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Related Experiment Videos

The clamp-loading complex for processive DNA replication.

Tomoko Miyata1, Takuji Oyama, Kouta Mayanagi

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

Nature Structural & Molecular Biology
|June 23, 2004
PubMed
Summary
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This study reveals the 3D structure of the archaeal clamp-loading complex (RFC-PCNA-DNA). It shows how proliferating cell nuclear antigen (PCNA) encircles DNA with the help of replication factor C (RFC).

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • DNA replication relies on processing factors like sliding clamps and clamp loaders.
  • Proliferating cell nuclear antigen (PCNA) is a eukaryotic ring-shaped sliding clamp that encircles DNA.
  • Replication factor C (RFC) is the clamp loader that installs PCNA onto DNA in an ATP-dependent manner.

Purpose of the Study:

  • To determine the three-dimensional structure of an archaeal clamp-loading complex (RFC-PCNA-DNA).
  • To elucidate the structural mechanism of PCNA loading by RFC.

Main Methods:

  • Single-particle electron microscopy (EM) was used to determine the 3D structure.
  • In vitro reconstitution of the RFC-PCNA-DNA complex using a nonhydrolyzable ATP analog.

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Main Results:

  • The 3D structure revealed a complex composed of a closed ring (PCNA) and a horseshoe-shaped element (RFC).
  • The atomic structure of PCNA fits within the closed ring structure.
  • The complex represents a state immediately after PCNA ring closure around the DNA duplex.

Conclusions:

  • The structure provides insights into the mechanism of DNA clamp loading.
  • This study advances our understanding of the structural dynamics of DNA replication machinery.