首页> 外文会议>International Congress of Photosynthesis >MECHANISM OF THE PHOTOSYNTHETIC WATER OXIDATION REACTION CATALYZED BY A NOBLE Mn_4CaCl-BICARBONATE CLUSTER
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MECHANISM OF THE PHOTOSYNTHETIC WATER OXIDATION REACTION CATALYZED BY A NOBLE Mn_4CaCl-BICARBONATE CLUSTER

机译:贵普布尔Mn_4CaCl-碳酸氢盐簇催化的光合水氧化反应的机理

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Cyanobacteria and plants can transform light energy into chemical energy by the photosynthetic water oxidation process, which is catalyzed by a tetranuclear manganese cluster with tyrosine Y_Z nearby on the donor side of the reaction center P680 in photosystem II (PSII). The driving force of this reaction is generated by a Y_Z+/Y_Z couple subsequently transferred from a photogenerated P680~+/P680 couple, with a high redox potential of 1.1-1.3 V (Tommos et al 2000, Renger 2001, Carrell et al 2003). This serial generation of the oxidation species drives the enzyme-substrate complex to evolve oxygen via five S_i-states (i = 0-4) (Joliot and Kok 1975). Recently, the x-ray crystal structures of cyanobacteria PSII at resolution of 3.8 A (Zouni et al 2001), 3.7A (Kamiya and Shen 2003), and 3.5A (Ferreira et al 2004) has been reported, and Ferreira et al proposed a detailed model for the oxygen-evolving complex (OEC), despite of such low-resolution data.
机译:Cyanobacteria和植物可以通过光合水氧化过程将光能转化为化学能量,该光合水氧化过程将通过与酪氨酸Y_Z的四核锰簇催化在照相系统II(PSII)中的反应中心P680的供体侧。该反应的驱动力由随后从光生P680〜+ / p680夫妇转移的Y_Z + / Y_Z耦合产生,高氧化还原电位为1.1-1.3V(Tommos等,Renger 2001,Carrell等,2003) 。该氧化物种的连续产生驱动酶 - 底物络合物以通过五个S_I态(i = 0-4)(慢速和KOK 1975)进化氧气。最近,报告了3.8a(Zouni等人2001),3.7a(kamiya和shen 2003)的分辨率下的蓝曲杆菌psii的X射线晶体结构,以及3.5a(Ferreira等人2004),并提出了Ferreira等尽管有这样的低分辨率数据,但耗氧复合物(OEC)的详细模型。

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