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Phosphatidylglycerol Depletion Induces an Increase in Myxoxanthophyll Biosynthetic Activity in Synechocystis PCC6803 Cells |
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| Authors: | Domonkos, Ildiko Malec, Przemyslaw Laczko-Dobos, Hajnalka Sozer, Ozge Klodawska, Kinga Wada, Hajime Strzalka, Kazimierz Gombos, Zoltan |
| Affiliation: | 1Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, H-6701 Szeged, Hungary 2Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, PL-30-387 Krakow, Poland 3Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba, Tokyo, 153-8902 Japan |
| Abstract: | Phosphatidylglycerol (PG) depletion suppressed the oxygen-evolvingactivity of Synechocystis PCC6803 pgsA mutant cells. Shortageof PG led to decreased photosynthetic activity, which, similarto the effect of high light exposure, is likely to generatethe production of reactive oxygen species (ROS) or free radicals.Protection of the PG-depleted cells against light-induced damageincreased the echinenone and myxoxanthophyll content of thecells. The increased carotenoid content was localized in a solublefraction of the cells as well as in isolated thylakoid and cytoplasmicmembranes. The soluble carotenoid fraction contained carotenederivatives, which may bind to proteins. These carotene–proteincomplexes are similar to orange carotenoid protein that is involvedin yielding protection against free radicals and ROS. An increasein the content of myxoxanthophyll and echinenone upon PG depletionsuggests that PG depletion regulates the biosynthetic pathwayof specific carotenoids. |
| Keywords: | Carotenoids - Myxoxanthophyll - PG depletion - Photosynthesis - Protection - SynechocystisPCC6803 |
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