination of a divalentcation or the binding of UDP-GalNAc [16 ,28,29]. The two cysteine residues in the...