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The Interplay Of Amyloid Peptides And Metal Ions-polymorphic Properties From The Perspective Of Computational Simulations | 12479
ISSN: 2161-0460
Journal of Alzheimers Disease & Parkinsonism
Open Access
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The pathogenesis of Alzheimer's disease (AD) has been suggested to be related to the amyloid ? (A?) peptides and metal
ions like Cu, Fe and Zn. From the soluble A? monomers to neurotoxic oligomers and mature fibrils, the conformational
transitions and aggregation process have been intensively investigated by various experiments. Metal ions could alter the misfolding
pathways of A? and modulate the oligomerization. However, A? peptides are prone to aggregation at physiological
condition, making it rather difficult to elucidate the mechanism of interactions between A? and metal ions from experiments.
Computational simulations provide an alternative way to examine their interactions at a molecular level. The presence of
heterogeneous conformations of A? either in free state or in metal-bound form suggests the polymorphic characteristics of A?
in aqueous solution. The effects of metal ions such as Zn and Cu on A? structure, thermodynamics and kinetics in particular
have been extensively studied in our recent works. The heterogeneous ensembles of conformational spaces of M-bound (M=Cu,
Zn) A? have been sampled by molecular dynamics (MD) simulations. It was found that the binding of metal ions affects the
overall structure of A?. Fee energy landscape characterized by dihedral principle component analysis reveals the feasibility of
conformational transitions. Markov state models further reveal the kinetic network of M-bound A?, and the role of ?-strand in
controlling the aggregation of A?. The combination of thermodynamic and quantum mechanics calculations predicts that Glu11
is the preferred oxygen ligand coordinated to Zn ion.
Biography
Liang Xu has completed his Ph.D. from Dalian University of Technology (DUT), China in 2009, and postdoctoral studies from the University of Texas
at San Antonio (2010). He is one of the research scientists of Institute of Computational Chemistry and Biology of DUT and also a senior lecturer
in the Department of Chemistry. He is interested in the development and application of computational simulations to investigate the interactions of
amyloid and metal ions, and has published several related papers in reputed journals.
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