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代谢工程改造酿酒酵母提高法尼醇产量
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国家重点研发计划(2019YFA0905700)


Metabolic engineering of Saccharomyces cerevisiae to improve farnesol production
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    摘要:

    [目的] 法尼醇(FOH,C15H26O)是一种具有芳香气味的非环状倍半萜醇,被广泛应用于化妆品和医学药物的工业化生产,也可作为航空燃料的理想替代品。具有食品级安全性的酿酒酵母细胞能够合成内源性法尼醇,但其产量很低,无法满足工业生产的需要。因此,需要采用代谢工程手段,改造法尼醇合成途径,以有效提高法尼醇在酿酒酵母中的产量。[方法] 以酿酒酵母工业菌株CEN.PK2-1D为底盘细胞,强化甲羟戊酸途径中关键酶的表达水平和弱化麦角固醇合成分支途径,以提高法尼醇合成所需的直接前体物质法尼基焦磷酸(FPP);并分别表达催化FPP合成法尼醇的五种内源磷酸酶和两种异源合酶,筛选能高效合成法尼醇的磷酸酶或合酶。[结果] 通过在CEN.PK2-1D(法尼醇产量<0.1 mg/L)中强化表达甲羟戊酸途径中截短形式的HMG-CoA还原酶(tHMGR1)和FPP合酶(ERG20),使法尼醇产量提高约50.8倍,达到5.08 mg/L;使用HXT1启动子替换鲨烯合酶编码基因ERG9启动子以下调其表达水平,使法尼醇产量进一步提升47.1倍,达到239.17 mg/L。在此基础上,筛选发现,表达酿酒酵母内源性磷酸酶PAH1时,获得最高产量法尼醇,达到393.13 mg/L。[结论] 采用代谢工程策略对酿酒酵母法尼醇合成途径进行改造,有效提高法尼醇产量至393.13 mg/L,为目前报道的在酿酒酵母中摇瓶培养条件下的最高产量。

    Abstract:

    [Objective] Farnesol (FOH, C15H26O) is a natural acyclic sesquiterpene alcohol with an aromatic odor. It is widely used in the industrial production of cosmetics and pharmaceuticals and also considered as an aviation jet-fuel substitute. Although food-grade S. cerevisiae can synthesize endogenous FOH, the yield is too low to meet the requirements for industrial production. Therefore, in this work, the FOH synthesis pathway in S. cerevisiae was metabolically engineered to overproduce FOH. [Methods] To improve the intracellular level of farnesyl pyrophosphate (FPP), the direct precursor for FOH synthesis, the mevalonate pathway in S. cerevisiae CEN.PK2-1D was enhanced via constitutive overexpression of genes encoding the two key enzymes whereas the ergosterol pathway was weakened by replacing the EGR9 promoter with the HXT1 promoter. In addition, five genes encoding endogenous phosphatases and two heterologous synthases that could catalyze FOH synthesis, were individually overexpressed to determine the enzyme with optimum performance. [Results] Shake flask culture experiments showed that constitutive overexpression of genes encoding the truncated HMG-CoA reductase (tHMGR1) and the FPP synthase ERG20 in S. cerevisiae CEN.PK2-1D increased the production of FOH by 50.8 fold to reach 5.08 mg/L. Down-regulation of the squalene synthase encoding gene ERG9, by replacing its promoter with the HXT1 promoter, further increased the FOH titer to 239.17 mg/L. On this basis, a maximum yield of FOH (393.13 mg/L) was obtained when the endogenous phosphatase PAH1 was overexpressed. [Conclusion] In this study, metabolic engineering of S. cerevisiae was used to increase the production titer of FOH to 393.13 mg/L. This is the highest reported yield of FOH from S. cerevisiae under shake flask culture conditions.

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郭俊琪,王征,张伟欣,刘巍峰. 代谢工程改造酿酒酵母提高法尼醇产量. 微生物学报, 2021, 61(5): 1257-1268

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  • 收稿日期:2020-06-03
  • 最后修改日期:2020-07-29
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  • 在线发布日期: 2021-05-07
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