Structural鈥揊unctional Role of Chloride in Photosystem II

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• 作者：Ivan Rivalta ; Muhamed Amin ; Sandra Luber ; Serguei Vassiliev ; Ravi Pokhrel ; Yasufumi Umena ; Keisuke Kawakami ; Jian-Ren Shen ; Nobuo Kamiya ; Doug Bruce ; Gary W. Brudvig ; M. R. Gunner ; Victor S. Batista
• 刊名：Biochemistry
• 出版年：2011
• 出版时间：July 26, 2011
• 年：2011
• 卷：50
• 期：29
• 页码：6312-6315
• 全文大小：749K
• 年卷期：v.50,no.29(July 26, 2011)
• ISSN：1520-4995

文摘

Chloride binding in photosystem II (PSII) is essential for photosynthetic water oxidation. However, the functional roles of chloride and possible binding sites, during oxygen evolution, remain controversial. This paper examines the functions of chloride based on its binding site revealed in the X-ray crystal structure of PSII at 1.9 脜 resolution. We find that chloride depletion induces formation of a salt bridge between D2-K317 and D1-D61 that could suppress the transfer of protons to the lumen.