The inhibitory effects of acidification and augmented oxygen pressure on water oxidation.

Photosynthesis Research
Juergen Clausen, W Junge

Abstract

Cyanobacteria, algae, and plants produce dioxygen from water. Driven and clocked by light quanta, the catalytic Mn(4)Ca Tyrosine centre accumulates four oxidizing equivalents before it abstracts four electrons from water and liberates dioxygen and protons. Intermediates of this reaction cascade are short-lived (<100 micros) and difficult to detect. By application of high oxygen pressure to cyanobacterial PSII-core-complexes, we have previously suppressed the transition from the highest oxidation state of the centre to the lowest by stabilizing a (peroxy) intermediate. Here, we investigated the inhibitory interplay of acidification and augmented oxygen pressure. Starting from pH 6.5, acidification increasingly inhibited the reduction of the highest oxidized state and resulted in a lower oxygen partial pressure for half inhibition. Oxygen and proton interfere with different steps of the reaction cascade.

References

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Jul 23, 2004·Nature·Juergen Clausen, Wolfgang Junge
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Jan 30, 2008·Biochimica Et Biophysica Acta·Alexander N TikhonovBoris V Trubitsin

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Citations

Feb 16, 2011·Proceedings of the National Academy of Sciences of the United States of America·Dmitriy ShevelaJohannes Messinger

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