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Preventing Multimer Formation in Commonly Used Synthetic Biology Plasmids.

Elizabeth Vaisbourd1, Anat Bren1, Uri Alon1

  • 1Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel 76100.

ACS Synthetic Biology
|March 18, 2025
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Summary
This summary is machine-generated.

Plasmid multimers, tandem repeats of plasmids, form in Escherichia coli MG1655 but not typically in JM109. A ΔrecA knockout strain prevents multimer formation, improving synthetic circuit reliability.

Keywords:
concatemerslong-read sequencingmultimersnanopore sequencingplasmidsrecombination

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Microbiology

Background:

  • Plasmids are vital tools in research and biotechnology.
  • Maintaining plasmid integrity, specifically preventing multimer formation, is crucial for optimizing synthetic circuits.
  • Plasmid multimers, arising from failed dimer resolution, can impact circuit function, particularly with DNA-editing enzymes.

Purpose of the Study:

  • To investigate the occurrence of plasmid multimers in common laboratory strains of Escherichia coli.
  • To identify factors influencing multimer formation.
  • To develop strategies for mitigating multimer production in plasmid-based systems.

Main Methods:

  • Surveyed four common plasmid backbones in cloning (JM109) and wild-type (MG1655) Escherichia coli strains.
  • Assessed multimer formation in relation to plasmid copy number and culture passaging.
  • Created and tested an MG1655 ΔrecA single-locus knockout strain for its ability to prevent multimer production.

Main Results:

  • Plasmid multimers were observed significantly only in the MG1655 strain.
  • Multimer fraction increased with higher plasmid copy number and extended culture passaging in MG1655.
  • Transformed multimers into JM109 resulted in strains lacking singlet plasmids.
  • The MG1655 ΔrecA knockout strain effectively prevented multimer formation.

Conclusions:

  • Plasmid multimerization is strain-dependent in Escherichia coli, occurring notably in wild-type MG1655.
  • Factors like plasmid copy number and passaging influence multimer accumulation.
  • Genetic modification, such as creating a ΔrecA knockout, can eliminate multimer production, enhancing plasmid-based synthetic circuit reliability.