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Odor Discrimination by Lipid Membranes.

Troy W Lowry1, Aubrey E Kusi-Appiah1, Debra Ann Fadool1

  • 1Department of Biological Science, Florida State University, Tallahassee, FL 32306, USA.

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|February 25, 2023
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Summary
This summary is machine-generated.

This study shows that lipid membranes can discriminate between different odors. Model membrane systems demonstrated sensitivity to odorants, suggesting a role for membranes in molecular recognition.

Keywords:
biosensordropletenantioselectivitylipidlithographymicroarraynanointaglionoseodorant

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Area of Science:

  • Biophysics
  • Chemical Senses
  • Materials Science

Background:

  • Odor detection in mammals relies on G-protein-coupled receptors (GPCRs).
  • The potential role of lipid membranes in odor discrimination remains largely unexplored.
  • Investigating the physical properties of membranes in relation to olfactory processes is crucial.

Purpose of the Study:

  • To test the hypothesis that phospholipid bilayer membranes possess odor discrimination capabilities.
  • To investigate the interaction of specific odorants (S-carvone, R-carvone, racemic lilial) with model membrane systems.
  • To explore the sensitivity of lipid micro- and nanostructures to odorant exposure.

Main Methods:

  • Utilized model membrane systems, including supported lipid bilayers and multilayer microarrays.
  • Measured changes in membrane fluidity using fluorescence recovery after photobleaching (FRAP).
  • Employed an artificial nose assay with lipid multilayer diffraction gratings to assess odorant differentiation.

Main Results:

  • Odorants significantly altered the fluidity of supported lipid bilayers.
  • Lipid multilayer micro- and nanostructures exhibited high sensitivity to odorant exposure.
  • Lipid multilayer droplets and diffraction gratings successfully distinguished between S-carvone and R-carvone, outperforming ethanol controls.

Conclusions:

  • Phospholipid bilayer membranes demonstrate an inherent capacity for odor discrimination.
  • The physical properties of lipid membranes are sensitive to odorant interactions.
  • These findings suggest a significant role for lipid membranes in molecular recognition beyond GPCRs.