Function: Key component of the cytosolic iron-sulfur protein assembly (CIA) complex, a multiprotein complex that mediates the incorporation of iron-sulfur cluster into apoproteins specifically involved in DNA metabolism and genomic integrity. In the CIA complex, MMS19 acts as an adapter between early-acting CIA components and a subset of cellular target iron-sulfur proteins such as ERCC2/XPD, FANCJ and RTEL1, thereby playing a key role in nucleotide excision repair (NER) and RNA polymerase II (POL II) transcription. As part of the mitotic spindle-associated MMXD complex, plays a role in chromosome segregation, probably by facilitating iron-sulfur cluster assembly into ERCC2/XPD. Indirectly acts as a transcriptional coactivator of estrogen receptor (ER), via its role in iron-sulfur insertion into some component of the TFIIH-machinery. Ref.1 Ref.3 Ref.11 Ref.14 Ref.15
Subunit structure: Component of the CIA complex. Component of the MMXD complex, composed of CIAO1, ERCC2, FAM96B, MMS19 and SLC25A5. Interacts with FAM96B; the interaction is direct. Interacts with ERCC2/XPD; the interaction is direct. Interacts with ERCC3/XPB and NCOA3/RAC3. Ref.1 Ref.2 Ref.11 Ref.14 Ref.15
Subcellular location: Nucleus. Cytoplasm › cytoskeleton › spindle Ref.1 Ref.2 Ref.3 Ref.11 Ref.15.
Tissue specificity: Ubiquitously expressed with higher expression in testis. Ref.1 Ref.3
Sequence similarities: Belongs to the MET18/MMS19 family.Contains 7 HEAT repeats.
Sequence caution: The sequence AAH80532.1 differs from that shown. Reason: Erroneous translation. Wrong choice of CDS.The sequence BAB55315.1 differs from that shown. Reason: Erroneous initiation. Translation N-terminally extended.The sequence BAB71223.1 differs from that shown. Reason: Erroneous translation. Wrong choice of CDS.The sequence BAG51657.1 differs from that shown. Reason: Erroneous initiation. Translation N-terminally extended.The sequence CAC29239.1 differs from that shown. Reason: Frameshift at positions 373 and 412.
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