Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
The Structure of Photosystem II and the Mechanism of Water Oxidation in Photosynthesis
Ist Teil von
Annual review of plant biology, 2015-04, Vol.66 (1), p.23-48
Ort / Verlag
United States: Annual Reviews
Erscheinungsjahr
2015
Quelle
MEDLINE
Beschreibungen/Notizen
Oxygenic photosynthesis forms the basis of aerobic life on earth by converting light energy into biologically useful chemical energy and by splitting water to generate molecular oxygen. The water-splitting and oxygen-evolving reaction is catalyzed by photosystem II (PSII), a huge, multisubunit membrane-protein complex located in the thylakoid membranes of organisms ranging from cyanobacteria to higher plants. The structure of PSII has been analyzed at 1.9-Å resolution by X-ray crystallography, revealing a clear picture of the Mn
4
CaO
5
cluster, the catalytic center for water oxidation. This article provides an overview of the overall structure of PSII followed by detailed descriptions of the specific structure of the Mn
4
CaO
5
cluster and its surrounding protein environment. Based on the geometric organization of the Mn
4
CaO
5
cluster revealed by the crystallographic analysis, in combination with the results of a vast number of experimental studies involving spectroscopic and other techniques as well as various theoretical studies, the article also discusses possible mechanisms for water splitting that are currently under consideration.