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 activity toward HIV envelope glycoprotein gp120, EA2, Muc2 and Muc5. Glycosylates FGF23 (By similarity). Probably glycosylates fibronectin in vivo. May be involved in phosphate homeostasis.
Golgi apparatus, Golgi stack membrane, Single-pass type II membrane protein
Glycosyltransferase 2 family, GalNAc-T subfamily
Highly expressed in the reproductive tract, principally in the testis and uterus, and to a lesser degree in the cervix with only trace levels in the ovary. Also expressed at high level in sublingual gland, stomach and colon, with more moderate amounts pre