Transcriptional repression by the SMRT-mSin3 corepressor: multiple interactions, multiple mechanisms, and a potential role for TFIIB.
A variety of eukaryotic transcription factors, including the nuclear hormone receptors, Max-Mad, BCL-6, and PLZF, appear to mediate transcriptional repression through the ability to recruit a multiprotein corepressor complex to the target promoter. This corepressor complex includes the SMRT/N-CoR polypeptides, mSin3A or -B, and histone deacetylase 1 or 2. The presence of a histone-modifying activity in the corepressor complex has led to the suggestion that gene silencing is mediated by modification of the chromatin template, perhaps rendering it less accessible to the transcriptional machinery. We report here, however, that the corepressor complex actually appears to exhibit multiple mechanisms of transcriptional repression, only one of which corresponds with detectable recruitment of the histone deacetylase. We provide evidence instead of an alternative pathway of repression that may be mediated by direct physical interactions between components of the corepressor complex and the general transcription factor TFIIB.
Section of Microbiology, Division of Biological Sciences, University of California at Davis, Davis, California 95616, USA.
C W
CW
Wong
M L
ML
Privalsky
D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000378:metabolism*; D005656:Fungal Proteins / Q000096:biosynthesis; D005982:Glutathione Transferase / Q000096:biosynthesis; D006655:Histone Deacetylases / Q000378:metabolism; D007700:Kinetics; D056985:Nuclear Receptor Co-Repressor 2; D011401:Promoter Regions, Genetic; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis; D012097:Repressor Proteins / Q000096:biosynthesis / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D056264:Sin3 Histone Deacetylase and Corepressor Complex; D035581:Transcription Factor TFIIB; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic; D014162:Transfection
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C052130:GAL4 protein, S cerevisiae; D056985:Nuclear Receptor Co-Repressor 2; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; C099683:SIN3A transcription factor; D029701:Saccharomyces cerevisiae Proteins; D035581:Transcription Factor TFIIB; D014157:Transcription Factors; D005982:Glutathione Transferase; D006655:Histone Deacetylases; D056264:Sin3 Histone Deacetylase and Corepressor Complex