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Hans-Knöll-Institut für Naturstoff-Forschung (S.W.)
07745 Jena, Germany
Division of Endocrinology (C.M.,
J.A.M.) Children’s Hospital Harvard Medical School Boston,
Massachusetts 02115
In general, DNA-binding factors that activate gene transcription are thought to do so via reversible interaction with DNA. However, most studies, largely performed in vitro, suggest that the transcriptional activator, cAMP response element-binding protein (CREB), is exceptional in that it is constitutively bound to the promoter, where its phosphorylation leads to the recruitment of CREB-binding protein (CBP) to form a CREB/CBP/promoter complex. We have studied how CREB interacts with DNA in vivo to regulate the cAMP-responsive gene encoding human CRH (hCRH). Protein-DNA complexes were cross-linked in cells expressing the endogenous hCRH gene by exposure to a 10 nsec pulse of high-energy UV-laser light, followed by immunoaffinity purification of CREB-DNA complexes. Binding of CREB to a fragment of the hCRH promoter containing a canonical, functional cAMP response element was absent in untreated cells, but was specifically induced after activation of the protein kinase A pathway with forskolin. These data indicate that, in vivo, CREB, like the majority of other DNA-binding transcriptional activators, undergoes signal-mediated promoter interaction.
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