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Chrupková P, van Stokkum IHM, Friedrich T, Moldenhauer M, Budisa N, Tseng HW, Polívka T, Cherepanov DA, Maksimov EG, Kloz M. Raman Vibrational Signatures of Excited States of Echinenone in the Orange Carotenoid Protein (OCP) and Implications for its Photoactivation Mechanism. J Mol Biol 2024:168625. [PMID: 38797429 DOI: 10.1016/j.jmb.2024.168625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 05/09/2024] [Accepted: 05/17/2024] [Indexed: 05/29/2024]
Abstract
In this study, the vibrational characteristics of optically excited echinenone in various solvents and the Orange Carotenoid Protein (OCP) in red and orange states are systematically investigated through steady-state and time-resolved spectroscopy techniques. Time-resolved experiments, employing both Transient Absorption (TA) and Femtosecond Stimulated Raman Spectroscopy (FSRS), reveal different states in the OCP photoactivation process. The time-resolved studies indicate vibrational signatures of exited states positioned above the S1 state during the initial 140 fs of carotenoid evolution in OCP, an absence of a vibrational signature for the relaxed S1 state of echinenone in OCP, and more robust signatures of a highly excited ground state (GS) in OCP. Differences in S1 state vibration population signatures between OCP and solvents are attributed to distinct conformations of echinenone in OCP and hydrogen bonds at the keto group forming a short-lived intramolecular charge transfer (ICT) state. The vibrational dynamics of the hot GS in OCP show a more pronounced red shift of ground state CC vibration compared to echinenone in solvents, thus suggesting an unusually hot form of GS. The study proposes a hypothesis for the photoactivation mechanism of OCP, emphasizing the high level of vibrational excitation in longitudinal stretching modes as a driving force. In conclusion, the comparison of vibrational signatures reveals unique dynamics of energy dissipation in OCP, providing insights into the photoactivation mechanism and highlighting the impact of the protein environment on carotenoid behavior. The study underscores the importance of vibrational analysis in understanding the intricate processes involved in early phase OCP photoactivation.
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Affiliation(s)
- Petra Chrupková
- The Extreme Light Infrastructure ERIC, ELI Beamlines Facility, Za Radnicí 835, Dolní Břežany, Czech Republic; University of South Bohemia in České Budějovice, Faculty of Science, Branišovská 1760, 370 05 České Budějovice, Czech Republic
| | - Ivo H M van Stokkum
- Vrije Universiteit, Department of Physics and Astronomy, Faculty of Sciences, De Boelelaan 1081, 1081HV Amsterdam, the Netherlands
| | - Thomas Friedrich
- Technische Universität Berlin, Institute of Chemistry PC 14, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Marcus Moldenhauer
- Technische Universität Berlin, Institute of Chemistry PC 14, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Nediljko Budisa
- University of Manitoba, Department of Chemistry, 144 Dysart Rd, 360 Parker Building, Winnipeg, MB R3T 2N2, Canada
| | - Hsueh-Wei Tseng
- University of Manitoba, Department of Chemistry, 144 Dysart Rd, 360 Parker Building, Winnipeg, MB R3T 2N2, Canada
| | - Tomáš Polívka
- University of South Bohemia in České Budějovice, Faculty of Science, Branišovská 1760, 370 05 České Budějovice, Czech Republic
| | - Dmitry A Cherepanov
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 142432 Moscow, Russian Federation; Lomonosov Moscow State University, A.N. Belozersky Institute of Physical-Chemical Biology, 119991 Moscow, Russian Federation
| | - Eugene G Maksimov
- Lomonosov Moscow State University, Faculty of Biology, Vorobyovy Gory 1-12, Moscow 119991, Russian Federation
| | - Miroslav Kloz
- The Extreme Light Infrastructure ERIC, ELI Beamlines Facility, Za Radnicí 835, Dolní Břežany, Czech Republic.
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2
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Götze JP. Vibrational Relaxation in Carotenoids as an Explanation for Their Rapid Optical Properties. J Phys Chem B 2019; 123:2203-2209. [PMID: 30779570 DOI: 10.1021/acs.jpcb.8b09841] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We propose the ultrafast S2 (1Bu) to S1 (2Ag) "electronic internal conversion" observed in carotenoids to be a vibrational relaxation of the 1Bu state. This suggestion arises from comparing excited-state geometries computed with the CAM-B3LYP density functional to the ground states; it is found that each conjugated atom moves less than 5 pm in, for example, violaxanthin. However, the changes of excitation energies are large, ranging from 0.4 to 1.2 eV. This is connected to the size of the conjugated system: while each atom contributes only 0.02-0.06 eV, the sum amounts to the observed shift. Additional analysis of computational data is provided from new or already published calculations. As the mechanism may be valid for all linear polyenes, the model has implications that go beyond the presented case of carotenoids. Finally, four sets of experimental data on carotenoids published elsewhere are reinterpreted. The model predicts near-infrared (IR) absorptions and transient femtosecond IR spectra within 0.1 eV accuracy.
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Affiliation(s)
- Jan P Götze
- Institut für Chemie und Biochemie, Physikalische und Theoretische Chemie , Freie Universität Berlin , Takustr. 3 14195 Berlin , Germany
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3
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Khosravi SD, Bishop MM, LaFountain AM, Turner DB, Gibson GN, Frank HA, Berrah N. Addition of a Carbonyl End Group Increases the Rate of Excited-State Decay in a Carotenoid via Conjugation Extension and Symmetry Breaking. J Phys Chem B 2018; 122:10872-10879. [PMID: 30387609 DOI: 10.1021/acs.jpcb.8b06732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Steady-state absorption, transient absorption, and transient grating spectroscopies were employed to elucidate the role of a conjugated carbonyl group in the photophysics of carotenoids. Spheroidenone and spheroidene have similar molecular structures and differ only in an additional carbonyl group in spheroidenone. Comparison of the optical responses of these two molecules under similar experimental conditions was used to understand the role of this carbonyl group in the structure. It was found that the carbonyl group has two main effects: first, it dramatically increases the depopulation rate of the excited states of the molecule. The lifetimes of all the excited states of spheroidenone were found to be almost half of the ones for spheroidene. Second, the presence of the carbonyl group in the chain alters the decay mechanism to the symmetry-forbidden S1 state of the molecule, so that the higher vibrational levels of the S1 state are populated much more effectively. It was also revealed that for both molecules, the S2/S x → S1(hot) → S1 decay process is not purely sequential and follows a branched model.
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Affiliation(s)
| | | | | | - Daniel B Turner
- Department of Chemistry , New York University , New York 10003 , United States
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4
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Roscioli JD, Ghosh S, LaFountain AM, Frank HA, Beck WF. Structural Tuning of Quantum Decoherence and Coherent Energy Transfer in Photosynthetic Light Harvesting. J Phys Chem Lett 2018; 9:5071-5077. [PMID: 30118229 DOI: 10.1021/acs.jpclett.8b01919] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photosynthetic organisms capture energy from solar photons by constructing light-harvesting proteins containing arrays of electronic chromophores. Collective excitations (excitons) arise when energy transfer between chromophores is coherent, or wavelike, in character. Here we demonstrate experimentally that coherent energy transfer to the lowest-energy excitons is principally controlled in a light-harvesting protein by the temporal persistence of quantum coherence rather than by the strength of vibronic coupling. In the peridinin-chlorophyll protein from marine dinoflagellates, broad-band two-dimensional electronic spectroscopy reveals that replacing the native chlorophyll a acceptor chromophores with chlorophyll b slows energy transfer from the carotenoid peridinin to chlorophyll despite narrowing the donor-acceptor energy gap. The formyl substituent on the chlorophyll b macrocycle hastens decoherence by sensing the surrounding electrostatic noise. These findings demonstrate how quantum coherence enhances the efficiency of energy transfer despite being very short lived in light-harvesting proteins at physiological temperatures.
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Affiliation(s)
- Jerome D Roscioli
- Department of Chemistry , Michigan State University , East Lansing , Michigan 48824 , United States
| | - Soumen Ghosh
- Department of Chemistry , Michigan State University , East Lansing , Michigan 48824 , United States
| | - Amy M LaFountain
- Department of Chemistry , University of Connecticut , Hartford , Connecticut 06103 , United States
| | - Harry A Frank
- Department of Chemistry , University of Connecticut , Hartford , Connecticut 06103 , United States
| | - Warren F Beck
- Department of Chemistry , Michigan State University , East Lansing , Michigan 48824 , United States
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5
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Niedzwiedzki DM, Blankenship RE. Excited-state properties of the central-cis isomer of the carotenoid peridinin. Arch Biochem Biophys 2018; 649:29-36. [DOI: 10.1016/j.abb.2018.05.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 04/10/2018] [Accepted: 05/04/2018] [Indexed: 01/09/2023]
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6
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Lerch MM, Medved′ M, Lapini A, Laurent AD, Iagatti A, Bussotti L, Szymański W, Buma WJ, Foggi P, Di Donato M, Feringa BL. Tailoring Photoisomerization Pathways in Donor–Acceptor Stenhouse Adducts: The Role of the Hydroxy Group. J Phys Chem A 2018; 122:955-964. [DOI: 10.1021/acs.jpca.7b10255] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael M. Lerch
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
| | - Miroslav Medved′
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 1192/12, CZ-771 46 Olomouc, Czech Republic
- Department
of Chemistry, Faculty of Natural Sciences, Matej Bel University, Tajovského 40, SK-97400 Banská Bystrica, Slovak Republic
| | - Andrea Lapini
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- Dipartimento
di Chimica “Ugo Schiff”, Università di Firenze, via della
Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Adèle D. Laurent
- CEISAM, UMR CNRS 6230, BP 92208, 2 Rue de la Houssinière, 44322 Nantes, Cedex 3, France
| | - Alessandro Iagatti
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
| | - Wiktor Szymański
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
- Department
of Radiology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Wybren Jan Buma
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, Science
Park 904, 1098 XH Amsterdam, The Netherlands
| | - Paolo Foggi
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
- Dipartimento
di Chimica, Università di Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
| | - Mariangela Di Donato
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
| | - Ben L. Feringa
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
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7
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Kraack JP. Ultrafast structural molecular dynamics investigated with 2D infrared spectroscopy methods. Top Curr Chem (Cham) 2017; 375:86. [PMID: 29071445 DOI: 10.1007/s41061-017-0172-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 10/02/2017] [Indexed: 12/23/2022]
Abstract
Ultrafast, multi-dimensional infrared (IR) spectroscopy has been advanced in recent years to a versatile analytical tool with a broad range of applications to elucidate molecular structure on ultrafast timescales, and it can be used for samples in a many different environments. Following a short and general introduction on the benefits of 2D IR spectroscopy, the first part of this chapter contains a brief discussion on basic descriptions and conceptual considerations of 2D IR spectroscopy. Outstanding classical applications of 2D IR are used afterwards to highlight the strengths and basic applicability of the method. This includes the identification of vibrational coupling in molecules, characterization of spectral diffusion dynamics, chemical exchange of chemical bond formation and breaking, as well as dynamics of intra- and intermolecular energy transfer for molecules in bulk solution and thin films. In the second part, several important, recently developed variants and new applications of 2D IR spectroscopy are introduced. These methods focus on (i) applications to molecules under two- and three-dimensional confinement, (ii) the combination of 2D IR with electrochemistry, (iii) ultrafast 2D IR in conjunction with diffraction-limited microscopy, (iv) several variants of non-equilibrium 2D IR spectroscopy such as transient 2D IR and 3D IR, and (v) extensions of the pump and probe spectral regions for multi-dimensional vibrational spectroscopy towards mixed vibrational-electronic spectroscopies. In light of these examples, the important open scientific and conceptual questions with regard to intra- and intermolecular dynamics are highlighted. Such questions can be tackled with the existing arsenal of experimental variants of 2D IR spectroscopy to promote the understanding of fundamentally new aspects in chemistry, biology and materials science. The final part of the chapter introduces several concepts of currently performed technical developments, which aim at exploiting 2D IR spectroscopy as an analytical tool. Such developments embrace the combination of 2D IR spectroscopy and plasmonic spectroscopy for ultrasensitive analytics, merging 2D IR spectroscopy with ultra-high-resolution microscopy (nanoscopy), future variants of transient 2D IR methods, or 2D IR in conjunction with microfluidics. It is expected that these techniques will allow for groundbreaking research in many new areas of natural sciences.
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Affiliation(s)
- Jan Philip Kraack
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.
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8
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Ghosh S, Bishop MM, Roscioli JD, LaFountain AM, Frank HA, Beck WF. Excitation Energy Transfer by Coherent and Incoherent Mechanisms in the Peridinin-Chlorophyll a Protein. J Phys Chem Lett 2017; 8:463-469. [PMID: 28042923 DOI: 10.1021/acs.jpclett.6b02881] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Excitation energy transfer from peridinin to chlorophyll (Chl) a is unusually efficient in the peridinin-chlorophyll a protein (PCP) from dinoflagellates. This enhanced performance is derived from the long intrinsic lifetime of 4.4 ps for the S2 (11Bu+) state of peridinin in PCP, which arises from the electron-withdrawing properties of its carbonyl substituent. Results from heterodyne transient grating spectroscopy indicate that S2 serves as the donor for two channels of energy transfer: a 30 fs process involving quantum coherence and delocalized peridinin-Chl states and an incoherent, 2.5 ps process initiated by dynamic exciton localization, which accompanies the formation of a conformationally distorted intermediate in 45 fs. The lifetime of the S2 state is lengthened in PCP by its intramolecular charge-transfer character, which increases the system-bath coupling and slows the torsional motions that promote nonradiative decay to the S1 (21Ag-) state.
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Affiliation(s)
- Soumen Ghosh
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
| | - Michael M Bishop
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
| | - Jerome D Roscioli
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
| | - Amy M LaFountain
- Department of Chemistry, University of Connecticut , Storrs, Connecticut 06269-3036, United States
| | - Harry A Frank
- Department of Chemistry, University of Connecticut , Storrs, Connecticut 06269-3036, United States
| | - Warren F Beck
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
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9
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Ghosh S, Roscioli JD, Bishop MM, Gurchiek JK, LaFountain AM, Frank HA, Beck WF. Torsional Dynamics and Intramolecular Charge Transfer in the S2 (1(1)Bu(+)) Excited State of Peridinin: A Mechanism for Enhanced Mid-Visible Light Harvesting. J Phys Chem Lett 2016; 7:3621-3626. [PMID: 27571487 DOI: 10.1021/acs.jpclett.6b01642] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Of the carotenoids known in photosynthetic organisms, peridinin exhibits one of the highest quantum efficiencies for excitation energy transfer to chlorophyll (Chl) a acceptors. The mechanism for this enhanced performance involves an order-of-magnitude slowing of the S2 (1(1)Bu(+)) → S1 (2(1)Ag(-)) nonradiative decay pathway compared to carotenoids lacking carbonyl substitution. Using femtosecond transient grating spectroscopy with optical heterodyne detection, we have obtained the first evidence that the nonradiative decay of the S2 state of peridinin is promoted by large-amplitude torsional motions. The decay of an intermediate state termed Sx, which we assign to a twisted form of the S2 state, is substantially slowed by solvent friction in peridinin due to its intramolecular charge transfer (ICT) character.
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Affiliation(s)
- Soumen Ghosh
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
| | - Jerome D Roscioli
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
| | - Michael M Bishop
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
| | - Jason K Gurchiek
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
| | - Amy M LaFountain
- Department of Chemistry, University of Connecticut , Storrs, Connecticut 06269-3036, United States
| | - Harry A Frank
- Department of Chemistry, University of Connecticut , Storrs, Connecticut 06269-3036, United States
| | - Warren F Beck
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824-1322, United States
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10
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Redeckas K, Voiciuk V, Vengris M. Investigation of the S1/ICT equilibrium in fucoxanthin by ultrafast pump-dump-probe and femtosecond stimulated Raman scattering spectroscopy. PHOTOSYNTHESIS RESEARCH 2016; 128:169-181. [PMID: 26742754 DOI: 10.1007/s11120-015-0215-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2015] [Accepted: 12/29/2015] [Indexed: 06/05/2023]
Abstract
Time-resolved multi-pulse spectroscopic methods-pump-dump-probe (PDP) and femtosecond stimulated Raman spectroscopy-were used to investigate the excited state photodynamics of the carbonyl group containing carotenoid fucoxanthin (FX). PDP experiments show that S1 and ICT states in FX are strongly coupled and that the interstate equilibrium is rapidly (<5 ps) reestablished after one of the interacting states is deliberately depopulated. Femtosecond stimulated Raman scattering experiments indicate that S1 and ICT are vibrationally distinct species. Identification of the FSRS modes on the S1 and ICT potential energy surfaces allows us to predict a possible coupling channel for the state interaction.
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Affiliation(s)
- Kipras Redeckas
- Department of Quantum Electronics, Faculty of Physics, Vilnius University, Saulėtekio AV. 10, 10223, Vilnius, Lithuania.
| | - Vladislava Voiciuk
- Department of Quantum Electronics, Faculty of Physics, Vilnius University, Saulėtekio AV. 10, 10223, Vilnius, Lithuania
| | - Mikas Vengris
- Department of Quantum Electronics, Faculty of Physics, Vilnius University, Saulėtekio AV. 10, 10223, Vilnius, Lithuania
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11
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Dietze DR, Mathies RA. Femtosecond Stimulated Raman Spectroscopy. Chemphyschem 2016; 17:1224-51. [DOI: 10.1002/cphc.201600104] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Daniel R. Dietze
- Department of Chemistry; University of California in Berkeley; CA Berkeley 94720 USA
| | - Richard A. Mathies
- Department of Chemistry; University of California in Berkeley; CA Berkeley 94720 USA
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12
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Keşan G, Durchan M, Tichý J, Minofar B, Kuznetsova V, Fuciman M, Šlouf V, Parlak C, Polívka T. Different Response of Carbonyl Carotenoids to Solvent Proticity Helps To Estimate Structure of the Unknown Carotenoid from Chromera velia. J Phys Chem B 2015; 119:12653-63. [PMID: 26362118 DOI: 10.1021/acs.jpcb.5b08152] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In order to estimate the possible structure of the unknown carbonyl carotenoid related to isofucoxanthin from Chromera velia denoted as isofucoxanthin-like carotenoid (Ifx-l), we employed steady-state and ultrafast time-resolved spectroscopic techniques to investigate spectroscopic properties of Ifx-l in various solvents. The results were compared with those measured for related carotenoids with known structure: fucoxanthin (Fx) and isofucoxanthin (Ifx). The experimental data were complemented by quantum chemistry calculations and molecular modeling. The data show that Ifx-l must have longer effective conjugation length than Ifx. Yet, the magnitude of polarity-dependent changes in Ifx-l is larger than for Ifx, suggesting significant differences in structure of these two carotenoids. The most interesting spectroscopic feature of Ifx-l is its response to solvent proticity. The transient absorption data show that (1) the magnitude of the ICT-like band of Ifx-l in acetonitrile is larger than in methanol and (2) the S1/ICT lifetime of Ifx-l in acetonitrile, 4 ps, is markedly shorter than in methanol (10 ps). This is opposite behavior than for Fx and Ifx whose S1/ICT lifetimes are always shorter in protic solvent methanol (20 and 13 ps) than in aprotic acetonitrile (30 and 17 ps). Comparison with other carbonyl carotenoids reported earlier showed that proticity response of Ifx-l is consistent with presence of a conjugated lactone ring. Combining the experimental data and quantum chemistry calculations, we estimated a possible structure of Ifx-l.
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Affiliation(s)
- Gürkan Keşan
- Institute of Physics and Biophysics, Faculty of Science, University of South Bohemia , Branišovská 1760, 37005 České Budějovice, Czech Republic
| | - Milan Durchan
- Institute of Physics and Biophysics, Faculty of Science, University of South Bohemia , Branišovská 1760, 37005 České Budějovice, Czech Republic.,Institute of Plant Molecular Biology, Biological Centre, Czech Academy of Sciences , České Budějovice, Czech Republic
| | - Josef Tichý
- Institute of Physics and Biophysics, Faculty of Science, University of South Bohemia , Branišovská 1760, 37005 České Budějovice, Czech Republic.,Institute of Plant Molecular Biology, Biological Centre, Czech Academy of Sciences , České Budějovice, Czech Republic
| | - Babak Minofar
- Institute of Physics and Biophysics, Faculty of Science, University of South Bohemia , Branišovská 1760, 37005 České Budějovice, Czech Republic.,Center for Nanobiology and Structural Biology, Institute of Microbiology and Global Change Research Center, Academy of Sciences of the Czech Republic , Nové Hrady, Czech Republic
| | - Valentyna Kuznetsova
- Institute of Physics and Biophysics, Faculty of Science, University of South Bohemia , Branišovská 1760, 37005 České Budějovice, Czech Republic
| | - Marcel Fuciman
- Institute of Physics and Biophysics, Faculty of Science, University of South Bohemia , Branišovská 1760, 37005 České Budějovice, Czech Republic
| | - Václav Šlouf
- Institute of Physics and Biophysics, Faculty of Science, University of South Bohemia , Branišovská 1760, 37005 České Budějovice, Czech Republic
| | - Cemal Parlak
- Department of Physics, Dumlupınar University , Kütahya, Turkey
| | - Tomáš Polívka
- Institute of Physics and Biophysics, Faculty of Science, University of South Bohemia , Branišovská 1760, 37005 České Budějovice, Czech Republic.,Institute of Plant Molecular Biology, Biological Centre, Czech Academy of Sciences , České Budějovice, Czech Republic
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13
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Götze JP, Karasulu B, Patil M, Thiel W. Vibrational relaxation as the driving force for wavelength conversion in the peridinin-chlorophyll a-protein. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2015; 1847:1509-17. [PMID: 26231454 DOI: 10.1016/j.bbabio.2015.07.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 07/21/2015] [Accepted: 07/25/2015] [Indexed: 11/29/2022]
Abstract
We present a computationally derived energy transfer model for the peridinin-chlorophyll a-protein (PCP), which invokes vibrational relaxation in the two lowest singlet excited states rather than internal conversion between them. The model allows an understanding of the photoinduced processes without assuming further electronic states or a dependence of the 2Ag state character on the vibrational sub-state. We report molecular dynamics simulations (CHARMM22 force field) and quantum mechanics/molecular mechanics (QM/MM) calculations on PCP. In the latter, the QM region containing a single peridinin (Per) chromophore or a Per-Chl a (chlorophyll a) pair is treated by density functional theory (DFT, CAM-B3LYP) for geometries and by DFT-based multireference configuration interaction (DFT/MRCI) for excitation energies. The calculations show that Per has a bright, green light absorbing 2Ag state, in addition to the blue light absorbing 1Bu state found in other carotenoids. Both states undergo a strong energy lowering upon relaxation, leading to emission in the red, while absorbing in the blue or green. The orientation of their transition dipole moments indicates that both states are capable of excited-state energy transfer to Chl a, without preference for either 1Bu or 2Ag as donor state. We propose that the commonly postulated partial intramolecular charge transfer (ICT) character of a donating Per state can be assigned to the relaxed 1Bu state, which takes on ICT character. By assuming that both 1Bu and 2Ag are able to donate to the Chl a Q band, one can explain why different chlorophyll species in PCP exhibit different acceptor capabilities.
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Affiliation(s)
- Jan P Götze
- School of Chemistry, North Haugh, University of St Andrews, St Andrews, Fife KY16 9ST, UK.
| | - Bora Karasulu
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Mahendra Patil
- Center for Excellence in Basic Sciences, University of Mumbai, Mumbai 400098, Maharashtra, India
| | - Walter Thiel
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
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Light-Induced Infrared Difference Spectroscopy in the Investigation of Light Harvesting Complexes. Molecules 2015; 20:12229-49. [PMID: 26151118 PMCID: PMC6332223 DOI: 10.3390/molecules200712229] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 06/16/2015] [Accepted: 06/17/2015] [Indexed: 01/24/2023] Open
Abstract
Light-induced infrared difference spectroscopy (IR-DS) has been used, especially in the last decade, to investigate early photophysics, energy transfer and photoprotection mechanisms in isolated and membrane-bound light harvesting complexes (LHCs). The technique has the definite advantage to give information on how the pigments and the other constituents of the biological system (proteins, membranes, etc.) evolve during a given photoreaction. Different static and time-resolved approaches have been used. Compared to the application of IR-DS to photosynthetic Reaction Centers (RCs), however, IR-DS applied to LHCs is still in an almost pioneering age: very often sophisticated techniques (step-scan FTIR, ultrafast IR) or data analysis strategies (global analysis, target analysis, multivariate curve resolution) are needed. In addition, band assignment is usually more complicated than in RCs. The results obtained on the studied systems (chromatophores and RC-LHC supercomplexes from purple bacteria; Peridinin-Chlorophyll-a-Proteins from dinoflagellates; isolated LHCII from plants; thylakoids; Orange Carotenoid Protein from cyanobacteria) are summarized. A description of the different IR-DS techniques used is also provided, and the most stimulating perspectives are also described. Especially if used synergically with other biophysical techniques, light-induced IR-DS represents an important tool in the investigation of photophysical/photochemical reactions in LHCs and LHC-containing systems.
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Di Donato M, Ragnoni E, Lapini A, Kardaś TM, Ratajska-Gadomska B, Foggi P, Righini R. Identification of the Excited-State C═C and C═O Modes of trans-β-Apo-8'-carotenal with Transient 2D-IR-EXSY and Femtosecond Stimulated Raman Spectroscopy. J Phys Chem Lett 2015; 6:1592-1598. [PMID: 26263319 DOI: 10.1021/acs.jpclett.5b00528] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Assigning the vibrational modes of molecules in the electronic excited state is often a difficult task. Here we show that combining two nonlinear spectroscopic techniques, transient 2D exchange infrared spectroscopy (T2D-IR-EXSY) and femtosecond stimulated Raman spectroscopy (FSRS), the contribution of the C═C and C═O modes in the excited-state vibrational spectra of trans-β-apo-8'-carotenal can be unambiguously identified. The experimental results reported in this work confirm a previously proposed assignment based on quantum-chemical calculations and further strengthen the role of an excited state with charge-transfer character in the relaxation pathway of carbonyl carotenoids. On a more general ground, our results highlight the potentiality of nonlinear spectroscopic methods based on the combined use of visible and infrared pulses to correlate structural and electronic changes in photoexcited molecules.
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Affiliation(s)
- Mariangela Di Donato
- †LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- ‡INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
- §Dipartimento di Chimica "Ugo Schiff", Università di Firenze, via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Elena Ragnoni
- †LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- ‡INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
| | - Andrea Lapini
- †LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- ‡INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
- §Dipartimento di Chimica "Ugo Schiff", Università di Firenze, via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Tomasz M Kardaś
- ∥Department of Chemistry, University of Warsaw, Zwirki Wigury 101, 02-089 Warsaw, Poland
| | | | - Paolo Foggi
- †LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- ‡INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
- ⊥Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
| | - Roberto Righini
- †LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- ‡INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
- §Dipartimento di Chimica "Ugo Schiff", Università di Firenze, via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
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