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The Telomeric Cdc13 Protein from Yeast Hansenula polymorpha.

A N Malyavko1, O A Dontsova1,2,3

  • 1Faculty of Chemistry and Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991 Russia.

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Researchers identified the Cdc13 protein in Hansenula polymorpha yeast, finding it binds telomeric DNA and interacts with Stn1 and TERT. This suggests Cdc13

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Area of Science:

  • * Molecular and Cellular Biology
  • * Yeast Genetics
  • * Telomere Biology

Background:

  • * Telomeres protect chromosome ends and exhibit species-specific composition.
  • * Understanding telomere protein function is crucial for genetic stability.
  • * Hansenula polymorpha is a thermotolerant yeast model system.

Purpose of the Study:

  • * To identify and characterize the Cdc13 homolog in Hansenula polymorpha.
  • * To investigate the DNA-binding and protein-interaction capabilities of H. polymorpha Cdc13.
  • * To explore the role of Cdc13 in telomere maintenance and telomerase recruitment in this yeast species.

Main Methods:

  • * Gene identification and cloning of the Cdc13 homolog.
  • * Biochemical assays to assess single-stranded telomeric DNA binding.
  • * Protein-protein interaction studies (e.g., yeast two-hybrid or co-immunoprecipitation).

Main Results:

  • * The Cdc13 homolog in H. polymorpha was successfully identified.
  • * H. polymorpha Cdc13 specifically binds to single-stranded telomeric DNA.
  • * Cdc13 interacts with both Stn1 and TERT (telomerase reverse transcriptase).

Conclusions:

  • * H. polymorpha Cdc13 functions as a telomeric DNA-binding protein.
  • * The interaction with Stn1 suggests a conserved role in the CST complex.
  • * Evidence indicates Cdc13's involvement in recruiting telomerase to telomeres in H. polymorpha.