Manganese and tyrosyl radical function in photosynthetic oxygen evolution

Photosystem II catalyzes the photosynthetic oxidation of water to O 2. The structural and functional basis for this remarkable process is emerging. The catalytic site contains a tetramanganese cluster, calcium, chloride and a redox-active tyrosine organized so as to promote electroneutral hydrogen a...

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Bibliographic Details
Published in:Current opinion in chemical biology 1998-04, Vol.2 (2), p.244-252
Main Authors: Tommos, Cecilia, Hoganson, Curtis W, Di Valentin, Marilena, Lydakis-Simantiris, Nikos, Dorlet, Pierre, Westphal, Kristi, Chu, Hsiu-An, McCracken, John, Babcock, Gerald T
Format: Article
Language:English
Subjects:
Binding Sites
Chlorophyll - chemistry
Free Radicals - metabolism
Light
Light-Harvesting Protein Complexes
Manganese - chemistry
Oxygen - metabolism
Photosynthesis - physiology
Photosynthetic Reaction Center Complex Proteins - chemistry
Photosystem II Protein Complex
Tyrosine - chemistry
Water - metabolism
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Summary:Photosystem II catalyzes the photosynthetic oxidation of water to O 2. The structural and functional basis for this remarkable process is emerging. The catalytic site contains a tetramanganese cluster, calcium, chloride and a redox-active tyrosine organized so as to promote electroneutral hydrogen atom abstraction from manganese-bound substrate water by the tyrosyl radical. Recent work is assessed within the framework of this model for the water oxidizing process.
ISSN:1367-5931
1879-0402
DOI:10.1016/S1367-5931(98)80066-5