Iron transporter, which is required for the synthesis of bacterial magnetic particles (BMPs). Probably involved in the transport of iron from the environment into the cytoplasm across the cell membrane, and then from the cytoplasm into the BMP lipid vesicle across the BMP membrane. Present in the cell and bacterial magnetic particle membranes. Induced by low iron concentrations. Belongs to the monovalent cation:proton antiporter 2 (CPA2) transporter (TC 2.A.37) family.