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The Structure of the Mn₄Ca²⁺ Cluster of Photosystem II and Its Protein Environment as Revealed by X-Ray Crystallography
James Barber and James W. Murray
Philosophical Transactions: Biological Sciences
Vol. 363, No. 1494, Revealing How Nature Uses Sunlight to Split Water (Mar. 27, 2008), pp. 1129-1138
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/20208496
Page Count: 10
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The location, structure and protein environment of the Mn₄Ca²⁺ cluster, which catalyses the light-driven, water-splitting reaction of photosystem II, has been revealed by X-ray crystallography. However, owing to the low resolutions of the crystal structures reported to date, and the possibility of radiation damage at the catalytic centre, the precise position of each metal ion remains unknown. To some extent, these problems have been overcome by applying spectroscopic techniques like extended X-ray absorption fine structure. Taking into account the most recent results obtained with these two X-ray-based techniques, we have attempted to refine models of the structure of the Mn₄Ca²⁺ cluster and its protein environment.
Philosophical Transactions: Biological Sciences © 2008 Royal Society