1
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Ball R, Jackson JA, Simeon T, Schatz GC, Shafer JC, Anna JM. Vibrational anisotropy decay resolves rare earth binding induced conformational change in DTPA. Phys Chem Chem Phys 2024; 26:10078-10090. [PMID: 38482833 DOI: 10.1039/d4cp00673a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
Elucidating the relationship between metal-ligand interactions and the associated conformational change of the ligand is critical for understanding the separation of lanthanides via ion binding. Here we examine DTPA, a multidentate ligand that binds lanthanides, in its free and metal bound conformations using ultrafast polarization dependent vibrational spectroscopy. The polarization dependent pump-probe spectra were analyzed to extract the isotropic and anisotropic response of DTPA's carbonyl groups in the 1550-1650 cm-1 spectral region. The isotropic response reports on the population relaxation of the carbonyl stretching modes. We find that the isotropic response is influenced by the identity of the metal ion. The anisotropy decay of the carbonyl stretching modes reveals a faster decay in the lanthanide-DTPA complexes than in the free DTPA ligand. We attribute the anisotropy decay to energy transfer among the different carbonyl sites - where the conformational change results in an increased coupling between the carbonyl sites of metal-bound DTPA complexes. DFT calculations and theoretical simulations of energy transfer suggest that the carbonyl sites are more strongly coupled in the metal-bound conformations compared to the free DTPA. The stronger coupling in the metal bound DTPA conformation leads to efficient energy transfer among the different carbonyl sites. Comparing the rate of anisotropy decay across the series of metal bound DTPA complexes we find that the anisotropy is sensitive to the charge density of the central metal ion, and thus can serve as a molecular scale reporter for lanthanide ion binding.
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Affiliation(s)
- Ranadeb Ball
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Jessica A Jackson
- Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, USA
| | - Tomekia Simeon
- School of STEM, Dillard University, New Orleans, Louisiana 70122, USA
| | - George C Schatz
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
| | - Jenifer C Shafer
- Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, USA
| | - Jessica M Anna
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Department of Chemistry, University of Pittsburgh, Pennsylvania 15260, USA.
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2
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Bühl E, Resler T, Lam R, Asido M, Bamberg E, Schlesinger R, Bamann C, Heberle J, Wachtveitl J. Assessing the Role of R120 in the Gating of CrChR2 by Time-Resolved Spectroscopy from Femtoseconds to Seconds. J Am Chem Soc 2023; 145:21832-21840. [PMID: 37773976 DOI: 10.1021/jacs.3c05399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/01/2023]
Abstract
The light-gated ion channel channelrhodopsin-2 from Chlamydomonas reinhardtii (CrChR2) is the most frequently used optogenetic tool in neurosciences. However, the precise molecular mechanism of the channel opening and the correlation among retinal isomerization, the photocycle, and the channel activity of the protein are missing. Here, we present electrophysiological and spectroscopic investigations on the R120H variant of CrChR2. R120 is a key residue in an extended network linking the retinal chromophore to several gates of the ion channel. We show that despite the deficient channel activity, the photocycle of the variant is intact. In a comparative study for R120H and the wild type, we resolve the vibrational changes in the spectral range of the retinal and amide I bands across the time range from femtoseconds to seconds. Analysis of the amide I mode reveals a significant impairment of the ultrafast protein response after retinal excitation. We conclude that channel opening in CrChR2 is prepared immediately after retinal excitation. Additionally, chromophore isomerization is essential for both photocycle and channel activities, although both processes can occur independently.
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Affiliation(s)
- Elena Bühl
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue Strasse 7, 60438 Frankfurt, Germany
| | - Tom Resler
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Rebecca Lam
- Max Planck Institute of Biophysics, Max-von-Laue Strasse 3, 60438 Frankfurt am Main, Germany
| | - Marvin Asido
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue Strasse 7, 60438 Frankfurt, Germany
| | - Ernst Bamberg
- Max Planck Institute of Biophysics, Max-von-Laue Strasse 3, 60438 Frankfurt am Main, Germany
| | - Ramona Schlesinger
- Department of Physics, Genetic Biophysics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Christian Bamann
- Max Planck Institute of Biophysics, Max-von-Laue Strasse 3, 60438 Frankfurt am Main, Germany
| | - Joachim Heberle
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Josef Wachtveitl
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue Strasse 7, 60438 Frankfurt, Germany
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3
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Edun DN, Cracchiolo OM, Serrano AL. A theoretical analysis of coherent cross-peaks in polarization selective 2DIR for detection of cross-α fibrils. J Chem Phys 2022; 156:035102. [DOI: 10.1063/5.0070553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Dean N. Edun
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Olivia M. Cracchiolo
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Arnaldo L. Serrano
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
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4
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Valentine ML, Al-Mualem ZA, Baiz CR. Pump Slice Amplitudes: A Simple and Robust Method for Connecting Two-Dimensional Infrared and Fourier Transform Infrared Spectra. J Phys Chem A 2021; 125:6498-6504. [PMID: 34259508 DOI: 10.1021/acs.jpca.1c04558] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ultrafast two-dimensional infrared (2D IR) spectroscopy and Fourier transform infrared (FTIR) spectroscopy are often performed in tandem, with FTIR typically used to interpret and provide hypotheses for 2D IR experiments. Comparisons between 2D IR and FTIR spectra can also be used to examine the structure and orientation in systems of coupled vibrational chromophores. The most common method for comparing 2D IR and FTIR lineshapes, the diagonal slice method, contains significant artifacts when applied to oscillators with low anharmonicities. Here, we introduce a new technique, the pump slice amplitude (PSA) method, for relating 2D IR lineshapes to FTIR lineshapes and compare PSAs against diagonal slices using theoretical and experimental spectra. We find that PSAs are significantly more similar to FTIR lineshapes than diagonal slices in systems with low anharmonicity.
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Affiliation(s)
- Mason L Valentine
- Department of Chemistry, University of Texas at Austin, Austin 78712, United States
| | - Ziareena A Al-Mualem
- Department of Chemistry, University of Texas at Austin, Austin 78712, United States
| | - Carlos R Baiz
- Department of Chemistry, University of Texas at Austin, Austin 78712, United States
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5
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Chen X, Cui Y, Gobeze HB, Kuroda DG. Assessing the Location of Ionic and Molecular Solutes in a Molecularly Heterogeneous and Nonionic Deep Eutectic Solvent. J Phys Chem B 2020; 124:4762-4773. [PMID: 32421342 PMCID: PMC7304071 DOI: 10.1021/acs.jpcb.0c02482] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
![]()
Deep
eutectic solvents (DES) are emerging sustainable designer
solvents viewed as greener and better alternatives to ionic liquids.
Nonionic DESs possess unique properties such as viscosity and hydrophobicity
that make them desirable in microextraction applications such as oil-spill
remediation. This work builds upon a nonionic DES, NMA–LA DES,
previously designed by our group. The NMA–LA DES presents a
rich nanoscopic morphology that could be used to allocate solutes
of different polarities. In this work, the possibility of solvating
different solutes within the nanoscopically heterogeneous molecular
structure of the NMA–LA DES is investigated using ionic and
molecular solutes. In particular, the localized vibrational transitions
in these solutes are used as reporters of the DES molecular structure
via vibrational spectroscopy. The FTIR and 2DIR data suggest that
the ionic solute is confined in a polar and continuous domain formed
by NMA, clearly sensing the direct effect of the change in NMA concentration.
In the case of the molecular nonionic and polar solute, the data indicates
that the solute resides in the interface between the polar and nonpolar
domains. Finally, the results for the nonpolar and nonionic solute
(W(CO)6) are unexpected and less conclusive. Contrary to
its polarity, the data suggest that the W(CO)6 resides
within the NMA polar domain of the DES, probably by inducing a domain
restructuring in the solvent. However, the data are not conclusive
enough to discard the possibility that the restructuring comprises
not only the polar domain but also the interface. Overall, our results
demonstrate that the NMA–LA DES has nanoscopic domains with
affinity to particular molecular properties, such as polarity. Thus,
the presented results have a direct implication to separation science.
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Affiliation(s)
- Xiaobing Chen
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Yaowen Cui
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Habtom B Gobeze
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Daniel G Kuroda
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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6
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Chen X, Fulfer KD, Woodard KT, Kuroda DG. Structure and Dynamics of the Lithium-Ion Solvation Shell in Ureas. J Phys Chem B 2019; 123:9889-9898. [DOI: 10.1021/acs.jpcb.9b07623] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xiaobing Chen
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Kristen D. Fulfer
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
- Chemistry Program, Centre College, Danville, Kentucky 40422, United States
| | - Kaylee T. Woodard
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Daniel G. Kuroda
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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7
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Roberson MG, Smith DK, White SM, Wallace IS, Tucker MJ. Interspecies Bombolitins Exhibit Structural Diversity upon Membrane Binding, Leading to Cell Specificity. Biophys J 2019; 116:1064-1074. [PMID: 30824115 DOI: 10.1016/j.bpj.2019.02.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 02/07/2019] [Accepted: 02/08/2019] [Indexed: 02/05/2023] Open
Abstract
Bombolitins, a class of peptides produced by bees of the genus Bombus, target and disrupt cellular membranes, leading to lysis. Antimicrobial peptides exhibit various mechanisms of action resulting from the interplay between peptide structure, lipid composition, and cellular target membrane selectivity. Herein, two bombolitins displaying significant amino-acid-sequence similarity, BII and BL6, were assessed for antimicrobial activity as well as correlated dodecylphosphocholine (DPC) micelle binding and membrane-induced peptide conformational changes. Infrared and circular dichroism spectroscopies were used to assess the structure-function relationship of each bombolitin, and the results indicate that BII forms a rigid and helically ordered secondary structure upon binding to DPC micelles, whereas BL6 largely lacks secondary structural order. Moreover, the binding affinity of each peptide to DPC micelles was determined, revealing that BL6 displayed a difference in binding affinity by over two orders of magnitude. Further investigations into the growth-inhibitory activity of the two bombolitins were performed against Escherichia coli and Saccharomyces cerevisiae. Interestingly, BII specifically targeted S. cerevisiae, whereas BL6 more effectively inhibited E. coli growth. Overall, the antimicrobial selectivity and specificity of BII and BL6 are largely dependent on the primary as well as secondary structural content of the peptides and the membrane composition.
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Affiliation(s)
| | - Devin K Smith
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, Nevada
| | - Simon M White
- Department of Chemistry, University of Nevada, Reno, Reno, Nevada
| | - Ian S Wallace
- Department of Chemistry, University of Nevada, Reno, Reno, Nevada; Department of Biochemistry and Molecular Biology, University of Nevada, Reno, Nevada.
| | - Matthew J Tucker
- Department of Chemistry, University of Nevada, Reno, Reno, Nevada.
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8
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9
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Zhang X, Kumar R, Kuroda DG. Acetate ion and its interesting solvation shell structure and dynamics. J Chem Phys 2018. [DOI: 10.1063/1.5019363] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Xiaoliu Zhang
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Revati Kumar
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Daniel G. Kuroda
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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10
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Verma PK, Kundu A, Puretz MS, Dhoonmoon C, Chegwidden OS, Londergan CH, Cho M. The Bend+Libration Combination Band Is an Intrinsic, Collective, and Strongly Solute-Dependent Reporter on the Hydrogen Bonding Network of Liquid Water. J Phys Chem B 2017; 122:2587-2599. [DOI: 10.1021/acs.jpcb.7b09641] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pramod Kumar Verma
- Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
| | - Achintya Kundu
- Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
| | - Matthew S. Puretz
- Department of Chemistry, Haverford College, 370 Lancaster Avenue, Haverford, Pennsylvania 19041, United States
| | - Charvanaa Dhoonmoon
- Department of Chemistry, Haverford College, 370 Lancaster Avenue, Haverford, Pennsylvania 19041, United States
| | - Oriana S. Chegwidden
- Department of Chemistry, Haverford College, 370 Lancaster Avenue, Haverford, Pennsylvania 19041, United States
| | - Casey H. Londergan
- Department of Chemistry, Haverford College, 370 Lancaster Avenue, Haverford, Pennsylvania 19041, United States
| | - Minhaeng Cho
- Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
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11
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Ostrander JS, Knepper R, Tappan AS, Kay JJ, Zanni MT, Farrow DA. Energy Transfer Between Coherently Delocalized States in Thin Films of the Explosive Pentaerythritol Tetranitrate (PETN) Revealed by Two-Dimensional Infrared Spectroscopy. J Phys Chem B 2017; 121:1352-1361. [DOI: 10.1021/acs.jpcb.6b09879] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joshua S. Ostrander
- Department
of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Robert Knepper
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | | | - Jeffrey J. Kay
- Sandia National Laboratories, Livermore, California 94551, United States
| | - Martin T. Zanni
- Department
of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Darcie A. Farrow
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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12
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Fulfer KD, Kuroda DG. A comparison of the solvation structure and dynamics of the lithium ion in linear organic carbonates with different alkyl chain lengths. Phys Chem Chem Phys 2017; 19:25140-25150. [DOI: 10.1039/c7cp05096h] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The structure and dynamics of electrolytes composed of lithium hexafluorophosphate (LiPF6) in dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate were investigated using a combination of linear and two-dimensional infrared spectroscopies.
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Affiliation(s)
- K. D. Fulfer
- Department of Chemistry
- Louisiana State University
- Baton Rouge
- USA
| | - D. G. Kuroda
- Department of Chemistry
- Louisiana State University
- Baton Rouge
- USA
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13
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Fournier JA, Carpenter W, De Marco L, Tokmakoff A. Interplay of Ion–Water and Water–Water Interactions within the Hydration Shells of Nitrate and Carbonate Directly Probed with 2D IR Spectroscopy. J Am Chem Soc 2016; 138:9634-45. [DOI: 10.1021/jacs.6b05122] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Joseph A. Fournier
- Department
of Chemistry, Institute for Biophysical Dynamics, and James Franck
Institute, The University of Chicago, Chicago, Illinois 60637, United States
| | - William Carpenter
- Department
of Chemistry, Institute for Biophysical Dynamics, and James Franck
Institute, The University of Chicago, Chicago, Illinois 60637, United States
| | - Luigi De Marco
- Department
of Chemistry, Institute for Biophysical Dynamics, and James Franck
Institute, The University of Chicago, Chicago, Illinois 60637, United States
- Department
of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Andrei Tokmakoff
- Department
of Chemistry, Institute for Biophysical Dynamics, and James Franck
Institute, The University of Chicago, Chicago, Illinois 60637, United States
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14
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Lotze S, Bakker HJ. Structure and dynamics of a salt-bridge model system in water and DMSO. J Chem Phys 2015; 142:212436. [DOI: 10.1063/1.4918904] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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15
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Heiles S, Cooper RJ, DiTucci MJ, Williams ER. Hydration of guanidinium depends on its local environment. Chem Sci 2015; 6:3420-3429. [PMID: 28706704 PMCID: PMC5490459 DOI: 10.1039/c5sc00618j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 04/14/2015] [Indexed: 01/10/2023] Open
Abstract
Hydration of gaseous guanidinium (Gdm+) with up to 100 water molecules attached was investigated using infrared photodissociation spectroscopy in the hydrogen stretch region between 2900 and 3800 cm-1. Comparisons to IR spectra of low-energy computed structures indicate that at small cluster size, water interacts strongly with Gdm+ with three inner shell water molecules each accepting two hydrogen bonds from adjacent NH2 groups in Gdm+. Comparisons to results for tetramethylammonium (TMA+) and Na+ enable structural information for larger clusters to be obtained. The similarity in the bonded OH region for Gdm(H2O)20+vs. Gdm(H2O)100+ and the similarity in the bonded OH regions between Gdm+ and TMA+ but not Na+ for clusters with <50 water molecules indicate that Gdm+ does not significantly affect the hydrogen-bonding network of water molecules at large size. These results indicate that the hydration around Gdm+ changes for clusters with more than about eight water molecules to one in which inner shell water molecules only accept a single H-bond from Gdm+. More effective H-bonding drives this change in inner-shell water molecule binding to other water molecules. These results show that hydration of Gdm+ depends on its local environment, and that Gdm+ will interact with water even more strongly in an environment where water is partially excluded, such as the surface of a protein. This enhanced hydration in a limited solvation environment may provide new insights into the effectiveness of Gdm+ as a protein denaturant.
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Affiliation(s)
- Sven Heiles
- Department of Chemistry , University of California , B42 Hildebrand Hall , Berkeley , CA 94720 , USA .
| | - Richard J Cooper
- Department of Chemistry , University of California , B42 Hildebrand Hall , Berkeley , CA 94720 , USA .
| | - Matthew J DiTucci
- Department of Chemistry , University of California , B42 Hildebrand Hall , Berkeley , CA 94720 , USA .
| | - Evan R Williams
- Department of Chemistry , University of California , B42 Hildebrand Hall , Berkeley , CA 94720 , USA .
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16
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Huerta-Viga A, Domingos SR, Amirjalayer S, Woutersen S. A salt-bridge structure in solution revealed by 2D-IR spectroscopy. Phys Chem Chem Phys 2015; 16:15784-6. [PMID: 24676430 DOI: 10.1039/c4cp00233d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Salt bridges are important interactions for the stability of protein conformations, but up to now it has been difficult to determine salt-bridge geometries in solution. Here we characterize the spatial structure of a salt bridge between guanidinium (Gdm(+)) and acetate (Ac(-)) using two-dimensional vibrational (2D-IR) spectroscopy. We find that as a result of salt bridge formation there is a significant change in the infrared response of Gdm(+) and Ac(-), and cross peaks between them appear in the 2D-IR spectrum. From the 2D-IR spectrum we determine the relative orientation of the transition-dipole moments of the vibrational modes of Gdm(+) and Ac(-), as well as the coupling between them.
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Affiliation(s)
- Adriana Huerta-Viga
- Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, Amsterdam, The Netherlands.
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17
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Panman MR, van Dijk CN, Meuzelaar H, Woutersen S. Communication: Nanosecond folding dynamics of an alpha helix: Time-dependent 2D-IR cross peaks observed using polarization-sensitive dispersed pump-probe spectroscopy. J Chem Phys 2015; 142:041103. [DOI: 10.1063/1.4906456] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Matthijs R. Panman
- Van ’t Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Amsterdam, The Netherlands
| | - Chris N. van Dijk
- Van ’t Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Amsterdam, The Netherlands
| | - Heleen Meuzelaar
- Van ’t Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Amsterdam, The Netherlands
| | - S. Woutersen
- Van ’t Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Amsterdam, The Netherlands
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18
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Prampolini G, Yu P, Pizzanelli S, Cacelli I, Yang F, Zhao J, Wang J. Structure and Dynamics of Ferrocyanide and Ferricyanide Anions in Water and Heavy Water: An Insight by MD Simulations and 2D IR Spectroscopy. J Phys Chem B 2014; 118:14899-912. [DOI: 10.1021/jp511391b] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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19
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Yu P, Yang F, Zhao J, Wang J. Hydration Dynamics of Cyanoferrate Anions Examined by Ultrafast Infrared Spectroscopy. J Phys Chem B 2014; 118:3104-14. [DOI: 10.1021/jp410614f] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Pengyun Yu
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Fan Yang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Juan Zhao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Jianping Wang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
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20
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Chuntonov L, Ma J. Quantum process tomography quantifies coherence transfer dynamics in vibrational exciton. J Phys Chem B 2013; 117:13631-8. [PMID: 24079417 DOI: 10.1021/jp4075493] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Quantum coherence has been a subject of great interest in many scientific disciplines. However, detailed characterization of the quantum coherence in molecular systems, especially its transfer and relaxation mechanisms, still remains a major challenge. The difficulties arise in part because the spectroscopic signatures of the coherence transfer are typically overwhelmed by other excitation-relaxation processes. We use quantum process tomography (QPT) via two-dimensional infrared spectroscopy to quantify the rate of the elusive coherence transfer between two vibrational exciton states. QPT retrieves the dynamics of the dissipative quantum system directly from the experimental observables. It thus serves as an experimental alternative to theoretical models of the system-bath interaction and can be used to validate these theories. Our results for coupled carbonyl groups of a diketone molecule in chloroform, used as a benchmark system, reveal the nonsecular nature of the interaction between the exciton and the Markovian bath and open the door for the systematic studies of the dissipative quantum systems dynamics in detail.
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Affiliation(s)
- Lev Chuntonov
- Ultrafast Optical Processes Laboratory, Department of Chemistry, University of Pennsylvania , Philadelphia, PA 19104, United States
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21
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Kuroda DG, Abdo M, Chuntonov L, Smith AB, Hochstrasser RM. Vibrational dynamics of a non-degenerate ultrafast rotor: the (C12,C13)-oxalate ion. J Chem Phys 2013; 139:164514. [PMID: 24182056 PMCID: PMC3829914 DOI: 10.1063/1.4826137] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Accepted: 10/04/2013] [Indexed: 12/17/2022] Open
Abstract
Molecular ions undergoing ultrafast conformational changes on the same time scale of water motions are of significant importance in condensed phase dynamics. However, the characterization of systems with fast molecular motions has proven to be both experimentally and theoretically challenging. Here, we report the vibrational dynamics of the non-degenerate (C12,C13)-oxalate anion, an ultrafast rotor, in aqueous solution. The infrared absorption spectrum of the (C12,C13)-oxalate ion in solution reveals two vibrational transitions separated by approximately 40 cm(-1) in the 1500-1600 cm(-1) region. These two transitions are assigned to vibrational modes mainly localized in each of the carboxylate asymmetric stretch of the ion. Two-dimensional infrared spectra reveal the presence and growth of cross-peaks between these two transitions which are indicative of coupling and population transfer, respectively. A characteristic time of sub-picosecond cross-peaks growth is observed. Ultrafast pump-probe anisotropy studies reveal essentially the same characteristic time for the dipole reorientation. All the experimental data are well modeled in terms of a system undergoing ultrafast population transfer between localized states. Comparison of the experimental observations with simulations reveal a reasonable agreement, although a mechanism including only the fluctuations of the coupling caused by the changes in the dihedral angle of the rotor, is not sufficient to explain the observed ultrafast population transfer.
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Affiliation(s)
- Daniel G Kuroda
- Ultrafast Optical Processes Laboratory, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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22
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Singh PK, Kuroda DG, Hochstrasser RM. An ion's perspective on the molecular motions of nanoconfined water: a two-dimensional infrared spectroscopy study. J Phys Chem B 2013; 117:9775-84. [PMID: 23855349 DOI: 10.1021/jp406725a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The vibrational population relaxation and hydration shell dynamics of the symmetric tricyanomethanide (TCM) anion are investigated in a sodium bis(2-ethylhexyl)sulfosuccinate reverse micelle as a function of the water pool radius. Two-dimensional infrared (IR) spectroscopy in combination with linear absorption and ultrafast IR pump-probe spectroscopy is utilized in this study. Spectroscopic measurements show that the anion has two bands in the 2160-2175 cm(-1) region, each with its own spectroscopic signatures. Analysis of the vibrational dynamics shows that the two vibrational bands are consistent with the anion located either at the interface or in the water pool. The sensitivity of the TCM anion to the environment allows us to unequivocally monitor the vibrational and hydration dynamics of the anion in those two different environments. A TCM anion located at the interface does not show any significant variation of the vibrational dynamics with the water pool size. On the contrary, the TCM anion inside the water pool exhibits a large and nonlinear variation of the vibrational lifetime and the frequency-frequency correlation time with the pool radius. Moreover, for the solvated anion in water pools of 49 Å in radius (W0 = 30), the vibrational lifetime reaches the values observed for the anion in bulk water while the frequency-frequency correlation time shows a characteristic time higher than that observed in the bulk. In addition, for the first time a model is developed and used to explain the observed nonlinear variation of the spectroscopic observables with the pool size. This model attributes the changes in the vibrational dynamics of the TCM anion in the water pool to the slow and radius-dependent water dynamics present in the confined environment of a reverse micelle.
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Affiliation(s)
- Prabhat K Singh
- Ultrafast Optical Processes Laboratory, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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23
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Hamm P, Zewail AH, Fleming GR. A tribute to Robin Hochstrasser. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Chuntonov L, Kuroda DG, Ghosh A, Ma J, Hochstrasser RM. Quantum Beats and Coherence Decay in Degenerate States Split by Solvation. J Phys Chem Lett 2013; 4:1866-1871. [PMID: 23956817 PMCID: PMC3743118 DOI: 10.1021/jz400826a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Coherent dynamics of degenerate quantum states symmetry-broken on the femtosecond timescale is found to exhibit the phenomenon of quantum beats. Frequency-resolved and polarization-selective heterodyned transient grating spectroscopy enabled us to retrieve the oscillation pattern characteristic of the beating in systems undergoing ultrafast dynamical processes. This methodology applies to the general phenomena of coherence dynamics which is important in any ultrafast multidimensional spectroscopy. A particular application to the vibrational spectroscopy of coherence in the degenerate normal modes of the tricyanomethanide anion solvated in water is explored in this study. The relaxation of the cross-polarization transient grating anisotropy is shown to reflect the loss of the vibrational coherence, which is caused by ultrafast dynamics of the water solvation shell.
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Affiliation(s)
- Lev Chuntonov
- Corresponding author, , phone: 215-898-8247, fax: 215-898-0590
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25
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Yang F, Yu P, Zhao J, Wang J. Simultaneously Probing Two Ultrafast Condensed-Phase Molecular Symmetry Breaking Events by Two-Dimensional Infrared Spectroscopy. Chemphyschem 2013; 14:2497-504. [DOI: 10.1002/cphc.201300094] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 04/16/2013] [Indexed: 11/09/2022]
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26
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Kuroda DG, Singh PK, Hochstrasser RM. Differential hydration of tricyanomethanide observed by time resolved vibrational spectroscopy. J Phys Chem B 2013; 117:4354-64. [PMID: 22934602 PMCID: PMC3594387 DOI: 10.1021/jp3069333] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The degenerate transition corresponding to asymmetric stretches of the D(3h) tricyanomethanide anion, C(CN)(3)(-), in aqueous solution was investigated by linear FTIR spectroscopy, femtosecond pump–probe spectroscopy, and 2D IR spectroscopy. Time resolved vibrational spectroscopy shows that water induces vibrational energy transfer between the degenerate asymmetric stretch modes of tricyanomethanide. The frequency–frequency correlation function and the vibrational energy transfer show two significantly different ultrafast time scales. The system is modeled with molecular dynamics simulations and ab initio calculations. A new model for theoretically describing the vibrational dynamics of a degenerate transition is presented. Microscopic models, where water interacts axially and radially with the ion, are suggested for the transition dipole reorientation mechanism.
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Affiliation(s)
| | | | - Robin M. Hochstrasser
- Ultrafast Optical Processes Laboratory, Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
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27
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Thøgersen J, Réhault J, Odelius M, Ogden T, Jena NK, Jensen SJK, Keiding SR, Helbing J. Hydration Dynamics of Aqueous Nitrate. J Phys Chem B 2013; 117:3376-88. [DOI: 10.1021/jp310090u] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jan Thøgersen
- Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus,
Denmark
| | - Julien Réhault
- Institute of Physical
Chemistry, University of Zürich,
Wintherthurerstrasse 190,
CH-8057, Zürich, Switzerland
| | - Michael Odelius
- Department of Physics, Albanova,
Roslagstullbacken 21, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Tom Ogden
- Department of Physics, Albanova,
Roslagstullbacken 21, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Naresh K. Jena
- Department of Physics, Albanova,
Roslagstullbacken 21, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Svend J. Knak Jensen
- Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus,
Denmark
| | - Søren R. Keiding
- Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus,
Denmark
| | - Jan Helbing
- Institute of Physical
Chemistry, University of Zürich,
Wintherthurerstrasse 190,
CH-8057, Zürich, Switzerland
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28
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van der Post ST, Tielrooij KJ, Hunger J, Backus EHG, Bakker HJ. Femtosecond study of the effects of ions and hydrophobes on the dynamics of water. Faraday Discuss 2013; 160:171-89; discussion 207-24. [DOI: 10.1039/c2fd20097j] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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29
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Josefsson I, Eriksson SK, Ottosson N, Öhrwall G, Siegbahn H, Hagfeldt A, Rensmo H, Björneholm O, Odelius M. Collective hydrogen-bond dynamics dictates the electronic structure of aqueous I3−. Phys Chem Chem Phys 2013; 15:20189-96. [DOI: 10.1039/c3cp52866a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Hamm P, Stock G. Vibrational conical intersections as a mechanism of ultrafast vibrational relaxation. PHYSICAL REVIEW LETTERS 2012; 109:173201. [PMID: 23215183 DOI: 10.1103/physrevlett.109.173201] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2012] [Indexed: 06/01/2023]
Abstract
Presenting true crossings of adiabatic potential energy surfaces, conical intersections are a paradigm of ultrafast and efficient electronic relaxation dynamics. The same mechanism is shown to apply also for vibrational conical intersections, which may occur when two high-frequency modes (such as OH stretch vibrations) are coupled to low-frequency modes (such as hydrogen bonding modes). By derivation of a model Hamiltonian and its parametrization for a concrete example, malonaldehyde, the conditions that such conical intersections occur are identified and the consequences for the vibrational dynamics and spectra are demonstrated.
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Affiliation(s)
- Peter Hamm
- Physikalisch-Chemisches Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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31
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Kuroda DG, Hochstrasser RM. Dynamic structures of aqueous oxalate and the effects of counterions seen by 2D IR. Phys Chem Chem Phys 2012; 14:6219-24. [DOI: 10.1039/c2cp23892f] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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32
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Kuroda DG, Hochstrasser RM. Two-dimensional infrared spectral signature and hydration of the oxalate dianion. J Chem Phys 2011; 135:204502. [PMID: 22128938 PMCID: PMC3254581 DOI: 10.1063/1.3658461] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 10/17/2011] [Indexed: 12/14/2022] Open
Abstract
Ultrafast vibrational spectra of the aqueous oxalate ion in the region of its carboxylate asymmetric stretch modes show novel relaxation processes. Two-dimensional infrared vibrational echo spectra and the vibrational dynamics obtained from them along with measurements of the anisotropy decay provide a picture in which the localization of the oxalate vibrational excitation onto the carboxylate groups occurs in ~450 fs. Molecular dynamics simulations are used to characterize the vibrational dynamics in terms of dihedral angle motion between the two carboxylate planes and solvation dynamics. The localization of the oxalate vibrational excitation onto the carboxylates is induced by the fluctuations in the carboxylate vibrational frequencies which are shown by theory and experiment to have a similar correlation time as the anisotropy decay.
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Affiliation(s)
- Daniel G Kuroda
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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33
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Ghosh A, Tucker MJ, Hochstrasser RM. Identification of arginine residues in peptides by 2D-IR echo spectroscopy. J Phys Chem A 2011; 115:9731-8. [PMID: 21539337 PMCID: PMC3162110 DOI: 10.1021/jp201794n] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The CN stretching vibrations of the guanidyl group in the arginine dipeptide side chain are examined by two-dimensional infrared spectroscopy. In D(2)O, the spectra display two distinct diagonal peaks. These nearly degenerate modes undergo ultrafast energy transfer. The energy-transfer rate was determined directly from the 2D-IR spectra to be 1/2.1 ps(-1). The cross peaks in 2D-IR arising from the energy transfer provide a definitive identification of arginine in larger proteins. An example of arginine in the transmembrane protein M2, found in influenza viruses, is given.
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Affiliation(s)
- Ayanjeet Ghosh
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA
| | - Matthew J. Tucker
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA
| | - Robin M. Hochstrasser
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA
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34
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Anharmonic vibrations of nucleobases: Structural basis of one- and two-dimensional infrared spectra for canonical and mismatched base pairs. Sci China Chem 2011. [DOI: 10.1007/s11426-011-4309-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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