Journal
CHEMPHYSCHEM
Volume 11, Issue 6, Pages 1160-1171Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200900901
Keywords
channels; lipids; photosystem II; plastoquinone; water oxidation
Funding
- DFG-Sonderforschungsbereich 498 [A4, C7]
- DFG-Cluster of Excellence [B1]
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The photosynthetic oxygen-evolving photosystem II (PSII) is the only known biochemical system that is able to oxidize water molecules and thereby generates almost all oxygen in the Earth's atmosphere. The elucidation of the structural and mechanistic aspects of PSII keeps scientists all over the world engaged since several decades. In this Minireview, we outline the progress in understanding PSII based on the most recent crystal structure at 2.9 angstrom resolution. A likely position of the chloride ion, which is known to be required for the fast turn-over of water oxidation, could be determined in native PSI) and is compared with work on bromide and iodide substituted PSII. Moreover, eleven new integral lipids could be assigned, emphasizing the importance of lipids for the perfect function of PSII. A third plastoquinone molecule (Q) and a second quinone transfer channel are revealed, making it possible to consider different mechanisms for the exchange of plastoquinone/plastoquinol molecules. In addition, possible transport channels for water, dioxygen and protons are identified.
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