Component of the cytosolic iron-sulfur (Fe/S) protein assembly (CIA) machinery (PubMed:18573874). Required for maturation of extramitochondrial Fe-S proteins (PubMed:18573874). The NUBP1-NUBP2 heterotetramer forms a Fe-S scaffold complex, mediating the de novo assembly of an Fe-S cluster and its transfer to target apoproteins (PubMed:18573874). Implicated in the regulation of centrosome duplication (By similarity). Negatively regulates cilium formation and structure (By similarity). {ECO:0000250|UniProtKB:Q9R060, ECO:0000269|PubMed:18573874}. This is the function of NUBP1 (NUBP iron-sulfur cluster assembly factor 1, cytosolic, Ensembl gene identifier ENSG00000103274).