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Artificial complementary chromatic acclimation gene expression system in Escherichia coli.

Dwi Ariyanti1,2, Kazunori Ikebukuro3, Koji Sode4

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Researchers developed a novel artificial complementary chromatic acclimation (CCA) system for precise control of gene expression using red and green light. This system enables repeatable, light-regulated expression of multiple genes in E. coli, offering potential for metabolic engineering.

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Artificial complementary chromatic acclimationCcaS/CcaREscherichia coliGene expression system

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biotechnology

Background:

  • Developing controllable multiple gene expression systems using physical signals like light is challenging.
  • Complementary Chromatic Acclimation (CCA) in cyanobacteria offers a photoreversible process for light-based gene expression control.
  • This study focuses on an artificial CCA system inspired by type III CCA mechanisms.

Purpose of the Study:

  • To design and construct an artificial CCA system for dual-color light-regulated gene expression.
  • To utilize a single photosensor system (CcaS/CcaR) for independent control of two different genes.
  • To demonstrate the feasibility of this system in Escherichia coli.

Main Methods:

  • Engineered a system using the CcaS/CcaR photosensor, G-box DNA elements, and specific promoters (PtrcΔLacO and cpcG2).
  • Inserted G-boxes upstream of the cpcG2 promoter driving RFP expression (green light-induced) and between PtrcΔLacO and BFP expression (red light-induced).
  • Evaluated gene expression at transcriptional and translational levels in E. coli under alternating red and green light conditions.

Main Results:

  • Green light induced RFP gene expression while repressing BFP gene expression.
  • Red light induced BFP gene expression while repressing RFP gene expression.
  • The system demonstrated reversible and repeatable control over both reporter genes during light cycles.

Conclusions:

  • An artificial CCA system was successfully developed in E. coli, enabling dual-color (red and green light) gene expression control.
  • The system functions repeatedly and reversibly, demonstrating its potential for applications in metabolic engineering.
  • This light-inducible gene expression system can be applied to various microorganisms, including cyanobacteria, for producing multiple metabolites.