Provides the ATPase subunit for at least 2 ABC transporter complexes; YfiYZ/YfhA/YusV involved in import of the iron-hydroxamate siderophores schizokinen, arthrobactin and corprogen (Probable), and FeuABC/YusV involved in import of the catecholate siderophores bacillibactin and enterobactin (Probable). Probably responsible for energy coupling to the transport system (By similarity). The iron-hydroxamate siderophore complex is composed of one ATP-binding protein (YusV), two transmembrane proteins (YfiZ and YfhA) and a solute-binding protein (YfiY); the catechoplate siderophore complex is composed of one ATP-binding protein (YusV), two transmembrane proteins (FeuB and FeuC) and a solute-binding protein (FeuA). Induced by iron starvation, partially repressed by fur. Strains lacking this gene show a reduction in growth stimulation by the iron-hydroxamate siderophores schizokinen and arthrobactin compared to wild-type. They also show a reduction in growth stimulation by the catecholate siderophores enterobactin and bacillibactin. Belongs to the ABC transporter superfamily.