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Related Concept Videos

Conserved Binding Sites01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Fluorescence-Based Detection of FEN1 Nuclease Activity and Screening of Small-Molecule Inhibitors
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Mapping the FEN1 interaction domain with hTERT.

Shilpa Sampathi1, Weihang Chai

  • 1WWAMI Medical Education Program, Washington State University, Spokane, WA 99210, USA.

Biochemical and Biophysical Research Communications
|February 25, 2011
PubMed
Summary
This summary is machine-generated.

Flap endonuclease 1 (FEN1) interacts with telomerase throughout the S phase in mammalian cells. This interaction is mediated by FEN1’s C-terminus and nuclease domain, offering insights into telomere maintenance.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Telomerase activity is crucial for cancer cell proliferation and is regulated by various proteins, including DNA replication factors.
  • The precise mechanisms by which replication proteins influence telomerase in higher eukaryotes remain largely unknown.
  • Flap endonuclease 1 (FEN1), a multifunctional DNA replication and repair protein, has been previously shown to complex with telomerase.

Purpose of the Study:

  • To further investigate the nature of the association between FEN1 and telomerase in mammalian cells.
  • To determine the timing of FEN1-telomerase complex formation during the cell cycle.
  • To identify the specific domains of FEN1 involved in its interaction with telomerase.

Main Methods:

  • Co-immunoprecipitation assays to confirm and analyze the FEN1-telomerase complex.
  • Cell cycle analysis to determine the temporal association of FEN1 and telomerase.
  • Site-directed mutagenesis and deletion analysis to map the FEN1 domains responsible for telomerase interaction.

Main Results:

  • FEN1 and telomerase associate throughout the S phase, peaking in mid-S phase.
  • The C-terminus and the nuclease domain of FEN1 are essential for its interaction with telomerase.
  • The ability of FEN1 to bind PCNA is not required for its association with telomerase.

Conclusions:

  • The interaction between FEN1 and telomerase is a dynamic process occurring during DNA replication.
  • Specific domains within FEN1 mediate its interaction with telomerase, independent of PCNA binding.
  • These findings elucidate novel protein-protein interactions involved in maintaining functional telomeres by telomerase.