This family consists of several mammalian galactose-3-O-sulfotransferase proteins. Gal-3-O-sulfotransferase is thought to play a critical role in 3'-sulfation of N-acetyllactosamine in both O- and N-glycans [1].

1: Molecular cloning and expression of a novel human beta-Gal-3-O-sulfotransferase that acts preferentially on N-acetyllactosamine in N- and O-glycans. Suzuki A, Hiraoka N, Suzuki M, Angata K, Misra AK, McAuliffe J, Hindsgaul O, Fukuda M; J Biol Chem 2001;276:24388-24395. PMID:11323440