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标题：Amyloid-beta–copper interaction studied by simultaneous nitrogen K and copper L 2,3 -edge soft X-ray absorption spectroscopy
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作者：Jinghui Luo ; Hongzhi Wang ; Jinming Wu 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2021
卷号：24
期号：12
页码：1-12
DOI：10.1016/j.isci.2021.103465
语种：English
出版社：Elsevier
摘要：SummaryWe study the interaction between amyloid β (Aβ) peptides and Cu and Zn metal ions by using soft X-ray absorption spectroscopy. The spectral features of the peptides and Cu are simultaneously characterized by recording spectra at the N K-edge and at the Cu L2,3-edges. In the presence of the peptides, the Cu L2,3-edge shows a fingerprint of monovalent Cu(I), caused by the interaction with the peptides. The appearance of Cu(I) is less significant at an acidic pH than at a basic pH. Furthermore, aggregation leads to a smaller signature of Cu(I). N K-edge spectra reveal that Cu and Zn ions exhibit a different coordination with the nitrogen atoms in the peptides. This suggests different roles of Cu and Zn in the peptide aggregation. Our work provides physical insight into the participation of the metal ions and Aβ in the toxic reactive oxygen species formation.Graphical abstractDisplay OmittedHighlights•Amyloid-beta–copper interaction leads to distinct X-ray spectroscopic signatures•After interaction monovalent copper(I) is found•The X-ray signatures strongly depend on the pH and incubation conditionsOrganometallic chemistry; Physical chemistry; Biophysical chemistry; Biochemistry