Abstract
Human RAD51 and RAD54 are key players in homologous recombination, a process that requires homology recognition and strand invasion by a RAD51–single-stranded DNA (ssDNA) nucleoprotein filament and chromatin remodeling by RAD54. Here we use in vitro chromatin reconstitution systems to show that RAD51-ssDNA stimulates RAD54-dependent chromatin remodeling in a homology-dependent, polarity-independent manner. This stimulation was not seen with RAD54B or other remodelers. Chromatin remodeling by RAD54 enabled strand invasion by RAD51-ssDNA on nucleosomal templates, which was homology- and polarity-dependent. Three natural RAD54 mutants found in primary cancer cells showed specific defects in remodeling or in the RAD54-RAD51 interaction. We propose that RAD54 is recruited by RAD51-ssDNA filament to the chromatin of the intact chromosome and that it remodels that chromatin to facilitate accessibility for strand exchange.
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Acknowledgements
We thank R. Kanaar (Erasmus MC), J. Chen (University of Delaware) and K. Miyagawa (Hiroshima University) for plasmids pFASTBac1/6His-HHR54-HA, pTrcHisB/hRAD51 and pFASTBacHTc/6His-RAD54B, respectively, the members of the Kingston laboratory for critical comments and J. Garlick for help with the Sf9 cell culture. This work was supported by US National Institutes of Health, National Cancer Institute grant CA-093660 (H.-Y.F) and US National Institutes of Health grant GM48405 (R.E.K.).
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Z.Z. designed and executed the experiments. H.-Y.F. established and optimized the mononucleosome-related experiments. J.A.G. optimized the REA reactions on nucleosomal arrays. Z.Z. and R.E.K. interpreted the data and prepared the manuscript.
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Supplementary information
Supplementary Fig. 1
Recombinant proteins purified from Sf9 cells. (PDF 110 kb)
Supplementary Fig. 2
Control reactions for the remodeling activity of RAD54 and RAD54B. (PDF 276 kb)
Supplementary Fig. 3
RAD51-ssDNA enhances the chromatin-remodeling activity of RAD54 specifically. (PDF 101 kb)
Supplementary Fig. 4
Stoichiometry of RAD51-ssDNA stimulation to the remodeling of the G5E4 array by RAD54. (PDF 132 kb)
Supplementary Fig. 5
Nucleosome occupancy on the G5E4 circular chromatin. (PDF 157 kb)
Supplementary Fig. 6
The effects of different chromatin-remodeling enzymes on strand invasion by RAD51-ssDNA. (PDF 122 kb)
Supplementary Table 1
Vmax of ATP hydrolysis and Km for different substrates, derived from ATPase assays. (PDF 54 kb)
Supplementary Table 2
Sequences of oligonucleotides used for RAD51-ssDNA filament assembly. (PDF 50 kb)
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Zhang, Z., Fan, HY., Goldman, J. et al. Homology-driven chromatin remodeling by human RAD54. Nat Struct Mol Biol 14, 397–405 (2007). https://doi.org/10.1038/nsmb1223
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DOI: https://doi.org/10.1038/nsmb1223
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