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High-frequency 180 GHz PELDOR

机译:高频180 GHz PELDOR

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摘要

For aromatic organic radicals, pulsed electron-electron double resonance (PELDOR) experiments at high magnetic fields offer the possibility to achieve orientation-selective pumping and detection that could allow one not only to determine the distance between paramagnetic species but also their relative orientation with respect to the interconnecting dipolar axis. We present a PELDOR two-frequency setup that was introduced into our homebuilt 180 GHz pulsed electron paramagnetic resonance (EPR) spectrometer and we discuss its technical and experimental features. The capability of 180 GHz PELDOR has been tested using the three-pulse ELDOR sequence on the protein RNR-R2 (ribonucleotide reductase) from Escherichia coli, which contains two tyrosyl radicals at a distance of 3.3 nm. At 180 GHz, orientation selectivity is observed and the modulation frequency was found in good agreement with theoretical predictions, which take into account the relative orientation of the radicals from X-ray data.
机译:对于芳族有机基团,高磁场下的脉冲电子双共振(PELDOR)实验提供了实现定向选择泵浦和检测的可能性,该泵浦和检测不仅可以确定顺磁性物质之间的距离,还可以确定它们相对于分子的相对取向。到相互连接的偶极轴。我们介绍了一种PELDOR两频装置,该装置已引入我们的内置180 GHz脉冲电子顺磁共振(EPR)光谱仪中,并讨论了其技术和实验特性。已使用来自大肠杆菌的RNR-R2蛋白(核糖核苷酸还原酶)上的三脉冲ELDOR序列测试了180 GHz PELDOR的能力,该蛋白在3.3 nm的距离处包含两个酪氨酰基。在180 GHz时,观察到了定向选择性,并且发现调制频率与理论预测非常吻合,其中考虑了X射线数据中自由基的相对取向。

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