光合放氧复合体（Mn）4簇光组装的金属自由基假说。
Metallo-radical hypothesis for photoassembly of (Mn)4-cluster of photosynthetic oxygen evolving complex.
作者信息
Ono T
机构信息
Laboratory for Photo-Biology, RIKEN Photodynamics Research Center, The Institute of Physical and Chemical Research, 519-1399 Aoba, Aramaki, Sendai 980-0845, Aoba, Japan.
出版信息
Biochim Biophys Acta. 2001 Jan 5;1503(1-2):40-51. doi: 10.1016/s0005-2728(00)00226-7.
A new hypothetical mechanism is proposed for photoassembly of the (Mn)4-cluster of the photosynthetic oxygen evolving complex (OEC). In this process, a neutral radical of Y(Z) tyrosine plays a role in oxidizing Mn2+ associated with an apo-OEC, and also in abstracting a proton from a water molecule bound to the Mn2+ ion, together with D1-His190. This is in a similar fashion to the metallo-radical mechanism proposed for photosynthetic water oxidation by the (Mn)4-cluster. The model insists that a common mechanism participates in the photoassembly of the (Mn)4-cluster and the photosynthetic water oxidation.
针对光合放氧复合体（OEC）的（Mn）4簇的光组装，提出了一种新的假设机制。在这个过程中，Y（Z）酪氨酸的中性自由基在氧化与脱辅基OEC相关的Mn2+以及与D1-His190一起从与Mn2+离子结合的水分子中夺取一个质子方面发挥作用。这与（Mn）4簇进行光合水氧化所提出的金属自由基机制类似。该模型认为，一种共同机制参与了（Mn）4簇的光组装和光合水氧化过程。
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