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Ethanol production by engineered thermophiles.

Daniel G Olson1, Richard Sparling2, Lee R Lynd1

  • 1Thayer School of Engineering at Dartmouth College, Hanover, NH 03755, United States; BioEnergy Science Center, Oak Ridge, TN 37830, United States.

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Summary

Engineering thermophilic microbes for high-yield ethanol production is achievable via native gene modulation for pyruvate decarboxylase (PDC), pyruvate dehydrogenase (PDH), and pyruvate ferredoxin oxidoreductase (PFOR) pathways. Transferring these pathways to other organisms remains challenging due to enzyme complexity.

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Area of Science:

  • Biotechnology
  • Microbial Engineering
  • Synthetic Biology

Background:

  • Ethanol production is a key biofuel process.
  • Thermophilic microorganisms offer advantages for industrial applications.
  • Pyruvate metabolism can yield ethanol through four distinct enzymatic pathways.

Purpose of the Study:

  • To compare strategies for engineering thermophilic microorganisms for enhanced ethanol production.
  • To identify successful engineering approaches for high-yield ethanol synthesis.
  • To assess the feasibility of transferring ethanol production pathways to non-native hosts.

Main Methods:

  • Review and comparison of existing engineering strategies for thermophilic ethanol production.
  • Analysis of four pyruvate dissimilation pathways: pyruvate decarboxylase (PDC), pyruvate dehydrogenase (PDH), pyruvate formate lyase (PFL), and pyruvate ferredoxin oxidoreductase (PFOR).
  • Evaluation of gene expression modulation in native organisms.

Main Results:

  • High yields (>90% theoretical maximum) for ethanol production were achieved using PDC, PDH, and PFOR pathways.
  • Successful engineering primarily involved modulating the expression of native genes.
  • No examples were found where a thermophilic ethanol pathway was successfully transferred to a non-ethanol-producing organism for high-yield production.

Conclusions:

  • Modulating native gene expression is effective for enhancing ethanol production in thermophiles via specific pathways.
  • Transferring thermophilic ethanol production pathways to new hosts is currently limited by a lack of understanding of the involved enzymes.