A role for transcriptional repressors in targeting the yeast Swi/Snf complex.
Genetic and biochemical studies indicate that the evolutionarily conserved Swi/Snf complex acts at a subset of genes to help transcriptional activators function on chromatin templates. The mechanism by which this complex is targeted to specific chromosomal loci remains unknown. We show that Swi/Snf is required for expression of the yeast histone HTA1-HTB1 locus because of the role of Hir1p and Hir2p corepressors in negatively regulating transcription. Snf5p, Snf2p/Swi2p, and Swi3p, three components of the yeast Swi/Snf complex, coimmunoprecipitate with each Hir protein, and Snf5p is maximally associated with the HTA1-HTB1 promoter when the Hir-based repression system is intact and the Swi/Snf complex is functional. The data support a role for the Hir repressors in the gene-specific targeting of Swi/Snf.
Dimova
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Program in Molecular Biology, Sloan Kettering Cancer Center, New York, New York 10021, USA.
Nackerdien
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Furgeson
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Eguchi
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Osley
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D000251:Adenosine Triphosphatases; D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins / Q000235:genetics; D019143:Evolution, Molecular; D005656:Fungal Proteins / Q000235:genetics; D015966:Gene Expression Regulation, Fungal; D006657:Histones / Q000235:genetics*; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics; D011401:Promoter Regions, Genetic; D012097:Repressor Proteins / Q000235:genetics*; D000071796:SMARCB1 Protein; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors / Q000235:genetics; D014158:Transcription, Genetic / Q000235:genetics*
D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C078808:HIR1 protein, S cerevisiae; C078809:HIR2 protein, S cerevisiae; D006657:Histones; D009687:Nuclear Proteins; D012097:Repressor Proteins; D000071796:SMARCB1 Protein; C513266:SMARCB1 protein, human; C066190:SNF5 protein, S cerevisiae; C072981:SWI3 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors; D000251:Adenosine Triphosphatases; C499333:SNF2 protein, S cerevisiae