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Spencer RJ, Zhanserkeev AA, Yang EL, Steele RP. The Near-Sightedness of Many-Body Interactions in Anharmonic Vibrational Couplings. J Am Chem Soc 2024; 146:15376-15392. [PMID: 38771156 DOI: 10.1021/jacs.4c03198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
Couplings between vibrational motions are driven by electronic interactions, and these couplings carry special significance in vibrational energy transfer, multidimensional spectroscopy experiments, and simulations of vibrational spectra. In this investigation, the many-body contributions to these couplings are analyzed computationally in the context of clathrate-like alkali metal cation hydrates, including Cs+(H2O)20, Rb+(H2O)20, and K+(H2O)20, using both analytic and quantum-chemistry potential energy surfaces. Although the harmonic spectra and one-dimensional anharmonic spectra depend strongly on these many-body interactions, the mode-pair couplings were, perhaps surprisingly, found to be dominated by one-body effects, even in cases of couplings to low-frequency modes that involved the motion of multiple water molecules. The origin of this effect was traced mainly to geometric distortion within water monomers and cancellation of many-body effects in differential couplings, and the effect was also shown to be agnostic to the identity of the ion. These outcomes provide new understanding of vibrational couplings and suggest the possibility of improved computational methods for the simulation of infrared and Raman spectra.
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Affiliation(s)
- Ryan J Spencer
- Department of Chemistry and Henry Eyring Center for Theoretical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Asylbek A Zhanserkeev
- Department of Chemistry and Henry Eyring Center for Theoretical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Emily L Yang
- Department of Chemistry and Henry Eyring Center for Theoretical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Ryan P Steele
- Department of Chemistry and Henry Eyring Center for Theoretical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
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Safferthal M, Greis K, Chang R, Kirschbaum C, Hoffmann W, Meijer G, von Helden G, Pagel K. Cryogenic infrared spectroscopy reveals remarkably short NH +⋯F hydrogen bonds in fluorinated phenylalanines. Phys Chem Chem Phys 2023; 25:24783-24788. [PMID: 37671576 DOI: 10.1039/d3cp03776b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
In past decades, hydrogen bonds involving organic fluorine have been a highly disputed topic. Obtaining clear evidence for the presence of fluorine-specific interactions is generally difficult because of their weak nature. Today, the existence of hydrogen bonds with organic fluorine is widely accepted and supported by numerous studies. However, strong bonds with short H⋯F distances remain scarce and are primarily found in designed model compounds. Using a combination of cryogenic gas-phase infrared spectroscopy and density functional theory, we here analyze a series of conformationally unrestrained fluorinated phenylalanine compounds as protonated species. The results suggest proximal NH+⋯F hydrogen bonds with an exceptionally close H⋯F distance (1.79 Å) in protonated ortho-fluorophenylalanine.
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Affiliation(s)
- Marc Safferthal
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Altensteinstraße 23a, 14195 Berlin, Germany.
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Kim Greis
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Altensteinstraße 23a, 14195 Berlin, Germany.
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Rayoon Chang
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Altensteinstraße 23a, 14195 Berlin, Germany.
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Carla Kirschbaum
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Altensteinstraße 23a, 14195 Berlin, Germany.
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Waldemar Hoffmann
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Altensteinstraße 23a, 14195 Berlin, Germany.
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Gerard Meijer
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Gert von Helden
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Kevin Pagel
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, Altensteinstraße 23a, 14195 Berlin, Germany.
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
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Johnson Esua O, Sun DW, Cheng JH, Wang H, Lv M. Functional and bioactive properties of Larimichthys polyactis protein hydrolysates as influenced by plasma functionalized water-ultrasound hybrid treatments and enzyme types. ULTRASONICS SONOCHEMISTRY 2022; 86:106023. [PMID: 35561594 PMCID: PMC9112016 DOI: 10.1016/j.ultsonch.2022.106023] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 04/26/2022] [Accepted: 04/30/2022] [Indexed: 05/04/2023]
Abstract
The effects of plasma functionalized water (PFW) and its combination with ultrasound (UPFW) on the functional and bioactive properties of small yellow croaker protein hydrolysates (SYPHs) produced from three enzymes were investigated. Fluorescence and UV-Vis spectroscopy indicated that SYPHs tended to unfold with increasing intensity and shift in wavelengths to more flexible conformations under PFW and UPFW treatments. Particle size distribution and microstructure analysis revealed that treatments could disrupt aggregation of protein molecules to increase the roughness, specific surface area, and decrease the particle size of peptides during hydrolysis. The partially denatured structure of SYPHs induced by treatments increased the susceptibility of the fish proteins to exogenous enzymes, thereby accelerating the hydrolytic process to yield peptides with improved solubility, decreased emulsifying and foaming properties, and improved enzyme-specific antioxidant properties. The results revealed that the functionality of SYPHs was influenced by the treatment method and the enzyme type employed.
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Affiliation(s)
- Okon Johnson Esua
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
- Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Da-Wen Sun
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
- Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
- Food Refrigeration and Computerized Food Technology (FRCFT), Agriculture and Food Science Centre, University College Dublin, National University of Ireland, Belfield, Dublin 4, Ireland
- Corresponding author. http://www.ucd.ie/refrighttp://www.ucd.ie/sun
| | - Jun-Hu Cheng
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
- Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Huifen Wang
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
- Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Mingchun Lv
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
- Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
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Van Orman BL, Wu HT, Julian RR. Differentiation of peptide isomers by excited-state photodissociation and ion-molecule interactions. Phys Chem Chem Phys 2020; 22:23678-23685. [PMID: 33052992 DOI: 10.1039/d0cp04111d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Solvochromatic effects are most frequently associated with solution-phase phenomena. However, in the gas phase, the absence of solvent leads to intramolecular solvation that can be driven by strong forces including hydrogen bonds and ion-dipole interactions. Here we examine whether isomerization of a single residue in a peptide results in structural changes sufficient to shift the absorption of light by an appended chromophore. By carrying out the experiments inside a mass spectrometer, we can easily monitor photodissociation yield as a readout for chromophore excitation. A series of peptides of different lengths, charge states, and position and identity of the isomerized residue were examined by excitation with both 266 and 213 nm light. The results reveal that differences in intramolecular solvation do lead to solvochromatic shifts in many cases. In addition, the primary product following photoexcitation is a radical. Ion-molecule reactions with this radical and adventitious oxygen were monitored and also found to vary as a function of isomeric state. In this case, differences in intramolecular solvation alter the availability of the reactive radical. Overall, the results reveal that small changes in a single amino acid can influence the overall structural ensemble sufficient to alter the efficiency of multiple gas-phase reactions.
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Affiliation(s)
- Brielle L Van Orman
- Department of Chemistry, University of California, Riverside, California 92521, USA.
| | - Hoi-Ting Wu
- Department of Chemistry, University of California, Riverside, California 92521, USA.
| | - Ryan R Julian
- Department of Chemistry, University of California, Riverside, California 92521, USA.
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Pereverzev AY, Koczor-Benda Z, Saparbaev E, Kopysov VN, Rosta E, Boyarkin OV. Spectroscopic Evidence for Peptide-Bond-Selective Ultraviolet Photodissociation. J Phys Chem Lett 2020; 11:206-209. [PMID: 31846339 DOI: 10.1021/acs.jpclett.9b03221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We study the photodissociation induced by ultraviolet excitation of amide bonds in gas-phase protonated peptides. Jointly, mass spectrometry and cold ion spectroscopy provide evidence for a selective nonstatistical dissociation of specific peptide bonds in the spectral region of the formally forbidden n → π* transition of amide groups. Structural analysis reveals that the activation of this transition, peaked at 226 nm, originates from the nonplanar geometry of the bond. In contrast, the statistical dissociation in the electronic ground state appears to be the main outcome of the π → π* excitation of the peptide bonds at 193 nm. We propose a tentative model that explains the difference in the fragmentation mechanisms by the difference in localization of the electronic transitions and the higher amount of vibrational energy released in the electronic excited state upon absorption at 193 nm.
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Affiliation(s)
- Aleksandr Y Pereverzev
- Laboratoire de Chimie Physique Moléculaire , École Polytechnique Fédérale de Lausanne , Station-6 , 1015 Lausanne , Switzerland
| | - Zsuzsanna Koczor-Benda
- Department of Chemistry , King's College London , Britannia House, 7 Trinity Street , London SE1 1DB , United Kingdom
| | - Erik Saparbaev
- Laboratoire de Chimie Physique Moléculaire , École Polytechnique Fédérale de Lausanne , Station-6 , 1015 Lausanne , Switzerland
| | - Vladimir N Kopysov
- Laboratoire de Chimie Physique Moléculaire , École Polytechnique Fédérale de Lausanne , Station-6 , 1015 Lausanne , Switzerland
| | - Edina Rosta
- Department of Chemistry , King's College London , Britannia House, 7 Trinity Street , London SE1 1DB , United Kingdom
| | - Oleg V Boyarkin
- Laboratoire de Chimie Physique Moléculaire , École Polytechnique Fédérale de Lausanne , Station-6 , 1015 Lausanne , Switzerland
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Affiliation(s)
- Oleg V. Boyarkin
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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