Glutathione-dependent oxidoreductase; mitochondrial matrix protein and subunit of an iron-sulfur assembly complex with Bol1p acting at a late stage in iron-sulfur center biogenesis; acts as a central hub in iron-sulfur cluster intermediate trafficking within mitochondria and export to the cytoplasm; hydroperoxide and superoxide-radical responsive; monothiol glutaredoxin subfamily member along with Grx3p and Grx4p