Tau co-organizes dynamic microtubule and actin networks.

Tau co-organizes dynamic microtubule and actin networks.
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DOI:
10.1038/srep09964
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发表时间:
2015-05-05
期刊:
影响因子:
4.6
通讯作者:
Arnal I
Arnal I
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Elie A;Prezel E;Guérin C;Denarier E;Ramirez-Rios S;Serre L;Andrieux A;Fourest-Lieuvin A;Blanchoin L;Arnal I

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微管和肌动蛋白之间的相互作用对细胞功能至关重要。然而,微管肌动蛋白组织的交联剂的机制仍然在很大程度上未被探索。在这里,我们报告说,tau蛋白,神经元微管相关蛋白,结合微管和肌动蛋白同时,促进在体外共同组织和耦合生长的两个网络。通过开发一个原始的分析,可视化伴随微管和肌动蛋白组装,我们表明,tau蛋白可以诱导引导聚合的肌动蛋白丝沿着微管轨道和生长的单个微管沿着肌动蛋白丝束。重要的是,tau介导微管-肌动蛋白共排列而不改变聚合物生长特性。突变研究进一步揭示了四个tau重复基序中的至少两个,主要被鉴定为微管蛋白结合位点,是连接微管和肌动蛋白所必需的。因此,Tau代表了微管和肌动蛋白网络之间的分子连接体,使两种细胞骨架能够协调,这在各种神经元环境中可能是必不可少的。
The crosstalk between microtubules and actin is essential for cellular functions. However, mechanisms underlying the microtubule-actin organization by cross-linkers remain largely unexplored. Here, we report that tau, a neuronal microtubule-associated protein, binds to microtubules and actin simultaneously, promoting in vitro co-organization and coupled growth of both networks. By developing an original assay to visualize concomitant microtubule and actin assembly, we show that tau can induce guided polymerization of actin filaments along microtubule tracks and growth of single microtubules along actin filament bundles. Importantly, tau mediates microtubule-actin co-alignment without changing polymer growth properties. Mutagenesis studies further reveal that at least two of the four tau repeated motifs, primarily identified as tubulin-binding sites, are required to connect microtubules and actin. Tau thus represents a molecular linker between microtubule and actin networks, enabling a coordination of the two cytoskeletons that might be essential in various neuronal contexts.
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