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. Required for the stability of the FhuF protein. Part of the SufBCD complex that contains SufB, SufC and SufD. Can form homodimers. Belongs to the UPF0051 (ycf24) family.