Telomerase regulation by the Pif1 helicase: a length-dependent effect?

Telomerase regulation by the Pif1 helicase: a length-dependent effect? Dysfunctional telomere length regulation is detrimental to human health, and both activation and inhibition of telomerase have been proposed in potential therapies to treat human diseases. The Saccharomyces cerevisiae Pif1 protein is an evolutionarily conserved helicase that inhibits telomerase activity at DNA ends. Recent studies have indicated that Pif1 is specifically important for inhibiting telomerase at DNA ends with very little or no telomeric sequence and at long telomeres. At the former, Pif1 prevents the inappropriate addition of a telomere at DNA double-strand breaks. For the latter, Pif1 has been shown to bind long telomeres to presumably promote the extension of the short ones. These observations leave the impression that Pif1 does not act at DNA ends with telomeric sequence of intermediate length. Here, we provide in vivo evidence that Pif1 inhibits telomerase activity at DNA ends regardless of telomere sequence length. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Current Genetics Springer Journals

Telomerase regulation by the Pif1 helicase: a length-dependent effect?

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Publisher
Springer Journals
Copyright
Copyright © 2017 by The Author(s)
Subject
Life Sciences; Microbial Genetics and Genomics; Microbiology; Biochemistry, general; Cell Biology; Plant Sciences; Proteomics
ISSN
0172-8083
eISSN
1432-0983
D.O.I.
10.1007/s00294-017-0768-6
Publisher site
See Article on Publisher Site

Abstract

Dysfunctional telomere length regulation is detrimental to human health, and both activation and inhibition of telomerase have been proposed in potential therapies to treat human diseases. The Saccharomyces cerevisiae Pif1 protein is an evolutionarily conserved helicase that inhibits telomerase activity at DNA ends. Recent studies have indicated that Pif1 is specifically important for inhibiting telomerase at DNA ends with very little or no telomeric sequence and at long telomeres. At the former, Pif1 prevents the inappropriate addition of a telomere at DNA double-strand breaks. For the latter, Pif1 has been shown to bind long telomeres to presumably promote the extension of the short ones. These observations leave the impression that Pif1 does not act at DNA ends with telomeric sequence of intermediate length. Here, we provide in vivo evidence that Pif1 inhibits telomerase activity at DNA ends regardless of telomere sequence length.

Journal

Current GeneticsSpringer Journals

Published: Oct 20, 2017

References

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