Researchers at Colorado State University have developed a method to improve ethanol production in yeast through the use of specific molecules. By adding inexpensive quorum-sensing molecules that naturally control yeast growth, ethanol yields increased by up to 15% without genetic modification. This technique redirects carbon resources away from cell growth, maximizing the output of ethanol and improving the sustainability of the bioprocess. This approach may lead to higher production yields of bioethanol and other valuable fermentation products.
As global bioethanol demand rises, efficient production becomes critical for sustainable energy and chemical manufacturing. The yeast Saccharomyces cerevisiae, commonly used for ethanol production, typically allocates part of its carbon resources to cell growth, reducing overall ethanol yield. Many strategies rely on genetic modification, which can create unstable phenotypes. This CSU research introduces a non-genetic approach using quorum-sensing molecules, which naturally limit cell growth and redirect carbon toward ethanol, representing a promising advance in bioethanol production technology.
The CSU research team explored using quorum-sensing molecules (QSMs), specifically 2-phenylethanol, tryptophol, and tyrosol, to control yeast cell growth and increase ethanol yield. Through preliminary screenings and controlled fermentations, these QSMs demonstrated the ability to slow cell growth while maintaining and enhancing ethanol output. By limiting biomass production, ethanol yield improved by up to 15% across different yeast strains in comparison to control fermentations. This technique leverages naturally occurring growth inhibitors in yeast, eliminating the need for complex genetic modifications while maintaining the strain’s resilience and adaptability. The addition of QSMs was also shown to reduce glycerol yield by over 20%, further increasing the efficiency of carbon utilization toward ethanol production.
X. Huang, et al (2021) “Quorum-sensing molecules increase ethanol yield from Saccharomyces cerevisiae.” FEMS Yeast Research. https://doi.org/10.1093/femsyr/foab056.
X. Huang, et al (2021) “Strategies to achieve high productivity, high conversion, and high yield in yeast fermentation of algal biomass hydrolysate.” Engineering in Life Sciences. http://dx.doi.org/10.1002/elsc.202100095.
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Ken Reardon
Xingfeng Huang
Jessy McGowan
jessy.mcgowan@colostate.edu