Calcium in the oxygen-evolving complex: Structural and mechanistic role determined by X-ray spectroscopy

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• 作者：Vittal K. Yachandra ; ^a ; ^{VKYachandra@lbl.gov"" rel=""nofollow} ; Junko Yano ; ^a ; ^{JYano@LBL.GOV"" rel=""nofollow}
• 关键词：Manganese ; Calcium ; Oxygen-evolving complex ; Photosystem II ; X-ray Absorption Spectroscopy
• 刊名：Journal of Photochemistry and Photobiology B: Biology
• 出版年：2011
• 出版时间：July-August 2011
• 年：2011
• 卷：104
• 期：1-2
• 页码：51-59
• 全文大小：949 K

文摘

This review describes the results from X-ray Absorption Spectroscopy studies that have contributed to an understanding of the role of Ca in the photosynthetic water-oxidation reaction. The results include the first Mn, Ca and Sr X-ray spectroscopy studies using Ca or Sr-substituted PS II samples that established the presence of a MnCa heteronuclear structure and its orientation, and the most recent Sr X-ray spectroscopy study using biosynthetically prepared Sr-containing PS II in the various S-states that provide important insights into the requirement for Ca in the mechanism of the Mn₄Ca catalytic center.