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Molecular and Cellular Biology, December 2001, p. 7892-7900, Vol. 21, No. 23
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.23.7892-7900.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Chromatin-Dependent Cooperativity between Constitutive and Inducible Activation Domains in CREB

Hiroshi Asahara,1 Buyung Santoso,2 Ernesto Guzman,1 Keyong Du,1 Philip A. Cole,3 Irwin Davidson,4 and Marc Montminy1,*

Peptide Biology Laboratories, Salk Institute for Biological Studies, La Jolla, California 92037-10021; Section of Molecular Biology and Center for Molecular Genetics, University of California San Diego, La Jolla, California 92093-03472; Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland 212053; and Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP 67404 Illkirch Cedex France4

Received 19 March 2001/Returned for modification 14 June 2001/Accepted 28 August 2001

The cyclic AMP (cAMP)-responsive factor CREB induces target gene expression via constitutive (Q2) and inducible (KID, for kinase-inducible domain) activation domains that function synergistically in response to cellular signals. KID stimulates transcription via a phospho (Ser133)-dependent interaction with the coactivator paralogs CREB binding protein and p300, whereas Q2 recruits the TFIID complex via a direct association with hTAFII130. Here we investigate the mechanism underlying cooperativity between the Q2 domain and KID in CREB by in vitro transcription assay with naked DNA and chromatin templates containing the cAMP-responsive somatostatin promoter. The Q2 domain was highly active on a naked DNA template, and Ser133 phosphorylation had no additional effect on transcriptional initiation in crude extracts. Q2 activity was repressed on a chromatin template, however, and this repression was relieved by the phospho (Ser133) KID-dependent recruitment of p300 histone acetyltransferase activity to the promoter. In chromatin immunoprecipitation assays of NIH 3T3 cells, cAMP-dependent recruitment of p300 to the somatostatin promoter stimulated acetylation of histone H4. Correspondingly, overexpression of hTAFII130 potentiated CREB activity in cells exposed to cAMP, but had no effect on reporter gene expression in unstimulated cells. We propose that cooperativity between the KID and Q2 domains proceeds via a chromatin-dependent mechanism in which recruitment of p300 facilitates subsequent interaction of CREB with TFIID.


* Corresponding author. Mailing address: Salk Institute, 10010 N. Torrey Pines Rd. La Jolla, CA 92037. Phone: (858) 453-4100, ext. 1394. Fax: (858) 625-9045. E-mail: montminy{at}salk.edu.


Molecular and Cellular Biology, December 2001, p. 7892-7900, Vol. 21, No. 23
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.23.7892-7900.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.



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