Component of the cytosolic iron-sulfur (Fe/S) protein assembly (CIA) machinery. Required for maturation of extramitochondrial Fe-S proteins. 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. Negatively regulates cilium formation and structure. Binds 4 [4Fe-4S] clusters per heterotetramer. Contains two stable clusters in the N-termini of NUBP1 and two labile, bridging clusters between subunits of the NUBP1-NUBP2 heterotetramer. Heterotetramer of 2 NUBP1 and 2 NUBP2 chains. Interacts with KIFC1. Interacts with NUBP1. Enriched at the centrosomes during mitosis. Enriched in centrioles of microtubule asters during prophase, prometaphase and telophase stages of mitosis (By similarity). Localized at centrioles and in the nucleus at interphase (By similarity). Colocalizes with nubp-1 at prometaphase (By similarity). Belongs to the Mrp/NBP35 ATP-binding proteins family. NUBP2/CFD1 subfamily.