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Torres V, Contreras V, Gutiérrez B, San Francisco J, Catalán A, Vega JL, Moon KM, Foster LJ, de Almeida RF, Kalergis AM, González J. Oral infectivity through carnivorism in murine model of Trypanosoma cruzi infection. Front Cell Infect Microbiol 2024; 14:1297099. [PMID: 38495650 PMCID: PMC10941204 DOI: 10.3389/fcimb.2024.1297099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 01/11/2024] [Indexed: 03/19/2024] Open
Abstract
Introduction Oral transmission of T. cruzi is probably the most frequent transmission mechanism in wild animals. This observation led to the hypothesis that consuming raw or undercooked meat from animals infected with T. cruzi may be responsible for transmitting the infection. Therefore, the general objective of this study was to investigate host-pathogen interactions between the parasite and gastric mucosa and the role of meat consumption from infected animals in the oral transmission of T. cruzi. Methods Cell infectivity assays were performed on AGS cells in the presence or absence of mucin, and the roles of pepsin and acidic pH were determined. Moreover, groups of five female Balb/c mice were fed with muscle tissue obtained from mice in the acute phase of infection by the clone H510 C8C3hvir of T. cruzi, and the infection of the fed mice was monitored by a parasitemia curve. Similarly, we assessed the infective capacity of T. cruzi trypomastigotes and amastigotes by infecting groups of five mice Balb/c females, which were infected orally using a nasogastric probe, and the infection was monitored by a parasitemia curve. Finally, different trypomastigote and amastigote inoculums were used to determine their infective capacities. Adhesion assays of T. cruzi proteins to AGS stomach cells were performed, and the adhered proteins were detected by western blotting using monoclonal or polyclonal antibodies and by LC-MS/MS and bioinformatics analysis. Results Trypomastigote migration in the presence of mucin was reduced by approximately 30%, whereas in the presence of mucin and pepsin at pH 3.5, only a small proportion of parasites were able to migrate (∼6%). Similarly, the ability of TCTs to infect AGS cells in the presence of mucin is reduced by approximately 20%. In all cases, 60-100% of the animals were fed meat from mice infected in the acute phase or infected with trypomastigotes or amastigotes developed high parasitemia, and 80% died around day 40 post-infection. The adhesion assay showed that cruzipain is a molecule of trypomastigotes and amastigotes that binds to AGS cells. LC-MS/MS and bioinformatics analysis, also confirmed that transialidase, cysteine proteinases, and gp63 may be involved in TCTs attachment or invasion of human stomach cells because they can potentially interact with different proteins in the human stomach mucosa. In addition, several human gastric mucins have cysteine protease cleavage sites. Discussion Then, under our experimental conditions, consuming meat from infected animals in the acute phase allows the T. cruzi infection. Similarly, trypomastigotes and amastigotes could infect mice when administered orally, whereas cysteinyl proteinases and trans-sialidase appear to be relevant molecules in this infective process.
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Affiliation(s)
- Víctor Torres
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | | | - Bessy Gutiérrez
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Juan San Francisco
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Alejandro Catalán
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - José Luis Vega
- Departamento de Fisiologia, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - Kyung-Mee Moon
- Department of Biochemistry & Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Leonard J. Foster
- Department of Biochemistry & Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Rafael F. de Almeida
- Laboratório de Biologia Molecular e Sistêmica de Tripanossomatídeos (Labtryp), Instituto Carlos Chagas Fiocruz (ICC-Fiocruz), Curitiba, Paraná, Brazil
| | - Alexis M. Kalergis
- Millennium Institute of Immunology and Immunotherapy, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
- Departamento de Endocrinología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Jorge González
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
- Millennium Institute of Immunology and Immunotherapy, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
- Research Center in Immunology and Biomedical Biotechnology of Antofagasta, Universidad de Antofagasta, Antofagasta, Chile
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San Francisco J, Astudillo C, Vega JL, Catalán A, Gutiérrez B, Araya JE, Zailberger A, Marina A, García C, Sanchez N, Osuna A, Vilchez S, Ramírez MI, Macedo J, Feijoli VS, Palmisano G, González J. Trypanosoma cruzi pathogenicity involves virulence factor expression and upregulation of bioenergetic and biosynthetic pathways. Virulence 2022; 13:1827-1848. [PMID: 36284085 PMCID: PMC9601562 DOI: 10.1080/21505594.2022.2132776] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The molecular repertoire of Trypanosoma cruzi effects its virulence and impacts the clinical course of the resulting Chagas disease. This study aimed to determine the mechanism underlying the pathogenicity of T. cruzi. Two T. cruzi cell lines (C8C3hvir and C8C3lvir), obtained from the clone H510 C8C3 and exhibiting different virulence phenotypes, were used to evaluate the parasite's infectivity in mice. The organ parasite load was analysed by qPCR. The proteomes of both T. cruzi cell lines were compared using nLC-MS/MS. Cruzipain (Czp), complement regulatory protein (CRP), trans-sialidase (TS), Tc-85, and sialylated epitope expression levels were evaluated by immunoblotting. High-virulence C8C3hvir was highly infectious in mice and demonstrated three to five times higher infectivity in mouse myocardial cells than low-virulence C8C3lvir. qPCR revealed higher parasite loads in organs of acute as well as chronically C8C3hvir-infected mice than in those of C8C3lvir-infected mice. Comparative quantitative proteomics revealed that 390 of 1547 identified proteins were differentially regulated in C8C3hvir with respect to C8C3lvir. Amongst these, 174 proteins were upregulated in C8C3hvir and 216 were downregulated in C8C3lvir. The upregulated proteins in C8C3hvir were associated with the tricarboxylic acid cycle, ribosomal proteins, and redoxins. Higher levels of Czp, CRP, TS, Tc-85, and sialylated epitopes were expressed in C8C3hvir than in C8C3lvir. Thus, T. cruzi virulence may be related to virulence factor expression as well as upregulation of bioenergetic and biosynthetic pathways proteins.
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Affiliation(s)
- Juan San Francisco
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Constanza Astudillo
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - José Luis Vega
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile,Laboratory of Gap Junction Proteins and Parasitic Disease, Instituto Antofagasta, Universidad de Antofagasta, Antofagasta, Chile,Research Center in Immunology and Biomedical Biotechnology of Antofagasta, Antofagasta, Chile
| | - Alejandro Catalán
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Bessy Gutiérrez
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Jorge E Araya
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | | | - Anabel Marina
- Centro de Biología Molecular Severo Ochoa Universidad Autonoma de Madrid, Madrid, Spain
| | - Carlos García
- Centro de Biología Molecular Severo Ochoa Universidad Autonoma de Madrid, Madrid, Spain
| | - Nuria Sanchez
- Centro de Biología Molecular Severo Ochoa Universidad Autonoma de Madrid, Madrid, Spain
| | - Antonio Osuna
- Institute of Biotechnology, University of Granada, Granada, Spain
| | - Susana Vilchez
- Institute of Biotechnology, University of Granada, Granada, Spain
| | - Marcel I Ramírez
- Laboratório de Biologia Molecular e Sistemática de Trypanosomatides, Instituto Carlos Chagas, Fiocruz, Parana, Brazil
| | - Janaina Macedo
- Department of Parasitology, University of Sao Paulo, Sao Paulo, Brazil
| | | | | | - Jorge González
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile,Research Center in Immunology and Biomedical Biotechnology of Antofagasta, Antofagasta, Chile,Laboratório de Biologia Molecular e Sistemática de Trypanosomatides, Millennium Institute on Immunology and Immunotherapy, Antofagasta, Chile,CONTACT Jorge González
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Trabelsi T, Mahjoubi K, Mehnen B, Hochlaf M, Francisco JS. Spectroscopy and characterization of AlNX (X = O and S): Triatomic circumstellar molecules. J Chem Phys 2019; 150:124306. [PMID: 30927867 DOI: 10.1063/1.5088589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Three isomers of the triatomic [Al, N, O] molecular system have been observed in a solid argon matrix by infrared absorption spectroscopy using 15N and 18O isotopic substitution. The present work provides high-level quantum chemical predictions of their spectroscopic parameters to observe this system in the interstellar medium. The spectroscopic parameters, stability, and geometries of the lowest stable isomers of its isoelectronic system [Al, N, S] were characterized using coupled-cluster CCSD(T), explicitly correlated coupled-cluster CCSD(T)-F12, and multireference configuration interaction. The three-dimensional potential energy surfaces of all isomers were computed at the CCSD(T)-F12/aug-cc-pV5Z level, and a set of spectroscopic parameters were calculated. In both systems, the most stable isomer is linear with an X3Σ- electronic ground state, and all linear isomers are characterized by small bending modes of less than 200 cm-1. Due to their large dipole moments, the high intensities of such modes, and the nonexistence of anharmonic resonance complicating their spectra, our results facilitate the detection of AlNO and AlNS in the laboratory or in the interstellar medium.
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Affiliation(s)
- T Trabelsi
- Department of Earth and Environment Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, USA
| | - K Mahjoubi
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - B Mehnen
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - J S Francisco
- Department of Earth and Environment Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, USA
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Trabelsi T, Mahjoubi K, Mehnen B, Hochlaf M, Francisco JS. Spectroscopy and Stability of AlOP: A Possible Progenitor of Interstellar Metal. J Phys Chem A 2019; 123:463-470. [PMID: 30404446 DOI: 10.1021/acs.jpca.8b07843] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Standard and explicitly correlated coupled-cluster theory computations in conjunction with large basis sets are performed to characterize [Al,P,O] isomers. Three isomers, namely, linear-AlOP, bent-AlOP, and linear-OAlP, are found to be stable species. Their optimized equilibrium geometries, harmonic vibrational frequencies, rotational constants, and relative energies are deduced. In addition, a set of spectroscopic parameters is generated from the three-dimensional potential energy surfaces of each isomer at the (R)CCSD(T)/aug-cc-pV5Z level. The linear isomers have an X3Σ- electronic ground state and are characterized as weakly bound systems or floppy molecules due to their low-frequency bending modes (<150 cm-1). The dipole moment of linear-AlOP is calculated to be 1.48 D. By comparison, a much larger dipole moment is computed for linear-OAlP (5.01 D), indicating lower ionic character in AlOP. Both the linear-OAlP and linear-AlOP isomers are suggested to be good candidates for detection in interstellar media by radio astronomy.
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Affiliation(s)
- T Trabelsi
- Department of Earth and Environment Science and Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104-6243 , United States
| | - K Mahjoubi
- Laboratoire Modélisation et Simulation Multi Echelle , Université Paris-Est, MSME UMR 8208 CNRS , 5 bd Descartes , 77454 Marne-la-Vallée , France
| | - B Mehnen
- Laboratoire Modélisation et Simulation Multi Echelle , Université Paris-Est, MSME UMR 8208 CNRS , 5 bd Descartes , 77454 Marne-la-Vallée , France
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle , Université Paris-Est, MSME UMR 8208 CNRS , 5 bd Descartes , 77454 Marne-la-Vallée , France
| | - J S Francisco
- Department of Earth and Environment Science and Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104-6243 , United States
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Martins-Costa MTC, Anglada JM, Francisco JS, Ruiz-López MF. Impacts of cloud water droplets on the OH production rate from peroxide photolysis. Phys Chem Chem Phys 2018; 19:31621-31627. [PMID: 29164201 DOI: 10.1039/c7cp06813a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the difference between observed and modeled concentrations of HOx radicals in the troposphere is a current major issue in atmospheric chemistry. It is widely believed that existing atmospheric models miss a source of such radicals and several potential new sources have been proposed. In recent years, interest has increased on the role played by cloud droplets and organic aerosols. Computer modeling of ozone photolysis, for instance, has shown that atmospheric aqueous interfaces accelerate the associated OH production rate by as much as 3-4 orders of magnitude. Since methylhydroperoxide is a main source and sink of HOx radicals, especially at low NOx concentrations, it is fundamental to assess what is the influence of clouds on its chemistry and photochemistry. In this study, computer simulations for the photolysis of methylhydroperoxide at the air-water interface have been carried out showing that the OH production rate is severely enhanced, reaching a comparable level to ozone photolysis.
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Affiliation(s)
- M T C Martins-Costa
- SRSMC, University of Lorraine, CNRS, BP 70239, 54506 Vandoeuvre-lès-Nancy, France.
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Bonnet L, Linguerri R, Hochlaf M, Yazidi O, Halvick P, Francisco JS. Full-Dimensional Theory of Pair-Correlated HNCO Photofragmentation. J Phys Chem Lett 2017; 8:2420-2424. [PMID: 28498666 DOI: 10.1021/acs.jpclett.7b00920] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Full-dimensional semiclassical dynamical calculations combining classical paths and Bohr quantization of product internal motions are reported for the prototype photofragmentation of isocyanic acid in the S1 state. These calculations allow one to closely reproduce for the first time key features of state-of-the-art imaging measurements at photolysis wavelengths of 201 and 210 nm while providing insight into the underlying dissociation mechanism. Quantum scattering calculations being beyond reach for most polyatomic fissions, pair-correlated data on these processes are much more often measured than predicted. Our theoretical approach can be used to fill this gap.
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Affiliation(s)
- L Bonnet
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS, UMR 5255 , 33405 Talence, France
| | - R Linguerri
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, UMR 8208 CNRS , 5 Bd Descartes, 77454 Marne La Vallée, France
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, UMR 8208 CNRS , 5 Bd Descartes, 77454 Marne La Vallée, France
| | - O Yazidi
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, LR01ES09, Faculté des Sciences de Tunis, Université de Tunis El Manar , 2092 Tunis, Tunisia
| | - P Halvick
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS, UMR 5255 , 33405 Talence, France
| | - J S Francisco
- Department of Chemistry, University of Nebraska-Lincoln , 433 Hamilton Hall, Lincoln, Nebraska 68588-0304, United States
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Toumi I, Yazidi O, Jaidane NE, Al Mogren MM, Francisco JS, Hochlaf M. Stereoisomers of hydroxymethanes: Probing structural and spectroscopic features upon substitution. J Chem Phys 2016; 145:244305. [PMID: 28049302 DOI: 10.1063/1.4972415] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Ab initio studies on CHx(OH)4-x (x = 0-3) polyols are carried out to derive their structural and spectroscopic features. Several stereoisomers (both equilibrium structures and transition states) are found. Some are predicted here for the first time. We determined hence their geometrical parameters, vibrational frequencies, electronic excitation energies for the singlet manifold, and IR spectra. While the IR spectra for all polyols present similar shapes, their UV spectra exhibit however distinct band origin that are specific to each polyol and more interestingly to each diasteroisomer. Stereoelectronic effects are also noticed and discussed. It is suggested that UV spectroscopy is an efficient probe to experimentally identify polyols in mixtures involving polyols.
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Affiliation(s)
- I Toumi
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - O Yazidi
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - N-E Jaidane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - M Mogren Al Mogren
- Chemistry Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - J S Francisco
- Department of Chemistry and Department of Earth and Atmospheric Science, Purdue University, West Lafayette, Indiana 49707, USA
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est, 5 Blvd. Descartes, 77454 Marne-la-Vallée, France
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San Francisco J, Barría I, Gutiérrez B, Neira I, Muñoz C, Sagua H, Araya JE, Andrade JC, Zailberger A, Catalán A, Remonsellez F, Vega JL, González J. Decreased cruzipain and gp85/trans-sialidase family protein expression contributes to loss of Trypanosoma cruzi trypomastigote virulence. Microbes Infect 2016; 19:55-61. [PMID: 27553285 DOI: 10.1016/j.micinf.2016.08.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 08/02/2016] [Accepted: 08/10/2016] [Indexed: 10/21/2022]
Abstract
Two cell lines derived from a single Trypanosoma cruzi clone by long-term passaging generated a highly virulent (C8C3hvir) and a low virulent (C8C3lvir) cell line. The C8C3hvir cell line was highly infective and lethal to Balb/c mice, and the C8C3lvir cell line was three- to five-fold less infective to mouse cardiomyocytes than C8C3hvir. The highly virulent T. cruzi cell line abundantly expressed the major cysteine proteinase cruzipain (Czp), complement regulatory protein (CRP) and trans-sialidase (TS), all of which are known to act as virulence factors in this parasite. The in vitro invasion capacity and in vivo Balb/c mouse infectiveness of the highly virulent strain was strongly reduced by pre-treatment with antisense oligonucleotides targeting TS or CRP or with E64d. Based on these results, we conclude that decreased levels of TS, CRP and Czp expression could contribute to loss of T. cruzi trypomastigote virulence.
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Affiliation(s)
- Juan San Francisco
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Iván Barría
- Experimental Physiology Laboratory (EPhyL), Antofagasta Institute, University of Antofagasta, Antofagasta, Chile
| | - Bessy Gutiérrez
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Iván Neira
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Christian Muñoz
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Hernán Sagua
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Jorge E Araya
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Juan Carlos Andrade
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | | | - Alejandro Catalán
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile
| | - Francisco Remonsellez
- Applied Microbiology and Extremophiles Laboratory, Chemical Engineering Department, North Catholic University, Antofagasta, Chile
| | - José Luis Vega
- Experimental Physiology Laboratory (EPhyL), Antofagasta Institute, University of Antofagasta, Antofagasta, Chile
| | - Jorge González
- Molecular Parasitology Unit, Medical Technology Department, University of Antofagasta, Antofagasta, Chile.
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Trabelsi T, Ajili Y, Ben Yaghlane S, Jaidane NE, Mogren Al-Mogren M, Francisco JS, Hochlaf M. Characterization and reactivity of the weakly bound complexes of the [H, N, S](-) anionic system with astrophysical and biological implications. J Chem Phys 2015. [PMID: 26203023 DOI: 10.1063/1.4926941] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigate the lowest electronic states of doublet and quartet spin multiplicity states of HNS(-) and HSN(-) together with their parent neutral triatomic molecules. Computations were performed using highly accurate ab initio methods with a large basis set. One-dimensional cuts of the full-dimensional potential energy surfaces (PESs) along the interatomic distances and bending angle are presented for each isomer. Results show that the ground anionic states are stable with respect to the electron detachment process and that the long range parts of the PESs correlating to the SH(-) + N, SN(-) + H, SN + H(-), NH + S(-), and NH(-) + S are bound. In addition, we predict the existence of long-lived weakly bound anionic complexes that can be formed after cold collisions between SN(-) and H or SH(-) and N. The implications for the reactivity of these species are discussed; specifically, it is shown that the reactions involving SH(-), SN(-), and NH(-) lead either to the formation of HNS(-) or HSN(-) in their electronic ground states or to autodetachment processes. Thus, providing an explanation for why the anions, SH(-), SN(-), and NH(-), have limiting detectability in astrophysical media despite the observation of their corresponding neutral species. In a biological context, we suggest that HSN(-) and HNS(-) should be incorporated into H2S-assisted heme-catalyzed reduction mechanism of nitrites in vivo.
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Affiliation(s)
- T Trabelsi
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - Y Ajili
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - S Ben Yaghlane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - N-E Jaidane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - M Mogren Al-Mogren
- Chemistry Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Kingdom of Saudi Arabia
| | - J S Francisco
- Department of Chemistry and Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47906, USA
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 5 Blvd. Descartes, 77454 Marne-la-Vallée, France
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Ben Yaghlane S, Jaidane NE, Cotton CE, Francisco JS, Al Mogren MM, Linguerri R, Hochlaf M. Theoretical spectroscopic investigations of HNS(q) and HSN(q) (q = 0, +1, -1) in the gas phase. J Chem Phys 2015; 140:244309. [PMID: 24985640 DOI: 10.1063/1.4883915] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We performed accurate ab initio investigations of the geometric parameters and the vibrational structure of neutral HNS/HSN triatomics and their singly charged anions and cations. We used standard and explicitly correlated coupled cluster approaches in connection with large basis sets. At the highest levels of description, we show that results nicely approach those obtained at the complete basis set limit. Moreover, we generated the three-dimensional potential energy surfaces (3D PESs) for these molecular entities at the coupled cluster level with singles and doubles and a perturbative treatment of triple excitations, along with a basis set of augmented quintuple-zeta quality (aug-cc-pV5Z). A full set of spectroscopic constants are deduced from these potentials by applying perturbation theory. In addition, these 3D PESs are incorporated into variational treatment of the nuclear motions. The pattern of the lowest vibrational levels and corresponding wavefunctions, up to around 4000 cm(-1) above the corresponding potential energy minimum, is presented for the first time.
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Affiliation(s)
- S Ben Yaghlane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications - LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - N-E Jaidane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications - LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - C E Cotton
- Department of Chemistry and Department of Earth and Atmospheric Science, Purdue University, West Lafayette, Indiana 49707, USA
| | - J S Francisco
- Department of Chemistry and Department of Earth and Atmospheric Science, Purdue University, West Lafayette, Indiana 49707, USA
| | - M M Al Mogren
- Chemistry Department, Faculty of Science, King Saud University, PO Box 2455, Riyadh 11451, Kingdom of Saudi Arabia
| | - R Linguerri
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
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11
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Vöhringer-Martinez E, Hansmann B, Hernandez-Soto H, Hernandez H, Francisco JS, Troe J, Abel B. Water Catalysis of a Radical-Molecule Gas-Phase Reaction. Science 2007; 315:497-501. [PMID: 17255507 DOI: 10.1126/science.1134494] [Citation(s) in RCA: 253] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
There has been considerable speculation about the role of water and water complexes in chemical gas-phase reactions, including the conjecture that water may act as a molecular catalyst through its ability to form hydrogen bonds. Here, we present kinetic studies in which the effect of water on the rate of the reaction between hydroxyl radicals and acetaldehyde has been measured directly in Laval nozzle expansions at low temperatures. An increasing enhancement of the reaction rate by added water was found with decreasing temperatures between 300 and 60 kelvin. Quantum chemical calculations and statistical rate theory support our conclusions that this observation is due to the reduction of an intrinsic reaction barrier caused by specific water aggregation. The results suggest that even single water molecules can act as catalysts in radical-molecule reactions.
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Affiliation(s)
- E Vöhringer-Martinez
- Institut für Physikalische Chemie der Universität Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany
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12
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Plane JMC, Joseph DM, Allan BJ, Ashworth SH, Francisco JS. An Experimental and Theoretical Study of the Reactions OIO + NO and OIO + OH. J Phys Chem A 2005; 110:93-100. [PMID: 16392844 DOI: 10.1021/jp055364y] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The kinetics of the reaction OIO+NO were studied by pulsed laser photolysis/time-resolved cavity ring-down spectroscopy, yielding k(235-320 K)=7.6(+4.0)(-3.1) x 10(-13) exp[(607+/-128)/T] cm3 molecule-1 s-1. Quantum calculations on the OIO+NO potential-energy surface show that the reactants form a weakly bound OIONO intermediate, which then dissociates to the products IO+NO2. Rice-Ramsberger-Kassel-Markus (RRKM) calculations on this surface are in good accord with the experimental result. The most stable potential product, IONO2, cannot form because of the significant rearrangement of OIONO that would be required. The reaction OIO+OH was then investigated by quantum calculations of the relevant stationary points on its potential-energy surface. The very stable HOIO2 molecule can form by direct recombination, but the bimolecular reaction channels to HO2+IO and HOI+O2 are closed because of significant energy barriers. RRKM calculations of the HOIO2 recombination rate coefficient yield krec,0=1.5x10(-27) (T/300 K)(-3.93) cm6 molecule-2 s-1, krec,infinity=5.5x10(-10) exp(46/T) cm3 molecule-1 s-1, and Fc=0.30. The rate coefficients of both reactions are fast enough around 290 K and 1 atm pressure for these reactions to play a potentially important role in the gas phase and aerosol chemistry in the marine boundary layer of the atmosphere.
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Affiliation(s)
- J M C Plane
- School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK.
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13
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Chiappero MS, Argüello GA, Garcia P, Pernice H, Willner H, Oberhammer H, Peterson KA, Francisco JS. Molecular Structure, Spectroscopy and Matrix Photochemistry of Fluorocarbonyl Iodide, FC(O)I. Chemistry 2004; 10:917-24. [PMID: 14978817 DOI: 10.1002/chem.200305506] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The molecular structure of FC(O)I has been determined by gas electron diffraction. High-level ab initio methods, including coupled-cluster and the new correlation-consistent basis sets for fourth row elements, have been used to calculate the structure of FC(O)I. A comprehensive vibrational spectroscopic study (both IR and Raman) complemented by high-level calculations has also been performed. Furthermore, UV, mass, and NMR spectra have been recorded for FC(O)I. The matrix photochemistry of FC(O)I has been studied with a low-pressure mercury lamp and with a high-pressure xenon lamp in combination with interference and cut-off filters. UV photolysis revealed the formation of the OC. IF and OC.FI complexes and further photolysis of these complexes at lambda>320 nm resulted in a re-formation of FC(O)I. The structural conformation of the complexes has been characterized by comparing shifts in their CO and IF vibrational modes with respect to those of the free species. The structures, vibrational properties, and stability of the complexes were analyzed with the aid of coupled-cluster ab initio calculations.
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Affiliation(s)
- M S Chiappero
- INFIQC (Departamento de Físico Química), Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina.
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14
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Affiliation(s)
- C E Miller
- Department of Chemistry, Haverford College Haverford, Pennsylvania 19041-1392, USA
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15
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Liu Q, Schurter LM, Muller CE, Aloisio S, Francisco JS, Margerum DW. Kinetics and mechanisms of aqueous ozone reactions with bromide, sulfite, hydrogen sulfite, iodide, and nitrite ions. Inorg Chem 2001; 40:4436-42. [PMID: 11487352 DOI: 10.1021/ic000919j] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reactions of ozone with Br(-), SO(3)(2-), HSO(3)(-), I(-), and NO(2)(-), studied by stopped-flow and pulsed-accelerated-flow techniques, are first order in the concentration of O(3)(aq) and first order in the concentration of each anion. The rate constants increase by a factor of 5 x 10(6) as the nucleophilicities of the anions increase from Br(-) to SO(3)(2-). Ozone adducts with the nucleophiles are proposed as steady-state intermediates prior to oxygen atom transfer with release of O(2). Ab initio calculations show possible structures for the intermediates. The reaction between Br(-) and O(3) is accelerated by H(+) but exhibits a kinetic saturation effect as the acidity increases. The kinetics indicate formation of BrOOO(-) as a steady-state intermediate with an acid-assisted step to give BrOH and O(2). Temperature dependencies of the reactions of Br(-) and HSO(3)(-) with O(3) in acidic solutions are determined from 1 to 25 degrees C. These kinetics are important in studies of annual ozone depletion in the Arctic troposphere at polar sunrise.
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Affiliation(s)
- Q Liu
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-1393, USA
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Gerstell MF, Francisco JS, Yung YL, Boxe C, Aaltonee ET. Keeping Mars warm with new super greenhouse gases. Proc Natl Acad Sci U S A 2001; 98:2154-7. [PMID: 11226208 PMCID: PMC30108 DOI: 10.1073/pnas.051511598] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2000] [Indexed: 11/18/2022] Open
Abstract
Our selection of new super greenhouse gases to fill a putative "window" in a future Martian atmosphere relies on quantum-mechanical calculations. Our study indicates that if Mars could somehow acquire an Earth-like atmospheric composition and surface pressure, then an Earth-like temperature could be sustained by a mixture of five to seven fluorine compounds. Martian mining requirements for replenishing the fluorine could be comparable to current terrestrial extraction.
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Affiliation(s)
- M F Gerstell
- Division of Geological and Planetary Sciences, MS 150-21, California Institute of Technology, Pasadena, CA 91125, USA
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Abstract
In the atmosphere, many chemical processes are controlled by open-shell radical species. While these species are present in relatively small number densities, they initiate many of the cycles that control the chemistry of the atmosphere. The purpose of this Account is to examine recent studies of radical-water complexes that are composed of atmospherically important species. We hope this Account will provide a report on the status of this topical field, while encouraging new research directions.
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Affiliation(s)
- S Aloisio
- Departments of Chemistry and Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907-1393, USA
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18
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Abstract
The rate of oxidation of ClO2- by HOCl is first order in each reactant and is general-acid catalyzed. In the initial steps of the proposed mechanism, a steady-state intermediate, HOClOClO-, forms (k1 = 1.6 M-1 s-1) and undergoes general-acid (HA)-catalyzed reactions (k2HA) to generate a metastable intermediate, ClOClO. Values of k2HA/k-1 are 1.6 x 10(4) M-1 (H3O+), 20 M-1 (HOAc), and 8.5 M-1 (H2PO4-). Subsequent competitive reactions of ClOClO with ClO2- (k3) to give 2ClO2 and with OH- (k4OH) and other bases (k5B) to give ClO3- are very rapid. The relative yields of these products give k4OH/k3 = 1.3 x 10(5), k5HPO4/k3 = 0.20, and k5OAc/k3 = 0.06. At low pH and low buffer concentrations, the apparent yield of ClO2, based on 2ClO2 per initial HOCl, reaches 140%. This anomaly is attributed to the induced disproportionation of ClO2- by ClOClO to give ClO3- and additional HOCl. A highly reactive intermediate, ClOCl(O)OClO-, is proposed that can undergo Cl-O bond cleavage to give 2ClO2 + Cl- via one path and ClO3- + 2HOCl via another path. The additional HOCl recycles in the presence of excess ClO2- to give more ClO2. Ab initio calculations show feasible structures for the proposed reaction intermediates. Acetic acid has a second catalytic role through the formation of acetyl hypochlorite, which is much more reactive than HOCl in the transfer of Cl+ to ClO2- to form ClOClO.
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Affiliation(s)
- Z Jia
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA
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