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Related Experiment Videos

Interbilayer interactions between sphingomyelin and sphingomyelin/cholesterol bilayers.

T J McIntosh1, S A Simon, D Needham

  • 1Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710.

Biochemistry
|February 25, 1992
PubMed
Summary
This summary is machine-generated.

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Sphingomyelin bilayers exhibit repulsive hydration pressure, influenced by head group spacing and electric fields. Cholesterol addition increases this pressure and dipole potential, suggesting steric hindrance at close separations.

Area of Science:

  • Biophysics
  • Materials Science
  • Physical Chemistry

Background:

  • Sphingomyelin and cholesterol are key components of cell membranes.
  • Understanding lipid bilayer interactions is crucial for membrane biophysics.
  • Previous studies focused on phosphatidylcholine bilayers.

Purpose of the Study:

  • To investigate pressure-fluid spacing relations in sphingomyelin bilayers.
  • To determine the effect of cholesterol on sphingomyelin bilayer properties.
  • To elucidate the factors governing hydration pressure and dipole potential.

Main Methods:

  • X-ray diffraction analysis of osmotically stressed aqueous dispersions and oriented multilayers.
  • Measurement of repulsive hydration pressure and fluid spacing.

Related Experiment Videos

  • Determination of dipole potential (V) for monolayers in equilibrium with liposomes.

    • Main Results:

    • Repulsive hydration pressure decays exponentially with increasing fluid spacing (5-20 A).
    • Decay length (lambda) is ~2 A for sphingomyelin, similar to phosphatidylcholine.
    • Sphingomyelin bilayers show smaller hydration pressure and dipole potential than phosphatidylcholine.
    • Equimolar cholesterol increases hydration pressure and dipole potential in sphingomyelin bilayers.
    • A sharp increase in pressure at ~5 A interbilayer spacing indicates steric hindrance.

    Conclusions:

    • Hydration pressure magnitude correlates with the electric field at the interface (V/lambda)^2.
    • Cholesterol modulates sphingomyelin bilayer properties, enhancing hydration pressure and dipole potential.
    • Steric hindrance becomes significant at small interbilayer spacings for sphingomyelin bilayers.