Reaction pattern of Photosystem II: oxidative water cleavage and protein flexibility
| Autor: | O. P. Kaminskaya, H.-J. Eckert, Vladimir A. Shuvalov, Philipp Kühn, Jörg Pieper, Gernot Renger, Ruep E. Lechner |
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| Rok vydání: | 2005 |
| Předmět: |
Light
Photosystem II Protein Conformation Kinetics Cytochrome b559 Protonation Plant Science Cyanobacteria Photochemistry Cleavage (embryo) Biochemistry Bacterial Proteins Spinacia oleracea Photosynthesis Plant Proteins Chemistry Temperature Oxygen evolution Photosystem II Protein Complex Water P680 Cell Biology General Medicine Oxygen Quasielastic neutron scattering Protons Oxidation-Reduction |
| Zdroj: | Photosynthesis Research. 84:317-323 |
| ISSN: | 1573-5079 0166-8595 |
| DOI: | 10.1007/s11120-004-7079-8 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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