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• W3048503210 endingPage "109650" @default.
• W3048503210 startingPage "109650" @default.
• W3048503210 abstract "2,3-Dihydroxyisovalerate is an intermediate of the valine synthesis pathway. However, neither natural microorganisms nor valine producing engineered strains have been reported yet to produce this chemical. Based on the 2,3-butanediol synthesis pathway, a biological route of 2,3-dihydroxyisovalerate production was developed using a budA and ilvD disrupted Klebsiella pneumoniae strain in our previous research. We hypothesised, that other 2,3-butanediol producing bacteria could be used for 2,3-dihydroxyisovalerate production. Here a budA disrupted Enterobacter cloacae was constructed, and this strain exhibited a high 2,3-dihydroxyisovalerate producing ability. Disruption of ilvD in E. cloacae ΔbudA further increased 2,3-dihydroxyisovalerate level. The disruption of budA, encoding an acetolactate decarboxylase, resulted in the acetolactate synthesized in the 2,3-butanediol synthesis pathway to flow into the valine synthesis pathway. The additional disruption of ilvD, encoding a dihydroxy acid dehydratase, prevented the 2,3-dihydroxyisovalerate to be further metabolized in the valine synthesis pathway. Thus, the disruption of both budA and ilvD in 2,3-butanediol producing strains might be an universal strategy for 2,3-dihydroxyisovalerate accumulation. After optimization of the medium components and culture parameters 31.2 g/L of 2,3-dihydroxyisovalerate was obtained with a productivity of 0.41 g/L h and a substrate conversion ratio of 0.56 mol/mol glucose in a fed-batch fermentation. This approach provides an economic way for 2,3-dihydroxyisovalerate production." @default.
• W3048503210 created "2020-08-18" @default.
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• W3048503210 date "2020-10-01" @default.
• W3048503210 modified "2023-10-06" @default.
• W3048503210 title "Production of 2,3-dihydroxyisovalerate by Enterobacter cloacae" @default.
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• W3048503210 doi "https://doi.org/10.1016/j.enzmictec.2020.109650" @default.
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