Abstract
1-Butanol has been utilized widely in industry and can be produced or transformed by microbes. However, current knowledge about the mechanisms of 1-butanol tolerance in bacteria remains quite limited. Here, we applied untargeted metabolomics to study Bacillus subtilis cells under 1-butanol stress and identified 55 and 37 ions with significantly increased and decreased levels, respectively. Using accurate mass determination, tandem mass spectra, and synthetic standards, 86 % of these ions were characterized. The levels of phosphatidylethanolamine, diglucosyldiacylglycerol, and phosphatidylserine were found to be upregulated upon 1-butanol treatment, whereas those of diacylglycerol and lysyl phosphatidylglycerol were downregulated. Most lipids contained 15:0/15:0, 16:0/15:0, and 17:0/15:0 acyl chains, and all were mapped to membrane lipid biosynthetic pathways. Subsequent two-stage quantitative real-time reverse transcriptase PCR analyses of genes in the two principal membrane lipid biosynthesis pathways revealed elevated levels of ywiE transcripts in the presence of 1-butanol and reduced expression levels of cdsA, pgsA, mprF, clsA, and yfnI transcripts. Thus, the gene transcript levels showed agreement with the metabolomics data. Lastly, the cell morphology was investigated by scanning electron microscopy, which indicated that cells became almost twofold longer after 1.4 % (v/v) 1-butanol stress for 12 h. Overall, the studies uncovered changes in the composition of glycerolipids and phospholipids in B. subtilis under 1-butanol stress, emphasizing the power of untargeted metabolomics in the discovery of new biological insights.
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Acknowledgments
We thank Sitthiporn Associates Co., Ltd. for providing us with the Waters Alliance e2695 high performance LC instrument; the Food Research and Testing Laboratory, Faculty of Science, Chulalongkorn University for access to the nitrogen concentrator; the Thai Government Stimulus Package 2 (TKK2555) for the financial support to acquire the Bruker MicrOTOF Q-II mass spectrometer; Poompat Aroonsri for his initial help with the project; and Dr. Robert Douglas John Butcher (Publication Counseling Unit, Chulalongkorn University) for his thorough checking of English usage and constructive comments in preparing this manuscript. This work was supported by the Thailand Research Fund (TRG5780194) and the Ratchadapisek Somphot Fund of Chulalongkorn University. The opinions expressed in this paper are the sole responsibility of the authors and do not necessarily reflect those of the Thailand Research Fund or Chulalongkorn University.
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Vinayavekhin, N., Mahipant, G., Vangnai, A.S. et al. Untargeted metabolomics analysis revealed changes in the composition of glycerolipids and phospholipids in Bacillus subtilis under 1-butanol stress. Appl Microbiol Biotechnol 99, 5971–5983 (2015). https://doi.org/10.1007/s00253-015-6692-0
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DOI: https://doi.org/10.1007/s00253-015-6692-0