1
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Debia NP, Muller JM, Gonçalves PFB, Rodembusch FS, Lüdtke DS. Effective enantioselective recognition by steady-state fluorescence spectroscopy: Towards a paradigm shift to optical sensors with unusual chemical architecture. Spectrochim Acta A Mol Biomol Spectrosc 2023; 294:122526. [PMID: 36868019 DOI: 10.1016/j.saa.2023.122526] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 02/17/2023] [Accepted: 02/18/2023] [Indexed: 06/18/2023]
Abstract
A series of amino acid-derived 1,2,3-triazoles presenting the amino acid residue and the benzazole fluorophore connected by a triazole-4-carboxylate spacer was studied for enantioselective recognition using only steady-state fluorescence spectroscopy in solution. In this investigation, the optical sensing was performed with D-(-) and L-(+)-Arabinose and (R)-(-) and (S)-(+)-Mandelic acid as chiral analytes. The optical sensors showed specific interactions with each pair of enantiomers, allowing photophysical responses, which were used for their enantioselective recognition. DFT calculations confirm the specific interaction between the fluorophores and the analytes corroborating the observed high enantioselectivity of these compounds with the studied enantiomers. Finally, this study investigated nontrivial sensors for chiral molecules by a mechanism different than turn-on fluorescence and has the potential to broad chiral compounds with fluorophoric units as optical sensors for enantioselective sensing.
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Affiliation(s)
- Natalí P Debia
- Instituto de Química, Universidade Federal do Rio Grande do Sul - UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil
| | - Jenifer M Muller
- Instituto de Química, Universidade Federal do Rio Grande do Sul - UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil
| | - Paulo F B Gonçalves
- Instituto de Química, Universidade Federal do Rio Grande do Sul - UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil
| | - Fabiano S Rodembusch
- Instituto de Química, Universidade Federal do Rio Grande do Sul - UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil.
| | - Diogo S Lüdtke
- Instituto de Química, Universidade Federal do Rio Grande do Sul - UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil.
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2
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Coelho FL, Gil ES, Gonçalves PFB, Campo LF, Schneider PH. Intramolecular Hydroamination of Selenoalkynes to 2‐Selenylindoles in the Absence of Catalyst. Chemistry 2019; 25:8157-8162. [DOI: 10.1002/chem.201901667] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Indexed: 12/13/2022]
Affiliation(s)
- Felipe L. Coelho
- Instituto de QuímicaUniversidade Federal do Rio Grande do Sul (UFRGS), PO Box 15003 91501-970 Porto Alegre RS Brazil
| | - Eduarda S. Gil
- Instituto de QuímicaUniversidade Federal do Rio Grande do Sul (UFRGS), PO Box 15003 91501-970 Porto Alegre RS Brazil
| | - Paulo F. B. Gonçalves
- Instituto de QuímicaUniversidade Federal do Rio Grande do Sul (UFRGS), PO Box 15003 91501-970 Porto Alegre RS Brazil
| | - Leandra F. Campo
- Instituto de QuímicaUniversidade Federal do Rio Grande do Sul (UFRGS), PO Box 15003 91501-970 Porto Alegre RS Brazil
| | - Paulo H. Schneider
- Instituto de QuímicaUniversidade Federal do Rio Grande do Sul (UFRGS), PO Box 15003 91501-970 Porto Alegre RS Brazil
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3
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Kroetz T, dos Santos MC, Beal R, Zanotto GM, Santos FS, Giacomelli FC, Gonçalves PFB, de Lima VR, Dal-Bó AG, Rodembusch FS. Proton transfer in fluorescent secondary amines: synthesis, photophysics, theoretical calculation and preparation of photoactive phosphatidylcholine-based liposomes. Photochem Photobiol Sci 2019; 18:1171-1184. [DOI: 10.1039/c9pp00017h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [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
New proton-transfer lipophilic based benzazoles.
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Affiliation(s)
- Thais Kroetz
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- CEP 91501-970 Porto Alegre-RS
- Brazil
| | | | - Roiney Beal
- Grupo de Química Teórica
- Instituto de Química
- Universidade Federal do Rio Grande do Sul
- Porto Alegre-RS
- Brazil
| | - Gabriel Modernell Zanotto
- Grupo de Química Teórica
- Instituto de Química
- Universidade Federal do Rio Grande do Sul
- Porto Alegre-RS
- Brazil
| | | | | | - Paulo F. B. Gonçalves
- Grupo de Química Teórica
- Instituto de Química
- Universidade Federal do Rio Grande do Sul
- Porto Alegre-RS
- Brazil
| | | | | | - Fabiano S. Rodembusch
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- CEP 91501-970 Porto Alegre-RS
- Brazil
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4
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Gil ES, de Araújo BB, Gonçalves PFB. CASPT2, CASSCF and non-adiabatic molecular dynamics (NAMD) studies on the low-lying electronic states of 1 H-1,2,3-triazole photolysis. Phys Chem Chem Phys 2019; 21:25809-25819. [DOI: 10.1039/c9cp04313f] [Citation(s) in RCA: 2] [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: 12/22/2022]
Abstract
The photolysis mechanisms of 1H-1,2,3-triazole and 1H-1,2,3-benzotriazole were elucidated by employing multiconfigurational methods (CASSCF and CASPT2) and non-adiabatic molecular dynamics.
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Affiliation(s)
- Eduarda Sangiogo Gil
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre
- Brazil
| | - Bruno Bercini de Araújo
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre
- Brazil
| | - Paulo F. B. Gonçalves
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre
- Brazil
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5
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Debia NP, Saraiva MT, Martins BS, Beal R, Gonçalves PFB, Rodembusch FS, Alves D, Lüdtke DS. Synthesis of Amino Acid-Derived 1,2,3-Triazoles: Development of a Nontrivial Fluorescent Sensor in Solution for the Enantioselective Sensing of a Carbohydrate and Bovine Serum Albumin Interaction. J Org Chem 2018; 83:1348-1357. [PMID: 29313350 DOI: 10.1021/acs.joc.7b02852] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A series of amino acid-derived 1,2,3-triazoles presenting the amino acid and the aromatic moieties connected by a triazole-4-carboxylate spacer is discussed in this work. These compounds were achieved in good yields by organocatalytic enamine-azide [3 + 2] cycloadditions. One of the molecules obtained, bearing a 7-chloroquinoline moiety, was photoactive in the UV-violet region and was successfully employed as a probe for substrate-specific enantiomeric sensing using d-(-)-arabinose and l-(+)-arabinose. The potential application as a fluorescent probe to detect protein in phosphate buffer solution was also explored using as model bovine serum albumin (BSA). The studied compounds presented both suppression and association behavior in the presence of BSA. In addition, theoretical calculations were performed at levels ωB97XD/cc-pVDZ and PBE1PBE/6-311+G(d,p) together with the polarizable continuum model to understand the interaction of the molecules with the enantiomers.
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Affiliation(s)
- Natalí P Debia
- Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS , Av. Bento Gonçalves 9500, Porto Alegre, RS 91501-970, Brazil
| | - Maiara T Saraiva
- LASOL-CCQFA, Universidade Federal de Pelotas-UFPEL , Pelotas, RS 96010-610, Brazil
| | - Bruna S Martins
- Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS , Av. Bento Gonçalves 9500, Porto Alegre, RS 91501-970, Brazil
| | - Roiney Beal
- Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul-UFRGS , Porto Alegre, RS 90040-060, Brazil
| | - Paulo F B Gonçalves
- Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul-UFRGS , Porto Alegre, RS 90040-060, Brazil
| | - Fabiano S Rodembusch
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada, Universidade Federal do Rio Grande do Sul - UFRGS , Porto Alegre, RS 90040-060, Brazil
| | - Diego Alves
- LASOL-CCQFA, Universidade Federal de Pelotas-UFPEL , Pelotas, RS 96010-610, Brazil
| | - Diogo S Lüdtke
- Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS , Av. Bento Gonçalves 9500, Porto Alegre, RS 91501-970, Brazil
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6
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Monçalves M, Zanotto GM, Toldo JM, Rampon DS, Schneider PH, Gonçalves PFB, Rodembusch FS, Silveira CC. Correction: Dipolar vinyl sulfur fluorescent dyes. Synthesis and photophysics of sulfide, sulfoxide and sulfone based D–π–A compounds. RSC Adv 2018; 8:5372. [PMID: 35544424 PMCID: PMC9078179 DOI: 10.1039/c8ra90006j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 01/18/2018] [Indexed: 11/21/2022] Open
Abstract
Correction for ‘Dipolar vinyl sulfur fluorescent dyes. Synthesis and photophysics of sulfide, sulfoxide and sulfone based D–π–A compounds’ by Matias Monçalves et al., RSC Adv., 2017, 7, 8832–8842.
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Affiliation(s)
- Matias Monçalves
- Departamento de Química
- Universidade Federal de Santa Maria
- Santa Maria-RS
- Brazil
| | - Gabriel M. Zanotto
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Josene M. Toldo
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Daniel S. Rampon
- Universidade Federal do Paraná
- Departamento de Química
- Laboratório de Polímeros e Catálise
- Curitiba
- Brazil
| | - Paulo H. Schneider
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Paulo F. B. Gonçalves
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Fabiano S. Rodembusch
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Claudio C. Silveira
- Departamento de Química
- Universidade Federal de Santa Maria
- Santa Maria-RS
- Brazil
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7
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Abstract
Photo-Fries rearrangement plays a central role in synthesis, but it is still unclear how it works. A three-state model can explain it.
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Affiliation(s)
- Josene M. Toldo
- Department of Physical Chemistry
- Federal University of Rio Grande do Sul
- Porto Alegre-RS
- Brazil
- Aix Marseille Univ
| | | | - Paulo F. B. Gonçalves
- Department of Physical Chemistry
- Federal University of Rio Grande do Sul
- Porto Alegre-RS
- Brazil
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8
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Monçalves M, Zanotto GM, Toldo JM, Rampon DS, Schneider PH, Gonçalves PFB, Rodembusch FS, Silveira CC. Dipolar vinyl sulfur fluorescent dyes. Synthesis and photophysics of sulfide, sulfoxide and sulfone based D–π–A compounds. RSC Adv 2017. [DOI: 10.1039/c6ra27989a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
New vinyl sulfides and sulfoxides were obtained in good yields using the Horner–Wadsworth–Emmons (HWE) reaction.
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Affiliation(s)
- Matias Monçalves
- Departamento de Química
- Universidade Federal de Santa Maria
- Santa Maria-RS
- Brazil
| | - Gabriel M. Zanotto
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Josene M. Toldo
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Daniel S. Rampon
- Universidade Federal do Paraná
- Departamento de Química
- Laboratório de Polímeros e Catálise
- Curitiba
- Brazil
| | - Paulo H. Schneider
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Paulo F. B. Gonçalves
- Grupo de Química Teórica
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Fabiano S. Rodembusch
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre-RS
- Brazil
| | - Claudio C. Silveira
- Departamento de Química
- Universidade Federal de Santa Maria
- Santa Maria-RS
- Brazil
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9
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Toldo JM, Merlo AA, Gonçalves PFB. The 1,3-Dipolar Cycloaddition of Nitrile Oxide to Vinylacetic Acid: Computational Study of Transition States Selectivity, Solvent Effects, and Bicyclo Formation. J BRAZIL CHEM SOC 2016. [DOI: 10.5935/0103-5053.20160016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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10
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Tavares A, Toldo JM, Vilela GD, Gonçalves PFB, Bechtold IH, Kitney SP, Kelly SM, Merlo AA. Implications of flexible spacer rotational processes on the liquid crystal behavior of 4,5-dihydroisoxazole benzoate dimers. NEW J CHEM 2016. [DOI: 10.1039/c5nj02199e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Liquid crystals behavior of the 5a–d and 9a–d was dictated by rotational aspects of the flexible spacer.
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11
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Balaguez RA, Ricordi VG, Duarte RC, Toldo JM, Santos CM, Schneider PH, Gonçalves PFB, Rodembusch FS, Alves D. Bis-arylsulfenyl- and bis-arylselanyl-benzo-2,1,3-thiadiazoles: synthesis and photophysical characterization. RSC Adv 2016. [DOI: 10.1039/c6ra04157d] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Bis-arylsulfenyl- and bis-arylselanyl-benzo-2,1,3-thiadiazoles were synthesized in good yields by copper-catalysed cross-coupling reaction of arylthiols or diaryl diselenides with the commercially available 4,7-dibromobenzo[c][1,2,5]thiadiazole.
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Affiliation(s)
- Renata A. Balaguez
- Laboratório de Síntese Orgânica Limpa
- Universidade Federal de Pelotas – UFPel
- Pelotas
- Brazil
| | - Vanessa G. Ricordi
- Laboratório de Síntese Orgânica Limpa
- Universidade Federal de Pelotas – UFPel
- Pelotas
- Brazil
| | - Rodrigo C. Duarte
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre
- Brazil
| | - Josene M. Toldo
- Grupo de Química Teórica e Computacional
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre
- Brazil
| | - Cristtofer M. Santos
- Grupo de Química Teórica e Computacional
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre
- Brazil
| | - Paulo H. Schneider
- Universidade Federal do Rio Grande do Sul
- Instituto de Química
- Departamento de Química Orgânica
- Porto Alegre
- Brazil
| | - Paulo F. B. Gonçalves
- Grupo de Química Teórica e Computacional
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre
- Brazil
| | - Fabiano S. Rodembusch
- Grupo de Pesquisa em Fotoquímica Orgânica Aplicada
- Universidade Federal do Rio Grande do Sul – Instituto de Química
- Porto Alegre
- Brazil
| | - Diego Alves
- Laboratório de Síntese Orgânica Limpa
- Universidade Federal de Pelotas – UFPel
- Pelotas
- Brazil
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12
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Marmitt S, Gonçalves PFB. A DFT study on the insertion of CO2into styrene oxide catalyzed by 1-butyl-3-methyl-Imidazolium bromide ionic liquid. J Comput Chem 2015; 36:1322-33. [DOI: 10.1002/jcc.23930] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 04/03/2015] [Accepted: 04/04/2015] [Indexed: 01/05/2023]
Affiliation(s)
- Sandro Marmitt
- Theoretical Chemistry Group; Institute of Chemistry; UFRGS, Av. Bento Gonçalves, 9500 Porto Alegre 91501-970 RS Brazil
| | - Paulo F. B. Gonçalves
- Theoretical Chemistry Group; Institute of Chemistry; UFRGS, Av. Bento Gonçalves, 9500 Porto Alegre 91501-970 RS Brazil
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13
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Santos FS, Costa TMH, Stefani V, Gonçalves PFB, Descalzo RR, Benvenutti EV, Rodembusch FS. Synthesis, Characterization, and Spectroscopic Investigation of Benzoxazole Conjugated Schiff Bases. J Phys Chem A 2011; 115:13390-8. [DOI: 10.1021/jp206905f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fabiano S. Santos
- Laboratório de Sólidos e Superfícies, ‡Laboratório de Novos Materiais Orgânicos, and §Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul - Instituto de Química, Avenida Bento Gonçalves, 9500, CP 15003, CEP 91501-970 Porto Alegre-RS, Brazil
| | - Tania M. H. Costa
- Laboratório de Sólidos e Superfícies, ‡Laboratório de Novos Materiais Orgânicos, and §Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul - Instituto de Química, Avenida Bento Gonçalves, 9500, CP 15003, CEP 91501-970 Porto Alegre-RS, Brazil
| | - Valter Stefani
- Laboratório de Sólidos e Superfícies, ‡Laboratório de Novos Materiais Orgânicos, and §Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul - Instituto de Química, Avenida Bento Gonçalves, 9500, CP 15003, CEP 91501-970 Porto Alegre-RS, Brazil
| | - Paulo F. B. Gonçalves
- Laboratório de Sólidos e Superfícies, ‡Laboratório de Novos Materiais Orgânicos, and §Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul - Instituto de Química, Avenida Bento Gonçalves, 9500, CP 15003, CEP 91501-970 Porto Alegre-RS, Brazil
| | - Rodrigo R. Descalzo
- Laboratório de Sólidos e Superfícies, ‡Laboratório de Novos Materiais Orgânicos, and §Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul - Instituto de Química, Avenida Bento Gonçalves, 9500, CP 15003, CEP 91501-970 Porto Alegre-RS, Brazil
| | - Edilson V. Benvenutti
- Laboratório de Sólidos e Superfícies, ‡Laboratório de Novos Materiais Orgânicos, and §Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul - Instituto de Química, Avenida Bento Gonçalves, 9500, CP 15003, CEP 91501-970 Porto Alegre-RS, Brazil
| | - Fabiano S. Rodembusch
- Laboratório de Sólidos e Superfícies, ‡Laboratório de Novos Materiais Orgânicos, and §Grupo de Química Teórica e Computacional, Universidade Federal do Rio Grande do Sul - Instituto de Química, Avenida Bento Gonçalves, 9500, CP 15003, CEP 91501-970 Porto Alegre-RS, Brazil
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14
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Rampon DS, Rodembusch FS, Schneider JMFM, Bechtold IH, Gonçalves PFB, Merlo AA, Schneider PH. Novel selenoesters fluorescent liquid crystalline exhibiting a rich phase polymorphism. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b917366h] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Tavares A, Livotto PR, Gonçalves PFB, Merlo AA. 3-Arylisoxazolyl-5-carboxylic acid and 5-(Hydroxymethyl)-3-aryl-2-isoxazoline as molecular platforms for liquid-crystalline materials. J BRAZIL CHEM SOC 2009. [DOI: 10.1590/s0103-50532009000900025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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16
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Monteiro KM, Scapin SMN, Navarro MVAS, Zanchin NIT, Cardoso MB, da Silveira NP, Gonçalves PFB, Stassen HK, Zaha A, Ferreira HB. Self-assembly and structural characterization of Echinococcus granulosus antigen B recombinant subunit oligomers. Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics 2007; 1774:278-85. [PMID: 17188949 DOI: 10.1016/j.bbapap.2006.11.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2006] [Revised: 11/07/2006] [Accepted: 11/08/2006] [Indexed: 11/25/2022]
Abstract
Echinococcus granulosus antigen B is an oligomeric protein of 120-160 kDa composed by 8-kDa (AgB8) subunits. Here, we demonstrated that the AgB8 recombinant subunits AgB8/1, AgB8/2 and AgB8/3 are able to self-associate into high order homo-oligomers, showing similar properties to that of parasite-produced AgB, making them valuable tools to study AgB structure. Dynamic light scattering, size exclusion chromatography and cross-linking assays revealed approximately 120- to 160-kDa recombinant oligomers, with a tendency to form populations with different aggregation states. Recombinant oligomers showed helical circular dichroism spectra and thermostability similar to those of purified AgB. Cross-linking and limited proteolysis experiments indicated different degrees of stability and compactness between the recombinant oligomers, with the AgB8/3 one showing a more stable and compact structure. We have also built AgB8 subunit structural models in order to predict the surfaces possibly involved in electrostatic and hydrophobic interactions during oligomerization.
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Affiliation(s)
- Karina M Monteiro
- Laboratório de Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Cx. Postal 15005, 91501-970, Porto Alegre, RS, Brazil
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17
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Abstract
Using molecular dynamics simulation, we present new results for the free energy of solvation for solvents with low dielectric constants (CCl(4), CHCl(3), benzene). The solvation free energy is computed as the sum of three contributions originated at the cavitation of the solute by the solvent, the solute-solvent repulsion and dispersion interactions, and the electrostatic solvation of the solute. The cavitational contribution has been obtained from the Claverie-Pierotti model applied to excluded volumes obtained from distances for nearest neighbor configurations between the solute's atoms and a spherical solvent description. An electrostatic continuum model has been adapted for the computation of the electrostatic free energy of solvation, whereas the van der Waals contribution has been calculated directly from the intermolecular interactions defined by the force fields applied to the simulations. For each solvent, a large set of solute molecules containing most of the chemically interesting functionalities has been treated. The simulated solvation free energies are in very good agreement with experimental data, although a small systematical overestimation of the free energy of solvation indicates a failure of the spherical approach to the solvent molecules in the case of benzene.
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Affiliation(s)
- Paulo F B Gonçalves
- Grupo de Química Teórica, Instituto de Química, Universidade Federal do Rio Grande do Sul, 91540-000 Porto Alegre, RS, Brazil.
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18
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Abstract
A new approach to the calculation of the free energy of solvation from trajectories obtained by molecular dynamics simulation is presented. The free energy of solvation is computed as the sum of three contributions originated at the cavitation of the solute by the solvent, the solute-solvent nonpolar (repulsion and dispersion) interactions, and the electrostatic solvation of the solute. The electrostatic term is calculated based on ideas developed for the broadly used continuum models, the cavitational contribution from the excluded volume by the Claverie-Pierotti model, and the Van der Waals term directly from the molecular dynamics simulation. The proposed model is tested for diluted aqueous solutions of simple molecules containing a variety of chemically important functions: methanol, methylamine, water, methanethiol, and dichloromethane. These solutions were treated by molecular dynamics simulations using SPC/E water and the OPLS force field for the organic molecules. Obtained free energies of solvation are in very good agreement with experimental data.
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Affiliation(s)
- Paulo F B Gonçalves
- Grupo de Química Teórica, Instituto de Química, Universidade Federal do Rio Grande do Sul, 91540-000 Porto Alegre- RS, Brazil
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