Abstract
Homologous recombination (HR) and nonhomologous end joining (NHEJ) are two distinct DNA double-stranded break (DSB) repair pathways. Here, we report that DNA-dependent protein kinase (DNA-PK), the core component of NHEJ, partnering with DNA-damage checkpoint kinases ataxia telangiectasia mutated (ATM) and ATM- and Rad3-related (ATR), regulates HR repair of DSBs. The regulation was accomplished through modulation of the p53 and replication protein A (RPA) interaction. We show that upon DNA damage, p53 and RPA were freed from a p53–RPA complex by simultaneous phosphorylations of RPA at the N-terminus of RPA32 subunit by DNA-PK and of p53 at Ser37 and Ser46 in a Chk1/Chk2-independent manner by ATR and ATM, respectively. Neither the phosphorylation of RPA nor of p53 alone could dissociate p53 and RPA. Furthermore, disruption of the release significantly compromised HR repair of DSBs. Our results reveal a mechanism for the crosstalk between HR repair and NHEJ through the co-regulation of p53–RPA interaction by DNA-PK, ATM and ATR.
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Acknowledgements
We gratefully acknowledge Dr Xiaohua Wu for providing U2OS cells expressing RPA32-WT and PD-RPA proteins. We also gratefully acknowledge Dr Carl W Anderson for providing the p53-expression constructs (pCAG3.1-WT, -S15A, -S20A, -S37A and -S46A) and Dr Karen Vousden for the pCB6 expression vectors p53-WT and p53-S15A. This work is supported by National Institutes of Health grants CA86927 and GM083307 (to YZ) as well as ES017214 (to MAS).
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Serrano, M., Li, Z., Dangeti, M. et al. DNA-PK, ATM and ATR collaboratively regulate p53–RPA interaction to facilitate homologous recombination DNA repair. Oncogene 32, 2452–2462 (2013). https://doi.org/10.1038/onc.2012.257
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DOI: https://doi.org/10.1038/onc.2012.257
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