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Broz M, Oostenbrink C, Bren U. The Effect of Microwaves on Protein Structure: Molecular Dynamics Approach. J Chem Inf Model 2024; 64:2077-2083. [PMID: 38477115 PMCID: PMC10966651 DOI: 10.1021/acs.jcim.3c01937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 02/28/2024] [Accepted: 02/29/2024] [Indexed: 03/14/2024]
Abstract
The impact of microwave (MW) irradiation on protein folding, potentially inciting misfolding, was investigated by employing molecular dynamics (MD) simulations. Twenty-nine proteins were subjected to MD simulations under equilibrium (300 K) and MW conditions, where the rotational temperature was elevated to 700 K. The utilized replacement model captures the microwave effects of δ- and γ-relaxation processes (frequency range of ∼300 MHz to ∼20 GHz). The results disclosed that MW heating incited a shift toward more compact protein conformations, as indicated by decreased root-mean-square deviations, root-mean-square fluctuations, head-to-tail distances, and radii of gyration. This compaction was attributed to the intensification of intramolecular electrostatic interactions and hydrogen bonds within the protein caused by MW-destabilized hydrogen bonds between the protein and solvent. The solvent-accessible surface area (SASA), particularly that of polar amino-acid residues, shrank under MW conditions, corresponding to a reduced polarity of the water solvent. However, MW irradiation produced no significant alterations in protein secondary structures; hence, MW heating was observed to primarily affect the protein tertiary structures.
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Affiliation(s)
- Matic Broz
- Faculty
of Chemistry and Chemical Engineering, University
of Maribor, Smetanova ulica 17, Maribor SI-2000, Slovenia
| | - Chris Oostenbrink
- Institute
of Molecular Modeling and Simulation, University
of Natural Resources and Life Sciences, Muthgasse 18, Vienna 1190, Austria
| | - Urban Bren
- Faculty
of Chemistry and Chemical Engineering, University
of Maribor, Smetanova ulica 17, Maribor SI-2000, Slovenia
- Faculty
of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Glagoljaška ulica 8, Koper SI-6000, Slovenia
- Institute
of Environmental Protection and Sensors, Beloruska ulica 7, Maribor SI-2000, Slovenia
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2
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Asakuma Y, Maeda T, Takai T, Hyde A, Phan C, Ito S, Taue S. Microwaves reduce water refractive index. Sci Rep 2022; 12:11562. [PMID: 35799049 PMCID: PMC9262909 DOI: 10.1038/s41598-022-15853-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 06/30/2022] [Indexed: 11/15/2022] Open
Abstract
Microwaves, long used as a convenient household appliance, have been increasingly used in industrial processes such as organic synthesis and oil processing. It has been proposed that microwaves can enhance these chemical processes via a non-thermal effect. Here we report the instantaneous effect of microwaves on the permittivity and phase velocity of light in water through the in-situ measurement of changes in refractive index. Microwave irradiation was found to reduce the water refractive index (RI) sharply. The reduction increased as a function of microwave power to a far greater extent than expected from the change in temperature. The phase velocity of light in water increases up to ~ 5% (RI of 1.27) during microwave irradiation. Upon stopping irradiation, the return to the equilibrium RI was delayed by up to 30 min. Our measurement shows that microwaves have a profound non-thermal and long-lasting effect on the properties of water. Further investigation is planned to verify if the observed RI reduction is restricted to the region near the surface or deep inside water bulk. The observation suggests a relationship between microwave-induced and the enhanced aqueous reactions.
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Affiliation(s)
- Yusuke Asakuma
- Department of Chemical Engineering, University of Hyogo, Shosha 2167, Himeji, 671-2280, Japan.
| | - Tomoisa Maeda
- Department of Chemical Engineering, University of Hyogo, Shosha 2167, Himeji, 671-2280, Japan
| | - Takahiro Takai
- Department of Chemical Engineering, University of Hyogo, Shosha 2167, Himeji, 671-2280, Japan
| | - Anita Hyde
- Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA, 6845, Australia
| | - Chi Phan
- Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA, 6845, Australia
| | - Shinya Ito
- School of System Engineering, Kochi University of Technology, Kami, Kochi, 782-8502, Japan
| | - Shuji Taue
- School of System Engineering, Kochi University of Technology, Kami, Kochi, 782-8502, Japan
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3
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Chen T, Wu Y, Liu F, Zhang N, Yan B, Zhao J, Zhang H, Chen W, Fan D. Unusual gelation behavior of low-acetyl gellan under microwave field: Changes in rheological and hydration properties. Carbohydr Polym 2022; 296:119930. [DOI: 10.1016/j.carbpol.2022.119930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 07/12/2022] [Accepted: 07/26/2022] [Indexed: 11/17/2022]
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4
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Gou D, Huang K, Liu Y, Shi H, Wu Z. Investigation of Spatial Orientation and Kinetic Energy of Reactive Site Collision between Benzyl Chloride and Piperidine: Novel Insight into the Microwave Nonthermal Effect. J Phys Chem A 2022; 126:2690-2705. [PMID: 35447029 DOI: 10.1021/acs.jpca.2c01487] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Microwave nonthermal effect in chemical reactions is still an uncertain problem. In this work, we have studied the spatial orientation and kinetic energy of reactive site collision between benzyl chloride and piperidine molecules in substitution reaction under microwave irradiation using the molecular dynamics simulation. Our results showed that microwave polarization can change the spatial orientation of reactive site collision. Collision probability between the Cl atom of the C-Cl group of benzyl chloride and the H atom of the N-H group of piperidine increased by up to 33.5% at an effective spatial solid angle (θ, φ) of (100∼110°, 170∼190°) under microwave irradiation. Also, collision probability between the C atom of the C-Cl group of benzyl chloride and the N atom of the N-H group of piperidine also increased by up to 25.6% at an effective spatial solid angle (θ, φ) of (85∼95°, 170∼190°). Moreover, the kinetic energy of collision under microwave irradiation was also changed, that is, for the collision between the Cl atom of the C-Cl group and the H atom of the N-H group, the fraction of high-energy collision greater than 6.39 × 10-19 J increased by 45.9 times under microwave irradiation, and for the collision between the C atom of the C-Cl group and the N atom of the N-H group, the fraction of high-energy collision greater than 6.39 × 10-19 J also increased by 29.2 times. Through simulation, the reaction rate increased by 34.4∼50.3 times under microwave irradiation, which is close to the experimental increase of 46.3 times. In the end, spatial orientation and kinetic energy of molecular collision changed by microwave polarization are summarized as the microwave postpolarization effect. This effect provides a new insight into the physical mechanism of the microwave nonthermal effect.
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Affiliation(s)
- Dezhi Gou
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China
| | - Kama Huang
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China
| | - Ying Liu
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China
| | - Hongxiao Shi
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China
| | - Zhiyan Wu
- College of Electronic and Electrical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
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5
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Wu S, Yang X, Jing H, Chu Y, Zhu Z, Yuan J. Experiment and molecular dynamics simulation of methylglyoxal aqueous solution under weak microwave irradiation. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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6
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Ozel HB, Cetin M, Sevik H, Varol T, Isik B, Yaman B. The effects of base station as an electromagnetic radiation source on flower and cone yield and germination percentage in Pinus brutia Ten. Biol Futur 2021; 72:359-365. [PMID: 34554556 DOI: 10.1007/s42977-021-00085-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 04/19/2021] [Indexed: 12/26/2022]
Abstract
Electromagnetic radiation is a substantial pollution factor that most of the living things found almost everywhere are constantly exposed to with current technology. The number of studies conducted on the effects of this exposed radiation on the living things constantly is limited; and almost all of the studies conducted are aimed at measuring the effects of short-term exposure. In addition to this, most of the studies conducted on plants focus on herbaceous plant species. In this study, the effects of distance to base station on flower and cone yield and germination percentage were investigated in Pinus brutia individuals, one of the critical forest tree species. The study results revealed that being close to the base station significantly reduced the number of flowers and cones in P. brutia individuals, and that the values obtained in individuals at a distance of 800 m from the base station were 11 times more than the number of flowers and 7 times more than the number of cones compared to the individuals at a distance of 100 m. In the seeds subject to the study, there is a three-times difference in terms of the germination percentage among the individuals located at the furthest and closest distance to the base station. These results show that P. brutia individuals are considerably affected by the base station.
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Affiliation(s)
- Halil Baris Ozel
- Faculty of Forestry, Department of Forest Engineering, Bartin University, Bartin, Turkey
| | - Mehmet Cetin
- Faculty of Engineering and Architecture, Department of Landscape Architecture, Kastamonu University, Kuzeykent Campus, 37150, Kastamonu, Turkey.
| | - Hakan Sevik
- Faculty of Engineering and Architecture, Department of Environmental Engineering, Kastamonu University, Kuzeykent Campus, 37150, Kastamonu, Turkey
| | - Tugrul Varol
- Faculty of Forestry, Department of Forest Engineering, Bartin University, Bartin, Turkey
| | - Berkant Isik
- Faculty of Forestry, Department of Forest Engineering, Bartin University, Bartin, Turkey
| | - Barbaros Yaman
- Faculty of Forestry, Department of Forest Engineering, Bartin University, Bartin, Turkey
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Wang C, Liu H, Song L, Tan J, Yang W, Cheng L. Temperature evolution, atomistic hot‐spot effects and thermal runaway during microwave heating of polyacrylonitrile: A ReaxFF molecular dynamics simulation. NANO SELECT 2021. [DOI: 10.1002/nano.202100061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Chenhui Wang
- College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing P. R. China
| | - Han Liu
- College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing P. R. China
| | - Lijian Song
- College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing P. R. China
| | - Jing Tan
- College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing P. R. China
| | - Weimin Yang
- College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing P. R. China
- State Key Laboratory of Organic‐Inorganic Composites Beijing University of Chemical Technology Beijing P. R. China
| | - Lisheng Cheng
- College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing P. R. China
- State Key Laboratory of Organic‐Inorganic Composites Beijing University of Chemical Technology Beijing P. R. China
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8
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Incoherent microwaves heating of water: A combined experimental and simulated investigation. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138528] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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9
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Baghdasaryan Z, Babajanyan A, Odabashyan L, Lee JH, Friedman B, Lee K. Visualization of microwave near-field distribution in sodium chloride and glucose aqueous solutions by a thermo-elastic optical indicator microscope. Sci Rep 2021; 11:2589. [PMID: 33510224 PMCID: PMC7843988 DOI: 10.1038/s41598-020-80328-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 12/21/2020] [Indexed: 01/30/2023] Open
Abstract
In this study, a new optical method is presented to determine the concentrations of NaCl and glucose aqueous solutions by using a thermo-elastic optical indicator microscope. By measuring the microwave near-field distribution intensity, concentration changes of NaCl and glucose aqueous solutions were detected in the 0-100 mg/ml range, when exposed to microwave irradiation at 12 GHz frequency. Microwave near-field distribution intensity decreased as the NaCl or glucose concentration increased due to the changes of the absorption properties of aqueous solution. This method provides a novel approach for monitoring NaCl and glucose in biological liquids by using a CCD sensor capable of visualizing NaCl and glucose concentrations without scanning.
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Affiliation(s)
- Zhirayr Baghdasaryan
- Department of Physics, Sogang University, Seoul, 121-742, Korea
- Department of Radiophysics, Yerevan State University, 0025, Yerevan, Armenia
| | - Arsen Babajanyan
- Department of Radiophysics, Yerevan State University, 0025, Yerevan, Armenia
| | - Levon Odabashyan
- Department of Radiophysics, Yerevan State University, 0025, Yerevan, Armenia
| | - Jung-Ha Lee
- Department of Life Science, Sogang University, Seoul, 121-742, Korea
| | - Barry Friedman
- Department of Physics, Sam Houston State University, Huntsville, TX, 77341, USA
| | - Kiejin Lee
- Department of Physics, Sogang University, Seoul, 121-742, Korea.
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10
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Improved solubility and interface properties of pigskin gelatin by microwave irradiation. Int J Biol Macromol 2021; 171:1-9. [PMID: 33412193 DOI: 10.1016/j.ijbiomac.2020.12.215] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/26/2020] [Accepted: 12/28/2020] [Indexed: 11/23/2022]
Abstract
In this study, the microwave irradiation as a green approach was applied to improve the properties (mainly solubility and interface properties) of pigskin gelatin. The results showed that the solubility of pigskin gelatin was improved obviously at room temperature (25 °C) due to the destruction of polymer subunits. Furthermore, the exposure of more hydrophobic groups in microwave-irradiated gelatin increased its hydrophobicity, consequently improving the amphiphilic property and the interfacial properties of gelatin. The results of interface behavior showed that the interfacial tension of microwave-irradiated gelatin was reduced obviously with the extension of irradiation time (0-30 min), which is more beneficial to adsorption of gelatin molecules at the interface, thus resulting in a significant increase of adsorption rate (AP) from 56.13% (0 min) to 91.87% (30 min). Correspondingly, the foaming and emulsifying properties of gelatin were also improved significantly (p < 0.05). This study would promote the development of food-grade foam and emulsion based on pigskin gelatin by adjusting solubility and interface properties.
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11
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Gladovic M, Oostenbrink C, Bren U. Could Microwave Irradiation Cause Misfolding of Peptides? J Chem Theory Comput 2020; 16:2795-2802. [PMID: 32163704 PMCID: PMC7309322 DOI: 10.1021/acs.jctc.9b01104] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Indexed: 11/29/2022]
Abstract
Microwaves have been experimentally shown to affect the folding dynamics of peptides and proteins. Using molecular dynamics, we performed all-atom simulations of a model β-peptide in aqueous solution where individual degrees of freedom of solvent molecules were decoupled to allow for investigation at non-equilibrium microwave-irradiated conditions. An elevated rotational temperature of the water medium was found to significantly affect the conformation of the peptide due to the weakened hydrogen-bonding interactions with the surrounding solvent molecules. Cluster analysis revealed that microwave irradiation can indeed act as a promoter in the formation of new misfolded peptide structures of the hairpin type, which are generally associated with the onset of several neurodegenerative disorders such as Alzheimer's, Parkinson's, Huntington's, and Creutzfeldt-Jakob diseases as well as certain cancer types such as amyloidosis.
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Affiliation(s)
- Martin Gladovic
- Faculty
of Chemistry and Chemical Technology, University
of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
| | - Chris Oostenbrink
- Institute
of Molecular Modeling and Simulation, University
of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria
| | - Urban Bren
- Faculty
of Chemistry and Chemical Technology, University
of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
- National
Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
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12
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13
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Zhang L, Fan J, Qu M. MD Simulations on the Transport Behaviors of Mixed Na+ and Li+ in a Transmembrane Cyclic Peptide Nanotube under an Electric Field. J Chem Inf Model 2018; 59:170-180. [DOI: 10.1021/acs.jcim.8b00593] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lingling Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
| | - Jianfen Fan
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
| | - Mengnan Qu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
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