A New Pathway for Transmembrane Electron Transfer in Photosynthetic Reaction Centers of Rhodobacter sphaeroides Not Involving the Excited Special Pair
| Autor: | M. R. Jones, F. van Mourik, I.H.M. van Stokkum, M. E. van Brederode, R. van Grondelle |
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| Přispěvatelé: | Biophysics Photosynthesis/Energy, Physical Computer Science |
| Rok vydání: | 1997 |
| Předmět: |
Models
Molecular Photosynthetic reaction centre biology Lasers Spectrophotometry Atomic Cell Membrane Photosynthetic Reaction Center Complex Proteins Light-Harvesting Protein Complexes Rhodobacter sphaeroides biology.organism_classification Photosynthesis Photochemistry Biochemistry Electron Transport Transduction (biophysics) chemistry.chemical_compound Electron transfer chemistry Excited state SDG 7 - Affordable and Clean Energy Bacteriochlorophyll Singlet state Bacteriochlorophylls |
| Zdroj: | van Brederode, M E, Jones, M R, van Mourik, F, van Stokkum, I H M & van Grondelle, R 1997, ' A new pathway for transmembrane electron transfer in photosyntetic reaction centers of Rhodobacter sphaeroides not involving the excited special pair. ', Biochemistry, vol. 36, pp. 6855-6861 . https://doi.org/10.1021/bi9703756 Biochemistry, 36, 6855-6861. American Chemical Society van Brederode, M E, Jones, M R, van Mourik, F, van Stokkum, I H M & van Grondelle, R 1997, ' A new pathway for transmembrane electron transfer in photosynthetic reaction centers of Rhodobacter sphaeroides not involving the excited special pair. ', Biochemistry, vol. 36, pp. 6855-6861 . https://doi.org/10.1021/bi9703756 |
| ISSN: | 1520-4995 0006-2960 |
| DOI: | 10.1021/bi9703756 |
| Popis: | It is generally accepted that electron transfer in bacterial photosynthesis is driven by the first singlet excited state of a special pair of bacteriochlorophylls (P*). We have examined the first steps of electron transfer in a mutant of the Rhodobacter sphaeroides reaction center in which charge separation from P* is dramatically slowed down. The results provide for the first time clear evidence that excitation of the monomeric bacteriochlorophyll in the active branch of the reaction center (B(A)) drives ultrafast transmembrane electron transfer without the involvement of P*, demonstrating a new and efficient mechanism for solar energy transduction in photosynthesis. The most abundant charge-separated intermediate state probably is P+B(A)-, which is formed within 200 fs from B(A)* and decays with a lifetime of 6.5 ps into P+H(A)-. We also see evidence for the involvement of a B(A)+H(A)- state in the alternative pathway. |
| Databáze: | OpenAIRE |
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