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Recognition of telomeric DNA

P König1, D Rhodes

  • 1Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.

Trends in Biochemical Sciences
|February 1, 1997
PubMed
Summary

The yeast telomere-binding protein RAP1

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Telomeres are protective caps at the ends of chromosomes.
  • Telomere-binding proteins are crucial for maintaining telomere stability.
  • Understanding telomere recognition mechanisms is vital for cellular processes.

Purpose of the Study:

  • To elucidate the three-dimensional structure of yeast telomere-binding protein RAP1.
  • To gain insights into the mechanism of telomeric DNA recognition by RAP1.
  • To explore potential conserved protein folds involved in telomeric DNA binding.

Main Methods:

  • X-ray crystallography to determine the 3D structure of RAP1-DNA complex.
  • Structural analysis of DNA-binding motifs within RAP1.
  • Comparative analysis with other known telomere-binding factors.

Main Results:

  • The study reveals the first 3D structure of yeast RAP1 in complex with DNA.
  • RAP1 utilizes two Myb/homeodomain-like motifs for DNA binding.
  • These motifs are known DNA-binding folds found in transcription factors.

Conclusions:

  • A conserved protein fold, specifically Myb-like motifs, may be a common mechanism for telomeric DNA recognition.
  • This finding suggests a potential evolutionary link in telomere-binding proteins across species.
  • The structural insights into RAP1-DNA interaction advance our understanding of telomere maintenance.

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