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Investigating carotenoid photophysics in photosynthesis with 2D electronic spectroscopy. TRENDS IN CHEMISTRY 2021. [DOI: 10.1016/j.trechm.2021.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Razjivin A, Götze J, Lukashev E, Kozlovsky V, Ashikhmin A, Makhneva Z, Moskalenko A, Lokstein H, Paschenko V. Lack of Excitation Energy Transfer from the Bacteriochlorophyll Soret Band to Carotenoids in Photosynthetic Complexes of Purple Bacteria. J Phys Chem B 2021; 125:3538-3545. [PMID: 33818091 DOI: 10.1021/acs.jpcb.1c00719] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The excitation energy transfer (EET) from the bacteriochlorophyll (BChl) Soret band to the second excited state(s) (S2) of carotenoids in pigment-protein complexes of purple bacteria was investigated. The efficiency of EET was determined, based on fluorescence excitation and absorption spectra of chromatophores, peripheral light-harvesting complexes (LH2), core complexes (LH1-RC), and pigments in solution. Carotenoid-containing and carotenoid-less samples were compared: LH1-RC and LH2 from Allochromatium minutissimum, Ectothiorhodospira haloalkaliphila, and chromatophores from Rhodobacter sphaeroides and Rhodospirillum rubrum wild type and carotenoid-free strains R-26 and G9. BChl-to-carotenoid EET was absent, or its efficiency was less than the accuracy of the measurements of ∼5%. Quantum chemical calculations support the experimental results: The transition dipole moments of spatially close carotenoid/BChl pairs were found to be nearly orthogonal. The structural arrangements suggest that Soret EET may be lacking for the studied systems, however, EET from carotenoids to Qx appears to be possible.
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Affiliation(s)
- Andrei Razjivin
- Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Jan Götze
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany
| | - Evgeny Lukashev
- Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Vladimir Kozlovsky
- Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Aleksandr Ashikhmin
- Institute of Basic Biological Problems of Russian Academy of Sciences, Federal Research Center "Pushchino Scientific Center for Biological Research of Russian Academy of Sciences", 142290, Pushchino, Russia
| | - Zoya Makhneva
- Institute of Basic Biological Problems of Russian Academy of Sciences, Federal Research Center "Pushchino Scientific Center for Biological Research of Russian Academy of Sciences", 142290, Pushchino, Russia
| | - Andrey Moskalenko
- Institute of Basic Biological Problems of Russian Academy of Sciences, Federal Research Center "Pushchino Scientific Center for Biological Research of Russian Academy of Sciences", 142290, Pushchino, Russia
| | - Heiko Lokstein
- Department of Chemical Physics and Optics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic
| | - Vladimir Paschenko
- Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
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Razjivin AP, Lukashev EP, Kompanets VO, Kozlovsky VS, Ashikhmin AA, Chekalin SV, Moskalenko AA, Paschenko VZ. Excitation energy transfer from the bacteriochlorophyll Soret band to carotenoids in the LH2 light-harvesting complex from Ectothiorhodospira haloalkaliphila is negligible. PHOTOSYNTHESIS RESEARCH 2017; 133:289-295. [PMID: 28205063 DOI: 10.1007/s11120-017-0341-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 01/18/2017] [Indexed: 06/06/2023]
Abstract
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.
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Affiliation(s)
- A P Razjivin
- Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia, 119991.
| | - E P Lukashev
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia, 119991
| | - V O Kompanets
- Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia, 142190
| | - V S Kozlovsky
- Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia, 119991
| | - A A Ashikhmin
- Institute of Fundamental Problems of Biology, Russian Academy of Sciences, Pushchino, Moscow Region, Russia, 142290
| | - S V Chekalin
- Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia, 142190
| | - A A Moskalenko
- Institute of Fundamental Problems of Biology, Russian Academy of Sciences, Pushchino, Moscow Region, Russia, 142290
| | - V Z Paschenko
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia, 119991
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Hauer J, Maiuri M, Viola D, Lukes V, Henry S, Carey AM, Cogdell RJ, Cerullo G, Polli D. Explaining the temperature dependence of spirilloxanthin's S* signal by an inhomogeneous ground state model. J Phys Chem A 2013; 117:6303-10. [PMID: 23577754 PMCID: PMC3725610 DOI: 10.1021/jp4011372] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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We
investigate the nature of the S* excited state in carotenoids by performing
a series of pump–probe experiments with sub-20 fs time resolution
on spirilloxanthin in a polymethyl-methacrylate matrix varying the
sample temperature. Following photoexcitation, we observe sub-200
fs internal conversion of the bright S2 state into the
lower-lying S1 and S* states, which in turn relax to the
ground state on a picosecond time scale. Upon cooling down the sample
to 77 K, we observe a systematic decrease of the S*/S1 ratio.
This result can be explained by assuming two thermally populated ground
state isomers. The higher lying one generates the S* state, which
can then be effectively frozen out by cooling. These findings are
supported by quantum chemical modeling and provide strong evidence
for the existence and importance of ground state isomers in the photophysics
of carotenoids.
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Affiliation(s)
- J Hauer
- Photonics Institute, Vienna University of Technology, Gusshausstrasse 27, 1040 Vienna, Austria
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Kosumi D, Maruta S, Horibe T, Nagaoka Y, Fujii R, Sugisaki M, Cogdell RJ, Hashimoto H. Ultrafast excited state dynamics of spirilloxanthin in solution and bound to core antenna complexes: Identification of the S* and T1 states. J Chem Phys 2012; 137:064505. [DOI: 10.1063/1.4737129] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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