Molecular Adaptation of Photoprotection: Triplet States in Light-Harvesting Proteins
| Autor: | John T. M. Kennis, Maxime T. A. Alexandre, Maria M. Mendes-Pinto, Alessandro Marin, Luc Bordes, Katerina Stoitchkova, Peter Horton, Leonas Valkunas, Bruno Robert, Andrew A. Pascal, Sandra Andrianambinintsoa, Rudi Berera, Alexander V. Ruban, Andrew Gall, Rienk van Grondelle |
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| Přispěvatelé: | Système membranaires, photobiologie, stress et détoxication (SMPSD), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Institut de Biologie et de Technologies de Saclay (IBITECS), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Biophysics Photosynthesis/Energy, LaserLaB - Energy, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Models
Molecular Light Protein Conformation Biophysics Spectroscopy Imaging and Other Techniques Light-Harvesting Protein Complexes Electrons 010402 general chemistry Photochemistry Photosynthesis Spectrum Analysis Raman 01 natural sciences Purple bacteria Vibration 03 medical and health sciences chemistry.chemical_compound Pigment Protein structure Spinacia oleracea Proteobacteria Spectroscopy Fourier Transform Infrared Carotenoid Bacteriochlorophylls 030304 developmental biology chemistry.chemical_classification 0303 health sciences Quantitative Biology::Biomolecules Physics::Biological Physics biology Photosystem II Protein Complex biology.organism_classification Carotenoids 0104 chemical sciences [SDV.BBM.BP]Life Sciences [q-bio]/Biochemistry Molecular Biology/Biophysics chemistry Chlorophyll Photoprotection visual_art visual_art.visual_art_medium Bacteriochlorophyll Protein Binding |
| Zdroj: | Biophysical Journal Biophysical Journal, Biophysical Society, 2011, pp.934-942 Biophysical Journal, 101(4), 934-942. Biophysical Society Biophysical Journal, 2011, 101 (4), pp.934-942. ⟨10.1016/j.bpj.2011.05.057⟩ Gall, A, Berera, R, Alexandre, M T A, Pascal, A A, Bordes, L, Mendes-Pinto, M M, Andrianambinintsoa, S, Stoitchkova, K V, Marin, A, Valkunas, L, Horton, P, Kennis, J T M, van Grondelle, R, Ruban, A & Robert, B 2011, ' Molecular Adaptation of Photoprotection: Triplet States in Light-Harvesting Proteins ', Biophysical Journal, vol. 101, no. 4, pp. 934-942 . https://doi.org/10.1016/j.bpj.2011.05.057 |
| ISSN: | 0006-3495 1542-0086 |
| DOI: | 10.1016/j.bpj.2011.05.057 |
| Popis: | The photosynthetic light-harvesting systems of purple bacteria and plants both utilize specific carotenoids as quenchers of the harmful (bacterio)chlorophyll triplet states via triplet-triplet energy transfer. Here, we explore how the binding of carotenoids to the different types of light-harvesting proteins found in plants and purple bacteria provides adaptation in this vital photoprotective function. We show that the creation of the carotenoid triplet states in the light-harvesting complexes may occur without detectable conformational changes, in contrast to that found for carotenoids in solution. However, in plant light-harvesting complexes, the triplet wavefunction is shared between the carotenoids and their adjacent chlorophylls. This is not observed for the antenna proteins of purple bacteria, where the triplet is virtually fully located on the carotenoid molecule. These results explain the faster triplet-triplet transfer times in plant light-harvesting complexes. We show that this molecular mechanism, which spreads the location of the triplet wavefunction through the pigments of plant light-harvesting complexes, results in the absence of any detectable chlorophyll triplet in these complexes upon excitation, and we propose that it emerged as a photoprotective adaptation during the evolution of oxygenic photosynthesis. © 2011 Biophysical Society. |
| Databáze: | OpenAIRE |
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