(18)O isotope exchange measurements reveal that calcium is involved in the binding of one substrate-water molecule to the oxygen-evolving complex in photosystem II.

Abstract

Direct evidence is presented to show that calcium is inherently involved in the binding of one of the two substrate-water molecules to the oxygen-evolving complex in photosystem II. Previous rapid (millisecond range) (18)O isotope exchange measurements between added H(2)(18)O and the photogenerated O(2) have shown that the two substrate-water molecules bind… (More)

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