Clusters of lysozyme in aqueous solutions

Clusters of lysozyme in aqueous solutions
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水溶液中的溶菌酶簇

DOI:
10.1103/physreve.98.032419
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发表时间:
2018
期刊:
影响因子:
2.4
通讯作者:
Cai, W.
Cai, W.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Baumketner, A.;Cai, W.

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蛋白质溶菌酶的平衡簇是正在进行的科学辩论的中心。先前试图提供与所有实验证据一致的星团的微观描述并没有完全成功。主要原因是使用了具有预定义形状的模型势。本文直接从实验结构因子推导出无模型蛋白间电位。导出的势是全局排斥的,但在短距离处有局部最小值。最小值对于结构因子随蛋白质浓度的正确行为是必不可少的,特别是在短波矢量上的特征最大值的移位模式。平衡簇在整个浓度范围内都可以观察到,但它们的性质在低浓度和高浓度限值上有所不同。在低浓度下,团簇在形状上延伸。随着浓度的增加,小的团簇坍塌,而大的团簇由小的团簇聚集而成。在高浓度时,流体动力相互作用会导致动力学减速,在这种情况下,可以观察到向特定尺寸的永久簇状流体的转变。与现有的实验数据很好地一致,我们的模拟揭示了蛋白质簇的微观性质。
Equilibrium clusters of protein lysozyme are at the center of an ongoing scientific debate. Previous attempts to provide a microscopic description of the clusters that is consistent with all experimental evidence have not been fully successful. The primary reason is the use of model potentials that have a predefined shape. In this paper we derive a model-free interprotein potential directly from experimental structure factor. The derived potential is globally repulsive but has a local minimum at short distances. The minimum is essential for the correct behavior of the structure factor with protein concentration, in particular the shifting pattern of the signature maximum at short wave vectors. Equilibrium clusters are observed throughout the entire range of concentrations, but their nature differs in the low and high concentration limits. At low concentrations, the clusters are extended in shape. As the concentration is increased, small clusters collapse while large clusters are assembled from the small ones. Hydrodynamic interactions drive a kinetic slowdown at high concentrations, where a transition into a fluid of permanent clusters of specific size is observed. In good agreement with the available experimental data, our simulations shed light on the microscopic nature of protein clusters.
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影响因子: 11.1
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DOI: --
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影响因子: --
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发表时间: 2007-01-01
影响因子: 3.4
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