The SufBCD complex acts synergistically with SufE to stimulate the cysteine desulfurase activity of SufS. The SufBCD complex contributes to the assembly or repair of oxygen-labile iron-sulfur clusters under oxidative stress. May facilitate iron uptake from extracellular iron chelators under iron limitation. Part of the SufBCD complex that contains SufB, SufC and SufD (PubMed:12941942). Interacts with SufA (PubMed:19810706). Belongs to the UPF0051 (ycf24) family.