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Related Experiment Videos

Cellular responses to postsegregational killing by restriction-modification genes.

N Handa1, A Ichige, K Kusano

  • 1Department of Molecular Biology, Institute of Medical Science, University of Tokyo, Shirokanedai, Tokyo 108-8639, Japan.

Journal of Bacteriology
|March 29, 2000
PubMed
Summary
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Plasmids with restriction modification genes enhance stability by preventing cell death upon loss. Bacterial DNA repair systems like RecBCD/RecA help cells survive chromosome cleavage after losing these genes.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Plasmids carrying type II restriction modification (R-M) gene complexes enhance plasmid stability.
  • This stability is attributed to post-segregational cell killing, where loss of the R-M complex leads to restriction enzyme-mediated cleavage of chromosomal DNA.
  • The precise bacterial responses and the role of DNA repair mechanisms in this process require further investigation.

Purpose of the Study:

  • To investigate bacterial cellular responses to post-segregational cell killing following the loss of a restriction modification gene complex.
  • To elucidate the role of DNA repair pathways, particularly the RecBCD/RecA system, in bacterial survival after R-M gene complex loss.

Main Methods:

  • Utilized a temperature-sensitive plasmid carrying the EcoRI restriction modification gene complex in an Escherichia coli strain.

Related Experiment Videos

  • Analyzed cellular processes, including cell viability, filamentation, and DNA repair induction (SOS response), after shifting to a non-permissive temperature.
  • Examined responses in various DNA repair mutants (recBCD, recA, ruvAB, ruvC, recG, recN).

    • Main Results:

    • Loss of the EcoRI R-M gene complex led to decreased cell viability, filamentation, and induction of the SOS response.
    • These effects were exacerbated in recBCD mutants, with increased chromosome cleavage.
    • Growth inhibition was more severe in multiple DNA repair mutants, indicating a protective role for these systems.
    • The SOS response was dependent on the RecBC enzyme.

    Conclusions:

    • Bacterial cell death upon R-M gene complex loss results from chromosome cleavage.
    • The bacterial RecBCD/RecA DNA repair machinery plays a crucial role in mitigating cell death by repairing cleaved chromosomes.
    • Hypothesized that the RecBCD/Chi/RecA system distinguishes and processes "nonself" DNA (restriction) and "self" DNA (repair).