Chloride Control of the Mechanism of Human Serum Ceruloplasmin (Cp) Catalysis.

Chloride Control of the Mechanism of Human Serum Ceruloplasmin (Cp) Catalysis.
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人血清铜蓝蛋白 (Cp) 催化机制的氯化物控制。

DOI:
10.1021/jacs.9b03661
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发表时间:
2019
影响因子:
15
通讯作者:
Solomon,EdwardI
Solomon,EdwardI
中科院分区:
化学1区
文献类型:
--
作者:
Tian,Shiliang;Jones,StephenM;Jose,Anex;Solomon,EdwardI

文献摘要

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阐明铜蓝蛋白(Cp)的作用机制对于理解金属介导的疾病和金属神经毒性的发病机制具有重要意义。在这里,我们报告说,Cl-,最丰富的阴离子在血浆中,是一个关键组成部分的Cp催化。基于详细的光谱分析,Cl-优先与部分还原的三核Cu簇(TNC)在Cp在生理条件下的相互作用和移动的两个氧化还原活性类型1(T1)的Cu网站和TNC之间的电子平衡分布。这种电位的变化使分子内电子转移(IET)从T1 Cu到天然中间体(NI),并加速IET从T1 Cu到TNC,导致更快的周转Cp催化。
Unraveling the mechanism of ceruloplasmin (Cp) is fundamentally important toward understanding the pathogenesis of metal-mediated diseases and metal neurotoxicity. Here we report that Cl–, the most abundant anion in blood plasma, is a key component of Cp catalysis. Based on detailed spectroscopic analyses, Cl–preferentially interacts with the partially reduced trinuclear Cu cluster (TNC) in Cp under physiological conditions and shifts the electron equilibrium distribution among the two redox active type 1 (T1) Cu sites and the TNC. This shift in potential enables the intramolecular electron transfer (IET) from the T1 Cu to the native intermediate (NI) and accelerates the IET from the T1 Cu to the TNC, resulting in faster turnover in Cp catalysis.