Abstract
Homologous recombination is essential for genetic exchange, meiosis and error-free repair of double-strand breaks1. Central to this process is Rad52, a conserved homo-oligomeric ring-shaped protein, which mediates the exchange of the early recombination factor RPA by Rad51 and promotes strand annealing2,3. Here, we report that Rad52 of Saccharomyces cerevisiae is modified by the ubiquitin-like protein SUMO, primarily at two sites that flank the conserved Rad52 domain. Sumoylation is induced on DNA damage and triggered by Mre11–Rad50–Xrs2 (MRX) complex-governed double-strand breaks (DSBs). Although sumoylation-defective Rad52 is largely recombination proficient, mutant analysis revealed that the SUMO modification sustains Rad52 activity and concomitantly shelters the protein from accelerated proteasomal degradation. Furthermore, our data indicate that sumoylation becomes particularly relevant for those Rad52 molecules that are engaged in recombination.
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Acknowledgements
We thank U. Cramer and J. Rech for technical assistance, and D. Bishop, J. Haber, L. Hartwell, R. Kanaar, F. Klein, H. L. Klein, N. Kleckner, M. Knop, S. Müller, N. Sugawara and L. S. Symington for materials and advice. This work is supported by the Max Planck Society, Deutsche Krebshhilfe, Deutsche Forschungsgemeinschaft and Fonds der chemischen Industrie.
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Supplementary Figures S1, S2, S3, S4, S5, Supplementary Table 1 and Supplementary Methods (PDF 2892 kb)
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Sacher, M., Pfander, B., Hoege, C. et al. Control of Rad52 recombination activity by double-strand break-induced SUMO modification. Nat Cell Biol 8, 1284–1290 (2006). https://doi.org/10.1038/ncb1488
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DOI: https://doi.org/10.1038/ncb1488
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