Abstract
Phosphorylation of p53 on serine 15 by ATM or ATR is a frequent modification and initiates a cascade of post-translational modifications. To identify possible mechanisms that modulate p53 functions in recombination surveillance, we compared the nuclear localization of p53 phosphorylated on serine 15 (p53pSer15) and the key enzymes of homologous recombination (HR) after replication fork stalling. We demonstrate an almost mutually exclusive subcompartmentalization with Rad52, while p53pSer15 was colocalizing with 40–60% of the Rad51 and Mre11 foci. Therefore, possible sites of p53pSer15-dependent regulation seem to be sites of Rad51- rather than Rad52-dependent HR processes. Remarkably, the association of p53pSer15 with repair complexes containing Rad51 or Mre11 was transient, because less than 20% of the Rad51 and Mre11 foci overlapped with p53pSer15 after 6 h. When we examined colocalization and co-immunoprecipitation of p53pSer15 and the RecQ helicase BLM with recombination surveillance and proapoptotic functions, we observed colocalization within a fraction of approximately 70% of the BLM foci and stable physical interactions until 6 h after replication arrest. Our data suggest that p53pSer15 plays a dual role in the functional interactions with early complexes of Rad51-dependent recombination and with BLM-associated surveillance and signalling complexes within distinct nuclear subcompartments.
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Acknowledgements
We are grateful to Dr J Heukeshoven, Heinrich-Pette-Institut, Hamburg, Germany, for Rad52 peptide synthesis. We thank Dr Fiona E Benson and Professor Dr Stephen C West, Imperial Cancer Research Fund, Hertfordshire, UK, for the generous gift of the bacterial Rad52 expression vector. This work was supported by the Deutsche Forschungsgemeinschaft, Grant Wi 1376/3-1.
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Restle, A., Janz, C. & Wiesmüller, L. Differences in the association of p53 phosphorylated on serine 15 and key enzymes of homologous recombination. Oncogene 24, 4380–4387 (2005). https://doi.org/10.1038/sj.onc.1208639
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DOI: https://doi.org/10.1038/sj.onc.1208639
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