title: Dimeric ligands define a role for transcriptional activation domains in reinitiation.
abstract: Eukaryotic transcriptional activators mediate transcriptional induction through stabilization of the preinitiation complex, probably through direct interactions with basal transcription factors. In vitro studies on the role of an activator in the maintenance of on-going transcription (reinitiation) have been contradictory, suggesting that, after formation of a preinitiation complex, an activator may or may not be necessary for transcription to be maintained. We have developed a means of regulating transcription in living cells through the use of both homodimeric and heterodimerizing synthetic ligands that allow the ligand-dependent association and disassociation of a transcriptional activation domain with a promoter. Here we report that maintaining the transcription of endogenous genes in vivo, in both yeast and human cells, requires the continuous presence of the activation domain. The use of synthetic ligands as a transcriptional on-off switch represents a powerful means of controlling the transcription in vitro and in vivo for both experimental and therapeutic purposes.
authors: Department of Pathology, Howard Hughes Medical Institute, Stanford University School of Medicine, California 94305, USA.
authors: S N
authors: SN
authors: Ho
authors: S R
authors: SR
authors: Biggar
authors: D M
authors: DM
authors: Spencer
authors: S L
authors: SL
authors: Schreiber
authors: G R
authors: GR
authors: Crabtree
mesh_terms: D000469:Alkaline Phosphatase / Q000235:genetics; D001665:Binding Sites; D019703:Calcineurin; D002148:Calmodulin-Binding Proteins / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D019281:Dimerization; D017930:Genes, Reporter; D006360:Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism; D006801:Humans; D019169:Jurkat Cells; D008024:Ligands; D010749:Phosphoprotein Phosphatases / Q000378:metabolism; D011090:Polyenes / Q000494:pharmacology; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics; D020123:Sirolimus; D016559:Tacrolimus / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D022021:Tacrolimus Binding Proteins; D014157:Transcription Factors / Q000737:chemistry / Q000502:physiology*; D014158:Transcription, Genetic / Q000502:physiology*; D015533:Transcriptional Activation / Q000502:physiology*; D014162:Transfection
chemical_list: D002148:Calmodulin-Binding Proteins; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C084260:FK 1012; D006360:Heat-Shock Proteins; D008024:Ligands; D011090:Polyenes; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; D004247:DNA; D000469:Alkaline Phosphatase; D019703:Calcineurin; D010749:Phosphoprotein Phosphatases; D022021:Tacrolimus Binding Proteins; D020123:Sirolimus; D016559:Tacrolimus