title: Chromatin-dependent cooperativity between constitutive and inducible activation domains in CREB.
abstract: 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 hTAF(II)130. 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.
authors.affiliation: Peptide Biology Laboratories, Salk Institute for Biological Studies, La Jolla, California 92037-1002, USA.
authors.forename: H
authors.initials: H
authors.lastname: Asahara
authors.forename: B
authors.initials: B
authors.lastname: Santoso
authors.forename: E
authors.initials: E
authors.lastname: Guzman
authors.forename: K
authors.initials: K
authors.lastname: Du
authors.forename: P A
authors.initials: PA
authors.lastname: Cole
authors.forename: I
authors.initials: I
authors.lastname: Davidson
authors.forename: M
authors.initials: M
authors.lastname: Montminy
mesh_terms: D000818:Animals; D050882:CREB-Binding Protein; D002460:Cell Line; D002474:Cell-Free System; D002843:Chromatin / Q000378:metabolism*; D000242:Cyclic AMP / Q000819:agonists / Q000378:metabolism; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism*; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D050881:E1A-Associated p300 Protein; D005656:Fungal Proteins / Q000235:genetics; D005786:Gene Expression Regulation / Q000187:drug effects / Q000502:physiology*; D017930:Genes, Reporter; D005822:Genetic Vectors / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D051379:Mice; D009687:Nuclear Proteins / Q000378:metabolism; D010766:Phosphorylation; D011485:Protein Binding / Q000502:physiology; D017434:Protein Structure, Tertiary / Q000502:physiology; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D029701:Saccharomyces cerevisiae Proteins; D035381:TATA-Binding Protein Associated Factors; D015534:Trans-Activators / Q000378:metabolism; D035362:Transcription Factor TFIID; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D019473:Transcription Factors, TFII / Q000378:metabolism; D014162:Transfection
chemical_list: D002843:Chromatin; D017362:Cyclic AMP Response Element-Binding Protein; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C052130:GAL4 protein, S cerevisiae; D009687:Nuclear Proteins; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; C106785:TAF1 protein, S cerevisiae; C101882:TAF4 protein, human; C523528:TAF4 protein, mouse; D035381:TATA-Binding Protein Associated Factors; D015534:Trans-Activators; D035362:Transcription Factor TFIID; D014157:Transcription Factors; D019473:Transcription Factors, TFII; D004247:DNA; D000242:Cyclic AMP; D050882:CREB-Binding Protein; C494363:CREBBP protein, human; C494364:Crebbp protein, mouse; C494365:Crebbp protein, rat; D050881:E1A-Associated p300 Protein; C494361:Ep300 protein, mouse; C494362:Ep300 protein, rat