Sodium-phosphate symporter which preferentially transports the monovalent form of phosphate with a stoichiometry of two sodium ions per phosphate ion (  , ). May play a role in extracellular matrix and cartilage calcification as well as in vascular calcification . Essential for cell proliferation but this function is independent of its phosphate transporter activity .
(Microbial infection) May function as a retroviral receptor as it confers human cells susceptibility to infection to Gibbon Ape Leukemia Virus (GaLV), Simian sarcoma-associated virus (SSAV) and Feline leukemia virus subgroup B (FeLV-B) as well as 10A1 murine leukemia virus (10A1 MLV).
Subcellular locations: Cell membrane
Ubiquitously expressed.