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Taras-Goslinska K, Vetica F, Barata-Vallejo S, Triantakostanti V, Marciniak B, Chatgilialoglu C. Converging Fate of the Oxidation and Reduction of 8-Thioguanosine. Molecules 2019; 24:E3143. [PMID: 31470553 PMCID: PMC6749358 DOI: 10.3390/molecules24173143] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 08/27/2019] [Accepted: 08/28/2019] [Indexed: 11/16/2022] Open
Abstract
Thione-containing nucleobases have attracted the attention of the scientific community for their application in oncology, virology, and transplantology. The detailed understanding of the reactivity of the purine derivative 8-thioguanosine (8-TG) with reactive oxygen species (ROS) and free radicals is crucial for its biological relevance. An extensive investigation on the fate of 8-TG under both reductive and oxidative conditions is here reported, and it was tested by employing steady-state photooxidation, laser flash photolysis, as well as γ-radiolysis in aqueous solutions. The characterization of the 8-TG T1 excited state by laser flash photolysis and the photooxidation experiments confirmed that singlet oxygen is a crucial intermediate in the formation of the unexpected reduced product guanosine, without the formation of the usual oxygenated sulfinic or sulfonic acids. Furthermore, a thorough screening of different radiolytic conditions upon γ-radiation afforded the reduced product. These results were rationalized by performing control experiments in the predominant presence of each reactive species formed by radiolysis of water, and the mechanistic pathway scenario was postulated on these bases.
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Affiliation(s)
| | - Fabrizio Vetica
- R&D Laboratory, Lipinutragen srl, Via Piero Gobetti 101, 40129 Bologna, Italy
- ISOF, Consiglio Nazionale delle Ricerche, Via Piero Gobetti 101, 40129 Bologna, Italy
| | - Sebastián Barata-Vallejo
- ISOF, Consiglio Nazionale delle Ricerche, Via Piero Gobetti 101, 40129 Bologna, Italy
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquimíca, Departamento de Quimíca Organíca, Junin 954, RA-1113 Buenos Aires, Argentina
| | | | - Bronisław Marciniak
- Adam Mickiewicz University, Faculty of Chemistry, Wieniawskiego 1, 61-712 Poznań, Poland
- Center of Advanced Technologies, Adam Mickiewicz University, 61-712 Poznań, Poland
| | - Chryssostomos Chatgilialoglu
- R&D Laboratory, Lipinutragen srl, Via Piero Gobetti 101, 40129 Bologna, Italy.
- ISOF, Consiglio Nazionale delle Ricerche, Via Piero Gobetti 101, 40129 Bologna, Italy.
- Center of Advanced Technologies, Adam Mickiewicz University, 61-712 Poznań, Poland.
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Kabanda MM, Serobatse KRN. A DFT study on the addition and abstraction reactions of thiourea with hydroxyl radical. J Sulphur Chem 2017. [DOI: 10.1080/17415993.2017.1359269] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Mwadham. M. Kabanda
- Department of Chemistry, Faculty of Agriculture, Science and Technology, North-West University, Mmabatho, South Africa
- Material Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Agriculture, Science and Technology, North-West University, Mmabatho, South Africa
| | - Kemoabetswe R. N. Serobatse
- Department of Chemistry, Faculty of Agriculture, Science and Technology, North-West University, Mmabatho, South Africa
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Serobatse KR, Kabanda MM. An appraisal of the hydrogen atom transfer mechanism for the reaction between thiourea derivatives and OH radical: A case-study of dimethylthiourea and diethylthiourea. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2016.12.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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