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- W2552173726 abstract "Isoamyl alcohol can be used not only as a biofuel, but also as a precursor for various chemicals. Saccharomyces cerevisiae inherently produces a small amount of isoamyl alcohol via the leucine degradation pathway, but the yield is very low. In the current study, several strategies were devised to overproduce isoamyl alcohol in budding yeast. The engineered yeast cells with the cytosolic isoamyl alcohol biosynthetic pathway produced significantly higher amounts of isobutanol over isoamyl alcohol, suggesting that the majority of the metabolic flux was diverted to the isobutanol biosynthesis due to the broad substrate specificity of Ehrlich pathway enzymes. To channel the key intermediate 2-ketosiovalerate (KIV) towards α-IPM biosynthesis, we introduced an artificial protein scaffold to pull dihydroxyacid dehydratase and α-IPM synthase into the close proximity, and the resulting strain yielded more than twofold improvement of isoamyl alcohol. The best isoamyl alcohol producer yielded 522.76 ± 38.88 mg/L isoamyl alcohol, together with 540.30 ± 48.26 mg/L isobutanol and 82.56 ± 8.22 mg/L 2-methyl-1-butanol. To our best knowledge, our work represents the first study to bypass the native compartmentalized α-IPM biosynthesis pathway for the isoamyl alcohol overproduction in budding yeast. More importantly, artificial protein scaffold based on the feature of quaternary structure of enzymes would be useful in improving the catalytic efficiency and the product specificity of other enzymatic reactions." @default.
- W2552173726 created "2016-11-30" @default.
- W2552173726 creator A5032189070 @default.
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- W2552173726 date "2017-01-01" @default.
- W2552173726 modified "2023-10-05" @default.
- W2552173726 title "Engineering the leucine biosynthetic pathway for isoamyl alcohol overproduction in <i>Saccharomyces cerevisiae</i>" @default.
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- W2552173726 doi "https://doi.org/10.1007/s10295-016-1855-2" @default.
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