Key component of the cytosolic iron-sulfur protein assembly (CIA) machinery that mediates the incorporation of iron-sulfur cluster into apoproteins specifically involved in DNA metabolism and genomic integrity. Acts as an adapter between early-acting CIA components and a subset of cellular target iron-sulfur proteins such as rad3/xpd and dna2, thereby playing a key role in nucleotide excision repair (NER) and RNA polymerase II (POL II) transcription (By similarity). Belongs to the MET18/MMS19 family.