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Related Experiment Videos

Mutational analysis of Pyrococcus furiosus replication factor C based on the three-dimensional structure.

Sonoko Ishino1, Takuji Oyama, Mihoko Yuasa

  • 1Department of Molecular Biology, Biomolecular Engineering Research Institute, 6-2-3 Furuedai, 565-0874 Suita, Osaka, Japan.

Extremophiles : Life Under Extreme Conditions
|May 28, 2003
PubMed
Summary

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Replication Factor C (RFC) loads the PCNA clamp for DNA replication. Structural and biochemical studies of Pyrococcus furiosus RFC

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Replication Factor C (RFC) is a crucial clamp loader in DNA replication, essential for loading the sliding clamp protein PCNA onto DNA.
  • Homologous RFC proteins are found in Archaea, suggesting conserved functions in DNA replication machinery.

Purpose of the Study:

  • To determine the crystal structure of the small subunit (RFCS) of Pyrococcus furiosus RFC.
  • To investigate the structure-function relationship of RFCS in the clamp-loading process through mutagenesis and biochemical characterization.

Main Methods:

  • X-ray crystallography to determine the 3D structure of RFCS.
  • Site-directed mutagenesis to create modified RFCS subunits.
  • Biochemical assays to assess RFC's clamp-loading activity and interactions.

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Main Results:

  • The crystal structure of Pyrococcus furiosus RFCS was determined at 2.8-Å resolution.
  • Truncation of the C-terminal alpha-helix (α16) disrupted RFCS oligomerization and abolished its ability to stimulate PCNA-dependent DNA synthesis.
  • Mutations reducing negative charges in the central region of RFCS destabilized the RFC-PCNA interaction and impaired clamp-loading activity.

Conclusions:

  • The C-terminal alpha-helix of RFCS is critical for its oligomerization and function in clamp loading.
  • Specific charged residues in the central RFCS region are important for stable RFC-PCNA interaction and efficient clamp-loading.
  • These findings elucidate the structure-function relationship of RFC in the DNA clamp-loading mechanism.