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Related Experiment Videos

DNA polymerase clamp loaders and DNA recognition.

Gregory D Bowman1, Eric R Goedken, Steven L Kazmirski

  • 1Departments of Molecular and Cell Biology and Chemistry, Howard Hughes Medical Institute, University of California, Berkeley, CA 94720, USA.

FEBS Letters
|February 1, 2005
PubMed
Summary

Clamp loaders are crucial for DNA replication, forming ATPase assemblies that load sliding clamps onto DNA. Crystal structures reveal how these loaders target primer-template junctions for replication.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Clamp loaders are essential heteropentameric ATPase assemblies.
  • They are critical for processive DNA replication.
  • Clamp loaders function by loading sliding clamps onto DNA.

Purpose of the Study:

  • To review crystal structures of clamp loader complexes.
  • To provide insights into the mechanism of clamp loading.

Main Methods:

  • Review of existing crystal structure data.
  • Analysis of structural information related to clamp loader complexes.

Main Results:

  • Clamp loaders target double-stranded/single-stranded DNA junctions.

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  • Specifically, primer-template junctions with recessed 3' ends are the DNA targets.
  • Crystal structures offer detailed views of clamp loader-DNA interactions.

    • Conclusions:

    • Structural insights illuminate the clamp loading mechanism.
    • Understanding clamp loader function is key to understanding DNA replication fidelity.