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 Å 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. © 2011 American Chemical Society.
Structural-functional role of chloride in photosystem II / Rivalta, Ivan*; Amin, Muhamed; Luber, Sandra; Vassiliev, Serguei; Pokhrel, Ravi; Umena, Yasufumi; Kawakami, Keisuke; Shen, Jian-Ren; Kamiya, Nobuo; Bruce, Doug; Brudvig, Gary W.; Gunner, M.R.; Batista, Victor S.. - In: BIOCHEMISTRY. - ISSN 0006-2960. - STAMPA. - 50:29(2011), pp. 6312-6315. [10.1021/bi200685w]
Structural-functional role of chloride in photosystem II
Rivalta, Ivan
;
2011
Abstract
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 Å 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. © 2011 American Chemical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
