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Antibiotic Selection00:57

Antibiotic Selection

Overview

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Stable expression plasmids for Streptomyces based on a toxin-antitoxin system.

Laura Sevillano1, Margarita Díaz, Ramón I Santamaría

  • 1Instituto de Biología Funcional y Genómica, Consejo Superior de Investigaciones Científicas/Universidad de Salamanca, Salamanca 37007, Spain.

Microbial Cell Factories
|April 27, 2013
PubMed
Summary

This study introduces a novel method for stable plasmid expression in Streptomyces using a toxin-antitoxin system, eliminating the need for antibiotic selection in protein production. This approach enhances the industrial and pharmaceutical applications of Streptomyces for protein manufacturing.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Streptomyces species are valuable hosts for heterologous protein expression due to their high secretion capacity.
  • Current expression vectors rely on antibiotic resistance genes, posing challenges for industrial protein production.
  • Antibiotic use in industrial protein manufacturing is increasingly restricted due to contamination risks.

Purpose of the Study:

  • To develop a stable plasmid expression system in Streptomyces utilizing the yefM/yoeBsl toxin-antitoxin system.
  • To eliminate the requirement for antibiotic selection markers in Streptomyces protein production.

Main Methods:

  • Constructed a Streptomyces lividans mutant strain with the yoeBsl toxin gene in the genome and the yefMsl antitoxin gene on a temperature-sensitive plasmid.
  • Transformed the host strain with an expression plasmid containing the antitoxin gene and the gene of interest.
  • Eliminated the temperature-sensitive plasmid to select for cells maintaining the expression plasmid.

Main Results:

  • Successfully overproduced two proteins, an α-amylase and a xylanase, without antibiotic addition.
  • Demonstrated high protein yields even after extended incubation periods (8 days) and serial subcultures.
  • Confirmed the stability of expression plasmids in Streptomyces without antibiotic selection.

Conclusions:

  • This is the first report of using a toxin-antitoxin system for stable maintenance of high-copy plasmids in Streptomyces.
  • This novel system offers a valuable tool for industrial and pharmaceutical protein production using Streptomyces.
  • The developed method enables antibiotic-free protein production, mitigating contamination risks.