Mitochondrial transporter that imports/exports pyrimidine nucleotides into and from mitochondria. Selectively transports cytosine, guanosine, inosine and uridine (deoxy)nucleoside mono-, di-, and triphosphates by antiport mechanism. Catalyzes uniport at much lower rate . May import (deoxy)nucleoside triphosphates in exchange for intramitochondrial (deoxy)nucleoside mono- and diphosphates, thus providing precursors necessary for de novo synthesis of mitochondrial DNA and RNA while exporting products of their catabolism . Participates in mitochondrial genome maintenance, regulation of mitochondrial membrane potential and mitochondrial respiration.
Subcellular locations: Mitochondrion inner membrane
Widely expressed at moderate level. Expressed most strongly in pancreas .