1
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Adhikary R, Zimmermann J, Stanfield RL, Wilson IA, Yu W, Oda M, Romesberg FE. Structure and Dynamics of Stacking Interactions in an Antibody Binding Site. Biochemistry 2019; 58:2987-2995. [PMID: 31243995 DOI: 10.1021/acs.biochem.9b00119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
For years, antibodies (Abs) have been used as a paradigm for understanding how protein structure contributes to molecular recognition. However, with the ability to evolve Abs that recognize specific chromophores, they also have great potential as models for how protein dynamics contribute to molecular recognition. We previously raised murine Abs to different chromophores and, with the use of three-pulse photon echo peak shift spectroscopy, demonstrated that the immune system is capable of producing Abs with widely varying flexibility. We now report the characterization of the complexes formed between two Abs, 5D11 and 10A6, and the chromophoric ligand that they were evolved to recognize, 8-methoxypyrene-1,3,6-trisulfonic acid (MPTS). The sequences of the Ab genes indicate that they evolved from a common precursor. We also used a variety of spectroscopic methods to probe the photophysics and dynamics of the Ab-MPTS complexes and found that they are similar to each other but distinct from previously characterized anti-MPTS Abs. Structural studies revealed that this difference likely results from a unique mode of binding in which MPTS is sandwiched between the side chain of PheH98, which interacts with the chromophore via T-stacking, and the side chain of TrpL91, which interacts with the chromophore via parallel stacking. The T-stacking interaction appears to mediate relaxation on the picosecond time scale, while the parallel stacking appears to mediate relaxation on an ultrafast, femtosecond time scale, which dominates the response. The anti-MPTS Abs thus not only demonstrate the simultaneous use of the two limiting modes of stacking for molecular recognition, but also provide a unique opportunity to characterize how dynamics might contribute to molecular recognition. Both types of stacking are common in proteins and protein complexes where they may similarly contribute to dynamics and molecular recognition.
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Affiliation(s)
| | | | | | | | | | - Masayuki Oda
- Graduate School of Life and Environmental Sciences , Kyoto Prefectural University , 1-5, Hangi-cho , Shimogamo, Sakyo-ku, Kyoto 606-8522 , Japan
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2
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Goswami D. Spectrally resolved photon-echo spectroscopy of CdSe quantum dots at far from resonance excitation condition
$$^{\S }$$
§. J CHEM SCI 2018. [DOI: 10.1007/s12039-018-1554-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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3
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Bakulin AA, Morgan SE, Kehoe TB, Wilson MWB, Chin AW, Zigmantas D, Egorova D, Rao A. Real-time observation of multiexcitonic states in ultrafast singlet fission using coherent 2D electronic spectroscopy. Nat Chem 2015; 8:16-23. [DOI: 10.1038/nchem.2371] [Citation(s) in RCA: 268] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Accepted: 09/08/2015] [Indexed: 12/23/2022]
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4
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Ojha D, Chandra A. Ultrafast Vibrational Echo Spectroscopy of Liquid Water from First-Principles Simulations. J Phys Chem B 2015; 119:11215-28. [PMID: 26161933 DOI: 10.1021/acs.jpcb.5b03109] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Vibrational echo spectroscopy has become a powerful technique to study vibrational spectral diffusion in water and aqueous solutions. The dynamics of vibrational spectral diffusion is intimately related to the hydrogen bond fluctuations in liquid water and other hydrogen bonded liquids. Earlier theoretical calculations of vibrational echo spectroscopy of aqueous systems were based on classical molecular dynamics simulations involving empirical force fields of water. In the current work, we have employed the method of ab initio molecular dynamics simulation to calculate the spectral observables of vibrational echo and two-dimensional infrared (2D-IR) spectroscopy of liquid water at room temperature under Condon and cumulant approximations. The time scales extracted from the temporal decay of the frequency-time correlation function (FTCF), short-time slope of three pulse photon echo (SP3E), dynamic line width (DLW), and the slope of nodal line of 2D-IR spectra are found to be in reasonably close agreement with each other which reinforces the assertion that signatures of FTCF can be captured using three pulse photon echo and 2D-IR spectroscopy.
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Affiliation(s)
- Deepak Ojha
- Department of Chemistry, Indian Institute of Technology , Kanpur, India 208016
| | - Amalendu Chandra
- Department of Chemistry, Indian Institute of Technology , Kanpur, India 208016
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5
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Moca R, Meech SR, Heisler IA. Two-Dimensional Electronic Spectroscopy of Chlorophyll a: Solvent Dependent Spectral Evolution. J Phys Chem B 2015; 119:8623-30. [DOI: 10.1021/acs.jpcb.5b04339] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roberta Moca
- School of Chemistry, University of East Anglia, Norwich Research
Park, Norwich NR4 7TJ, U.K
| | - Stephen R. Meech
- School of Chemistry, University of East Anglia, Norwich Research
Park, Norwich NR4 7TJ, U.K
| | - Ismael A. Heisler
- School of Chemistry, University of East Anglia, Norwich Research
Park, Norwich NR4 7TJ, U.K
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6
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Adhikary R, Yu W, Oda M, Walker RC, Chen T, Stanfield RL, Wilson IA, Zimmermann J, Romesberg FE. Adaptive mutations alter antibody structure and dynamics during affinity maturation. Biochemistry 2015; 54:2085-93. [PMID: 25756188 PMCID: PMC5061043 DOI: 10.1021/bi501417q] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
While adaptive mutations can bestow new functions on proteins via the introduction or optimization of reactive centers, or other structural changes, a role for the optimization of protein dynamics also seems likely but has been more difficult to evaluate. Antibody (Ab) affinity maturation is an example of adaptive evolution wherein the adaptive mutations may be identified and Abs may be raised to specific targets that facilitate the characterization of protein dynamics. Here, we report the characterization of three affinity matured Abs that evolved from a common germline precursor to bind the chromophoric antigen (Ag), 8-methoxypyrene-1,3,6-trisulfonate (MPTS). In addition to characterizing the sequence, molecular recognition, and structure of each Ab, we characterized the dynamics of each complex by determining their mechanical response to an applied force via three-pulse photon echo peak shift (3PEPS) spectroscopy and deconvoluting the response into elastic, anelastic, and plastic components. We find that for one Ab, affinity maturation was accomplished via the introduction of a single functional group that mediates a direct contact with MPTS and results in a complex with little anelasticity or plasticity. In the other two cases, more mutations were introduced but none directly contact MPTS, and while their effects on structure are subtle, their effects on anelasticity and plasticity are significant, with the level of plasticity correlated with specificity, suggesting that the optimization of protein dynamics may have contributed to affinity maturation. A similar optimization of structure and dynamics may contribute to the evolution of other proteins.
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Affiliation(s)
- Ramkrishna Adhikary
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Wayne Yu
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Masayuki Oda
- Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, 1-5, Hangi-cho, Shimogamo, Sakyo-ku, Kyoto 606-8522, Japan
| | - Ross C. Walker
- Department of Chemistry and Biochemistry, San Diego Supercomputer Center, University of California San Diego, La Jolla, CA 92093, USA
| | - Tingjian Chen
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Robyn L. Stanfield
- Department of Integrative Structural and Computational Biology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Ian A. Wilson
- Department of Integrative Structural and Computational Biology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Jörg Zimmermann
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Floyd E. Romesberg
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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7
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Camargo FVA, Anderson HL, Meech SR, Heisler IA. Full Characterization of Vibrational Coherence in a Porphyrin Chromophore by Two-Dimensional Electronic Spectroscopy. J Phys Chem A 2014; 119:95-101. [DOI: 10.1021/jp511881a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Franco V. A. Camargo
- School
of Chemistry, Norwich Research Park, University of East Anglia, Norwich NR4 7TJ, U.K
- CAPES Foundation,
Ministry of Education of Brazil, Brasilia - DF 70040-202, Brazil
| | - Harry L. Anderson
- Department
of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, U.K
| | - Stephen R. Meech
- School
of Chemistry, Norwich Research Park, University of East Anglia, Norwich NR4 7TJ, U.K
| | - Ismael A. Heisler
- School
of Chemistry, Norwich Research Park, University of East Anglia, Norwich NR4 7TJ, U.K
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8
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Konar A, Lozovoy VV, Dantus M. Solvent Environment Revealed by Positively Chirped Pulses. J Phys Chem Lett 2014; 5:924-928. [PMID: 26274090 DOI: 10.1021/jz500291h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The spectroscopy of large organic molecules and biomolecules in solution has been investigated using various time-resolved and frequency-resolved techniques. Of particular interest is the early response of the molecule and the solvent, which is difficult to study due to the ambiguity in assigning and differentiating inter- and intramolecular contributions to the electronic and vibrational populations and coherence. Our measurements compare the yield of fluorescence and stimulated emission for two laser dyes IR144 and IR125 as a function of chirp. While negatively chirped pulses are insensitive to solvent viscosity, positively chirped pulses are found to be uniquely sensitive probes of solvent viscosity. The fluorescence maximum for IR125 is observed near transform-limited pulses; however, for IR144, it is observed for positively chirped pulses once the pulses have been stretched to hundreds of femtoseconds. We conclude that chirped pulse spectroscopy is a simple one-beam method that is sensitive to early solvation dynamics.
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Affiliation(s)
- Arkaprabha Konar
- †Department of Chemistry and ‡Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, United States
| | - Vadim V Lozovoy
- †Department of Chemistry and ‡Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, United States
| | - Marcos Dantus
- †Department of Chemistry and ‡Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, United States
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9
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Nagasawa Y, Miyasaka H. Ultrafast solvation dynamics and charge transfer reactions in room temperature ionic liquids. Phys Chem Chem Phys 2014; 16:13008-26. [DOI: 10.1039/c3cp55465a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this perspective, we review the recent studies concerning the liquid structure and solvation dynamics of ionic liquids, and their influence upon electron transfer and charge transfer reactions.
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Affiliation(s)
- Yutaka Nagasawa
- Division of Frontier Materials Science
- Department of Materials Engineering Science
- Graduate School of Engineering Science
- Osaka University
- Toyonaka, Japan
| | - Hiroshi Miyasaka
- Division of Frontier Materials Science
- Department of Materials Engineering Science
- Graduate School of Engineering Science
- Osaka University
- Toyonaka, Japan
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10
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Nibbering ET, Chudoba C, Elsaesser T. Hydrogen-Bond Dynamics and Solvation of Electronically Excited States as Determined by Femtosecond Vibrational Spectroscopy. Isr J Chem 2013. [DOI: 10.1002/ijch.199900040] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Cho M, Brixner T, Stiopkin I, Vaswani H, Fleming GR. Two Dimensional Electronic Spectroscopy of Molecular Complexes. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200600002] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Nagasawa Y, Ando Y, Okada T. Solvent Dependent Ultrafast Ground State Recovery Dynamics of Triphenylmethane Dyes. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200000095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Bakulin AA, Cringus D, Pieniazek PA, Skinner JL, Jansen TLC, Pshenichnikov MS. Dynamics of water confined in reversed micelles: multidimensional vibrational spectroscopy study. J Phys Chem B 2013; 117:15545-58. [PMID: 23980543 DOI: 10.1021/jp405853j] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Here we perform a comprehensive study of ultrafast molecular and vibrational dynamics of water confined in small reversed micelles (RMs). The molecular picture is elucidated with two-dimensional infrared (2D IR) spectroscopy of water OH stretch vibrations and molecular dynamics simulations, bridged by theoretical calculations of linear and 2D IR vibrational spectra. To investigate the effects of intermolecular coupling, experiments and modeling are performed for isotopically diluted (HDO in D2O) and undiluted (H2O) water. We put a separation of water inside RMs into two subensembles (water-bound and surfactant-bound molecules), observed by many before, on a solid theoretical basis. Water molecules fully attached to the lipid interface ("shell" water) are decoupled from one another and from the central water nanopool ("core" water). The environmental fluctuations are largely "frozen" for the shell water, while the core waters demonstrate much faster dynamics but still not as fast as in the bulk case. A substantial nanoconfinement effect on the dynamics of the core water is observed after disentanglement of the shell water contribution, which is fully confirmed by the simulations of 2D IR spectra. Current results provide new insights into interaction between biological objects like membranes or proteins with the surrounding aqueous bath, and highlight peculiarities in vibrational energy redistribution near the lipid surface.
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Affiliation(s)
- Artem A Bakulin
- Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
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14
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Ajdarzadeh A, Consani C, Bräm O, Tortschanoff A, Cannizzo A, Chergui M. Ultraviolet transient absorption, transient grating and photon echo studies of aqueous tryptophan. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.01.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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15
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Cho B, Tiwari V, Hill RJ, Peters WK, Courtney TL, Spencer AP, Jonas DM. Absolute Measurement of Femtosecond Pump–Probe Signal Strength. J Phys Chem A 2013; 117:6332-45. [DOI: 10.1021/jp4019662] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Byungmoon Cho
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215,
United States
| | - Vivek Tiwari
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215,
United States
| | - Robert J. Hill
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215,
United States
| | - William K. Peters
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215,
United States
| | - Trevor L. Courtney
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215,
United States
| | - Austin P. Spencer
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215,
United States
| | - David M. Jonas
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215,
United States
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16
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Sailer CF, Thallmair S, Fingerhut BP, Nolte C, Ammer J, Mayr H, Pugliesi I, de Vivie-Riedle R, Riedle E. A Comprehensive Microscopic Picture of the Benzhydryl Radical and Cation Photogeneration and Interconversion through Electron Transfer. Chemphyschem 2013; 14:1423-37. [DOI: 10.1002/cphc.201201057] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Indexed: 11/09/2022]
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17
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Zhang XX, Liang M, Ernsting NP, Maroncelli M. Complete Solvation Response of Coumarin 153 in Ionic Liquids. J Phys Chem B 2012; 117:4291-304. [DOI: 10.1021/jp305430a] [Citation(s) in RCA: 110] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xin-Xing Zhang
- Department of Physics, College
of Physical Science, Nankai University,
Tianjin, China
- Department
of Chemistry, Humboldt University, Berlin,
Germany
| | - Min Liang
- Department of Chemistry, The Pennsylvania State University, University Park,
Pennsylvania, United States
| | | | - Mark Maroncelli
- Department of Chemistry, The Pennsylvania State University, University Park,
Pennsylvania, United States
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18
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Adhikary R, Yu W, Oda M, Zimmermann J, Romesberg FE. Protein dynamics and the diversity of an antibody response. J Biol Chem 2012; 287:27139-47. [PMID: 22685303 PMCID: PMC3411056 DOI: 10.1074/jbc.m112.372698] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 05/25/2012] [Indexed: 01/08/2023] Open
Abstract
The immune system is remarkable in its ability to produce antibodies (Abs) with virtually any specificity from a limited repertoire of germ line precursors. Although the contribution of sequence diversity to this molecular recognition has been studied for decades, recent models suggest that protein dynamics may also broaden the range of targets recognized. To characterize the contribution of protein dynamics to immunological molecular recognition, we report the sequence, thermodynamic, and time-resolved spectroscopic characterization of a panel of eight Abs elicited to the chromophoric antigen 8-methoxypyrene-1,3,6-trisulfonate (MPTS). Based on the sequence data, three of the Abs arose from unique germ line Abs, whereas the remaining five comprise two sets of siblings that arose by somatic mutation of a common precursor. The thermodynamic data indicate that the Abs recognize MPTS via a variety of mechanisms. Although the spectroscopic data reveal small differences in protein dynamics, the anti-MPTS Abs generally show similar levels of flexibility and conformational heterogeneity, possibly representing the convergent evolution of the dynamics necessary for function. However, one Ab is significantly more rigid and conformationally homogeneous than the others, including a sibling Ab from which it differs by only five somatic mutations. This example of divergent evolution demonstrates that point mutations are capable of fixing significant differences in protein dynamics. The results provide unique insight into how high affinity Abs may be produced that bind virtually any target and possibly, from a more general perspective, how new protein functions are evolved.
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Affiliation(s)
- Ramkrishna Adhikary
- From the Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037 and
| | - Wayne Yu
- From the Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037 and
| | - Masayuki Oda
- the Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto 606-8522, Japan
| | - Jörg Zimmermann
- From the Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037 and
| | - Floyd E. Romesberg
- From the Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037 and
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19
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Fingerhut BP, Sailer CF, Ammer J, Riedle E, de Vivie-Riedle R. Buildup and Decay of the Optical Absorption in the Ultrafast Photo-Generation and Reaction of Benzhydryl Cations in Solution. J Phys Chem A 2012; 116:11064-74. [DOI: 10.1021/jp300986t] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Benjamin P. Fingerhut
- Department Chemie, Ludwig-Maximilians-Universität (LMU), Butenandt-Strasse 11, 81377 München, Germany
| | - Christian F. Sailer
- Lehrstuhl für BioMolekulare
Optik, Ludwig-Maximilians-Universität (LMU), Oettingenstrasse 67, 80538 München, Germany
| | - Johannes Ammer
- Department Chemie, Ludwig-Maximilians-Universität (LMU), Butenandt-Strasse 11, 81377 München, Germany
| | - Eberhard Riedle
- Lehrstuhl für BioMolekulare
Optik, Ludwig-Maximilians-Universität (LMU), Oettingenstrasse 67, 80538 München, Germany
| | - Regina de Vivie-Riedle
- Department Chemie, Ludwig-Maximilians-Universität (LMU), Butenandt-Strasse 11, 81377 München, Germany
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20
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Philip Kraack J, Motzkus M, Buckup T. Selective nonlinear response preparation using femtosecond spectrally resolved four-wave-mixing. J Chem Phys 2011; 135:224505. [DOI: 10.1063/1.3666846] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Colby KA, Bardeen CJ. Electronic Energy Migration in Solid versus Liquid Host Matrices for Concentrated Perylenediimide Dye Solutions. J Phys Chem A 2011; 115:7574-81. [DOI: 10.1021/jp202654v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kathryn A. Colby
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
| | - Christopher J. Bardeen
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
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22
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Kang K. Image time-correlation, dynamic light scattering, and birefringence for the study of the response of anisometric colloids to external fields. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:053903. [PMID: 21639514 DOI: 10.1063/1.3589856] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this paper, a detailed description of equipment is given, specially designed to characterize the response of non-spherical colloids to external fields. To characterize slow structural changes on a large length scale we developed an image correlation method, fast dynamics on the colloidal-particle level is probed by means of a vertically mounted, small angle dynamic light scattering setup, while the orientational order (induced by the external field) is measured with a birefringence setup with off-normal incidence. The performance of this in situ set of instruments is illustrated by experiments on concentrated dispersions of very long and thin, charged colloidal rods (fd-virus particles) in external electric fields. Here, the frequency of the field is sufficiently low to polarize electrical double layers, leading to additional inter-colloidal interactions which are found to give rise to phase/state transitions and dynamical states (K. Kang and J. K. G. Dhont, Soft Matter 6, 273, 2010).
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Affiliation(s)
- Kyongok Kang
- Forschungszentrum Jülich, ICS-3, Soft Condensed Matter, D-52425 Jülich, Germany
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23
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Muramatsu M, Nagasawa Y, Miyasaka H. Ultrafast Solvation Dynamics in Room Temperature Ionic Liquids Observed by Three-Pulse Photon Echo Peak Shift Measurements. J Phys Chem A 2011; 115:3886-94. [DOI: 10.1021/jp108282v] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Masayasu Muramatsu
- Division of Frontier Materials Science, Graduate School of Engineering Science, Center for Quantum Science and Technology under Extreme Conditions, Osaka University and CREST, JST, Toyonaka, Osaka 560-8531, Japan
| | - Yutaka Nagasawa
- Division of Frontier Materials Science, Graduate School of Engineering Science, Center for Quantum Science and Technology under Extreme Conditions, Osaka University and CREST, JST, Toyonaka, Osaka 560-8531, Japan
| | - Hiroshi Miyasaka
- Division of Frontier Materials Science, Graduate School of Engineering Science, Center for Quantum Science and Technology under Extreme Conditions, Osaka University and CREST, JST, Toyonaka, Osaka 560-8531, Japan
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24
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Donehue JE, Varnavski OP, Cemborski R, Iyoda M, Goodson T. Probing Coherence in Synthetic Cyclic Light-Harvesting Pigments. J Am Chem Soc 2011; 133:4819-28. [DOI: 10.1021/ja108359w] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jessica E. Donehue
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Oleg P. Varnavski
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Robert Cemborski
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Masahiko Iyoda
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Theodore Goodson
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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25
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Nagasawa Y. Ultrafast photon echo experiments in condensed phase: Detection of solvation dynamics, coherent wavepacket motions and static inhomogeneity. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2011. [DOI: 10.1016/j.jphotochemrev.2011.05.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Dynamics of quantum wave packets in complex molecules traced by 2D coherent electronic correlation spectroscopy. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.proche.2011.08.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Wong CY, Scholes GD. Biexcitonic Fine Structure of CdSe Nanocrystals Probed by Polarization-Dependent Two-Dimensional Photon Echo Spectroscopy. J Phys Chem A 2010; 115:3797-806. [DOI: 10.1021/jp1079197] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Cathy Y. Wong
- Department of Chemistry, 80 St. George Street, Institute for Optical Sciences, and Centre for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario, M5S 3H6 Canada
| | - Gregory D. Scholes
- Department of Chemistry, 80 St. George Street, Institute for Optical Sciences, and Centre for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario, M5S 3H6 Canada
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30
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Oh MHJ, Salvador MR, Wong CY, Scholes GD. Three-Pulse Photon-Echo Peak Shift Spectroscopy and Its Application for the Study of Solvation and Nanoscale Excitons. Chemphyschem 2010; 12:88-100. [DOI: 10.1002/cphc.201000712] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Indexed: 11/10/2022]
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31
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Oskouei AA, Tortschanoff A, Bräm O, van Mourik F, Cannizzo A, Chergui M. Three pulse UV photon echo studies of molecules in solution: Effect of the chirp. J Chem Phys 2010; 133:064506. [DOI: 10.1063/1.3463448] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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32
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Zimmermann J, Romesberg FE, Brooks CL, Thorpe IF. Molecular description of flexibility in an antibody combining site. J Phys Chem B 2010; 114:7359-70. [PMID: 20455589 PMCID: PMC2892760 DOI: 10.1021/jp906421v] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Mature antibodies (Abs) that are exquisitely specific for virtually any foreign molecule may be produced by affinity maturation of naïve (or germline) Abs. However, the finite number of germline Abs available suggests that, in contrast to mature Abs, germline Abs must be broadly polyspecific so that they are able to recognize a wide range of ligands. Thus, affinity maturation must play a role in mediating Ab specificity. One biophysical property that distinguishes polyspecificity from specificity is protein flexibility; a flexible combining site is able to adopt different conformations that recognize different foreign molecules (or antigens), while a rigid combining site is locked into a conformation that is specific for a given antigen. Recent studies (Proc. Natl. Acad. Sci. U.S.A. 2007, 104, 8821-8826) have examined, at the atomic level, the structural properties that mediate changes in flexibility at four stages of affinity maturation in the 4-4-20 Ab. These studies employed molecular dynamics simulations to reveal a network of residue interactions that mediate the flexibility changes accompanying maturation. The flexibility of the Ab combining sites in these molecular systems was originally measured using three-pulse photon echo spectroscopy (3PEPS). The present investigation extends this work by providing a concrete link between structural properties of the Ab molecules and features of the spectroscopic measurements used to characterize their flexibility. Results obtained from the simulations are in good qualitative agreement with the experimental measurements and indicate that the spectroscopic signal is sensitive to protein dynamics distributed throughout the entire combining site. Thus, the simulations provide a molecular-level interpretation of the changes induced by affinity maturation of the Ab. The results suggest that 3PEPS spectroscopy in combination with molecular dynamics simulations can provide a detailed description of protein dynamics and, in this case, how it is evolved for biological function.
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Affiliation(s)
- Jörg Zimmermann
- Corresponding author. , Phone : (858) 784-7335, Fax : (858) 784-7472. , Phone: (410) 455-5728, Fax: (410) 455-2608
| | | | | | - Ian F. Thorpe
- Corresponding author. , Phone : (858) 784-7335, Fax : (858) 784-7472. , Phone: (410) 455-5728, Fax: (410) 455-2608
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33
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Mančal T, Nemeth A, Milota F, Lukeš V, Kauffmann HF, Sperling J. Vibrational wave packet induced oscillations in two-dimensional electronic spectra. II. Theory. J Chem Phys 2010. [DOI: 10.1063/1.3404405] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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34
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Nemeth A, Milota F, Mančal T, Lukeš V, Hauer J, Kauffmann HF, Sperling J. Vibrational wave packet induced oscillations in two-dimensional electronic spectra. I. Experiments. J Chem Phys 2010. [DOI: 10.1063/1.3404404] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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35
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Nagasawa Y, Mukai R, Mori K, Muramatsu M, Miyasaka H. Effect of ultrafast electron transfer on photon echo signal: Decoherence process in electron-donating solvents. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.10.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Diffractive optics based three-pulse photon echo peak shift studies of spectral diffusion in polar liquids: Evidence for long lived frequency correlations. J Chem Phys 2009; 131:164508. [DOI: 10.1063/1.3253971] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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37
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Milota F, Sperling J, Nemeth A, Mančal T, Kauffmann HF. Two-dimensional electronic spectroscopy of molecular excitons. Acc Chem Res 2009; 42:1364-74. [PMID: 19673525 DOI: 10.1021/ar800282e] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Understanding of the nuclear and electronic structure and dynamics of molecular systems has advanced considerably through probing the nonlinear response of molecules to sequences of pulsed electromagnetic fields. The ability to control various degrees of freedom of the excitation pulses-such as duration, sequence, frequency, polarization, and shape-has led to a variety of time-resolved spectroscopic methods. The various techniques that researchers use are commonly classified by their dimensionality, which refers to the number of independently variable time delays between the pulsed fields that induce the signal. Though pico- and femtosecond time-resolved spectroscopies of electronic transitions have come of age, only recently have researchers been able to perform two-dimensional electronic spectroscopy (2D-ES) in the visible frequency regime and correlate transition frequencies that evolve in different time intervals. The two-dimensional correlation plots and their temporal evolution allow one to access spectral information that is not exposed directly in other one-dimensional nonlinear methods. In this Account, we summarize our studies of a series of increasingly complex molecular chromophores. We examine noninteracting dye molecules, a monomer-dimer equilibrium of a prototypical dye molecule, and finally a supramolecular assembly of electronically coupled absorbers. By tracing vibronic signal modulations, differentiating line-broadening mechanisms, analyzing distinctly different relaxation dynamics, determining electronic coupling strengths, and directly following excitation energy transfer pathways, we illustrate how two-dimensional electronic spectroscopy can image physical phenomena that underlie the optical response of a particular system. Although 2D-ES is far from being a "turn-key" method, we expect that experimental progress and potential commercialization of instrumentation will make 2D-ES accessible to a much broader scientific audience, analogous to the development of multidimensional NMR and 2D-IR.
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Affiliation(s)
- Franz Milota
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Jaroslaw Sperling
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Alexandra Nemeth
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Tomáš Mančal
- Faculty of Mathematics and Physics, Charles University in Prague, 121 16 Prague 2, Czech Republic
| | - Harald F. Kauffmann
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
- Ultrafast Dynamics Group, Technical University of Vienna, 1040 Vienna, Austria
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38
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Jansen TLC, Cringus D, Pshenichnikov MS. Dissimilar dynamics of coupled water vibrations. J Phys Chem A 2009; 113:6260-5. [PMID: 19438222 DOI: 10.1021/jp900480r] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Dissimilar dynamics of coupled stretch vibrations of a water molecule are revealed by two-dimensional IR correlation spectroscopy. These are caused by essentially non-Gaussian fluctuations of the electric field exerted by the environment on the individual OH stretch vibrations. Non-Gaussian statistics of the individual site frequency fluctuations results in distinctively different dephasing of the symmetric and asymmetric eigenmodes. This phenomenon can only be described if the assumption of Gaussian dynamics in the traditional theories is abandoned.
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Affiliation(s)
- Thomas L C Jansen
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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39
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Abstract
Recent advances in ultrafast laser technology have spurred investigations of microheterogeneous solutions. In particular, researchers have explored details of reverse micelles (RMs), which present isolated droplets of polar solvent sequestered from a continuous nonpolar phase by a surfactant layer. This review explores recent studies utilizing a variety of ultrafast laser techniques to uncover details about structure and dynamics in various RMs. Using ultrafast vibrational spectroscopy, researchers have probed hydrogen-bond dynamics and vibrational energy relaxation in RMs. These studies have developed our understanding of reverse micellar structure, identifying varying water environments in the RMs. In a plethora of experiments employing probe molecules, researchers have explored the confined environment presented by RMs and their impact on a range of chemical reactions. These studies have shown that confinement, rather than the specific interactions with surfactants, is an important factor determining the impact of the reverse micellar environment on the chemistry.
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Affiliation(s)
- Nancy E Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.
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40
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Toutounji M. Empirical relaxation function and spectral density for underdamped vibrations at low temperatures. J Chem Phys 2009; 130:094501. [DOI: 10.1063/1.3085066] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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41
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Kwon JS, Choi CM, Kim HJ, Kim NJ, Jang J, Yang M. Combined Theoretical Modeling of Photoexcitation Spectrum of an Isolated Protonated Tyrosine. J Phys Chem A 2009; 113:2715-23. [DOI: 10.1021/jp809573a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jang Sook Kwon
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Chang Min Choi
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Hwan Jin Kim
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Nam Joon Kim
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Joonkyung Jang
- Department of Nanomaterials Engineering, Pusan National University, Miryang 627-706, South Korea
| | - Mino Yang
- Department of Chemistry and Basic Sciences Research Institute, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
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42
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Christensson N, Dietzek B, Yartsev A, Pullerits T. Solute specific polar solvation studied by photon echo spectroscopy. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2008.10.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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43
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Christensson N, Dietzek B, Yartsev A, Pullerits T. Probing the strength of the system-bath interaction by three-pulse photon echoes. J Chem Phys 2009; 130:024510. [DOI: 10.1063/1.2990652] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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44
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Gibson EA, Shen Z, Jimenez R. Three-pulse photon echo peak shift spectroscopy as a probe of flexibility and conformational heterogeneity in protein folding. Chem Phys Lett 2009; 473:330-335. [PMID: 21103002 PMCID: PMC2983487 DOI: 10.1016/j.cplett.2009.04.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We investigate the equilibrium unfolding of Zn-cytochrome c in guanidine hydrochloride by three-pulse photon echo peak shift (3PEPS) spectroscopy. Unexpectedly, the measurements reveal that inhomogeneous broadening of the sample at the midpoint of the denaturation is larger than that of either native or unfolded states. To interpret this finding, we present simulations of the peak shift for both two-state and three-state unfolding models. Both the denaturant concentration dependence of the asymptotic peak shift (APS) and the wavelength dependence of the APS at the midpoint of the denaturation are different for the two models. Our data are consistent with two-state unfolding.
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Affiliation(s)
- Emily A. Gibson
- Department of Physics, University of Colorado Denver, Denver, CO 80217, USA
| | - Zhaochuan Shen
- JILA, National Institute of Standards and Technology and University of Colorado, Boulder, CO 80309, USA
- Department of Physics, University of Colorado at Boulder, Boulder, CO 80309, USA
| | - Ralph Jimenez
- JILA, National Institute of Standards and Technology and University of Colorado, Boulder, CO 80309, USA
- Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, CO 80309, USA
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45
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Yang M. Effect of finite pulse duration in three pulse photon echo experiments: Numerical comparison of 3PEPS and S3PE. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2008.11.051] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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46
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Milota F, Sperling J, Nemeth A, Abramavicius D, Mukamel S, Kauffmann HF. Excitonic couplings and interband energy transfer in a double-wall molecular aggregate imaged by coherent two-dimensional electronic spectroscopy. J Chem Phys 2009; 131:054510. [DOI: 10.1063/1.3197852] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Thielges MC, Zimmermann J, Yu W, Oda M, Romesberg FE. Exploring the energy landscape of antibody-antigen complexes: protein dynamics, flexibility, and molecular recognition. Biochemistry 2008; 47:7237-47. [PMID: 18549243 DOI: 10.1021/bi800374q] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The production of antibodies that selectively bind virtually any foreign compound is the hallmark of the immune system. While much is understood about how sequence diversity contributes to this remarkable feat of molecular recognition, little is known about how sequence diversity impacts antibody dynamics, which is also expected to contribute to molecular recognition. Toward this goal, we examined a panel of antibodies elicited to the chromophoric antigen fluorescein. On the basis of isothermal titration calorimetry, we selected six antibodies that bind fluorescein with diverse binding entropies, suggestive of varying contributions of dynamics to molecular recognition. Sequencing revealed that two pairs of antibodies employ homologous heavy chains that were derived from common germline genes, while the other two heavy chains and all six of the light chains were derived from different germline genes and are not homologous. Interestingly, more than half of all the somatic mutations acquired during affinity maturation among the six antibodies are located in positions unlikely to contact fluorescein directly. To quantify and compare the dynamics of the antibody-fluorescein complexes, three-pulse photon echo peak shift and transient grating spectroscopy were employed. All of the antibodies exhibited motions on three distinct time scales, ultrafast motions on the <100 fs time scale, diffusive motions on the picosecond time scale, and motions that occur on time scales longer than nanoseconds and thus appear static. However, the exact frequency of the picosecond time scale motion and the relative contribution of the different motions vary significantly among the antibody-chromophore complexes, revealing a high level of dynamic diversity. Using a hierarchical model, we relate the data to features of the antibodies' energy landscapes as well as their flexibility in terms of elasticity and plasticity. In all, the data provide a consistent picture of antibody flexibility, which interestingly appears to be correlated with binding entropy as well as with germline gene use and the mutations introduced during affinity maturation. The data also provide a gauge of the dynamic diversity of the antibody repertoire and suggest that this diversity might contribute to molecular recognition by facilitating the recognition of the broadest range of foreign molecules.
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Affiliation(s)
- Megan C Thielges
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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48
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49
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Oskouei AA, Bräm O, Cannizzo A, van Mourik F, Tortschanoff A, Chergui M. Ultrafast UV photon echo peak shift and fluorescence up conversion studies of non-polar solvation dynamics. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.01.029] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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50
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Sperling J, Nemeth A, Baum P, Šanda F, Riedle E, Kauffmann H, Mukamel S, Milota F. Exciton dynamics in a disordered conjugated polymer: Three-pulse photon-echo and transient grating experiments. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.02.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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