1
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Martínez-Camarena Á, Bellia F, Paz Clares M, Vecchio G, Nicolas J, García-España E. Polymeric Nanozyme with SOD Activity Capable of Inhibiting Self- and Metal-Induced α-Synuclein Aggregation. Chemistry 2024; 30:e202401331. [PMID: 38687026 DOI: 10.1002/chem.202401331] [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: 04/03/2024] [Revised: 04/29/2024] [Accepted: 04/30/2024] [Indexed: 05/02/2024]
Abstract
Despite decades of research, Parkinson's disease is still an idiopathic pathology for which no cure has yet been found. This is partly explained by the multifactorial character of most neurodegenerative syndromes, whose generation involves multiple pathogenic factors. In Parkinson's disease, two of the most important ones are the aggregation of α-synuclein and oxidative stress. In this work, we address both issues by synthesizing a multifunctional nanozyme based on grafting a pyridinophane ligand that can strongly coordinate CuII, onto biodegradable PEGylated polyester nanoparticles. The resulting nanozyme exhibits remarkable superoxide dismutase activity together with the ability to inhibit the self-induced aggregation of α-synuclein into amyloid-type fibrils. Furthermore, the combination of the chelator and the polymer produces a cooperative effect whereby the resulting nanozyme can also halve CuII-induced α-synuclein aggregation.
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Affiliation(s)
- Álvaro Martínez-Camarena
- ICMol, Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
- Institut Galien Paris-Saclay, CNRS, Université Paris-Saclay, Orsay, 91400, France
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale A. Doria 6, Catania, 95125, Italy
- MatMoPol Research Group, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, Madrid, 28040, Spain
| | - Francesco Bellia
- Istituto di Cristallografia, CNR, P. Gaifami 18, Catania, 95126, Italy
| | - M Paz Clares
- ICMol, Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
| | - Graziella Vecchio
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale A. Doria 6, Catania, 95125, Italy
| | - Julien Nicolas
- Institut Galien Paris-Saclay, CNRS, Université Paris-Saclay, Orsay, 91400, France
| | - Enrique García-España
- ICMol, Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
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2
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Naher M, Su C, Harmer JR, Williams CM, Bernhardt PV. Electrocatalytic Atom Transfer Radical Addition with Turbocharged Organocopper(II) Complexes. Inorg Chem 2023; 62:15575-15583. [PMID: 37712595 DOI: 10.1021/acs.inorgchem.3c02106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
The utility and scope of Cu-catalyzed halogen atom transfer chemistry have been exploited in the fields of atom transfer radical polymerization and atom transfer radical addition, where the metal plays a key role in radical formation and minimizing unwanted side reactions. We have shown that electrochemistry can be employed to modulate the reactivity of the Cu catalyst between its active (CuI) and dormant (CuII) states in a variety of ligand systems. In this work, a macrocyclic pyridinophane ligand (L1) was utilized, which can break the C-Br bond of BrCH2CN to release •CH2CN radicals when in complex with CuI. Moreover, the [CuI(L1)]+ complex can capture the •CH2CN radical to form a new species [CuII(L1)(CH2CN)]+ in situ that, on reduction, exhibits halogen atom transfer reactivity 3 orders of magnitude greater than its parent complex [CuI(L1)]+. This unprecedented rate acceleration has been identified by electrochemistry, successfully reproduced by simulation, and exploited in a Cu-catalyzed bulk electrosynthesis where [CuII(L1)(CH2CN)]+ participates as a radical donor in the atom transfer radical addition of BrCH2CN to a selection of styrenes. The formation of these turbocharged catalysts in situ during electrosynthesis offers a new approach to the Cu-catalyzed organic reaction methodology.
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Affiliation(s)
- Masnun Naher
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
| | - Chuyi Su
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
| | - Jeffrey R Harmer
- Centre for Advanced Imaging, University of Queensland, Brisbane 4072, Australia
| | - Craig M Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
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3
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Mekhail MA, Smith KJ, Freire DM, Pota K, Nguyen N, Burnett ME, Green KN. Increased Efficiency of a Functional SOD Mimic Achieved with Pyridine Modification on a Pyclen-Based Copper(II) Complex. Inorg Chem 2023; 62:5415-5425. [PMID: 36995929 PMCID: PMC10820499 DOI: 10.1021/acs.inorgchem.2c04327] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
A series of Cu(II) complexes with the formula [CuRPyN3]2+ varying in substitution on the pyridine ring were investigated as superoxide dismutase (SOD) mimics to identify the most efficient reaction rates produced by a synthetic, water-soluble copper-based SOD mimic reported to date. The resulting Cu(II) complexes were characterized by X-ray diffraction analysis, UV-visible spectroscopy, cyclic voltammetry, and metal-binding (log β) affinities. Unique to this approach, the modifications to the pyridine ring of the PyN3 parent system tune the redox potential while exhibiting high binding stabilities without changing the coordination environment of the metal complex within the PyN3 family of ligands. We were able to adjust in parallel the binding stability and the SOD activity without compromising on either through simple modification of the pyridine ring on the ligand system. This goldilocks effect of high metal stabilities and high SOD activity reveals the potential of this system to be explored in therapeutics. These results serve as a guide for factors that can be modified in metal complexes using pyridine substitutions for PyN3, which can be incorporated into a range of applications moving forward.
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Affiliation(s)
- Magy A Mekhail
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Katherine J Smith
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - David M Freire
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Kristof Pota
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Nam Nguyen
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Marianne E Burnett
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Kayla N Green
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, United States
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4
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Mekhail MA, Pota K, Kharel S, Freire DM, Green KN. Pyridine modifications regulate the electronics and reactivity of Fe-pyridinophane complexes. Dalton Trans 2023; 52:892-901. [PMID: 36537287 PMCID: PMC10903111 DOI: 10.1039/d2dt03485a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
12-Membered pyridinophanes are the focus of many studies as biological mimics, chelators, and catalytic precursors. Therefore, the desire to tune the reactivity of pyridinophanes to better control the applications of derivative metal complexes has inspired many structure-activity relationship studies. However, the separation of structural versus electronic changes imparted by ligand modification has made these structure-activity relationship studies of transition metal catalysts challenging to define. In this work we show that 4-substitution of the pyridine ring in 12-membered tetra-aza pyridinophanes successfully provides a regulatory handle on the electronic properties of the metal center and, therefore, the catalytic C-C coupling activity of the respective iron complexes. The C-C coupling reaction catalyzed by Fe(L1-L6) provides a range of yields (32-58%) that directly correlate with iron redox potentials (ΔE1/2 = 152 mV) and metal binding constants (Δlog β = 3.45), while the geometry of the complexes was virtually indistinguishable. These are the first results to definitively show the redox potential and metal binding as independent properties from the coordination chemistry in one ligand series. Adjustments to these chemical properties were then shown to provide a regulatory handle for the C-C coupling reactivity tuned via pyridine substitution in pyridinophanes.
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Affiliation(s)
- Magy A Mekhail
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, USA.
| | - Kristof Pota
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, USA.
| | - Sugam Kharel
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, USA.
| | - David M Freire
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, USA.
| | - Kayla N Green
- Department of Chemistry and Biochemistry, Texas Christian University, Fort Worth, Texas 76129, USA.
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5
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Martínez-Camarena Á, Merino M, Sánchez-Sánchez AV, Blasco S, Llinares JM, Mullor JL, García-España E. An antioxidant boehmite amino-nanozyme able to disaggregate Huntington's inclusion bodies. Chem Commun (Camb) 2022; 58:5021-5024. [PMID: 35373809 DOI: 10.1039/d2cc01257j] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A novel amino-nanozyme, based on boehmite nanoparticles (BNPs) functionalised with a tetra-azapyridinophane (L1), has been designed to undermine some of the key issues underlying Huntington disease. L1 forms Cu2+ complexes with a striking SOD activity, while when grafted to the BNPs displays mitoROS scavenging properties and ability to disaggregate mutant huntingtin deposits in cells.
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Affiliation(s)
- Álvaro Martínez-Camarena
- ICMol, Departamento de Química Inorgánica, University of Valencia, C/Catedrático José Beltrán 2, 46980, Paterna, Spain.
| | - Marian Merino
- Bionos Biotech SL, Biopolo La Fe, IIS La Fe, Av. Fernando Abril Martorell, Torre 106 A 7 planta, 46026 València, Spain
| | - Ana Virginia Sánchez-Sánchez
- Bionos Biotech SL, Biopolo La Fe, IIS La Fe, Av. Fernando Abril Martorell, Torre 106 A 7 planta, 46026 València, Spain
| | - Salvador Blasco
- ICMol, Departamento de Química Inorgánica, University of Valencia, C/Catedrático José Beltrán 2, 46980, Paterna, Spain.
| | - José M Llinares
- Departamento de Química Orgánica, University of Valencia, C/Dr Moliner s/n, 46100, Burjassot, Spain
| | - José L Mullor
- Bionos Biotech SL, Biopolo La Fe, IIS La Fe, Av. Fernando Abril Martorell, Torre 106 A 7 planta, 46026 València, Spain
| | - Enrique García-España
- ICMol, Departamento de Química Inorgánica, University of Valencia, C/Catedrático José Beltrán 2, 46980, Paterna, Spain.
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6
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Diószegi R, Bonczidai-Kelemen D, Bényei AC, May NV, Fábián I, Lihi N. Copper(II) Complexes of Pyridine-2,6-dicarboxamide Ligands with High SOD Activity. Inorg Chem 2022; 61:2319-2332. [PMID: 35029102 DOI: 10.1021/acs.inorgchem.1c03728] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Copper(II) complexes of pyridine-based ligands functionalized with alanine (PydiAla) and tyrosine (PydiTyr) moieties have been synthesized as novel superoxide dismutase mimics. The complexes were characterized by pH-potentiometric, spectroscopic (UV-vis, circular dichroism, mass spectrometry, electron paramagnetic resonance spectroscopy), computational (DFT), and X-ray diffraction methods. Both ligands form high stability copper(II) complexes via the (Npy,N-,N-) donor set supported by the binding of the carboxylate pendant arms. Although the coordination mode is the same for the two systems, the tyrosine containing counterpart exhibits increased copper(II) binding affinity, which is most likely due to the presence of the aromatic moiety of the side chains. Both copper(II) complexes are capable of binding N-methylimidazole, and the formation of the corresponding ternary species was observed at physiological pH. The binary and ternary copper(II) complexes exhibit high SOD activity. The PydiTyr complex exhibits about 1 order of magnitude higher activity than the PydiAla complex. This is probably due to the presence of the phenolic OH group in the former species, which promotes the binding of the superoxide anion radical to the metal center. The results serve as a basis for designing highly efficient copper(II) mimics for medical and practical applications.
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Affiliation(s)
- Róbert Diószegi
- Department of Inorganic and Analytical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary.,Doctoral School of Chemistry, University of Debrecen, H-4032 Debrecen, Hungary
| | - Dóra Bonczidai-Kelemen
- Department of Inorganic and Analytical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary.,Doctoral School of Chemistry, University of Debrecen, H-4032 Debrecen, Hungary
| | - Attila Cs Bényei
- Department of Physical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary
| | - Nóra V May
- Centre for Structural Science, Research Centre for Natural Sciences, H-1117 Budapest, Hungary
| | - István Fábián
- Department of Inorganic and Analytical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary.,MTA-DE Redox and Homogeneous Reaction Mechanisms Research Group, University of Debrecen, H-4032 Debrecen, Hungary
| | - Norbert Lihi
- Department of Inorganic and Analytical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary.,MTA-DE Redox and Homogeneous Reaction Mechanisms Research Group, University of Debrecen, H-4032 Debrecen, Hungary
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7
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Li S, Liu C, Chen Q, Jiang F, Yuan D, Sun QF, Hong M. Adaptive coordination assemblies based on a flexible tetraazacyclododecane ligand for promoting carbon dioxide fixation. Chem Sci 2022; 13:9016-9022. [PMID: 36091216 PMCID: PMC9365242 DOI: 10.1039/d2sc03093d] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 07/04/2022] [Indexed: 11/21/2022] Open
Abstract
Coordination hosts based on flexible ligands have received increasing attention due to their inherent adaptive cavities that often show induced-fit guest binding and catalysis like enzymes. Herein, we report the controlled self-assembly of a series of homo/heterometallic coordination hosts (Me4enPd)2n(ML)n [n = 2/3; M = Zn(ii)/Co(ii)/Ni(ii)/Cu(ii)/Pd(ii)/Ag(i); Me4en: N,N,N′,N′-tetramethylethylenediamine] with different shapes (tube/cage) from a flexible tetraazacyclododecane-based pyridinyl ligand (L) and cis-blocking Me4enPd(ii) units. While the Ag(i)-metalated ligand (AgL) gave rise to the formation of a (Me4enPd)4(ML)2-type cage, all other M(ii) ions led to isostructural (Me4enPd)6(ML)3-type tubular complexes. Structural transformations between cages and tubes could be realized through transmetalation of the ligand. The buffering effect on the ML panels endows the coordination tubes with remarkable acid–base resistance, which makes the (Me4enPd)6(ZnL)3 host an effective catalyst for the CO2 to CO32− conversion. Control experiments suggested that the integration of multiple active Zn(ii) sites on the tubular host and the perfect geometry match between CO32− and the cavity synergistically promoted such a conversion. Our results provide an important strategy for the design of adaptive coordination hosts to achieve efficient carbon fixation. A series of coordination hosts were prepared and their applications in CO2 fixation were studied.![]()
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Affiliation(s)
- Shaochuan Li
- State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. Fuzhou, Fujian, 350002, China
- University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Caiping Liu
- State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. Fuzhou, Fujian, 350002, China
| | - Qihui Chen
- State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. Fuzhou, Fujian, 350002, China
| | - Feilong Jiang
- State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. Fuzhou, Fujian, 350002, China
| | - Daqiang Yuan
- State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. Fuzhou, Fujian, 350002, China
| | - Qing-Fu Sun
- State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. Fuzhou, Fujian, 350002, China
| | - Maochun Hong
- State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. Fuzhou, Fujian, 350002, China
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8
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Martínez-Camarena Á, Savastano M, Blasco S, Delgado-Pinar E, Giorgi C, Bianchi A, García-España E, Bazzicalupi C. Assembly of Polyiodide Networks with Cu(II) Complexes of Pyridinol-Based Tetraaza Macrocycles. Inorg Chem 2021; 61:368-383. [PMID: 34933551 PMCID: PMC8753606 DOI: 10.1021/acs.inorgchem.1c02967] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Polyiodide networks
are currently of great practical interest for
the preparation of new electronic materials. The participation of
metals in the formation of these networks is believed to improve their
mechanical performance and thermal stability. Here we report the results
on the construction of polyiodide networks obtained using Cu(II) complexes
of a series of pyridinol-based tetraazacyclophanes as countercations.
The assembly of these crystalline polyiodides takes place from aqueous
solutions on the basis of similar structural elements, the [CuL]2+ and [Cu(H–1L)]+ (L = L2, L2-Me, L2-Me3) complex cations, so that the peculiarities induced by the
increase of N-methylation of ligands, the structural variable of ligands,
can be highlighted. First, solution equilibria involving ligands and
complexes were analyzed (potentiometry, NMR, UV–vis, ITC).
Then, the appropriate conditions could be selected to prepare polyiodides
based on the above complex cations. Single-crystal XRD analysis showed
that the coordination of pyridinol units to two metal ions is a prime
feature of these ligands, leading to polymeric coordination chains
of general formula {[Cu(H–1L)]}nn+ (L = L2-Me, L2-Me3). In the presence of the I–/I2 couple, the polymerization tendency
stops with the formation of [(CuL)(CuH–1L)]3+ (L = L2-Me, L2-Me3) dimers which are surrounded by polyiodide networks. Moreover,
coordination of the pyridinol group to two metal ions transforms the
surface charge of the ring from negative to markedly positive, generating
a suitable environment for the assembly of polyiodide anions, while
N-methylation shifts the directional control of the assembly from
H-bonds to I···I interactions. In fact, an extended
concatenation of iodine atoms occurs around the complex dimeric cations,
the supramolecular I···I interactions become shorter
and shorter, fading into stronger forces dominated by the orbital
overlap, which is promising for effective electronic materials. Polyiodides with high iodine density
are generated by Cu(II)
complexes of pyridinol-based tetraazacyclophanes. Direct coordination
of iodine atoms to Cu(II), anion−π interactions with
electron-poor aromatic surfaces, and shift of the directional control
of assembly from H-bonds to I···I interactions, governed
by N-methylation, are the main elements leading to enhanced iodine
chaining and strengthening of I···I contacts.
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Affiliation(s)
- Álvaro Martínez-Camarena
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Matteo Savastano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Salvador Blasco
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Estefanía Delgado-Pinar
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain.,Department of Chemistry, CQC, University of Coimbra, P3004-535 Coimbra, Portugal
| | - Claudia Giorgi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Enrique García-España
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
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9
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Pitchaimani J, Rajkumar STRJ, Mahalingam SM, Philip Anthony S, Moon D, Madhu V. Coordination diversity in transition metal complexes with 4-aminoantipyrine tethered bis(imino)pyridine ligand: structures, superoxide dismutase and anticancer properties. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1853109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Jayaraman Pitchaimani
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, India
| | | | - S. M. Mahalingam
- Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, India
| | | | - Dohyun Moon
- Beamline Department, Pohang Accelerator Laboratory, Pohang, Gyeongbuk, Korea
| | - Vedichi Madhu
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, India
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10
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Muñoz-Pina S, Ros-Lis JV, Delgado-Pinar EA, Martı Nez-Camarena A, Verdejo B, Garcı A-España E, Argüelles Á, Andrés A. Inhibitory Effect of Azamacrocyclic Ligands on Polyphenol Oxidase in Model and Food Systems. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:7964-7973. [PMID: 32609498 DOI: 10.1021/acs.jafc.0c02407] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Enzymatic browning is one of the main problems faced by the food industry due to the enzyme polyphenol oxidase (PPO) provoking an undesirable color change in the presence of oxygen. Here, we report the evaluation of 10 different azamacrocyclic compounds with diverse morphologies as potential inhibitors against the activity of PPO, both in model and real systems. An initial screening of 10 ligands shows that all azamacrocyclic compounds inhibit to some extent the enzymatic browning, but the molecular structure plays a crucial role on the power of inhibition. Kinetic studies of the most active ligand (L2) reveal a S-parabolic I-parabolic noncompetitive inhibition mechanism and a remarkable inhibition at micromolar concentration (IC50 = 10 μM). Furthermore, L2 action has been proven on apple juice to significantly reduce the enzymatic browning.
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Affiliation(s)
- Sara Muñoz-Pina
- Instituto Universitario de Ingenierı́a de Alimentos para el Desarrollo (IUIAD-UPV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - José V Ros-Lis
- REDOLı́, Departamento de Quı́mica Inorgánica, Universitat de València, 46100 Burjassot, Valencia, Spain
| | - Estefanı A Delgado-Pinar
- Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, Paterna, Valencia, Spain
| | - Alvaro Martı Nez-Camarena
- Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, Paterna, Valencia, Spain
| | - Begoña Verdejo
- Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, Paterna, Valencia, Spain
| | - Enrique Garcı A-España
- Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, Paterna, Valencia, Spain
| | - Ángel Argüelles
- Instituto Universitario de Ingenierı́a de Alimentos para el Desarrollo (IUIAD-UPV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Ana Andrés
- Instituto Universitario de Ingenierı́a de Alimentos para el Desarrollo (IUIAD-UPV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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11
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Martínez-Camarena Á, Sánchez-Murcia PA, Blasco S, González L, García-España E. Unveiling the reaction mechanism of novel copper N-alkylated tetra-azacyclophanes with outstanding superoxide dismutase activity. Chem Commun (Camb) 2020; 56:7511-7514. [PMID: 32510075 DOI: 10.1039/d0cc01926g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Quantum chemical and multiscale calculations reveal the mechanistic pathway of two superoxide dismutase mimetic N-alkylated tetra-azacyclophane copper complexes with remarkable activity. The arrangement of the binding site afforded by the bulky alkyl substituents and the coordinated water molecule as a proton source play key roles in the reaction mechanism.
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Affiliation(s)
- Álvaro Martínez-Camarena
- ICMol, Departamento de Química Inorgánica, University of Valencia, C/Catedrático José Beltrán 2, 46980, Paterna, Spain.
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12
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Stabilisation of Exotic Tribromide (Br 3-) Anions via Supramolecular Interaction with A Tosylated Macrocyclic Pyridinophane. A Serendipitous Case. Molecules 2020; 25:molecules25143155. [PMID: 32664239 PMCID: PMC7396983 DOI: 10.3390/molecules25143155] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/06/2020] [Accepted: 07/08/2020] [Indexed: 12/22/2022] Open
Abstract
Tetraaza-macrocyclic pyridinophane L-Ts, decorated with a p-toluenesulfonyl (tosyl; Ts) group, appear to be a useful tool to provide evidence on how the interplay of various supramolecular forces can help stabilise exotic anionic species such as tribromide (Br3−) anions. Indeed, crystals of (H2L-Ts)(Br3)1.5(NO3)0.5 unexpectedly grew from an acidic (HNO3) aqueous solution of L-Ts in the presence of Br− anions. The crystal structure of this compound was determined by single crystal XRD analysis. Hydrogen bonds, salt-bridges, anion-π, π-π stacking, and van der Waals interactions contribute to stabilising the crystal lattice. The observation of two independent Br3− anions stuck over the π-electron densities of pyridine and tosyl ligand groups, one of them being sandwiched between two pyridine rings, corroborates the significance of anion-π interactions for N-containing heterocycles. We show herein the possibility of detecting anion-π contacts from fingerprint plots generated by Hirshfeld surface analysis, demonstrating the effective usage of this structural investigation technique to further dissect individual contributions of stabilising supramolecular forces.
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Martínez-Camarena Á, Savastano M, Llinares JM, Verdejo B, Bianchi A, García-España E, Bazzicalupi C. Stabilization of polyiodide networks with Cu(ii) complexes of small methylated polyazacyclophanes: shifting directional control from H-bonds to I⋯I interactions. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00912a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Modulation of hydrogen bonds and iodine–iodine interactions, both covalent and supramolecular, unlocks novel possibilities for the construction of transition metal-polyiodide hybrid networks.
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Affiliation(s)
| | - Matteo Savastano
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | - José M. Llinares
- ICMol
- Department of Organic Chemistry
- University of Valencia
- Paterna
- Spain
| | - Begoña Verdejo
- ICMol
- Department of Inorganic Chemistry
- University of Valencia
- Paterna
- Spain
| | - Antonio Bianchi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | | | - Carla Bazzicalupi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
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14
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Green KN, Pota K, Tircsó G, Gogolák RA, Kinsinger O, Davda C, Blain K, Brewer SM, Gonzalez P, Johnston HM, Akkaraju G. Dialing in on pharmacological features for a therapeutic antioxidant small molecule. Dalton Trans 2019; 48:12430-12439. [PMID: 31342985 PMCID: PMC6863055 DOI: 10.1039/c9dt01800j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The pyridinophane molecule L2 (3,6,9,15-tetraazabicyclo[9.3.1]penta-deca-1(15),11,13-trien-13-ol) has shown promise as a therapuetic for neurodegenerative diseases involving oxidative stress and metal ion misregulation. Protonation and metal binding stability constants with Mg2+, Ca2+, Cu2+, and Zn2+ ions were determined to further explore the therapeutic and pharmacological potential of this water soluble small molecule. These studies show that incorporation of an -OH group in position 4 of the pyridine ring decreases the pI values compared to cyclen and L1 (3,6,9,15-tetraazabicyclo[9.3.1]penta-deca-1(15),11,13-triene). Furthermore, this approach tunes the basicity of the tetra-aza macrocyclic ligand through the enhanced resonance stabilization of the -OH in position 4 and rigidity of the pyridine ring such that L2 has increased basicity compared to previously reported tetra-aza macrocycles. A metal binding preference for Cu2+, a redox cycling agent known to produce oxidative stress, indicates that this would be the in vivo metal target of L2. However, the binding constant of L2 with Cu2+ is moderated compared to cyclen due to the rigidity of the ligand and shows how ligand design can be used to tune metal selectivity. An IC50 = 298.0 μM in HT-22 neuronal cells was observed. Low metabolic liability was determined in both Phase I and II in vitro models. Throughout these studies other metal binding systems were used for comparison and as appropriate controls. The reactivity reported to date and pharmacological features described herein warrant further studies in vivo and the pursuit of L2 congeners using the knowledge that pyridine substitution in a pyridinophane can be used to tune the structure of the ligand and retain the positive therapeutic outcomes.
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Affiliation(s)
- Kayla N Green
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA.
| | - Kristof Pota
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA.
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, H-4010, Hungary
| | - Réka Anna Gogolák
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, H-4010, Hungary
| | - Olivia Kinsinger
- Department of Biology, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA
| | - Collin Davda
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA.
| | - Kimberly Blain
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA. and Department of Biology, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA
| | - Samantha M Brewer
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA.
| | - Paulina Gonzalez
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA.
| | - Hannah M Johnston
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA.
| | - Giridhar Akkaraju
- Department of Biology, Texas Christian University, 2950 S. Bowie, Fort Worth, TX 76129, USA
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15
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Stabilization of Supramolecular Networks of Polyiodides with Protonated Small Tetra-azacyclophanes. INORGANICS 2019. [DOI: 10.3390/inorganics7040048] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Polyiodide chemistry is among the first historically reported examples of supramolecular forces at work. To date, owing to the increasingly recognized role of halogen bonding and the incorporation of iodine-based components in several devices, it remains an active field of theoretical and applied research. Herein we re-examine azacyclophanes as a class of ligands for the stabilization of iodine-dense three-dimensional networks, showing how we devised novel possible strategies starting from literature material. The new set of azacyclophane ligands affords novel crystal structures possessing intriguing properties, which develop on a double layer. At a macroscopic level, the obtained networks possess a very high iodine packing density (less than 2 times more diluted than crystalline I2): a simple parameter, IN, is also introduced to quickly measure and compare iodine packing density in different crystals. On the microscopic level, the present study provides evidence about the ability of one of the ligands to act as a three-dimensional supramolecular mold for the template synthesis of the rarely observed heptaiodide (I7−) anion. Therefore, we believe our approach and strategy might be relevant for crystal engineering purposes.
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