铜/锌金属对淀粉样β肽(1-42)反应的分子见解

IF 3.7 Q2 CHEMISTRY, PHYSICAL ACS Physical Chemistry Au Pub Date : 2023-10-25 DOI:10.1021/acsphyschemau.3c00041
Anurag Prakash Sunda*,  and , Anuj Kumar Sharma*, 
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引用次数: 0

摘要

Aβ1-40肽和Aβ1-42肽是受阿尔茨海默病(AD)影响的大脑中β-淀粉样蛋白斑块的组成单位。受阿尔茨海默病(AD)影响的大脑中存在的各种二价金属离子(如 Cu 和 Zn)与 Aβ 肽中的不同氨基酸的结合亲和力成为探索它们在可溶性神经毒性寡聚体形成中的作用的焦点。众所周知,Cu2+ 金属离子可通过催化可溶性神经毒性低聚物的形成来增强 Aβ1-42 肽的神经毒性。Cu2+ 和 Zn2+ 同时与 Aβ 肽相互作用的竞争偏好尚不清楚。将二价 Cu 离子和 Zn 离子插入明确的 Aβ1-42 肽水性构型中,利用经典分子动力学(MD)模拟深入了解这些金属离子与肽的结合能力。金属离子相互作用揭示了不同肽位点的竞争性结合偏好具有金属离子特异性,且差异显著。对于 Cu2+,Asp-7、His-6、Glu-11 和 His-14 的相互作用更为显著。Asp-1、Glu-3、Asp-7、His-6、Glu-11 和 His-13 氨基酸残基对 Zn2+ 离子表现出更高的亲和力。MD 模拟显示,多肽疏水区域的可溶解表面积存在显著差异。与水溶液中的 Cu2+ 相比,Zn2+ 的迁移率微乎其微,而 Cu2+ 的扩散性在不同的时间尺度上有显著的偏差,这证明了其在水性 Aβ1-42 肽中的易变特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Molecular Insights into Cu/Zn Metal Response to the Amyloid β-Peptide (1–42)

Aβ1–40 peptide and Aβ1–42 peptide are the building units of beta-amyloid plaques present in Alzheimer’s disease (AD)-affected brain. The binding affinity of various divalent metal ions such as Cu and Zn present in AD-affected brain with different amino acids available in Aβ-peptide became the focus to explore their role in soluble neurotoxic oligomer formation. Cu2+ metal ions are known to enhance the neurotoxicity of the Aβ1–42 peptide by catalyzing the formation of soluble neurotoxic oligomers. The competitive preference of both Cu2+ and Zn2+ simultaneously to interact with the Aβ-peptide is unknown. The divalent Cu and Zn ions were inserted in explicit aqueous Aβ1–42 peptide configurations to get insights into the binding competence of these metal ions with peptides using classical molecular dynamics (MD) simulations. The metal-ion interactions reveal that competitive binding preferences of various peptide sites become metal-ion-specific and differ significantly. For Cu2+, interactions are found to be more significant with respect to those of Asp-7, His-6, Glu-11, and His-14. Asp-1, Glu-3, Asp-7, His-6, Glu-11, and His-13 amino acid residues show higher affinity toward Zn2+ ions. MD simulations show notable variation in the solvent-accessible surface area in the hydrophobic region of the peptide. Infinitesimal mobility was obtained for Zn2+ compared to Cu2+ in an aqueous solution and Cu2+ diffusivity deviated significantly at different time scales, proving its labile features in aqueous Aβ1–42 peptides.

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期刊介绍: ACS Physical Chemistry Au is an open access journal which publishes original fundamental and applied research on all aspects of physical chemistry. The journal publishes new and original experimental computational and theoretical research of interest to physical chemists biophysical chemists chemical physicists physicists material scientists and engineers. An essential criterion for acceptance is that the manuscript provides new physical insight or develops new tools and methods of general interest. Some major topical areas include:Molecules Clusters and Aerosols; Biophysics Biomaterials Liquids and Soft Matter; Energy Materials and Catalysis
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