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Cherepanov DA, Milanovsky GE, Neverov KV, Obukhov YN, Maleeva YV, Aybush AV, Kritsky MS, Nadtochenko VA. Exciton interactions of chlorophyll tetramer in water-soluble chlorophyll-binding protein BoWSCP. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 309:123847. [PMID: 38217986 DOI: 10.1016/j.saa.2024.123847] [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: 07/31/2023] [Revised: 01/02/2024] [Accepted: 01/03/2024] [Indexed: 01/15/2024]
Abstract
The exciton interaction of four chlorophyll a (Chl a) molecules in a symmetrical tetrameric complex of the water-soluble chlorophyll-binding protein BoWSCP was analyzed in the pH range of 3-11. Exciton splitting ΔE = 232 ± 2 cm-1 of the Qy band of Chl a into two subcomponents with relative intensities of 78.1 ± 0.7 % and 21.9 ± 0.7 % was determined by a joint decomposition of the absorption and circular dichroism spectra into Gaussian functions. The exciton coupling parameters were calculated based on the BoWSCP atomic structure in three approximations: the point dipole model, the distributed atomic monopoles, and direct ab initio calculations in the TDDFT/PCM approximation. The Coulomb interactions of monomers were calculated within the continuum model using three values of optical permittivity. The models based on the properties of free Chl a in solution suffer from significant errors both in estimating the absolute value of the exciton interaction and in the relative intensity of exciton transitions. Calculations within the TDDFT/PCM approximation reproduce the experimentally determined parameters of the exciton splitting and the relative intensities of the exciton bands. The following factors of pigment-protein and pigment-pigment interactions were examined: deviation of the macrocycle geometry from the planar conformation of free Chl; the formation of hydrogen bonds between the macrocycle and water molecules; the overlap of wave functions of monomers at close distances. The most significant factor is the geometrical deformation of the porphyrin macrocycle, which leads to an increase in the dipole moment of Chl monomer from 5.5 to 6.9 D and to a rotation of the dipole moment by 15° towards the cyclopentane ring. The contributions of resonant charge-transfer states to the wave functions of the Chl dimer were determined and the transition dipole moments of the symmetric and antisymmetric charge-transfer states were estimated.
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Affiliation(s)
- D A Cherepanov
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Kosygina str., 4, Russian Federation; A.N. Belozersky Institute Of Physico-Chemical Biology, Moscow State University, 119992 Moscow, Leninskye gory, 1b.40, Russian Federation.
| | - G E Milanovsky
- A.N. Belozersky Institute Of Physico-Chemical Biology, Moscow State University, 119992 Moscow, Leninskye gory, 1b.40, Russian Federation
| | - K V Neverov
- A.N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology", Russian Academy of Sciences", 119071 Moscow, Leninsky prospect, 33b.2, Russian Federation; Faculty of Biology, Moscow State University, 119234 Moscow, Leninskye gory, 1b.12, Russian Federation
| | - Yu N Obukhov
- A.N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology", Russian Academy of Sciences", 119071 Moscow, Leninsky prospect, 33b.2, Russian Federation
| | - Yu V Maleeva
- Faculty of Biology, Moscow State University, 119234 Moscow, Leninskye gory, 1b.12, Russian Federation
| | - A V Aybush
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Kosygina str., 4, Russian Federation
| | - M S Kritsky
- A.N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology", Russian Academy of Sciences", 119071 Moscow, Leninsky prospect, 33b.2, Russian Federation
| | - V A Nadtochenko
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Kosygina str., 4, Russian Federation; Department of Chemistry, Moscow State University, 119991 Moscow, Leninskye gory, 1b.3, Russian Federation
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Frackowiak D, Bauman D, Manikowski H, Browett WR, Stillman MJ. Circular dichroism and magnetic circular dichroism spectra of chlorophylls a and b in nematic liquid crystals. II. Magnetic circular dichroism spectra. Biophys Chem 2008; 28:101-14. [PMID: 17010293 DOI: 10.1016/0301-4622(87)80079-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/1987] [Revised: 07/22/1987] [Accepted: 07/23/1987] [Indexed: 11/24/2022]
Abstract
Absorption and magnetic circular dichroism (MCD) spectra are reported for chlorophyll (Chl) a and Chl b dissolved in nematic liquid crystal solvents. The spectra were measured with the dye molecules oriented uniaxially along the direction of. the magnetic field and measuring light beam. It is significant that under such conditions the MCD spectra recorded in the wavelength region of the Q and Soret bands of the chlorophyll are essentially unchanged with respect to rotation of the sample cell around this axis, even though there is almost complete orientation of the chlorophyll molecules by the liquid crystals. The MCD spectra of Chl a and b in the nematic liquid crystal solvents used in this study are surprisingly similar to the spectra obtained under isotropic conditions. These results illustrate an important technique with which to examine the optical spectra of dyes oriented in liquid crystal matrices in which the anisotropic effects can be reduced the negligible proportions by the application of a strong magnetic field parallel to the direction of the measuring light beam. The first deconvolution calculations are reported that describe the deconvolution of pairs of absorption and MCD spectra, in the Q and B band regions, for both Chl a and b. The spectral analysis to obtain quantitative estimates of transition energies was accomplished by carrying out detailed deconvolution calculations in which the both the absorption and MCD spectral envelopes were fitted with the same number of components; each pair of components had the same hand centres and bandwidth values. This procedure resulted in an assignment of each of the main transitions in the absorption spectra of both Chl a and b. Chl a is clearly monomeric, with Qy, Qx, By and Bx located at 671, 582, 439 and 431 nm, respectively. Analysis of the spectral data for Chl b located Qy, By and Bx, at 662, 476 and 464 nm, respectively.
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Affiliation(s)
- D Frackowiak
- Institute of Physics, Poznan Technical University, Piotrowo 3, 60-965 Poznan, Poland
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Gibasiewicz K, Ramesh VM, Lin S, Redding K, Woodbury NW, Webber AN. Two equilibration pools of chlorophylls in the Photosystem I core antenna of Chlamydomonas reinhardtii. PHOTOSYNTHESIS RESEARCH 2007; 92:55-63. [PMID: 17611814 DOI: 10.1007/s11120-006-9125-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2006] [Accepted: 12/11/2006] [Indexed: 05/16/2023]
Abstract
Femtosecond transient absorption spectroscopy was applied for a comparative study of excitation decay in several different Photosystem I (PSI) core preparations from the green alga Chlamydomonas reinhardtii. For PSI cores with a fully interconnected network of chlorophylls, the excitation energy was equilibrated over a pool of chlorophylls absorbing at approximately 683 nm, independent of excitation wavelength [Gibasiewicz et al. J Phys Chem B 105:11498-11506, 2001; J Phys Chem B 106:6322-6330, 2002]. In preparations with impaired connectivity between chlorophylls, we have found that the spectrum of chlorophylls connected to the reaction center (i.e., with approximately 20 ps decay time) over which the excitation is equilibrated becomes excitation-wavelength-dependent. Excitation at 670 nm is finally equilibrated over chlorophylls absorbing at approximately 675 nm, whereas excitation at 695 nm or 700 nm is equilibrated over chlorophylls absorbing at approximately 683 nm. This indicates that in the vicinity of the reaction center there are two spectrally different and spatially separated pools of chlorophylls that are equally capable of effective excitation energy transfer to the reaction center. We propose that they are related to the two groups of central PSI core chlorophylls lying on the opposite sides of reaction center.
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Affiliation(s)
- Krzysztof Gibasiewicz
- School of Life Sciences, Department of Chemistry and Biochemistry and Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, AZ 85287-4501, USA.
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Hughes JL, Razeghifard R, Logue M, Oakley A, Wydrzynski T, Krausz E. Magneto-Optic Spectroscopy of a Protein Tetramer Binding Two Exciton-Coupled Chlorophylls. J Am Chem Soc 2006; 128:3649-58. [PMID: 16536537 DOI: 10.1021/ja056576b] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In vitro chlorophyll (Chl) aggregates have often served as models for in vivo forms of long-wavelength Chl. However, the interaction of protein-bound Chl molecules is typically different than that occurring in solvent-based self-aggregates. We have chosen a water-soluble Chl-binding protein (WSCP) from cauliflower in order to help characterize the spectroscopic properties of Chl in a single well-defined native environment and also to study the pigment-pigment (exciton) interactions present in assemblies of this protein. WSCP forms tetrameric units upon binding two Chl molecules. We present the absorption, circular dichroism (CD), magnetic circular dichroism (MCD), and emission spectra at 1.7 K of recombinant WSCP tetramers containing either Chl a or Chl d. The spectroscopic characteristics provide evidence for significant exciton interaction between equivalent Chl molecules. Our simple exciton analysis allows an estimate of the molecular geometry of the dimer, which is predicted to have an "open sandwich"-type structure. We find that the ratio of the magnetic circular dichroism to absorption, deltaA/A, is substantially increased (approximately 60%) for Chl a in this system compared to its value in solution. This increase is in marked contrast to substantial reductions (>50%) of deltaA/A seen in solvent-based Chl aggregates and in photosynthetic reaction centers. Current theoretical models are unable to account for such large variations in the MCD to absorption ratio for Chl. We propose that spectroscopic studies of WSCP mutants will enable a fundamental understanding of Chl-Chl and Chl-protein interactions.
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Affiliation(s)
- Joseph L Hughes
- Research School of Chemistry, The Australian National University, Canberra, ACT 0200, Australia.
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Gibasiewicz K, Ramesh VM, Lin S, Redding K, Woodbury NW, Webber AN. Excitonic interactions in wild-type and mutant PSI reaction centers. Biophys J 2004; 85:2547-59. [PMID: 14507717 PMCID: PMC1303478 DOI: 10.1016/s0006-3495(03)74677-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Femtosecond excitation of the red edge of the chlorophyll a Q(Y) transition band in photosystem I (PSI), with light of wavelength > or = 700 nm, leads to wide transient (subpicosecond) absorbance changes: positive DeltaA between 635 and 665 nm, and four negative DeltaA bands at 667, 675, 683, and 695 nm. Here we compare the transient absorbance changes after excitation at 700, 705, and 710 nm at 20 K in several PSI preparations of Chlamydomonas reinhardtii where amino acid ligands of the primary donor, primary acceptor, or connecting chlorophylls have been mutated. Most of these mutations influence the spectrum of the absorbance changes. This supports the view that the chlorophylls of the electron transfer chain as well as the connecting chlorophylls are engaged in the observed absorbance changes. The wide absorption spectrum of the electron transfer chain revealed by the transient measurements may contribute to the high efficiency of energy trapping in photosystem 1. Exciton calculations, based on the recent PSI structure, allow an assignment of the DeltaA bands to particular chlorophylls: the bands at 675 and 695 nm to the dimers of primary acceptor and accessory chlorophyll and the band at 683 nm to the connecting chlorophylls. The subpicosecond transient absorption bands decay may reflect rapid charge separation in the PSI reaction center.
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Affiliation(s)
- Krzysztof Gibasiewicz
- Department of Plant Biology and Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona 85287-1601 USA
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Abstract
Measurements of dipole strengths of chlorophylls in solution are reviewed and correlated. The refractive index dependence is found to be expressible in a simple empirical fashion that does not rely on the concept of vacuum dipole strength. The index dependence in some respects contradicts the dependence expected on the basis of effective field theories.
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Affiliation(s)
- Robert S Knox
- Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171, USA.
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Byrdin M, Jordan P, Krauss N, Fromme P, Stehlik D, Schlodder E. Light harvesting in photosystem I: modeling based on the 2.5-A structure of photosystem I from Synechococcus elongatus. Biophys J 2002; 83:433-57. [PMID: 12080132 PMCID: PMC1302159 DOI: 10.1016/s0006-3495(02)75181-3] [Citation(s) in RCA: 162] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The structure of photosystem I from the thermophilic cyanobacterium Synechococcus elongatus has been recently resolved by x-ray crystallography to 2.5-A resolution. Besides the reaction center, photosystem I consists also of a core antenna containing 90 chlorophyll and 22 carotenoid molecules. It is their function to harvest solar energy and to transfer this energy to the reaction center (RC) where the excitation energy is converted into a charge separated state. Methods of steady-state optical spectroscopy such as absorption, linear, and circular dichroism have been applied to obtain information on the spectral properties of the complex, whereas transient absorption and fluorescence studies reported in the literature provide information on the dynamics of the excitation energy transfer. On the basis of the structure, the spectral properties and the energy transfer kinetics are simultaneously modeled by application of excitonic coupling theory to reveal relationships between structure and function. A spectral assignment of the 96 chlorophylls is suggested that allows us to reproduce both optical spectra and transfer and emission spectra and lifetimes of the photosystem I complex from S. elongatus. The model calculation allowed to study the influence of the following parameters on the excited state dynamics: the orientation factor, the heterogeneous site energies, the modifications arising from excitonic coupling (redistribution of oscillator strength, energetic splitting, reorientation of transition dipoles), and presence or absence of the linker cluster chlorophylls between antenna and reaction center. For the Förster radius and the intrinsic primary charge separation rate, the following values have been obtained: R(0) = 7.8 nm and k(CS) = 0.9 ps(-1). Variations of these parameters indicate that the excited state dynamics is neither pure trap limited, nor pure transfer (to-the-trap) limited but seems to be rather balanced.
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Affiliation(s)
- Martin Byrdin
- Institut für Experimentalphysik, Freie Universität Berlin, D-14195 Berlin, Germany
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Knox RS, van Amerongen H. Refractive Index Dependence of the Förster Resonance Excitation Transfer Rate. J Phys Chem B 2002. [DOI: 10.1021/jp013927+] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Schubert A, Beenken WJD, Stiel H, Voigt B, Leupold D, Lokstein H. Excitonic coupling of chlorophylls in the plant light-harvesting complex LHC-II. Biophys J 2002; 82:1030-9. [PMID: 11806942 PMCID: PMC1301909 DOI: 10.1016/s0006-3495(02)75462-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Manifestation and extent of excitonic interactions in the red Chl-absorption region (Q(y) band) of trimeric LHC-II were investigated using two complementary nonlinear laser-spectroscopic techniques. Nonlinear absorption of 120-fs pulses indicates an increased absorption cross section in the red wing of the Q(y) band as compared to monomeric Chl a in organic solution. Additionally, the dependence of a nonlinear polarization response on the pump-field intensity was investigated. This approach reveals that one emitting spectral form, characterized by a 2.3(+/-0.8)-fold larger dipole strength than monomeric Chl a, dominates the fluorescence spectrum of LHC-II. Considering available structural and spectroscopic data, these results can be consistently explained assuming the existence of an excitonically coupled dimer located at Chl-bindings sites a2 and b2 (referring to the original notation of W. Nühlbrandt, D.N. Wang, and Y. Fujiyoshi, Nature, 1994, 367:614-621), which must not necessarily correspond to Chls a and b). This fluorescent dimer, terminating the excitation energy-transfer chain of the LHC-II monomeric subunit, is discussed with respect to its relevance for intra- and inter-antenna excitation energy transfer.
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Affiliation(s)
- Axel Schubert
- Humboldt-Universität zu Berlin, Institut für Biologie Plant Physiology, Unter den Linden 6, D-10099 Berlin, Germany.
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van Amerongen H, van Grondelle R. Understanding the Energy Transfer Function of LHCII, the Major Light-Harvesting Complex of Green Plants. J Phys Chem B 2000. [DOI: 10.1021/jp0028406] [Citation(s) in RCA: 309] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Herbert van Amerongen
- Faculty of Sciences, Division of Physics and Astronomy, Department of Biophysics and Physics of Complex Systems, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Rienk van Grondelle
- Faculty of Sciences, Division of Physics and Astronomy, Department of Biophysics and Physics of Complex Systems, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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Alden RG, Johnson E, Nagarajan V, Parson WW, Law CJ, Cogdell RG. Calculations of Spectroscopic Properties of the LH2 Bacteriochlorophyll−Protein Antenna Complex from Rhodopseudomonas acidophila. J Phys Chem B 1997. [DOI: 10.1021/jp970005r] [Citation(s) in RCA: 229] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Electron transfer and arrangement of the redox cofactors in photosystem I. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1997. [DOI: 10.1016/s0005-2728(96)00112-0] [Citation(s) in RCA: 380] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Jennings RC, Bassi R, Zucchelli G. Antenna structure and energy transfer in higher plant photosystems. ELECTRON TRANSFER II 1996. [DOI: 10.1007/3-540-60110-4_5] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Shubin V, Bezsmertnaya I, Karapetyan N. Efficient energy transfer from the long-wavelength antenna chlorophylls to P700 in photosystem I complexes from Spirulina platensis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 1995. [DOI: 10.1016/1011-1344(95)07173-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nagae H, Kuki M, Cogdell RJ, Koyama Y. Shifts of the 1A−g→1B+u electronic absorption of carotenoids in nonpolar and polar solvents. J Chem Phys 1994. [DOI: 10.1063/1.468501] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Garlaschi FM, Zucchelli G, Giavazzi P, Jennings RC. Gaussian band analysis of absorption, fluorescence and photobleaching difference spectra of D1/D2/cytb-559 complex. PHOTOSYNTHESIS RESEARCH 1994; 41:465-473. [PMID: 24310160 DOI: 10.1007/bf02183048] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/1993] [Accepted: 07/18/1994] [Indexed: 06/02/2023]
Abstract
A study of the absorption and fluorescence characteristics of the D1/D2/cytb-559 reaction centre complex of Photosystem II has been carried out by gaussian decomposition of absorption spectra both at room temperature and 72 K and of the room temperature fluorescence spectrum. A five component fit was found in which the absorption and fluorescence sub-bands could be connected by the Stepanov relation. The photobleaching and light-activated degradation in the dark of long wavelength pigments permitted a further characterisation of the absorption bands. The absorption (fluorescence) maxima of the five bands at room temperature are 660 nm (670 nm), 669 nm (675 nm), 675 nm (681 nm), 680 nm (683 nm), 681 nm (689 nm). A novel feature of this analysis is the presence of two approximately isoenergetic absorption bands near 680 nm at room temperature. The narrower one (FWHM=12.5 nm) is attributed to pheophytin while the broader band (FWHM=23 nm) is thought to be P680. The P680 band width is discussed in terms of homogeneous and site inhomogeous band broadening. The P680 fluorescence has a large Stokes shift (≈9 nm) and most fluorescence in the 690-700 nm range is associated with this chromophore.The three accessory pigment bands are broad (FWHM=17-24 nm) and the 660 nm gaussian is largely temperature insensitive thus indicating significant site inhomogeneous broadening.The very slight narrowing of the D1/D2/cytb-559 Qy absorption at crytogenic temperatures is discussed in terms of the coarse spectral inhomogeneity associated with the spectral forms and the apparently large site inhomogeneous broadening of short wavelength accessory pigments.
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Affiliation(s)
- F M Garlaschi
- Centro CNR Biologia Cellulare e Molecolare delle Piante, Dipartimento di Biologia dell'Università di Milano, Via G. Celoria 26, 20133, Milano, Italy
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Nagae H, Kakitani T, Katoh T, Mimuro M. Calculation of the excitation transfer matrix elements between the S2 or S1 state of carotenoid and the S2 or S1 state of bacteriochlorophyll. J Chem Phys 1993. [DOI: 10.1063/1.464555] [Citation(s) in RCA: 109] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Theory of excitation energy transfer in the primary processes of photosynthesis I. General results. Chem Phys 1989. [DOI: 10.1016/0301-0104(89)87094-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Velthuys BR. Spectroscopic characterization of the acceptor state Q−A and the donor state S2 of Photosystem II of spinach in the blue, red and near-infrared. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1988. [DOI: 10.1016/0005-2728(88)90032-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Renge I, Mölder U, Koppel I. Specific and non-specific solvent effects on chlorophyll a visible spectral maxima. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/0584-8539(85)80059-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Scherz A, Parson WW. Exciton interactions in dimers of bacteriochlorophyll and related molecules. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1984. [DOI: 10.1016/0005-2728(84)90128-2] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Connolly JS, Samuel EB, Janzen AF. EFFECTS OF SOLVENT ON THE FLUORESCENCE PROPERTIES OF BACTERIOCHLOROPHYLL a. Photochem Photobiol 1982. [DOI: 10.1111/j.1751-1097.1982.tb04417.x] [Citation(s) in RCA: 137] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yuen MJ, Shipmanj LL, Katz JJ, Hindman JC. ENERGY TRANSFER IN SELF-ASSEMBLED CHLOROPHYLL a SYSTEMS. Photochem Photobiol 1982. [DOI: 10.1111/j.1751-1097.1982.tb04366.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Schaffernicht H, Junge W. ANALYSIS OF THE COMPLEX BAND SPECTRUM OF P700 BASED ON PHOTOSELECTION STUDIES WITH PHOTOSYSTEM I PARTICLES. Photochem Photobiol 1981. [DOI: 10.1111/j.1751-1097.1981.tb08990.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Schaffernicht H, Junge W. ANALYSIS OF THE COMPLEX BAND SPECTRUM OF P700 BASED ON PHOTOSELECTION STUDIES WITH PHOTOSYSTEM I PARTICLES. Photochem Photobiol 1981. [DOI: 10.1111/j.1751-1097.1981.tb09351.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hirayama S, Phillips D. Correction for refractive index in the comparison of radiative lifetimes in vapour and solution phases. ACTA ACUST UNITED AC 1980. [DOI: 10.1016/0047-2670(80)85036-2] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Shuvalov VA, Asadov AA. Arrangement and interaction of pigment molecules in reaction centers of Rhodopseudomonas viridis. Photodichroism and circular dichroism of reaction centers at 100 k. BIOCHIMICA ET BIOPHYSICA ACTA 1979; 545:296-308. [PMID: 760781 DOI: 10.1016/0005-2728(79)90207-x] [Citation(s) in RCA: 84] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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