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首页> 外文期刊>Bioprocess and Biosystems Engineering >Mevalonate production by engineered acetogen biocatalyst during continuous fermentation of syngas or CO_2/H_2 blend
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Mevalonate production by engineered acetogen biocatalyst during continuous fermentation of syngas or CO_2/H_2 blend

机译:在合成气或CO_2 / H_2共混物连续发酵过程中,由工程化的乙酸原生物催化剂生产的甲羟戊酸

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摘要

Naturally mevalonate-resistant acetogen Clos-tridium sp. MT1243 produced only 425 mM acetate during syngas fermentation. Using Clostridium sp. MT1243 we engineered biocatalyst selectively producing mevalonate from synthesis gas or CO_2/H_2 blend. Acetate production and spore formation were eliminated from Clostridium sp. MT1243 using Cre-lox66/lox71-system. Cell energy released via elimination of phosphotransacetylase, acetate kinase and early stage sporulation genes powered mevalonate accumulation in fermentation broth due to expression of synthetic thiolase, HMG-synthase, and HMG-reductase, three copies of each, integrated using Tn7-approach. Recombinants produced 145 mM mevalonate in five independent single-step fermentation runs 25 days each in five repeats using syngas blend 60 % CO and 40 % H_2 (v/v) (p < 0.005). Mevalonate production was 97 mM if only CO_2/H_2 blend was fed instead of syngas (p < 0.005). Mevalonate from CO_2/H_2 blend might serve as a commercial route to mitigate global warming in proportion to CO_2 fermentation scale worldwide.
机译:天然的耐甲羟戊酸的丙酮原Clos-tridium sp。在合成气发酵期间,MT1243仅产生425 mM乙酸盐。使用梭状芽孢杆菌我们设计了MT1243生物催化剂,可从合成气或CO_2 / H_2混合物中选择性生产甲羟戊酸。从梭状芽胞杆菌中消除了乙酸的产生和孢子的形成。 MT1243使用Cre-lox66 / lox71系统。由于合成硫解酶,HMG合酶和HMG还原酶的表达,通过消除磷酸转乙酰酶,乙酸激酶和早期孢子形成基因而释放的细胞能量推动了甲羟戊酸在发酵液中的积累,每种都三个拷贝,使用Tn7方法整合。重组子使用60%CO和40%H_2(v / v)的合成气混合液,在五个独立的单步发酵过程中,每五个重复进行25天,产生了145 mM甲羟戊酸(p <0.005)。如果仅加入CO_2 / H_2混合物而不是合成气,则甲羟戊酸的产量为97 mM(p <0.005)。与全球CO_2发酵规模成比例,来自CO_2 / H_2共混物的甲羟戊酸可能是缓解全球变暖的商业途径。

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