1
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Ashworth E, Coughlan NJA, Hopkins WS, Bieske EJ, Bull JN. Excited-State Barrier Controls E → Z Photoisomerization in p-Hydroxycinnamate Biochromophores. J Phys Chem Lett 2022; 13:9028-9034. [PMID: 36149746 PMCID: PMC9549896 DOI: 10.1021/acs.jpclett.2c02613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
Molecules based on the deprotonated p-hydroxycinnamate moiety are widespread in nature, including serving as UV filters in the leaves of plants and as the biochromophore in photoactive yellow protein. The photophysical behavior of these chromophores is centered around a rapid E → Z photoisomerization by passage through a conical intersection seam. Here, we use photoisomerization and photodissociation action spectroscopies with deprotonated 4-hydroxybenzal acetone (pCK-) to characterize a wavelength-dependent bifurcation between electron autodetachment (spontaneous ejection of an electron from the S1 state because it is situated in the detachment continuum) and E → Z photoisomerization. While autodetachment occurs across the entire S1(ππ*) band (370-480 nm), E → Z photoisomerization occurs only over a blue portion of the band (370-430 nm). No E → Z photoisomerization is observed when the ketone functional group in pCK- is replaced with an ester or carboxylic acid. The wavelength-dependent bifurcation is consistent with potential energy surface calculations showing that a barrier separates the Franck-Condon region from the E → Z isomerizing conical intersection. The barrier height, which is substantially higher in the gas phase than in solution, depends on the functional group and governs whether E → Z photoisomerization occurs more rapidly than autodetachment.
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Affiliation(s)
- Eleanor
K. Ashworth
- School
of Chemistry, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - Neville J. A. Coughlan
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- WaterMine
Innovation, Inc., Waterloo, Ontario N0B 2T0, Canada
| | - W. Scott Hopkins
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- WaterMine
Innovation, Inc., Waterloo, Ontario N0B 2T0, Canada
| | - Evan J. Bieske
- School
of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - James N. Bull
- School
of Chemistry, University of East Anglia, Norwich NR4 7TJ, United Kingdom
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2
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Joram Mendoza D, Mouterde LMM, Browne C, Singh Raghuwanshi V, Simon GP, Garnier G, Allais F. Grafting Nature-Inspired and Bio-Based Phenolic Esters onto Cellulose Nanocrystals Gives Biomaterials with Photostable Anti-UV Properties. CHEMSUSCHEM 2020; 13:6552-6561. [PMID: 32956544 DOI: 10.1002/cssc.202002017] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/18/2020] [Indexed: 06/11/2023]
Abstract
New nature-inspired and plant-derived p-hydroxycinnamate esters and p-hydroxycinnamate diesters provide excellent protection against UV radiation when incorporated into a matrix. Herein, an efficient and sustainable pathway is reported to graft these phenolic compounds onto cellulose nanocrystals (CNCs) via click-type copper-catalyzed azide/alkyne cycloaddition (CuAAC) reaction. The successful grafting of the phenolic esters on CNC surface was evidenced by a range of chemical analyses, and the degrees of substitution (DS) of the CNC were found to depend on the structure of the phenolic ester grafted. Moreover, aqueous suspensions of the phenolic ester-grafted CNCs not only strongly absorb in both the UVA and UVB regions, but they also exhibit average to very high photostability. Their wide spectrum UV-absorbing properties and their stability upon exposure to UV are highly influenced by the structure of the phenolic ester, particularly by the extra ester group in p-hydroxycinnamate diesters. These findings demonstrate that cellulose nanocrystals decorated with such plant-derived and nature-inspired phenolic esters are promising sustainable nanomaterials for anti-UV applications.
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Affiliation(s)
- David Joram Mendoza
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Louis M M Mouterde
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, 51110, Pomacle, France
| | - Christine Browne
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Vikram Singh Raghuwanshi
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - George P Simon
- Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Gil Garnier
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, 51110, Pomacle, France
| | - Florent Allais
- Bioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, 51110, Pomacle, France
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3
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Wang D, Li X, Wang L, Yang X, Zhong D. Elucidating Ultrafast Multiphasic Dynamics in the Photoisomerization of Cyanobacteriochrome. J Phys Chem Lett 2020; 11:8819-8824. [PMID: 32940473 PMCID: PMC8172094 DOI: 10.1021/acs.jpclett.0c02467] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Understanding photoisomerization dynamics in cyanobacteriochromes is important to the development of optical agents in near-infrared biological imaging and optogenetics. Here, by integrating femtosecond spectroscopy and site-directed mutagenesis, we investigate the photoinduced Pr-state isomerization dynamics and mechanism of a unique red/green cyanobacteriochrome from Leptolyngbya sp. JSC-1. We observed multiphasic dynamics in the Pr state, a widespread phenomenon for photoreceptors in the phytochrome superfamily, and revealed their origins; the initial dynamics over a few to tens and hundreds of picoseconds arises from the local active-site relaxations followed by the slow double-bond isomerization in several hundreds of picoseconds. Such continuous active-site evolution results in a unique spectral tuning effect that favors the blue-side emission and suppresses the red-side emission. We also observed the faster dynamics in both relaxation and isomerization with critical mutants at the active site that render a looser active site. These results clearly distinguish the multiphasic dynamics between relaxation and isomerization and reveal a novel molecular mechanism for better biological applications.
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Affiliation(s)
| | | | | | - Xiaojing Yang
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
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4
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Revealing the origin of multiphasic dynamic behaviors in cyanobacteriochrome. Proc Natl Acad Sci U S A 2020; 117:19731-19736. [PMID: 32759207 DOI: 10.1073/pnas.2001114117] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Cyanobacteriochromes are photoreceptors in cyanobacteria that exhibit a wide spectral coverage and unique photophysical properties from the photoinduced isomerization of a linear tetrapyrrole chromophore. Here, we integrate femtosecond-resolved fluorescence and transient-absorption methods and unambiguously showed the significant solvation dynamics occurring at the active site from a few to hundreds of picoseconds. These motions of local water molecules and polar side chains are continuously convoluted with the isomerization reaction, leading to a nonequilibrium processes with continuous active-site motions. By mutations of critical residues at the active site, the modified local structures become looser, resulting in faster solvation relaxations and isomerization reaction. The observation of solvation dynamics is significant and critical to the correct interpretation of often-observed multiphasic dynamic behaviors, and thus the previously invoked ground-state heterogeneity may not be relevant to the excited-state isomerization reaction.
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5
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Bull JN, Anstöter CS, Verlet JRR. Fingerprinting the Excited-State Dynamics in Methyl Ester and Methyl Ether Anions of Deprotonated para-Coumaric Acid. J Phys Chem A 2020; 124:2140-2151. [PMID: 32105474 DOI: 10.1021/acs.jpca.9b11993] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Chromophores based on the para-hydroxycinnamate moiety are widespread in the natural world, including as the photoswitching unit in photoactive yellow protein and as a sunscreen in the leaves of plants. Here, photodetachment action spectroscopy combined with frequency- and angle-resolved photoelectron imaging is used to fingerprint the excited-state dynamics over the first three bright action-absorption bands in the methyl ester anions (pCEs-) of deprotonated para-coumaric acid at a temperature of ∼300 K. The excited states associated with the action-absorption bands are classified as resonances because they are situated in the detachment continuum and are open to autodetachment. The frequency-resolved photoelectron spectrum for pCEs- indicates that all photon energies over the S1(ππ*) band lead to similar vibrational autodetachment dynamics. The S2(nπ*) band is Herzberg-Teller active and has comparable brightness to the higher lying 21(ππ*) band. The frequency-resolved photoelectron spectrum over the S2(nπ*) band indicates more efficient internal conversion to the S1(ππ*) state for photon energies resonant with the Franck-Condon modes (∼80%) compared with the Herzberg-Teller modes (∼60%). The third action-absorption band, which corresponds to excitation of the 21(ππ*) state, shows complex and photon energy-dependent dynamics, with 20-40% of photoexcited population internally converting to the S1(ππ*) state. There is also evidence for a mode-specific competition between prompt autodetachment and internal conversion on the red edge of the 21(ππ*) band. There is no evidence for recovery of the ground electronic state and statistical electron ejection (thermionic emission) following photoexcitation over any of the three action-absorption bands. The photoelectron spectra for the deprotonated methyl ether derivative (pCEt-) at photon energies over the S1(ππ*) and S2(nπ*) bands indicate diametrically opposed dynamics compared with pCEs-, namely, intense thermionic emission due to efficient recovery of the ground electronic state.
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Affiliation(s)
- James N Bull
- School of Chemistry, Norwich Research Park, University of East Anglia, Norwich NR4 7TJ, U.K
| | - Cate S Anstöter
- Department of Chemistry, Durham University, Durham DH1 3LE, U.K
| | - Jan R R Verlet
- Department of Chemistry, Durham University, Durham DH1 3LE, U.K
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6
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Bull JN, Anstöter CS, Verlet JRR. Ultrafast valence to non-valence excited state dynamics in a common anionic chromophore. Nat Commun 2019; 10:5820. [PMID: 31862884 PMCID: PMC6925192 DOI: 10.1038/s41467-019-13819-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 11/27/2019] [Indexed: 12/19/2022] Open
Abstract
Non-valence states in neutral molecules (Rydberg states) have well-established roles and importance in photochemistry, however, considerably less is known about the role of non-valence states in photo-induced processes in anions. Here, femtosecond time-resolved photoelectron imaging is used to show that photoexcitation of the S1(ππ*) state of the methyl ester of deprotonated para-coumaric acid – a model chromophore for photoactive yellow protein (PYP) – leads to a bifurcation of the excited state wavepacket. One part remains on the S1(ππ*) state forming a twisted intermediate, whilst a second part leads to the formation of a non-valence (dipole-bound) state. Both populations eventually decay independently by vibrational autodetachment. Valence-to-non-valence internal conversion has hitherto not been observed in the intramolecular photophysics of an isolated anion, raising questions into how common such processes might be, given that many anionic chromophores have bright valence states near the detachment threshold. Photoactive biomolecules rely on chromophores whose photochemistry depends on the environment. Here, the excited state dynamics of a model for the anionic biochromophore in photoactive yellow protein is investigated by time-resolved photoelectron spectroscopy showing involvement of a non-valence state, and lack of E-Z isomerisation in the gas phase.
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Affiliation(s)
- James N Bull
- School of Chemistry, Norwich Research Park, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Cate S Anstöter
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK
| | - Jan R R Verlet
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
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7
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Bull JN, Silva GD, Scholz MS, Carrascosa E, Bieske EJ. Photoinitiated Intramolecular Proton Transfer in Deprotonated para-Coumaric Acid. J Phys Chem A 2019; 123:4419-4430. [DOI: 10.1021/acs.jpca.9b02023] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James N. Bull
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
- School of Chemistry, Norwich Research Park, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - Gabriel da Silva
- Department of Chemical Engineering, University of Melbourne, Parkville, VIC 3010, Australia
| | - Michael S. Scholz
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Eduardo Carrascosa
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Evan J. Bieske
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
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8
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Keša P, Jancura D, Kudláčová J, Valušová E, Antalík M. Excitation of triplet states of hypericin in water mediated by hydrotropic cromolyn sodium salt. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 193:185-191. [PMID: 29241053 DOI: 10.1016/j.saa.2017.12.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 11/10/2017] [Accepted: 12/01/2017] [Indexed: 06/07/2023]
Abstract
Hypericin (Hyp) is a hydrophobic pigment found in plants of the genus Hypericum which exhibits low levels of solubility in water. This work shows that the solubility of Hyp can be significantly increased through the addition of cromolyn disodium salt (DSCG). Performed studies using UV-VIS absorption and fluorescence spectroscopies demonstrate that Hyp remains in a predominantly biologically photodynamic active monomeric form in the presence of DSCG at concentrations ranging from 4.6×10-3 to 1.2×10-1mol·L-1. The low association constant between Hyp and DSCG (Ka=71.7±2M-1), and the polarity value of 0.3 determined for Hyp in a DSCG-water solution, lead to a suggestion that the monomerization of Hyp in aqueous solution can be explained as a result of the hydrotropic effect of DSCG. This hydrotropic effect is most likely a result of interactions between two relative rigid aromatic rings of DSCG and a delocalized charge on the surface of the Hyp molecule. The triplet-triplet (T-T) electronic transition observed in is Hyp in the presence of DSCG suggests a possible production of reactive oxygen species once Hyp is irradiated with visible light in a DSCG aqueous solution.
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Affiliation(s)
- Peter Keša
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia.
| | - Daniel Jancura
- Department of Biophysics, Faculty of Science, P.J. Šafárik University, Jesenná 5, 041 54 Košice, Slovakia; Center for Interdisciplinary Biosciences, Faculty of Science, P.J. Šafárik University, Jesenná 5, 041 54 Košice, Slovakia
| | - Júlia Kudláčová
- Department of Biochemistry, Faculty of Science, P.J. Šafárik University, Šrobárova 2, 041 80 Košice, Slovakia
| | - Eva Valušová
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
| | - Marián Antalík
- Department of Biochemistry, Faculty of Science, P.J. Šafárik University, Šrobárova 2, 041 80 Košice, Slovakia; Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
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9
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Mix LT, Carroll EC, Morozov D, Pan J, Gordon WR, Philip A, Fuzell J, Kumauchi M, van Stokkum I, Groenhof G, Hoff WD, Larsen DS. Excitation-Wavelength-Dependent Photocycle Initiation Dynamics Resolve Heterogeneity in the Photoactive Yellow Protein from Halorhodospira halophila. Biochemistry 2018; 57:1733-1747. [PMID: 29465990 DOI: 10.1021/acs.biochem.7b01114] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Photoactive yellow proteins (PYPs) make up a diverse class of blue-light-absorbing bacterial photoreceptors. Electronic excitation of the p-coumaric acid chromophore covalently bound within PYP results in triphasic quenching kinetics; however, the molecular basis of this behavior remains unresolved. Here we explore this question by examining the excitation-wavelength dependence of the photodynamics of the PYP from Halorhodospira halophila via a combined experimental and computational approach. The fluorescence quantum yield, steady-state fluorescence emission maximum, and cryotrapping spectra are demonstrated to depend on excitation wavelength. We also compare the femtosecond photodynamics in PYP at two excitation wavelengths (435 and 475 nm) with a dual-excitation-wavelength-interleaved pump-probe technique. Multicompartment global analysis of these data demonstrates that the excited-state photochemistry of PYP depends subtly, but convincingly, on excitation wavelength with similar kinetics with distinctly different spectral features, including a shifted ground-state beach and altered stimulated emission oscillator strengths and peak positions. Three models involving multiple excited states, vibrationally enhanced barrier crossing, and inhomogeneity are proposed to interpret the observed excitation-wavelength dependence of the data. Conformational heterogeneity was identified as the most probable model, which was supported with molecular mechanics simulations that identified two levels of inhomogeneity involving the orientation of the R52 residue and different hydrogen bonding networks with the p-coumaric acid chromophore. Quantum calculations were used to confirm that these inhomogeneities track to altered spectral properties consistent with the experimental results.
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Affiliation(s)
- L Tyler Mix
- Department of Chemistry , University of California, Davis , One Shields Avenue , Davis , California 95616 , United States
| | - Elizabeth C Carroll
- Department of Chemistry , University of California, Davis , One Shields Avenue , Davis , California 95616 , United States
| | - Dmitry Morozov
- Department of Chemistry and NanoScience Center , University of Jyväskylä , P.O. Box 35, 40014 Jyväskylä , Finland
| | - Jie Pan
- Department of Chemistry , University of California, Davis , One Shields Avenue , Davis , California 95616 , United States
| | | | | | - Jack Fuzell
- Department of Chemistry , University of California, Davis , One Shields Avenue , Davis , California 95616 , United States
| | - Masato Kumauchi
- Department of Microbiology and Molecular Genetics , Oklahoma State University , Stillwater , Oklahoma 74078 , United States
| | - Ivo van Stokkum
- Faculty of Sciences , Vrije Universiteit Amsterdam , De Boelelaan 1081 , 1081 HV Amsterdam , The Netherlands
| | - Gerrit Groenhof
- Department of Chemistry and NanoScience Center , University of Jyväskylä , P.O. Box 35, 40014 Jyväskylä , Finland
| | - Wouter D Hoff
- Department of Microbiology and Molecular Genetics , Oklahoma State University , Stillwater , Oklahoma 74078 , United States
| | - Delmar S Larsen
- Department of Chemistry , University of California, Davis , One Shields Avenue , Davis , California 95616 , United States
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10
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Wang S, Schatz S, Stuhldreier MC, Böhnke H, Wiese J, Schröder C, Raeker T, Hartke B, Keppler JK, Schwarz K, Renth F, Temps F. Ultrafast dynamics of UV-excited trans- and cis-ferulic acid in aqueous solutions. Phys Chem Chem Phys 2018; 19:30683-30694. [PMID: 29119980 DOI: 10.1039/c7cp05301k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The ultrafast UV-induced processes of the neutral, anionic and dianionic forms of trans- and cis-ferulic acid (FA) in aqueous solution were studied by static and femtosecond time-resolved emission and absorption spectroscopy combined with quantum chemical calculations. In all cases, initial excitation populates the first 1ππ* state. For the dianionic cis-isomer cFA2-, electronic deactivation takes place with a time constant of only 1.4 ps, whereas in all other cases, excited-state deactivation happens more than ten times slower, on a time scale of ≈20 ps. The data suggest sequential de-excitation pathways, where initial sub-picosecond solvent rearrangement and structural changes are followed by internal conversion to an intermediate excited electronic state from which deactivation to the ground state proceeds. Considering the time scales, barrierless excited-state pathways are suggested only in the case of cFA2-, where the observed formation of the isomerisation photoproduct tFA2- provides clear evidence for a cis ⇄ trans isomerisation coordinate. In the other cases, pathways with an excited-state energy barrier, presumably along the same coordinate, are likely, given the longer excited-state lifetimes.
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Affiliation(s)
- Shuangqing Wang
- Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, Olshausenstr. 40, 24098 Kiel, Germany.
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11
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Henley A, Diveky ME, Patel AM, Parkes MA, Anderson JC, Fielding HH. Electronic structure and dynamics of torsion-locked photoactive yellow protein chromophores. Phys Chem Chem Phys 2017; 19:31572-31580. [PMID: 29165495 DOI: 10.1039/c7cp06950b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photocycle of photoactive yellow protein (PYP) begins with small-scale torsional motions of the chromophore leading to large-scale movements of the protein scaffold triggering a biological response. The role of single-bond torsional molecular motions of the chromophore in the initial steps of the PYP photocycle are not fully understood. Here, we employ anion photoelectron spectroscopy measurements and quantum chemistry calculations to investigate the electronic relaxation dynamics following photoexcitation of four model chromophores, para-coumaric acid, its methyl ester, and two analogues with aliphatic bridges hindering torsional motions around the single bonds adjacent to the alkene group. Following direct photoexcitation of S1 at 400 nm, we find that both single bond rotations play a role in steering the PYP chromophore through the S1/S0 conical intersection but that rotation around the single bond between the alkene moiety and the phenoxide group is particularly important. Following photoexcitation of higher lying electronic states in the range 346-310 nm, we find that rotation around the single bond between the alkene and phenoxide groups also plays a key role in the electronic relaxation from higher lying states to the S1 state. These results have potential applications in tuning the photoresponse of photoactive proteins and materials with chromophores based on PYP.
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Affiliation(s)
- Alice Henley
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
| | - Matus E Diveky
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
| | - Anand M Patel
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
| | - Michael A Parkes
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
| | - James C Anderson
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
| | - Helen H Fielding
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
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12
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Horbury MD, Baker LA, Rodrigues ND, Quan WD, Stavros VG. Photoisomerization of ethyl ferulate: A solution phase transient absorption study. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.02.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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García-Prieto FF, Muñoz-Losa A, Fdez Galván I, Sánchez ML, Aguilar MA, Martín ME. QM/MM Study of Substituent and Solvent Effects on the Excited State Dynamics of the Photoactive Yellow Protein Chromophore. J Chem Theory Comput 2017; 13:737-748. [PMID: 28072537 DOI: 10.1021/acs.jctc.6b01069] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Substituent and solvent effects on the excited state dynamics of the Photoactive Yellow Protein chromophore are studied using the average solvent electrostatic potential from molecular dynamics (ASEP/MD) method. Four molecular models were considered: the ester and thioester derivatives of the p-coumaric acid anion and their methylated derivatives. We found that the solvent produces dramatic modifications on the free energy profile of the S1 state: 1) Two twisted structures that are minima in the gas phase could not be located in aqueous solution. 2) Conical intersections (CIs) associated with the rotation of the single bond adjacent to the phenyl group are found for the four derivatives in water solution but only for thio derivatives in the gas phase. 3) The relative stability of minima and CIs is reverted with respect to the gas phase values, affecting the prevalent de-excitation paths. As a consequence of these changes, three competitive de-excitation channels are open in aqueous solution: the fluorescence emission from a planar minimum on S1, the trans-cis photoisomerization through a CI that involves the rotation of the vinyl double bond, and the nonradiative, nonreactive, de-excitation through the CI associated with the rotation of the single bond adjacent to the phenyl group. In the gas phase, the minima are the structures with the lower energy, while in solution these are the conical intersections. In solution, the de-excitation prevalent path seems to be the photoisomerization for oxo compounds, while thio compounds return to the initial trans ground state without emission.
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Affiliation(s)
- Francisco F García-Prieto
- Área de Química Física, University of Extremadura , Avda. Elvas s/n, Edif. José Ma Viguera Lobo 3a planta, Badajoz, 06006 Spain
| | - Aurora Muñoz-Losa
- Área de Química Física, University of Extremadura , Avda. Elvas s/n, Edif. José Ma Viguera Lobo 3a planta, Badajoz, 06006 Spain
| | - Ignacio Fdez Galván
- Department of Chemistry-Ångström, The Theoretical Chemistry Programme, Uppsala University , Box 518, 751 20 Uppsala, Sweden
| | - M Luz Sánchez
- Área de Química Física, University of Extremadura , Avda. Elvas s/n, Edif. José Ma Viguera Lobo 3a planta, Badajoz, 06006 Spain
| | - Manuel A Aguilar
- Área de Química Física, University of Extremadura , Avda. Elvas s/n, Edif. José Ma Viguera Lobo 3a planta, Badajoz, 06006 Spain
| | - M Elena Martín
- Área de Química Física, University of Extremadura , Avda. Elvas s/n, Edif. José Ma Viguera Lobo 3a planta, Badajoz, 06006 Spain
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14
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Ahamed G, Batuta S, Ghosh D, Begum NA, Mandal D. Photophysical studies on a photoactive yellow protein fluorophore analog with the 4-Hydroxy group replaced by 4-Dimethylamino group. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.11.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Horbury MD, Baker LA, Quan WD, Greenough SE, Stavros VG. Photodynamics of potent antioxidants: ferulic and caffeic acids. Phys Chem Chem Phys 2016; 18:17691-7. [PMID: 27310931 DOI: 10.1039/c6cp01595f] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The dynamics of ferulic acid (3-(4-hydroxy-3-methoxyphenyl)-2-propenoic acid) and caffeic acid (3-(3,4-dihydroxyphenyl)-2-propenoic acid) in acetonitrile, dioxane and water at pH 2.2 following photoexcitation to the first excited singlet state are reported. These hydroxycinnamic acids display both strong ultraviolet absorption and potent antioxidant activity, making them promising sunscreen components. Ferulic and caffeic acids have previously been shown to undergo trans-cis photoisomerization via irradiation studies, yet time-resolved measurements were unable to observe formation of the cis-isomer. In the present study, we are able to observe the formation of the cis-isomer as well as provide timescales of relaxation following initial photoexcitation.
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Affiliation(s)
- Michael D Horbury
- Department of Chemistry, University of Warwick, Library Road, Coventry, CV4 7AL, UK.
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16
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García-Prieto FF, Muñoz-Losa A, Luz Sánchez M, Elena Martín M, Aguilar MA. Solvent effects on de-excitation channels in the p-coumaric acid methyl ester anion, an analogue of the photoactive yellow protein (PYP) chromophore. Phys Chem Chem Phys 2016; 18:27476-27485. [DOI: 10.1039/c6cp03541h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Environmental effects on the deactivation channels of the PYP chromophore in the gas phase and water solution are compared at the CASPT2//CASSCF/cc-pVDZ level.
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Affiliation(s)
| | - Aurora Muñoz-Losa
- Institute of Theoretical Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - M. Luz Sánchez
- Área de Química Física
- University of Extremadura
- 06006 Badajoz
- Spain
| | - M. Elena Martín
- Área de Química Física
- University of Extremadura
- 06006 Badajoz
- Spain
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17
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García-Prieto FF, Aguilar MA, Galván IF, Muñoz-Losa A, Olivares del Valle FJ, Sánchez ML, Martín ME. Substituent and Solvent Effects on the UV–vis Absorption Spectrum of the Photoactive Yellow Protein Chromophore. J Phys Chem A 2015; 119:5504-14. [DOI: 10.1021/acs.jpca.5b01434] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- F. Fernández García-Prieto
- Área
de Química Física, University of Extremadura, Avda.
Elvas s/n, José M.a Viguera Lobo Building, 06071 Badajoz, Spain
| | - M. A. Aguilar
- Área
de Química Física, University of Extremadura, Avda.
Elvas s/n, José M.a Viguera Lobo Building, 06071 Badajoz, Spain
| | - I. Fdez. Galván
- Department
of Chemistry−Ångström, The Theoretical Chemistry
Programme, Uppsala University, P.O. Box 518, SE-751 20 Uppsala, Sweden
| | - A. Muñoz-Losa
- Área
de Química Física, University of Extremadura, Avda.
Elvas s/n, José M.a Viguera Lobo Building, 06071 Badajoz, Spain
| | - F. J. Olivares del Valle
- Área
de Química Física, University of Extremadura, Avda.
Elvas s/n, José M.a Viguera Lobo Building, 06071 Badajoz, Spain
| | - M. L. Sánchez
- Área
de Química Física, University of Extremadura, Avda.
Elvas s/n, José M.a Viguera Lobo Building, 06071 Badajoz, Spain
| | - M. E. Martín
- Área
de Química Física, University of Extremadura, Avda.
Elvas s/n, José M.a Viguera Lobo Building, 06071 Badajoz, Spain
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18
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Gromov EV. Unveiling the mechanism of photoinduced isomerization of the photoactive yellow protein (PYP) chromophore. J Chem Phys 2014; 141:224308. [DOI: 10.1063/1.4903174] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Evgeniy V. Gromov
- Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Heidelberg, Germany
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19
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Frutos-Puerto S, Muñoz-Losa A, Martín ME, Aguilar MA. Theoretical study of the absorption and emission spectra of the anionic p-coumaric methyl ester in gas phase and in solution. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.04.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Nath NK, Manoj K, Gâz AŞ, Naumov P. Visible-Light-Induced Photodimerization of a Photoactive Yellow Protein (PYP) Chromophore Model in a Single Crystal. Chemistry 2013; 19:8094-9. [DOI: 10.1002/chem.201300427] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2013] [Indexed: 11/06/2022]
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21
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pH dependence of the photoactive yellow protein photocycle investigated by time-resolved crystallography. Biophys J 2012; 102:325-32. [PMID: 22339869 DOI: 10.1016/j.bpj.2011.11.4021] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 11/21/2011] [Accepted: 11/29/2011] [Indexed: 11/21/2022] Open
Abstract
Visualizing the three-dimensional structures of a protein during its biological activity is key to understanding its mechanism. In general, protein structure and function are pH-dependent. Changing the pH provides new insights into the mechanisms that are involved in protein activity. Photoactive yellow protein (PYP) is a signaling protein that serves as an ideal model for time-dependent studies on light-activated proteins. Its photocycle is studied extensively under different pH conditions. However, the structures of the intermediates remain unknown until time-resolved crystallography is employed. With the newest beamline developments, a comprehensive time series of Laue data can now be collected from a single protein crystal. This allows us to vary the pH. Here we present the first structure, to our knowledge, of a short-lived protein-inhibitor complex formed in the pB state of the PYP photocycle at pH 4. A water molecule that is transiently stabilized in the chromophore active site prevents the relaxation of the chromophore back to the trans configuration. As a result, the dark-state recovery is slowed down dramatically. At pH 9, PYP stops cycling through the pB state altogether. The electrostatic environment in the chromophore-binding site is the likely reason for this altered kinetics at different pH values.
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22
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Changenet-Barret P, Lacombat F, Plaza P. Reaction-coordinate tracking in the excited-state deactivation of the photoactive yellow protein chromophore in solution. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.03.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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23
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Gromov EV, Burghardt I, Köppel H, Cederbaum LS. Native hydrogen bonding network of the photoactive yellow protein (PYP) chromophore: Impact on the electronic structure and photoinduced isomerization. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.01.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Zuev D, Bravaya KB, Makarova MV, Krylov AI. Effect of microhydration on the electronic structure of the chromophores of the photoactive yellow and green fluorescent proteins. J Chem Phys 2011; 135:194304. [DOI: 10.1063/1.3660350] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Boggio-Pasqua M, Groenhof G. Controlling the photoreactivity of the photoactive yellow protein chromophore by substituting at the p-coumaric acid group. J Phys Chem B 2011; 115:7021-8. [PMID: 21561119 PMCID: PMC3102441 DOI: 10.1021/jp108977x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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We have performed ab initio CASSCF, CASPT2, and EOM-CCSD calculations on doubly deprotonated p-coumaric acid (pCA2−), the chromophore precursor of the photoactive yellow protein. The results of the calculations demonstrate that pCA2− can undergo only photoisomerization of the double bond. In contrast, the chromophore derivative with the acid replaced by a ketone (p-hydroxybenzylidene acetone, pCK−) undergoes both single- and double-bond photoisomerization, with the single-bond relaxation channel more favorable than the double-bond channel. The substitution alters the nature of the first excited states and the associated potential energy landscape. The calculations show that the electronic nature of the first two (π,π*) excited states are interchanged in vacuo due to the substitution. In pCK−, the first excited state is a charge-transfer (CT π,π*) state, in which the negative charge has migrated from the phenolate ring onto the alkene tail of the chromophore, whereas the locally excited (LE π,π*) state, in which the excitation involves the orbitals on the phenol ring, lies higher in energy and is the fourth excited state. In pCA2−, the CT state is higher in energy due the presence of a negative charge on the tail of the chromophore, and the first excited state is the LE state. In isolated pCA2−, there is a 68 kJ/mol barrier for double-bond photoisomerization on the potential energy surface of this LE state. In water, however, hydrogen bonding with water molecules reduces this barrier to 9 kJ/mol. The barrier separates the local trans minimum near the Franck−Condon region from the global minimum on the excited-state potential energy surface. The lowest energy conical intersection was located near this minimum. In contrast to pCK−, single-bond isomerization is highly unfavorable both in the LE and CT states of pCA2−. These results demonstrate that pCA2− can only decay efficiently in water and exclusively by double-bond photoisomerization. These findings provide a rationale for the experimental observations that pCA2− has both a longer excited-state lifetime and a higher isomerization quantum yield than pCK−.
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Affiliation(s)
- Martial Boggio-Pasqua
- Laboratoire de Chimie et Physique Quantiques, IRSAMC, CNRS et Université de Toulouse, Toulouse, France
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26
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Loukou C, Changenet-Barret P, Rager MN, Plaza P, Martin MM, Mallet JM. The design, synthesis and photochemical study of a biomimetic cyclodextrin model of photoactive yellow protein (PYP). Org Biomol Chem 2011; 9:2209-18. [PMID: 21301710 DOI: 10.1039/c0ob00646g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The design, synthesis and study of the photophysical and photochemical properties of the first biomimetic cyclodextrin (CD) model of photoactive yellow protein (PYP) are described. This model bears a deprotonated trans-p-coumaric acid chromophore, covalently linked via a cysteine moiety to a permethylated 6-monoamino β-CD. NMR and UV/Visible spectroscopy studies showed the formation of strong self-inclusion complexes in water at basic pH. Steady-state photolysis demonstrated that, unlike the free chromophore in solution, excitation of the model molecule leads to the formation of a photoproduct identified as the cis isomer by NMR spectroscopy. These observations provide evidence that the restricted CD cavity offers a promising framework for the design of biomimetic models of the PYP hydrophobic pocket.
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Affiliation(s)
- Christina Loukou
- Département de Chimie, UMR-CNRS 7203, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, Cedex 05, France
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27
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Wang Y, Li H. Excited state geometry of photoactive yellow protein chromophore: A combined conductorlike polarizable continuum model and time-dependent density functional study. J Chem Phys 2010; 133:034108. [DOI: 10.1063/1.3462248] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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28
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Usman A, Asahi T, Sugiyama T, Masuhara H, Tohnai N, Miyata M. Photochemical Reaction of p-hydroxycinnamic-thiophenyl Ester in the Microcrystalline State. J Phys Chem B 2010; 114:14233-40. [DOI: 10.1021/jp909850r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Anwar Usman
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan, Department of Applied Physics, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan, Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan, and Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka
| | - Tsuyoshi Asahi
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan, Department of Applied Physics, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan, Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan, and Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka
| | - Teruki Sugiyama
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan, Department of Applied Physics, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan, Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan, and Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka
| | - Hiroshi Masuhara
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan, Department of Applied Physics, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan, Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan, and Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka
| | - Norimitsu Tohnai
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan, Department of Applied Physics, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan, Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan, and Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka
| | - Mikiji Miyata
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan, Department of Applied Physics, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan, Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan, and Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka
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29
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Changenet-Barret P, Loukou C, Ley C, Lacombat F, Plaza P, Mallet JM, Martin MM. Primary photodynamics of a biomimetic model of photoactive yellow protein (PYP). Phys Chem Chem Phys 2010; 12:13715-23. [DOI: 10.1039/c0cp00618a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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30
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Virshup AM, Punwong C, Pogorelov TV, Lindquist BA, Ko C, Martínez TJ. Photodynamics in Complex Environments: Ab Initio Multiple Spawning Quantum Mechanical/Molecular Mechanical Dynamics. J Phys Chem B 2008; 113:3280-91. [DOI: 10.1021/jp8073464] [Citation(s) in RCA: 247] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aaron M. Virshup
- Center for Biophysics and Computational Biology, Department of Chemistry, and Department of Physics, University of Illinois, Urbana, Illinois, 61801
| | - Chutintorn Punwong
- Center for Biophysics and Computational Biology, Department of Chemistry, and Department of Physics, University of Illinois, Urbana, Illinois, 61801
| | - Taras V. Pogorelov
- Center for Biophysics and Computational Biology, Department of Chemistry, and Department of Physics, University of Illinois, Urbana, Illinois, 61801
| | - Beth A. Lindquist
- Center for Biophysics and Computational Biology, Department of Chemistry, and Department of Physics, University of Illinois, Urbana, Illinois, 61801
| | - Chaehyuk Ko
- Center for Biophysics and Computational Biology, Department of Chemistry, and Department of Physics, University of Illinois, Urbana, Illinois, 61801
| | - Todd J. Martínez
- Center for Biophysics and Computational Biology, Department of Chemistry, and Department of Physics, University of Illinois, Urbana, Illinois, 61801
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31
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Electrostatic control of photoisomerization in the photoactive yellow protein chromophore: Ab initio multiple spawning dynamics. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.05.029] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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Putschögl M, Zirak P, Penzkofer A. Absorption and emission behaviour of trans-p-coumaric acid in aqueous solutions and some organic solvents. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2007.10.031] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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Gromov EV, Burghardt I, Hynes JT, Köppel H, Cederbaum LS. Electronic structure of the photoactive yellow protein chromophore: Ab initio study of the low-lying excited singlet states. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2007.04.033] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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34
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Changenet-Barret P, Plaza P, Martin MM, Chosrowjan H, Taniguchi S, Mataga N, Imamoto Y, Kataoka M. Role of arginine 52 on the primary photoinduced events in the PYP photocycle. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2006.12.027] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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35
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Berná J, Brouwer AM, Fazio SM, Haraszkiewicz N, Leigh DA, Lennon CM. A rotaxane mimic of the photoactive yellow protein chromophore environment: effects of hydrogen bonding and mechanical interlocking on a coumaric amide derivative. Chem Commun (Camb) 2007:1910-2. [PMID: 17695226 DOI: 10.1039/b618781a] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrogen bonding in a [2]rotaxane is shown to stabilise the phenolate anion of a coumaric amide chromophore by almost 3 pKa units; however, the effect on the UV spectral shift in the anion is small and, significantly given the photochemistry of PYP, despite the hydrogen bonding olefin photoisomerisation in the anionic rotaxane remains heavily suppressed.
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Affiliation(s)
- José Berná
- Van 't Hqff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 129, 1018 WS, Amsterdam, The Netherlands
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36
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Brouwer AM, Fazio SM, Haraszkiewicz N, Leigh DA, Lennon CM. Coumaric amide rotaxanes: effects of hydrogen bonding and mechanical interlocking on the photochemistry and photophysics. Photochem Photobiol Sci 2007; 6:480-6. [PMID: 17404644 DOI: 10.1039/b618795a] [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] [Indexed: 01/17/2023]
Abstract
Secondary amide derivatives of coumaric and ferulic acid are shown to undergo photoisomerization, forming a photostationary mixture of E- and Z-isomers. When the same chromophores are incorporated in rotaxanes, the extent of conversion to the Z-isomers is much smaller. Low temperature fluorescence experiments show that the energy barrier for non-radiative decay of the excited state is higher in the rotaxanes than in the corresponding threads, but the barriers are low in all cases.
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Affiliation(s)
- Albert M Brouwer
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 129, 1018, WS Amsterdam, The Netherlands.
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37
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Espagne A, Paik DH, Changenet-Barret P, Plaza P, Martin MM, Zewail AH. Ultrafast light-induced response of photoactive yellow protein chromophore analogues. Photochem Photobiol Sci 2007; 6:780-7. [PMID: 17609772 DOI: 10.1039/b700927e] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The fluorescence decays of several analogues of the photoactive yellow protein (PYP) chromophore in aqueous solution have been measured by femtosecond fluorescence up-conversion and the corresponding time-resolved fluorescence spectra have been reconstructed. The native chromophore of PYP is a thioester derivative of p-coumaric acid in its trans deprotonated form. Fluorescence kinetics are reported for a thioester phenyl analogue and for two analogues where the thioester group has been changed to amide and carboxylate groups. The kinetics are compared to those we previously reported for the analogues bearing ketone and ester groups. The fluorescence decays of the full series are found to lie in the 1-10 ps range depending on the electron-acceptor character of the substituent, in good agreement with the excited-state relaxation kinetics extracted from transient absorption measurements. Steady-state photolysis is also examined and found to depend strongly on the nature of the substituent. While it has been shown that the ultrafast light-induced response of the chromophore in PYP is controlled by the properties of the protein nanospace, the present results demonstrate that, in solution, the relaxation dynamics and pathway of the chromophore is controlled by its electron donor-acceptor structure: structures of stronger electron donor-acceptor character lead to faster decays and less photoisomerisation.
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Affiliation(s)
- Agathe Espagne
- UMR CNRS-ENS 8640 PASTEUR, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75005, Paris, France
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38
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Espagne A, Changenet-Barret P, Baudin JB, Plaza P, Martin MM. Photoinduced charge shift as the driving force for the excited-state relaxation of analogues of the Photoactive Yellow Protein chromophore in solution. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.06.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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39
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Usman A, Masuhara H, Asahi T. trans−cis Photoisomerization of a Photoactive Yellow Protein Model Chromophore in Crystalline Phase. J Phys Chem B 2006; 110:20085-8. [PMID: 17034177 DOI: 10.1021/jp064984b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have studied the photoinduced trans/cis isomerization of the protonated form of p-hydroxycinnamic thiophenyl ester, a model chromophore of the photoactive yellow protein (PYP), in crystalline phase, by both fluorescence and infrared spectroscopies. The conversion from trans to cis configuration is revealed by a shift of the fluorescence peak and by inspection of the infrared maker bands. The crystal packing apparently stabilizes the cis photoproduct, suggesting different environmental effects from the solvent molecules for this model chromophore in liquid solutions or from the amino acid residues for the PYP chromophore.
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40
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Espagne A, Paik DH, Changenet-Barret P, Martin MM, Zewail AH. Ultrafast Photoisomerization of Photoactive Yellow Protein Chromophore Analogues in Solution: Influence of the Protonation State. Chemphyschem 2006; 7:1717-26. [PMID: 16847839 DOI: 10.1002/cphc.200600137] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We investigate solvent viscosity and polarity effects on the photoisomerization of the protonated and deprotonated forms of two analogues of the photoactive yellow protein (PYP) chromophore. These are trans-p-hydroxybenzylidene acetone and trans-p-hydroxyphenyl cinnamate, studied in solutions of different polarity and viscosity at room temperature, by means of femtosecond fluorescence up-conversion. The fluorescence lifetimes of the protonated forms are found to be barely sensitive to solvent viscosity, and to increase with increasing solvent polarity. In contrast, the fluorescence decays of the deprotonated forms are significantly slowed down in viscous media and accelerated in polar solvents. These results elucidate the dramatic influence of the protonation state of the PYP chromophore analogues on their photoinduced dynamics. The viscosity and polarity effects are, respectively, interpreted in terms of different isomerization coordinates and charge redistribution in S(1). A trans-to-cis isomerization mechanism involving mainly the ethylenic double-bond torsion and/or solvation is proposed for the anionic forms, whereas "concerted" intramolecular motions are proposed for the neutral forms.
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Affiliation(s)
- Agathe Espagne
- UMR CNRS-ENS 8640 Pasteur, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
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