Phosphatidylglycerol depletion induces an increase in myxoxanthophyll biosynthetic activity in Synechocystis PCC6803 cells

Phosphatidylglycerol (PG) depletion suppressed the oxygen-evolving activity of Synechocystis PCC6803 pgsA mutant cells. Shortage of PG led to decreased photosynthetic activity, which, similar to the effect of high light exposure, is likely to generate the production of reactive oxygen species (ROS)...

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Bibliographic Details
Published in:Plant and cell physiology 2009-02, Vol.50 (2), p.374-382
Main Authors: Domonkos, I.(Hungarian Academy of Sciences, Szeged (Hungary)), Malec, P, Laczko-Dobos, H, Sozer, O, Klodawska, K, Wada, H, Strzalka, K, Gombos, Z
Format: Article
Language:English
Subjects:
CAROTENOIDE
CAROTENOIDES
CAROTENOIDS
Carotenoids - biosynthesis
ESPECIES DE OXIGENO REACTIVO
FOSFOLIPIDOS
FOTOSINTESIS
Light
Mutation
Myxoxanthophyll
PG depletion
PHOSPHATIDE
Phosphatidylglycerols - metabolism
PHOSPHOLIPIDS
PHOTOSYNTHESE
PHOTOSYNTHESIS
Protection
REACTIVE OXYGEN SPECIES
SYNECHOCYSTIS
Synechocystis - genetics
Synechocystis - metabolism
SynechocystisPCC6803
Thylakoids - metabolism
Xanthophylls - biosynthesis
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Summary:Phosphatidylglycerol (PG) depletion suppressed the oxygen-evolving activity of Synechocystis PCC6803 pgsA mutant cells. Shortage of PG led to decreased photosynthetic activity, which, similar to the effect of high light exposure, is likely to generate the production of reactive oxygen species (ROS) or free radicals. Protection of the PG-depleted cells against light-induced damage increased the echinenone and myxoxanthophyll content of the cells. The increased carotenoid content was localized in a soluble fraction of the cells as well as in isolated thylakoid and cytoplasmic membranes. The soluble carotenoid fraction contained carotene derivatives, which may bind to proteins. These carotene-protein complexes are similar to orange carotenoid protein that is involved in yielding protection against free radicals and ROS. An increase in the content of myxoxanthophyll and echinenone upon PG depletion suggests that PG depletion regulates the biosynthetic pathway of specific carotenoids.
ISSN:0032-0781
1471-9053
DOI:10.1093/pcp/pcn204