May be involved in specific transport of UDP-Gal from the cytosol to the Golgi lumen. Involved in the maintenance of optimal conditions for the folding of secretory pathway proteins in the endoplasmic reticulum (By similarity). There are two genes coding for HUT1 in strain JEC21, due to a translocation and segmental duplication on chromosomes 8 and 12. Belongs to the nucleotide-sugar transporter family. SLC35B subfamily.