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 (By similarity). External component of the CIA complex. In the CIA complex, interacts directly with CIAO1 and MMS19. Belongs to the NARF family.