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铜离子(II)抑制Aβ多肽聚集机理的分子模拟 被引量:6

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摘要 大脑中淀粉样β多肽(Aβ)的纤维化沉积是Alzheimer氏症(AD)的一个关键性病理事件.体外实验发现,近生理浓度的锌离子即有很强的诱导Aβ聚集的能力.铜离子在一定条件下能够强烈地抑制锌离子诱导的Aβ聚集.铜离子作为体内锌离子的潜在抑制剂引起了人们的关注.本文通过分子模拟法研究了铜离子抑制Aβ聚集的可能机理.在单环模式中发现Y10残基有明显的促螺旋化作用,[Cu-H13(Nπ)-Y10(OH)]配合物形成了局部准3.010螺旋结构.在多环模式中发现Q15和E11残基的侧链协同配位使体系能量大幅降低,变构效应显著.配合物[Cu-3N-Q15(O)-E11(O1)]和[Cu-H13(Nπ)-Y10(OH)]由于变构为准螺旋构象,极可能以可溶形式存在于溶液中.另外,发现氢键作用是Aβ聚集的主要驱动力.以上结果将有助于进一步加深对铜离子与AD致病机制之间关系的理解并制定相应的“抗淀粉样沉积”的治疗策略.
出处 《中国科学(B辑)》 CSCD 北大核心 2005年第4期303-311,共9页 Science in China(Series B)
基金 国家自然科学基金资助项目(批准号:30470408)
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参考文献18

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