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Applied Microbiology and Biotechnology

, Volume 102, Issue 21, pp 9279–9289 | Cite as

The effects of disruption in membrane lipid biosynthetic genes on 1-butanol tolerance of Bacillus subtilis

  • Nawaporn Vinayavekhin
  • Alisa S. Vangnai
Applied genetics and molecular biotechnology
  • 77 Downloads

Abstract

Microbes with enhanced 1-butanol tolerance have the potentials to be utilized in various biotechnological processes. To achieve the rational design of such strains, we previously conducted an untargeted metabolomics analysis of Bacillus subtilis under 1-butanol stress and uncovered a novel type of microbial responses as the alterations in the glycerolipid and phospholipid composition. However, the current knowledge about the relevance of these changes on 1-butanol tolerance remains quite limited. Here, we constructed the B. subtilis mutants with disruption in the pssA, ugtP (U), mprF (M), yfnI, and yfnI/mprF genes in the membrane lipid biosynthetic pathways. The 1-butanol tolerance test indicated markedly increased and decreased 1-butanol resistance in M and U compared to the wild-type strain, respectively, and slight effects in other strains under high stress level. Further examination of the lipid contents of these strains in the presence of 1-butanol by liquid chromatography–mass spectrometry demonstrated an elevated ratio of neutral and anionic to cationic lipids in direct relation with an improved 1-butanol tolerance. Last, cell morphological studies showed the shortening of only the U cells, compared to the wild-type. All strains including U were capable of elongating by 14–24% under 1-butanol stress. Together, the studies indicated the involvement of membrane lipid biosynthetic genes, which regulated glycerolipid and phospholipid composition, on 1-butanol tolerance and allowed for the procurement of M with enhanced 1-butanol tolerance trait, highlighting the usefulness of the overall approaches on discovery of novel biological insights and engineering of microorganisms with desired resistance characteristics.

Keywords

Bacillus subtilis 1-butanol tolerance Glycerolipids Phospholipids Membrane lipids Liquid chromatography–mass spectrometry 

Notes

Acknowledgments

We thank Dr. Andrew King (Department of Chemistry, Faculty of Science, Chulalongkorn University) for editorial help in preparing this manuscript, and Pensuphat Thongkachok for her initial help with the project.

Funding

This research was supported by the Asahi Glass Foundation, the Office of the Higher Education Commission, and the Thailand Research Fund (MRG6180002). The opinions expressed in this paper are the sole responsibility of the authors and do not necessarily reflect those of the funding agencies or Chulalongkorn University.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of ScienceChulalongkorn UniversityBangkokThailand
  2. 2.Department of Biochemistry, Faculty of ScienceChulalongkorn UniversityBangkokThailand
  3. 3.Biocatalyst and Environmental Biotechnology Research Unit, Faculty of ScienceChulalongkorn UniversityBangkokThailand
  4. 4.Center of Excellence on Hazardous Substance Management (HSM)Chulalongkorn UniversityBangkokThailand

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