Part of the ABC transporter complex FhuBGCD involved in iron(3+)-hydroxamate import. Responsible for energy coupling to the transport system (By similarity). ATP + H2O + Fe(3+)-hydroxamate complex-[hydroxamate-binding protein]Side 1 = ADP + phosphate + Fe(3+)-hydroxamate complexSide 2 + [hydroxamate-binding protein]Side 1. The complex is composed of an ATP-binding protein (FhuC), two transmembrane proteins (FhuB and FhuG) and a solute-binding protein (FhuD or YxeB). Belongs to the ABC transporter superfamily. Iron (Fe3+)-hydroxamate importer (TC 3.A.1.14.7) family.