Abstract
This mini-review briefly summarizes our current knowledge on the reaction pattern of light-driven water splitting and the structure of Photosystem II that acts as a water:plastoquinone oxidoreductase. The overall process comprises three types of reaction sequences: (a) light-induced charge separation leading to formation of the radical ion pair P680+•Q −•A ; (b) reduction of plastoquinone to plastoquinol at the QB site via a two-step reaction sequence with Q −•A as reductant and (c) oxidative water splitting into O2 and four protons at a manganese-containing catalytic site via a four-step sequence driven by P680+• as oxidant and a redox active tyrosine YZ acting as mediator. Based on recent progress in X-ray diffraction crystallographic structure analysis the array of the cofactors within the protein matrix is discussed in relation to the functional pattern. Special emphasis is paid on the structure of the catalytic sites of PQH2 formation (QB-site) and oxidative water splitting (Mn4O x Ca cluster). The energetics and kinetics of the reactions taking place at these sites are presented only in a very concise manner with reference to recent up-to-date reviews. It is illustrated that several questions on the mechanism of oxidative water splitting and the structure of the catalytic sites are far from being satisfactorily answered.
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Abbreviations
- BChl:
-
Bacteriochlorophyl
- BPheo:
-
Bacteriopheophytin
- Chl:
-
Chlorophyll
- EET:
-
Excited state energy transfer
- ENDOR:
-
Electron nuclear double resonance
- EPR:
-
Electron paramagnetic resonance
- ESEEM:
-
Electron spin echo envelope modulation
- ET:
-
Electron transfer
- EXAFS:
-
Extended X-ray absorption fine structure
- FTIR:
-
Fourier transform infra red
- MGDG:
-
Monogalactosyldiacylglycerol
- NHFe:
-
Nonheme iron
- PBRC :
-
Purple bacterial reaction center
- PG:
-
Phosphatidylglycerol
- Pheo:
-
Pheophytin
- PQ:
-
Plastoquinone
- PS I:
-
Photosystem I
- PS II:
-
Photosystem II
- QENS:
-
Quasielastic neutron scattering
- RC:
-
Reaction center
- RP:
-
Radical pair
- SQDG:
-
Sulfoquinovosyldiacylglycerol
- TMH:
-
Transmembrane helix
- UQ:
-
Ubiquinone
- WOC:
-
Water-oxidizing complex
- XANES:
-
X-ray absorption near edge spectroscopy
- XRDC:
-
X-ray diffraction crystallography
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Acknowledgement
The authors would like to thank A. Zouni, B. Loll, J. Biesiadka and W. Saenger for helpful discussions regarding the PSII structure, S. Renger and P. Kühn for preparing the electronic versions of Fig. 2 and Figs. 4 and 7, respectively. The support by DFG-Sonderforschungsbereich 429, TP A1 (GR) and 498, TP C7 (JK) is gratefully acknowledged.
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Kern, J., Renger, G. Photosystem II: Structure and mechanism of the water:plastoquinone oxidoreductase. Photosynth Res 94, 183–202 (2007). https://doi.org/10.1007/s11120-007-9201-1
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DOI: https://doi.org/10.1007/s11120-007-9201-1