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Tunable Gene Expression System Independent of Downstream Coding Sequence.

Seung Min Yoo1, Seung-Woon Jung1, Jinho Yeom1

  • 1School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea.

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A new tunable gene-expression system precisely controls protein levels, independent of coding sequences. This breakthrough enables optimized synthetic biology circuits and enhanced bioproduct yields in metabolic engineering.

Keywords:
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Area of Science:

  • Synthetic biology
  • Metabolic engineering
  • Molecular biology

Background:

  • Precise control of protein expression is crucial for synthetic biology and metabolic engineering.
  • Predicting protein expression from mRNA is challenging due to dependence on downstream coding sequences (CDS).

Purpose of the Study:

  • To develop a tunable gene-expression system for predictable protein level control.
  • To demonstrate the system's utility in synthetic circuits and metabolic engineering applications.

Main Methods:

  • Designed 24 expression cassettes for tunable protein expression (0.001 to 1 relative levels).
  • Validated the system using a synthetic circuit with three fluorescence states.
  • Applied the system to diversify metabolic enzyme levels for bioproduct enhancement.

Main Results:

  • Achieved predefined relative protein expression levels unaffected by downstream CDS.
  • Successfully created a synthetic circuit with distinct fluorescence outputs.
  • Enhanced production of cadaverine (2.25 g/L), L-proline (2.59 g/L), and 1-propanol (95.7 mg/L).

Conclusions:

  • The tunable gene-expression system offers precise control for optimizing genetic circuits.
  • This system can enhance metabolic engineering by diversifying enzyme levels and improving bioproduct yields.
  • The system is valuable for basic and applied biological research, synthetic biology, and metabolic engineering.