Structural-functional role of chloride in photosystem II

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

Research output: Contribution to journalArticlepeer-review

115 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)6312-6315
Number of pages4
Issue number29
Publication statusPublished - Jul 26 2011

ASJC Scopus subject areas

  • Biochemistry


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