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Evidence for a Direct Manganese-Oxygen Ligand in Water Binding to the S 2 State of the Photosynthetic Water Oxidation Complex

Evans, M C W; Nugent, J H A; Ball, R J; Muhiuddin, I; Pace, Ronald


The interaction of water with the water oxidizing Mn complex of photosystem II has been investigated using electron spin-echo envelope modulation spectroscopy in the presence of H217O. The spectra show interaction of the 17O with the preparation in the S2 state induced by 200 K illumination. The modulation is observed only in the center of the multiline spectrum. The inferred hyperfine coupling terms are compatible with water (not hydroxyl) oxygen bound to a particular quasi-axial MnIII center...[Show more]

CollectionsANU Research Publications
Date published: 2004
Type: Journal article
Source: Biochemistry


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