1
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Ng Pack G, Rotondaro MC, Shah PP, Mandal A, Erramilli S, Ziegler LD. Two-dimensional infrared spectroscopy from the gas to liquid phase: density dependent J-scrambling, vibrational relaxation, and the onset of liquid character. Phys Chem Chem Phys 2019; 21:21249-21261. [PMID: 31538165 DOI: 10.1039/c9cp04101j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ultrafast 2DIR spectra and pump-probe responses of the N2O ν3 asymmetric stretch in SF6 as a function of density from the gas to supercritical phase and liquid are reported. 2DIR spectra unequivocally reveal free rotor character at all densities studied in the gas and supercritical region. Analysis of the 2DIR spectra determines that J-scrambling or rotational relaxation in N2O is highly efficient, occurring in ∼1.5 to ∼2 collisions with SF6 at all non-liquid densities. In contrast, N2O ν3 vibrational energy relaxation requires ∼15 collisions, and complete vibrational equilibrium occurs on the ∼ns scale at all densities. An independent binary collision model is sufficient to describe these supercritical state point dynamics. The N2O ν3 in liquid SF6 2DIR spectrum shows no evidence of free rotor character or spectral diffusion. Using these 2DIR results, hindered rotor or liquid-like character is found in gas and all supercritical solutions for SF6 densities ≥ρ* = 0.3, and increases with SF6 density. 2DIR spectral analysis offers direct time domain evidence of critical slowing for SF6 solutions closest to the critical point density. Applications of 2DIR to other high density and supercritical solution dynamics and descriptions are discussed.
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Affiliation(s)
- Greg Ng Pack
- Department of Chemistry, Boston University, Boston, MA 02215, USA. and Photonics Center, Boston University, Boston, MA 02215, USA
| | - Matthew C Rotondaro
- Department of Chemistry, Boston University, Boston, MA 02215, USA. and Photonics Center, Boston University, Boston, MA 02215, USA
| | - Parth P Shah
- Department of Chemistry, Boston University, Boston, MA 02215, USA. and Photonics Center, Boston University, Boston, MA 02215, USA
| | - Aritra Mandal
- Department of Chemistry, University of Colorado, Boulder, CO 80309, USA
| | - Shyamsunder Erramilli
- Photonics Center, Boston University, Boston, MA 02215, USA and Department of Physics, Boston University, Boston, MA 02215, USA
| | - L D Ziegler
- Department of Chemistry, Boston University, Boston, MA 02215, USA. and Photonics Center, Boston University, Boston, MA 02215, USA
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2
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Kundu A, Verma PK, Ha JH, Cho M. Studying Water Hydrogen-Bonding Network near the Lipid Multibilayer with Multiple IR Probes. J Phys Chem A 2017; 121:1435-1441. [DOI: 10.1021/acs.jpca.6b12152] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Achintya Kundu
- Center
for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea
- Department
of Chemistry, Korea University, Seoul 02841, Republic of Korea
| | - Pramod Kumar Verma
- Center
for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea
- Department
of Chemistry, Korea University, Seoul 02841, Republic of Korea
| | - Jeong-Hyon Ha
- Space-Time
Resolved Molecular Imaging Research Team, Korea Basic Science Institute (KBSI), Seoul 136-075, Republic of Korea
| | - Minhaeng Cho
- Center
for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea
- Department
of Chemistry, Korea University, Seoul 02841, Republic of Korea
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3
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Shattuck J, Shah P, Erramilli S, Ziegler LD. Structure Making and Breaking Effects of Cations in Aqueous Solution: Nitrous Oxide Pump–Probe Measurements. J Phys Chem B 2016; 120:10569-10580. [DOI: 10.1021/acs.jpcb.6b07896] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Shattuck
- Department
of Chemistry and the Photonics Center, Boston University, 590 Commonwealth
Avenue, Boston, Massachusetts 02215, United States
| | - P. Shah
- Department
of Chemistry and the Photonics Center, Boston University, 590 Commonwealth
Avenue, Boston, Massachusetts 02215, United States
| | - S. Erramilli
- Department
of Physics and Department of Biomedical Engineering and the Photonics
Center, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - L. D. Ziegler
- Department
of Chemistry and the Photonics Center, Boston University, 590 Commonwealth
Avenue, Boston, Massachusetts 02215, United States
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4
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Czurlok D, Gleim J, Lindner J, Vöhringer P. Vibrational Energy Relaxation of Thiocyanate Ions in Liquid-to-Supercritical Light and Heavy Water. A Fermi's Golden Rule Analysis. J Phys Chem Lett 2014; 5:3373-3379. [PMID: 26278447 DOI: 10.1021/jz501710c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The vibrational relaxation dynamics following an ultrafast nitrile stretching (ν3) excitation of thiocyanate anions dissolved in light and heavy water have been studied over a wide temperature and density range corresponding to the aqueous liquid up to the supercritical phase. In both solvents, the relaxation of the ν3 = 1 state of the anion leads to a direct recovery of the vibrational ground state and involves the resonant transfer of the excess vibrational energy onto the solvent. In light water, the energy-accepting states are provided by the bending-librational combination band (νb + νL), while in heavy water, the relaxation is thermally assisted by virtual acceptor states derived from the stretching-librational/restricted translational hot band (νS - νL,T). The relaxation rate is found to strictly obey Fermi's Golden Rule when the density of resonant solvent states is estimated from the linear infrared spectra of the solute and the pure solvents.
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Affiliation(s)
- Denis Czurlok
- Lehrstuhl für Molekulare Physikalische Chemie, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
| | - Jeannine Gleim
- Lehrstuhl für Molekulare Physikalische Chemie, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
| | - Jörg Lindner
- Lehrstuhl für Molekulare Physikalische Chemie, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
| | - Peter Vöhringer
- Lehrstuhl für Molekulare Physikalische Chemie, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115 Bonn, Germany
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5
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Gruenbaum SM, Skinner JL. Vibrational spectroscopy of water in hydrated lipid multi-bilayers. III. Water clustering and vibrational energy transfer. J Chem Phys 2014; 139:175103. [PMID: 24206336 DOI: 10.1063/1.4827018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Water clustering and connectivity around lipid bilayers strongly influences the properties of membranes and is important for functions such as proton and ion transport. Vibrational anisotropic pump-probe spectroscopy is a powerful tool for understanding such clustering, as the measured anisotropy depends upon the time-scale and degree of intra- and intermolecular vibrational energy transfer. In this article, we use molecular dynamics simulations and theoretical vibrational spectroscopy to help interpret recent experimental measurements of the anisotropy of water in lipid multi-bilayers as a function of both lipid hydration level and isotopic substitution. Our calculations are in satisfactory agreement with the experiments of Piatkowski, Heij, and Bakker, and from our simulations we can directly probe water clustering and connectivity. We find that at low hydration levels, many water molecules are in fact isolated, although up to 70% of hydration water forms small water clusters or chains. At intermediate hydration levels, water forms a wide range of cluster sizes, while at higher hydration levels, the majority of water molecules are part of a large, percolating water cluster. Therefore, the size, number, and nature of water clusters are strongly dependent on lipid hydration level, and the measured anisotropy reflects this through its dependence on intermolecular energy transfer.
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Affiliation(s)
- S M Gruenbaum
- Theoretical Chemistry Institute and Department of Chemistry, 1101 University Ave., University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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6
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Arthur EJ, King JT, Kubarych KJ, Brooks CL. Heterogeneous preferential solvation of water and trifluoroethanol in homologous lysozymes. J Phys Chem B 2014; 118:8118-27. [PMID: 24823618 PMCID: PMC4216199 DOI: 10.1021/jp501132z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
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Cytoplasmic
osmolytes can significantly alter the thermodynamic
and kinetic properties of proteins relative to those under dilute
solution conditions. Spectroscopic experiments of lysozymes in cosolvents
indicate that such changes may arise from the heterogeneous, site-specific
hydrophobic interactions between protein surface residues and individual
solvent molecules. In pursuit of an accurate and predictive model
for explaining biomolecular interactions, we study the averaged structural
characteristics of mixed solvents with homologous lysozyme solutes
using all-atom molecular dynamics. By observing the time-averaged
densities of different aqueous solutions of trifluoroethanol, we deduce
trends in the heterogeneous solvent interactions over each protein’s
surface, and investigate how the homology of protein structure does
not necessarily translate to similarities in solvent structure and
composition—even when observing identical side chains.
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Affiliation(s)
- Evan J Arthur
- Department of Chemistry and ‡Biophysics Program, University of Michigan , 930 N. University Avenue , Ann Arbor, Michigan 48109-1055, USA
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7
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Shattuck JT, Schneck JR, Chieffo LR, Erramilli S, Ziegler LD. Dispersed Three-Pulse Infrared Photon Echoes of Nitrous Oxide in Water and Octanol. J Phys Chem B 2013; 117:15774-85. [DOI: 10.1021/jp4065533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- J. T. Shattuck
- Department
of Chemistry and the Photonics Center, Boston University, 590 Commonwealth
Avenue, Boston, Massachusetts 02215, United States
| | - J. R. Schneck
- Department
of Chemistry and the Photonics Center, Boston University, 590 Commonwealth
Avenue, Boston, Massachusetts 02215, United States
| | - L. R. Chieffo
- Department
of Chemistry and the Photonics Center, Boston University, 590 Commonwealth
Avenue, Boston, Massachusetts 02215, United States
| | - S. Erramilli
- Department
of Physics and Department of Biomedical Engineering and the Photonics
Center, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - L. D. Ziegler
- Department
of Chemistry and the Photonics Center, Boston University, 590 Commonwealth
Avenue, Boston, Massachusetts 02215, United States
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8
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Kel O, Tamimi A, Thielges MC, Fayer MD. Ultrafast Structural Dynamics Inside Planar Phospholipid Multibilayer Model Cell Membranes Measured with 2D IR Spectroscopy. J Am Chem Soc 2013; 135:11063-74. [DOI: 10.1021/ja403675x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Oksana Kel
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
| | - Amr Tamimi
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
| | - Megan C. Thielges
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
| | - Michael D. Fayer
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
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9
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King JT, Arthur EJ, Brooks CL, Kubarych KJ. Site-specific hydration dynamics of globular proteins and the role of constrained water in solvent exchange with amphiphilic cosolvents. J Phys Chem B 2012; 116:5604-11. [PMID: 22530969 DOI: 10.1021/jp300835k] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The thermodynamic driving forces for protein folding, association, and function are often determined by protein-water interactions. With a novel covalently bound labeling approach, we have used sensitive vibrational probes, site-selectively conjugated to two lysozyme variants-in conjunction with ultrafast two-dimensional infrared (2D-IR) spectroscopy-to investigate directly the protein-water interface. By probing alternatively a topologically flat, rigid domain and a flexible domain, we find direct experimental evidence for spatially heterogeneous hydration dynamics. The hydration environment around globular proteins can vary from exhibiting bulk-like hydration dynamics to dynamically constrained water, which results from stifled hydrogen bond switching dynamics near extended hydrophobic surfaces. Furthermore, we leverage preferential solvation exchange to demonstrate that the liberation of dynamically constrained water is a sufficient driving force for protein-surface association reactions. These results provide an intuitive picture of the dynamic aspects of hydrophobic hydration of proteins, illustrating an essential function of water in biological processes.
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Affiliation(s)
- John T King
- Department of Chemistry, University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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10
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King JT, Ross MR, Kubarych KJ. Water-Assisted Vibrational Relaxation of a Metal Carbonyl Complex Studied with Ultrafast 2D-IR. J Phys Chem B 2012; 116:3754-9. [DOI: 10.1021/jp2125747] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John T. King
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan
48109, United States
| | - Matthew R. Ross
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan
48109, United States
| | - Kevin J. Kubarych
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan
48109, United States
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11
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Watanabe K, Okajima H, Kato T, Hamaguchi HO. Rotational dynamics of solvated carbon dioxide studied by infrared, Raman, and time-resolved infrared spectroscopies and a molecular dynamics simulation. J Chem Phys 2012; 136:014508. [DOI: 10.1063/1.3671998] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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12
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Gruenbaum SM, Skinner JL. Vibrational spectroscopy of water in hydrated lipid multi-bilayers. I. Infrared spectra and ultrafast pump-probe observables. J Chem Phys 2011; 135:075101. [PMID: 21861584 PMCID: PMC3172989 DOI: 10.1063/1.3615717] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Accepted: 07/02/2011] [Indexed: 11/15/2022] Open
Abstract
The vibrational spectroscopy of hydration water in dilauroylphosphatidylcholine lipid multi-bilayers is investigated using molecular dynamics simulations and a mixed quantum/classical model for the OD stretch spectroscopy of dilute HDO in H(2)O. FTIR absorption spectra, and isotropic and anisotropic pump-probe decay curves have been measured experimentally as a function of the hydration level of the lipid multi-bilayer, and our goal is to make connection with these experiments. To this end, we use third-order response functions, which allow us to include non-Gaussian frequency fluctuations, non-Condon effects, molecular rotations, and a fluctuating vibrational lifetime, all of which we believe are important for this system. We calculate the response functions using existing transition frequency and dipole maps. From the experiments it appears that there are two distinct vibrational lifetimes corresponding to HDO molecules in different molecular environments. In order to obtain these lifetimes, we consider a simple two-population model for hydration water hydrogen bonds. Assuming a different lifetime for each population, we then calculate the isotropic pump-probe decay, fitting to experiment to obtain the two lifetimes for each hydration level. With these lifetimes in hand, we then calculate FTIR spectra and pump-probe anisotropy decay as a function of hydration. This approach, therefore, permits a consistent calculation of all observables within a unified computational scheme. Our theoretical results are all in qualitative agreement with experiment. The vibrational lifetime of lipid-associated OD groups is found to be systematically shorter than that of the water-associated population, and the lifetimes of each population increase with decreasing hydration, in agreement with previous analysis. Our theoretical FTIR absorption spectra successfully reproduce the experimentally observed red-shift with decreasing lipid hydration, and we confirm a previous interpretation that this shift results from the hydrogen bonding of water to the lipid phosphate group. From the pump-probe anisotropy decay, we confirm that the reorientational motions of water molecules slow significantly as hydration decreases, with water bound in the lipid carbonyl region undergoing the slowest rotations.
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Affiliation(s)
- S M Gruenbaum
- Theoretical Chemistry Institute and Department of Chemistry, 1101 University Ave. University of Wisconsin, Madison, Wisconsin 53706, USA
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13
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Olschewski M, Knop S, Lindner J, Vöhringer P. Vibrational relaxation of azide ions in liquid-to-supercritical water. J Chem Phys 2011; 134:214504. [DOI: 10.1063/1.3598108] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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14
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Pinnick ER, Erramilli S, Wang F. Computational investigation of lipid hydration water ofLα1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine at three hydration levels. Mol Phys 2010. [DOI: 10.1080/00268976.2010.503199] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Pinnick ER, Erramilli S, Wang F. The potential of mean force of nitrous oxide in a 1,2-dimyristoylphosphatidylcholine lipid bilayer. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.02.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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