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The fatal neurological disorder Alzheimer's disease has been linked to soluble neurotoxic oligomers of amyloid-β (Aβ) peptides. Herein we demonstrate that Cu(1+) ligated within Aβ(42) oligomers (Aβ sequence: DAEFRHDSGYEVHHQKLVFFAEDVGSNKGAIIGLMVGGVVIA) possesses a highly dioxygen sensitive tetrahedral coordination geometry. The biological implications of these findings are discussed.

Cu K-edge X-ray absorption spectroscopy reveals differential copper coordination within amyloid-β oligomers compared to amyloid-β monomers