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Pieper J, Artene P, Rätsep M, Pajusalu M, Freiberg A. Evaluation of Electron–Phonon Coupling and Spectral Densities of Pigment–Protein Complexes by Line-Narrowed Optical Spectroscopy. J Phys Chem B 2018; 122:9289-9301. [DOI: 10.1021/acs.jpcb.8b05220] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Ogren JI, Tong AL, Gordon SC, Chenu A, Lu Y, Blankenship RE, Cao J, Schlau-Cohen GS. Impact of the lipid bilayer on energy transfer kinetics in the photosynthetic protein LH2. Chem Sci 2018; 9:3095-3104. [PMID: 29732092 PMCID: PMC5914429 DOI: 10.1039/c7sc04814a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 02/05/2018] [Indexed: 01/28/2023] Open
Abstract
Photosynthetic purple bacteria convert solar energy to chemical energy with near unity quantum efficiency. The light-harvesting process begins with absorption of solar energy by an antenna protein called Light-Harvesting Complex 2 (LH2). Energy is subsequently transferred within LH2 and then through a network of additional light-harvesting proteins to a central location, termed the reaction center, where charge separation occurs. The energy transfer dynamics of LH2 are highly sensitive to intermolecular distances and relative organizations. As a result, minor structural perturbations can cause significant changes in these dynamics. Previous experiments have primarily been performed in two ways. One uses non-native samples where LH2 is solubilized in detergent, which can alter protein structure. The other uses complex membranes that contain multiple proteins within a large lipid area, which make it difficult to identify and distinguish perturbations caused by protein-protein interactions and lipid-protein interactions. Here, we introduce the use of the biochemical platform of model membrane discs to study the energy transfer dynamics of photosynthetic light-harvesting complexes in a near-native environment. We incorporate a single LH2 from Rhodobacter sphaeroides into membrane discs that provide a spectroscopically amenable sample in an environment more physiological than detergent but less complex than traditional membranes. This provides a simplified system to understand an individual protein and how the lipid-protein interaction affects energy transfer dynamics. We compare the energy transfer rates of detergent-solubilized LH2 with those of LH2 in membrane discs using transient absorption spectroscopy and transient absorption anisotropy. For one key energy transfer step in LH2, we observe a 30% enhancement of the rate for LH2 in membrane discs compared to that in detergent. Based on experimental results and theoretical modeling, we attribute this difference to tilting of the peripheral bacteriochlorophyll in the B800 band. These results highlight the importance of well-defined systems with near-native membrane conditions for physiologically-relevant measurements.
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Affiliation(s)
- John I Ogren
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Ashley L Tong
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Samuel C Gordon
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Aurélia Chenu
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Yue Lu
- Department of Biology and Chemistry , Washington University in St. Louis , St. Louis , MO 63130 , USA
| | - Robert E Blankenship
- Department of Biology and Chemistry , Washington University in St. Louis , St. Louis , MO 63130 , USA
| | - Jianshu Cao
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Gabriela S Schlau-Cohen
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
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Rätsep M, Pajusalu M, Linnanto JM, Freiberg A. Subtle spectral effects accompanying the assembly of bacteriochlorophylls into cyclic light harvesting complexes revealed by high-resolution fluorescence spectroscopy. J Chem Phys 2015; 141:155102. [PMID: 25338912 DOI: 10.1063/1.4897637] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have observed that an assembly of the bacteriochloropyll a molecules into B850 and B875 groups of cyclic bacterial light-harvesting complexes LH2 and LH1, respectively, results an almost total loss of the intra-molecular vibronic structure in the fluorescence spectrum, and simultaneously, an essential enhancement of its phonon sideband due to electron-phonon coupling. While the suppression of the vibronic coupling in delocalized (excitonic) molecular systems is predictable, as also confirmed by our model calculations, a boost of the electron-phonon coupling is rather unexpected. The latter phenomenon is explained by exciton self-trapping, promoted by mixing the molecular exciton states with charge transfer states between the adjacent chromophores in the tightly packed B850 and B875 arrangements. Similar, although less dramatic trends were noted for the light-harvesting complexes containing chlorophyll pigments.
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Affiliation(s)
- Margus Rätsep
- Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
| | - Mihkel Pajusalu
- Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
| | | | - Arvi Freiberg
- Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia and Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia
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Lin C, Renge I, Jankowiak R. Fluorescence line-narrowing difference spectra: Dependence of Huang–Rhys factor on excitation wavelength. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.05.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kunz R, Timpmann K, Southall J, Cogdell RJ, Freiberg A, Köhler J. Exciton Self Trapping in Photosynthetic Pigment–Protein Complexes Studied by Single-Molecule Spectroscopy. J Phys Chem B 2012; 116:11017-23. [DOI: 10.1021/jp3040456] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ralf Kunz
- Experimental Physics IV and
Bayreuth Institute for Macromolecular Research (BIMF), University of Bayreuth, 95440 Bayreuth, Germany
| | - Kõu Timpmann
- Institute of Physics, University of Tartu, Riia 142, Tartu EE-51014, Estonia
| | - June Southall
- Institute of Molecular, Cell and
Systems Biology, College of Medical Veterinary and Life Sciences,
Biomedical Research Building, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
| | - Richard J. Cogdell
- Institute of Molecular, Cell and
Systems Biology, College of Medical Veterinary and Life Sciences,
Biomedical Research Building, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
| | - Arvi Freiberg
- Institute of Physics, University of Tartu, Riia 142, Tartu EE-51014, Estonia
- Institute of Molecular and Cell
Biology, University of Tartu, Riia 23,
Tartu EE-51010, Estonia
| | - Jürgen Köhler
- Experimental Physics IV and
Bayreuth Institute for Macromolecular Research (BIMF), University of Bayreuth, 95440 Bayreuth, Germany
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Freiberg A, Rätsep M, Timpmann K. A comparative spectroscopic and kinetic study of photoexcitations in detergent-isolated and membrane-embedded LH2 light-harvesting complexes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2011; 1817:1471-82. [PMID: 22172735 DOI: 10.1016/j.bbabio.2011.11.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Revised: 11/18/2011] [Accepted: 11/22/2011] [Indexed: 10/14/2022]
Abstract
Integral membrane proteins constitute more than third of the total number of proteins present in organisms. Solubilization with mild detergents is a common technique to study the structure, dynamics, and catalytic activity of these proteins in purified form. However beneficial the use of detergents may be for protein extraction, the membrane proteins are often denatured by detergent solubilization as a result of native lipid membrane interactions having been modified. Versatile investigations of the properties of membrane-embedded and detergent-isolated proteins are, therefore, required to evaluate the consequences of the solubilization procedure. Herein, the spectroscopic and kinetic fingerprints have been established that distinguish excitons in individual detergent-solubilized LH2 light-harvesting pigment-protein complexes from them in the membrane-embedded complexes of purple photosynthetic bacteria Rhodobacter sphaeroides. A wide arsenal of spectroscopic techniques in visible optical range that include conventional broadband absorption-fluorescence, fluorescence anisotropy excitation, spectrally selective hole burning and fluorescence line-narrowing, and transient absorption-fluorescence have been applied over broad temperature range between physiological and liquid He temperatures. Significant changes in energetics and dynamics of the antenna excitons upon self-assembly of the proteins into intracytoplasmic membranes are observed, analyzed, and discussed. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial.
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Affiliation(s)
- Arvi Freiberg
- Institute of Physics, University of Tartu, Tartu, Estonia.
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Cohen Stuart TA, Vengris M, Novoderezhkin VI, Cogdell RJ, Hunter CN, van Grondelle R. Direct visualization of exciton reequilibration in the LH1 and LH2 complexes of Rhodobacter sphaeroides by multipulse spectroscopy. Biophys J 2011; 100:2226-33. [PMID: 21539791 DOI: 10.1016/j.bpj.2011.02.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2010] [Revised: 01/12/2011] [Accepted: 02/07/2011] [Indexed: 11/15/2022] Open
Abstract
The dynamics of the excited states of the light-harvesting complexes LH1 and LH2 of Rhodobacter sphaeroides are governed, mainly, by the excitonic nature of these ring-systems. In a pump-dump-probe experiment, the first pulse promotes LH1 or LH2 to its excited state and the second pulse dumps a portion of the excited state. By selective dumping, we can disentangle the dynamics normally hidden in the excited-state manifold. We find that by using this multiple-excitation technique we can visualize a 400-fs reequilibration reflecting relaxation between the two lowest exciton states that cannot be directly explored by conventional pump-probe. An oscillatory feature is observed within the exciton reequilibration, which is attributed to a coherent motion of a vibrational wavepacket with a period of ∼150 fs. Our disordered exciton model allows a quantitative interpretation of the observed reequilibration processes occurring in these antennas.
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Affiliation(s)
- Thomas A Cohen Stuart
- Faculty of Sciences, Free University of Amsterdam, de Boelelaan, Amsterdam, The Netherlands.
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Pflock TJ, Oellerich S, Southall J, Cogdell RJ, Ullmann GM, Köhler J. The Electronically Excited States of LH2 Complexes from Rhodopseudomonas acidophila Strain 10050 Studied by Time-Resolved Spectroscopy and Dynamic Monte Carlo Simulations. I. Isolated, Non-Interacting LH2 Complexes. J Phys Chem B 2011; 115:8813-20. [DOI: 10.1021/jp202353c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tobias J. Pflock
- Experimental Physics IV and BIMF, University of Bayreuth, D-95440 Bayreuth, Germany
| | - Silke Oellerich
- Experimental Physics IV and BIMF, University of Bayreuth, D-95440 Bayreuth, Germany
| | - June Southall
- Institute of Molecular, Cell and Systems Biology, College of Medical Veterinary and Life Sciences, Biomedical Research Building, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K
| | - Richard J. Cogdell
- Institute of Molecular, Cell and Systems Biology, College of Medical Veterinary and Life Sciences, Biomedical Research Building, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K
| | - G. Matthias Ullmann
- Computational Biochemistry/Bioinformatics, University of Bayreuth, D-95440 Bayreuth
| | - Jürgen Köhler
- Experimental Physics IV and BIMF, University of Bayreuth, D-95440 Bayreuth, Germany
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Pieper J, Rätsep M, Trostmann I, Schmitt FJ, Theiss C, Paulsen H, Eichler H, Freiberg A, Renger G. Excitonic Energy Level Structure and Pigment−Protein Interactions in the Recombinant Water-Soluble Chlorophyll Protein. II. Spectral Hole-Burning Experiments. J Phys Chem B 2011; 115:4053-65. [DOI: 10.1021/jp111457t] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Pieper
- Max-Volmer-Laboratories for
Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany
| | - M. Rätsep
- Institute of Physics, University of Tartu, Tartu, Estonia
| | - I. Trostmann
- Institute of General Botany, Johannes Gutenberg University Mainz, Germany
| | - F.-J. Schmitt
- Max-Volmer-Laboratories for
Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany
- Institute of Optics and Atomic
Physics, Berlin Institute of Technology, Germany
| | - C. Theiss
- Institute of Optics and Atomic
Physics, Berlin Institute of Technology, Germany
| | - H. Paulsen
- Institute of General Botany, Johannes Gutenberg University Mainz, Germany
| | - H.J. Eichler
- Institute of Optics and Atomic
Physics, Berlin Institute of Technology, Germany
| | - A. Freiberg
- Institute of Physics, University of Tartu, Tartu, Estonia
- Institute of Molecular and Cell
Biology, University of Tartu, Tartu, Estonia
| | - G. Renger
- Max-Volmer-Laboratories for
Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany
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Pajusalu M, Rätsep M, Trinkunas G, Freiberg A. Davydov splitting of excitons in cyclic bacteriochlorophyll a nanoaggregates of bacterial light-harvesting complexes between 4.5 and 263 K. Chemphyschem 2011; 12:634-44. [PMID: 21275034 DOI: 10.1002/cphc.201000913] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2010] [Indexed: 11/06/2022]
Abstract
The nature of electronic excitations created by photon absorption in the cyclic B850 aggregates of 18 bacteriochlorophyll molecules of LH2 antenna complexes of photosynthetic bacteria is studied over a broad temperature range using absorption, fluorescence, and fluorescence anisotropy spectra. The latter technique has been proved to be suitable for revealing the hidden structure of excitons in inhomogeneously broadened spectra of cyclic aggregates. A theoretical model that accounts for differences of absorbing excitons in undeformed and emitting exciton polarons in deformed antenna lattices is also developed. Only a slight decrease of the exciton bandwidth and exciton coupling energy with temperature is observed. Survival of excitons in the whole temperature span from cryogenic to nearly ambient temperatures strongly suggests that collective, coherent electronic excitations might play a role in the functional light-harvesting process taking place at physiological temperatures.
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Affiliation(s)
- Mihkel Pajusalu
- Institute of Physics, Tartu University, Riia 142, Tartu 51014, Estonia
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Reppert M, Naibo V, Jankowiak R. Accurate modeling of fluorescence line narrowing difference spectra: Direct measurement of the single-site fluorescence spectrum. J Chem Phys 2010; 133:014506. [DOI: 10.1063/1.3455890] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Purchase R, Völker S. Spectral hole burning: examples from photosynthesis. PHOTOSYNTHESIS RESEARCH 2009; 101:245-66. [PMID: 19714478 PMCID: PMC2744831 DOI: 10.1007/s11120-009-9484-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Accepted: 07/31/2009] [Indexed: 05/14/2023]
Abstract
The optical spectra of photosynthetic pigment-protein complexes usually show broad absorption bands, often consisting of a number of overlapping, "hidden" bands belonging to different species. Spectral hole burning is an ideal technique to unravel the optical and dynamic properties of such hidden species. Here, the principles of spectral hole burning (HB) and the experimental set-up used in its continuous wave (CW) and time-resolved versions are described. Examples from photosynthesis studied with hole burning, obtained in our laboratory, are then presented. These examples have been classified into three groups according to the parameters that were measured: (1) hole widths as a function of temperature, (2) hole widths as a function of delay time and (3) hole depths as a function of wavelength. Two examples from light-harvesting (LH) 2 complexes of purple bacteria are given within the first group: (a) the determination of energy-transfer times from the chromophores in the B800 ring to the B850 ring, and (b) optical dephasing in the B850 absorption band. One example from photosystem II (PSII) sub-core complexes of higher plants is given within the second group: it shows that the size of the complex determines the amount of spectral diffusion measured. Within the third group, two examples from (green) plants and purple bacteria have been chosen for: (a) the identification of "traps" for energy transfer in PSII sub-core complexes of green plants, and (b) the uncovering of the lowest k = 0 exciton-state distribution within the B850 band of LH2 complexes of purple bacteria. The results prove the potential of spectral hole burning measurements for getting quantitative insight into dynamic processes in photosynthetic systems at low temperature, in particular, when individual bands are hidden within broad absorption bands. Because of its high-resolution wavelength selectivity, HB is a technique that is complementary to ultrafast pump-probe methods. In this review, we have provided an extensive bibliography for the benefit of scientists who plan to make use of this valuable technique in their future research.
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Affiliation(s)
- Robin Purchase
- Huygens and Gorlaeus Laboratories, Leiden University, 2300 RA Leiden, The Netherlands
| | - Silvia Völker
- Huygens and Gorlaeus Laboratories, Leiden University, 2300 RA Leiden, The Netherlands
- Department of Biophysics, Faculty of Exact Sciences, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
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Pieper J, Rätsep M, Irrgang KD, Freiberg A. Chromophore−Chromophore and Chromophore−Protein Interactions in Monomeric Light-Harvesting Complex II of Green Plants Studied by Spectral Hole Burning and Fluorescence Line Narrowing. J Phys Chem B 2009; 113:10870-80. [DOI: 10.1021/jp900836p] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jörg Pieper
- Max-Volmer-Laboratories for Biophysical Chemistry, Technical University Berlin, Berlin, Germany, Institute of Physics, University of Tartu, Tartu, Estonia, Department of Life Science & Technology, Laboratory of Biochemistry, University for Applied Sciences, Berlin, Germany, and Institute of Molecular and Cell Biology, University of Tartu, Tartu, Estonia
| | - Margus Rätsep
- Max-Volmer-Laboratories for Biophysical Chemistry, Technical University Berlin, Berlin, Germany, Institute of Physics, University of Tartu, Tartu, Estonia, Department of Life Science & Technology, Laboratory of Biochemistry, University for Applied Sciences, Berlin, Germany, and Institute of Molecular and Cell Biology, University of Tartu, Tartu, Estonia
| | - Klaus-Dieter Irrgang
- Max-Volmer-Laboratories for Biophysical Chemistry, Technical University Berlin, Berlin, Germany, Institute of Physics, University of Tartu, Tartu, Estonia, Department of Life Science & Technology, Laboratory of Biochemistry, University for Applied Sciences, Berlin, Germany, and Institute of Molecular and Cell Biology, University of Tartu, Tartu, Estonia
| | - Arvi Freiberg
- Max-Volmer-Laboratories for Biophysical Chemistry, Technical University Berlin, Berlin, Germany, Institute of Physics, University of Tartu, Tartu, Estonia, Department of Life Science & Technology, Laboratory of Biochemistry, University for Applied Sciences, Berlin, Germany, and Institute of Molecular and Cell Biology, University of Tartu, Tartu, Estonia
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Freiberg A, Rätsep M, Timpmann K, Trinkunas G. Excitonic polarons in quasi-one-dimensional LH1 and LH2 bacteriochlorophyll a antenna aggregates from photosynthetic bacteria: A wavelength-dependent selective spectroscopy study. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2008.10.043] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Freiberg A, Trinkunas G. Unraveling the Hidden Nature of Antenna Excitations. PHOTOSYNTHESIS IN SILICO 2009. [DOI: 10.1007/978-1-4020-9237-4_4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Rätsep M, Pieper J, Irrgang KD, Freiberg A. Excitation Wavelength-Dependent Electron−Phonon and Electron−Vibrational Coupling in the CP29 Antenna Complex of Green Plants. J Phys Chem B 2007; 112:110-8. [DOI: 10.1021/jp075170d] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Margus Rätsep
- Institute of Physics, and Institute of Molecular and Cell Biology, University of Tartu, Riia 142, 51014 Tartu, Estonia, Max-Volmer-Laboratories for Biophysical Chemistry, Technical University Berlin, PC14, Strasse des 17. Juni 135, 10623 Berlin, Germany, and Department of Life Science and Technology, Laboratory of Biochemistry, University of Applied Sciences, Forum Seestrasse, Seestrasse 64, 13347 Berlin, Germany
| | - Jörg Pieper
- Institute of Physics, and Institute of Molecular and Cell Biology, University of Tartu, Riia 142, 51014 Tartu, Estonia, Max-Volmer-Laboratories for Biophysical Chemistry, Technical University Berlin, PC14, Strasse des 17. Juni 135, 10623 Berlin, Germany, and Department of Life Science and Technology, Laboratory of Biochemistry, University of Applied Sciences, Forum Seestrasse, Seestrasse 64, 13347 Berlin, Germany
| | - Klaus-Dieter Irrgang
- Institute of Physics, and Institute of Molecular and Cell Biology, University of Tartu, Riia 142, 51014 Tartu, Estonia, Max-Volmer-Laboratories for Biophysical Chemistry, Technical University Berlin, PC14, Strasse des 17. Juni 135, 10623 Berlin, Germany, and Department of Life Science and Technology, Laboratory of Biochemistry, University of Applied Sciences, Forum Seestrasse, Seestrasse 64, 13347 Berlin, Germany
| | - Arvi Freiberg
- Institute of Physics, and Institute of Molecular and Cell Biology, University of Tartu, Riia 142, 51014 Tartu, Estonia, Max-Volmer-Laboratories for Biophysical Chemistry, Technical University Berlin, PC14, Strasse des 17. Juni 135, 10623 Berlin, Germany, and Department of Life Science and Technology, Laboratory of Biochemistry, University of Applied Sciences, Forum Seestrasse, Seestrasse 64, 13347 Berlin, Germany
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Rätsep M, Freiberg A. Unusual temperature quenching of bacteriochlorophyll a fluorescence in FMO antenna protein trimers. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2006.12.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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