Zhou, J. L., Hidaka, K., Futcher, B. (March 2000) The Est1 subunit of yeast telomerase binds the Tlc1 telomerase RNA. Molecular and Cellular Biology, 20 (6). pp. 1947-1955. ISSN 0270-7306
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Abstract
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.
| Item Type: | Paper |
|---|---|
| Uncontrolled Keywords: | SACCHAROMYCES-CEREVISIAE IN-VITRO CATALYTIC SUBUNIT TETRAHYMENA TELOMERASE MAMMALIAN TELOMERASE PROTEIN-COMPONENT DNA GENES REPEATS VIVO |
| Subjects: | bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > enzymes bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > enzymes > telomerase bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > telomeres organism description > yeast |
| CSHL Authors: | |
| Communities: | CSHL labs > Futcher lab |
| Depositing User: | Matt Covey |
| Date: | March 2000 |
| Date Deposited: | 31 Jan 2014 16:20 |
| Last Modified: | 31 Jan 2014 16:20 |
| PMCID: | PMC110812 |
| Related URLs: | |
| URI: | https://repository.cshl.edu/id/eprint/29385 |
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