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Related Experiment Videos

PriA helicase and SSB interact physically and functionally.

Chris J Cadman1, Peter McGlynn

  • 1School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK.

Nucleic Acids Research
|December 4, 2004
PubMed
Summary
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The single-strand DNA binding protein (SSB) specifically stimulates PriA helicase activity in DNA replication restart. This interaction, mediated by SSB's C-terminus, ensures efficient reloading of the DnaB helicase onto DNA.

Area of Science:

  • Molecular Biology
  • DNA Replication
  • Protein-Protein Interactions

Background:

  • PriA helicase is crucial for initiating DNA replication restart in Escherichia coli.
  • PriA reloads the DnaB helicase onto repaired replication forks and D-loops.
  • The role of accessory proteins in modulating PriA activity is not fully understood.

Purpose of the Study:

  • To investigate the effect of single-strand DNA binding protein (SSB) on PriA helicase activity.
  • To elucidate the mechanism of SSB-PriA interaction and its functional consequences.
  • To determine the role of SSB in facilitating PriA-directed replication restart.

Main Methods:

  • In vitro assays measuring PriA-catalyzed DNA unwinding.
  • Analysis of PriA activity in the presence of wild-type and mutant SSB proteins.

Related Experiment Videos

  • Biochemical characterization of the interaction between PriA and SSB.

    • Main Results:

    • SSB specifically stimulates PriA-catalyzed unwinding of branched DNA substrates.
    • This stimulation requires SSB binding to the DNA and involves a physical interaction with the SSB C-terminus.
    • Mutations in the SSB C-terminus impair the SSB-PriA interaction and lead to DNA repair/recombination defects.

    Conclusions:

    • SSB plays a critical role in facilitating PriA-directed DNA replication restart.
    • The interaction between SSB and PriA ensures efficient DnaB helicase reloading onto the lagging strand template.
    • Protein-protein interactions involving SSB are key to coordinating replication fork reloading.