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首页> 外文期刊>ACS Omega >Mechanical Unfolding of Single Polyubiquitin Molecules Reveals Evidence of Dynamic Disorder
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Mechanical Unfolding of Single Polyubiquitin Molecules Reveals Evidence of Dynamic Disorder

机译：单个多泛素分子的机械展开揭示了动态障碍的证据

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Mechanical unfolding of single polyubiquitin molecules subjected to a constant stretching force showed nonexponentiality in the measured probability density of unfolding (waiting time distribution) and the survival probability of the folded state during the course of the measurements. These observations explored the relevance of disorder present in the system under study with implications for a static disorder approach to rationalize the experimental results. Here, an approach for dynamic disorder is presented based on Zwanzig’s fluctuating bottleneck (FB) model, in which the rate of the reaction is controlled by the passage through the cross-sectional area of the bottleneck. The radius of the latter undergoes stochastic fluctuations that in turn is described in terms of the end-to-end distance fluctuations of the Rouse-like dynamics using a non-Markovian generalized Langevin equation with a memory kernel and Gaussian colored noise. Our results are comprised of analytical expressions for the survival probability and waiting time distribution, which show excellent agreement with the experimental data throughout the range of the applied forces. In addition, by fitting the survival probabilities at different stretching forces, we quantify two system parameters, namely, the average free energy ΔG _(av) and the average distance to the transition state Δx _(av), both perfectly recovered the experimental estimates. These agreements validate the present model of polymer dynamics, which captures the very essence of dynamic disorder in single-molecule pulling experiments.
机译：在测量期间，在测量的概率密度和折叠状态的折叠状态的生存概率中，对恒定拉伸力进行的单个络合蛋白分子的机械展开显示在测量过程中的测量概率密度。这些观察结果探讨了在静态紊乱方法的研究中存在的系统中存在的疾病的相关性，以合理化实验结果。这里，基于Zwanzig的波动瓶颈（FB）模型来呈现动态障碍的方法，其中反应速率由通过瓶颈的横截面积的通道控制。后者的半径经历随机波动，其又通过使用具有存储器内核和高斯彩色噪声的非马洛维亚广义Langevin等式的崛起的动态的端到端距离波动来描述。我们的结果由用于生存概率和等待时间分布的分析表达式组成，其与在应用力范围内的实验数据显示出优异的一致性。另外，通过在不同的拉伸力下拟合生存概率，我们量化了两个系统参数，即平均自由能量δ

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