Differences in the Active Site of Water Oxidation among Photosynthetic Organisms

Retegan, Marius; Pantazis, Dimitrios A.

doi:10.1021/jacs.7b06351

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Differences in the Active Site of Water Oxidation among Photosynthetic Organisms

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Pantazis, Dimitrios A.
Research Department Neese, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Retegan, M., & Pantazis, D. A. (2017). Differences in the Active Site of Water Oxidation among Photosynthetic Organisms. Journal of the American Chemical Society, 139(41), 14340-14343. doi:10.1021/jacs.7b06351.

Cite as: https://hdl.handle.net/21.11116/0000-0007-3116-9

Abstract

The site of biological water oxidation is highly conserved across photosynthetic organisms, but differences of unidentified structural and electronic origin exist between taxonomically discrete clades, revealed by distinct spectroscopic signatures of the oxygen-evolving Mn₄CaO₅ cluster and variations in active-site accessibility. Comparison of atomistic models of a native cyanobacterial form (Thermosynechococcus vulcanus) and a chimeric spinach-like form of photosystem II allows us to identify the precise atomic-level differences between organisms in the vicinity of the manganese cluster. Substitution of cyanobacterial D1-Asn87 by higher-plant D1-Ala87 is the principal discriminating feature: it drastically rearranges a network of proximal hydrogen bonds, modifying the local architecture of a water channel and the interaction of second coordination shell residues with the manganese cluster. The two variants explain species-dependent differences in spectroscopic properties and in the interaction of substrate analogues with the oxygen-evolving complex, enabling assignment of a substrate delivery channel to the active site.