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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Rep 2014 ; 8 (5): 1545-57 Nephropedia Template TP
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The multi-functional sorting protein PACS-2 regulates SIRT1-mediated deacetylation of p53 to modulate p21-dependent cell cycle arrest #MMPMID25159152
Atkins KM; Thomas LL; Barroso-González J; Thomas L; Auclair S; Yin J; Kang H; Chung JH; Dikeakos JD; Thomas G
Cell Rep 2014[Sep]; 8 (5): 1545-57 PMID25159152show ga
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.