Component of the cytosolic iron-sulfur protein assembly (CIA) complex, a multiprotein complex that mediates the incorporation of iron-sulfur cluster into extramitochondrial Fe/S proteins. Seems to negatively regulate the level of HIF1A expression, although this effect could be indirect. External component of the CIA complex (PubMed:22678361, PubMed:22678362, PubMed:23585563). In the CIA complex, interacts directly with CIAO1 and MMS19 (PubMed:23585563). Widely expressed. Belongs to the NARF family.