Lis1 relieves cytoplasmic dynein-1 autoinhibition by acting as a molecular wedge.

Lis1 relieves cytoplasmic dynein-1 autoinhibition by acting as a molecular wedge.
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DOI:
10.1038/s41594-023-01069-6
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发表时间:
2023-09
影响因子:
16.8
通讯作者:
Leschziner, Andres E.
Leschziner, Andres E.
中科院分区:
生物学1区
文献类型:
--
作者:
Karasmanis, Eva P.;Reimer, Janice M.;Kendrick, Agnieszka A.;Nguyen, Kendrick H. V.;Rodriguez, Jennifer A.;Truong, Joey B.;Lahiri, Indrajit;Reck-Peterson, Samara L.;Leschziner, Andres E.

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细胞质动力蛋白-1 将细胞内货物转运至微管负端。动力蛋白具有自身抑制性,并经历构象变化,形成活性复合物,该复合物由一个或两个动力蛋白二聚体、动力蛋白复合物和激活接头组成。无脑畸形 1 基因 LIS1 在基因上与从真菌到哺乳动物的动力蛋白通路相关,并且在患有神经发育疾病无脑畸形的人中发生突变。 Lis1 是活性动力蛋白复合物形成所必需的,但其如何实现这一点尚不清楚。在这里,我们提出了两个酵母动力蛋白运动域的结构,其间有两个 Lis1 二聚体。该结构中动力蛋白和 Lis1 之间的接触位点称为“Chi”,是 Lis1 在酿酒酵母体内调节动力蛋白以及在体外形成活性人动力蛋白-动力蛋白-激活接头复合物所必需的。我们认为该结构代表了动力蛋白激活途径的中间体,揭示了 Lis1 如何缓解动力蛋白的自身抑制状态。 Karasmanis、Reimer 和 Kendrick 等人使用冷冻电镜。揭示了一种 Lis1 介导的动力蛋白二聚体,称为 Chi,它作为缓解动力蛋白自身抑制的中间状态。
Cytoplasmic dynein-1 transports intracellular cargo towards microtubule minus ends. Dynein is autoinhibited and undergoes conformational changes to form an active complex that consists of one or two dynein dimers, the dynactin complex, and activating adapter(s). The Lissencephaly 1 gene, LIS1, is genetically linked to the dynein pathway from fungi to mammals and is mutated in people with the neurodevelopmental disease lissencephaly. Lis1 is required for active dynein complexes to form, but how it enables this is unclear. Here, we present a structure of two yeast dynein motor domains with two Lis1 dimers wedged in-between. The contact sites between dynein and Lis1 in this structure, termed ‘Chi,’ are required for Lis1’s regulation of dynein in Saccharomyces cerevisiae in vivo and the formation of active human dynein–dynactin–activating adapter complexes in vitro. We propose that this structure represents an intermediate in dynein’s activation pathway, revealing how Lis1 relieves dynein’s autoinhibited state. Using cryo-EM, Karasmanis, Reimer, and Kendrick et al. reveal a Lis1-mediated dynein dimer, termed Chi, that serves as intermediate state in relieving dynein’s autoinhibition.
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