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Nonbilayer phases of membrane lipids
M W Tate1, E F Eikenberry, D C Turner
1Department of Physics, Princeton University, NJ 08544.
Chemistry and Physics of Lipids
|March 1, 1991
Summary
Liquid crystalline biomembranes can form non-lamellar phases due to lipid monolayer curvature. Understanding this phase stability, especially frustrated elastic stress near phase boundaries, is key to biomembrane function and lipid behavior.
Area of Science:
- Biophysics
- Materials Science
- Lipid Chemistry
Background:
- Liquid crystalline biomembrane lipids exhibit non-lamellar phases.
- These phases are characterized by curvature of lipid monolayers.
- Understanding phase stability requires analyzing bending energy and geometrical constraints.
Purpose of the Study:
- To analyze the energy of bending lipid monolayers.
- To understand interactions leading to bending energy.
- To investigate geometrical constraints causing competing energy terms.
Main Methods:
- Review of diffraction and other techniques for probing lipid phase structure.
- Application of a phenomenological model to explain lipid mesomorphic phase behavior.
Main Results:
- Lipid bilayer compositions near non-lamellar phase boundaries exhibit frustrated elastic stress.
- This stress may modulate the activity of imbedded membrane proteins.
- Provides a rationale for non-lamellar-tending lipids in biomembranes.
Conclusions:
- Frustrated elastic stress in lipid bilayers near phase boundaries is a significant factor.
- This stress has implications for membrane protein activity.
- Explains the prevalence of lipids that favor non-lamellar phases in biological membranes.