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- W2607941379 abstract "The growth and production of yeast in the industrial fermentation are seriously restrained by heat stress and exacerbated by heat induced oxidative stress. In this study, a novel synthetic biology approach was developed to globally boost the viability and production ability of S. cerevisiae at high temperature through rationally designing and combing heat shock protein (HSP) and superoxide dismutase (SOD) genetic devices to ultimately synergistically alleviate both heat stress and oxidative stress. HSP and SOD from extremophiles were constructed to be different genetic devices and they were preliminary screened by heat resistant experiments and anti-oxidative experiments, respectively. Then in order to customize and further improve thermotolerance of S. cerevisiae, the HSP genetic device and SOD genetic device were rationally combined. The results show the simply assemble of the same function genetic devices to solve heat stress or oxidative stress could not enhance the thermotolerance considerably. Only S. cerevisiae with the combination genetic device (FBA1p-sod-MB4-FBA1p-shsp-HB8) solving both stress showed 250% better thermotolerance than the control and displayed further 55% enhanced cell density compared with the strains with single FBA1p-sod-MB4 or FBA1p-shsp-HB8 at 42 °C. Then the most excellent combination genetic device was introduced into lab S. cerevisiae and industrial S. cerevisiae for ethanol fermentation. The ethanol yields of the two strains were increased by 20.6% and 26.3% compared with the control under high temperature, respectively. These results indicate synergistically defensing both heat stress and oxidative stress is absolutely necessary to enhance the thermotolerance and production of S. cerevisiae." @default.
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- W2607941379 date "2017-06-01" @default.
- W2607941379 modified "2023-10-16" @default.
- W2607941379 title "Rational synthetic combination genetic devices boosting high temperature ethanol fermentation" @default.
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- W2607941379 doi "https://doi.org/10.1016/j.synbio.2017.04.003" @default.
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