The multifunctional sorting protein PACS-2 regulates SIRT1-mediated deacetylation of p53 to modulate p21-dependent cell-cycle arrest.
The multifunctional sorting protein PACS-2 regulates SIRT1-mediated deacetylation of p53 to modulate p21-dependent cell-cycle arrest.
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DOI:
10.1016/j.celrep.2014.07.049
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发表时间:
2014-09-11
期刊:
影响因子:
8.8
通讯作者:
Thomas G
中科院分区:
文献类型:
--
作者:
Atkins KM;Thomas LL;Barroso-González J;Thomas L;Auclair S;Yin J;Kang H;Chung JH;Dikeakos JD;Thomas G
SIRT1 regulates the DNA damage response by deacetylating p53, thereby repressing p53 transcriptional output. Here we demonstrate that the sorting protein PACS-2 regulates SIRT1-mediated deacetylation of p53 to modulate the DNA damage response. PACS-2 knockdown cells failed to efficiently undergo p53-induced cell cycle arrest in response to DNA damage. Accordingly, p53 acetylation was reduced both in PACS-2 knockdown cells and thymocytes from Pacs-2−/− mice, thereby blunting induction of the cyclin-dependent kinase inhibitor p21 (CDKN1A). The SIRT1 inhibitor EX-527 or SIRT1 knockdown restored p53 acetylation and p21 induction as well as p21-dependent cell cycle arrest in PACS-2 knockdown cells. Trafficking studies revealed cytoplasmic PACS-2 shuttled to the nucleus where it interacted with SIRT1 and repressed SIRT1-mediated p53 deacetylation. Correspondingly, in vitro assays demonstrated PACS-2 directly inhibited SIRT1-catalyzed p53 deacetylation. Together, these findings identify PACS-2 as an in vivo mediator of the SIRT1—p53—p21 axis that modulates the DNA damage response.
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DOI:
10.1126/science.1231097
发表时间:
2013-03-08
期刊:
Science (New York, N.Y.)
影响因子:
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期刊:
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