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Light-Controlled Fermentations for Microbial Chemical and Protein Production
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Published on: March 22, 2022

Rewiring carbon catabolite repression for microbial cell factory.

Parisutham Vinuselvi1, Min Kyung Kim, Sung Kuk Lee

  • 1School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea.

BMB Reports
|February 25, 2012
PubMed
Summary

Carbon catabolite repression (CCR) ensures microbes use preferred sugars first. Understanding CCR is key to improving bioproduct yields from mixed sugars like lignocellulose.

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Area of Science:

  • Microbiology
  • Metabolic Engineering
  • Biotechnology

Background:

  • Carbon catabolite repression (CCR) is a vital microbial regulatory system for preferential carbon source utilization.
  • CCR balances metabolic capacity with sugar uptake, aiding survival in natural environments.
  • CCR poses a significant challenge in industrial bioprocessing, particularly with mixed carbon sources like lignocellulose.

Purpose of the Study:

  • To provide a comprehensive review of CCR mechanisms, including universal and strain-specific features.
  • To highlight the role of CCR as a bottleneck in microbial bioproduct fermentation.
  • To discuss strategies for overcoming CCR in synthetic cell factories for lignocellulose-based biorefineries.

Main Methods:

  • Comparative review of existing literature on Carbon Catabolite Repression (CCR).
  • Analysis of CCR circuitry in various microorganisms.
  • Discussion of recent advancements in metabolic engineering to mitigate CCR effects.

Main Results:

  • CCR's preferential substrate uptake limits the efficiency of fermentation processes using mixed carbon sources.
  • Unutilized substrates can accumulate, complicating downstream product purification.
  • A systemic understanding of CCR molecular interactions is crucial for strain development.

Conclusions:

  • Overcoming CCR is essential for enhancing yields and productivity in microbial bioproduct manufacturing.
  • Developing CCR-deficient microbial strains is a promising strategy for lignocellulose-based biorefineries.
  • Further research into CCR's molecular intricacies will enable the design of advanced synthetic cell factories.