Structure of the Mn4–Ca cluster as derived from X-ray diffraction

Kern, Jana; Biesiadka, Jacek; Loll, Bernhard; Saenger, Wolfram; Zouni, Athina

doi:10.1007/s11120-007-9173-1

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Structure of the Mn4–Ca cluster as derived from X-ray diffraction

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Kern, Jana
Department of Biomedical Optics, Max Planck Institute for Medical Research, Max Planck Society;

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Loll, Bernhard
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Kern, J., Biesiadka, J., Loll, B., Saenger, W., & Zouni, A. (2007). Structure of the Mn4–Ca cluster as derived from X-ray diffraction. Photosynthesis Research, 92(3), 389-405. doi:10.1007/s11120-007-9173-1.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-A88B-9

Abstract

The catalytic centre for light-induced water oxidation in photosystem II (PSII) is a multinuclear metal cluster containing four manganese and one calcium cations. Knowing the structure of this biological catalyst is of utmost importance for unravelling the mechanism of water oxidation in photosynthesis. In this review we describe the current state of the X-ray structure determination at 3.0 A resolution of the water oxidation complex (WOC) of PSII. The arrangement of metal cations in the cluster, their coordination and protein surroundings are discussed with regard to spectroscopic and mutagenesis studies. Limitations of the presently available structural data are pointed out and possible perspectives for the future are outlined, including the combination of X-ray diffraction and X-ray spectroscopy on single crystals.