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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
Published on: July 22, 2015
High pressure effect on phase transition behavior of lipid bilayers
Kan Lai1, Biao Wang, Yong Zhang
1State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou, China.
Physical Chemistry Chemical Physics : PCCP
|March 16, 2012
Summary
High pressure significantly shifts the phase transition temperature of dipalmitoylphosphatidylcholine bilayers. This transition is critically dependent on lipid area, with implications for understanding biological membrane behavior under pressure.
Area of Science:
- Biophysics
- Computational Biology
- Materials Science
Background:
- Lipid bilayer phase behavior is crucial for cellular functions.
- Understanding how external factors like pressure influence membrane structure is vital.
Purpose of the Study:
- To investigate the phase behavior of dipalmitoylphosphatidylcholine bilayers under high pressure.
- To characterize the critical lipid area and pressure sensitivity of lipid bilayers.
Main Methods:
- Coarse-grained molecular dynamic simulations were employed.
- Bilayer patches were simulated under varying high-pressure conditions.
- Phase transitions were induced by cooling simulated bilayer patches.
Main Results:
- The phase transition temperature of dipalmitoylphosphatidylcholine bilayers increases by 37 °C kbar(-1) with rising pressure, consistent with experimental findings.
- A critical lipid area of approximately 0.57 nm(2) was identified at the main phase transition boundary.
- Acyl chain structure dictates similar pressure sensitivities in phase transition temperatures across different lipids.
- High pressure maintains bilayer thickness and acyl chain interdigitation, unlike high temperature effects.
Conclusions:
- High pressure significantly alters lipid bilayer phase transitions, with a notable shift in transition temperature.
- Lipid area is a critical determinant of the main phase transition under pressure.
- Simulations provide insights into the distinct structural effects of high pressure versus high temperature on lipid bilayers.
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