Article (Scientific journals)
Alternative photosynthetic electron flow to oxygen in marine Synechococcus.
Bailey, Shaun; Melis, Anastasios; Mackey, Katherine R M et al.
2008In Biochimica et Biophysica Acta, 1777 (3), p. 269-76
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Keywords :
Adaptation, Physiological; Chlorophyll/metabolism; Electron Transport; Enzyme Inhibitors/pharmacology; Iron/deficiency/metabolism; Oxidation-Reduction; Oxidoreductases/antagonists & inhibitors/metabolism; Oxygen/metabolism; Photosynthesis; Photosystem I Protein Complex/metabolism; Photosystem II Protein Complex/metabolism; Propyl Gallate/pharmacology; Seawater/chemistry; Synechococcus/drug effects/enzymology/metabolism/radiation effects; Thylakoids/drug effects/enzymology/metabolism/radiation effects; Time Factors
Abstract :
[en] Cyanobacteria dominate the world's oceans where iron is often barely detectable. One manifestation of low iron adaptation in the oligotrophic marine environment is a decrease in levels of iron-rich photosynthetic components, including the reaction center of photosystem I and the cytochrome b6f complex [R.F. Strzepek and P.J. Harrison, Photosynthetic architecture differs in coastal and oceanic diatoms, Nature 431 (2004) 689-692.]. These thylakoid membrane components have well characterised roles in linear and cyclic photosynthetic electron transport and their low abundance creates potential impediments to photosynthetic function. Here we show that the marine cyanobacterium Synechococcus WH8102 exhibits significant alternative electron flow to O2, a potential adaptation to the low iron environment in oligotrophic oceans. This alternative electron flow appears to extract electrons from the intersystem electron transport chain, prior to photosystem I. Inhibitor studies demonstrate that a propyl gallate-sensitive oxidase mediates this flow of electrons to oxygen, which in turn alleviates excessive photosystem II excitation pressure that can often occur even at relatively low irradiance. These findings are also discussed in the context of satisfying the energetic requirements of the cell when photosystem I abundance is low.
Disciplines :
Biochemistry, biophysics & molecular biology
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Bailey, Shaun
Melis, Anastasios
Mackey, Katherine R M
Cardol, Pierre  ;  Université de Liège - ULiège > Département des sciences de la vie > Génétique
Finazzi, Giovanni
van Dijken, Gert
Berg, Gry Mine
Arrigo, Kevin
Shrager, Jeff
Grossman, Arthur
Language :
English
Title :
Alternative photosynthetic electron flow to oxygen in marine Synechococcus.
Alternative titles :
[fr] Flux alternatif d'électrons à l'oxygène chez l'algue marine Synechococcus
Publication date :
2008
Journal title :
Biochimica et Biophysica Acta
ISSN :
0006-3002
eISSN :
1878-2434
Publisher :
Elsevier, Amsterdam, Netherlands
Volume :
1777
Issue :
3
Pages :
269-76
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 May 2010

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