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A novel, broad-range, CTXΦ-derived stable integrative expression vector for functional studies.

Bhabatosh Das1, Reena Kumari2, Archana Pant2

  • 1Centre for Human Microbial Ecology, Translational Health Science and Technology Institute, Gurgaon, Haryana, India bhabatosh@thsti.res.in.

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|September 17, 2014
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Summary
This summary is machine-generated.

Researchers engineered a novel integrative expression vector, pBD62, utilizing CTXΦ phage technology for broad-host-range bacterial integration. This vector enables controlled gene expression via the XerCD recombinase system, offering a versatile tool for molecular biology applications.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • CTXΦ phage integrates into Vibrio cholerae via XerCD recombinases at the dif site.
  • This integration mechanism relies on conserved XerC and XerD binding sites (XBS) within the phage genome.
  • The XerCD recombinase system and dif site are conserved across many bacterial species.

Purpose of the Study:

  • To develop a broad-host-range integrative expression vector.
  • To leverage the CTXΦ phage integration strategy for stable, site-specific chromosomal integration.
  • To create a tool for controlled gene expression in diverse bacterial hosts.

Main Methods:

  • Engineered arabinose-inducible expression vectors (pBD62, pBD66) using CTXΦ XBS.
  • Utilized host-encoded XerCD recombinases for site-specific integration into the bacterial dif site.
  • Validated integration and gene expression in various bacterial species (V. cholerae, E. coli, Salmonella, Klebsiella).

Main Results:

  • pBD62 demonstrated efficient and irreversible integration into the dif site of multiple bacterial species.
  • Gene expression from the integrated pBD62 vector was successfully controlled by the arabinose-inducible PBAD promoter.
  • Reporter gene expression (mCherry, eGFP, lacZ) confirmed the functionality of the integrated vectors in V. cholerae.

Conclusions:

  • The developed vector system provides a robust method for stable, site-specific gene integration and expression in a broad range of bacteria.
  • This technology offers a valuable tool for genetic engineering and functional studies in diverse bacterial pathogens and commensals.
  • The CTXΦ phage integration strategy is a powerful platform for developing novel genetic tools for bacterial research.