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Engineering stilbene metabolic pathways in microbial cells.

Philippe Jeandet1, Eduardo Sobarzo-Sánchez2, Christophe Clément1

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Microbial cell cultures are engineered to produce stilbenes, overcoming limitations of traditional synthesis and extraction. This review details 15 years of advancements in microbial stilbene production for pharmaceutical and nutraceutical applications.

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Area of Science:

  • Natural Product Chemistry
  • Metabolic Engineering
  • Synthetic Biology

Background:

  • Phytostilbenes exhibit significant biological activities, driving interest in their pharmaceutical and nutraceutical applications.
  • Current methods for obtaining stilbenes via chemical synthesis or plant extraction face limitations in yield and scalability.
  • Microbial cell cultures offer a promising alternative for efficient and scalable stilbene production.

Purpose of the Study:

  • To review the progress in engineering microbial cell factories for stilbene biosynthesis over the past 15 years.
  • To highlight strategies for overcoming metabolic bottlenecks and optimizing precursor flow in engineered microbes.
  • To discuss the role of bioinformatics and enzyme engineering in enhancing microbial stilbene production.

Main Methods:

  • Heterologous expression of stilbene biosynthetic pathways in microbial hosts like Saccharomyces cerevisiae, Escherichia coli, and Corynebacterium glutamicum.
  • Metabolic engineering approaches including gene regulation, precursor pathway optimization, and bottleneck identification.
  • Integration of bioinformatics tools for predicting gene targets and pathway modifications.
  • Enzyme engineering using methyltransferases, glycosyltransferases, and hydroxylases to modify the stilbene core structure.

Main Results:

  • Engineered microbial strains have achieved significant stilbene titers, ranging from milligrams to gram-scale yields.
  • Successful identification and bypassing of major bottlenecks in endogenous microbial metabolism.
  • Optimization of precursor supply and metabolic flux towards stilbene production.
  • Demonstrated ability to produce complex, decorated stilbene derivatives through sequential enzymatic modifications.

Conclusions:

  • Microbial production represents a viable and scalable strategy for obtaining valuable stilbenes.
  • Advanced metabolic engineering and synthetic biology approaches have significantly improved stilbene yields.
  • Future research should focus on further optimizing microbial chassis and expanding the diversity of microbial-produced stilbenes.