Holliday junctions (HJs) are key intermediates in homologous recombination and are especially important for the production of crossover recombinants1,2,3,4. Bacterial RecA family proteins promote the formation and branch migration of HJs in vitro by catalysing a reciprocal DNA-strand exchange reaction between two duplex DNA molecules, one of which contains a single-stranded DNA region that is essential for initial nucleoprotein filament formation5. This activity has been reported only for prokaryotic RecA family recombinases5, although eukaryotic homologues are also essential for HJ production in vivo6,7. Here we show that fission yeast (Rhp51) and human (hRad51) RecA homologues promote duplex–duplex DNA-strand exchange in vitro. As with RecA, a HJ is formed between the two duplex DNA molecules, and reciprocal strand exchange proceeds through branch migration of the HJ. In contrast to RecA, however, strand exchange mediated by eukaryotic recombinases proceeds in the 3′→5′ direction relative to the single-stranded DNA region of the substrate DNA. The opposite polarity of Rhp51 makes it especially suitable for the repair of DNA double-strand breaks, whose repair is initiated at the processed ends of breaks that have protruding 3′ termini1,2.
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We thank N. Haruta-Takahashi, T. Kokubo and K. Morikawa for discussions and encouragement, and T. Miyata for her help in electron microscopy sample preparation. This study was supported in part by Grants-in-Aid from the Ministry of Education, Culture, Sports, Science, and Technology (MECSST) of Japan and from the Japan Society for the Promotion of Science (JSPS), and by a grant from the 2007 Strategic Research Project of Yokohama City University.
Author Contributions Y.M., Y.K. and H.I. designed the experiments. Y.M. and Y.K. performed the experiments. K.M. performed the electron microscopy analysis. Y.M. and H.I. wrote the manuscript.
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Murayama, Y., Kurokawa, Y., Mayanagi, K. et al. Formation and branch migration of Holliday junctions mediated by eukaryotic recombinases. Nature 451, 1018–1021 (2008). https://doi.org/10.1038/nature06609
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