1
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Amoruso G, Liu J, Polak DW, Tiwari K, Jones MR, Oliver TAA. High-Efficiency Excitation Energy Transfer in Biohybrid Quantum Dot-Bacterial Reaction Center Nanoconjugates. J Phys Chem Lett 2021; 12:5448-5455. [PMID: 34081477 DOI: 10.1021/acs.jpclett.1c01407] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Reaction centers (RCs) are the pivotal component of natural photosystems, converting solar energy into the potential difference between separated electrons and holes that is used to power much of biology. RCs from anoxygenic purple photosynthetic bacteria such as Rhodobacter sphaeroides only weakly absorb much of the visible region of the solar spectrum, which limits their overall light-harvesting capacity. For in vitro applications such as biohybrid photodevices, this deficiency can be addressed by effectively coupling RCs with synthetic light-harvesting materials. Here, we studied the time scale and efficiency of Förster resonance energy transfer (FRET) in a nanoconjugate assembled from a synthetic quantum dot (QD) antenna and a tailored RC engineered to be fluorescent. Time-correlated single-photon counting spectroscopy of biohybrid conjugates enabled the direct determination of FRET from QDs to attached RCs on a time scale of 26.6 ± 0.1 ns and with a high efficiency of 0.75 ± 0.01.
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Affiliation(s)
- Giordano Amoruso
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Juntai Liu
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Daniel W Polak
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Kavita Tiwari
- School of Biochemistry, University of Bristol, Biomedical Sciences Building, University Walk, Bristol BS8 1TD, U.K
| | - Michael R Jones
- School of Biochemistry, University of Bristol, Biomedical Sciences Building, University Walk, Bristol BS8 1TD, U.K
| | - Thomas A A Oliver
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
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2
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Liu J, Mantell J, Di Bartolo N, Jones MR. Mechanisms of Self-Assembly and Energy Harvesting in Tuneable Conjugates of Quantum Dots and Engineered Photovoltaic Proteins. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1804267. [PMID: 30569587 DOI: 10.1002/smll.201804267] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 11/30/2018] [Indexed: 06/09/2023]
Abstract
Photoreaction centers facilitate the solar energy transduction at the heart of photosynthesis and there is increasing interest in their incorporation into biohybrid devices for solar energy conversion, sensing, and other applications. In this work, the self-assembly of conjugates between engineered bacterial reaction centers (RCs) and quantum dots (QDs) that act as a synthetic light harvesting system is described. The interface between protein and QD is provided by a polyhistidine tag that confers a tight and specific binding and defines the geometry of the interaction. Protein engineering that changes the pigment composition of the RC is used to identify Förster resonance energy transfer as the mechanism through which QDs can drive RC photochemistry with a high energy transfer efficiency. A thermodynamic explanation of RC/QD conjugation based on a multiple/independent binding model is provided. It is also demonstrated that the presence of multiple binding sites affects energy coupling not only between RCs and QDs but also among the bound RCs themselves, effects which likely stem from restricted RC dynamics at the QD surface in denser conjugates. These findings are readily transferrable to many other conjugate systems between proteins or combinations of proteins and other nanomaterials.
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Affiliation(s)
- Juntai Liu
- School of Biochemistry Biomedical Sciences Building, University of Bristol, University Walk, Bristol, BS8 1TD, UK
| | - Judith Mantell
- Wolfson Bioimaging Facility, Biomedical Sciences Building, University of Bristol, University Walk, Bristol, BS8 1TD, UK
| | - Natalie Di Bartolo
- School of Biochemistry Biomedical Sciences Building, University of Bristol, University Walk, Bristol, BS8 1TD, UK
| | - Michael R Jones
- School of Biochemistry Biomedical Sciences Building, University of Bristol, University Walk, Bristol, BS8 1TD, UK
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3
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Paleček D, Zigmantas D. Double-crossed polarization transient grating for distinction and characterization of coherences. OPTICS EXPRESS 2018; 26:32900-32907. [PMID: 30645450 DOI: 10.1364/oe.26.032900] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 08/28/2018] [Indexed: 06/09/2023]
Abstract
Coherent phenomena have been widely suggested to play a role in efficient photosynthetic light harvesting and charge separation processes. To substantiate these ideas, separation of intramolecular vibrational coherences from purely electronic or mixed vibronic coherences is essential. To this end, polarization-controlled two-dimensional electronic spectroscopy has been shown to provide an effective selectivity. We show that analogous discrimination can be achieved in a transient grating experiment by employing the double-crossed polarization scheme. This is demonstrated in a study of bacterial reaction centers. Significantly faster acquisition times of these experiments make longer population time scans feasible, thereby achieving improved frequency resolution and allowing for accurate extraction of coherence frequencies and dephasing times. These parameters are crucial for the discussion on relevance of the measured coherences to energy or electron transfer phenomena.
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4
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Ma F, Swainsbury DJK, Jones MR, van Grondelle R. Photoprotection through ultrafast charge recombination in photochemical reaction centres under oxidizing conditions. Philos Trans R Soc Lond B Biol Sci 2018; 372:rstb.2016.0378. [PMID: 28808097 DOI: 10.1098/rstb.2016.0378] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/03/2017] [Indexed: 11/12/2022] Open
Abstract
Engineering natural photosynthesis to address predicted shortfalls in food and energy supply requires a detailed understanding of its molecular basis and the intrinsic photoprotective mechanisms that operate under fluctuating environmental conditions. Long-lived triplet or singlet excited electronic states have the potential to cause photodamage, particularly in the presence of oxygen, and so a variety of mechanisms exist to prevent formation of such states or safely dissipate their energy. Here, we report a dramatic difference in spectral evolution in fully reduced and partially oxidized Rhodobacter sphaeroides reaction centres (RCs) following excitation of the monomeric bacteriochlorophyll (BChl) cofactors at 805 nm. Three types of preparation were studied, including RCs purified as protein/lipid nanodiscs using the copolymer styrene maleic acid. In fully reduced RCs such excitation produces membrane-spanning charge separation. In preparations of partially oxidized RCs the spectroscopic signature of this charge separation is replaced by that of an energy dissipation process, including in the majority sub-population of reduced RCs. This process, which appears to take place on both cofactor branches, involves formation of a BChl+/bacteriopheophytin- radical pair that dissipates energy via recombination to a vibrationally hot ground state. The possible physiological role of this dissipative process under mildly oxidizing conditions is considered.This article is part of the themed issue 'Enhancing photosynthesis in crop plants: targets for improvement'.
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Affiliation(s)
- Fei Ma
- Department of Biophysics, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - David J K Swainsbury
- School of Biochemistry, University of Bristol, Medical Sciences Building, University Walk, Bristol BS8 1TD, UK
| | - Michael R Jones
- School of Biochemistry, University of Bristol, Medical Sciences Building, University Walk, Bristol BS8 1TD, UK
| | - Rienk van Grondelle
- Department of Biophysics, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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5
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Paleček D, Edlund P, Westenhoff S, Zigmantas D. Quantum coherence as a witness of vibronically hot energy transfer in bacterial reaction center. SCIENCE ADVANCES 2017; 3:e1603141. [PMID: 28913419 PMCID: PMC5587020 DOI: 10.1126/sciadv.1603141] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 08/08/2017] [Indexed: 05/25/2023]
Abstract
Photosynthetic proteins have evolved over billions of years so as to undergo optimal energy transfer to the sites of charge separation. On the basis of spectroscopically detected quantum coherences, it has been suggested that this energy transfer is partially wavelike. This conclusion depends critically on the assignment of the coherences to the evolution of excitonic superpositions. We demonstrate that, for a bacterial reaction center protein, long-lived coherent spectroscopic oscillations, which bear canonical signatures of excitonic superpositions, are essentially vibrational excited-state coherences shifted to the ground state of the chromophores. We show that the appearance of these coherences arises from a release of electronic energy during energy transfer. Our results establish how energy migrates on vibrationally hot chromophores in the reaction center, and they call for a reexamination of claims of quantum energy transfer in photosynthesis.
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Affiliation(s)
- David Paleček
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden
- Department of Chemical Physics, Charles University, Ke Karlovu 3, CZ-121 16 Praha 2, Czech Republic
| | - Petra Edlund
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Sebastian Westenhoff
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Donatas Zigmantas
- Department of Chemical Physics, Lund University, Box 124, SE-22100 Lund, Sweden
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6
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Jankowiak R, Rancova O, Chen J, Kell A, Saer RG, Beatty JT, Abramavicius D. Mutation-Induced Changes in the Protein Environment and Site Energies in the (M)L214G Mutant of the Rhodobacter sphaeroides Bacterial Reaction Center. J Phys Chem B 2016; 120:7859-71. [PMID: 27458891 DOI: 10.1021/acs.jpcb.6b06151] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work focuses on the low-temperature (5 K) photochemical (transient) hole-burned (HB) spectra within the P870 absorption band, and their theoretical analysis, for the (M)L214G mutant of the photosynthetic Rhodobacter sphaeroides bacterial reaction center (bRC). To provide insight into system-bath interactions of the bacteriochlorophyll a (BChl a) special pair, i.e., P870, in the mutated bRC, the optical line shape function for the P870 band is calculated numerically. On the basis of the modeling studies, we demonstrate that (M)L214G mutation leads to a heterogeneous population of bRCs with modified (increased) total electron-phonon coupling strength of the special pair BChl a and larger inhomogeneous broadening. Specifically, we show that after mutation in the (M)L214G bRC a large fraction (∼50%) of the bacteriopheophytin (HA) chromophores shifts red and the 800 nm absorption band broadens, while the remaining fraction of HA cofactors retains nearly the same site energy as HA in the wild-type bRC. Modeling using these two subpopulations allowed for fits of the absorption and nonresonant (transient) HB spectra of the mutant bRC in the charge neutral, oxidized, and charge-separated states using the Frenkel exciton Hamiltonian, providing new insight into the mutant's complex electronic structure. Although the average (M)L214G mutant quantum efficiency of P(+)QA(-) state formation seems to be altered in comparison with the wild-type bRC, the average electron transfer time (measured via resonant transient HB spectra within the P870 band) was not affected. Thus, mutation in the vicinity of the electron acceptor (HA) does not tune the charge separation dynamics. Finally, quenching of the (M)L214G mutant excited states by P(+) is addressed by persistent HB spectra burned within the B band in chemically oxidized samples.
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Affiliation(s)
| | - Olga Rancova
- Department of Theoretical Physics, Vilnius University , 10222 Vilnius, Lithuania
| | | | | | - Rafael G Saer
- Department of Microbiology and Immunology, University of British Columbia , Vancouver, BC V6T 1Z3, Canada
| | - J Thomas Beatty
- Department of Microbiology and Immunology, University of British Columbia , Vancouver, BC V6T 1Z3, Canada
| | - Darius Abramavicius
- Department of Theoretical Physics, Vilnius University , 10222 Vilnius, Lithuania
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7
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Chen L, Shenai P, Zheng F, Somoza A, Zhao Y. Optimal Energy Transfer in Light-Harvesting Systems. Molecules 2015; 20:15224-72. [PMID: 26307957 PMCID: PMC6332264 DOI: 10.3390/molecules200815224] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 08/03/2015] [Accepted: 08/14/2015] [Indexed: 01/25/2023] Open
Abstract
Photosynthesis is one of the most essential biological processes in which specialized pigment-protein complexes absorb solar photons, and with a remarkably high efficiency, guide the photo-induced excitation energy toward the reaction center to subsequently trigger its conversion to chemical energy. In this work, we review the principles of optimal energy transfer in various natural and artificial light harvesting systems. We begin by presenting the guiding principles for optimizing the energy transfer efficiency in systems connected to dissipative environments, with particular attention paid to the potential role of quantum coherence in light harvesting systems. We will comment briefly on photo-protective mechanisms in natural systems that ensure optimal functionality under varying ambient conditions. For completeness, we will also present an overview of the charge separation and electron transfer pathways in reaction centers. Finally, recent theoretical and experimental progress on excitation energy transfer, charge separation, and charge transport in artificial light harvesting systems is delineated, with organic solar cells taken as prime examples.
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Affiliation(s)
- Lipeng Chen
- Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue,Singapore 639798, Singapore.
| | - Prathamesh Shenai
- Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue,Singapore 639798, Singapore.
| | - Fulu Zheng
- Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue,Singapore 639798, Singapore.
| | - Alejandro Somoza
- Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue,Singapore 639798, Singapore.
| | - Yang Zhao
- Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue,Singapore 639798, Singapore.
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8
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Ryu IS, Dong H, Fleming GR. Role of Electronic-Vibrational Mixing in Enhancing Vibrational Coherences in the Ground Electronic States of Photosynthetic Bacterial Reaction Center. J Phys Chem B 2014; 118:1381-8. [DOI: 10.1021/jp4100476] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Ian Seungwan Ryu
- Department of Chemistry, University of California—Berkeley, and Physical Bioscience
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Hui Dong
- Department of Chemistry, University of California—Berkeley, and Physical Bioscience
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Graham R. Fleming
- Department of Chemistry, University of California—Berkeley, and Physical Bioscience
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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9
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Zhu J, van Stokkum IHM, Paparelli L, Jones MR, Groot ML. Early bacteriopheophytin reduction in charge separation in reaction centers of Rhodobacter sphaeroides. Biophys J 2014; 104:2493-502. [PMID: 23746522 DOI: 10.1016/j.bpj.2013.04.026] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 04/11/2013] [Accepted: 04/12/2013] [Indexed: 11/16/2022] Open
Abstract
A question at the forefront of biophysical sciences is, to what extent do quantum effects and protein conformational changes play a role in processes such as biological sensing and energy conversion? At the heart of photosynthetic energy transduction lie processes involving ultrafast energy and electron transfers among a small number of tetrapyrrole pigments embedded in the interior of a protein. In the purple bacterial reaction center (RC), a highly efficient ultrafast charge separation takes place between a pair of bacteriochlorophylls: an accessory bacteriochlorophyll (B) and bacteriopheophytin (H). In this work, we applied ultrafast spectroscopy in the visible and near-infrared spectral region to Rhodobacter sphaeroides RCs to accurately track the timing of the electron on BA and HA via the appearance of the BA and HA anion bands. We observed an unexpectedly early rise of the HA⁻ band that challenges the accepted simple picture of stepwise electron transfer with 3 ps and 1 ps time constants. The implications for the mechanism of initial charge separation in bacterial RCs are discussed in terms of a possible adiabatic electron transfer step between BA and HA, and the effect of protein conformation on the electron transfer rate.
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Affiliation(s)
- Jingyi Zhu
- Department of Physics, Faculty of Sciences, VU University Amsterdam, Amsterdam, The Netherlands
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10
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Dong H, Ryu IS, Fleming GR. Pseudo-rephasing and pseudo-free-induction-decay mechanism in two-color three-pulse photon echo of a binary system. J Phys Chem B 2013; 117:16416-21. [PMID: 24283795 DOI: 10.1021/jp409352z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We investigate the two-color three-pulse photon echo peak shift in a (left-right) binary system, where each component consists of a heterodimer. On the basis of the model, we find that the effect of the excitonic asymmetry between two components leads to an additional factor in the peak shift. A pseudo-rephasing and pseudo-free-induction-decay mechanism is proposed to explain the resultant negative peak shift, when the differences between the two left/right components have the opposite sign. In such a case, estimates of the electronic coupling strength via two- and one-color peak shift experiments lead to an underestimate of the coupling magnitude.
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Affiliation(s)
- Hui Dong
- Department of Chemistry, University of California , Berkeley, California 94720, United States
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11
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Westenhoff S, Palec̆ek D, Edlund P, Smith P, Zigmantas D. Coherent Picosecond Exciton Dynamics in a Photosynthetic Reaction Center. J Am Chem Soc 2012; 134:16484-7. [DOI: 10.1021/ja3065478] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sebastian Westenhoff
- Department of Chemistry and
Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - David Palec̆ek
- Department of Chemical Physics, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
| | - Petra Edlund
- Department of Chemistry and
Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Philip Smith
- Department of Chemistry and
Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Donatas Zigmantas
- Department of Chemical Physics, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
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12
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Schlau-Cohen GS, De Re E, Cogdell RJ, Fleming GR. Determination of Excited-State Energies and Dynamics in the B Band of the Bacterial Reaction Center with 2D Electronic Spectroscopy. J Phys Chem Lett 2012; 3:2487-92. [PMID: 26292138 DOI: 10.1021/jz300841u] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Photosynthetic organisms convert photoenergy to chemical energy with near-unity quantum efficiency. This occurs through charge transfer in the reaction center, which consists of two branches of pigments. In bacteria, both branches are energy-transfer pathways, but only one is also an electron transfer pathway. One barrier to a full understanding of the asymmetry is that the two branches contain excited states close in energy that produce overlapping spectroscopic peaks. We apply polarization-dependent, 2D electronic spectroscopy to the B band of the oxidized bacterial reaction center. The spectra reveal two previously unresolved peaks, corresponding to excited states localized on each of the two branches. Furthermore, a previously unknown interaction between these two states is observed on a time scale of ∼100 fs. This may indicate an alternative pathway to electron transfer for the oxidized reaction center and thus may be a mechanism to prevent energy from becoming trapped in local minima.
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Affiliation(s)
- Gabriela S Schlau-Cohen
- §Physical Biosciences Division, Lawrence Berkeley National Lab, Berkeley, California, United States
| | - Eleonora De Re
- §Physical Biosciences Division, Lawrence Berkeley National Lab, Berkeley, California, United States
| | | | - Graham R Fleming
- §Physical Biosciences Division, Lawrence Berkeley National Lab, Berkeley, California, United States
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13
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Pan J, Lin S, Woodbury NW. Bacteriochlorophyll Excited-State Quenching Pathways in Bacterial Reaction Centers with the Primary Donor Oxidized. J Phys Chem B 2012; 116:2014-22. [DOI: 10.1021/jp212441b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jie Pan
- The Biodesign
Institute at Arizona
State University, Arizona State University, Tempe, Arizona 85287-5201, United States
| | - Su Lin
- The Biodesign
Institute at Arizona
State University, Arizona State University, Tempe, Arizona 85287-5201, United States
- Department of Chemistry and
Biochemistry, Arizona State University,
Tempe, Arizona 85287-1604, United States
| | - Neal W. Woodbury
- The Biodesign
Institute at Arizona
State University, Arizona State University, Tempe, Arizona 85287-5201, United States
- Department of Chemistry and
Biochemistry, Arizona State University,
Tempe, Arizona 85287-1604, United States
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14
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Leonova MM, Fufina TY, Vasilieva LG, Shuvalov VA. Structure-function investigations of bacterial photosynthetic reaction centers. BIOCHEMISTRY (MOSCOW) 2012; 76:1465-83. [DOI: 10.1134/s0006297911130074] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Pan J, Lin S, Allen JP, Williams JC, Frank HA, Woodbury NW. Carotenoid Excited-State Properties in Photosynthetic Purple Bacterial Reaction Centers: Effects of the Protein Environment. J Phys Chem B 2011; 115:7058-68. [DOI: 10.1021/jp200077e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jie Pan
- The Biodesign Institute at Arizona State University, Arizona State University, Tempe, Arizona 85287-5201, United States
| | - Su Lin
- The Biodesign Institute at Arizona State University, Arizona State University, Tempe, Arizona 85287-5201, United States
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - James P. Allen
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - JoAnn C. Williams
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Harry A. Frank
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Neal W. Woodbury
- The Biodesign Institute at Arizona State University, Arizona State University, Tempe, Arizona 85287-5201, United States
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
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16
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Williams JC, Allen JP. Directed Modification of Reaction Centers from Purple Bacteria. THE PURPLE PHOTOTROPHIC BACTERIA 2009. [DOI: 10.1007/978-1-4020-8815-5_18] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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17
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Jones MR. Structural Plasticity of Reaction Centers from Purple Bacteria. THE PURPLE PHOTOTROPHIC BACTERIA 2009. [DOI: 10.1007/978-1-4020-8815-5_16] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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18
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Cheng YC, Lee H, Fleming GR. Efficient Simulation of Three-Pulse Photon-Echo Signals with Application to the Determination of Electronic Coupling in a Bacterial Photosynthetic Reaction Center. J Phys Chem A 2007; 111:9499-508. [PMID: 17696328 DOI: 10.1021/jp0735177] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A time-nonlocal quantum master equation coupled with a perturbative scheme to evaluate the third-order polarization in the phase-matching direction k(s) = -k(1) + k(2) + k(3) is used to efficiently simulate three-pulse photon-echo signals. The present method is capable of describing photon-echo peak shifts including pulse overlap and bath memory effects. In addition, the method treats the non-Markovian evolution of the density matrix and the third-order polarization in a consistent manner, thus is expected to be useful in systems with rapid and complex dynamics. We apply the theoretical method to describe one- and two-color three-pulse photon-echo peak shift experiments performed on a bacterial photosynthetic reaction center and demonstrate that, by properly incorporating the pulse overlap effects, the method can be used to describe simultaneously all peak shift experiments and determine the electronic coupling between the localized Q(y) excitations on the bacteriopheophytin (BPhy) and accessory bateriochlorophyll (BChl) in the reaction center. A value of J = 250 cm(-1) is found for the coupling between BPhy and BChl.
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Affiliation(s)
- Yuan-Chung Cheng
- Department of Chemistry and QB3 Institute, University of California Berkeley, Berkeley, California 94720, USA
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19
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Lee H, Cheng YC, Fleming GR. Coherence Dynamics in Photosynthesis: Protein Protection of Excitonic Coherence. Science 2007; 316:1462-5. [PMID: 17556580 DOI: 10.1126/science.1142188] [Citation(s) in RCA: 593] [Impact Index Per Article: 34.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The role of quantum coherence in promoting the efficiency of the initial stages of photosynthesis is an open and intriguing question. We performed a two-color photon echo experiment on a bacterial reaction center that enabled direct visualization of the coherence dynamics in the reaction center. The data revealed long-lasting coherence between two electronic states that are formed by mixing of the bacteriopheophytin and accessory bacteriochlorophyll excited states. This coherence can only be explained by strong correlation between the protein-induced fluctuations in the transition energy of neighboring chromophores. Our results suggest that correlated protein environments preserve electronic coherence in photosynthetic complexes and allow the excitation to move coherently in space, enabling highly efficient energy harvesting and trapping in photosynthesis.
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Affiliation(s)
- Hohjai Lee
- Department of Chemistry and QB3 Institute, University of California, Berkeley, USA
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20
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Parkinson DY, Lee H, Fleming GR. Measuring Electronic Coupling in the Reaction Center of Purple Photosynthetic Bacteria by Two-Color, Three-Pulse Photon Echo Peak Shift Spectroscopy. J Phys Chem B 2007; 111:7449-56. [PMID: 17530796 DOI: 10.1021/jp070029q] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
One- and two-color, three-pulse photon echo peak shift spectroscopy (1C and 2C3PEPS) was used to estimate the electronic coupling between the accessory bacteriochlorophyll (B) and the bacteriopheophytin (H) in the reaction center of the purple photosynthetic bacterium Rhodobacter sphaeroides as approximately 170 +/- 30 cm-1. This is the first direct experimental determination of this parameter; it is within the range of values found in previously published calculations. The 1C3PEPS signal of the Qy band of the bacteriochlorophyll B shows that it is weakly coupled to nuclear motions of the bath, whereas the 1C3PEPS signal of the Qy band of the bacteriopheophytin, H, shows that it is more strongly coupled to the bath, but has minimal inhomogeneous broadening. Our simulations capture the major features of the data with the theoretical framework developed in our group to separately calculate the response functions and population dynamics.
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Affiliation(s)
- Dilworth Y Parkinson
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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Mikhailyuk IK, Knox PP, Paschenko VZ, Razjivin AP, Lokstein H. Analysis of absorption spectra of purple bacterial reaction centers in the near infrared region by higher order derivative spectroscopy. Biophys Chem 2006; 122:16-26. [PMID: 16513249 DOI: 10.1016/j.bpc.2006.02.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2005] [Revised: 02/09/2006] [Accepted: 02/09/2006] [Indexed: 11/17/2022]
Abstract
Reaction centers (RCs) of purple bacteria are uniquely suited objects to study the mechanisms of the photosynthetic conversion of light energy into chemical energy. A recently introduced method of higher order derivative spectroscopy [I.K. Mikhailyuk, H. Lokstein, A.P. Razjivin, A method of spectral subband decomposition by simultaneous fitting the initial spectrum and a set of its derivatives, J. Biochem. Biophys. Methods 63 (2005) 10-23] was used to analyze the NIR absorption spectra of RC preparations from Rhodobacter (R.) sphaeroides strain 2R and Blastochloris (B.) viridis strain KH, containing bacteriochlorophyll (BChl) a and b, respectively. Q(y) bands of individual RC porphyrin components (BChls and bacteriopheophytins, BPheo) were identified. The results indicate that the upper exciton level P(y+) of the photo-active BChl dimer in RCs of R. sphaeroides has an absorption maximum of 810nm. The blue shift of a complex integral band at approximately 800nm upon oxidation of the RC is caused primarily by bleaching of P(y+), rather than by an electrochromic shift of the absorption band(s) of the monomeric BChls. Likewise, the disappearance of a band peaking at 842nm upon oxidation of RCs from B. viridis indicates that this band has to be assigned to P(y+). A blue shift of an absorption band at approximately 830nm upon oxidation of RCs of B. viridis is also essentially caused by the disappearance of P(y+), rather than by an electrochromic shift of the absorption bands of monomeric BChls. Absorption maxima of the monomeric BChls, B(B) and B(A) are at 802 and 797nm, respectively, in RCs of R. sphaeroides at room temperature. BPheo co-factors H(B) and H(A) peak at 748 and 758nm, respectively, at room temperature. For B. viridis RCs the spectral positions of H(B) and H(A) were found to be 796 and 816nm, respectively, at room temperature.
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Affiliation(s)
- I K Mikhailyuk
- A.N. Belozerski Institute of Physico-Chemical Biology, Biology Faculty of the M.V. Lomonosov Moscow State University, 119992, Moscow, Russia
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Gorokhov VV, Pashchenko VZ, Sarkisov OM, Rubin AB. Spectral and temporal dynamics of transitional processes in the reaction centers of Rhodobacter sphaeroides in the region of 780–830 nm. DOKL BIOCHEM BIOPHYS 2006; 406:40-3. [PMID: 16584005 DOI: 10.1134/s160767290601011x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- V V Gorokhov
- Biological Faculty, Moscow State University, Vorob'evy gory, Moscow 119899 Russia
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Khatypov RA, Vasilieva LG, Fufina TY, Bolgarina TI, Shuvalov VA. Substitution of Isoleucine L177 by Histidine Affects the Pigment Composition and Properties of the Reaction Center of the Purple Bacterium Rhodobacter sphaeroides. BIOCHEMISTRY (MOSCOW) 2005; 70:1256-61. [PMID: 16336186 DOI: 10.1007/s10541-005-0256-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using site-directed mutagenesis, we obtained the mutant of the purple bacterium Rhodobacter sphaeroides with Ile to His substitution at position 177 in the L-subunit of the photosynthetic reaction center (RC). The mutant strain forms stable and photochemically active RC complexes. Relative to the wild type RCs, the spectral and photochemical properties of the mutant RC differ significantly in the absorption regions corresponding to the primary donor P and the monomer bacteriochlorophyll (BChl) absorption. It is shown that the RC I(L177)H contains only three BChl molecules compared to four BChl molecules in the wild type RC. Considering the fact that the properties of both isolated and membrane-associated mutant RCs are similar, we conclude that the loss of a BChl molecule from the mutant RC is caused by the introduced mutation but not by the protein purification procedure. The new mutant missing one BChl molecule but still able to perform light-induced reactions forming the charge-separated state P+QA- appears to be an interesting object to study the mechanisms of the first steps of the primary electron transfer in photosynthesis.
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Affiliation(s)
- R A Khatypov
- Institute of Basic Biological Problems, Pushchino, Moscow Region, 142290, Russia
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Treynor TP, Yoshina-Ishii C, Boxer SG. Probing Excited-State Electron Transfer by Resonance Stark Spectroscopy: 4. Mutations near BL in Photosynthetic Reaction Centers Perturb Multiple Factors that Affect →. J Phys Chem B 2004. [DOI: 10.1021/jp048986c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas P. Treynor
- Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | | | - Steven G. Boxer
- Department of Chemistry, Stanford University, Stanford, California 94305-5080
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Jordanides XJ, Scholes GD, Shapley WA, Reimers JR, Fleming GR. Electronic Couplings and Energy Transfer Dynamics in the Oxidized Primary Electron Donor of the Bacterial Reaction Center. J Phys Chem B 2004. [DOI: 10.1021/jp036516x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xanthipe J. Jordanides
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and School of Chemistry, The University of Sydney, NSW 2006, Australia
| | - Gregory D. Scholes
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and School of Chemistry, The University of Sydney, NSW 2006, Australia
| | - Warwick A. Shapley
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and School of Chemistry, The University of Sydney, NSW 2006, Australia
| | - Jeffrey R. Reimers
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and School of Chemistry, The University of Sydney, NSW 2006, Australia
| | - Graham R. Fleming
- Department of Chemistry, University of California, Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and School of Chemistry, The University of Sydney, NSW 2006, Australia
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King BA, McAnaney TB, de Winter A, Boxer SG. Excited-state energy transfer pathways in photosynthetic reaction centers: 5. Oxidized and triplet excited special pairs as energy acceptors. Chem Phys 2003. [DOI: 10.1016/s0301-0104(03)00318-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Franzen S, Stanley RJ. A theoretical explanation for quantum yield failure in bacterial photosynthetic reaction centers. Chem Phys 2002. [DOI: 10.1016/s0301-0104(01)00582-1] [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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28
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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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Lin S, Jackson JA, Taguchi AKW, Woodbury NW. B-Side Electron Transfer Promoted by Absorbance of Multiple Photons in Rhodobacter sphaeroides R-26 Reaction Centers. J Phys Chem B 1999. [DOI: 10.1021/jp990303j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Su Lin
- Department of Chemistry and Biochemistry and the Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona, 85287-1604
| | - Jonathan A. Jackson
- Department of Chemistry and Biochemistry and the Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona, 85287-1604
| | - Aileen K. W. Taguchi
- Department of Chemistry and Biochemistry and the Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona, 85287-1604
| | - Neal W. Woodbury
- Department of Chemistry and Biochemistry and the Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona, 85287-1604
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30
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Affiliation(s)
- M H Vos
- INSERM U451, Laboratoire d'Optique Appliquée, Ecole Polytechnique-ENSTA, 91761, Palaiseau Cedex, France.
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Lin S, Jackson J, Taguchi AKW, Woodbury NW. Excitation Wavelength Dependent Spectral Evolution in Rhodobacter sphaeroides R-26 Reaction Centers at Low Temperatures: The Qy Transition Region. J Phys Chem B 1998. [DOI: 10.1021/jp980360x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Su Lin
- Department of Chemistry and Biochemistry and the Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona 85287-1604
| | - Jon Jackson
- Department of Chemistry and Biochemistry and the Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona 85287-1604
| | - Aileen K. W. Taguchi
- Department of Chemistry and Biochemistry and the Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona 85287-1604
| | - Neal W. Woodbury
- Department of Chemistry and Biochemistry and the Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona 85287-1604
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