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RuvAB acts at arrested replication forks

M Seigneur1, V Bidnenko, S D Ehrlich

  • 1Génétique Microbienne, Institute National de la Recherche Agronomique, Jouy en Josas, France.

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|November 14, 1998
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Summary
This summary is machine-generated.

DNA double-stranded breaks (DSBs) form at arrested replication forks. The RuvABC proteins cause DSBs, but RecBCD can prevent them by resolving Holliday junctions before cleavage.

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Area of Science:

  • Molecular Biology
  • Genetics
  • DNA Repair

Background:

  • Replication arrest is a critical event that can lead to DNA double-stranded breaks (DSBs).
  • Understanding the mechanisms of DSB formation is crucial for comprehending genome stability.
  • The RecBCD complex and RuvABC proteins play significant roles in DNA metabolism.

Purpose of the Study:

  • To investigate the mechanism of DNA double-stranded break (DSB) formation at replication forks.
  • To elucidate the roles of RecBCD and RuvABC proteins in DSB generation and prevention.

Main Methods:

  • Direct measurement of in vivo linear DNA in Escherichia coli.
  • Genetic analysis of recombination-deficient mutants.

Main Results:

  • The RuvABC protein complex is responsible for inducing DSBs at arrested replication forks.
  • In cells with functional RecBCD, DSBs can be prevented, suggesting a protective role.
  • RecBCD may act on the double-stranded DNA tail before RuvC cleavage to rescue stalled forks.

Conclusions:

  • RuvABC-mediated cleavage of Holliday junctions at arrested forks is a primary cause of DSBs.
  • RecBCD can prevent DSBs by resolving these junctions, thereby maintaining genome integrity.