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Visualization of UV-induced Replication Intermediates in E. coli using Two-dimensional Agarose-gel Analysis
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Lambda red mediated gap repair utilizes a novel replicative intermediate in Escherichia coli.

Thimma R Reddy1, Léna M S Fevat2, Sarah E Munson3

  • 1Department of Biochemistry, University of Leicester, Leicester, United Kingdom.

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|March 25, 2015
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Summary

The lambda phage Red recombination system

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Genetics

Background:

  • The lambda phage Red recombination system facilitates homologous recombination in Escherichia coli, underpinning recombineering techniques.
  • Previous models suggested Red-mediated gap repair in plasmids relies on lagging strand synthesis and Okazaki fragment ligation.
  • This study investigates the mechanism of Red-mediated gap repair, challenging existing models.

Purpose of the Study:

  • To elucidate the mechanism of Red-mediated homologous recombination in DNA gap repair in Escherichia coli.
  • To determine if gap repair exhibits strand bias, specifically a lagging strand preference.
  • To develop novel recombineering applications based on observed recombination mechanisms.

Main Methods:

  • Performed gap repair assays on double-stranded DNA (dsDNA) and single-stranded DNA (ssDNA) plasmids to assess strand asymmetry.
  • Investigated insertional recombination combined with gap repair to evaluate recombination routes.
  • Utilized mutations in DNA polymerase I to assess its role in the gap repair process.
  • Developed and applied a new recombineering method, SPI (subcloning plus insertion).

Main Results:

  • Gap repair assays revealed a strand-independent mechanism, lacking the previously postulated lagging strand bias.
  • Lagging strand recombination was observed in ssDNA plasmids but not in dsDNA plasmids during gap repair.
  • The predominant recombination pathway involved concerted insertion and subcloning, modifying both DNA strands.
  • The new SPI method enabled simultaneous insertion of up to four gene cassettes, efficiently selecting for desired recombinants.

Conclusions:

  • Red-mediated gap repair in dsDNA plasmids operates via a strand-independent mechanism, distinct from lagging strand models.
  • A novel replicative intermediate, not involving a replication fork, likely mediates gap repair.
  • The SPI technique offers an efficient and versatile tool for complex DNA engineering in Escherichia coli.
  • Findings advance the understanding of DNA replication and recombination mechanisms in E. coli.