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Related Experiment Videos

Lactococcal plasmid pWV01 as an integration vector for lactococci.

K J Leenhouts1, J Kok, G Venema

  • 1Institute of Genetics, University of Groningen, Haren, The Netherlands.

Applied and Environmental Microbiology
|September 1, 1991
PubMed
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A novel integration vector, pINT1, was developed for Lactococcus lactis, enabling stable, multi-copy gene integration into the bacterial chromosome. This system facilitates enhanced genetic engineering in lactic acid bacteria.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetic Engineering

Background:

  • The lactococcal plasmid pWVO1's replication gene (repA) was integrated into the Bacillus subtilis chromosome.
  • This engineered strain facilitated the creation of the pWVO1-based integration vector, pINT1, which lacks the repA gene.

Purpose of the Study:

  • To develop a novel integration vector for stable, multi-copy gene insertion into the Lactococcus lactis chromosome.
  • To establish a Campbell-like integration system derived entirely from lactococcal DNA.

Main Methods:

  • Construction of a Bacillus subtilis strain harboring the repA gene.
  • Development of the pINT1 integration vector lacking the repA gene.
  • Transformation of Lactococcus lactis MG1363 with pINT1 containing lactococcal chromosomal DNA fragments.

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Main Results:

  • The pINT1 plasmid did not replicate in Lactococcus lactis MG1363.
  • pINT1 integrated into the host chromosome via a Campbell-like mechanism.
  • Stable transformants with 1-4 tandem plasmid copies integrated into the chromosome were obtained.

Conclusions:

  • The pWVO1 plasmid system can be adapted for a Campbell-like integration strategy in Lactococcus lactis.
  • This system allows for the stable, chromosomal integration of multiple gene copies in lactic acid bacteria.
  • The developed system offers a valuable tool for genetic manipulation and strain improvement in Lactococcus lactis.