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Identification and manipulation of a novel locus to improve cell tolerance to short-chain alcohols in Escherichia coli

  • Yan Chen
  • Ying Wang
  • Tian-Hua Chen
  • Ming-Dong Yao
  • Wen-Hai Xiao
  • Bing-Zhi Li
  • Ying-Jin Yuan
Bioenergy/Biofuels/Biochemicals - Original Paper

Abstract

Escherichia coli KO11 is a popular ethanologenic strain, but is more sensitive to ethanol than other producers. Here, an ethanol-tolerant mutant EM was isolated from ultraviolet mutagenesis library of KO11. Comparative genomic analysis added by piecewise knockout strategy and complementation assay revealed EKO11_3023 (espA) within the 36.6-kb deletion from KO11 was the only locus responsible for ethanol sensitivity. Interestingly, when espA was deleted in strain W (the parent strain of KO11), ethanol tolerance was dramatically elevated to the level of espA-free hosts [e.g., MG1655 and BL21(DE3)]. And overexpression of espA in strains MG1655 and BL21(DE3) led to significantly enhanced ethanol sensitivity. In addition to ethanol, deletion of espA also improved cell tolerance to other short-chain (C2–C4) alcohols, including methanol, isopropanol, n-butanol, isobutanol and 2-butanol. Therefore, espA was responsible for short-chain alcohol sensitivity of W-strains compared to other cells, which provides a potential engineering target for alcohols production.

Keywords

Synthetic biology Cell tolerance Short-chain alcohols Escherichia coli espA 

Notes

Acknowledgements

This work was financially supported by the Ministry of Science and Technology of China (“973” Program, 2014CB745100), the National Natural Science Foundation of China (21621004, 21390203, 21622605 and 21576198) and Innovative Talents and Platform Program of Tianjin (16PTSYJC00050 and 16PTGCCX00140).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

Supplementary material

10295_2017_1996_MOESM1_ESM.docx (140 kb)
Supplementary material 1 (DOCX 140 kb)

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Copyright information

© Society for Industrial Microbiology and Biotechnology 2017

Authors and Affiliations

  • Yan Chen
    • 1
    • 2
  • Ying Wang
    • 1
    • 2
  • Tian-Hua Chen
    • 1
    • 2
  • Ming-Dong Yao
    • 1
    • 2
  • Wen-Hai Xiao
    • 1
    • 2
  • Bing-Zhi Li
    • 1
    • 2
  • Ying-Jin Yuan
    • 1
    • 2
  1. 1.Key Laboratory of Systems Bioengineering (Ministry of Education)Tianjin UniversityTianjinPeople’s Republic of China
  2. 2.SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and TechnologyTianjin UniversityTianjinPeople’s Republic of China

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