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Copper reduction and dioxygen activation in Cu-Amyloid Beta peptide complexes. Insight from molecular modelling

Abstract

Alzheimer’s disease (AD) involves a number of factors including an anomalous interaction of copper with the amyloid peptide (Aβ), inducing oxidative stress with radical oxygen species (ROS) production through a three-step Fenton-like cycle in which O2 is gradually reduced to superoxide, oxygen peroxide and finally to OH radicals. The purpose of this work has been to investigate the reactivity of 14 different Cu(II)–Aβ coordination modes with the aim of identifying on energy basis (Density Functional Theory -DFT- and classic Molecular Dynamics -MD-) the redox competent form(s). Accordingly, we have specifically focused on the first three steps of the Fenton cycle, i.e ascorbate binding to Cu(II), Cu(II)→Cu(I) reduction and O2 reduction to O2-. Compared to the recent literature, our results broadens the set of possible redox competent metallopeptide forms responsible for ROS production. Indeed, in addition to the three-coordinated species containing one His ligand, a N-terminal amine group and the carboxylate side chain of the Asp1 residue of Aβ already proposed, we found two other Cu-Aβ coordination modes involving two histidines.

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Publication details

The article was received on 30 Jul 2018, accepted on 04 Oct 2018 and first published on 10 Oct 2018


Article type: Paper
DOI: 10.1039/C8MT00216A
Citation: Metallomics, 2018, Accepted Manuscript
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    Copper reduction and dioxygen activation in Cu-Amyloid Beta peptide complexes. Insight from molecular modelling

    F. Arrigoni, T. Prosdocimi, L. Mollica, G. Zampella, L. De Gioia and L. Bertini, Metallomics, 2018, Accepted Manuscript , DOI: 10.1039/C8MT00216A

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