DOI: 10.1101/gad.9.3.370. Action of a RAP1 carboxy-terminal silencing domain reveals an underlying competition between HMR and telomeres in yeast.

Action of a RAP1 carboxy-terminal silencing domain reveals an underlying competition between HMR and telomeres in yeast.

10.1101/gad.9.3.370

Crossref journal-article

Cold Spring Harbor Laboratory

Genes & Development (246)

Abstract

RAP1 is a sequence-specific DNA-binding protein in yeast that can either repress or activate transcription. Previous studies have demonstrated a direct role for RAP1 in silencing at HM mating-type loci and telomeres. Here, we show that a small carboxy-terminal domain of RAP1 is sufficient to establish repression when fused to the GAL4 DNA-binding domain (GBD) and targeted to mutated HMR silencers containing GAL4 DNA-binding sites. Silencing by GBD/RAP1 hybrids, like normal silencing at HMR, requires the trans-acting factors SIR2, SIR3, and SIR4. However, GBD/RAP1-mediated silencing is independent of SIR1, whose product is normally required for the establishment of repression at HMR. Targeted silencing also displays an unusual response to silencing-defective rap1s mutations. The incorporation of a rap1s missense mutation into GBD/RAP1 hybrids can improve targeted silencing, yet wild-type GBD/RAP1 hybrids fail to establish repression in strains in which the endogenous RAP1 locus carries a rap1s mutation. In addition, we find that telomeric silencing is increased in rap1s strains. We propose that the rap1s mutation creates an HMR-specific silencing defect by shifting a balance between silencing at HMR and telomeres in favor of telomeric silencing. This balance is regulated by telomere length and by interactions between the RAP1 carboxyl terminus and both RIF1 and SIR4 proteins. In support of this model, we show that abnormally long telomeres antagonize silencing at HMR and a rap1s hybrid protein displays a strengthened interaction with SIR4 in a two-hybrid assay.

Bibliography

Buck, S. W., & Shore, D. (1995). Action of a RAP1 carboxy-terminal silencing domain reveals an underlying competition between HMR and telomeres in yeast. Genes & Development, 9(3), 370â384.

Authors 2

S W Buck (first)
D Shore (additional)

References 49 Referenced 164

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{'key': '2021111418203528000_9.3.370.9', 'first-page': '210', 'article-title': 'Two DNA-binding factors recognize specific sequences at silencers, upstream activating sequences, autonomously replicating sequences, and telomeres in Saccharomyces cerevisiae.', 'volume': '8', 'year': '1988', 'journal-title': 'Mol. Cell. Biol.'} / Mol. Cell. Biol. / Two DNA-binding factors recognize specific sequences at silencers, upstream activating sequences, autonomously replicating sequences, and telomeres in Saccharomyces cerevisiae. (1988)
{'key': '2021111418203528000_9.3.370.10', 'first-page': '5086', 'article-title': 'Connections between transcriptional activators, silencers, and telomeres as revealed by functional analysis of a yeast DNA-binding protein.', 'volume': '8', 'year': '1988', 'journal-title': 'Mol. Cell. Biol.'} / Mol. Cell. Biol. / Connections between transcriptional activators, silencers, and telomeres as revealed by functional analysis of a yeast DNA-binding protein. (1988)
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{'key': '2021111418203528000_9.3.370.28', 'first-page': '5159', 'article-title': 'C-terminal truncation of RAP1 results in the deregulation of telomere size, stability, and function in Saccharomyces cerevisiae.', 'volume': '12', 'year': '1992', 'journal-title': 'Mol. Cell. Biol.'} / Mol. Cell. Biol. / C-terminal truncation of RAP1 results in the deregulation of telomere size, stability, and function in Saccharomyces cerevisiae. (1992)
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Dates

Type	When
Created	18 years, 2 months ago (June 5, 2007, 5:15 p.m.)
Deposited	3 years, 9 months ago (Nov. 14, 2021, 9:30 p.m.)
Indexed	6 days, 16 hours ago (Aug. 19, 2025, 7:03 a.m.)
Issued	30 years, 6 months ago (Feb. 1, 1995)
Published	30 years, 6 months ago (Feb. 1, 1995)
Published Online	30 years, 6 months ago (Feb. 1, 1995)
Published Print	30 years, 6 months ago (Feb. 1, 1995)

Funders 0

None

BibTeX

@article{Buck_1995, title={Action of a RAP1 carboxy-terminal silencing domain reveals an underlying competition between HMR and telomeres in yeast.}, volume={9}, ISSN={1549-5477}, url={http://dx.doi.org/10.1101/gad.9.3.370}, DOI={10.1101/gad.9.3.370}, number={3}, journal={Genes & Development}, publisher={Cold Spring Harbor Laboratory}, author={Buck, S W and Shore, D}, year={1995}, month=feb, pages={370–384} }

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  "resource": {
    "primary": {
      "URL": "http://genesdev.cshlp.org/lookup/doi/10.1101/gad.9.3.370"
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  "container-title-short": "Genes Dev.",
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}