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1-Butanol production from glycerol by engineered Klebsiella pneumoniae

机译:工程化肺炎克雷伯菌由甘油生产1-丁醇

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摘要

To utilize the by-product of biodiesel production, Klebsiella pneumoniae, a well-known glycerolfermenting microorganism, was engineered to produce 1-butanol. The modified CoA-dependent and 2-keto acid pathways were established by expressing the genes ter-bdhB-bdhA and kivd, respectively. The 1-butanol titer and specific BuOH yield were 15.03 mg L-1 and 27.79 mg-BuOH per g cell in KpTBB (K. pneumoniae overexpressing the genes ter-bdhB-bdhA), and 28.7 mg L-1 and 51.58 mg-BuOH per g cell in Kp-kivd (K. pneumoniae overexpressing the gene kivd), respectively. Moreover, the native products in K. pneumoniae fermentation were down regulated using the antisense RNA strategy. The resulting yield of 1,3-propanediol and 2,3-butanediol was reduced by 81% and 15%, respectively. This work reports a new strain, K. pneumoniae, for 1-butanol production and the application of an antisense RNA strategy as an effective method for reducing the main by-products.
机译:为了利用生物柴油生产的副产物,将肺炎克雷伯菌(Klebsiella pneumoniae)(一种著名的甘油发酵微生物)工程化以生产1-丁醇。通过分别表达基因ter-bdhB-bdhA和kivd,建立了修饰的CoA依赖性和2-酮酸途径。 1-丁醇滴度和特定的BuOH产量分别为每克KpTBB(肺炎克雷伯菌过表达ter-bdhB-bdhA基因)每克细胞15.03 mg L-1和27.79 mg-BuOH,以及28.7 mg L-1和51.58 mg-BuOH在Kp-kivd(过表达基因kivd的肺炎克雷伯氏菌)中每g细胞中的每克细胞。此外,使用反义RNA策略下调了肺炎克雷伯菌发酵中的天然产物。所得的1,3-丙二醇和2,3-丁二醇的产率分别降低了81%和15%。这项工作报告了一种用于生产1-丁醇的新型肺炎克雷伯氏菌,并且应用了反义RNA策略作为减少主要副产物的有效方法。

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