The periplasmic binding proteins from bacterial phosphite ATP-binding cassette transporters are involved in the uptake of phosphorus compounds, which are essential for cell structure, metabolism and signaling. In many natural habitats the availability of inorganic phosphate is low enough to limit microbial growth, and under these phosphate-depleted conditions some bacteria utilize phosphite as an alternative source of phosphorus.

protein – ion interaction | ABC transporters | phosphite | His₆-tag | MO-P-045