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arXiv 0910.5340cond-mat.softcond-mat.stat-mech
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蛋白质溶液模型中折叠与聚集的竞争

Competition between folding and aggregation in a model for protein solutions

Moumita Maiti, Madan Rao, Srikanth Sastry

摘要:

我们使用一个唯象模型研究了单个蛋白质折叠和蛋白质-蛋白质聚集之间竞争的热力学和动力学结果,其中蛋白质可以处于未折叠(U)、错误折叠(M)或折叠(F)状态。该相图显示了溶液中具有错误折叠蛋白质聚集体的相和分离的蛋白质(U或F)的相之间的共存。在低蛋白质浓度下的旋节线显示出非单调的行为与温度,与在低温下的折叠蛋白质的溶液的稳定性的影响。我们遵循的动力学“淬火”从U-相(冷却)或F-相(加热)的亚稳或不稳定的相图的一部分,导致聚集。我们描述了如何有趣的后果聚集体大小的分布,和增长动力学产生的折叠和聚集之间的竞争。

英文摘要:

We study the thermodynamic and kinetic consequences of the competition between single-protein folding and protein-protein aggregation using a phenomenological model, in which the proteins can be in the unfolded (U), misfolded (M) or folded (F) states. The phase diagram shows the coexistence between a phase with aggregates of misfolded proteins and a phase of isolated proteins (U or F) in solution. The spinodal at low protein concentrations shows non-monotonic behavior with temperature, with implications for the stability of solutions of folded proteins at low temperatures. We follow the dynamics upon "quenching" from the U-phase (cooling) or the F-phase (heating) to the metastable or unstable part of the phase diagram that results in aggregation. We describe how interesting consequences to the distribution of aggregate size, and growth kinetics arise from the competition between folding and aggregation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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