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The oxygen-evolving complex , also known as the water-splitting complex, is the portion of photosystem II where photo-oxidation of water occurs during the light reactions of photosynthesis. The OEC is surrounded by four core protein subunits of photosystem II at the membrane-lumen interface.
In the overall water oxidation reaction, four electrons are extracted from two water molecules so that four protons and one O2 molecule are produced. The molecular machinery for oxidizing water requires the ability to store the oxidizing potential resulting from three light-induced charge separations before the fourth provides sufficient oxidizing power for water oxidation.
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