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Govindjee G, Amesz B, Garab G, Stirbet A. Remembering Jan Amesz (1934-2001): a great gentleman, a major discoverer, and an internationally renowned biophysicist of both oxygenic and anoxygenic photosynthesis a. PHOTOSYNTHESIS RESEARCH 2024; 160:125-142. [PMID: 38687462 DOI: 10.1007/s11120-024-01102-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 04/18/2024] [Indexed: 05/02/2024]
Abstract
We present here the research contributions of Jan Amesz (1934-2001) on deciphering the details of the early physico-chemical steps in oxygenic photosynthesis in plants, algae and cyanobacteria, as well as in anoxygenic photosynthesis in purple, green, and heliobacteria. His research included light absorption and the mechanism of excitation energy transfer, primary photochemistry, and electron transfer steps until the reduction of pyridine nucleotides. Among his many discoveries, we emphasize his 1961 proof, with L. N. M. Duysens, of the "series scheme" of oxygenic photosynthesis, through antagonistic effects of Light I and II on the redox state of cytochrome f. Further, we highlight the following research on oxygenic photosynthesis: the experimental direct proof that plastoquinone and plastocyanin function at their respective places in the Z-scheme. In addition, Amesz's major contributions were in unraveling the mechanism of excitation energy transfer and electron transport steps in anoxygenic photosynthetic bacteria (purple, green and heliobacteria). Before we present his research, focusing on his key discoveries, we provide a glimpse of his personal life. We end this Tribute with reminiscences from three of his former doctoral students (Sigi Neerken; Hjalmar Pernentier, and Frank Kleinherenbrink) and from several scientists (Suleyman Allakhverdiev; Robert Blankenship; Richard Cogdell) including two of the authors (G. Garab and A. Stirbet) of this Tribute.
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Affiliation(s)
- Govindjee Govindjee
- Department of Plant Biology, Department of Biochemistry, and the Center of Biophysics & Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| | - Bas Amesz
- Albertus Perkstraat 35, 1217 NL, Hilversum, The Netherlands
| | - Győző Garab
- Biological Research Centre, Institute of Plant Biology, HUN-REN, 6726, Szeged, Hungary
- Department of Physics, Faculty of Science, University of Ostrava, 71000, Ostrava, Czech Republic
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Stability and properties of quasi-stable conformational states in the LH2 light-harvesting complex of Rbl. acidophilus bacteria formed by hexacoordination of bacteriochlorophyll a magnesium atom. Chem Phys 2017. [DOI: 10.1016/j.chemphys.2017.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Shi Y, Zhao NJ, Wang P, Fu LM, Yu LJ, Zhang JP, Wang-Otomo ZY. Thermal Adaptability of the Light-Harvesting Complex 2 from Thermochromatium tepidum: Temperature-Dependent Excitation Transfer Dynamics. J Phys Chem B 2015; 119:14871-9. [DOI: 10.1021/acs.jpcb.5b09023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ying Shi
- Department
of Chemistry, Renmin University of China, Beijing 1000872, P. R. China
| | - Ning-Jiu Zhao
- Department
of Chemistry, Renmin University of China, Beijing 1000872, P. R. China
| | - Peng Wang
- Department
of Chemistry, Renmin University of China, Beijing 1000872, P. R. China
| | - Li-Min Fu
- Department
of Chemistry, Renmin University of China, Beijing 1000872, P. R. China
| | - Long-Jiang Yu
- Faculty
of Science, Ibaraki University, Mito 310-8512, Japan
| | - Jian-Ping Zhang
- Department
of Chemistry, Renmin University of China, Beijing 1000872, P. R. China
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Ostroumov EE, Khan YR, Scholes GD, Govindjee. Photophysics of Photosynthetic Pigment-Protein Complexes. ADVANCES IN PHOTOSYNTHESIS AND RESPIRATION 2014. [DOI: 10.1007/978-94-017-9032-1_4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Niedzwiedzki DM, Bina D, Picken N, Honkanen S, Blankenship RE, Holten D, Cogdell RJ. Spectroscopic studies of two spectral variants of light-harvesting complex 2 (LH2) from the photosynthetic purple sulfur bacterium Allochromatium vinosum. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:1576-87. [PMID: 22659401 DOI: 10.1016/j.bbabio.2012.05.009] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 05/08/2012] [Accepted: 05/22/2012] [Indexed: 11/17/2022]
Abstract
Two spectral forms of the peripheral light-harvesting complex (LH2) from the purple sulfur photosynthetic bacterium Allochromatium vinosum were purified and their photophysical properties characterized. The complexes contain bacteriochlorophyll a (BChl a) and multiple species of carotenoids. The composition of carotenoids depends on the light conditions applied during growth of the cultures. In addition, LH2 grown under high light has a noticeable split of the B800 absorption band. The influence of the change of carotenoid distribution as well as the spectral change of the excitonic absorption of the bacteriochlorophylls on the light-harvesting ability was studied using steady-state absorption, fluorescence and femtosecond time-resolved absorption at 77K. The results demonstrate that the change of the distribution of the carotenoids when cells were grown at low light adapts the absorptive properties of the complex to the light conditions and maintains maximum photon-capture performance. In addition, an explanation for the origin of the enigmatic split of the B800 absorption band is provided. This spectral splitting is also observed in LH2 complexes from other photosynthetic sulfur purple bacterial species. According to results obtained from transient absorption spectroscopy, the B800 band split originates from two spectral forms of the associated BChl a monomeric molecules bound within the same complex.
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You ZQ, Hsu CP. Ab inito study on triplet excitation energy transfer in photosynthetic light-harvesting complexes. J Phys Chem A 2011; 115:4092-100. [PMID: 21410281 DOI: 10.1021/jp200200x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have studied the triplet energy transfer (TET) for photosynthetic light-harvesting complexes, the bacterial light-harvesting complex II (LH2) of Rhodospirillum molischianum and Rhodopseudomonas acidophila, and the peridinin-chlorophyll a protein (PCP) from Amphidinium carterae. The electronic coupling factor was calculated with the recently developed fragment spin difference scheme (You and Hsu, J. Chem. Phys. 2010, 133, 074105), which is a general computational scheme that yields the overall coupling under the Hamiltonian employed. The TET rates were estimated based on the couplings obtained. For all light-harvesting complexes studied, there exist nanosecond triplet energy transfer from the chlorophylls to the carotenoids. This result supports a direct triplet quenching mechanism for the photoprotection function of carotenoids. The TET rates are similar for a broad range of carotenoid triplet state energy, which implies a general and robust TET quenching role for carotenoids in photosynthesis. This result is also consistent with the weak dependence of TET kinetics on the type or the number of π conjugation lengths in the carotenoids and their analogues reported in the literature. We have also explored the possibility of forming triplet excitons in these complexes. In B850 of LH2 or the peridinin cluster in PCP, it is unlikely to have triplet exciton since the energy differences of any two neighboring molecules are likely to be much larger than their TET couplings. Our results provide theoretical limits to the possible photophysics in the light-harvesting complexes.
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Affiliation(s)
- Zhi-Qiang You
- Taiwan International Graduate Program, Academia Sinica, 128 Section 2 Academia Road, Nankang, Taipei 11529, Taiwan
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Novoderezhkin VI, Cohen Stuart TA, van Grondelle R. Dynamics of Exciton Relaxation in LH2 Antenna Probed by Multipulse Nonlinear Spectroscopy. J Phys Chem A 2011; 115:3834-44. [DOI: 10.1021/jp108187m] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vladimir I. Novoderezhkin
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Leninskie Gory, 119992 Moscow, Russia
| | - Thomas A. Cohen Stuart
- Department of Biophysics, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Rienk van Grondelle
- Department of Biophysics, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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Olbrich C, Kleinekathöfer U. Time-dependent atomistic view on the electronic relaxation in light-harvesting system II. J Phys Chem B 2011; 114:12427-37. [PMID: 20809619 DOI: 10.1021/jp106542v] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Aiming at a better understanding of the molecular details in light absorption during photosynthesis, spatial and temporal correlation functions as well as spectral densities have been determined. At the focus of the present study are the light-harvesting II complexes of the purple bacterium Rhodospirillum molischianum. The calculations are based on a time-dependent combination of molecular dynamics simulations and quantum chemistry methods. Using a 12 ps long trajectory, different quantum chemical methods have been compared to each other. Furthermore, several approaches to determine the couplings between the individual chromophores have been tested. Correlations between energy gap fluctuations of different individual pigments are analyzed but found to be negligible. From the energy gap fluctuations, spectral densities are extracted which serve as input for calculations of optical properties and exciton dynamics. To this end, the spectral densities are tested by determining the linear absorption of the complete two-ring system. One important difference from earlier studies is given by the severely extended length of the trajectory along which the quantum chemical calculations have been performed. Due to this extension, more accurate and reliable data have been obtained in the low frequency regime which is important in the dynamics of electronic relaxation.
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Affiliation(s)
- Carsten Olbrich
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany
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Linnanto J, Korppi-Tommola J. Modelling excitonic energy transfer in the photosynthetic unit of purple bacteria. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2009.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Sugisaki M, Fujii R, Cogdell RJ, Hashimoto H. Linear and nonlinear optical responses in bacteriochlorophyll a. PHOTOSYNTHESIS RESEARCH 2008; 95:309-316. [PMID: 17926140 DOI: 10.1007/s11120-007-9266-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2007] [Accepted: 09/13/2007] [Indexed: 05/25/2023]
Abstract
Nonlinear optical responses of bacteriochlorophyll a (BChl a) were investigated by means of the three-pulse four-wave mixing (FWM) technique under the resonant excitation into the Q ( y ) band. The experimental results are explained by a theoretical model calculation including the Brownian oscillation mode of the solvent. We have determined the spectral density, which is the most important function with which to calculate optical signals. The linear absorption spectrum can be reproduced fairly well when the vibronic oscillation modes of the solvent together with those of BChl a are properly taken into consideration. The FWM signal was also calculated using the spectral density. It was found that a simple two-level model could not explain the experimental result. The effect of the higher-order interactions is discussed.
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Affiliation(s)
- Mitsuru Sugisaki
- Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi, Osaka, 558-8585, Japan.
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Kobayashi T, Taneichi T, Takasaka S. Exciton energy transfer between optically forbidden states of molecular aggregates. J Chem Phys 2007; 126:194705. [PMID: 17523826 DOI: 10.1063/1.2730815] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
3-ethyl-2-[3-(3-ethyl-2(3H)-benzoxazolylidene)-1-propenyl]benzoxazolium iodide (dye I) and pseudoisocyanine bromide are employed to form H aggregates as donors and J aggregates as acceptors. The energy of an H band of the H aggregates is higher than that of a J band of the J aggregates. It was confirmed that excitation of the H band does not emit fluorescence by comparison of excitation spectra of dye I H aggregates with that of dye I monomer. Absorption, fluorescence, and excitation spectra of spin-coated films of H aggregates mixed with various quantities of J aggregates have been observed. Excitation spectra probed at the J band are found to have a component of the H band. Fluorescence spectra originated from excitation of the H band are extracted and qualitatively analyzed. It is confirmed that excitation of the H band causes to emit fluorescence of a J band of the J aggregates. These phenomena show that exciton energy can transfer from the lowest energy in electronic states of the H aggregate, which state is optically forbidden, to electronic state of the J aggregate.
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Affiliation(s)
- Takayoshi Kobayashi
- ICORP, JST, Kawaguchi Center Building, 4-1-8 Honcho, Kawaguchi-shi, Saitama 332-0012, Japan
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van Grondelle R, Novoderezhkin VI. Energy transfer in photosynthesis: experimental insights and quantitative models. Phys Chem Chem Phys 2005; 8:793-807. [PMID: 16482320 DOI: 10.1039/b514032c] [Citation(s) in RCA: 380] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We overview experimental and theoretical studies of energy transfer in the photosynthetic light-harvesting complexes LH1, LH2, and LHCII performed during the past decade since the discovery of high-resolution structure of these complexes. Experimental findings obtained with various spectroscopic techniques makes possible a modelling of the excitation dynamics at a quantitative level. The modified Redfield theory allows a precise assignment of the energy transfer pathways together with a direct visualization of the whole excitation dynamics where various regimes from a coherent motion of delocalized exciton to a hopping of localized excitations are superimposed. In a single complex it is possible to observe the switching between these regimes driven by slow conformational motion (as we demonstrate for LH2). Excitation dynamics under quenched conditions in higher-plant complexes is discussed.
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Affiliation(s)
- Rienk van Grondelle
- Department of Biophysics, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
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Energetic disorder and the B850-exciton states of individual light-harvesting 2 complexes from Rhodopseudomonas acidophila. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.08.020] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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de Ruijter WPF, Oellerich S, Segura JM, Lawless AM, Papiz M, Aartsma TJ. Observation of the energy-level structure of the low-light adapted B800 LH4 complex by single-molecule spectroscopy. Biophys J 2004; 87:3413-20. [PMID: 15326024 PMCID: PMC1304807 DOI: 10.1529/biophysj.104.044719] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Low-light adapted B800 light-harvesting complex 4 (LH4) from Rhodopseudomonas palustris is a complex in which the arrangement of the bacteriochloropyll a pigments is very different from the well-known B800-850 LH2 complex. For bulk samples, the main spectroscopic feature in the near-infrared is the occurrence of a single absorption band at 802 nm. Single-molecule spectroscopy can resolve the narrow bands that are associated with the exciton states of the individual complexes. The low temperature (1.2 K) fluorescence excitation spectra of individual LH4 complexes are very heterogeneous and display unique features. It is shown that an exciton model can adequately reproduce the polarization behavior of the complex, the experimental distributions of the number of observed peaks per complex, and the widths of the absorption bands. The results indicate that the excited states are mainly localized on one or a few subunits of the complex and provide further evidence supporting the recently proposed structure model.
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Affiliation(s)
- W P F de Ruijter
- Department of Biophysics, Leiden University, Leiden, The Netherlands
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Wendling M, Mourik FV, van Stokkum IHM, Salverda JM, Michel H, Grondelle RV. Low-intensity pump-probe measurements on the B800 band of Rhodospirillum molischianum. Biophys J 2003; 84:440-9. [PMID: 12524297 PMCID: PMC1302625 DOI: 10.1016/s0006-3495(03)74864-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We have measured low-intensity, polarized one-color pump-probe traces in the B800 band of the light-harvesting complex LH2 of Rhodospirillum molischianum at 77 K. The excitation/detection wavelength was tuned through the B800 band. A single-wavelength and a global target analysis of the data were performed with a model that accounts for excitation energy transfer among the B800 molecules and from B800 to B850. By including the anisotropy of the signals into the fitting procedure, both transfer processes could be separated. It was estimated in the global target analysis that the intra-B800 energy transfer, i.e., the hopping of the excitation from one B800 to another B800 molecule, takes approximately 0.5 ps at 77 K. This transfer time increases with the excitation/detection wavelength from 0.3 ps on the blue side of the B800 band to approximately 0.8 ps on the red side. The residual B800 anisotropy shows a wavelength dependence as expected for energy transfer within an inhomogeneously broadened cluster of weakly coupled pigments. In the global target analysis, the transfer time from B800 to B850 was determined to be approximately 1.7 ps at 77 K. In the single-wavelength analysis, a speeding-up of the B800 --> B850 energy transfer rate toward the blue edge of the B800 band was found. This nicely correlates with the proposed position of the suggested high-exciton component of the B850 band acting as an additional decay channel for B800 excitations.
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Affiliation(s)
- Markus Wendling
- Department of Biophysics and Physics of Complex Systems, Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
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Fukutake N, Takasaka S, Kobayashi T. Energy transfer between two kinds of J-aggregates studied by near-field absorption-fluorescence spectroscopy. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00882-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Novoderezhkin V, van Grondelle R. Exciton−Vibrational Relaxation and Transient Absorption Dynamics in LH1 of Rhodopseudomonas viridis: A Redfield Theory Approach. J Phys Chem B 2002. [DOI: 10.1021/jp012048k] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vladimir Novoderezhkin
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow 119899, Russia, and Department of Biophysics, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Rienk van Grondelle
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow 119899, Russia, and Department of Biophysics, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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Damjanović A, Kosztin I, Kleinekathöfer U, Schulten K. Excitons in a photosynthetic light-harvesting system: a combined molecular dynamics, quantum chemistry, and polaron model study. PHYSICAL REVIEW E 2002; 65:031919. [PMID: 11909121 DOI: 10.1103/physreve.65.031919] [Citation(s) in RCA: 245] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2001] [Revised: 12/13/2001] [Indexed: 11/07/2022]
Abstract
The dynamics of pigment-pigment and pigment-protein interactions in light-harvesting complexes is studied with an approach that combines molecular dynamics simulations with quantum chemistry calculations and a polaron model analysis. The molecular dynamics simulation of light-harvesting (LH) complexes was performed on an 87 055 atom system comprised of a LH-II complex of Rhodospirillum molischianum embedded in a lipid bilayer and surrounded with appropriate water layers. For each of the 16 B850 bacteriochlorophylls (BChls), we performed 400 ab initio quantum chemistry calculations on geometries that emerged from the molecular dynamical simulations, determining the fluctuations of pigment excitation energies as a function of time. From the results of these calculations we construct a time-dependent Hamiltonian of the B850 exciton system from which we determine within linear response theory the absorption spectrum. Finally, a polaron model is introduced to describe both the excitonic and coupled phonon degrees of freedom by quantum mechanics. The exciton-phonon coupling that enters into the polaron model, and the corresponding phonon spectral function, are derived from the molecular dynamics and quantum chemistry simulations. The model predicts that excitons in the B850 BChl ring are delocalized over five pigments at room temperature. Also, the polaron model permits the calculation of the absorption and circular dichroism spectra of the B850 excitons from the sole knowledge of the autocorrelation function of the excitation energies of individual BChls, which is readily available from the combined molecular dynamics and quantum chemistry simulations. The obtained results are found to be in good agreement with the experimentally measured absorption and circular dichroism spectra.
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Affiliation(s)
- Ana Damjanović
- Beckman Institute and Department of Physics, University of Illinois, Urbana, Illinois 61801, USA
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Kumble R, Howard T, Cogdell R, Hochstrasser R. Dynamic infrared band–band spectroscopy of peripheral light-harvesting complexes from R. acidophila. J Photochem Photobiol A Chem 2001. [DOI: 10.1016/s1010-6030(01)00505-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Matysik J, Soede-Huijbregts C, Baldus M, Raap J, Lugtenburg J, Gast P, van Gorkom HJ, Hoff AJ, de Groot HJ. Ultrahigh field MAS NMR dipolar correlation spectroscopy of the histidine residues in light-harvesting complex II from photosynthetic bacteria reveals partial internal charge transfer in the B850/His complex. J Am Chem Soc 2001; 123:4803-9. [PMID: 11457290 DOI: 10.1021/ja002591z] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Low-temperature 15N and 13C CP/MAS (cross-polarization/magic angle spinning) NMR has been used to analyze BChl-histidine interactions and the electronic structure of histidine residues in the light-harvesting complex II (LH2) of Rhodopseudomonas acidophila. The histidines were selectively labeled at both or one of the two nitrogen sites of the imidazole ring. The resonances of histidine nitrogens that are interacting with B850 BChl a have been assigned. Specific 15N labeling confirmed that it is the tau-nitrogen of histidines which is ligated to Mg2+ of B850 BChl molecules (beta-His30, alpha-His31). The pi-nitrogens of these Mg2+-bound histidines were found to be protonated and may be involved in hydrogen bond interactions. Comparison of the 2-D MAS NMR homonuclear (13C-13C) dipolar correlation spectrum of [13C6,15N3]-histidines in the LH2 complex with model systems in the solid state reveals two different classes of electronic structures from the histidines in the LH2. In terms of the 13C isotropic shifts, one corresponds to the neutral form of histidine and the other resembles a positively charged histidine species. 15N-13C double-CP/MAS NMR data provide evidence that the electronic structure of the histidines in the neutral BChl a/His complexes resembles the positive charge character form. While the Mg...15N isotropic shift confirms a partial positive charge transfer, its anisotropy is essentially of the lone pair type. This provides evidence that the hybridization structure corresponding to the neutral form of the imidazole is capable of "buffering" a significant amount of positive charge.
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Dahlbom M, Pullerits T, Mukamel S, Sundström V. Exciton Delocalization in the B850 Light-Harvesting Complex: Comparison of Different Measures. J Phys Chem B 2001. [DOI: 10.1021/jp004496i] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Dahlbom
- Department of Chemical Physics, Lund University, Box 124, 211 00 Lund, Sweden, and Department of Chemistry, University of Rochester, Rochester, New York 14627
| | - T. Pullerits
- Department of Chemical Physics, Lund University, Box 124, 211 00 Lund, Sweden, and Department of Chemistry, University of Rochester, Rochester, New York 14627
| | - S. Mukamel
- Department of Chemical Physics, Lund University, Box 124, 211 00 Lund, Sweden, and Department of Chemistry, University of Rochester, Rochester, New York 14627
| | - V. Sundström
- Department of Chemical Physics, Lund University, Box 124, 211 00 Lund, Sweden, and Department of Chemistry, University of Rochester, Rochester, New York 14627
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Kropacheva TN, Hoff AJ. Electrochemical Oxidation of Bacteriochlorophyll a in Reaction Centers and Antenna Complexes of Photosynthetic Bacteria. J Phys Chem B 2001. [DOI: 10.1021/jp003381b] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatyana N. Kropacheva
- Chemistry Department, Udmurt State University, 426037 Izhevsk, Russia, and Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA, Leiden, The Netherlands
| | - Arnold J. Hoff
- Chemistry Department, Udmurt State University, 426037 Izhevsk, Russia, and Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA, Leiden, The Netherlands
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Ketelaars M, van Oijen AM, Matsushita M, Köhler J, Schmidt J, Aartsma TJ. Spectroscopy on the B850 band of individual light-harvesting 2 complexes of Rhodopseudomonas acidophila. I. Experiments and Monte Carlo simulations. Biophys J 2001; 80:1591-603. [PMID: 11222320 PMCID: PMC1301351 DOI: 10.1016/s0006-3495(01)76132-2] [Citation(s) in RCA: 149] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
The electronic structure of the circular aggregate of 18 bacteriochlorophyll a (BChl a) molecules responsible for the B850 absorption band of the light-harvesting 2 (LH2) complex of the photosynthetic purple bacterium Rhodopseudomonas acidophila has been studied by measuring fluorescence-excitation spectra of individual complexes at 1.2 K. The spectra reveal several well-resolved bands that are obscured in the single, broad B850 band observed in conventional absorption measurements on bulk samples. They are interpreted consistently in terms of the exciton model for the circular aggregate of BChl a molecules. From the energy separation between the different exciton transitions a reliable value of the intermolecular interaction is obtained. The spectra of the individual complexes allow for a distinction between the intra- and the intercomplex disorder. In addition to the random disorder, a regular modulation of the interaction has to be assumed to account for all the features of the observed spectra. This modulation has a C(2) symmetry, which strongly suggests a structural deformation of the ring into an ellipse.
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Affiliation(s)
- M Ketelaars
- Department of Biophysics, Huygens Laboratory, Leiden University, 2300 RA Leiden, The Netherlands.
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28
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Salverda JM, van Mourik F, van der Zwan G, van Grondelle R. Energy Transfer in the B800 Rings of the Peripheral Bacterial Light-Harvesting Complexes of Rhodopseudomonas Acidophila and Rhodospirillum Molischianum Studied with Photon Echo Techniques. J Phys Chem B 2000. [DOI: 10.1021/jp002034z] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jante M. Salverda
- Department of Biophysics and Physics of Complex Systems, VU Amsterdam, The Netherlands, Institut de Physique de la Matière Condensée, Faculté des Sciences, BSP, Université de Lausanne, Switzerland, and Department of Analytical Chemistry and Applied Spectroscopy, Faculty of Exact Sciences, VU Amsterdam, The Netherlands
| | - Frank van Mourik
- Department of Biophysics and Physics of Complex Systems, VU Amsterdam, The Netherlands, Institut de Physique de la Matière Condensée, Faculté des Sciences, BSP, Université de Lausanne, Switzerland, and Department of Analytical Chemistry and Applied Spectroscopy, Faculty of Exact Sciences, VU Amsterdam, The Netherlands
| | - Gert van der Zwan
- Department of Biophysics and Physics of Complex Systems, VU Amsterdam, The Netherlands, Institut de Physique de la Matière Condensée, Faculté des Sciences, BSP, Université de Lausanne, Switzerland, and Department of Analytical Chemistry and Applied Spectroscopy, Faculty of Exact Sciences, VU Amsterdam, The Netherlands
| | - Rienk van Grondelle
- Department of Biophysics and Physics of Complex Systems, VU Amsterdam, The Netherlands, Institut de Physique de la Matière Condensée, Faculté des Sciences, BSP, Université de Lausanne, Switzerland, and Department of Analytical Chemistry and Applied Spectroscopy, Faculty of Exact Sciences, VU Amsterdam, The Netherlands
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29
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Book LD, Ostafin AE, Ponomarenko N, Norris JR, Scherer NF. Exciton Delocalization and Initial Dephasing Dynamics of Purple Bacterial LH2. J Phys Chem B 2000. [DOI: 10.1021/jp000485d] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- L. D. Book
- Department of Chemistry, the James Franck Institute and the Institute for Biophysical Dynamics, 5735 S. Ellis Avenue, University of Chicago, Chicago, Illinois 60637
| | - A. E. Ostafin
- Department of Chemistry, the James Franck Institute and the Institute for Biophysical Dynamics, 5735 S. Ellis Avenue, University of Chicago, Chicago, Illinois 60637
| | - N. Ponomarenko
- Department of Chemistry, the James Franck Institute and the Institute for Biophysical Dynamics, 5735 S. Ellis Avenue, University of Chicago, Chicago, Illinois 60637
| | - J. R. Norris
- Department of Chemistry, the James Franck Institute and the Institute for Biophysical Dynamics, 5735 S. Ellis Avenue, University of Chicago, Chicago, Illinois 60637
| | - N. F. Scherer
- Department of Chemistry, the James Franck Institute and the Institute for Biophysical Dynamics, 5735 S. Ellis Avenue, University of Chicago, Chicago, Illinois 60637
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30
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van Oijen AM, Ketelaars M, Köhler J, Aartsma TJ, Schmidt J. Spectroscopy of individual light-harvesting 2 complexes of Rhodopseudomonas acidophila: diagonal disorder, intercomplex heterogeneity, spectral diffusion, and energy transfer in the B800 band. Biophys J 2000; 78:1570-7. [PMID: 10692341 PMCID: PMC1300754 DOI: 10.1016/s0006-3495(00)76709-9] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
This paper reports a detailed spectroscopic study of the B800 absorption band of individual light-harvesting 2 (LH2) complexes of the photosynthetic purple bacterium Rhodopseudomonas acidophila at 1. 2 K. By applying single-molecule detection techniques to this system, details and properties can be revealed that remain obscured in conventional ensemble experiments. For instance, from fluorescence-excitation spectra of the individual complexes a more direct measure of the diagonal disorder could be obtained. Further spectral diffusion phenomena and homogeneous linewidths of individual bacteriochlorophyll a (BChl a) molecules are observed, revealing valuable information on excited-state dynamics. This work demonstrates that it is possible to obtain detailed spectral information on individual pigment-protein complexes, providing direct insight into their electronic structure and into the mechanisms underlying the highly efficient energy transfer processes in these systems.
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Affiliation(s)
- A M van Oijen
- Centre for the Study of Excited States of Molecules, Huygens Laboratory, Leiden University, 2300 RA Leiden, the Netherlands.
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31
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Scholes GD, Fleming GR. On the Mechanism of Light Harvesting in Photosynthetic Purple Bacteria: B800 to B850 Energy Transfer. J Phys Chem B 2000. [DOI: 10.1021/jp993435l] [Citation(s) in RCA: 370] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gregory D. Scholes
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460
| | - Graham R. Fleming
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460
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32
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Polívka T, Pullerits T, Herek JL, Sundström V. Exciton Relaxation and Polaron Formation in LH2 at Low Temperature. J Phys Chem B 2000. [DOI: 10.1021/jp9915984] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tomáš Polívka
- Chemical Physics, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Tõnu Pullerits
- Chemical Physics, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Jennifer L. Herek
- Chemical Physics, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Villy Sundström
- Chemical Physics, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
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33
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Heřman P, Barvík I. Computer Simulation of the Exciton Transfer in the Coupled Ring Antenna Subunits of Bacteria Photosynthetic Systems. J Phys Chem B 1999. [DOI: 10.1021/jp9908855] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pavel Heřman
- Department of Physics, University of Education, V. Nejedlého 573, 50003 Hradec Králové, Czech Republic
| | - Ivan Barvík
- Institute of Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech Republic
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34
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Vulto SIE, de Baat MA, Neerken S, Nowak FR, van Amerongen H, Amesz J, Aartsma TJ. Excited State Dynamics in FMO Antenna Complexes from Photosynthetic Green Sulfur Bacteria: A Kinetic Model. J Phys Chem B 1999. [DOI: 10.1021/jp984702a] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simone I. E. Vulto
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Michiel A. de Baat
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Sieglinde Neerken
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Frank R. Nowak
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Herbert van Amerongen
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Jan Amesz
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Thijs J. Aartsma
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, and Biophysics Department, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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35
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van Oijen A, Ketelaars M, Köhler J, Aartsma T, Schmidt J. Spectroscopy of individual LH2 complexes of Rhodopseudomonas acidophila: localized excitations in the B800 band. Chem Phys 1999. [DOI: 10.1016/s0301-0104(99)00105-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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36
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Novoderezhkin V, Monshouwer R, van Grondelle R. Disordered exciton model for the core light-harvesting antenna of Rhodopseudomonas viridis. Biophys J 1999; 77:666-81. [PMID: 10423416 PMCID: PMC1300362 DOI: 10.1016/s0006-3495(99)76922-5] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In this work we explain the spectral heterogeneity of the absorption band (. Biochim. Biophys. Acta. 1229:373-380), as well as the spectral evolution of pump-probe spectra for membranes of Rhodopseudomonas (Rps.) viridis. We propose an exciton model for the LH1 antenna of Rps. viridis and assume that LH1 consists of 24-32 strongly coupled BChl b molecules that form a ring-like structure with a 12- or 16-fold symmetry. The orientations and pigment-pigment distances of the BChls were taken to be the same as for the LH2 complexes of BChl a-containing bacteria. The model gave an excellent fit to the experimental results. The amount of energetic disorder necessary to explain the results could be precisely estimated and gave a value of 440-545 cm(-1) (full width at half-maximum) at low temperature and 550-620 cm(-1) at room temperature. Within the context of the model we calculated the coherence length of the steady-state exciton wavepacket to correspond to a delocalization over 5-10 BChl molecules at low temperature and over 4-6 molecules at room temperature. Possible origins of the fast electronic dephasing and the observed long-lived vibrational coherence are discussed.
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Affiliation(s)
- V Novoderezhkin
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow 119899, Russia
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37
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Ketelaars M, Kohler J, Aartsma TJ, Schmidt J. Unraveling the electronic structure of individual photosynthetic pigment-protein complexes. Science 1999; 285:400-2. [PMID: 10411501 DOI: 10.1126/science.285.5426.400] [Citation(s) in RCA: 470] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Low-temperature single-molecule spectroscopic techniques were applied to a light-harvesting pigment-protein complex (LH2) from purple photosynthetic bacteria. The properties of the electronically excited states of the two circular assemblies (B800 and B850) of bacteriochlorophyll a (BChl a) pigment molecules in the individual complexes were revealed, without ensemble averaging. The results show that the excited states of the B800 ring of pigments are mainly localized on individual BChl a molecules. In contrast, the absorption of a photon by the B850 ring can be consistently described in terms of an excitation that is completely delocalized over the ring. This property may contribute to the high efficiency of energy transfer in these photosynthetic complexes.
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38
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Sundström V, Pullerits T, van Grondelle R. Photosynthetic Light-Harvesting: Reconciling Dynamics and Structure of Purple Bacterial LH2 Reveals Function of Photosynthetic Unit. J Phys Chem B 1999. [DOI: 10.1021/jp983722+] [Citation(s) in RCA: 672] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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Scholes GD, Gould IR, Cogdell RJ, Fleming GR. Ab Initio Molecular Orbital Calculations of Electronic Couplings in the LH2 Bacterial Light-Harvesting Complex of Rps. Acidophila. J Phys Chem B 1999. [DOI: 10.1021/jp9839753] [Citation(s) in RCA: 167] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gregory D. Scholes
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460
| | - Ian R. Gould
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460
| | - Richard J. Cogdell
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460
| | - Graham R. Fleming
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460
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40
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Vulto SIE, Kennis JTM, Streltsov AM, Amesz J, Aartsma TJ. Energy Relaxation within the B850 Absorption Band of the Isolated Light-Harvesting Complex LH2 from Rhodopseudomonas Acidophila at Low Temperature. J Phys Chem B 1999. [DOI: 10.1021/jp9825415] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simone I. E. Vulto
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - John T. M. Kennis
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Alexander M. Streltsov
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Jan Amesz
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Thijs J. Aartsma
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
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41
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Barvı́k I, Warns C, Neidlinger T, Reineker P. Simulation of excitonic optical line shapes of cyclic molecular aggregates with 9 and 18 units: influence of quasi-static and dynamic disorder. Chem Phys 1999. [DOI: 10.1016/s0301-0104(98)00372-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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42
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Vulto SIE, Neerken S, Louwe RJW, de Baat MA, Amesz J, Aartsma TJ. Excited-State Structure and Dynamics in FMO Antenna Complexes from Photosynthetic Green Sulfur Bacteria. J Phys Chem B 1998. [DOI: 10.1021/jp983003v] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simone I. E. Vulto
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Sieglinde Neerken
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Robert J. W. Louwe
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Michiel A. de Baat
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Jan Amesz
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Thijs J. Aartsma
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
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43
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van Oijen AM, Ketelaars M, Köhler J, Aartsma TJ, Schmidt J. Spectroscopy of Single Light-Harvesting Complexes from Purple Photosynthetic Bacteria at 1.2 K. J Phys Chem B 1998. [DOI: 10.1021/jp9830629] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. M. van Oijen
- Centre for the Study of Excited States of Molecules, and Department of Biophysics, Huygens Laboratory, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - M. Ketelaars
- Centre for the Study of Excited States of Molecules, and Department of Biophysics, Huygens Laboratory, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - J. Köhler
- Centre for the Study of Excited States of Molecules, and Department of Biophysics, Huygens Laboratory, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - T. J. Aartsma
- Centre for the Study of Excited States of Molecules, and Department of Biophysics, Huygens Laboratory, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - J. Schmidt
- Centre for the Study of Excited States of Molecules, and Department of Biophysics, Huygens Laboratory, University of Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands
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44
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Westerhuis WH, Vos M, van Grondelle R, Amesz J, Niederman RA. Altered organization of light-harvesting complexes in phospholipid-enriched Rhodobacter sphaeroides chromatophores as determined by fluorescence yield and singlet-singlet annihilation measurements. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1998. [DOI: 10.1016/s0005-2728(98)00132-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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45
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Kumble R, Hochstrasser RM. Disorder-induced exciton scattering in the light-harvesting systems of purple bacteria: Influence on the anisotropy of emission and band→band transitions. J Chem Phys 1998. [DOI: 10.1063/1.476924] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Savikhin S, Buck DR, Struve WS. Toward Level-to-Level Energy Transfers in Photosynthesis: The Fenna−Matthews−Olson Protein. J Phys Chem B 1998. [DOI: 10.1021/jp981186f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergei Savikhin
- Ames LaboratoryUSDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011
| | - Daniel R. Buck
- Ames LaboratoryUSDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011
| | - Walter S. Struve
- Ames LaboratoryUSDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011
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47
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Monshouwer R, Baltuška A, van Mourik F, van Grondelle R. Time-Resolved Absorption Difference Spectroscopy of the LH-1 Antenna of Rhodopseudomonas viridis. J Phys Chem A 1998. [DOI: 10.1021/jp980412i] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- René Monshouwer
- Department of Physics and Astronomy, Free University of Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Andrius Baltuška
- Department of Physics and Astronomy, Free University of Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Frank van Mourik
- Department of Physics and Astronomy, Free University of Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Rienk van Grondelle
- Department of Physics and Astronomy, Free University of Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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