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- W2012951666 endingPage "287" @default.
- W2012951666 startingPage "275" @default.
- W2012951666 abstract "Oxidation of H2O by photosystem II is a unique redox reaction in that it requires Ca2+ as well as Cl− as obligatory activators/cofactors of the reaction, which is catalyzed by Mn atoms. The properties of the binding site for Ca2+ in this reaction resemble those of other Ca2+ binding proteins, and recent X-ray structural data confirm that the metal is in fact ligated at least in part by amino acid side chain oxo anions. Removal of Ca2+ blocks water oxidation chemistry at an early stage in the cycle of redox reactions that result in O-O bond formation, and the intimate involvement of Ca2+ in this reaction that is implied by this result is confirmed by an ever-improving set of crystal structures of the cyanobacterial enzyme. Here, we revisit the photosystem II Ca2+ site, in part to discuss the additional information that has appeared since our earlier review of this subject (van Gorkom HJ, Yocum CF In: Wydrzynski TJ, Satoh K (eds) Photosystem II: the light-driven water:plastoquinone oxidoreductase), and also to reexamine earlier data, which lead us to conclude that all S-state transitions require Ca2+." @default.
- W2012951666 created "2016-06-24" @default.
- W2012951666 creator A5008509272 @default.
- W2012951666 creator A5009661755 @default.
- W2012951666 creator A5086499619 @default.
- W2012951666 date "2007-01-19" @default.
- W2012951666 modified "2023-10-03" @default.
- W2012951666 title "The PSII calcium site revisited" @default.
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