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Fernández-Fariña S, Velo-Heleno I, Rodríguez-Silva L, Maneiro M, González-Noya AM, Pedrido R. A Dinuclear Copper(II) Complex Electrochemically Obtained via the Endogenous Hydroxylation of a Carbamate Schiff Base Ligand: Synthesis, Structure and Catalase Activity. Int J Mol Sci 2024; 25:2154. [PMID: 38396831 PMCID: PMC10889102 DOI: 10.3390/ijms25042154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 02/01/2024] [Accepted: 02/09/2024] [Indexed: 02/25/2024] Open
Abstract
In the present work, we report a neutral dinuclear copper(II) complex, [Cu2(L1)(OH)], derived from a new [N,O] donor Schiff base ligand L1 that was formed after the endogenous hydroxylation of an initial carbamate Schiff base H2L coordinated with copper ions in an electrochemical cell. The copper(II) complex has been fully characterized using different techniques, including X-ray diffraction. Direct current (DC) magnetic susceptibility measurements were also performed at variable temperatures, showing evidence of antiferromagnetic behavior. Its catalase-like activity was also tested, demonstrating that this activity is affected by temperature.
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Affiliation(s)
- Sandra Fernández-Fariña
- Departamento de Química Inorgánica, Facultade de Ciencias, Campus Terra, Universidade de Santiago de Compostela, 27002 Lugo, Spain; (S.F.-F.) (L.R.-S.); (M.M.)
| | - Isabel Velo-Heleno
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain; (I.V.-H.); (A.M.G.-N.)
| | - Laura Rodríguez-Silva
- Departamento de Química Inorgánica, Facultade de Ciencias, Campus Terra, Universidade de Santiago de Compostela, 27002 Lugo, Spain; (S.F.-F.) (L.R.-S.); (M.M.)
| | - Marcelino Maneiro
- Departamento de Química Inorgánica, Facultade de Ciencias, Campus Terra, Universidade de Santiago de Compostela, 27002 Lugo, Spain; (S.F.-F.) (L.R.-S.); (M.M.)
| | - Ana M. González-Noya
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain; (I.V.-H.); (A.M.G.-N.)
| | - Rosa Pedrido
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain; (I.V.-H.); (A.M.G.-N.)
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Improvement of Peptidyl Copper Complexes Mimicking Catalase: A Subtle Balance between Thermodynamic Stability and Resistance towards H2O2 Degradation. Molecules 2022; 27:molecules27175476. [PMID: 36080244 PMCID: PMC9457919 DOI: 10.3390/molecules27175476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/14/2022] [Accepted: 08/22/2022] [Indexed: 11/16/2022] Open
Abstract
Catalase mimics are low molecular weight metal complexes that reproduce the activity of catalase, an antioxidant metalloprotein that participates in the cellular regulation of H2O2 concentration by catalyzing its dismutation. H2O2 is a reactive oxygen species that is vital for the normal functioning of cells. However, its overproduction contributes to oxidative stress, which damages cells. Owing to their biocompatibility, peptidyl complexes are an attractive option for clinical applications to regulate H2O2 by enzyme mimics. We report here the synthesis and characterization of four new peptidyl di-copper complexes bearing two coordinating sequences. Characterization of the complexes showed that, depending on the linker used between the two coordinating sequences, their catalytic activity for H2O2 dismutation, their thermodynamic stability and their resistance to H2O2 degradation are very different, with (CATm2)Cu2 being the most promising catalyst.
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Coulibaly K, Thauvin M, Melenbacher A, Testard C, Trigoni E, Vincent A, Stillman MJ, Vriz S, Policar C, Delsuc N. A di-Copper Peptidyl Complex Mimics the Activity of Catalase, a Key Antioxidant Metalloenzyme. Inorg Chem 2021; 60:9309-9319. [PMID: 34109781 DOI: 10.1021/acs.inorgchem.0c03718] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Catalases (CAT) are antioxidant metalloenzymes necessary for life in oxygen-metabolizing cells to regulate H2O2 concentration by accelerating its dismutation. Many physiopathological situations are associated with oxidative stress resulting from H2O2 overproduction, during which antioxidant defenses are overwhelmed. We have used a combinatorial approach associated with an activity-based screening to discover a first peptidyl di-copper complex mimicking CAT. The complex was studied in detail and characterized for its CAT activity both in solutions and in cells using different analytical methods. The complex exhibited CAT activity in solutions and, more interestingly, on HyPer HeLa cells that possess a genetically encoded ratiometric fluorescent sensors of H2O2. These results highlight the efficiency of a combinatorial approach for the discovery of peptidyl complexes that exhibit catalytic activity.
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Affiliation(s)
- Koudedja Coulibaly
- Laboratoire des biomolécules, LBM, Département de chimie, Ecole normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Marion Thauvin
- Collège de France, Centre Interdisciplinaire de Recherche en Biologie (CIRB), CNRS UMR7241/INSERM U1050, 75231 Paris, Cedex 05, France.,Sorbonne Université, 4 place Jussieu, 75005 Paris, France
| | - Adyn Melenbacher
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada
| | - Clara Testard
- Laboratoire des biomolécules, LBM, Département de chimie, Ecole normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Evangelia Trigoni
- Laboratoire des biomolécules, LBM, Département de chimie, Ecole normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Amandine Vincent
- Laboratoire des biomolécules, LBM, Département de chimie, Ecole normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Martin J Stillman
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada
| | - Sophie Vriz
- Collège de France, Centre Interdisciplinaire de Recherche en Biologie (CIRB), CNRS UMR7241/INSERM U1050, 75231 Paris, Cedex 05, France.,Faculty of Science, Université de Paris, 75006 Paris, France
| | - Clotilde Policar
- Laboratoire des biomolécules, LBM, Département de chimie, Ecole normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
| | - Nicolas Delsuc
- Laboratoire des biomolécules, LBM, Département de chimie, Ecole normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France
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da Silva TU, Pougy KDC, da Silva ET, Lima CHDS, Machado SDP. Electronic investigation of the effect of substituents on the SOD mimic activity of copper (II) complexes with 8-hydroxyquinoline-derived ligands. J Inorg Biochem 2021; 217:111359. [PMID: 33578252 DOI: 10.1016/j.jinorgbio.2021.111359] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 01/16/2021] [Accepted: 01/17/2021] [Indexed: 02/04/2023]
Abstract
Density functional theory (DFT) calculations were used to study the superoxide dismutase (SOD) mimic activity of two Cu2+ complexes with ligands derived from 8-hydroxyquinoline (8-HQ). Electron-donating and -withdrawing substituent groups were inserted into the structures to verify changes in the reactivity. The theoretical parameters obtained were compared and validated with the experimental data available. The results showed that the reduction process occurs with greater participation of the 8-HQ ligand and the oxidation step occurs with participation of the copper atom in the complexes, where the electron received during the reduction step is used to reduce the Cu2+ to Cu+. The calculated electronic affinity showed good correlation with the experimental mimetic activity, and the analysis of this property, of total charge and of molecular orbitals indicated an increase in the mimetic activity with the insertion of electron-withdrawing substituent groups in the structures.
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Affiliation(s)
- Talis Uelisson da Silva
- Instituto de Química, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, Brazil.
| | - Karina de Carvalho Pougy
- Instituto de Química, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, Brazil
| | - Everton Tomaz da Silva
- Instituto de Química, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, Brazil; Instituto Federal do Rio de Janeiro, 25050-100 Caxias, RJ, Brazil
| | | | - Sérgio de Paula Machado
- Instituto de Química, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, Brazil
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