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Raman Spectroscopic, Computational, and X-ray crystallographic investigation of Intermolecular Interactions in Trimethylamine N-oxide (TMAO) and TMAO-d9. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Zetterholm SG, Verville GA, Boutwell L, Boland C, Prather JC, Bethea J, Cauley J, Warren KE, Smith SA, Magers DH, Hammer NI. Noncovalent Interactions between Trimethylamine N-Oxide (TMAO), Urea, and Water. J Phys Chem B 2018; 122:8805-8811. [PMID: 30165021 DOI: 10.1021/acs.jpcb.8b04388] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Trimethylamine N-oxide (TMAO) and urea are two important osmolytes with their main significance to the biophysical field being in how they uniquely interact with proteins. Urea is a strong protein destabilizing agent, whereas TMAO is known to counteract urea's deleterious effects. The exact mechanisms by which TMAO stabilizes and urea destabilizes folded proteins continue to be debated in the literature. Although recent evidence has suggested that urea binds directly to amino acid side chains to make protein folding less thermodynamically favored, it has also been suggested that urea acts indirectly to denature proteins by destabilizing the surrounding hydrogen bonding water networks. Here, we elucidate the molecular level mechanism of TMAO's unique ability to counteract urea's destabilizing nature by comparing Raman spectroscopic frequency shifts to the results of electronic structure calculations of microsolvated molecular clusters. Experimental and computational data suggest that the addition of TMAO into an aqueous solution of urea induces blue shifts in urea's H-N-H symmetric bending modes, which is evidence for direct interactions between the two cosolvents.
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Affiliation(s)
- Sarah G Zetterholm
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Genevieve A Verville
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
| | - Leeann Boutwell
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Christopher Boland
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
| | - John C Prather
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
| | - Jonathan Bethea
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Jordan Cauley
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States.,Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Kayla E Warren
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
| | - Shelley A Smith
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - David H Magers
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Nathan I Hammer
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
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Ellington TL, Reves PL, Simms BL, Wilson JL, Watkins DL, Tschumper GS, Hammer NI. Quantifying the Effects of Halogen Bonding by Haloaromatic Donors on the Acceptor Pyrimidine. Chemphyschem 2017; 18:1267-1273. [PMID: 28247539 DOI: 10.1002/cphc.201700114] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Indexed: 01/16/2023]
Abstract
The effects of intermolecular interactions by a series of haloaromatic halogen bond donors on the normal modes and chemical shifts of the acceptor pyrimidine are investigated by Raman and NMR spectroscopies and electronic structure computations. Halogen-bond interactions with pyrimidine's nitrogen atoms shift normal modes to higher energy and upfield shift 1 H and 13 C NMR peaks in adjacent nuclei. This perturbation of vibrational normal modes is reminiscent of the effects of hydrogen bonded networks of water, methanol, or silver on pyrimidine. The unexpected observation of vibrational red shifts and downfield 13 C NMR shifts in some complexes suggests that other intermolecular forces such as π interactions are competing with halogen bonding. Natural bond orbital analyses indicate a wide range of charge transfer is possible from pyrimidine to different haloaromatic donors and computed halogen bond binding energies can be larger than a typical hydrogen bond. These results emphasize the importance in strategic selection of substituents and electron withdrawing groups in developing supramolecular structures based on halogen bonding.
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Affiliation(s)
- Thomas L Ellington
- Department of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, MS, 38677, USA
| | - Peyton L Reves
- Department of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, MS, 38677, USA
| | - Briana L Simms
- Department of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, MS, 38677, USA
| | - Jamey L Wilson
- Department of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, MS, 38677, USA
| | - Davita L Watkins
- Department of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, MS, 38677, USA
| | - Gregory S Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, MS, 38677, USA
| | - Nathan I Hammer
- Department of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, MS, 38677, USA
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Comez L, Paolantoni M, Corezzi S, Lupi L, Sassi P, Morresi A, Fioretto D. Aqueous solvation of amphiphilic molecules by extended depolarized light scattering: the case of trimethylamine-N-oxide. Phys Chem Chem Phys 2016; 18:8881-9. [PMID: 26958663 DOI: 10.1039/c5cp04357c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrophilic and hydrophobic interactions strongly affect the solvation dynamics of biomolecules. To understand their role, small model systems are generally employed to simplify the investigations. In this study the amphiphile trimethylamine N-oxide (TMAO) is chosen as an exemplar, and studied by means of extended frequency range depolarized light scattering (EDLS) experiments as a function of solute concentration. This technique proves to be a suitable tool for investigating different aspects of aqueous solvation, being able at the same time to provide information about relaxation processes and vibrational modes of solvent and solute. In the case study of TMAO, we find that the relaxation dynamics of hydration water is moderately retarded compared to the bulk, and the perturbation induced by the solute on surrounding water is confined to the first hydration shell. The results highlight the hydrophobic character of TMAO in its interaction with water. The number of molecules taking part in the solvation process decreases as the solute concentration increases, following a trend consistent with the hydration water-sharing model, and suggesting that aggregation between solute molecules is negligible. Finally, the analysis of the resonant modes in the THz region and the comparison with the corresponding results obtained for the isosteric molecule tert-butyl alcohol (TBA) allow us to provide new insights into the different solvating properties of these two biologically relevant molecules.
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Affiliation(s)
- L Comez
- IOM-CNR c/o Dipartimento di Fisica e Geologia, Università di Perugia, Via Pascoli, I-06123 Perugia, Italy. and Dipartimento di Fisica e Geologia, Università di Perugia, Via Pascoli, I-06123 Perugia, Italy
| | - M Paolantoni
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy
| | - S Corezzi
- Dipartimento di Fisica e Geologia, Università di Perugia, Via Pascoli, I-06123 Perugia, Italy
| | - L Lupi
- Department of Chemistry, The University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, USA
| | - P Sassi
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy
| | - A Morresi
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy
| | - D Fioretto
- Dipartimento di Fisica e Geologia, Università di Perugia, Via Pascoli, I-06123 Perugia, Italy and Centro di Eccellenza sui Materiali Innovativi Nanostrutturati (CEMIN), Università di Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy
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Sasaki Y, Horikawa Y, Tokushima T, Okada K, Oura M, Aida M. Hydration structure of trimethylamine N-oxide in aqueous solutions revealed by soft X-ray emission spectroscopy and chemometric analysis. Phys Chem Chem Phys 2016; 18:27648-27653. [DOI: 10.1039/c6cp03750j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Soft X-ray emission spectroscopy coupled with a quantitative spectral analysis offers a useful technique for probing the solvation structure around the solute which interacts strongly with the solvent.
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Affiliation(s)
- Yuu Sasaki
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Japan
| | - Yuka Horikawa
- RIKEN SPring-8 Center
- Sayo
- Japan
- Department of Physics and Information Science
- Faculty of Science
| | | | - Kazumasa Okada
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Japan
| | | | - Misako Aida
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Japan
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Monhemi H, Housaindokht MR, Nakhaei Pour A. Effects of Natural Osmolytes on the Protein Structure in Supercritical CO2: Molecular Level Evidence. J Phys Chem B 2015. [DOI: 10.1021/acs.jpcb.5b03970] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hassan Monhemi
- Research
and Technology Center
of Biomolecules, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohammad Reza Housaindokht
- Research
and Technology Center
of Biomolecules, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Ali Nakhaei Pour
- Research
and Technology Center
of Biomolecules, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
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Hatori K, Iwasaki T, Wada R. Effect of urea and trimethylamine N-oxide on the binding between actin molecules. Biophys Chem 2014; 193-194:20-6. [DOI: 10.1016/j.bpc.2014.07.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 07/14/2014] [Accepted: 07/14/2014] [Indexed: 01/20/2023]
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Gu Q, Trindle CO, Knee JL. Electronic and Cationic Spectroscopy of 9-Hydroxy-9-fluorene Carboxylic Acid. J Phys Chem A 2014; 118:4982-7. [DOI: 10.1021/jp5045578] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Quanli Gu
- R. J. Reynolds
Tobacco Company, Winston Salem, North Carolina 27105, United States
| | - Carl O. Trindle
- Chemistry
Department, University of Virginia, Charlottesville, Virginia 22903, United States
| | - J. L. Knee
- Chemistry
Department, Wesleyan University, Middletown, Connecticut 06459, United States
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