Journal
ISCIENCE
Volume 25, Issue 10, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.isci.2022.105115
Keywords
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Funding
- National Natural Science Foundation of China
- Priority Academic Program Development of Jiangsu Higher Education Institution (PARD)
- [U1632270]
- [U1967220]
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This study identified that RPRM regulates ATM protein levels and affects DNA repair and cellular radiosensitivity. The mechanism involves RPRM nuclear translocation through phosphorylation at serine 98 and the participation of IPO11. Additionally, RPRM overexpression sensitizes cells to genotoxic agents, while RPRM deficiency increases resistance to radiation-induced damage.
How the ataxia telangiectasia mutated (ATM) protein kinase, a core protein in DNA damage response, is regulated at post-transcription level remains unclear. Here it is identified that protein Reprimo (RPRM) downregulates ATM protein levels, resulting in impaired DNA repair and enhanced cellular radiosensitivity. Mechanistically, although primarily localized in the cytoplasm, RPRM translocates to the nucleus shortly after induced by X-irradiation, interacts with ATM and promotes its nuclear export and proteasomal degradation. The RPRM nuclear translocation involves its phosphorylation at serine 98 mediated by cyclin-dependent kinases 4/6 (CDK4/6), and requires Importin-11 (IPO11). Of importance, IPO11-regulated RPRM nuclear import upon irradiation is essential for its regulation on ATM. Thus, RPRM overexpression and its phosphorylation inhibition sensitize cells to genotoxic agents such as irradiation, whereas RPRM deficiency significantly increases resistance to radiation-induced damage both in vitro and in vivo. These findings establish a crucial regulatory mechanism in which ATM is negatively modulated by RPRM.
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