Important for the resorption of phosphate by the kidney. May be involved in actively transporting phosphate into cells via Na(+) cotransport in the renal brush border membrane. Plays a role in urate transport in the kidney (PubMed:27906618). Interacts with PDZK1. Expressed in kidney cortex, liver and brain but not in other tissues. Belongs to the major facilitator superfamily. Sodium/anion cotransporter family. It is uncertain whether Met-1 or Met-3 is the initiator.