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Biofuels. Engineering alcohol tolerance in yeast.

Felix H Lam1, Adel Ghaderi2, Gerald R Fink3

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Strengthening yeast membrane gradients enhances ethanol tolerance and bioethanol production. This involves increasing extracellular potassium and pH, improving yeast viability and fermentation under industrial conditions.

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Area of Science:

  • Biochemistry
  • Microbiology
  • Biotechnology

Background:

  • Ethanol toxicity in Saccharomyces cerevisiae hinders industrial bioethanol production.
  • Improving yeast tolerance to ethanol is crucial for efficient biofuel synthesis.

Purpose of the Study:

  • To investigate if strengthening electrochemical membrane gradients enhances yeast alcohol tolerance.
  • To determine if this mechanism improves ethanol fermentation in industrial settings.

Main Methods:

  • Manipulating extracellular potassium and pH levels to bolster membrane gradients.
  • Assessing ethanol tolerance and fermentation performance in various yeast strains under industrial conditions.
  • Evaluating population viability and production per cell.

Main Results:

  • Elevating extracellular potassium and pH significantly increased yeast tolerance to ethanol and other alcohols.
  • Enhanced tolerance led to improved ethanol fermentation in commercial and laboratory strains, including a xylose-fermenting strain.
  • Improvements in fermentation were primarily due to increased population viability, not production per cell.

Conclusions:

  • Strengthening potassium and proton electrochemical gradients is a key mechanism for enhancing yeast alcohol tolerance.
  • This physicochemical approach, amenable to biological augmentation, offers a viable strategy to boost bioethanol production.
  • Targeting membrane gradient stability can overcome limitations imposed by ethanol toxicity in industrial fermentation.