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Electrostatics of membrane adhesion.

S Marcelja1

  • 1Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT.

Biophysical Journal
|May 1, 1992
PubMed
Summary
This summary is machine-generated.

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Electrical double layer interactions shift from repulsive to attractive when divalent counterions are present, potentially driving membrane fusion. This finding is crucial for understanding cell adhesion mechanisms.

Area of Science:

  • Biophysics
  • Physical Chemistry
  • Surface Science

Background:

  • Electrical double layer interactions are critical in biological processes like membrane fusion.
  • The Poisson-Boltzmann approximation is typically used but fails with high ion concentrations.
  • Understanding forces during membrane fusion is essential for cell biology.

Purpose of the Study:

  • To investigate electrical double layer interactions during membrane fusion.
  • To determine the effect of divalent counterions on these interactions.
  • To explore the role of electrostatic forces in membrane adhesion.

Main Methods:

  • Utilized the anisotropic hypernetted chain (AHNC) method.
  • Studied ion-ion correlations beyond the Poisson-Boltzmann approximation.

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  • Considered conditions relevant to physiological membrane fusion.

    • Main Results:

    • Monovalent electrolytes result in repulsive forces, calculable by Poisson-Boltzmann.
    • Divalent counterions induce strong ion-ion correlations, invalidating Poisson-Boltzmann.
    • The presence of divalent counterions leads to attractive electrostatic forces.

    Conclusions:

    • Divalent counterions can reverse the double layer interaction from repulsive to attractive.
    • This electrostatic attraction may be a key factor in balancing forces during membrane adhesion.
    • The AHNC method provides a more accurate model for complex ionic environments.