title: Dioxygen activation in the Cu-amyloid β complex.
abstract: We investigate, by means of density-functional theory, the binding of dioxygen to Cu(I)-amyloid β (Aβ), one of the first steps in the oxidation of ascorbate by dioxygen. Cu, Aβ, ascorbate and dioxygen are all present in the synapse during neurodegeneration, when the above species can trigger an irreversible oxidative stress inducing the eventual death of neurons. The binding of dioxygen to Cu(I) is possible and its role in dioxygen activation of Cu ligands and of residues in the first coordination sphere is described in atomic detail. Dioxygen is activated when a micro-environment suitable for a square-planar Cu(2+) coordination is present and a negatively charged group like Asp 1 carboxylate takes part in the Cu coordination anti to O2.
authors.affiliation: Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain. Mariona.Sodupe@uab.cat.
authors.forename: Andrea
authors.initials: A
authors.lastname: Mirats
authors.forename: Jorge
authors.initials: J
authors.lastname: Alí-Torres
authors.forename: Luis
authors.initials: L
authors.lastname: Rodríguez-Santiago
authors.forename: Mariona
authors.initials: M
authors.lastname: Sodupe
authors.forename: Giovanni
authors.initials: G
authors.lastname: La Penna
mesh_terms: D016229:Amyloid beta-Peptides / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D008024:Ligands; D009942:Organometallic Compounds / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D011789:Quantum Theory
chemical_list: D016229:Amyloid beta-Peptides; D008024:Ligands; D009942:Organometallic Compounds; D003300:Copper; D010100:Oxygen