The Q motif of fanconi anemia group J protein (FANCJ) DNA helicase regulates its dimerization, DNA binding, and DNA repair function

Yuliang Wu, Joshua A. Sommers, Jason A. Loiland, Hiroyuki Kitao, Jochen Kuper, Caroline Kisker, Robert M. Brosh

Research output: Contribution to journalArticle

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Abstract

The Q motif, conserved in a number of RNA and DNA helicases, is proposed to be important for ATP binding based on structural data, but its precise biochemical functions are less certain. FANCJ encodes a Q motif DEAH box DNA helicase implicated in Fanconi anemia and breast cancer. A Q25A mutation of the invariant glutamine in the Q motif abolished its ability to complement cisplatin or telomestatin sensitivity of a fancj null cell line and exerted a dominant negative effect. Biochemical characterization of the purified recombinant FANCJ-Q25A protein showed that the mutation disabled FANCJ helicase activity and the ability to disrupt protein-DNA interactions. FANCJ-Q25A showed impaired DNA binding and ATPase activity but displayed ATP binding and temperature-induced unfolding transition similar to FANCJ-WT. Size exclusion chromatography and sedimentation velocity analyses revealed that FANCJ-WT existed as molecular weight species corresponding to a monomer and a dimer, and the dimeric form displayed a higher specific activity for ATPase and helicase, as well as greater DNA binding. In contrast, FANCJ-Q25A existed only as a monomer, devoid of helicase activity. Thus, the Q motif is essential for FANCJ enzymatic activity in vitro and DNA repair function in vivo.

Original languageEnglish
Pages (from-to)21699-21716
Number of pages18
JournalJournal of Biological Chemistry
Volume287
Issue number26
DOIs
Publication statusPublished - Jun 22 2012

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DNA Helicases
Fanconi Anemia
Dimerization
DNA Repair
Repair
Adenosine Triphosphatases
DNA
Adenosine Triphosphate
RNA Helicases
Null Lymphocytes
Mutation
Proteins
Monomers
Glutamine
Cisplatin
Gel Chromatography
Size exclusion chromatography
Molecular Weight
Sedimentation
Dimers

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

The Q motif of fanconi anemia group J protein (FANCJ) DNA helicase regulates its dimerization, DNA binding, and DNA repair function. / Wu, Yuliang; Sommers, Joshua A.; Loiland, Jason A.; Kitao, Hiroyuki; Kuper, Jochen; Kisker, Caroline; Brosh, Robert M.

In: Journal of Biological Chemistry, Vol. 287, No. 26, 22.06.2012, p. 21699-21716.

Research output: Contribution to journalArticle

Wu, Yuliang ; Sommers, Joshua A. ; Loiland, Jason A. ; Kitao, Hiroyuki ; Kuper, Jochen ; Kisker, Caroline ; Brosh, Robert M. / The Q motif of fanconi anemia group J protein (FANCJ) DNA helicase regulates its dimerization, DNA binding, and DNA repair function. In: Journal of Biological Chemistry. 2012 ; Vol. 287, No. 26. pp. 21699-21716.
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