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The basic properties of the electronic structure of the oxygen-evolving complex of photosystem II are not perturbed by Ca 2+ removal

Lohmiller, Thomas; Cox, Nicholas; Su, Ji-Hu; Messinger, Johannes; Lubitz, Wolfgang


Ca2+ is an integral component of the Mn4O5Ca cluster of the oxygen-evolving complex in photosystem II (PS II). Its removal leads to the loss of the water oxidizing functionality. The S2′ state of the Ca2+-depleted cluster from spinach is examined by X- and Q-band EPR and 55Mn electron nuclear double resonance (ENDOR) spectroscopy. Spectral simulations demonstrate that upon Ca2+ removal, its electronic structure remains essentially unaltered, i.e. that of a manganese tetramer. No redistribution...[Show more]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
Source: Journal of Biological Chemistry
DOI: 10.1074/jbc.M112.365288
Access Rights: Open Access


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