Binds and transfers iron-sulfur (Fe-S) clusters to target apoproteins. Can hydrolyze ATP. Negatively regulates the expression of hpr/scoC. The effect on hpr/scoC may be indirect. Homodimer (By similarity). Interacts with BrxC (PubMed:33722570). Autoregulated. Belongs to the Mrp/NBP35 ATP-binding proteins family.