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首页> 外文期刊>Biochemistry >Comparison of Kinetics, Toxicity, Oligomer Formation, and Membrane Binding Capacity of alpha-Synuclein Familial Mutations at the A53 Site, Including the Newly Discovered A53V Mutation
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Comparison of Kinetics, Toxicity, Oligomer Formation, and Membrane Binding Capacity of alpha-Synuclein Familial Mutations at the A53 Site, Including the Newly Discovered A53V Mutation

机译:A53位点在A53位点的动力学,毒性,低聚物形成和膜结合能力的比较,包括新发现的A53V突变

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摘要

The involvement of alpha-synuclein (alpha-Syn) amyloid formation in Parkinson's disease (PD) pathogenesis is supported by the discovery of alpha-Syn gene (SNCA) mutations linked with familial PD, which are known to modulate the oligomerization and aggregation of a-Syn. Recently, the A53V mutation has been discovered, which leads to late-onset PD. In this study, we characterized for the first time the biophysical properties of AS3V, including the aggregation propensities, toxicity of aggregated species, and membrane binding capability, along with those of all familial mutations at the A53 position. Our data suggest that the AS3V mutation accelerates fibrillation of alpha-Syn without affecting the overall morphology or cytotoxicity of fibrils compared to those of the wild-type (WT) protein. The aggregation propensity for A.53 mutants is found to decrease in the following order: A53T AS3V WT A53E. In addition, a time course aggregation study reveals that the AS3V mutant promotes early oligomerization similar to the case for the AS3T mutation. It promotes the largest amount of oligomer formation immediately after dissolution, which is cytotoxic. Although in the presence of membrane mimicking environments, the A53V mutation showed an extent of helix induction capacity similar to that of the WT protein, it exhibited less binding to lipid vesicles. The nuclear magnetic resonance study revealed unique chemical shift perturbations caused by the AS3V mutation compared to those caused by other mutations at the A53 site. This study might help to establish the disease-causing mechanism of A53V in PD pathology.
机译:α-突触核蛋白(α-Syn)淀粉样蛋白形成在帕金森病(Pd)发病机制中的涉及通过发现与家族性Pd连接的α-syn基因(Snca)突变的发现支持,这已知是调节寡聚化和聚集的-syn。最近,已经发现了A53V突变,这导致晚期PD。在本研究中,我们首次表征了AS3V的生物物理性质,包括聚集的物种的聚集施力,毒性和膜结合能力以及A53位置的所有家族突变的毒性。我们的数据表明,与野生型(WT)蛋白相比,AS3V突变加速了Alpha-Syn的颤动而不会影响原纤维的整体形态或细胞毒性。发现A.53突变体的聚集倾向降低以下顺序:A53T> As3v& wt& A53E。此外,时间过程聚集研究表明,AS3V突变体促进与AS3T突变的情况相似的早期寡聚化。它在溶解后立即促进最大的低聚物形成,即细胞毒性。尽管在存在膜模拟环境中,A53V突变显示出与WT蛋白类似的螺旋感应能力的程度,其表现出与脂质囊泡的结合更少。核磁共振研究表明,与A53位点的其他突变引起的那些,由AS3V突变引起的独特化学换肤扰动。该研究可能有助于建立PD病理学中A53V的致病机制。

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  • 来源
    《Biochemistry》 |2018年第35期|共5页
  • 作者单位

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra India;

    Indian Inst Technol Dept Biosci &

    Bioengn Bombay 400076 Maharashtra 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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