Cryo-EM structure of the autoinhibited state of myosin-2.

Cryo-EM structure of the autoinhibited state of myosin-2.
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肌球蛋白 2 自抑制状态的冷冻电镜结构。

DOI:
10.1126/sciadv.abk3273
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发表时间:
2021-12-24
期刊:
影响因子:
13.6
通讯作者:
Chinthalapudi K
Chinthalapudi K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Heissler SM;Arora AS;Billington N;Sellers JR;Chinthalapudi K

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10S 结构解释了肌球蛋白 2 的调节。我们使用单粒子冷冻电子显微镜解析了处于自抑制状态(10S)的平滑肌肌球蛋白-2 的近原子分辨率结构。 3.4-Å 结构揭示了 10S 的精确分子结构和 myosin-2 调节的结构基础。我们揭示了通过调节轻链磷酸化控制肌球蛋白自抑制和激活的磷酸化位点的位置。此外,我们在 myosin-2 中呈现了一种先前未识别的构象状态,该构象状态捕获了活性位点中 ATP 水解产生的 ADP 和 Pi。这种非规范状态代表了肌球蛋白酶循环的一个分支,并解释了 10S 酶功能的自身抑制及其对肌动蛋白亲和力的降低。我们的结构共同定义了通过调节轻链磷酸化驱动 10S 形成、稳定和缓解的分子机制。
10S structure explains myosin-2 regulation. We solved the near-atomic resolution structure of smooth muscle myosin-2 in the autoinhibited state (10S) using single-particle cryo–electron microscopy. The 3.4-Å structure reveals the precise molecular architecture of 10S and the structural basis for myosin-2 regulation. We reveal the position of the phosphorylation sites that control myosin autoinhibition and activation by phosphorylation of the regulatory light chain. Further, we present a previously unidentified conformational state in myosin-2 that traps ADP and Pi produced by the hydrolysis of ATP in the active site. This noncanonical state represents a branch of the myosin enzyme cycle and explains the autoinhibition of the enzyme function of 10S along with its reduced affinity for actin. Together, our structure defines the molecular mechanisms that drive 10S formation, stabilization, and relief by phosphorylation of the regulatory light chain.
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