Extended Data Fig. 4: Movement of ligands around the OEC in the different S states.
From: Structures of the intermediates of Kok’s photosynthetic water oxidation clock
a, Overview of the ligand environment of the OEC, showing the dark state (0F) structure. Coordination of the OEC by nearby side chains and water molecules is indicated by dashed lines. b–g, Trends for selected individual side chains in both monomers (b–d, monomer A; e–g, monomer a). Overlays of the refined models at the OEC following least-squares fitting of subunit D1 residues 55–65, 160–190 and 328, subunit CP43 residues 328 and 354–358, and chain D residue 352 of each other model to the 0F model. The largest and most consistent motions of side chains near the OEC through the sequence of illuminated state models are annotated with arrows indicating the trend. A motion observed in only one monomer is indicated by a dashed line.
