Mar 6, 2012

Recent developments in research on water oxidation by photosystem II

Current Opinion in Chemical Biology
Holger DauM Haumann


Photosynthetic water oxidation chemistry at the unique manganese-calcium complex of photosystem II (PSII) is of fundamental importance and serves as a paragon in the development of efficient synthetic catalysts. A recent crystal structure of PSII shows the atoms of the water-oxidizing complex; its Mn4CaO5 core resembles inorganic manganese-calcium oxides. Merging of crystallographic and spectroscopic information reverses radiation-induced modifications at the Mn-complex in silico and facilitates discussion of the O-O bond chemistry. Coordinated proton movements are promoted by a water network connecting the Mn4CaO5 core with the oxidant, a tyrosine radical and one possibly mobile chloride ion. A basic reaction-cycle model predicts an alternating proton and electron removal from the catalytic site, which facilitates energetically efficient water oxidation.

Mentioned in this Paper

Carbohydrate nutrients
Amino Acids, I.V. solution additive
Plain X-ray
Electron Transport
Radiographic Imaging Procedure
Hydrogen Bonding

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