Effect of Taiwan Mutation (D7H) on Structures of Amyloid-尾 Peptides: Replica Exchange Molecular Dynamics Study

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• 作者：Phan Minh Truong ; Man Hoang Viet ; Phuong H. Nguyen ; Chin-Kun Hu ; Mai Suan Li
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：July 31, 2014
• 年：2014
• 卷：118
• 期：30
• 页码：8972-8981
• 全文大小：538K
• ISSN：1520-5207

文摘

Recent experiments have shown that the Taiwan mutation (D7H) slows the fibril formation of amyloid peptides A尾₄₀ and A尾₄₂. Motivated by this finding, we have studied the influence of D7H mutation on structures of A尾 peptide monomers using the replica exchange molecular dynamics simulations with OPLS force field and implicit water model. Our study reveals that the mechanism behind modulation of aggregation rates is associated with decrease of 尾-content and dynamics of the salt bridge D23鈥揔28. Estimating the bending free energy of this salt bridge, we have found that, in agreement with the experiments, the fibril formation rate of both peptides A尾₄₀ and A尾₄₂ is reduced about two times by mutation.