Non-photochemical quenching of fluorescence in cyanobacteria |
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Authors: | N V Karapetyan |
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Institution: | (1) Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky pr. 33, 119071 Moscow, Russia |
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Abstract: | The pathways of energy dissipation of excessive absorbed energy in cyanobacteria in comparison with that in higher plants
are discussed. Two mechanisms of non-photochemical quenching in cyanobacteria are described. In one case this quenching occurs
as light-induced decrease of the fluorescence yield of long-wavelength chlorophylls of the photosystem I trimers induced by
inactive reaction centers: P700 cation-radical or P700 in triplet state. In the other case, non-photochemical quenching in
cyanobacteria takes place with contribution of water-soluble protein OCP (containing 3′-hydroxyechinenone) that induces reversible
quenching of allophycocyanin fluorescence in phycobilisomes. The possible evolutionary pathways of the involvement of carotenoid-binding
proteins in non-photochemical quenching are discussed comparing the cyanobacterial OCP and plant PsbS protein.
Published in Russian in Biokhimiya, 2007, Vol. 72, No. 10, pp. 1385–1395. |
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Keywords: | allophycocyanin cyanobacteria 3′ -hydroxyechinenone light-harvesting complex LHCII non-photochemical quenching orange carotenoid-binding protein phycobilisome |
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