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Improving the production of isoprene and 1,3-propanediol by metabolically engineered Escherichia coli through recycling redox cofactor between the dual pathways

  • Jing Guo
  • Yujin Cao
  • Hui Liu
  • Rubing Zhang
  • Mo XianEmail author
  • Huizhou LiuEmail author
Biotechnological products and process engineering
  • 42 Downloads

Abstract

The biosynthesis of isoprene by microorganisms is a promising green route. However, the yield of isoprene is limited due to the generation of excess NAD(P)H via the mevalonate (MVA) pathway, which converts more glucose into CO2 or undesired reduced by-products. The production of 1,3-propanediol (1,3-PDO) from glycerol is a typical NAD(P)H-consuming process, which restricts 1,3-PDO yield to ~ 0.7 mol/mol. In this study, we propose a strategy of redox cofactor balance by coupling the production of isoprene with 1,3-PDO fermentation. With the introduction and optimization of the dual pathways in an engineered Escherichia coli, ~ 85.2% of the excess NADPH from isoprene pathway was recycled for 1,3-PDO production. The best strain G05 simultaneously produced 665.2 mg/L isoprene and 2532.1 mg/L 1,3-PDO under flask fermentation conditions. The yields were 0.3 mol/mol glucose and 1.0 mol/mol glycerol, respectively, showing 3.3- and 4.3-fold improvements relative to either pathway independently. Since isoprene is a volatile organic compound (VOC) whereas 1,3-PDO is separated from the fermentation broth, their coproduction process does not increase the complexity or cost for the separation from each other. Hence, the presented strategy will be especially useful for developing efficient biocatalysts for other biofuels and biochemicals, which are driven by cofactor concentrations.

Keywords

Coproduction Isoprene 1,3-Propanediol Cofactor balance Escherichia coli 

Notes

Acknowledgements

The authors appreciate the contribution of the Dr. Haibo Zhang for his advice on strain design. The authors also acknowledge Prof. Haiyan Yang for the assistance on the conduction of GC and HPLC detection.

Funding

This work was supported by Natural Science Foundation of China (No. 21572242), and Taishan Scholars Climbing Program of Shandong (No. tspd20150210).

Compliance with ethical standards

Competing interests

The authors declare that they have no competing interests.

Ethics approval and consent to participate

Not required.

Supplementary material

253_2018_9578_MOESM1_ESM.pdf (169 kb)
ESM 1 (PDF 168 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdaoChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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