May act either alone or in interaction with glutaredoxin as a redox-regulated transcriptional regulator, or as a factor regulating Fe-S cluster biogenesis. Interacts in vitro with GRXS14, GRXS15, GRXS16 and GRXS17, but not with GRXC5 (PubMed:24203231). Interacts in vivo only with GRXS14, GRXS15 and GRXS16 (PubMed:24203231). Belongs to the bolA/yrbA family.