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Related Experiment Videos

Telomerase in yeast

M Cohn1, E H Blackburn

  • 1Department of Microbiology and Immunology, University of California, San Francisco 94143-0414, USA.

Science (New York, N.Y.)
|July 21, 1995
PubMed
Summary
This summary is machine-generated.

Researchers identified and characterized telomerase activities in two yeast species. Saccharomyces cerevisiae telomerase showed low processivity and high stalling, explaining its irregular telomere sequences.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Telomerase is a ribonucleoprotein enzyme crucial for synthesizing telomeric DNA.
  • Telomeres protect chromosome ends, and their maintenance is vital for genomic stability.
  • Different yeast species exhibit distinct telomeric sequence patterns.

Purpose of the Study:

  • To identify and characterize the telomerase activities in Saccharomyces castellii and Saccharomyces cerevisiae.
  • To investigate the enzymatic properties and genetic requirements of S. cerevisiae telomerase.
  • To correlate in vitro telomerase activity with in vivo telomeric sequence characteristics.

Main Methods:

  • Enzymatic assays to measure telomerase activity.
  • Genetic analysis to determine gene requirements (TLC1, EST1).

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  • Biochemical characterization of enzyme processivity and product formation.

    • Main Results:

    • Telomerase activity was identified and characterized in both S. castellii and S. cerevisiae.
    • S. cerevisiae telomerase required the TLC1 gene but not EST1 for activity.
    • This activity demonstrated low processivity and a high frequency of stalling in vitro.
    • S. cerevisiae telomerase produced non-regularly repeated DNA products.

    Conclusions:

    • The in vitro properties of S. cerevisiae telomerase, including high stalling, likely account for its irregular telomeric sequences observed in vivo.
    • Distinct telomerase mechanisms may exist even within closely related yeast species.
    • Understanding telomerase function provides insights into genome maintenance and evolution.