Involved in the uptake of iron. Part of the ABC transporter complex FeuABC/YusV involved in import of the catecholate siderophores bacillibactin and enterobactin. The complex is composed of one ATP-binding protein (YusV), two transmembrane proteins (FeuB and FeuC) and a solute-binding protein (FeuA). Present in detergent-resistant membrane (DRM) fractions that may be equivalent to eukaryotic membrane rafts; these rafts include proteins involved in signaling, molecule trafficking and protein secretion. Repressed by fur. Induced by Btr in iron-limited conditions. Strains lacking this gene show a reduction in growth stimulation by the catecholate siderophores enterobactin and bacillibactin. Belongs to the bacterial solute-binding protein 8 family.