Predicted to enable antiporter activity and pyrimidine nucleotide-sugar transmembrane transporter activity. Acts upstream of or within energy homeostasis and positive regulation of protein exit from endoplasmic reticulum. Located in early endosome and endoplasmic reticulum. Is expressed in midbrain mantle layer and thymus primordium. Orthologous to human SLC35D3 (solute carrier family 35 member D3). [provided by Alliance of Genome Resources, Apr 2022]