CryoET reveals actin filaments within platelet microtubules

CryoET reveals actin filaments within platelet microtubules
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CryoET 揭示血小板微管内的肌动蛋白丝

DOI:
10.1101/2023.11.24.568450
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发表时间:
2023
期刊:
--
影响因子:
--
通讯作者:
Tsuji C
Tsuji C
中科院分区:
--
文献类型:
--
作者:
Tsuji C

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肌动蛋白和微管细胞骨架之间的相互作用对许多细胞过程都很重要。最近的研究表明,微管和F-actin可以组装形成一个复合结构,其中F-actin占据微管内腔。这些细胞骨架杂种是否存在于生理环境中以及它们是如何形成的尚不清楚。在这里,我们表明,短交叉I类肌动蛋白丝以前确定的微管内的人类HAP 1细胞是cofilin结合的F-肌动蛋白。管腔F-肌动蛋白可以在体外重建,但cofilin不是必需的。此外,肌动蛋白丝与cofilin结合和规范的形态居住在人体血小板微管在生理条件下。我们建议,在电机驱动的微管成环和滑动过程中施加在微管网络上的应力可能有助于肌动蛋白掺入微管。
Crosstalk between the actin and microtubule cytoskeletons is important for many cellular processes. Recent studies have shown that microtubules and F-actin can assemble to form a composite structure where F-actin occupies the microtubule lumen. Whether these cytoskeletal hybrids exist in physiological settings and how they are formed is unclear. Here, we show that the short-crossover Class I actin filament previously identified inside microtubules in human HAP1 cells is cofilin-bound F-actin. Lumenal F-actin can be reconstituted in vitro, but cofilin is not essential. Moreover, actin filaments with both cofilin-bound and canonical morphologies reside within human platelet microtubules under physiological conditions. We propose that stress placed upon the microtubule network during motor-driven microtubule looping and sliding may facilitate the incorporation of actin into microtubules.
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