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© Melanie Blokesch, EPFL
Flagellated Vibrio cholerae
Publication : The EMBO journal

RPA facilitates telomerase activity at chromosome ends in budding and fission yeasts.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The EMBO journal - 18 Apr 2012

Luciano P, Coulon S, Faure V, Corda Y, Bos J, Brill SJ, Gilson E, Simon MN, Géli V,

Link to Pubmed [PMID] – 22354040

Link to DOI – 10.1038/emboj.2012.40

EMBO J 2012 Apr; 31(8): 2034-46

In Saccharomyces cerevisiae, the telomerase complex binds to chromosome ends and is activated in late S-phase through a process coupled to the progression of the replication fork. Here, we show that the single-stranded DNA-binding protein RPA (replication protein A) binds to the two daughter telomeres during telomere replication but only its binding to the leading-strand telomere depends on the Mre11/Rad50/Xrs2 (MRX) complex. We further demonstrate that RPA specifically co-precipitates with yKu, Cdc13 and telomerase. The interaction of RPA with telomerase appears to be mediated by both yKu and the telomerase subunit Est1. Moreover, a mutation in Rfa1 that affects both the interaction with yKu and telomerase reduces the dramatic increase in telomere length of a rif1Δ, rif2Δ double mutant. Finally, we show that the RPA/telomerase association and function are conserved in Schizosaccharomyces pombe. Our results indicate that in both yeasts, RPA directly facilitates telomerase activity at chromosome ends.