Targeted recruitment of the Sin3-Rpd3 histone deacetylase complex generates a highly localized domain of repressed chromatin in vivo.
Eukaryotic organisms contain a multiprotein complex that includes Rpd3 histone deacetylase and the Sin3 corepressor. The Sin3-Rpd3 complex is recruited to promoters by specific DNA-binding proteins, whereupon it represses transcription. By directly analyzing the chromatin structure of a repressed promoter in yeast cells, we demonstrate that transcriptional repression is associated with localized histone deacetylation. Specifically, we observe decreased acetylation of histones H3 and H4 (preferentially lysines 5 and 12) that depends on the DNA-binding repressor (Ume6), Sin3, and Rpd3. Mapping experiments indicate that the domain of histone deacetylation is highly localized, occurring over a range of one to two nucleosomes. Taken together with previous observations, these results define a novel mechanism of transcriptional repression which involves targeted recruitment of a histone-modifying activity and localized perturbation of chromatin structure.
Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.
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D002843:Chromatin / Q000235:genetics* / Q000378:metabolism; D002874:Chromosome Mapping; D004794:Enzyme Repression; D005656:Fungal Proteins / Q000378:metabolism; D006655:Histone Deacetylases / Q000096:biosynthesis* / Q000235:genetics*; D006657:Histones / Q000378:metabolism; D008239:Lysine; D009707:Nucleosomes / Q000235:genetics / Q000378:metabolism; D011401:Promoter Regions, Genetic; D012097:Repressor Proteins / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic
D002843:Chromatin; D005656:Fungal Proteins; D006657:Histones; D009707:Nucleosomes; D012097:Repressor Proteins; C071731:SIN3 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; C071665:RPD3 protein, S cerevisiae; D006655:Histone Deacetylases; D008239:Lysine