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首页> 外文期刊>Biochemistry >An oscillating manganese electron paramagnetic resonance signal from the S0 state of the oxygen evolving complex in photosystem II
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An oscillating manganese electron paramagnetic resonance signal from the S0 state of the oxygen evolving complex in photosystem II

机译：来自光系统II中析氧复合物的S0态的振荡锰电子顺磁共振信号

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摘要

Photosynthesis produces the oxygen necessary for all aerobic life. During this process, the manganese-containing oxygen evolving complex (OEC) in photosystem II (PSII), cycles through five oxidation states, S0-S4. One of these, S2, is known to be paramagnetic and gives rise to electron paramagnetic resonance (EPR) signals used to probe the catalytic structure and function of the OEC. The S0 states has long been thought to be paramagnetic. We report here a Mn EPR signal from the previously EPR invisible S0 state. The new signal oscillates with a period of four, indicating that it originates from fully active PSII centers. Although similar to the S2 state multiline signal, the new signal is wider (2200 gauss compared with 1850 gauss in samples produced by flashing), with different peak intensity and separation (82 gauss compared with 89 gauss). These characteristics are consistent with the S0 state EPR signal arising from a coupled MnII-MnIII intermediate. The new signal is more stable than the S2 state signal and its decay in tens of minutes is indicative of it originating from the S0 state. The S0 state signal will provide invaluable information toward the understanding of oxygen evolution in plants.
机译：光合作用产生所有有氧生活所需的氧气。在此过程中，光系统II（PSII）中的含锰析氧复合物（OEC）循环通过五个氧化态S0-S4。其中之一，S2，已知是顺磁性的，会引起电子顺磁共振（EPR）信号，用于探测OEC的催化结构和功能。长期以来人们一直认为S0状态是顺磁性的。我们在这里报告来自先前EPR不可见S0状态的Mn EPR信号。新信号以四个周期振荡，表明它来自完全活动的PSII中心。尽管与S2状态多线信号相似，但新信号更宽（在闪烁生成的样本中为2200高斯，与1850高斯相比），具有不同的峰值强度和分离度（82高斯与89高斯）。这些特性与耦合的MnII-MnIII中间体产生的S0状态EPR信号一致。新信号比S2状态信号更稳定，它在几十分钟内的衰减表明它起源于S0状态。 SO状态信号将为了解植物中的氧气释放提供宝贵的信息。

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