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Primary photochemistry and energetics leading to the oxidation of the (Mn)4Ca cluster and to the evolution of molecular oxygen in Photosystem II

✍ Scribed by Fabrice Rappaport; Bruce A. Diner

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
431 KB
Volume
252
Category
Article
ISSN
0010-8545

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✦ Synopsis

The recent availability of X-ray crystallographic structures of Photosystem II (PSII) together with refined steady-state and time-resolved spectroscopic analyses of site-directed mutants, are leading to a more detailed understanding of the function of this photosystem. Recent data have significantly modified the energetic picture of Photosystem II: the midpoint potentials of the first redox carriers in the chain leading to water-splitting have been reevaluated, the free-energy changes associated with the subsequent electron/proton transfer steps have been estimated and, last but not least, the free-energy landscape of the water-splitting reaction is starting to emerge with the identification of reaction intermediates and the free-energy changes associated with the formation of these transient species.

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