Engineering alcohol tolerance in yeast
Ethanol toxicity in the yeast Saccharomyces cerevisiae limits titer and productivity in the industrial production of transportation bioethanol. We show that strengthening the opposing potassium and proton electrochemical membrane gradients is a mechanism that enhances general resistance to multiple...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2014-10, Vol.346 (6205), p.71-75 |
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| creator | Lam, Felix H. Ghaderi, Adel Fink, Gerald R. Stephanopoulos, Gregory |
| description | Ethanol toxicity in the yeast Saccharomyces cerevisiae limits titer and productivity in the industrial production of transportation bioethanol. We show that strengthening the opposing potassium and proton electrochemical membrane gradients is a mechanism that enhances general resistance to multiple alcohols. The elevation of extracellular potassium and pH physically bolsters these gradients, increasing tolerance to higher alcohols and ethanol fermentation in commercial and laboratory strains (including a xylose-fermenting strain) under industrial-like conditions. Production per cell remains largely unchanged, with improvements deriving from heightened population viability. Likewise, up-regulation of the potassium and proton pumps in the laboratory strain enhances performance to levels exceeding those of industrial strains. Although genetically complex, alcohol tolerance can thus be dominated by a single cellular process, one controlled by a major physicochemical component but amenable to biological augmentation. |
| doi_str_mv | 10.1126/science.1257859 |
| format | Article |
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We show that strengthening the opposing potassium and proton electrochemical membrane gradients is a mechanism that enhances general resistance to multiple alcohols. The elevation of extracellular potassium and pH physically bolsters these gradients, increasing tolerance to higher alcohols and ethanol fermentation in commercial and laboratory strains (including a xylose-fermenting strain) under industrial-like conditions. Production per cell remains largely unchanged, with improvements deriving from heightened population viability. Likewise, up-regulation of the potassium and proton pumps in the laboratory strain enhances performance to levels exceeding those of industrial strains. 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| source | American Association for the Advancement of Science; Jstor Complete Legacy |
| subjects | alcohol tolerance Alcohols BASIC BIOLOGICAL SCIENCES Cellular engineering Ethanol Ethyl alcohol evolution fuels Genetic engineering Laboratories Potassium Saccharomyces cerevisiae temperature Tolerances Toxicity Yeast yeasts |
| title | Engineering alcohol tolerance in yeast |
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