Abstract
This short communication addresses three topics of photosynthetic water cleavage in Photosystem II (PS II): (a) effect of protonation in the acidic range on the extent of the ‘fast’ ns kinetics of P680+· reduction by Y Z , (b) mechanism of O–O bond formation and (c) role of protein flexibility in the functional integrity of PS II. Based on measurements of light-induced absorption changes and quasielastic neutron scattering in combination with mechanistic considerations, evidence is presented for the protein acting as a functionally active constituent of the water cleavage machinery, in particular, for directed local proton transfer. A specific flexibility emerging above a threshold of about 230 K is an indispensable prerequisite for oxygen evolution and plastoquinol formation.
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Kühn, P., Pieper, J., Kaminskaya, O. et al. Reaction pattern of Photosystem II: oxidative water cleavage and protein flexibility. Photosynth Res 84, 317–323 (2005). https://doi.org/10.1007/s11120-004-7079-8
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DOI: https://doi.org/10.1007/s11120-004-7079-8