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Multiscale coupling of mesoscopic- and atomistic-level lipid bilayer simulations
Rakwoo Chang1, Gary S Ayton, Gregory A Voth
1Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, Salt Lake City, 84112-0850, USA.
The Journal of Chemical Physics
|July 23, 2005
Summary
This study introduces a multiscale method to simulate large membrane systems by bridging atomistic and mesoscopic scales. The method accurately models membrane dynamics and size-dependent properties like lipid diffusion.
Area of Science:
- Computational biology
- Materials science
- Biophysics
Background:
- Simulating large biological membranes requires bridging atomistic and mesoscopic scales.
- Existing methods struggle to capture long-wavelength membrane dynamics.
Purpose of the Study:
- To develop and validate a general multiscale method for simulating membrane systems.
- To investigate the impact of membrane size on static and dynamic properties.
Main Methods:
- Parametrizing a mesoscopic elastic membrane model using atomistic molecular dynamics expansion modulus.
- Implementing a feedback mechanism from mesoscopic to atomistic scales via stress bridging.
- Simulating large membrane systems (approx. 100 nm) with explicit mesoscopic solvent.
Main Results:
- The multiscale model accurately reproduces static and dynamic undulation behaviors.
- Long-wavelength membrane modes (undulation, buckling) affect local tension response.
- Lipid self-diffusion and dipole rotational relaxation show strong dependence on membrane size.
Conclusions:
- The multiscale method effectively bridges atomistic and mesoscopic scales for membrane simulations.
- The model accurately captures size-dependent dynamic properties influenced by long-wavelength motions.
- This approach enables efficient simulation of large membrane systems and their complex behaviors.