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Improved cloning vectors for Bifidobacterium spp

M Rossi1, P Brigidi, D Matteuzzi

  • 1Department of Pharmaceutical Sciences, University of Bologna, Italy.

Letters in Applied Microbiology
|May 7, 1998
PubMed
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See all related articles

Researchers developed new shuttle vectors for Bifidobacterium transformation, enabling efficient gene cloning and expression. These novel plasmids offer improved stability and selection markers for genetic engineering in various Bifidobacterium species.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Bifidobacterium species are crucial probiotics with significant industrial and therapeutic applications.
  • Efficient genetic manipulation tools are essential for enhancing Bifidobacterium functionalities.
  • Existing vectors often lack stability or broad host range for diverse Bifidobacterium species.

Purpose of the Study:

  • To construct and characterize novel recombinant plasmids for gene expression in Bifidobacterium.
  • To develop a versatile set of Escherichia coli-Bifidobacterium shuttle vectors.
  • To assess the transformation efficiency and stability of the new vectors in multiple Bifidobacterium species.

Main Methods:

  • Construction of recombinant plasmids (pDLI41, pDGA7, pDCO7) by cloning heterologous genes into a Bifidobacterium longum-based vector (pDG7).

Related Experiment Videos

  • Development of a novel set of shuttle vectors (pLF5, pCLJ15, pSPEC1) with antibiotic resistance markers.
  • Transformation of five different Bifidobacterium species with the constructed plasmids.
  • Characterization of the smallest vector (pTRE3) for size, multicloning site, and stability.

    • Main Results:

    • Successfully constructed hybrid plasmids expressing Pseudomonas fluorescens lipase, Bacillus licheniformis alpha-amylase, and Streptomyces sp. cholesterol oxidase.
    • Achieved efficient transformation of Bifidobacterium across five species using the hybrid plasmids.
    • Developed a new series of E. coli-Bifidobacterium shuttle vectors with chloramphenicol, erythromycin, and spectinomycin resistance markers.
    • Identified pTRE3 as the smallest (2.8 kb) Bifidobacterium vector with a multicloning site and high stability.

    Conclusions:

    • The developed shuttle vectors provide robust tools for genetic engineering of Bifidobacterium.
    • These vectors facilitate the expression of heterologous genes, expanding their biotechnological potential.
    • The novel vectors demonstrate high efficiency, stability, and versatility for applications in microbial biotechnology.