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arXiv 0811.0664cond-mat.stat-mech
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蛋白质折叠动力学与冷变性

Folding Kinetics of Proteins and Cold Denaturation

Olivier Collet

摘要:

研究了蛋白质晶格模型的折叠动力学。它使用随机能量模型的链内耦合和温度依赖的自由能的溶剂化来自一个现实的非极性溶质的水合模型。折叠时间的计算使用蒙特卡罗模拟的区域中的相图中的链出现在天然结构。对于大范围的溶剂质量,这些折叠时间对于冷变性温度和温变性温度大致相等。在这些温度之间,折叠时间达到最大值,因此,在低温下,链的动力学总是随着温度的降低而加速。构象空间作为温度的函数的研究允许阐明这一现象。在低温下,随着温度的降低,体系的激活势垒降低的速度比温度的降低速度快。在高温下,势垒随温度的变化率随着温度的升高而降低,因为势垒的高度几乎是恒定的。

英文摘要:

Folding kinetics of a lattice model of protein is studied. It uses the Random Energy Model for the intrachain couplings and a temperature dependent free energy of solvation derived from a realistic hydration model of apolar solutes. The folding times are computed using Monte Carlo simulations in the region of the phase diagram where the chain occurs in the native structure. These folding times are roughly equals for the temperatures of cold and warm denaturation for a large range of solvent quality. Between these temperatures, the folding times reach maxima and thus, at low temperatures, the kinetics of the chain always speeds up as the temperature is decreased. The study of the conformational space as function of the temperature permits to elucidate this phenomenon. At low temperature, it shows that the activation barriers of the system decrease faster than the temperature as the temperature is decreased. At high temperature, the rate of the barriers over the temperature decreases as the temperature is increased because the height of the barrier is almost constant.

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