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Escherichia coli K-12 has two distinguishable PriA-PriB replication restart pathways.

Steven J Sandler1, Maxime Leroux1,2, Tricia A Windgassen3,4

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Molecular Microbiology
|August 23, 2021
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Summary

The study reveals two distinct PriA-PriB replication restart pathways in E. coli. One pathway relies on PriA

Keywords:
DNA repairDNA replicationSOS responsehomologous recombinationreplication restart

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA replication restart is essential for cell viability.
  • In Escherichia coli, the PriA protein is central to multiple replication restart pathways.
  • Understanding PriA's functions is key to comprehending DNA repair mechanisms.

Purpose of the Study:

  • To investigate the distinct roles of PriA protein variants in DNA replication restart pathways.
  • To biochemically characterize the ATPase and helicase activities of PriA mutants.
  • To elucidate the genetic and biochemical basis of two separate PriA-PriB pathways.

Main Methods:

  • Site-directed mutagenesis of the priA gene in Escherichia coli.
  • Biochemical assays including ATPase and helicase activity measurements.
  • In vivo phenotypic analysis of priA mutant strains.
  • In vitro interaction studies with PriB and DNA.

Main Results:

  • PriA300 mutant lacks ATPase and helicase activity but retains PriB interaction.
  • PriA301 mutant shows reduced DNA and PriB interactions but retains helicase activity.
  • A double mutant (PriA300,301) retains only DNA interaction ability.
  • Mutant phenotypes suggest two distinct PriA-PriB pathways: one helicase-dependent, one helicase-independent.

Conclusions:

  • The PriA protein utilizes distinct mechanisms in different replication restart pathways.
  • Two biochemically and genetically separable PriA-PriB pathways exist.
  • One pathway depends on PriA's helicase activity, while the other involves helicase-independent remodeling.