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Shapes of bilayer vesicles with membrane embedded molecules
V Kralj-Iglic1, S Svetina, B Zeks
1Institute of Biophysics, Medical Faculty, University of Ljubljana, Slovenia.
European Biophysics Journal : EBJ
|January 1, 1996
Summary
Cell membrane shape and embedded molecule distribution are linked by membrane curvature. This coupling can lead to non-axisymmetric cell shapes, unlike in homogeneous membranes.
Area of Science:
- Biophysics
- Cell Biology
- Soft Matter Physics
Background:
- Integral membrane proteins influence cell shape.
- Cell shape is critical for biological function.
- Membrane curvature affects embedded molecule energy.
Purpose of the Study:
- Investigate the interdependence between lateral molecule distribution and cell shape.
- Model how membrane curvature influences embedded molecule energy and distribution.
- Determine equilibrium cell shapes and molecule distributions.
Main Methods:
- Developed a model coupling molecule distribution to membrane curvature.
- Derived expressions for free energy and molecule distribution functions.
- Minimized total membrane free energy (molecule and elastic energy).
Main Results:
- Proposed a model for molecule-curvature interaction.
- Derived equilibrium distributions and shapes.
- Demonstrated that inhomogeneous molecule distribution can induce non-axisymmetric cell shapes.
Conclusions:
- Lateral distribution of membrane-embedded molecules significantly impacts cell shape.
- Non-axisymmetric cell shapes are possible due to molecule-curvature coupling.
- This model provides insights into cell mechanics and membrane organization.