A Proposed Mechanism for the Initial Myosin Binding Event on the Cardiac Thin Filament: A Metadynamics Study.

A Proposed Mechanism for the Initial Myosin Binding Event on the Cardiac Thin Filament: A Metadynamics Study.
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心脏细丝上肌球蛋白初始结合事件的机制:一项代谢动力学研究。

DOI:
10.1021/acs.jpclett.1c00223
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发表时间:
2021-04-15
期刊:
The journal of physical chemistry letters
影响因子:
--
通讯作者:
Schwartz SD
Schwartz SD
中科院分区:
其他
文献类型:
--
作者:
Baldo AP;Tardiff JC;Schwartz SD

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原肌球蛋白在丝状肌动蛋白上的运动通过阻断和揭示肌球蛋白结合位点来调节心肌粗细丝的跨桥周期。原肌球蛋白存在于三种不同的平衡状态,其中一种状态阻断肌球蛋白-肌动蛋白相互作用(阻断位置),其余两种允许弱(闭合位置)和强肌球蛋白结合(开放位置)。然而,实验信息阐明肌球蛋白如何绑定到细丝,并影响原肌球蛋白的肌动蛋白表面的过渡是缺乏的。使用metadaptics,我们模仿一个单一的肌球蛋白头部绑定的效果,通过确定所需的工作,拉小片段的原肌球蛋白在几个不同地区的细丝朝开放的位置。我们发现,由于心脏肌钙蛋白T的影响,所需工作的差异会导致优先结合位点,并确定进一步肌球蛋白头部募集的机制。
The movement of tropomyosin over filamentous actin regulates the cross-bridge cycle of the thick with thin filament of cardiac muscle by blocking and revealing myosin binding sites. Tropomyosin exists in three, distinct equilibrium states with one state blocking myosin-actin interactions (blocked position) and the remaining two allowing for weak (closed position) and strong myosin binding (open position). However, experimental information illuminating how myosin binds to the thin filament and influences tropomyosin’s transition across the actin surface is lacking. Using metadynamics, we mimic the effect of a single myosin head binding by determining the work required to pull small segments of tropomyosin toward the open position in several distinct regions of the thin filament. We find differences in required work due to the influence of cardiac troponin T lead to preferential binding sites and determine the mechanism of further myosin head recruitment.
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