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- Title
Distinct roles for yeast Stn1 in telomere capping and telomerase inhibition.
- Authors
Puglisi, Andrea; Bianchi, Alessandro; Lemmens, Laure; Damay, Pascal; Shore, David
- Abstract
The budding yeast Cdc13, Stn1 and Ten1 (CST) proteins are proposed to function as an RPA-like complex at telomeres that protects ('caps') chromosome ends and regulates their elongation by telomerase. We show that Stn1 has a critical function in both processes through the deployment of two separable domains. The N terminus of Stn1 interacts with Ten1 and carries out its essential capping function. The C terminus of Stn1 binds both Cdc13 and Pol12, and we present genetic data indicating that the Stn1-Cdc13 interaction is required to limit continuous telomerase action. Stn1 telomere association, similar to that of Cdc13, peaks during S phase. Significantly, the magnitude of Stn1 telomere binding is independent of telomere TG tract length, suggesting that the negative effect of Stn1 on telomerase action might be regulated by a modification of CST activity or structure in cis at individual telomeres. Genetic analysis suggests that the Tell kinase exerts an effect in parallel with the Stn1 C terminus to counteract its inhibition of telomerase. These data provide new insights into the coordination of telomere capping and telomerase regulation.
- Publication
The EMBO journal, 2008, Vol 27, Issue 17, p2328
- ISSN
0261-4189
- Publication type
Journal Article
- DOI
10.1038/emboj.2008.158