Monothiol glutaredoxin involved in the biogenesis of iron-sulfur clusters (By similarity). Binds one iron-sulfur cluster per dimer. The iron-sulfur cluster is bound between subunits, and is complexed by a bound glutathione and a cysteine residue from each subunit (Probable). Homodimer. Heterodimer with FRA2. Present with 11000 molecules/cell in log phase SD medium. Belongs to the glutaredoxin family. Monothiol subfamily. Extended N-terminus.