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. 2000 Feb;154(2):573–586. doi: 10.1093/genetics/154.2.573

Roles for the Saccharomyces cerevisiae SDS3, CBK1 and HYM1 genes in transcriptional repression by SIN3.

S Dorland 1, M L Deegenaars 1, D J Stillman 1
PMCID: PMC1460964  PMID: 10655212

Abstract

The Saccharomyces cerevisiae Sin3 transcriptional repressor is part of a large multiprotein complex that includes the Rpd3 histone deacetylase. A LexA-Sin3 fusion protein represses transcription of promoters with LexA binding sites. To identify genes involved in repression by Sin3, we conducted a screen for mutations that reduce repression by LexA-Sin3. One of the mutations identified that reduces LexA-Sin3 repression is in the RPD3 gene, consistent with the known roles of Rpd3 in transcriptional repression. Mutations in CBK1 and HYM1 reduce repression by LexA-Sin3 and also cause defects in cell separation and altered colony morphology. cbk1 and hym1 mutations affect some but not all genes regulated by SIN3 and RPD3, but the effect on transcription is much weaker. Genetic analysis suggests that CBK1 and HYM1 function in the same pathway, but this genetic pathway is separable from that of SIN3 and RPD3. The remaining gene from this screen described in this report is SDS3, previously identified in a screen for mutations that increase silencing at HML, HMR, and telomere-linked genes, a phenotype also seen in sin3 and rpd3 mutants. Genetic analysis demonstrates that SDS3 functions in the same genetic pathway as SIN3 and RPD3, and coimmunoprecipitation experiments show that Sds3 is physically present in the Sin3 complex.

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Selected References

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