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Related Experiment Videos

Replication factor C recognizes 5'-phosphate ends of telomeres

F Uchiumi1, T Ohta, S Tanuma

  • 1Department of Biochemistry, Faculty of Pharmaceutical Sciences, Science University of Tokyo, Japan.

Biochemical and Biophysical Research Communications
|December 4, 1996
PubMed
Summary

Replication Factor C (RFC) binds specifically to telomere ends, recognizing 5'-phosphoryl groups. This discovery suggests a new role for RFC in maintaining telomere stability and DNA replication.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Telomere structure is crucial for chromosome integrity, cell senescence, and immortality.
  • Understanding proteins that interact with telomeres is key to comprehending these processes.

Purpose of the Study:

  • To identify proteins that specifically bind to telomere repeat sequences.
  • To investigate the role of Replication Factor C (RFC) in telomere binding and function.

Main Methods:

  • Screening a Jurkat cDNA library using labeled telomere probes.
  • Utilizing electrophoretic mobility shift assays with RFC-glutathione S-transferase (GST) fusion protein.
  • Analyzing structure-specific binding to different telomere end configurations.

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Main Results:

  • A clone encoding a region of the large subunit of Replication Factor C (RFC) was identified.
  • RFC preferentially binds to 5"-phosphoryl groups at the ends of double-stranded telomere repeats.
  • RFC demonstrated structure-specific binding, distinguishing between different end-group configurations.

Conclusions:

  • Replication Factor C (RFC) exhibits novel, structure-specific DNA binding at telomere ends.
  • These findings suggest a previously unrecognized function for RFC in telomere stability and/or turnover.
  • RFC's interaction with telomeres may impact cell senescence and immortality.