Abstract
2,3-Dihydroxyisovalerate is an intermediate of valine and leucine biosynthesis pathway; however, no natural microorganism has been found yet that can accumulate this compound. Klebsiella pneumoniae is a useful bacterium that can be used as a workhorse for the production of a range of industrially desirable chemicals. Dihydroxy acid dehydratase, encoded by the ilvD gene, catalyzes the reaction of 2-ketoisovalerate formation from 2,3-dihydroxyisovalerate. In this study, an ilvD disrupted strain was constructed which resulted in the inability to synthesize 2-ketoisovalerate, yet accumulate 2,3-dihydroxyisovalerate in its culture broth. 2,3-Butanediol is the main metabolite of K. pneumoniae and its synthesis pathway and the branched-chain amino acid synthesis pathway share the same step of the α-acetolactate synthesis. By knocking out the budA gene, carbon flow into the branched-chain amino acid synthesis pathway was upregulated, which resulted in a distinct increase in 2,3-dihydroxyisovalerate levels. Lactic acid was identified as a by-product of the process and by blocking the lactic acid synthesis pathway, a further increase in 2,3-dihydroxyisovalerate levels was obtained. The culture parameters of 2,3-dihydroxyisovalerate fermentation were optimized, which include acidic pH and medium level oxygen supplementation to favor 2,3-dihydroxyisovalerate synthesis. At optimal conditions (pH 6.5, 400 rpm), 36.5 g/L of 2,3-dihydroxyisovalerate was produced in fed-batch fermentation over 45 h, with a conversion ratio of 0.49 mol/mol glucose. Thus, a biological route of 2,3-dihydroxyisovalerate production with high conversion ratio and final titer was developed, providing a basis for an industrial process.
Key Points • A biological route of 2,3-dihydroxyisovalerate production was setup. • Disruption of budA causes 2,3-dihydroxuisovalerate accumulation in K. pneumoniae. • Disruption of ilvD prevents 2,3-dihydroxyisovalerate reuse by the cell. • 36.5 g/L of 2,3-dihydroxyisovalerate was obtained in fed-batch fermentation. |
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Funding
This study was funded by the National Key R&D Program of China (Grant No. 2017YFE0112700), Royal Society-Newton Advanced Fellowship (Grant No. NAF\R2\180721), Natural Science Foundation of Shanghai (Grant No. 19ZR1463600), and National Natural Science Foundation of China (Grant No. 21576279). FB would like to thank the Chinese Academy of Sciences for the award of a President’s International Fellowship Initiative (Grant No. 2019VCB0007).
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JH, GL, and FB designed this study. YW, JG, XL, ZZ, YY, and SS conducted the research. YW, JG, JP, MG, FB, GL, and JH analyzed the data. YW, EK, FB, and JH wrote the manuscript. All authors read and approved the final manuscript.
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Wang, Y., Gu, J., Lu, X. et al. 2,3-Dihydroxyisovalerate production by Klebsiella pneumoniae. Appl Microbiol Biotechnol 104, 6601–6613 (2020). https://doi.org/10.1007/s00253-020-10711-y
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DOI: https://doi.org/10.1007/s00253-020-10711-y