Golgi apparatus membrane; Single-pass type II membrane protein .
Tissue Expression
Ubiquitous. Highly expressed in mucous cells.
Signaling_pathway
Research Areas
Function
Catalyzes the initial reaction in O-linked oligosaccharide biosynthesis, the transfer of an N-acetyl-D-galactosamine residue to a serine or threonine residue on the protein receptor. Has a highest activity toward Muc7, EA2 and Muc2, with a lowest activity than GALNT2. Glycosylates 'Thr-57' of SELPLG.