Predicted to enable calcium ion binding activity; manganese ion binding activity; and polypeptide N-acetylgalactosaminyltransferase activity. Acts upstream of or within protein O-linked glycosylation and spermatogenesis. Predicted to be located in perinuclear region of cytoplasm. Predicted to be active in Golgi apparatus. Is expressed in several structures, including alimentary system; brain; genitourinary system; respiratory system; and sensory organ. Used to study hyperphosphatemic familial tumoral calcinosis. Orthologous to human GALNT3 (polypeptide N-acetylgalactosaminyltransferase 3). [provided by Alliance of Genome Resources, Apr 2022]