Protein aggregation: kinetics versus thermodynamics.

Protein aggregation: kinetics versus thermodynamics.
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蛋白质聚集:动力学与热力学。

DOI:
10.1021/jp302797c
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发表时间:
2012
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
S. Auer
S. Auer
中科院分区:
--
文献类型:
--
作者:
Piero Ricchiuto;A. Brukhno;S. Auer

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在这项研究中,我们解决了以下问题:动力学在蛋白质聚集中有多重要,以及导致这种行为的蛋白质的内在属性是什么。在我们最近对自然折叠的α-螺旋和β-折叠形成肽的平衡相图进行定量计算的基础上,我们进行了分子动力学模拟,以证明聚集机制和最终产物如何依赖于相图中的温度、浓度和起点。结果表明,热力学预测的聚集体结构与动力学得到的聚集体结构有很大差异。观察到的差异有助于合理地提出以下观点,即天然功能结构中的单体蛋白质相对于淀粉样蛋白状态可能是亚稳定的,并且天然折叠是保护它们免受聚集的特殊性质。
In this study, we address the questions of how important is the kinetics in protein aggregation, and what are the intrinsic properties of proteins that cause this behavior. On the basis of our recent quantitative calculation of the equilibrium phase diagram of natively folded α-helical and β-sheet forming peptides, we perform molecular dynamics simulations to demonstrate how the aggregation mechanism and end product depend on the temperature, concentration, and starting point in the phase diagram. The results obtained show that there are severe differences between the thermodynamically predicted and the kinetically obtained aggregate structures. The observed differences help to rationalize the suggestion that monomeric proteins in their native functional structure can be metastable with respect to the amyloid state, and that the native fold is a special property that protects them from aggregation.
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