PMID: 11607120Dec 1, 1990Paper

Evidence for a biological role in photosynthesis for cytochrome b-559--a component of photosystem II reaction center

Proceedings of the National Academy of Sciences of the United States of America
O Canaani, M Havaux

Abstract

Absorbance changes in untreated intact leaf discs, produced upon excitation with high-intensity red light, were shown to be due to the photooxidation of cytochrome b-559. At low intensities (<100 W/m2), photooxidation was almost undetectable. Photooxidation occurred with a half-time of 4.3 sec and an extent of 0.64 mol of cytochrome per 320 mol of chlorophyll. Upon transition to darkness, an additional oxidation occurred that exhibited faster kinetics (t/12 < 100 msec) and 0.32 mol of cytochrome was oxidized per 320 mol of chlorophyll. Photooxidation was inhibited by 3-(3,4-dichlorophenyl)-1,1-dimethylurea and was specifically induced by red light since far-red light did not cause any absorbance decrease. These results suggest that the redox changes of cytochrome b-559 are driven by photosystem II. Photooxidation was increased by 67% and its initial rate was doubled upon incubation of the leaf in carbonylcyanide p-trifluoromethoxy-phenylhydrazone. Exposure of the leaf to mild water stress or mild heat stress resulted in an increase in the extent of photooxidation and in a 6-fold decrease in the rate constant. Mild heat stress also induced a large increase of the rate constant for the dark reduction of the cytochrome. The depend...Continue Reading

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Citations

Jun 1, 1996·Photosynthesis Research·O PrasilP G Falkowski
Sep 22, 2007·Journal of Bioenergetics and Biomembranes·Arjun TiwariSudhakar Bharti
May 20, 2003·European Journal of Biochemistry·Inmaculada YruelaRafael Picorel
Sep 1, 1992·Proceedings of the National Academy of Sciences of the United States of America·L NedbalJ Whitmarsh
Oct 9, 2015·European Biophysics Journal : EBJ·Olga P Kaminskaya, Vladimir A Shuvalov
May 7, 2014·Journal of Photochemistry and Photobiology. B, Biology·Sonal MathurAnjana Jajoo
Jun 7, 2013·Metallomics : Integrated Biometal Science·Inmaculada Yruela
Oct 1, 2018·Biochimica Et Biophysica Acta. Bioenergetics·Olga P Kaminskaya, Vladimir A Shuvalov

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