Predicted to enable pyrimidine nucleotide-sugar transmembrane transporter activity. Predicted to be involved in pyrimidine nucleotide-sugar transmembrane transport. Predicted to be located in Golgi membrane. Is an ortholog of C. elegans nstp-4. In C. elegans, nstp-4 is involved in UDP-N-acetylgalactosamine transmembrane transport and UDP-N-acetylglucosamine transmembrane transport.