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Dimarco Palencia FCD, Muñoz VA, Posadaz AC, Cifuente DA, Miskoski S, Ferrari GV, García NA, Montaña MP. Oregano Essential Oil Interactions with Photogenerated Singlet Molecular Oxygen. Photochem Photobiol 2020; 96:1005-1013. [DOI: 10.1111/php.13265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 02/09/2020] [Accepted: 03/16/2020] [Indexed: 11/27/2022]
Affiliation(s)
- Frida C. D. Dimarco Palencia
- Facultad de Química, Bioquímica y Farmacia Área de Química Física Instituto de Química de San Luis INQUISAL (CONICET‐UNSL) Universidad Nacional de San Luis San Luis Argentina
| | - Vanesa A. Muñoz
- Facultad de Química, Bioquímica y Farmacia Área de Química Física Instituto de Química de San Luis INQUISAL (CONICET‐UNSL) Universidad Nacional de San Luis San Luis Argentina
| | - Ariana C. Posadaz
- FTU‐UNSL Área de Formación Básica Facultad de Turismo y Urbanismo Universidad Nacional de San Luis San Luis Argentina
| | - Diego A. Cifuente
- Facultad de Química, Bioquímica y Farmacia Área de Química Orgánica Instituto de Tecnología Química INTEQUI (UNSL‐CONICET) Universidad Nacional de San Luis San Luis Argentina
| | - Sandra Miskoski
- Departamento de Química Facultad de Ciencias Exactas Físico‐Químicas y Naturales Universidad Nacional de Río Cuarto Río Cuarto Argentina
| | - Gabriela V. Ferrari
- Facultad de Química, Bioquímica y Farmacia Área de Química Física Instituto de Química de San Luis INQUISAL (CONICET‐UNSL) Universidad Nacional de San Luis San Luis Argentina
| | - Norman A. García
- Departamento de Química Facultad de Ciencias Exactas Físico‐Químicas y Naturales Universidad Nacional de Río Cuarto Río Cuarto Argentina
| | - María P. Montaña
- Facultad de Química, Bioquímica y Farmacia Área de Química Física Instituto de Química de San Luis INQUISAL (CONICET‐UNSL) Universidad Nacional de San Luis San Luis Argentina
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Fuentes-Lemus E, Mariotti M, Reyes J, Leinisch F, Hägglund P, Silva E, Davies MJ, López-Alarcón C. Photo-oxidation of lysozyme triggered by riboflavin is O 2-dependent, occurs via mixed type 1 and type 2 pathways, and results in inactivation, site-specific damage and intra- and inter-molecular crosslinks. Free Radic Biol Med 2020; 152:61-73. [PMID: 32142879 DOI: 10.1016/j.freeradbiomed.2020.03.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 02/28/2020] [Accepted: 03/02/2020] [Indexed: 12/21/2022]
Abstract
Photosensitized protein oxidation is a promising tool for medical procedures such as photochemical tissue bonding (PTB). We have recently reported that the binding of rose Bengal, a sensitizer employed in PTB, to lysozyme modulates the photooxidation and crosslinking of this protein. In this work we examined the photooxidation and crosslinking of lysozyme mediated by riboflavin (RF) an endogenous sensitizer also employed in PTB. We hypothesized that since RF does not bind strongly to proteins, the mechanism(s) and extent of enzymatic inactivation, amino acid modification and protein crosslinking would be dependent on the presence of O2, and differ to that induced by rose Bengal. This hypothesis was tested using UV-visible spectrophotometry, isothermal titration calorimetry (ITC), SDS-PAGE gels, quantification of amino acid consumption, and LC-MS analysis of sites of modification and crosslinks. Under N2, limited damage was detected arising from type 1 (radical) chemistry with formation of specific intra- (Tyr20-Tyr23) and inter- (Tyr23-Trp108) molecular crosslinks. In contrast, the presence of O2 triggered extensive protein damage through mixed type 1 and type 2 (1O2) mechanisms leading to Trp, Met, Tyr and His oxidation, loss of enzymatic activity and protein dimerization. LC-MS analysis provided evidence for crosslinking via radical-radical recombination reactions (Trp28-Tyr53), and secondary reactions involving nucleophilic attack of the side-chain amine of Lys116 on carbonyl groups. Overall, this behavior is in marked contrast to that detected with rose Bengal indicating that the mechanisms and sites of photo-oxidative damage, and consequences for protein function, can be modulated by the choice of sensitizing dye.
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Affiliation(s)
- Eduardo Fuentes-Lemus
- Pontificia Universidad Católica de Chile(,) Facultad de Química, Departamento de Química Física, Santiago, Chile
| | - Michele Mariotti
- University of Copenhagen, Department of Biomedical Sciences, Copenhagen, Denmark
| | - Juan Reyes
- Pontificia Universidad Católica de Chile(,) Facultad de Química, Departamento de Química Física, Santiago, Chile
| | - Fabian Leinisch
- University of Copenhagen, Department of Biomedical Sciences, Copenhagen, Denmark
| | - Per Hägglund
- University of Copenhagen, Department of Biomedical Sciences, Copenhagen, Denmark
| | - Eduardo Silva
- Pontificia Universidad Católica de Chile(,) Facultad de Química, Departamento de Química Física, Santiago, Chile
| | - Michael J Davies
- University of Copenhagen, Department of Biomedical Sciences, Copenhagen, Denmark.
| | - Camilo López-Alarcón
- Pontificia Universidad Católica de Chile(,) Facultad de Química, Departamento de Química Física, Santiago, Chile.
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Muñoz VA, Dimarco Palencia FCD, Sancho MI, Miskoski S, García NA, Ferrari GV, Montaña MP. Experimental and Theoretical Study of the Stability of the Complex Fisetin-Cu(II) and A Comparative Study of Free Ligand and Complex Interaction with Molecular Singlet Oxygen. Photochem Photobiol 2020; 96:815-825. [PMID: 31912514 DOI: 10.1111/php.13213] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 12/19/2019] [Indexed: 12/20/2022]
Abstract
In this work, the flavonol fisetin was selected in order to study its reactivity against Cu(II), a metal ion of interest in biological media and industry. The stoichiometry and apparent formation constant of the complex in ethanolic medium at 25°C were evaluated using spectrophotometric techniques. The resulting stoichiometry was a 1:1 ligand:metal complex, and a log K = 5.17 ± 0.12 was determined. Since two possible chelation sites can be proposed for the complex formation, quantum chemistry calculations were performed on these structures. Calculations suggest that the hydroxyl-keto site is more stable for the complex formation than the catechol site. Flavonoids could exert protection against oxidative damage caused by reactive oxygen species, and this biological activity could be affected by chelation with metal ions. This led us to perform a study on the interaction of both, free flavonoid and complex, with reactive oxygen species. Our results showed both compounds quench molecular singlet oxygen photogenerated with visible light, mainly in a physical fashion. In order to analyze a possible protective effect of flavonoid and its complex against oxidative damage in biological environments, the amino acid tryptophan was selected as a model oxidation system. Free flavonoid does not have a marked protective effect, whereas its complex showed a relevant protective effect.
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Affiliation(s)
- Vanesa A Muñoz
- Facultad de Química, Bioquímica y Farmacia, Área de Química Física, Instituto de Química de San Luis INQUISAL (CONICET-UNSL), San Luis, Argentina
| | - Frida C D Dimarco Palencia
- Facultad de Química, Bioquímica y Farmacia, Área de Química Física, Instituto de Química de San Luis INQUISAL (CONICET-UNSL), San Luis, Argentina
| | - Matias I Sancho
- Facultad de Química, Bioquímica y Farmacia, Área de Química Física, Instituto Multidisciplinario de Investigaciones Biológicas San Luis IMIBIO-SL (CONICET-UNSL), San Luis, Argentina
| | - Sandra Miskoski
- Departamento de Química, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Argentina
| | - Norman A García
- Departamento de Química, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Argentina
| | - Gabriela V Ferrari
- Facultad de Química, Bioquímica y Farmacia, Área de Química Física, Instituto de Química de San Luis INQUISAL (CONICET-UNSL), San Luis, Argentina
| | - María Paulina Montaña
- Facultad de Química, Bioquímica y Farmacia, Área de Química Física, Instituto de Química de San Luis INQUISAL (CONICET-UNSL), San Luis, Argentina
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Silva E, Barrias P, Fuentes-Lemus E, Tirapegui C, Aspee A, Carroll L, Davies MJ, López-Alarcón C. Riboflavin-induced Type 1 photo-oxidation of tryptophan using a high intensity 365 nm light emitting diode. Free Radic Biol Med 2019; 131:133-143. [PMID: 30502456 DOI: 10.1016/j.freeradbiomed.2018.11.026] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 10/03/2018] [Accepted: 11/21/2018] [Indexed: 10/27/2022]
Abstract
The mechanism of photo-oxidation of tryptophan (Trp) sensitized by riboflavin (RF) was examined employing high concentrations of Trp and RF, with a high intensity 365 nm light emitting diode (LED) source under N2, 20% and 100% O2 atmospheres. Dimerization of Trp was a major pathway under the N2 atmosphere, though this occurred with a low yield (DφTrp = 5.9 × 10-3), probably as a result of extensive back electron transfer reactions between RF•- and Trp(H)•+. The presence of O2 decreased the extent of this back electron transfer reaction, and the extent of Trp dimerization. This difference is attributed to the formation of O2•- (generated via electron transfer from RF•- to O2) which reacts rapidly with Trp• leading to extensive consumption of the parent amino acid and formation of peroxides and multiple other oxygenated products (N-formylkynurenine, alcohols, diols) of Trp, as detected by LC-MS. Thus, it appears that the first step of the Type 1 mechanism of Trp photo-oxidation, induced by this high intensity 365 nm light source, is an electron transfer reaction between the amino acid and 3RF, with the presence of O2 modulating the subsequent reactions and the products formed, as a result of O2•- formation. These data have potential biological significance as LED systems and RF-based treatments have been proposed for the treatment of pathological myopia and keratitis.
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Affiliation(s)
- Eduardo Silva
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física, Santiago, Chile.
| | - Pablo Barrias
- Universidad de Santiago de Chile, Facultad de Química y Biología, Departamento de Ciencias de los Materiales, Santiago, Chile
| | - Eduardo Fuentes-Lemus
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física, Santiago, Chile
| | - Cristian Tirapegui
- Universidad de Santiago de Chile, Facultad de Química y Biología, Departamento de Ciencias de los Materiales, Santiago, Chile
| | - Alexis Aspee
- Universidad de Santiago de Chile, Facultad de Química y Biología, Departamento de Ciencias de los Materiales, Santiago, Chile
| | - Luke Carroll
- University of Copenhagen, Department of Biomedical Sciences, Copenhagen, Denmark
| | - Michael J Davies
- University of Copenhagen, Department of Biomedical Sciences, Copenhagen, Denmark
| | - Camilo López-Alarcón
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física, Santiago, Chile.
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