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Mol Cell. 2008 Nov 7;32(3):449-55. doi: 10.1016/j.molcel.2008.09.018.

The SIRT2 deacetylase regulates autoacetylation of p300.

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  • 1Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, BSRB 351A, 615 Charles E. Young Drive South, Los Angeles, CA 90095-1737, USA.

Abstract

Autoacetylation of the p300 histone acetyltransferase controls the transition between VP16-mediated chromatin acetylation and preinitiation complex (PIC) assembly. Currently, it is unknown if and how autoacetylated p300 is deacetylated. We found that the NAD(+)-dependent histone deacetylase SIRT2 deacetylates p300 in vitro and in cells. SIRT2 deacetylates lysine residues in the catalytic domain of p300 and restores binding of p300 to the PIC. RNAi-mediated depletion or chemical inhibition of SIRT2 in cells results in accumulation of acetylated p300. The altered ac-p300/p300 ratio in SIRT2-depleted cells results in decreased p300 recruitment to an integrated VP16-responsive gene and inhibition of transcription. We conclude that p300 undergoes a dynamic cycle of autoacetylation and deacetylation.

PMID:
18995842
[PubMed - indexed for MEDLINE]
PMCID:
PMC2645867
Free PMC Article

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