Probable inactive glycosyltransferase. There are two conserved domains in the glycosyltransferase region: the N-terminal domain (domain A, also called GT1 motif), which is probably involved in manganese coordination and substrate binding and the C-terminal domain (domain B, also called Gal/GalNAc-T motif), which is probably involved in catalytic reaction and UDP-Gal binding. The ricin B-type lectin domain binds to GalNAc and contributes to the glycopeptide specificity. Belongs to the glycosyltransferase 2 family. GalNAc-T subfamily. Although strongly related to polypeptide N-acetylgalactosaminyltransferase proteins, it lacks the conserved Asp-Xaa-His motif in positions 199-201 and the conserved His residue in position 330 which are involved in the binding to the cofactor Mn(2+). This suggests that it may have lost its activity.