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A Simple and Effective Strategy for the Development of Robust Promoter-Centric Gene Expression Tools.

Tongjian Yang1,2,3, Yihua Chen1,2, Xiaozhou Luo3

  • 1State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China.

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|August 9, 2024
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Summary

Researchers developed new genetic tools for controlling gene expression in Streptomyces. The engineered oxytetracycline-inducible system (OK) shows significantly enhanced activity, advancing synthetic biology and strain engineering.

Keywords:
Streptomycesbiosynthetic gene clusterconstitutive promoterenzyme expressioninducible expression systempalindromic cis-element

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Promoter-centric genetic tools are essential for gene expression control in strain engineering and synthetic biology.
  • Streptomyces are valuable hosts for producing natural products and high-value compounds.
  • There is a continuous need for improved and robust gene expression tools.

Purpose of the Study:

  • To develop a straightforward and effective strategy for creating potent gene expression tools for Streptomyces.
  • To engineer novel constitutive and inducible gene expression systems.
  • To demonstrate the enhanced activity and applicability of these tools.

Main Methods:

  • Engineered promoters by adding a -35-like motif upstream of the native -35 region.
  • Integrated a palindromic cis-element into the 5'-UTR region of promoters.
  • Tested engineered promoters (OK, PL, P21) for gene expression strength and inducibility.
  • Validated tool effectiveness by measuring transglutaminase and daptomycin production.

Main Results:

  • Generated a collection of robust constitutive and inducible gene expression tools for Streptomyces.
  • The oxytetracycline-inducible system (OK) demonstrated nearly a tenfold increase in activity compared to kasO p*.
  • Enhanced activity was also observed in other tested promoters (PL, P21).
  • Augmented production of transglutaminase and daptomycin was achieved using the developed tools.

Conclusions:

  • The developed strategy effectively creates potent gene expression tools for Streptomyces.
  • The OK system represents a powerful new gene expression tool for Streptomyces.
  • This approach is adaptable for modifying other promoters, offering broad applicability.
  • These tools will significantly advance pathway engineering and synthetic biology in Streptomyces and other microbes.