Cited by 112DNA Repair MechanismsDNA and Nucleic Acid ChemistryProtein Structure and Dynamics

FANCJ Uses Its Motor ATPase to Destabilize Protein-DNA Complexes, Unwind Triplexes, and Inhibit RAD51 Strand Exchange

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Sommers, Joshua A., Rawtani, Nina, Gupta, Rigu, Bugreev, Dmitry V., Mazin, Alexander V., Cantor, Sharon B., Brosh, Robert M.·2009·Journal of Biological Chemistry

Abstract

Mutations in the FANCJ helicase predispose individuals to breast cancer and are genetically linked to the Fanconi anemia (FA) complementation group J. FA is a chromosomal instability disorder characterized by multiple congenital anomalies, progressive bone marrow failure, and high cancer risk. FANCJ has been proposed to function downstream of FANCD2 monoubiquitination, a critical event in the FA pathway. Evidence supports a role for FANCJ in a homologous recombination pathway of double strand break repair. In an effort to understand the molecular functions of FANCJ, we have investigated the ability of purified FANCJ recombinant protein to use its motor ATPase function for activities in addition to unwinding of conventional duplex DNA substrates. These efforts have led to the discovery that FANCJ ATP hydrolysis can be used to destabilize protein-DNA complexes and unwind triple helix alternate DNA structures. These novel catalytic functions of FANCJ may be important for its role in cellular DNA repair, recombination, or resolving DNA structural obstacles to replication. Consistent with this, we show that FANCJ can inhibit RAD51 strand exchange, an activity that is likely to be important for its role in controlling DNA repair through homologous recombination.

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Crossref · 10.1074/jbc.m809019200

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  • The breast cancer-associated P47A mutation and the FA-associated A349P mutation reduce FANCJ enzyme activity.

    “Consistent with enzyme activity being essential for tumor suppression, the breast cancer-associated mutation in helicase block II (P47A) or an FA-associated mutation in the Fe–S domain (A349P) reduced FANCJ enzyme activity [42,56,63].”
  • The breast cancer-associated M299I mutant unwound a forked duplex DNA substrate and translocated DNA more robustly than wild-type FANCJ.

    “For example, the breast cancer-associated M299I mutant protein unwound a forked duplex DNA substrate and translocated DNA more robustly than wild-type FANCJ (Figure 2) [62,63].”

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Authors
Sommers, J. A., Rawtani, N., Gupta, R., Bugreev, D. V., Mazin, A. V., Cantor, S. B., & Brosh, R. M.
Affiliations
  • National Institutes of Health (US)
  • Institute of Chemical Biology and Fundamental Medicine (RU)
  • Drexel University (US)
  • University of Massachusetts Chan Medical School (US)
Corresponding author
Brosh, Robert M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-03
Volume
284
Issue
12
Pages
7505-7517
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2006575165
Cited by
112
References
48
Citations by year
2025: 5 · 2024: 6 · 2023: 6 · 2022: 2 · 2021: 5 · 2020: 4 · 2019: 3 · 2018: 9 · 2017: 5 · 2016: 6 · 2015: 9 · 2014: 9 · 2013: 4 · 2012: 8
FWCI
5.23
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of Mental Health (MH084119, R03MH084119)
  • National Cancer Institute (CA100839)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
FANCJ, helicase, Fanconi anemia, FANCD2 monoubiquitination, homologous recombination, DNA repair, breast cancer predisposition, chromosomal instability
MeSH terms
Adenosine Triphosphatases, Adenosine Triphosphate, DNA, DNA Repair, DNA Replication, Female, Humans, Hydrolysis, Recombination, Genetic, Basic-Leucine Zipper Transcription Factors, Rad51 Recombinase, Fanconi Anemia Complementation Group Proteins, DNA Breaks, Double-Stranded

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