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Kaußler C, Wragg D, Schmidt C, Moreno-Alcántar G, Jandl C, Stephan J, Fischer RA, Leoni S, Casini A, Bonsignore R. "Dynamical Docking" of Cyclic Dinuclear Au(I) Bis-N-heterocyclic Complexes Facilitates Their Binding to G-Quadruplexes. Inorg Chem 2022; 61:20405-20423. [PMID: 36484812 PMCID: PMC9953335 DOI: 10.1021/acs.inorgchem.2c03041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
With the aim to improve the design of metal complexes as stabilizers of noncanonical DNA secondary structures, namely, G-quadruplexes (G4s), a series of cyclic dinuclear Au(I) N-heterocyclic carbene complexes based on xanthine and benzimidazole ligands has been synthesized and characterized by various methods, including X-ray diffraction. Fluorescence resonance energy transfer (FRET) and CD DNA melting assays unraveled the compounds' stabilization properties toward G4s of different topologies of physiological relevance. Initial structure-activity relationships have been identified and recognize the family of xanthine derivatives as those more selective toward G4s versus duplex DNA. The binding modes and free-energy landscape of the most active xanthine derivative (featuring a propyl linker) with the promoter sequence cKIT1 have been studied by metadynamics. The atomistic simulations evidenced that the Au(I) compound interacts noncovalently with the top G4 tetrad. The theoretical results on the Au(I) complex/DNA Gibbs free energy of binding were experimentally validated by FRET DNA melting assays. The compounds have also been tested for their antiproliferative properties in human cancer cells in vitro, showing generally moderate activity. This study provides further insights into the biological activity of Au(I) organometallics acting via noncovalent interactions and underlines their promise for tunable targeted applications by appropriate chemical modifications.
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Affiliation(s)
- Clemens Kaußler
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany
| | - Darren Wragg
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany
| | - Claudia Schmidt
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany
| | - Guillermo Moreno-Alcántar
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany
| | - Christian Jandl
- Catalysis
Research Center & Department of Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, Garching b. MünchenD-85748, Germany
| | - Johannes Stephan
- Catalysis
Research Center & Department of Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, Garching b. MünchenD-85748, Germany
| | - Roland A. Fischer
- Catalysis
Research Center & Department of Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, Garching b. MünchenD-85748, Germany,Chair
of Inorganic and Metal-Organic Chemistry, Department of Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, Garching b. MünchenD-85748, Germany
| | - Stefano Leoni
- School
of Chemistry, Cardiff University, Park Place, CardiffCF10 3AT, U.K.
| | - Angela Casini
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany,
| | - Riccardo Bonsignore
- Dipartimento
di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche, Università degli Studi di Palermo, Viale delle Scienze, Edificio 17, Palermo90128, Italy,
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2
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Demir Atli D, Şen B. Dinuclear silver-bis(N-heterocyclic carbene) complexes: Synthesis, catalytic activity in propargylamine formation and computational studies. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1972097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Deniz Demir Atli
- Faculty of Science and Arts, Department of Chemistry, Manisa Celal Bayar University, Manisa, Turkey
| | - Betül Şen
- Faculty of Science, Department of Physics, Dokuz Eylül University, Izmir, Buca, Turkey
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DEMİR ATLI D. Synthesis, characterization and catalytic properties of cationic N-heterocyclic carbene silver complexes. Turk J Chem 2021; 45:577-584. [PMID: 34385853 PMCID: PMC8326491 DOI: 10.3906/kim-2010-26] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 01/26/2021] [Indexed: 12/20/2022] Open
Abstract
Three new dibenzimidazolium salts bridged by 2-methylenepropane-1,3-diyl group were synthesized. Their dinuclear N-heterocyclic carbene Ag(I) complexes were prepared by the reactions of these salts with Ag2O. The structures of the synthesized compounds were defined by nuclear magnetic resonance (NMR), Fourier-transform infrared spectroscopy (FT-IR), elemental analysis, and LC-MSMS (for complexes) techniques. Stability of the silver complexes was confirmed by 1H NMR spectroscopy. Catalytic activities of Ag(I) compounds were tested for three-component coupling reaction of some aldehydes, amines, and phenylacetylene.
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Affiliation(s)
- Deniz DEMİR ATLI
- Manisa Celal Bayar University, Faculty of Science and Arts, Chemistry Department, ManisaTurkey
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Jakob CHG, Dominelli B, Schlagintweit JF, Fischer PJ, Schuderer F, Reich RM, Marques F, Correia JDG, Kühn FE. Improved Antiproliferative Activity and Fluorescence of a Dinuclear Gold(I) Bisimidazolylidene Complex via Anthracene-Modification. Chem Asian J 2020; 15:4275-4279. [PMID: 33405335 PMCID: PMC7756789 DOI: 10.1002/asia.202001104] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/12/2020] [Indexed: 12/26/2022]
Abstract
A straightforward modification route to obtain mono- and di-substituted anthroyl ester bridge functionalized dinuclear Au(I) bis-N-heterocyclic carbene complexes is presented. The functionalization can be achieved starting from a hydroxyl-functionalized ligand precursor followed by transmetallation of the corresponding Ag complex or via esterification of the hydroxyl-functionalized gold complex. The compounds are characterized by NMR-spectroscopy, ESI-MS, elemental analysis and SC-XRD. The mono-ester Au complex shows quantum yields around 18%. In contrast, the corresponding syn-di-ester Au complex, exhibits significantly lower quantum yields of around 8%. Due to insufficient water solubility of the di-ester, only the mono-ester complex has been tested regarding its antiproliferative activity against HeLa- (cervix) and MCF-7- (breast) cancer cell lines and a healthy fibroblast cell line (V79). IC50 values of 7.26 μM in the HeLa cell line and 7.92 μM in the MCF-7 cell line along with selectivity indices of 8.8 (HeLa) and 8.0 (MCF-7) are obtained. These selectivity indices are significantly higher than those obtained for the reference drugs cisplatin or auranofin.
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Affiliation(s)
- Christian H. G. Jakob
- Department of Chemistry and Catalysis Research Center, Molecular CatalysisTechnische Universität MünchenLichtenbergstraße 485748Garching bei MünchenGermany
| | - Bruno Dominelli
- Department of Chemistry and Catalysis Research Center, Molecular CatalysisTechnische Universität MünchenLichtenbergstraße 485748Garching bei MünchenGermany
| | - Jonas F. Schlagintweit
- Department of Chemistry and Catalysis Research Center, Molecular CatalysisTechnische Universität MünchenLichtenbergstraße 485748Garching bei MünchenGermany
| | - Pauline J. Fischer
- Department of Chemistry and Catalysis Research Center, Molecular CatalysisTechnische Universität MünchenLichtenbergstraße 485748Garching bei MünchenGermany
| | - Franziska Schuderer
- Department of Chemistry and Catalysis Research Center, Molecular CatalysisTechnische Universität MünchenLichtenbergstraße 485748Garching bei MünchenGermany
| | - Robert M. Reich
- Department of Chemistry and Catalysis Research Center, Molecular CatalysisTechnische Universität MünchenLichtenbergstraße 485748Garching bei MünchenGermany
| | - Fernanda Marques
- Centro de Ciências e Tecnologias Nucleares and Departamento de Engenharia e Ciências Nucleares, Instituto Superior TécnicoUniversidade de LisboaCampus Tecnológico e Nuclear, Estrada Nacional N° 10 (km 139,7)2695-066Bobadela LRSPortugal
| | - João D. G. Correia
- Centro de Ciências e Tecnologias Nucleares and Departamento de Engenharia e Ciências Nucleares, Instituto Superior TécnicoUniversidade de LisboaCampus Tecnológico e Nuclear, Estrada Nacional N° 10 (km 139,7)2695-066Bobadela LRSPortugal
| | - Fritz E. Kühn
- Department of Chemistry and Catalysis Research Center, Molecular CatalysisTechnische Universität MünchenLichtenbergstraße 485748Garching bei MünchenGermany
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5
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Bernd MA, Bauer EB, Oberkofler J, Bauer A, Reich RM, Kühn FE. Macrocyclic NHC complexes of group 10 elements with enlarged aromaticity for biological studies. Dalton Trans 2020; 49:14106-14114. [PMID: 33016296 DOI: 10.1039/d0dt02598d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Two sets of macrocyclic, bio-inspired, non-heme ligands are utilized for the synthesis of NiII, PdII and PtII complexes. The ligands consist of a 16-atom macrocycle, formed by four methylene bridged NHC moieties, with imidazole or benzimidazole as building blocks. The complexes exhibit a square planar coordination geometry and are characterized by NMR, ESI-MS, elemental analysis, SC-XRD and UV/Vis. For complexes incorporating benzimidazole, an evaluation of luminescence properties is performed, and is found that phosphorescence is present for the PdII derivative and there is fluorescence for the PtII derivative. Stability studies in cell culture medium are performed for subsequent MTT assays. Here, the NiII complexes show low to no activity, and PdII and PtII complexes exhibit remarkable low IC50 values in cisplatin resistant A2780cisR cells.
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Affiliation(s)
- Marco A Bernd
- Department of Chemistry and Catalysis Research Center, Molecular Catalysis, Technische Universität München, Lichtenbergstr. 4, 85747 Garching b. München, Germany.
| | - Elisabeth B Bauer
- Department of Chemistry and Catalysis Research Center, Molecular Catalysis, Technische Universität München, Lichtenbergstr. 4, 85747 Garching b. München, Germany.
| | - Jens Oberkofler
- Department of Chemistry and Catalysis Research Center, Molecular Catalysis, Technische Universität München, Lichtenbergstr. 4, 85747 Garching b. München, Germany.
| | - Andreas Bauer
- Department of Chemistry and Catalysis Research Center, Chair of Organic Chemistry I, Technische Universität München, Lichtenbergstr. 4, 85747 Garching b. München, Germany.
| | - Robert M Reich
- Department of Chemistry and Catalysis Research Center, Molecular Catalysis, Technische Universität München, Lichtenbergstr. 4, 85747 Garching b. München, Germany.
| | - Fritz E Kühn
- Department of Chemistry and Catalysis Research Center, Molecular Catalysis, Technische Universität München, Lichtenbergstr. 4, 85747 Garching b. München, Germany.
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Jakob CHG, Dominelli B, Rieb J, Jandl C, Pöthig A, Reich RM, Correia JDG, Kühn FE. Dinuclear Gold(I) Complexes Bearing N,N'-Allyl-Bridged Bisimidazolylidene Ligands. Chem Asian J 2020; 15:1848-1851. [PMID: 32348033 PMCID: PMC7687270 DOI: 10.1002/asia.202000453] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 04/28/2020] [Indexed: 11/30/2022]
Abstract
A novel N,N'-allyl-bridged bisimidazolium salt and a novel dinuclear Ag(I) and a Au(I) NHC complex are reported. Both metallacyclic complexes have a twisted structural shape due to the rigid allylic system and form two different isomers relating to the position of the double bonds. The allyl-group shows photoisomerisation, but no reactivity towards bases for the additional coordination of Pd(II).
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Affiliation(s)
- Christian H. G. Jakob
- Catalysis Research CenterMolecular CatalysisTechnische Universität MünchenErnst-Otto-Fischer-Straße 1D-85748Garching bei MünchenGermany
| | - Bruno Dominelli
- Catalysis Research CenterMolecular CatalysisTechnische Universität MünchenErnst-Otto-Fischer-Straße 1D-85748Garching bei MünchenGermany
| | - Julia Rieb
- Catalysis Research CenterMolecular CatalysisTechnische Universität MünchenErnst-Otto-Fischer-Straße 1D-85748Garching bei MünchenGermany
| | - Christian Jandl
- Catalysis Research CenterMolecular CatalysisTechnische Universität MünchenErnst-Otto-Fischer-Straße 1D-85748Garching bei MünchenGermany
| | - Alexander Pöthig
- Catalysis Research CenterMolecular CatalysisTechnische Universität MünchenErnst-Otto-Fischer-Straße 1D-85748Garching bei MünchenGermany
| | - Robert M. Reich
- Catalysis Research CenterMolecular CatalysisTechnische Universität MünchenErnst-Otto-Fischer-Straße 1D-85748Garching bei MünchenGermany
| | - João D. G. Correia
- Centro de Ciências e Tecnologias Nucleares and Departamento de Engenharia e Ciências NuclearesInstituto Superior TécnicoUniversidade de LisboaCampus Tecnológico e NuclearEstrada Nacional N° 10 (km 139,7)2695-066Bobadela LRSPortugal
| | - Fritz E. Kühn
- Catalysis Research CenterMolecular CatalysisTechnische Universität MünchenErnst-Otto-Fischer-Straße 1D-85748Garching bei MünchenGermany
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