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Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System
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Differences between bacteria and eukaryotes in clamp loader mechanism, a conserved process underlying DNA

Jacob T Landeck1, Joshua Pajak1, Emily K Norman1

  • 1Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA.

The Journal of Biological Chemistry
|March 15, 2024
PubMed
Summary

Bacterial clamp loaders open DNA sliding clamps via a unique crab-claw motion at a single pivot point, differing from eukaryotic mechanisms. This research reveals multi-step clamp opening and closing dynamics crucial for DNA replication and genome integrity.

Keywords:
AAA + ATPaseDNA replicationbacteriaclamp loadercryo-EM

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Clamp loaders are essential pentameric ATPases that load ring-shaped sliding clamps onto DNA.
  • This process is critical for DNA replication and maintaining genome integrity across all domains of life.
  • Eukaryotic clamp loaders (Replication Factor C) utilize a crab-claw mechanism involving significant conformational changes.

Purpose of the Study:

  • To elucidate the high-resolution mechanism of the clamp loading process in Escherichia coli.
  • To compare the clamp opening and loading mechanism of bacterial clamp loaders with their eukaryotic counterparts.
  • To understand the structural dynamics of clamp opening, closing, and release from primer-template junctions.

Main Methods:

  • High-resolution cryo-electron microscopy (cryo-EM) of the E. coli clamp loader.
  • Structural analysis of the clamp loader in various states, including with primer-template junctions.
  • Comparative structural analysis with eukaryotic Replication Factor C.

Main Results:

  • The E. coli clamp loader employs a crab-claw motion at a single pivot point for clamp opening, distinct from the distributed motions in eukaryotic RFC.
  • Clamp opening proceeds through multiple steps, involving an intermediate spiral conformation and a final planar, wide-open clamp state.
  • Structures captured the clamp closing around primer-template junctions and the loader initiating release.

Conclusions:

  • Mechanistic distinctions exist in the conserved clamp loading machinery between bacteria and eukaryotes.
  • The study reveals novel insights into the multi-step dynamics of clamp opening and closing.
  • These findings advance our understanding of DNA replication and genome maintenance mechanisms.