Photosystem II and photosynthetic oxidation of water: an overview.
Conceptually, photosystem II, the oxygen-evolving enzyme, can be divided into two parts: the photochemical part and the catalytic part. The photochemical part contains the ultra-fast and ultra-efficient light-induced charge separation and stabilization steps that occur when light is absorbed by chlorophyll. The catalytic part, where water is oxidized, involves a cluster of Mn ions close to a redox-active tyrosine residue. Our current understanding of the catalytic mechanism is mainly based on spectroscopic studies. Here, we present an overview of the current state of knowledge of photosystem II, attempting to delineate the open questions and the directions of current research.
Goussias
Charilaos
C
Service de Bioénergétique, URA CNRS 2096, Bat 532, CEA Saclay, 91191 Gif-sur-Yvette, France.
Boussac
Alain
A
Rutherford
A William
AW
D002384:Catalysis; D004578:Electron Spin Resonance Spectroscopy; D007700:Kinetics; D045342:Light-Harvesting Protein Complexes; D008345:Manganese / Q000737:chemistry / Q000378:metabolism; D010084:Oxidation-Reduction; D010788:Photosynthesis; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry / Q000378:metabolism*; D045332:Photosystem II Protein Complex; D011487:Protein Conformation; D014867:Water / Q000378:metabolism*
D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D014867:Water; D008345:Manganese