Brudvig G W
J Bioenerg Biomembr. 1987 Apr;19(2):91-104. doi: 10.1007/BF00762719.
A polynuclear manganese complex functions in Photosystem II both to accumulate oxidizing equivalents and to bind water and catalyze its four-electron oxidation. Recent electron paramagnetic resonance (EPR) spectroscopic studies of the manganese complex show that four manganese ions are required to account for its magnetic properties. The exchange couplings between manganese ions in the S2 state are characteristic of a Mn4O4 "cubane"-like structure. Based on this structure for the manganese complex in the S2 state, as well as a consideration of the known properties of the manganese complex in Photosystem II and the coordination chemistry of manganese, structures are proposed for the five intermediate oxidation states of the manganese complex. A molecular mechanism for the formation of an O-O bond and the displacement of O2 from the S4 state is suggested.
一种多核锰配合物在光系统II中发挥作用，既能积累氧化当量，又能结合水并催化其四电子氧化。最近对该锰配合物的电子顺磁共振（EPR）光谱研究表明，需要四个锰离子来解释其磁性。S2状态下锰离子之间的交换耦合具有Mn4O4“立方烷”样结构的特征。基于S2状态下该锰配合物的这种结构，以及对光系统II中锰配合物的已知性质和锰的配位化学的考虑，提出了该锰配合物五个中间氧化态的结构。提出了一种形成O - O键以及从S4状态置换O2的分子机制。
