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000843873 1001_ $$0P:(DE-HGF)0$$aZhang, Tao$$b0
000843873 245__ $$aStoichiometric Zn 2+ interferes with the self-association of Aβ42: Insights from size distribution analysis
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000843873 520__ $$aThe abnormal aggregation of amyloid β (Aβ) peptides in the brain has been recognized as a central event in Alzheimer's disease (AD). Divalent metal ions such as Zn2+ have been shown to be closely involved in modulating Aβ self-association. Although the link between Zn2+ dyshomeostasis and brain Aβ deposition has been established, the effect of Zn2+ on the aggregation of Aβ is still incompletely clarified. By combining analytical ultracentrifugation (AUC), circular dichroism (CD) spectroscopy, thioflavin T (ThT) assay and atomic force microscopy (AFM) imaging, we analyzed the impact of stoichiometric Zn2+ on the aggregation process of Aβ42, the main toxic isoform of Aβ species in the brain. Aβ42 aggregates found in the presence of Zn2+ were smaller in size, non-fibrillary and showed less β-sheet structures than aggregates formed in absence of Zn2+. AUC showed that Zn2+ was capable of retaining monomeric Aβ42 in solution. Zn2+ chelation by EDTA totally reversed the inhibitory effect of Zn2+ on Aβ42 fibrillation. Our results provide further evidence that Zn2+ shifts the self-association of Aβ42 toward a non-fibrillary pathway by interfering with the aggregation process at multiple levels.
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000843873 7001_ $$0P:(DE-Juel1)162443$$aNagel-Steger, Luitgard$$b2$$eCorresponding author
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