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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining,...
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高度会导致脂质界面上垂直的α-synuclein构造.

Steven J Roeters1,2, Kris Strunge3, Kasper B Pedersen3

  • 1Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark. s.j.roeters@amsterdamumc.nl.

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概括

脂质膜影响与帕金森病相关的α-synuclein (αS) 聚合. 高度导致αS采用直立形状,促进相互作用和粉样蛋白形成.

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科学领域:

  • 生物物理学的生物物理.
  • 神经科学是一个神经科学.
  • 结构生物学 结构生物学

背景情况:

  • 阿尔法-同核素 (αS) 的氨基酸聚合与帕金森病有关.
  • 脂质膜可以催化αS聚合,但膜结合的αS的详细结构是未知的.

研究的目的:

  • 为了研究与离子脂质接口结合的单体αS的结构和方向.
  • 了解αS-脂质比如何影响结合和构成.

主要方法:

  • 接口特定的振动总频率生成 (VSFG) 实验.
  • 使用一种新的框架选择方法 ("ViscaSelect") 进行失衡分子动力学模拟.
  • 刺激性光谱计算,以比较模拟与实验数据.

主要成果:

  • 在低和生理性αS度下,αS采用平躺螺旋结构.
  • 在高的,可能与疾病相关的度下,αS转变为直立的,接口突出的形状.
  • 这种直立的构造促进了横向αS单体相互作用.

结论:

  • 这项研究揭示了αS在脂质界面上的度依赖的结构转变.
  • 在高度下,直立的αS形状可以解释帕金森病中脂质介导的粉样蛋白催化作用.
  • 研究结果提供了对膜表面αS聚合机制的结构性见解.