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Related Experiment Videos

Helicase-defective RuvB(D113E) promotes RuvAB-mediated branch migration in vitro.

H George1, C Mézard, A Stasiak

  • 1Clare Hall Laboratories, Imperial Cancer Research Fund, South Mimms, Herts, EN6 3LD, UK.

Journal of Molecular Biology
|November 2, 1999
PubMed
Summary

The RuvAB complex in Escherichia coli facilitates DNA branch migration at Holliday junctions. A mutant RuvB protein (RuvB(D113E)) shows impaired helicase activity but still promotes branch migration, suggesting limited DNA unwinding is essential.

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Area of Science:

  • Molecular Biology
  • DNA Repair Mechanisms
  • Bacterial Genetics

Background:

  • The RuvA and RuvB proteins in Escherichia coli are crucial for resolving Holliday junctions during DNA repair.
  • RuvA binds specifically to the junction, while RuvB drives ATP-dependent branch migration.
  • RuvB possesses DNA helicase motifs, and the RuvAB complex exhibits helicase activity in vitro.

Purpose of the Study:

  • To investigate the role of DNA unwinding in RuvAB-mediated branch migration.
  • To characterize a mutant RuvB protein (RuvB(D113E)) with altered helicase activity.

Main Methods:

  • Purification of the mutant RuvB(D113E) protein.
  • Analysis of RuvB(D113E) protein's ability to form hexameric rings on DNA.
  • Assay of RuvB(D113E)'s ATPase and DNA helicase activities.

Related Experiment Videos

  • Assessment of RuvAB complex activity with the mutant RuvB protein in promoting branch migration.

    • Main Results:

    • The purified RuvB(D113E) mutant protein successfully formed hexameric rings on DNA, similar to the wild-type.
    • The RuvB(D113E) mutant protein, in conjunction with RuvA, promoted branch migration.
    • RuvB(D113E) exhibited significantly reduced ATPase activity and compromised DNA helicase activity compared to wild-type RuvB.

    Conclusions:

    • The RuvAB complex can mediate branch migration with a RuvB mutant protein that has severely impaired helicase activity.
    • These findings suggest that extensive DNA unwinding may not be strictly required for RuvAB-mediated branch migration.
    • Models proposing branch migration with limited DNA unwinding activity are supported by these results.