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| Content Provider | Springer Nature Link |
|---|---|
| Author | Chamorovsky, Sergei K. Kx, Peter P. Chizhov, Igor V. Zubov, Boris V. |
| Copyright Year | 2003 |
| Abstract | Methods of laser-induced temperature jumps and fast freezing were used for testing the rates of thermoinduced conformational transitions of reaction center (RC) complexes in chromatophores and isolated RC preparations of various photosynthesizing purple bacteria. An electron transfer reaction from primary to secondary quinone acceptors was used as a probe of electron transport efficiency. The thermoinduced transition of the acceptor complex to the conformational state facilitating electron transfer to the secondary quinone acceptor was studied. To investigate the dynamics of spontaneous decay of the RC state induced by the thermal pulse, the thermal pulse was applied either before or during photoinduced activation of electron transport reactions in the RC acceptor complex. The maximum effect was observed if the thermal pulse was applied against the background of steady-state photoactivation of the RC. It was shown that neither the characteristic time of the thermoinduced transition within the temperature range 233–253 K nor the characteristic time of spontaneous decay of this state at 253 K exceeded several tens of milliseconds. Independent support of the estimates was obtained from experiments with varied cooling rates of the samples tested. |
| Starting Page | 537 |
| Ending Page | 543 |
| Page Count | 7 |
| File Format | |
| ISSN | 01757571 |
| Journal | European Biophysics Journal |
| Volume Number | 32 |
| Issue Number | 6 |
| e-ISSN | 14321017 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2003-03-18 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Conformational changes Cytochromes Electron transport Photosynthetic reaction center Purple bacteria |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Biophysics |
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