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Molecular and Cellular Biology, March 2000, p. 1947-1955, Vol. 20, No. 6
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The Est1 Subunit of Yeast Telomerase Binds the Tlc1 Telomerase RNA

Jianlong Zhou,1 Kyoko Hidaka,2 and Bruce Futcher1,*

Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724,1 and Department of Bioscience, National Cardiovascular Center Research Institute, Suita, Osaka 565-8565, Japan2

Received 21 October 1999/Returned for modification 3 December 1999/Accepted 14 December 1999

Est1 is a component of yeast telomerase, and est1 mutants have senescence and telomere loss phenotypes. The exact function of Est1 is not known, and it is not homologous to components of other telomerases. We previously showed that Est1 protein coimmunoprecipitates with Tlc1 (the telomerase RNA) as well as with telomerase activity. Est1 has homology to Ebs1, an uncharacterized yeast open reading frame product, including homology to a putative RNA recognition motif (RRM) of Ebs1. Deletion of EBS1 results in short telomeres. We created point mutations in a putative RRM of Est1. One mutant was unable to complement either the senescence or the telomere loss phenotype of est1 mutants. Furthermore, the mutant protein no longer coprecipitated with the Tlc1 telomerase RNA. Mutants defective in the binding of Tlc1 RNA were nevertheless capable of binding single-stranded TG-rich DNA. Our data suggest that an important role of Est1 in the telomerase complex is to bind to the Tlc1 telomerase RNA via an RRM. Since Est1 can also bind telomeric DNA, Est1 may tether telomerase to the telomere.

* Corresponding author. Mailing address: Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724. Phone: (516) 367-8333 or (516) 367-8828. Fax: (516) 367-8369. E-mail: futcher{at}cshl.org.

Molecular and Cellular Biology, March 2000, p. 1947-1955, Vol. 20, No. 6
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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