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

Hendry, G; Wydrzynski, Thomas

Description

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) 18O isotope exchange measurements between added H218O and the photogenerated O2 have shown that the two substrate-water molecules bind to separate sites throughout the S-state cycle, as revealed by their kinetically distinct rates of 18O exchange [Hillier, W., and Wydrzynski, T....[Show more]

CollectionsANU Research Publications
Date published: 2003
Type: Journal article
URI: http://hdl.handle.net/1885/86534
Source: Biochemistry
DOI: 10.1021/bi034279i

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