Enables
beta-1,4-N-acetylgalactosaminyltransferase activity. Involved in positive regulation of Notch signaling pathway; protein glycosylation; and response to toxic substance. Predicted to be located in Golgi apparatus. Human ortholog(s) of this gene implicated in congenital disorder of glycosylation type IId and multiple sclerosis. Is an ortholog of human B4GALT1 (
beta-1,4-galactosyltransferase 1) and B4GALT3 (
beta-1,4-galactosyltransferase 3).