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Interaction between inclusions embedded in membranes
H Aranda-Espinoza1, A Berman, N Dan
1Instituto de Físcia, Universidad Autónoma de San Luis Potosi, Mexico. helim@sbphy.physics.ucsb.edu
Biophysical Journal
|August 1, 1996
Summary
Membrane properties influence how inclusions interact, with spacing affecting attraction/repulsion. Finite spontaneous curvature significantly alters these interactions, deviating from simple hard-core models.
Area of Science:
- Biophysics
- Soft Matter Physics
- Materials Science
Background:
- Membrane-bound inclusions can interact via deformations they induce in the lipid bilayer.
- Understanding these interactions is crucial for processes like cell signaling and membrane organization.
Purpose of the Study:
- To quantify the membrane-induced interaction between inclusions.
- To investigate the role of membrane properties (stretching/bending moduli, spontaneous curvature) and inclusion characteristics (radius, spacing) on this interaction.
Main Methods:
- Analytical calculations of membrane-induced forces based on elasticity theory.
- Application of Ornstein-Zernike theory with Percus-Yevick closure to determine the radial distribution function of inclusions.
Main Results:
- The interaction between inclusions is non-monotonic with spacing.
- The energy minimum's location depends on spontaneous curvature and membrane perturbation decay length (determined by moduli).
- Membrane perturbation energy scales with inclusion radius.
Conclusions:
- Membrane deformation mediates inclusion interactions, which are sensitive to spontaneous curvature.
- At zero spontaneous curvature, interactions resemble hard-core repulsion; finite spontaneous curvature leads to dramatically modified effective interactions.