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Related Experiment Videos

Phospholipid interactions in model membrane systems. II. Theory.

D Stigter1, J Mingins, K A Dill

  • 1Department of Pharmaceutical Chemistry, University of California, San Francisco 94143.

Biophysical Journal
|June 1, 1992
PubMed
Summary

Statistical thermodynamic theory explains phospholipid head group interactions in lipid bilayers. The model accurately predicts interactions at higher densities, incorporating attractions and dipole fluctuations for enhanced accuracy.

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Area of Science:

  • Physical Chemistry
  • Biophysics
  • Thermodynamics

Background:

  • Phospholipid head group interactions influence membrane properties.
  • Previous models explained low-density interactions based on steric repulsion and dipole tilting.
  • Temperature dependence of interactions varied between phosphatidylcholine (PC) and phosphatidylethanolamine (PE).

Purpose of the Study:

  • To develop a statistical thermodynamic theory for phospholipid lateral interactions at higher surface densities.
  • To generalize existing theories to include dipole effects and third virial coefficients.
  • To account for short-range attractions and fluctuating dipoles in phospholipid interactions.

Main Methods:

  • Generalization of the Hill interfacial virial expansion.

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  • Inclusion of dipole interactions and the third virial term.
  • Monte Carlo integration to compute fluctuating head group dipoles.

    • Main Results:

    • The theory successfully explains second and third virial coefficients for PC and PE lipids.
    • Short-range lateral attractions are necessary to account for large third virial coefficients.
    • Correlated dipole fluctuations mean average triplet interactions differ from summed pair potentials.

    Conclusions:

    • The extended head-group model accurately describes phospholipid interactions up to semiconcentrated monolayers.
    • The theory provides a more comprehensive understanding of lipid membrane behavior.
    • Findings are consistent with surface potential data from preceding studies.