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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Schansker, Gert Kovács, László Garab, Gyözö Tóth, Szilvia Z. Holzwarth, Alfred R. |
| Description | Author Affiliation: Schansker G ( Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, H-6701 Szeged, Hungary. gert.schansker@gmail.com) |
| Abstract | Experiments were carried out to identify a process co-determining with Q $_{A}$ the fluorescence rise between F $_{0}$ and F $_{M}$ . With 3-(3′,4′-dichlorophenyl)-1,1-dimethylurea (DCMU), the fluorescence rise is sigmoidal, in its absence it is not. Lowering the temperature to − 10 °C the sigmoidicity is lost. It is shown that the sigmoidicity is due to the kinetic overlap between the reduction kinetics of Q $_{A}$ and a second process; an overlap that disappears at low temperature because the temperature dependences of the two processes differ. This second process can still relax at − 60 °C where recombination between Q $_{A}^{−}$ and the donor side of photosystem (PS) II is blocked. This suggests that it is not a redox reaction but a conformational change can explain the data. Without DCMU, a reduced photosynthetic electron transport chain (ETC) is a pre-condition for reaching the F $_{M}$ . About 40% of the variable fluorescence relaxes in 100 ms. Re-induction while the ETC is still reduced takes a few ms and this is a photochemical process. The fact that the process can relax and be re-induced in the absence of changes in the redox state of the plastoquinone (PQ) pool implies that it is unrelated to the Q $_{B}$ -occupancy state and PQ-pool quenching. In both +/−DCMU the process studied represents ~ 30% of the fluorescence rise. The presented observations are best described within a conformational protein relaxation concept. In untreated leaves we assume that conformational changes are only induced when Q $_{A}$ is reduced and relax rapidly on re-oxidation. This would explain the relationship between the fluorescence rise and the ETC-reduction. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 9 |
| Volume Number | 1807 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2011-09-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Chlorophyll Chemistry Photosystem II Protein Complex Fluorescence Protein Conformation Temperature Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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