FecA is the outer membrane receptor protein in the Fe(3+) dicitrate transport system. For induction, the TonB and the ExbB proteins have to be active. Regulation by the iron level mediated by the Fur protein and induction by citrate plus iron suggest that the Fe(3+) dicitrate complex must enter the periplasm where it binds to a transmembrane protein, which regulates transcription of the fec genes directly or via a further inductor. Induced 2-fold by hydroxyurea (PubMed:20005847). Belongs to the TonB-dependent receptor family.