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Related Experiment Video

Updated: Oct 30, 2025

Procedure for Adaptive Laboratory Evolution of Microorganisms Using a Chemostat
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Biosensor-Assisted Adaptive Laboratory Evolution for Violacein Production.

Da-Ae Gwon1, Joo Yeon Seok2, Gyoo Yeol Jung1,2

  • 1Department of Chemical Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Korea.

International Journal of Molecular Sciences
|July 2, 2021
PubMed
Summary

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This study enhanced violacein production in Escherichia coli using biosensor-assisted adaptive laboratory evolution (ALE). The evolved strain efficiently converts galactose to tryptophan, leading to significantly improved violacein yields.

Area of Science:

  • Microbial Biotechnology
  • Metabolic Engineering
  • Pigment Production

Background:

  • Violacein, a natural purple pigment with cosmetic, antibacterial, and antiviral applications, is synthesized from tryptophan.
  • Tryptophan overproduction in Escherichia coli is challenging due to complex biosynthetic pathways and regulatory mechanisms.
  • Efficient violacein production requires optimized tryptophan biosynthesis.

Purpose of the Study:

  • To improve violacein production in Escherichia coli.
  • To overcome challenges in tryptophan overproduction for enhanced pigment yield.
  • To utilize adaptive laboratory evolution (ALE) with a tryptophan-responsive biosensor.

Main Methods:

  • Employed adaptive laboratory evolution (ALE) with galactose as the carbon source.
Keywords:
adaptive laboratory evolutionbiosensortryptophanviolacein

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  • Utilized a tryptophan-responsive biosensor to apply selection pressure for tryptophan-producing cells.
  • Performed whole-genome sequencing to identify beneficial mutations in the evolved strain.

    • Main Results:

    • Obtained an evolved cell population capable of efficient galactose catabolism to tryptophan.
    • Successfully isolated a high-yield violacein producer from the evolved population.
    • Identified specific point mutations contributing to enhanced tryptophan and violacein production.

    Conclusions:

    • Biosensor-assisted ALE is an effective strategy for rapid and selective evolution of microbial producers.
    • This approach significantly enhances violacein production yields.
    • The identified mutations provide insights for future metabolic engineering strategies.