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Related Experiment Videos

A xylose-inducible expression system for Lactococcus lactis.

Anderson Miyoshi1, Emmanuel Jamet, Jacqueline Commissaire

  • 1Laboratório de Genética Celular e Molecular, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil.

FEMS Microbiology Letters
|October 13, 2004
PubMed
Summary

A novel Lactococcus lactis expression system allows controlled production of heterologous proteins. This xylose-inducible system efficiently targets proteins to the cytoplasm or extracellular medium.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Lactococcus lactis is a key lactic acid bacterium used in food fermentation.
  • Efficient heterologous protein production in L. lactis is crucial for various biotechnological applications.
  • Existing expression systems may lack precise control over protein targeting and induction.

Purpose of the Study:

  • To develop and characterize a novel, controlled gene expression system in Lactococcus lactis.
  • To enable targeted production of heterologous proteins in either the cytoplasm or the extracellular medium.
  • To assess the versatility and efficiency of the developed system for protein production.

Main Methods:

  • Construction of a gene expression system in L. lactis NCDO2118 utilizing the xylose-inducible P(xylT) promoter.

Related Experiment Videos

  • Fusion of the Staphylococcus aureus nuclease gene (nuc) with or without the Usp45 signal peptide for cytoplasmic or secreted protein production, respectively.
  • Analysis of protein expression levels, targeting, and inducibility using xylose and glucose.

    • Main Results:

    • The P(xylT) promoter demonstrated tight, xylose-inducible control over gene expression.
    • High-level and sustained production of the nuclease protein was achieved.
    • Correct targeting of the protein to either the cytoplasm or the extracellular medium was confirmed.
    • The system exhibited versatility, allowing easy switching of protein production on (xylose) or off (glucose).

    Conclusions:

    • The developed xylose-inducible expression system provides a versatile and efficient tool for heterologous protein production in Lactococcus lactis.
    • This system allows precise control over protein localization (cytoplasmic or secreted) and expression levels.
    • It offers a valuable alternative for biotechnological applications requiring controlled protein synthesis in L. lactis.