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Protection of telomeres by a conserved Stn1-Ten1 complex.

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Title: Protection of telomeres by a conserved Stn1-Ten1 complex.
Authors: Martin, Victoria1, Li-Lin Du1, Rozenzhak, Sophie1, Russell, Paul1,2 prussell@scripps.edu
Source: Proceedings of the National Academy of Sciences of the United States of America. 8/28/2007, Vol. 104 Issue 35, p14038-14043. 6p. 4 Diagrams.
Subjects: Telomeres, Chromosomes, DNA, Proteins, Schizosaccharomyces pombe
Abstract: Telomeres are specialized chromatin structures that protect chromosome ends. Critical among telomere proteins are those that bind the telomeric single-strand DNA (ssDNA) overhangs. These proteins are thought to differ among eukaryotes. Three interacting proteins (Cdc13, Stn1, and Ten1) associate with the telomeric overhang in budding yeast, a single protein known as Pot1 (protection of telomeres-1) performs this function in fission yeast, and a two-subunit complex consisting of POT1 and TPP1 associates with telomeric ssDNA in humans. Cdc13 and Pot1 have related oligonucleotide/oligosaccharide-binding fold (OB-fold) domains that bind the telomeric ssDNA overhang. Here we show that Schizosaccharomyces pombe has Stn1- and Ten1-like proteins that are essential for chromosome end protection. Stn1 orthologs exist in all species that have Pot1, whereas Ten1-like proteins can be found in all fungi. Fission yeast Stn1 and Ten1 localize at telomeres in a manner that correlates with the length of the ssDNA overhang, suggesting that they specifically associate with the telomeric ssDNA. Unlike in budding yeast, in which Cdc13, Stn1, and Ten1 all interact, fission yeast Stn1 and Ten1 associate with each other, but not with Pot1. Our findings suggest that two separate protein complexes are required for chromosome end protection in fission yeast. Structural profiling studies detect OB-fold domains in Stn1 and Ten1 orthologs, indicating that protection of telomeres by multiple proteins with OB-fold domains is conserved in eukaryotic evolution. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Protection of telomeres by a conserved Stn1-Ten1 complex.
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  Data: <searchLink fieldCode="AR" term="%22Martin%2C+Victoria%22">Martin, Victoria</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Li-Lin+Du%22">Li-Lin Du</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rozenzhak%2C+Sophie%22">Rozenzhak, Sophie</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Russell%2C+Paul%22">Russell, Paul</searchLink><relatesTo>1,2</relatesTo><i> prussell@scripps.edu</i>
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  Data: <searchLink fieldCode="DE" term="%22Telomeres%22">Telomeres</searchLink><br /><searchLink fieldCode="DE" term="%22Chromosomes%22">Chromosomes</searchLink><br /><searchLink fieldCode="DE" term="%22DNA%22">DNA</searchLink><br /><searchLink fieldCode="DE" term="%22Proteins%22">Proteins</searchLink><br /><searchLink fieldCode="DE" term="%22Schizosaccharomyces+pombe%22">Schizosaccharomyces pombe</searchLink>
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  Label: Abstract
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  Data: Telomeres are specialized chromatin structures that protect chromosome ends. Critical among telomere proteins are those that bind the telomeric single-strand DNA (ssDNA) overhangs. These proteins are thought to differ among eukaryotes. Three interacting proteins (Cdc13, Stn1, and Ten1) associate with the telomeric overhang in budding yeast, a single protein known as Pot1 (protection of telomeres-1) performs this function in fission yeast, and a two-subunit complex consisting of POT1 and TPP1 associates with telomeric ssDNA in humans. Cdc13 and Pot1 have related oligonucleotide/oligosaccharide-binding fold (OB-fold) domains that bind the telomeric ssDNA overhang. Here we show that Schizosaccharomyces pombe has Stn1- and Ten1-like proteins that are essential for chromosome end protection. Stn1 orthologs exist in all species that have Pot1, whereas Ten1-like proteins can be found in all fungi. Fission yeast Stn1 and Ten1 localize at telomeres in a manner that correlates with the length of the ssDNA overhang, suggesting that they specifically associate with the telomeric ssDNA. Unlike in budding yeast, in which Cdc13, Stn1, and Ten1 all interact, fission yeast Stn1 and Ten1 associate with each other, but not with Pot1. Our findings suggest that two separate protein complexes are required for chromosome end protection in fission yeast. Structural profiling studies detect OB-fold domains in Stn1 and Ten1 orthologs, indicating that protection of telomeres by multiple proteins with OB-fold domains is conserved in eukaryotic evolution. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1073/pnas.0705497104
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        Text: English
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      – SubjectFull: Telomeres
        Type: general
      – SubjectFull: Chromosomes
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      – SubjectFull: DNA
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      – SubjectFull: Proteins
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      – TitleFull: Protection of telomeres by a conserved Stn1-Ten1 complex.
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              M: 08
              Text: 8/28/2007
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              Y: 2007
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