Evidence for copper-dioxygen reactivity during alpha-synuclein fibril formation.
Evidence for copper-dioxygen reactivity during alpha-synuclein fibril formation.
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DOI:
10.1021/ja101756m
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发表时间:
2010-05-19
影响因子:
15
通讯作者:
Lee JC
中科院分区:
文献类型:
--
作者:
Lucas HR;Debeer S;Hong MS;Lee JC
α-Synuclein (α-syn), a presynaptic protein implicated in Parkinson’s disease, binds copper(II) ion (1:1) with submicromolar affinity in vitro. Insights on the molecular details of soluble-and fibrillar-Cu-α-syn are gained through X-ray absorption spectroscopy. Our results indicate that the copper coordination environment (3-to-4 N/O ligands, average Cu-ligand distance ~1.96 Å) exhibits little structural rearrangement upon amyloid formation in spite of the overall polypeptide conformational change from disordered-to-β-sheet. Interestingly, we find that some population of CuII-α-syn reduces to CuI-α-syn in the absence of O2. This autoreduction event appears diminished in the presence of O2 suggestive of preceding CuI/O2 chemistry. Evidence for generation of reactive oxygen species is obtained by the observation of new emission features attributed to dityrosine crosslinks in fibrillar samples.
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