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Summary
This summary is machine-generated.

This study engineered Candida glycerinogenes for geraniol production, achieving high titers from lignocellulosic biomass. The developed system redirects carbon flux, enabling sustainable synthesis of this valuable aroma compound.

Keywords:
Candida glycerinogenesgeraniollignocellulosic biomassmetabolic engineeringxylose metabolism

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Area of Science:

  • Metabolic Engineering
  • Synthetic Biology
  • Industrial Biotechnology

Background:

  • Geraniol is a valuable natural product widely used in the aroma industry.
  • Existing production methods face competition from endogenous metabolic pathways, such as the yeast ergosterol pathway.
  • Sustainable production of geraniol from renewable resources is highly desirable.

Purpose of the Study:

  • To develop a transcription factor-mediated system for autonomous regulation of ergosterol metabolism.
  • To redirect carbon flux towards geraniol synthesis in Candida glycerinogenes.
  • To enable sustainable geraniol production from lignocellulosic biomass.

Main Methods:

  • Engineered a transcription factor-mediated ergosterol feedback system to regulate ergosterol metabolism.
  • Modified ergosterol-responsive promoters and optimized transcription factor expression.
  • Constructed and optimized a xylose assimilation pathway in Candida glycerinogenes, activating the pentose phosphate pathway.

Main Results:

  • Achieved a geraniol titer of 531.7 mg L-1 through metabolic engineering and promoter optimization.
  • Successfully produced geraniol from lignocellulosic biomass (simulated wheat straw and sugarcane bagasse hydrolysates).
  • Obtained high geraniol titers (up to 1091.6 mg L-1 on glucose) and yields (up to 59.1 mg g-1 DCW) in a 5 L bioreactor.

Conclusions:

  • Candida glycerinogenes can be engineered for efficient geraniol production.
  • The developed transcription factor-mediated system effectively redirects metabolic flux for enhanced geraniol synthesis.
  • This study demonstrates the potential for producing geraniol and other monoterpenes from lignocellulosic biomass, offering a sustainable bioproduction platform.