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Interleaflet coupling of n-alkane incorporated bilayers.

Hatsuho Usuda1, Mafumi Hishida, Elizabeth G Kelley

  • 1Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan. kazuya@chem.tsukuba.ac.jp.

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Summary
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Adding n-alkanes to lipid bilayers affects their mechanical properties. Longer n-alkanes decrease interleaflet coupling, softening the membrane and altering its structure.

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Area of Science:

  • Biophysics
  • Materials Science
  • Physical Chemistry

Background:

  • The mechanical properties of lipid bilayers, such as bending modulus (κ) and compressibility modulus (KA), are crucial for membrane function.
  • These moduli are influenced by the coupling between the bilayer's leaflets.

Purpose of the Study:

  • To investigate how n-alkanes affect the interleaflet coupling and elastic moduli of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) bilayers.
  • To correlate changes in membrane dynamics and structure with n-alkane incorporation.

Main Methods:

  • Neutron spin echo (NSE) spectroscopy to measure membrane thickness fluctuations and infer elastic moduli.
  • Small-angle X-ray and neutron scattering (SAXS and SANS) to determine bilayer structure and n-alkane distribution.

Main Results:

  • Increasing n-alkane length increased DPPC bilayer thickness.
  • NSE indicated that longer n-alkanes softened the bilayers.
  • SAXS/SANS revealed that longer n-alkanes concentrated at the bilayer center, reducing interleaflet coupling.

Conclusions:

  • The observed changes in elastic moduli are attributed to decreased interleaflet coupling induced by n-alkanes.
  • N-alkane distribution, particularly their concentration at the bilayer center, explains the reduced physical interaction between leaflets.
  • A comprehensive correlation between mesoscopic dynamics and microscopic structure was established using NSE and SANS.