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J. Biol. Chem., Vol. 280, Issue 49, 40450-40464, December 9, 2005

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Acetylation of Poly(ADP-ribose) Polymerase-1 by p300/CREB-binding Protein Regulates Coactivation of NF-B-dependent Transcription^*

Paul O. Hassa, Sandra S. Haenni, Christine Buerki, Nadja I. Meier, William S. Lane, Heather Owen, Monika Gersbach, Ralph Imhof, and Michael O. Hottiger, Supported by the Kanton of Zurich1

From the Institute of Veterinary Biochemistry and Molecular Biology, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland and Harvard Microchemistry and Proteomics Analysis Facility, Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138

Poly(ADP-ribose) polymerase-1 (PARP-1) and nuclear factor B (NF-B) have both been demonstrated to play a pathophysiological role in a number of inflammatory disorders. We recently presented evidence that PARP-1 can act as a promoter-specific coactivator of NF-B in vivo independent of its enzymatic activity. PARP-1 directly interacts with p300 and both subunits of NF-B (p65 and p50) and synergistically coactivates NF-B-dependent transcription. Here we show that PARP-1 is acetylated in vivo at specific lysine residues by p300/CREB-binding protein upon stimulation. Furthermore, acetylation of PARP-1 at these residues is required for the interaction of PARP-1 with p50 and synergistic coactivation of NF-B by p300 and the Mediator complex in response to inflammatory stimuli. PARP-1 physically interacts with the Mediator. Interestingly, PARP-1 interacts in vivo with histone deacetylases (HDACs) 1-3 but not with HDACs 4-6 and might be deacetylated in vivo by HDACs 1-3. Thus, acetylation of PARP-1 by p300/CREB-binding protein plays an important regulatory role in NF-B-dependent gene activation by enhancing its functional interaction with p300 and the Mediator complex.

Received for publication, July 12, 2005 , and in revised form, September 28, 2005.

^* This work was supported in part by the Bonnizzi-Theler and Velux Foundation and the Swiss National Science Foundation Grant 31-67771.02. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

The on-line version of this article (available at http://www.jbc.org) contains supplemental material.

¹ To whom correspondence should be addressed: Institute of Veterinary Biochemistry and Molecular Biology, University of Zurich, Winterthurerstrasse 190, 8057 Zurich. Tel.: 41-44-635-54-74; Fax: 41-44-635-68-40; E-mail: hottiger{at}vetbio.unizh.ch.

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