Extending electron paramagnetic resonance to nanoliter volume protein single crystals using a self-resonant microhelix
Extending electron paramagnetic resonance to nanoliter volume protein single crystals using a self-resonant microhelix
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使用自谐振微螺旋将电子顺磁共振扩展到纳升体积蛋白质单晶
DOI:
10.1126/sciadv.aay1394
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发表时间:
2019
期刊:
影响因子:
13.6
通讯作者:
Reijerse
中科院分区:
文献类型:
--
作者:
Sidabras;Winkler;Hussein;Schnegg;Lubitz;Reijerse
Electron paramagnetic resonance (EPR) spectroscopy on protein single crystals is the ultimate method for determining the electronic structure of paramagnetic intermediates at the active site of an enzyme and relating the magnetic tensor to a molecular structure. However, crystals of dimensions typical for protein crystallography (0.05 to 0.3mm) provide insufficient signal intensity. In this work, we present a microwave self-resonant microhelix for nanoliter samples that can be implemented in a commercial X-band (9.5 GHz) EPR spectrometer. The self-resonant microhelix provides a measured signal-to-noise improvement up to a factor of 28 with respect to commercial EPR resonators. This work opens up the possibility to use advanced EPR techniques for studying protein single crystals of dimensions typical for x-ray crystallography. The technique is demonstrated by EPR experiments on single crystal [FeFe]-hydrogenase (Clostridium pasteurianum; CpI) with dimensions of 0.3 mm by 0.1 mm by 0.1 mm, yielding a proposedg-tensor orientation of the Hoxstate.
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影响因子:
2.3
作者:
Greco, Claudio;Silakov, Alexey;Lubitz, Wolfgang
通讯作者:
Lubitz, Wolfgang
影响因子:
1.6
作者:
Narkowicz, R.;Suter, D.;Niemeyer, I.
通讯作者:
Niemeyer, I.
DOI:
10.1063/1.4906898
发表时间:
2015
期刊:
The Review of scientific instruments
影响因子:
--
作者:
Narkowicz
通讯作者:
Narkowicz
影响因子:
18.3
作者:
Bowman SE;Bridwell-Rabb J;Drennan CL
通讯作者:
Drennan CL
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
H. Mahdjour;W. Clark;K. Baberschke
通讯作者:
K. Baberschke