Solid-state NMR of paired helical filaments formed by the core tau fragment tau(297-391)

Solid-state NMR of paired helical filaments formed by the core tau fragment tau(297-391)
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由核心 tau 片段 tau (297-391) 形成的成对螺旋丝的固态 NMR

DOI:
10.1101/2022.06.09.495520
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发表时间:
2022
期刊:
--
影响因子:
--
通讯作者:
Al-Hilaly Y
Al-Hilaly Y
中科院分区:
--
文献类型:
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作者:
Al-Hilaly Y

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Tau蛋白聚集成纤维状的交叉β聚集体是阿尔茨海默病(AD)和许多其他神经退行性疾病的标志。最近,患者来源的tau配对螺旋细丝(PHF)的几个核心结构已经被解决,揭示了一种结构变化,这种结构变化往往与特定的Tau病相关。为了进一步研究这些纤维核心的动力学特征,筛选菌株特异性小分子作为潜在的生物标志物和治疗药物,并开发菌株特异性抗体,需要重组tau丝的体外模型。我们最近发现,在没有常用于全长tau体外聚集的多阴离子辅助因子的情况下,一个由95个残基组成的tau片段(从297位到391位)被称为dGAE。结果表明,tau(297-391)是tau PHF的抗蛋白水解性核心,与冷冻电子显微镜所表征的结构重叠,是体外研究AD tau丝状结构的理想模型。在本研究中,我们用固体核磁共振对tau(297-391)纤维进行了表征,结果表明,在非还原条件下组装的tau(297-391)纤维比在还原剂DTT存在下组装的纤维更具动态性和更少的有序性。我们进一步报道了tau(297-391)+DTT纤维的共振归属,并与现有的tau核心结构进行了比较。
Aggregation of the tau protein into fibrillar cross-β aggregates is a hallmark of Alzheimer’s diseases (AD) and many other neurodegenerative tauopathies. Recently, several core structures of patient-derived tau paired helical filaments (PHFs) have been solved revealing a structural variability that often correlates with a specific tauopathy. To further characterize the dynamics of these fibril cores, to screen for strain-specific small molecules as potential biomarkers and therapeutics, and to develop strain-specific antibodies, recombinant in-vitro models of tau filaments are needed. We recently showed that a 95-residue fragment of tau (from residue 297 to 391), termed dGAE, forms filamentsin vitroin the absence of polyanionic co-factors often used forin vitroaggregation of full-length tau. Tau(297-391) was identified as the proteolytic resistant core of tau PHFs and overlaps with the structures characterized by cryo-electron microscopy inex vivoPHFs, making it a promising model for the study of AD tau filamentsin vitro. In the present study, we used solid-state NMR to characterize tau(297-391) filaments and show that such filaments assembled under non-reducing conditions are more dynamic and less ordered than those made in the presence of the reducing agent DTT. We further report the resonance assignment of tau(297-391)+DTT filaments and compare it to existing core structures of tau.
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