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Blood, 1 October 2007, Vol. 110, No. 7, pp. 2390-2398.
Prepublished online as a Blood First Edition Paper on June 27, 2007; DOI 10.1182/blood-2006-11-057273.
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HEMATOPOIESIS
FANCJ (BACH1) helicase forms DNA damage inducible foci with replication protein A and interacts physically and functionally with the single-stranded DNA-binding protein
Rigu Gupta1,
Sudha Sharma1,
Joshua A. Sommers1,
Mark K. Kenny2,
Sharon B. Cantor3, and
Robert M. Brosh, Jr1
1 Laboratory of Molecular Gerontology, National Institute on Aging (NIA), National Institutes of Health (NIH), Baltimore, MD;
2 Department of Emergency Medicine, Albert Einstein College of Medicine, Montefiore Medical Center, Bronx, NY;
3 Department of Cancer Biology, University of Massachusetts Medical School, Worcester
The BRCA1 associated C-terminal helicase (BACH1, designated FANCJ) is implicated in the chromosomal instability genetic disorder Fanconi anemia (FA) and hereditary breast cancer. A critical role of FANCJ helicase may be to restart replication as a component of downstream events that occur during the repair of DNA cross-links or double-strand breaks. We investigated the potential interaction of FANCJ with replication protein A (RPA), a single-stranded DNA-binding protein implicated in both DNA replication and repair. FANCJ and RPA were shown to coimmunoprecipitate most likely through a direct interaction of FANCJ and the RPA70 subunit. Moreover, dependent on the presence of BRCA1, FANCJ colocalizes with RPA in nuclear foci after DNA damage. Our data are consistent with a model in which FANCJ associates with RPA in a DNA damage-inducible manner and through the protein interaction RPA stimulates FANCJ helicase to better unwind duplex DNA substrates. These findings identify RPA as the first regulatory partner of FANCJ. The FANCJ-RPA interaction is likely to be important for the role of the helicase to more efficiently unwind DNA repair intermediates to maintain genomic stability.
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