Evidence that D1-His332 in Photosystem II from Thermosynechococcus elongatus Interacts with the S 3 -State and not with the S 2 -State
Oxygen evolution by Photosystem II (PSII) is catalyzed by a Mn 4Ca cluster. Thus far, from the crystallographic three-dimensional (3D) structures, seven amino acid residues have been identified as possible ligands of the Mn4Ca cluster. Among them, there is only one histidine, His332, which belongs to the D1 polypeptide. The relationships of the D1-His332 amino acid with kinetics and thermodynamic properties of the Mn 4Ca cluster in the S2- and S3-states of the catalytic cycle were investigated...[Show more]
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