Targeting a Dark Excited State of HIV-1 Nucleocapsid by Antiretroviral Thioesters Revealed by NMR Spectroscopy.

Targeting a Dark Excited State of HIV-1 Nucleocapsid by Antiretroviral Thioesters Revealed by NMR Spectroscopy.
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DOI:
10.1002/anie.201713172
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发表时间:
2018-03-01
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Clore GM
Clore GM
中科院分区:
其他
文献类型:
--
作者:
Deshmukh L;Tugarinov V;Appella DH;Clore GM

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HIV-1核衣壳蛋白(NCp7)是一个由两个Cys2HisCys锌指关节(N-锌和C-锌)组成的蛋白,在病毒复制中起关键作用。用核磁共振弛豫色散法和化学交换饱和转移法表征了NCp7的构象动力学。当N-锌指关节构象稳定时,C-锌指关节在毫秒级的时间尺度上,在三个半胱氨酸和一个组氨酸配位锌的主要状态和其中一个配位键(Cys413-Sγ-Zn或His421-Nε2-锌)被水解的两个折叠的次要物种之间发生相互转换。这些发现解释了为什么抗逆转录病毒硫代酯通过Cys413的初始酰化来特异性地破坏C-锌关节,并表明蛋白质的瞬时、稀疏(“暗”)激发状态可以为合理的药物设计提供有效的靶点。
HIV-1 nucleocapsid (NCp7) is a two Cys2HisCys zinc knuckle (N-Zn and C-Zn) protein that plays a key role in viral replication. NCp7 conformational dynamics is characterized by NMR relaxation dispersion and chemical exchange saturation transfer measurements. While the N-Zn knuckle is conformationally stable, the C-Zn knuckle interconverts on the millisecond timescale between the major state, in which the zinc is coordinated by three cysteines and a histidine, and two folded minor species (with populations around 1%) in which one of the coordination bonds (Cys413-Sγ-Zn or His421-Nε2-Zn) is hydrolyzed. These findings explain why antiretroviral thioesters specifically disrupt the C-Zn knuckle by initial acylation of Cys413, and show that transient, sparsely-populated (“dark”), excited states of proteins can present effective targets for rational drug design.
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