Microtubule-binding core of the tau protein.

Microtubule-binding core of the tau protein.
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tau蛋白的微管结合核心。

DOI:
10.1126/sciadv.abo4459
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发表时间:
2022-07-22
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
文献类型:
--
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tau蛋白与微管结合以维持神经元健康。tau蛋白的翻译后修饰干扰这种结合,导致神经退行性疾病中的tau蛋白聚集。在这里,我们使用固态核磁共振(NMR)来研究tau微管结合结构域的结构。研究了含有四个微管结合重复序列和一个假重复序列R′的野生型tau蛋白。与紫杉醇稳定的微管复合,固定化的残基表现出良好的分辨率的二维光谱,可以分配到R4的氨基末端区域和R′结构域。当tau蛋白与微管蛋白共组装形成不稳定的微管时,R′信号保留,而R4信号消失,表明R′保持固定,而R4变得更加移动的。因此,R′在竞争中胜过其他四个重复序列与微管结合。这些NMR数据,连同先前的冷冻电子显微镜密度,表明微管结合的R′的扩展构象。在所有重复序列中,R′含有最多的带电残基,这表明电荷-电荷相互作用驱动tau-微管缔合。固态NMR数据显示,全长tau蛋白通过假重复序列结合微管,而富含脯氨酸的结构域是移动的。
The protein tau associates with microtubules to maintain neuronal health. Posttranslational modifications of tau interfere with this binding, leading to tau aggregation in neurodegenerative disorders. Here, we use solid-state nuclear magnetic resonance (NMR) to investigate the structure of the microtubule-binding domain of tau. Wild-type tau that contains four microtubule-binding repeats and a pseudorepeat R′ is studied. Complexed with taxol-stabilized microtubules, the immobilized residues exhibit well-resolved two-dimensional spectra that can be assigned to the amino-terminal region of R4 and the R′ domain. When tau coassembles with tubulin to form unstable microtubules, the R′ signals remain, whereas the R4 signals disappear, indicating that R′ remains immobilized, whereas R4 becomes more mobile. Therefore, R′ outcompetes the other four repeats to associate with microtubules. These NMR data, together with previous cryo–electron microscopy densities, indicate an extended conformation for microtubule-bound R′. R′ contains the largest number of charged residues among all repeats, suggesting that charge-charge interaction drives tau-microtubule association. Solid-state NMR data show that full-length tau binds microtubules through a pseudorepeat, whereas a proline-rich domain is mobile.
DOI: 10.1083/jcb.107.4.1449
发表时间: 1988-10
期刊: The Journal of cell biology
影响因子: --
作者:
Hirokawa N;Shiomura Y;Okabe S
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