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. Author manuscript; available in PMC: 2013 Apr 3.
Published in final edited form as: Curr Opin Chem Biol. 2012 Apr 3;16(1-2):11–18. doi: 10.1016/j.cbpa.2012.03.003

Fig 1.

Fig 1

The oxygen-evolving complex (OEC) of Photosystem II (PSII). Top panel: ligation scheme of the Mn4O5Ca cluster and chloride binding sites (BS1 and BS2) as proposed by the X-ray model at 1.9 Å resolution. Carboxylate groups of amino-acid residues in close contact with the OEC, including D1-Asp61, D1-Asp170 and D1-Glu189 that might be essential for proton-transfer events along the catalytic cycle of water oxidation are highlighted. Bottom panel: Superposition of the OEC in the X-ray models of PSII at 1.9 Å (blue) and 3.5 Å (red) resolution. Bottom part reproduced from Ref. 28**.