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:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Voth GA
Voth GA
中科院分区:
其他
文献类型:
--
作者:
Izvekov S;Voth GA

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在我们以前的工作中开发的多尺度粗粒化(MS-CG)方法在这里扩展到无溶剂脂质双层模型。水(溶剂)分子完全整合出粗粒(CG)有效力场。MS-CG力场是成对中心力的总和,精确地近似了粗粒度坐标系中平均力的多体势。因此,它包含了能量和熵的贡献。为了改善MS-CG模拟双层的稳定性和弹性性质,采用了额外的约束:与CG双层位点相关联的部分维里与其对应的原子值相匹配。由此产生的无溶剂MS-CG模型再现了具有准确的结构和弹性特性的液态脂质双层。最后,无溶剂的MS-CG模型被用来模拟一个非常大的,平坦的双层和两个脂质体的几何形状,证明其大大提高了计算效率。
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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