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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Dynamical transition and proteinquake in photoactive yellow protein
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Dynamical transition and proteinquake in photoactive yellow protein

机译:光敏黄色蛋白的动态转变和蛋白地震

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摘要

Conformational dynamics in protein functioning covers a wide range of time scales from nanosecond fluctuations around a conformation to the large-amplitude conformational changes of milliseconds or longer. We illustrate a picture of cooperative coupling among such motions of different time scales in a model protein, photoactive yellow protein, by proposing a model that can consistently explain the experimental results on the photocycle of photoactive yellow protein. The model provides a scenario in which the global collective motion induced by the unfolding of the N-terminal domain promotes the loosening of the atomistic packing around the chromophore, which produces the favorable molecular environment for the photoexcited chromophore, thereby stabilizing the partially unfolded intermediate in the photocycle. The proteinquake, the large conformational change triggered by the local structural disturbance, plays a decisive role in controlling the kinetics of functioning.
机译:蛋白质功能的构象动力学涵盖了从标度周围的纳秒波动到毫秒或更长时间的大幅度构象变化的宽泛时间范围。我们通过提出一个可以一致地解释光敏黄色蛋白光循环实验结果的模型,来说明模型蛋白光敏黄色蛋白中不同时间尺度的这种运动之间的协同偶联作用。该模型提供了一种方案,其中由N端结构域的展开引起的全局集体运动会促进发色团周围的原子堆积的松动,从而为光激发发色团产生有利的分子环境,从而稳定了部分展开的中间体。照片周期。蛋白质地震是由局部结构扰动触发的大构象变化,在控制功能动力学中起决定性作用。

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