Evidence for copper-dioxygen reactivity during alpha-synuclein fibril formation.

Evidence for copper-dioxygen reactivity during alpha-synuclein fibril formation.
复制标题

DOI:
10.1021/ja101756m
复制
发表时间:
2010-05-19
影响因子:
15
通讯作者:
Lee JC
Lee JC
中科院分区:
化学1区
文献类型:
--
作者:
Lucas HR;Debeer S;Hong MS;Lee JC

文献摘要

参考文献

被引文献

相似文献

α-突触核蛋白(α-syn)是一种与帕金森病有关的突触前蛋白,在体外以亚微摩尔亲和力与铜离子(1:1)结合。通过X-射线吸收光谱分析获得了可溶性和纤维状Cu-α-syn的分子细节。我们的研究结果表明,铜配位环境(3至4个N/O配体,平均Cu-配体距离~1.96 μ m)在淀粉样蛋白形成后几乎没有结构重排,尽管整体多肽构象从无序变为β-折叠。有趣的是,我们发现,一些人口的CuII-α-syn减少到CuI-α-syn在没有O2。这种自动还原事件出现减少在O2的存在下,提示先前的CuI/O2化学。通过观察纤维状样品中的双酪氨酸交联引起的新的发射特征,获得了产生活性氧的证据。
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.
DOI: 10.1073/pnas.0712179105
发表时间: 2008-06-24
影响因子: 11.1
作者:
Vilar, Marcal;Chou, Hui-Ting;Riek, Roland
通讯作者: Riek, Roland
DOI: 10.1002/anie.200803908
发表时间: 2008-01-01
影响因子: 16.6
作者:
Himes, Richard A.;Park, Ga Young;Karlin, Kenneth D.
通讯作者: Karlin, Kenneth D.
DOI: 10.1021/ic901157w
发表时间: 2009-10-05
影响因子: 4.6
作者:
Jackson, Mark S.;Lee, Jennifer C.
通讯作者: Lee, Jennifer C.
DOI: 10.1074/jbc.m700368200
发表时间: 2007-08-24
影响因子: 4.8
作者:
Chen, Min;Margittai, Martin;Langen, Ralf
通讯作者: Langen, Ralf
DOI: 10.1016/j.jsb.2005.06.006
发表时间: 2005-09-01
影响因子: 3
作者:
Khurana, R;Coleman, C;Singh, S
通讯作者: Singh, S