Sodium-independent sulfate anion transporter (, ). Can transport other anions including bicarbonate, thiosulfate and oxalate by mediating sulfate-thiosulfate, sulfate-hydrogencarbonate and sulfate-oxalate anion exchange (, ). Mediates oxalate-hydrogencarbonate anion exchange (By similarity).
Subcellular locations: Cell membrane, Basolateral cell membrane
Expressed most abundantly in the kidney and liver, with lower levels in the pancreas, testis, brain, small intestine, colon, and lung.