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Increased Microbial Butanol Tolerance by Exogenous Membrane Insertion Molecules.

Jamie Hinks1, Yaofeng Wang2, Artur Matysik3

  • 1Singapore Centre for Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, Singapore, 637551, Singapore. jhinks@ntu.edu.sg.

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A novel molecule, COE1-5C, enhances bacterial solvent tolerance by stabilizing cell membranes against butanol damage. This approach improves microbial growth rates for more efficient biofuel production.

Keywords:
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Area of Science:

  • Biotechnology
  • Microbiology
  • Biophysics

Background:

  • Butanol is a promising biofuel, but low production yields increase recovery costs.
  • Butanol-induced membrane fluidization limits microbial titers in bioprocesses.
  • Strategies to enhance microbial solvent tolerance are crucial for efficient biofuel production.

Purpose of the Study:

  • To investigate exogenous molecules for stabilizing microbial membranes against butanol.
  • To identify compounds that enhance bacterial tolerance to inhibitory butanol concentrations.
  • To understand the molecular mechanisms underlying butanol tolerance.

Main Methods:

  • In silico, in vitro, and in vivo techniques were employed.
  • Single-molecule tracking of lipid bilayers.
  • Microbial growth rate assays with E. coli K12.
  • Molecular dynamics simulations.

Main Results:

  • COE1-5C, a five-ringed conjugated oligoelectrolyte, significantly reduced phospholipid diffusion in lipid bilayers.
  • COE1-5C treatment enhanced the growth rate of E. coli K12 at inhibitory butanol levels.
  • Simulations indicated COE1-5C stabilizes bilayers by interacting with acyl chains, countering butanol-induced fluidization.

Conclusions:

  • Exogenous addition of COE1-5C confers butanol tolerance to bacteria.
  • This method complements genetic modification and expands microbial physiological ranges for bioprocessing.
  • Improved bilayer stability is linked to enhanced growth rates in butanol-tolerant microbes.