Calcium in the oxygen-evolving complex: structural and mechanistic role determined by X-ray spectroscopy.

Junko Yano, Vittal K Yachandra

Journal: Journal of photochemistry and photobiology. B, Biology 2011;104(1-2):51-9

PMID: 21524917

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Abstract

This review describes the results from X-ray Absorption Spectroscopy studies that have contributed to an understanding of the role of Ca in the photosynthetic water-oxidation reaction. The results include the first Mn, Ca and Sr X-ray spectroscopy studies using Ca or Sr-substituted PS II samples that established the presence of a MnCa heteronuclear structure and its orientation, and the most recent Sr X-ray spectroscopy study using biosynthetically prepared Sr-containing PS II in the various S-states that provide important insights into the requirement for Ca in the mechanism of the Mn(4)Ca catalytic center.

Address: Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. [email protected]

DOI: 10.1016/j.jphotobiol.2011.02.019

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MeSH Terms: Calcium, Catalytic Domain, Oxygen, Photosystem II Protein Complex, X-Ray Absorption Spectroscopy