Establishment of BmoR-based biosensor to screen isobutanol overproducer

Huan Yu, Ning Wang, Wenbo Huo, Yuhong Zhang, Wei Zhang, Yu Yang, Zhenya Chen*, Yi Xin Huo

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

37 引用 (Scopus)

摘要

Background: Isobutanol, a C4 branched-chain higher alcohol, is regarded as an attractive next-generation transport fuel. Metabolic engineering for efficient isobutanol production has been achieved in many studies. BmoR, an alcohol-regulated transcription factor, mediates a σ 54 -dependent promoter P bmo of alkane monooxygenase in n-alkane metabolism of Thauera butanivorans and displays high sensitivity to C4-C6 linear alcohols and C3-C5 branched-chain alcohols. In this study, to achieve the high-level production of isobutanol, we established a screening system which relied on the combination of BmoR-based biosensor and isobutanol biosynthetic pathway and then employed it to screen isobutanol overproduction strains from an ARTP mutagenesis library. Results: Firstly, we constructed and verified a GFP-based BmoR-P bmo device responding to the isobutanol produced by the host. Then, this screening system was employed to select three mutants which exhibited higher GFP/OD 600 values than that of wild type. Significantly, GFP/OD 600 of mutant 10 was 190.7 ± 4.8, a 1.4-fold higher value than that of wild type. Correspondingly, the isobutanol titer of that strain was 1597.6 ± 129.6 mg/L, 2.0-fold higher than the wild type. With the overexpression of upstream pathway genes, the isobutanol production from mutant 10 reached 14.0 ± 1.0 g/L after medium optimization in shake flask. The isobutanol titer reached 56.5 ± 1.8 g/L in a fed-batch production experiment. Conclusions: This work screened out isobutanol overproduction strains from a mutagenesis library by using a screening system which depended on the combination of BmoR-based biosensor and isobutanol biosynthetic pathway. Optimizing fermentation condition and reinforcing upstream pathway could realize the increase of isobutanol production from the overproducer. Lastly, fed-batch fermentation of the mutant enhanced the isobutanol production to 56.5 ± 1.8 g/L.

源语言英语
文章编号30
期刊Microbial Cell Factories
18
1
DOI
出版状态已出版 - 7 2月 2019

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