Structures of radial spokes and associated complexes important for ciliary motility.

Structures of radial spokes and associated complexes important for ciliary motility.
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DOI:
10.1038/s41594-020-00530-0
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发表时间:
2021-01
影响因子:
16.8
通讯作者:
Brown A
Brown A
中科院分区:
生物学1区
文献类型:
--
作者:
Gui M;Ma M;Sze-Tu E;Wang X;Koh F;Zhong ED;Berger B;Davis JH;Dutcher SK;Zhang R;Brown A

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在运动纤毛中,一个机械调节网络负责将成千上万的动力蛋白马达的动作转换成一个单一的推进波形。在这里,我们使用两个互补的冷冻EM策略,以确定结构的主要mechanoregulators结合纤毛双微管在莱茵衣藻。我们确定孤立的径向辐条RS 1的结构,和微管结合RS 1,RS 2,和连接蛋白-动力蛋白调节复合物。从这些结构中,我们确定并建立原子模型的30种蛋白质,包括23个径向辐条亚基。我们揭示了机械调节复合物如何与具有96 nm周期性的双线微管对接并相互通信。此外,我们观察到RS 2和动力蛋白马达IDAc之间的直接和动态耦合关联,为机械信号控制马达活动提供了分子基础。这些结构推进了我们对机械调节在定义纤毛波形中的作用的理解。
In motile cilia, a mechanoregulatory network is responsible for converting the action of thousands of dynein motors bound to doublet microtubules into a single propulsive waveform. Here, we use two complementary cryo-EM strategies to determine structures of the major mechanoregulators that bind ciliary doublet microtubules in Chlamydomonas reinhardtii. We determine structures of isolated radial spoke RS1, and the microtubule-bound RS1, RS2, and the nexin-dynein regulatory complex. From these structures, we identify and build atomic models for 30 proteins including 23 radial-spoke subunits. We reveal how mechanoregulatory complexes dock to doublet microtubules with regular 96-nm periodicity and communicate with one another. Additionally, we observe a direct and dynamically coupled association between RS2 and the dynein motor IDAc, providing a molecular basis for the control of motor activity by mechanical signals. These structures advance our understanding of the role of mechanoregulation in defining the ciliary waveform.
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