Abstract
The main function of Photosystem II in chloroplast is to oxidize water molecules to produce oxygen. Strong oxidant produced by photoreaction at Photosystem II reaction center derives electrons from water and the electrons are transferred via Photosystem I to NADP+. The components required for water oxidation in Photosystem II were identified and their molecular properties as well as their roles in the oxygen evolution process were elucidated. The entity of the oxygen evolution system is a supramolecular complex of Photosystem II in the thylakoid membrane where reaction center binding polypeptides, three extrinsic polypeptides, managenese atoms, Ca2+ and Cl− ions are the essential components, and they constitute a specific catalytic domain for water oxidation.
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