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Engineering Escherichia coli for efficient coproduction of polyhydroxyalkanoates and 5-aminolevulinic acid

  • Xue Zhang
  • Jian Zhang
  • Jiasheng Xu
  • Qian Zhao
  • Qian WangEmail author
  • Qingsheng Qi
Metabolic Engineering and Synthetic Biology - Original Paper

Abstract

Single-cell biorefineries are an interesting strategy for using different components of feedstock to produce multiple high-value biochemicals. In this study, a strategy was applied to refine glucose and fatty acid to produce 5-aminolevulinic acid (ALA) and polyhydroxyalkanoates (PHAs). To express the ALA and PHAs dual-production system efficiently and stably, multiple copies of the poly-β-3-hydroxybutyrate (PHB) synthesis operon were integrated into the chromosome of Escherichia coli DH5αΔpoxB. The above strain harboring the ALA C5 synthesis pathway genes hemA and hemL resulted in coproduction of 38.2% PHB (cell dry weight, CDW) and 3.2 g/L extracellular ALA. To explore coproduction of ALA and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), the PHBV synthetic pathway was also integrated into engineered E. coli and coexpressed with hemA and hemL; cells produced 38.9% PHBV (CDW) with 10.3 mol% 3HV fractions and 3.0 g/L ALA. The coproduction of ALA with PHB and PHBV can improve the utilization of carbon sources and maximize the value derived from the feedstock.

Keywords

5-Aminolevulinic acid Polyhydroxyalkanoates Escherichia coli Coproduction Single-cell biorefinery 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (31670047 and 31370085).

Compliance with ethical standards

Conflict of interest

The authors declare no financial or commercial conflict of interest.

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Copyright information

© Society for Industrial Microbiology and Biotechnology 2017

Authors and Affiliations

  • Xue Zhang
    • 1
  • Jian Zhang
    • 1
  • Jiasheng Xu
    • 1
  • Qian Zhao
    • 1
  • Qian Wang
    • 1
    Email author
  • Qingsheng Qi
    • 1
  1. 1.National Glycoengineering Research Center, State Key Laboratory of Microbial TechnologyShandong UniversityJinanPeople’s Republic of China

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