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首页> 外文期刊>Biochemistry >Tyrosine-Generated Nanostructures Initiate Amyloid Cross-Seeding in Proteins Leading to a Lethal Aggregation Trap
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Tyrosine-Generated Nanostructures Initiate Amyloid Cross-Seeding in Proteins Leading to a Lethal Aggregation Trap

机译:酪氨酸产生的纳米结构在导致致死聚集陷阱的蛋白质中引发淀粉样蛋白交叉播种

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摘要

Here, we show that aromatic amino acid tyrosine, under a physiologically mimicking condition, readily forms amyloid-like entities that can effectively drive aggregation of different globular proteins and aromatic residues. Tyrosine self assembly resulted in the formation of cross-beta rich regular fibrils as well as spheroidal oligomers. Computational data suggest intermolecular interaction between specifically oriented tyrosine molecules mediated through pi-pi stacking and H-bonding interactions, mimicking a cross-beta-like architecture. Both individual protein samples and mixed protein samples underwent aggregation in the presence of tyrosine fibrils, confirming the occurrence of amyloid cross-seeding. The surface of the tyrosine's amyloid like entities was predicted to trap native protein structures, preferably through hydrophobic and electrostatic interactions initiating an aggregation event. Because tyrosine is a precursor to vital neuromodulators, the inherent cross-seeding potential of the tyrosine fibrils may have direct relevance to amyloid-linked pathologies.
机译:在这里,我们表明芳族氨基酸酪氨酸在生理学上模拟条件下,容易形成淀粉样蛋白样实体,其能够有效地驱动不同球状蛋白和芳族残基的聚集。酪氨酸的自组装导致形成富含β富常规原纤维以及球形低聚物。计算数据提示通过PI-PI堆叠和H键合相互作用介导的特异定向酪氨酸分子之间的分子间相互作用,模仿跨β状架构。单独的蛋白质样品和混合蛋白质样品在酪氨酸原纤维存在下进行聚集,确认淀粉样蛋白交叉播种的发生。预计酪氨酸的淀粉样蛋白的表面,以捕获天然蛋白质结构,优选通过引发聚合事件的疏水和静电相互作用。因为酪氨酸是重要神经调节剂的前体,所以酪氨酸原纤维的固有跨播电势可能与淀粉样蛋白连接的病理有直接相关。

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  • 来源
    《Biochemistry》 |2018年第35期|共8页
  • 作者单位

    Jawaharlal Nehru Univ Sch Life Sci Biophys &

    Biomat Res Lab Room 310 New Delhi 110067 India;

    Jawaharlal Nehru Univ Sch Life Sci Biophys &

    Biomat Res Lab Room 310 New Delhi 110067 India;

    Jawaharlal Nehru Univ Sch Life Sci Biophys &

    Biomat Res Lab Room 310 New Delhi 110067 India;

    Jawaharlal Nehru Univ Sch Life Sci Biophys &

    Biomat Res Lab Room 310 New Delhi 110067 India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物化学;
  • 关键词

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