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Related Experiment Videos

Open clamp structure in the clamp-loading complex visualized by electron microscopic image analysis.

Tomoko Miyata1, Hirofumi Suzuki, Takuji Oyama

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

Proceedings of the National Academy of Sciences of the United States of America
|September 20, 2005
PubMed
Summary
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This study reveals the structure of a key DNA replication complex, showing how the clamp loader ATPase (RFC) holds the sliding clamp (PCNA) open to load it onto DNA.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • DNA replication requires sliding clamps and clamp loader ATPases for processivity.
  • Replication Factor C (RFC) and Proliferating Cell Nuclear Antigen (PCNA) are essential in eukaryotes and archaea.
  • RFC acts as the clamp loader, and PCNA functions as the sliding clamp.

Purpose of the Study:

  • To determine the high-resolution structure of an archaeal RFC-PCNA-DNA complex.
  • To visualize the intermediate state of clamp loading during DNA replication.

Main Methods:

  • Electron microscopy was used to capture the complex structure.
  • Atomic structures of RFC, PCNA, and primed DNA were fitted into the electron microscopy map.
  • The resolution achieved was 12-A.

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Main Results:

  • The structure of the archaeal RFC-PCNA-DNA complex was determined at 12-A resolution.
  • The Proliferating Cell Nuclear Antigen (PCNA) ring was observed in an open conformation.
  • Extensive interactions between RFC and PCNA were identified, stabilizing the open state.

Conclusions:

  • The observed structure represents a key intermediate in the clamp loading process.
  • RFC maintains PCNA in an open conformation prior to ATP hydrolysis.
  • This structural insight clarifies the mechanism of clamp loading in DNA replication.