Solvent-free lipid bilayer model using multiscale coarse-graining.
Solvent-free lipid bilayer model using multiscale coarse-graining.
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DOI:
10.1021/jp810440c
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发表时间:
2009-04-02
期刊:
影响因子:
--
通讯作者:
Voth GA
中科院分区:
文献类型:
--
作者:
Izvekov S;Voth GA
The multiscale coarse-graining (MS-CG) approach developed in our previous work is extended here to model solvent-free lipid bilayers. The water (solvent) molecules are completely integrated out of the coarse-grained (CG) effective force field. The MS-CG force field, a sum of pairwise central forces, accurately approximates the many-body potential of mean force in the coarse-grained coordinates. It thus incorporates both energetic and entropic contributions. To improve the stability and elastic properties of the MS-CG simulated bilayer, an additional constraint was adopted: the partial virial associated with CG bilayer sites was matched to its corresponding atomistic value for each configuration of the system. The resulting solvent-free MS-CG model reproduces a liquid-state lipid bilayer with accurate structural and elastic properties. Finally, the solvent-free MS-CG model is used to simulate a very large, flat bilayer and two liposome geometries, demonstrating its greatly enhanced computational efficiency.
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