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Molecular and Cellular Biology, December 2001, p. 7892-7900, Vol. 21, No. 23
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.
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
*
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.
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