Functions as a Na(+)-independent bidirectional multispecific transporter. Contributes to the renal and hepatic elimination of endogenous organic compounds from the systemic circulation into the urine and bile, respectively. Capable of transporting a wide range of purine and pyrimidine nucleobases, nucleosides and nucleotides, with cGMP, 2'deoxyguanosine and GMP being the preferred substrates. Functions as a pH- and chloride-independent cGMP bidirectional facilitative transporter that can regulate both intracellular and extracellular levels of cGMP and may be involved in cGMP signaling pathways. Mediates orotate/glutamate bidirectional exchange and most likely display a physiological role in hepatic release of glutamate into the blood. Involved in renal secretion and possible reabsorption of creatinine. Able to uptake prostaglandin E2 (PGE2) and may contribute to PGE2 renal excretion. Also transports alpha-ketoglutarate and urate. Apart from the orotate/glutamate exchange, the counterions for the uptake of other SLC22A7/OAT2 substrates remain to be identified.
Subcellular locations: Basolateral cell membrane, Apical cell membrane, Cell membrane