Nanomolar Pulse Dipolar EPR Spectroscopy in Proteins: Cu(II)-Cu(II) and Nitroxide-Nitroxide Cases.

Nanomolar Pulse Dipolar EPR Spectroscopy in Proteins: Cu(II)-Cu(II) and Nitroxide-Nitroxide Cases.
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DOI:
10.1021/acs.jpcb.1c03666
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发表时间:
2021-05-27
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Bode BE
Bode BE
中科院分区:
其他
文献类型:
--
作者:
Ackermann K;Wort JL;Bode BE

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一套互补的生物物理方法促进了对与人类健康和疾病有关的更复杂的生物分子组合的研究。脉冲偶极电子顺磁共振光谱(PDS)是一种强大的工具,可以在冷冻溶液中提供高精度的几何约束,然而,在生理相关的亚μ m浓度下,PDS的发展受到目前可实现的浓度灵敏度的限制。最近,PDS使用氮氧化物和基于CuII的自旋标记的组合,可以测量500 nM浓度的模型蛋白。使用商业仪器和自旋标签,我们演示了CuII-CuII和氮氧化物-氮氧化物PDS测量在蛋白质浓度低于前面的例子分别达到500和100 nM。这些结果证明了在中短距离(~1.5 ~ 3.5 nm)测量亚μ m PDS的总体可行性,并且特别适用于可达到浓度有限的应用。
The study of ever more complex biomolecular assemblies implicated in human health and disease is facilitated by a suite of complementary biophysical methods. Pulse Dipolar electron paramagnetic resonance Spectroscopy (PDS) is a powerful tool that provides highly precise geometric constraints in frozen solution, however the drive towards PDS at physiologically relevant sub-μM concentrations is limited by the currently achievable concentration sensitivity. Recently, PDS using a combination of nitroxide and CuII based spin labels allowed measuring 500 nM concentration of a model protein. Using commercial instrumentation and spin labels we demonstrate CuII-CuII and nitroxide-nitroxide PDS measurements at protein concentrations below previous examples reaching 500 and 100 nM, respectively. These results demonstrate the general feasibility of sub-μM PDS measurements at short to intermediate distances (~1.5 - 3.5 nm), and are of particular relevance for applications where the achievable concentration is limiting.
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