Oct 3, 2008

Photosystem II: The machinery of photosynthetic water splitting

Photosynthesis Research
Gernot Renger, Thomas Renger

Abstract

This review summarizes our current state of knowledge on the structural organization and functional pattern of photosynthetic water splitting in the multimeric Photosystem II (PS II) complex, which acts as a light-driven water: plastoquinone-oxidoreductase. The overall process comprises three types of reaction sequences: (1) photon absorption and excited singlet state trapping by charge separation leading to the ion radical pair [Formula: see text] formation, (2) oxidative water splitting into four protons and molecular dioxygen at the water oxidizing complex (WOC) with P680+* as driving force and tyrosine Y(Z) as intermediary redox carrier, and (3) reduction of plastoquinone to plastoquinol at the special Q(B) binding site with Q(A)-* acting as reductant. Based on recent progress in structure analysis and using new theoretical approaches the mechanism of reaction sequence (1) is discussed with special emphasis on the excited energy transfer pathways and the sequence of charge transfer steps: [Formula: see text] where (1)(RC-PC)* denotes the excited singlet state (1)P680* of the reaction centre pigment complex. The structure of the catalytic Mn(4)O(X)Ca cluster of the WOC and the four step reaction sequence leading to oxidative...Continue Reading

  • References155
  • Citations131

References

  • References155
  • Citations131

Citations

Mentioned in this Paper

Plastoquinol
Biochemical Pathway
Dioxygen
Energy Transfer
Singlet
Oxidation
Light
Ligand Binding Domain
Morphogenesis
Reaction Center

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