Engineering of acetyl-CoA metabolism for the improved production of polyhydroxybutyrate in Saccharomyces cerevisiae.

Engineering of acetyl-CoA metabolism for the improved production of polyhydroxybutyrate in Saccharomyces cerevisiae.
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DOI:
10.1186/2191-0855-2-52
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发表时间:
2012-09-25
期刊:
影响因子:
3.7
通讯作者:
Nielsen J
Nielsen J
中科院分区:
工程技术3区
文献类型:
--
作者:
Kocharin K;Chen Y;Siewers V;Nielsen J

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通过代谢工程,微生物可以被工程化以生产新产品,并且进一步以更高的产量和生产率生产这些产品。在这里,我们表达的细菌聚羟基丁酸酯(PHB)途径在酵母酿酒酵母,我们进一步评估的效果工程形成的乙酰辅酶A(乙酰辅酶A),中间的中心碳代谢和前体的PHB途径,对异源聚羟基丁酸酯生产酵母。我们通过共转化含有天然S.酿酒酵母醇脱氢酶(ADH 2)、乙醛脱氢酶(ALD 6)、乙酰辅酶A乙酰转移酶(ERG 10)和肠道沙门氏菌乙酰辅酶A合成酶变体(acsL 641 P),导致乙酰乙酰辅酶A过量产生,以及含有编码乙酰辅酶A乙酰转移酶(phaA)的PHB途径基因的质粒,来自真养Ralstonia eutropha H16的NADPH连接的乙酰乙酰CoA还原酶(phaB)和聚(3-羟基丁酸)聚合酶(phaC)。与本研究中使用的参考菌株相比,将乙酰辅酶A质粒与PHB质粒一起引入,将PHB的生产率提高了16倍以上,并且它减少了副产物的特异性产物形成。
Through metabolic engineering microorganisms can be engineered to produce new products and further produce these with higher yield and productivities. Here, we expressed the bacterial polyhydroxybutyrate (PHB) pathway in the yeast Saccharomyces cerevisiae and we further evaluated the effect of engineering the formation of acetyl coenzyme A (acetyl-CoA), an intermediate of the central carbon metabolism and precursor of the PHB pathway, on heterologous PHB production by yeast. We engineered the acetyl-CoA metabolism by co-transformation of a plasmid containing genes for native S. cerevisiae alcohol dehydrogenase (ADH2), acetaldehyde dehydrogenase (ALD6), acetyl-CoA acetyltransferase (ERG10) and a Salmonella enterica acetyl-CoA synthetase variant (acsL641P), resulting in acetoacetyl-CoA overproduction, together with a plasmid containing the PHB pathway genes coding for acetyl-CoA acetyltransferase (phaA), NADPH-linked acetoacetyl-CoA reductase (phaB) and poly(3-hydroxybutyrate) polymerase (phaC) from Ralstonia eutropha H16. Introduction of the acetyl-CoA plasmid together with the PHB plasmid, improved the productivity of PHB more than 16 times compared to the reference strain used in this study, as well as it reduced the specific product formation of side products.
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DOI: 10.1371/journal.pone.0042475
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期刊: PloS one
影响因子: 3.7
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