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首页> 外文期刊>International Journal of Quantum Chemistry >Molecular dynamics simulations of the Hras-GTP complex and the Hras-GDP complex
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Molecular dynamics simulations of the Hras-GTP complex and the Hras-GDP complex

机译:Hras-GTP复合物和Hras-GDP复合物的分子动力学模拟

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摘要

We study the structures of the Hras-GTP complex and the Hras-GDP complex in water to investigate the mechanism of GTP hydrolysis of the Hras-GTP complex. We performed molecular dynamics simulations of these complexes to investigate the structures of these complexes using the potential parameters of AMBER ff03 and our potential parameters around Mg2+. Our simulations show that the averaged structure differences between the Hras-GTP complex and Hras-GDP complex are found in the switch I and II regions. In particular, in the switch II region, the α2-helix of Hras-GDP is shorter than the α2-helix of Hras-GTP. The averaged number of water molecules in the first hydration sphere in Hras-GDP complex is larger than that in Hras-GTP complex. The occurrence ratio of the duration time of waters in the first hydration sphere of PA has long tail both in Hras-GTP and in Hras-GDP. In Hras-GDP complex, β-phosphate is hard to be hydrolyzed, while the number of waters in the first hydration sphere is larger than those in Hras-GTP. This suggests that there is a special direction for the hydrolysis.
机译:我们研究了Hras-GTP复合物和Hras-GDP复合物在水中的结构,以研究Gras水解Hras-GTP复合物的机理。我们使用AMBER ff03的势能参数和Mg2 +附近的势能参数对这些配合物进行了分子动力学模拟,以研究这些配合物的结构。我们的模拟结果表明,在I和II切换区域发现了Hras-GTP复合物和Hras-GDP复合物之间的平均结构差异。特别地,在开关II区域中,Hras-GDP的α2-螺旋比Hras-GTP的α2-螺旋短。 Hras-GDP复合物中第一个水化球中水分子的平均数量大于Hras-GTP复合物中的平均水分子数量。无论是Hras-GTP还是Hras-GDP,PA的第一个水合作用区中水持续时间的发生率都有长尾巴。在Hras-GDP复合物中,β-磷酸盐很难水解,而第一个水合层中的水的数量大于Hras-GTP中的水的数量。这表明水解有一个特殊的方向。

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