DETECTION OF A PARAMAGNETIC INTERMEDIATE IN THE S1-STATE OF THE PHOTOSYNTHETIC OXYGEN-EVOLVING COMPLEX
DETECTION OF A PARAMAGNETIC INTERMEDIATE IN THE S1-STATE OF THE PHOTOSYNTHETIC OXYGEN-EVOLVING COMPLEX
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DOI：
10.1021/ja00034a010
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发表时间：
1992-04-08
影响因子：
15
通讯作者：
KLEIN, MP
中科院分区：
文献类型：
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作者：
DEXHEIMER, SL;KLEIN, MP
我们报告检测到一个新的电子顺磁共振（EPR）信号，表明存在一个顺磁中间体在休息（S1）状态的光合放氧复合物。该信号是使用平行极化EPR方法检测到的，该方法对高自旋系统中的Δ m = 0跃迁敏感。在S1状态的平行极化EPR信号的属性是一致的交换耦合锰中心的S = 1自旋状态，对应于减少的形式的物种引起的多线EPR信号在光诱导的S2状态。的电子结构的氧演变复杂的影响进行了讨论。
We report the detection of a new electron paramagnetic resonance (EPR) signal that demonstrates the presence of a paramagnetic intermediate in the resting (S1) state of the photosynthetic oxygen-evolving complex. The signal was detected using the method of parallel polarization EPR, which is sensitive to DELTA-m = 0 transitions in high spin systems. The properties of the parallel polarization EPR signal in the S1 state are consistent with an S = 1 spin state of an exchange-Coupled manganese center that corresponds to the reduced form of the species giving rise to the multiline EPR signal in the light-induced S2 state. The implications for the electronic structure of the oxygen-evolving complex are discussed.