Alternative photosynthetic electron flow to oxygen in marine Synechococcus
| Autor: | Gert L. van Dijken, Katherine R. M. Mackey, Giovanni Finazzi, Arthur R. Grossman, Shaun Bailey, Kevin R. Arrigo, Anastasios Melis, Jeff Shrager, Pierre Cardol, Gry Mine Berg |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
0106 biological sciences
Photosynthetic reaction centre Chlorophyll Photoinhibition Time Factors Photosystem II Iron Biophysics Alternative electron transport Biology Photosystem I Photosynthesis Cyanobacteria 01 natural sciences Biochemistry Thylakoids 03 medical and health sciences Botany Physical Sciences and Mathematics Propyl Gallate Seawater 14. Life underwater Enzyme Inhibitors 030304 developmental biology Photosystem Synechococcus 0303 health sciences Photosystem I Protein Complex Cytochrome b6f complex Electron transport fungi Photosystem II Protein Complex Cell Biology Iron Deficiencies biology.organism_classification Adaptation Physiological Oxygen Synechococcus WH80102 13. Climate action Oxidoreductases Oxidase Oxidation-Reduction 010606 plant biology & botany |
| Zdroj: | Bailey, S; Melis, A; Mackey, KRM; Cardol, P; Finazzi, G; van Dijken, G; et al.(2008). Alternative photosynthetic electron flow to oxygen in marine Synechococcus. Biochimica et Biophysica Acta-Bioenergetics, 1777(3), 269-276. doi: 10.1016/j.bbabio.2008.01.002. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/9ms1v4k7 Bailey, Shaun; Melis, Anastasios; Mackey, Katherine R.M.; Cardol, Pierre; Finazzi, Giovanni; van Dijken, Gert; et al.(2008). Alternative photosynthetic electron flow to oxygen in marine Synechococcus. Biochimica et Biophysica Acta (BBA)-Bioenergetics, 1777(3), 269-276. doi: 10.1016/j.bbabio.2008.01.002. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/0vc1k5s7 |
| DOI: | 10.1016/j.bbabio.2008.01.002. |
| Popis: | 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. © 2008 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|