Excitation energy transfer from the bacteriochlorophyll Soret band to carotenoids in the LH2 light-harvesting complex from Ectothiorhodospira haloalkaliphila is negligible
| Autor: | Evgeny P. Lukashev, A. A. Ashikhmin, V. O. Kompanets, Andrei P. Razjivin, V. S. Kozlovsky, Andrey A. Moskalenko, Sergey V. Chekalin, Vladimir Z. Paschenko |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Light-Harvesting Protein Complexes Plant Science Ectothiorhodospira Photochemistry 01 natural sciences Biochemistry Purple bacteria Light-harvesting complex 03 medical and health sciences chemistry.chemical_compound Singlet state Absorption (electromagnetic radiation) Bacteriochlorophylls biology Cell Biology General Medicine biology.organism_classification Carotenoids Fluorescence Spectrometry Fluorescence 030104 developmental biology Energy Transfer chemistry Intramolecular force cardiovascular system lipids (amino acids peptides and proteins) Bacteriochlorophyll Excitation 010606 plant biology & botany |
| Zdroj: | Photosynthesis Research. 133:289-295 |
| ISSN: | 1573-5079 0166-8595 |
| DOI: | 10.1007/s11120-017-0341-7 |
| Popis: | Pathways of intramolecular conversion and intermolecular electronic excitation energy transfer (EET) in the photosynthetic apparatus of purple bacteria remain subject to debate. Here we experimentally tested the possibility of EET from the bacteriochlorophyll (BChl) Soret band to the singlet S2 level of carotenoids using femtosecond pump–probe measurements and steady-state fluorescence excitation and absorption measurements in the near-ultraviolet and visible spectral ranges. The efficiency of EET from the Soret band of BChl to S2 of the carotenoids in light-harvesting complex LH2 from the purple bacterium Ectothiorhodospira haloalkaliphila appeared not to exceed a few percent. |
| Databáze: | OpenAIRE |
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