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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Deák, Zsuzsanna Kiss, Eva Sass, László Vass, Imre |
| Description | Author Affiliation: Deák Z ( Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, Temesvari krt. 62, 6726 Szeged, Hungary.); Sass L ( Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, Temesvari krt. 62, 6726 Szeged, Hungary.); Kiss E ( Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, Temesvari krt. 62, 6726 Szeged, Hungary.); Vass I ( Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, Temesvari krt. 62, 6726 Szeged, Hungary. Electronic address: vass.imre@brc.mta.hu.) |
| Abstract | Fluorescence yield relaxation following a light pulse was studied in various cyanobacteria under aerobic and microaerobic conditions. In Synechocystis PCC 6803 fluorescence yield decays in a monotonous fashion under aerobic conditions. However, under microaerobic conditions the decay exhibits a wave feature showing a dip at 30–50 ms after the flash followed by a transient rise, reaching maximum at ~ 1 s, before decaying back to the initial level. The wave phenomenon can also be observed under aerobic conditions in cells preilluminated with continuous light. Illumination preconditions cells for the wave phenomenon transiently: for few seconds in Synechocystis PCC 6803, but up to one hour in Thermosynechocystis elongatus BP-1. The wave is eliminated by inhibition of plastoquinone binding either to the Q $_{B}$ site of Photosystem-II or the Q $_{o}$ site of cytochrome b $_{6}$ f complex by 3-(3′,4′-dichlorophenyl)-1,1-dimethylurea or 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone, respectively. The wave is also absent in mutants, which lack either Photosystem-I or the NAD(P)H-quinone oxidoreductase (NDH-1) complex. Monitoring the redox state of the plastoquinone pool revealed that the dip of the fluorescence wave corresponds to transient oxidation, whereas the following rise to re-reduction of the plastoquinone pool. It is concluded that the unusual wave feature of fluorescence yield relaxation reflects transient oxidation of highly reduced plastoquinone pool by Photosystem-I followed by its re-reduction from stromal components via the NDH-1 complex, which is transmitted back to the fluorescence yield modulator primary quinone electron acceptor via charge equilibria. Potential applications of the wave phenomenon in studying photosynthetic and respiratory electron transport are discussed. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: Keys to Produce Clean Energy. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 9 |
| Volume Number | 1837 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-09-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Chlorophyll Chemistry Cyanobacteria Metabolism Electron Transport NAD(P)H Dehydrogenase (Quinone) Physiology Photosystem II Protein Complex Plastoquinone Synechocystis Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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