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Related Experiment Videos

Identification of plasmid partition function in coryneform bacteria.

Y Kurusu1, Y Satoh, M Inui

  • 1Tsukuba Research Center, Mitsubishi Petrochemical Co., Ltd., Ibaraki, Japan.

Applied and Environmental Microbiology
|March 1, 1991
PubMed
Summary

Researchers identified a novel plasmid partition function essential for stable maintenance in coryneform bacteria. This DNA fragment stabilizes plasmids in cis, crucial for genetic stability in Brevibacterium and Corynebacterium species.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Plasmids are essential extrachromosomal DNA elements in bacteria.
  • Stable maintenance of plasmids is critical for bacterial genetic stability and biotechnological applications.
  • Coryneform bacteria, including Brevibacterium and Corynebacterium species, are important industrial microorganisms.

Purpose of the Study:

  • To identify and characterize a novel partition function responsible for stable plasmid maintenance.
  • To determine the genetic location and functional properties of this stabilization mechanism.
  • To investigate the mechanism of action, including its independence from replication and copy number control.

Main Methods:

  • Plasmid construction and transformation in Brevibacterium flavum and Corynebacterium glutamicum.

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  • DNA fragment analysis using restriction enzyme digestion (HindIII-NspV).
  • Functional assays to assess plasmid stability and localization (cis vs. trans).

    • Main Results:

    • A specific 673 bp DNA fragment (HindIII-NspV) from plasmid pBY503 was identified as a partition function.
    • This function is essential for stable plasmid maintenance in Brevibacterium flavum MJ233 and Corynebacterium glutamicum ATCC 31831.
    • The identified function operates in cis, stabilizing plasmids independently of replication and copy number control.

    Conclusions:

    • A novel plasmid partition function has been characterized in coryneform bacteria.
    • This function is crucial for ensuring plasmid stability, independent of replication machinery.
    • The findings provide insights into bacterial plasmid biology and potential tools for genetic engineering.