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A chimeric vector for efficient chromosomal modification in Enterococcus faecalis and other lactic acid bacteria.

V S Blancato1, C Magni

  • 1Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET) and Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario, Argentina.

Letters in Applied Microbiology
|February 18, 2010
PubMed
Summary

A new plasmid, pBVGh, enables rapid gene modification in Enterococcus faecalis. This tool simplifies mutant generation and screening, aiding in the development of food-grade strains.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Enterococcus faecalis is a significant bacterium in food and clinical settings.
  • Efficient methods for genetic manipulation are crucial for studying and engineering E. faecalis.

Purpose of the Study:

  • To develop a novel chimeric vector, pBVGh, for streamlined gene modification in Enterococcus faecalis.
  • To facilitate rapid generation and selection of enterococcal mutant strains.

Main Methods:

  • Construction of the pBVGh plasmid.
  • Utilizing a thermosensitive (TS) pG(+)host replicon for temperature-inducible mutant generation.
  • Employing blue-white screening for efficient mutant selection.

Main Results:

  • The pBVGh vector successfully enables straightforward gene inactivation and modification.
  • Temperature shifts allow for simple mutant generation.
  • Blue-white screening provides rapid identification of plasmid-free bacteria.

Conclusions:

  • The pBVGh vector offers a robust and efficient system for generating and selecting enterococcal mutants.
  • The broad applicability of the TS replicon facilitates the creation of food-grade mutant strains in E. faecalis and other Gram-positive bacteria.