Predicted to enable polypeptide N-acetylgalactosaminyltransferase activity. Predicted to act upstream of or within protein O-linked glycosylation. Predicted to be located in Golgi membrane. Predicted to be integral component of membrane. Predicted to be active in Golgi apparatus. Orthologous to human GALNT7 (polypeptide N-acetylgalactosaminyltransferase 7). [provided by Alliance of Genome Resources, Apr 2022]