Modelling excitation energy transfer and trapping in the filamentous cyanobacterium Anabaena variabilis PCC 7120
| Autor: | Xinpeng Huang, Avratanu Biswas, Ivo H. M. van Stokkum, Petar H. Lambrev |
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| Přispěvatelé: | Biophysics Photosynthesis/Energy, LaserLaB - Energy |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Photosystem I Photosystem II Target analysis Plant Science Thylakoids 7. Clean energy 01 natural sciences Biochemistry 03 medical and health sciences Anabaena variabilis Phycobilisomes SDG 7 - Affordable and Clean Energy Photosystem Allophycocyanin Photosystem I Protein Complex biology Chemistry Chlorophyll A Spectrum Analysis Photosystem II Protein Complex Cell Biology General Medicine Models Theoretical Chromophore biology.organism_classification Phycobilisome Light harvesting Spectrometry Fluorescence 030104 developmental biology Energy Transfer Biophysics Original Article Excitation Global analysis 010606 plant biology & botany |
| Zdroj: | Biswas, A, Huang, X, Lambrev, P H & van Stokkum, I H M 2020, ' Modelling excitation energy transfer and trapping in the filamentous cyanobacterium Anabaena variabilis PCC 7120 ', Photosynthesis Research, vol. 144, no. 2, pp. 261-272 . https://doi.org/10.1007/s11120-020-00723-0 Photosynthesis Research Photosynthesis Research, 144(2), 261-272. Springer Netherlands |
| ISSN: | 0166-8595 |
| DOI: | 10.1007/s11120-020-00723-0 |
| Popis: | The phycobilisome (PBS) serves as the major light-harvesting system, funnelling excitation energy to both photosystems (PS) in cyanobacteria and red algae. The picosecond kinetics involving the excitation energy transfer has been studied within the isolated systems and intact filaments of the cyanobacterium Anabaena variabilis PCC 7120. A target model is proposed which resolves the dynamics of the different chromophore groups. The energy transfer rate of 8.5 ± 1.0/ns from the rod to the core is the rate-limiting step, both in vivo and in vitro. The PBS-PSI-PSII supercomplex reveals efficient excitation energy migration from the low-energy allophycocyanin, which is the terminal emitter, in the PBS core to the chlorophyll a in the photosystems. The terminal emitter of the phycobilisome transfers energy to both PSI and PSII with a rate of 50 ± 10/ns, equally distributing the solar energy to both photosystems. Finally, the excitation energy is trapped by charge separation in the photosystems with trapping rates estimated to be 56 ± 6/ns in PSI and 14 ± 2/ns in PSII. Electronic supplementary material The online version of this article (10.1007/s11120-020-00723-0) contains supplementary material, which is available to authorized users. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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