Part of the ABC transporter complex FhuBGCD involved in iron(3+)-hydroxamate import. Responsible for the translocation of the substrate across the membrane (By similarity). 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 binding-protein-dependent transport system permease family. FecCD subfamily.