Part of the ABC transporter complex FbpABC involved in Fe(3+) ions import. Responsible for energy coupling to the transport system. ATP + Fe(3+)(out) + H2O = ADP + Fe(3+)(in) + H(+) + phosphate The complex is composed of two ATP-binding proteins (FbpC), two transmembrane proteins (FbpB) and a solute-binding protein (FbpA). In E.coli, the afu system seems to have been deleted by an insertion sequence. AfuA is totally lost, afuB is partially present and afuC is totally conserved. Belongs to the ABC transporter superfamily. Fe(3+) ion importer (TC 3.A.1.10) family. Extended N-terminus.