Co-chaperone required for the assembly of iron-sulfur (Fe/S) clusters in mitochondria. Stimulates the ATPase activity of its specialized Hsp70 chaperone partner SSQ1. Binds to the substrate protein ISU1 and targets it to SSQ1. May function together with SSQ1 in the dislocation of the Fe/S cluster from ISU1 and its insertion into apoproteins. {ECO:0000269|PubMed:11171977, ECO:0000269|PubMed:11273703, ECO:0000269|PubMed:11278728, ECO:0000269|PubMed:12756240, ECO:0000269|PubMed:12970193, ECO:0000269|PubMed:15123690, ECO:0000269|PubMed:16431909, ECO:0000269|PubMed:16551614, ECO:0000269|PubMed:9813017}.
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