Transports uridine diphosphate galactose (UDP-galactose) from the cytosol into the Golgi apparatus, functioning as an antiporter that exchanges UDP-galactose for UMP (, ). It is also able to exchange UDP-galactose for AMP and CMP, and to transport UDP-N-acetylgalactosamine (UDP-GalNAc) and other nucleotide sugars (, ). As a provider of UDP-galactose to galactosyltransferases present in the Golgi apparatus, it is necessary for globotriaosylceramide/globoside (Gb3Cer) synthesis from lactosylceramide .
Subcellular locations: Endoplasmic reticulum membrane, Golgi apparatus membrane
Subcellular locations: Golgi apparatus membrane