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• W2019425438 abstract "The functional role of the Ca2+ ion in the oxygen-evolving complex of photosystem II is not yet clear. Current models explain why the redox cycle of the complex would be interrupted after the S3 state without Ca2+, but the literature shows that it is interrupted after the S2 state. Reinterpretation of the literature on methods of Ca2+ depletion [Miqyass, M., van Gorkom, H. J., and Yocum, C. F. (2007) Photosynth. Res. 92, 275−287] led us to propose that all S-state transitions require Ca2+. Here we confirm that interpretation by measurements of flash-induced S-state transitions in UV absorbance. The results are explained by a cation exchange at the Ca2+ binding site that, in the absence of the extrinsic PsbP and PsbQ polypeptides, can occur in minutes in low S-states and in seconds in high S-states, depending on the concentration of the substituting cation. In the S2(K+) or S2(Na+) state a slow conformational change occurs that prevents recovery of the slow-exchange situation on return to a lower S-state but does not inhibit the S-state cycle in the presence of Ca2+. The ratio of binding affinities for monovalent vs divalent cations increases dramatically in the higher S-states. With the possible exception of S0 to S1, all S-state transitions specifically require Ca2+, suggesting that Ca2+-bound H2O plays an essential role in a H+ transfer network required for H+-coupled electron transfer from the Mn cluster to tyrosine Z." @default.
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• W2019425438 date "2008-07-01" @default.
• W2019425438 modified "2023-10-10" @default.
• W2019425438 title "S-State Dependence of the Calcium Requirement and Binding Characteristics in the Oxygen-Evolving Complex of Photosystem II" @default.
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• W2019425438 doi "https://doi.org/10.1021/bi8006059" @default.
• W2019425438 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18593200" @default.
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