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Molecular Dynamics Research of the Interaction between Amyloid-β Protein and Zinc

Abstract

β-淀粉样蛋白(Aβ)在大脑中的过度聚集是阿尔兹海默氏症(AD)发生的关键因素,而锌在Aβ聚集过程中扮演着重要的角色,本文主要研究了锌与Aβ相互作用的分子动力学模拟。由于锌结合位点的配位模式十分复杂,因此仅考虑范德瓦尔斯相互作用和固定点电荷库仑相互作用还不能得到正确的配位结构。为了精确描述锌结合位点的相互作用,分子力场中还需要包含锌诱导的两个量子效应,即诱导极化和电荷转移。但是在水溶液中Aβ是不规则多肽,因此锌不仅影响结合位点,还会影响到Aβ的其它区域。为了描述锌离子的极化力对Aβ的全局性影响,我们发展了一个普适的多尺度诱导偶极子模型,即根据氨基酸残基与锌的距离,我们把锌诱导的...Alzheimer Disease is mainly arised from the over aggregating of Amyloid-β peptide (Aβ). Zinc is found play a key role in Aβaggregation. We mainly study the interaction between zinc and Aβ with molecular dynamics simulation. Due to the complexity of the coordinating mode of the zinc binding site, it’s far not enough to present the zinc-coupled interaction with the classical van der Waals interactio...学位:理学博士院系专业:物理与机电工程学院_理论物理学号:1982009015365

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