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arXiv 2102.12925physics.bio-ph
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蛋白质-多肽解结合的内在动力学

Intrinsic Dynamics of Protein-Peptide Unbinding

Brankica Jankovic, Olga Bozovic, Peter Hamm

摘要:

研究了RNase S系统的变体的肽-蛋白质结合和解结合的动力学。为了启动该过程,光可切换偶氮苯部分已共价连接到S-肽,从而切换其对S-蛋白的结合亲和力。瞬态荧光猝灭的测量与时间分辨荧光计的帮助下,这是专门为这些实验设计的,是基于廉价的LED和激光二极管。一个突变体显示开-关行为,在光开关的一个状态中没有检测到特异性结合。与RNase S系统的其他变体相比,解结合至少快两个数量级。它的结论是,在这种情况下,解约束力基本上是无障碍的,揭示了内在的动态解约束力的事件,它发生在几个100微秒的时间尺度上的强烈拉伸指数的方式。

英文摘要:

The dynamics of peptide-protein binding and unbinding of a variant of the RNase S system has been investigated. To initiate the process, a photoswitchable azobenzene moiety has been covalently linked to the S-peptide, thereby switching its binding affinity to the S-protein. Transient fluorescence quenching was measured with the help of a time-resolved fluorometer, which has been specifically designed for these experiments and is based on inexpensive LED's and laser diodes only. One mutant shows on-off behaviour with no specific binding detectable in one of the states of the photoswitch. Unbinding is faster by at least two orders of magnitudes, as compared to other variants of the RNase S system. It is concluded that unbinding is essentially barrier-less in that case, revealing the intrinsic dynamics of the unbinding event, which occurs on a few 100 microseconds timescale in a strongly stretched-exponential manner.

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