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
Thomas G
中科院分区:
生物学1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

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SIRT 1通过使p53去乙酰化来调节DNA损伤反应,从而抑制p53转录输出。在这里,我们证明了分选蛋白PACS-2调节SIRT 1介导的p53去乙酰化,以调节DNA损伤反应。PACS-2敲除细胞不能有效地进行p53诱导的细胞周期阻滞响应DNA损伤。因此,在PACS-2敲除细胞和Pacs-2−/−小鼠的胸腺细胞中,p53乙酰化都减少了,从而减弱了细胞周期蛋白依赖性激酶抑制剂p21(CDKN 1A)的诱导。SIRT 1抑制剂EX-527或SIRT 1敲低恢复PACS-2敲低细胞中的p53乙酰化和p21诱导以及p21依赖性细胞周期停滞。运输研究表明,细胞质PACS-2穿梭到细胞核,在那里它与SIRT 1相互作用,并抑制SIRT 1介导的p53去乙酰化。相应地,体外试验证明PACS-2直接抑制SIRT 1催化的p53去乙酰化。总之,这些发现将PACS-2鉴定为调节DNA损伤反应的SIRT 1-p53-p21轴的体内介体。
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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