Catalyzes the transfer of Gal to GlcNAc-based acceptors with a preference for the core3 O-linked glycan GlcNAc(beta1,3)GalNAc structure. Can use glycolipid LC3Cer as an efficient acceptor. globoside Gb4Cer (d18:1(4E)) + UDP-alpha-D-galactose = globoside GalGb4Cer (d18:1(4E)) + H(+) + UDP Protein modification; protein glycosylation. Expressed in stomach, jejunum, colon, pancreas, small intestine, testis and gastrointestinal and pancreatic cancer cell lines. Hardly detected in lung, liver, adrenal gland and peripheral blood leukocytes. Belongs to the glycosyltransferase 31 family. Beta-1,3-galactosyltransferase 5