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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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Stoppa V, Scattolin T, Bevilacqua M, Baron M, Graiff C, Orian L, Biffis A, Menegazzo I, Roverso M, Bogialli S, Visentin F, Tubaro C. Mononuclear and dinuclear gold( i) complexes with a caffeine-based di(N-heterocyclic carbene) ligand: synthesis, reactivity and structural DFT analysis. NEW J CHEM 2021. [DOI: 10.1039/d0nj05906d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Two gold(i) complexes with caffeine-based di(N-heterocyclic carbene) ligands were synthesised and fully characterised.
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Zhu P, Lu J, Hong L, Su W, Van Schepdael A, Adams E. Characterization of an unknown impurity in doxofylline using LC–MS and NMR. J Pharm Biomed Anal 2017; 140:31-37. [DOI: 10.1016/j.jpba.2017.03.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 03/08/2017] [Accepted: 03/14/2017] [Indexed: 11/25/2022]
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Avasthi K, Kumar A, Aswal S, Kant R, Raghunandan R, Maulik PR, Khanna RS, Ravikumar K. Role of arene interactions and substituent effects in conformational (syn/anti) control of 1,2-diarylethanes. CrystEngComm 2012. [DOI: 10.1039/c1ce06001e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sutherland TE, Andersen OA, Betou M, Eggleston IM, Maizels RM, van Aalten D, Allen JE. Analyzing airway inflammation with chemical biology: dissection of acidic mammalian chitinase function with a selective drug-like inhibitor. ACTA ACUST UNITED AC 2011; 18:569-79. [PMID: 21609838 PMCID: PMC3115046 DOI: 10.1016/j.chembiol.2011.02.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 02/21/2011] [Accepted: 02/28/2011] [Indexed: 12/20/2022]
Abstract
Acidic mammalian chitinase (AMCase) is produced in the lung during allergic inflammation and asthma, and inhibition of enzymatic activity has been considered as a therapeutic strategy. However, most chitinase inhibitors are nonselective, additionally inhibiting chitotriosidase activity. Here, we describe bisdionin F, a competitive AMCase inhibitor with 20-fold selectivity for AMCase over chitotriosidase, designed by utilizing the AMCase crystal structure and dicaffeine scaffold. In a murine model of allergic inflammation, bisdionin F-treatment attenuated chitinase activity and alleviated the primary features of allergic inflammation including eosinophilia. However, selective AMCase inhibition by bisdionin F also caused dramatic and unexpected neutrophilia in the lungs. This class of inhibitor will be a powerful tool to dissect the functions of mammalian chitinases in disease and represents a synthetically accessible scaffold to optimize inhibitory properties in terms of airway inflammation.
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Affiliation(s)
- Tara E Sutherland
- Centre for Immunity, Infection and Evolution, and the Institute of Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, Scotland, UK
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Schüttelkopf AW, Andersen OA, Rao FV, Allwood M, Rush CL, Eggleston IM, van Aalten DMF. Bisdionin C-a rationally designed, submicromolar inhibitor of family 18 chitinases. ACS Med Chem Lett 2011; 2:428-32. [PMID: 24900325 DOI: 10.1021/ml200008b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Accepted: 03/11/2011] [Indexed: 11/29/2022] Open
Abstract
Chitinases of the GH18 family play important roles in a variety of pathogenic organisms and have also been shown to be involved in human asthma progression, making these enzymes potential drug targets. While a number of potent GH18 chitinase inhibitors have been described, in general, these compounds suffer from limited synthetic accessibility or unfavorable medicinal-chemical properties, making them poor starting points for the development of chitinase-targeted drugs. Exploiting available structural data, we have rationally designed bisdionin C, a submicromolar inhibitor of GH18 enzymes, that possesses desirable druglike properties and tractable chemical synthesis. A crystallographic structure of a chitinase-bisdionin C complex shows the two aromatic systems of the ligand interacting with two conserved tryptophan residues exposed in the active site cleft of the enzyme, while at the same time forming extensive hydrogen-bonding interactions with the catalytic machinery. The observed mode of binding, together with inhibition data, suggests that bisdionin C presents an attractive starting point for the development of specific inhibitors of bacterial-type, but not plant-type, GH 18 chitinases.
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Affiliation(s)
- Alexander W. Schüttelkopf
- Division of Molecular Microbiology and ‡Division of Biological Chemistry and Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, Scotland
| | - Ole A. Andersen
- Division of Molecular Microbiology and ‡Division of Biological Chemistry and Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, Scotland
| | - Francesco V. Rao
- Division of Molecular Microbiology and ‡Division of Biological Chemistry and Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, Scotland
| | - Matthew Allwood
- Division of Molecular Microbiology and ‡Division of Biological Chemistry and Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, Scotland
| | - Christina L. Rush
- Division of Molecular Microbiology and ‡Division of Biological Chemistry and Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, Scotland
| | - Ian M. Eggleston
- Division of Molecular Microbiology and ‡Division of Biological Chemistry and Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, Scotland
| | - Daan M. F. van Aalten
- Division of Molecular Microbiology and ‡Division of Biological Chemistry and Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, Scotland
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Itahara T. NMR Study of Stacking Interactions between Thymine and 1,3-Dimethylxanthine Rings. Supramol Chem 2008. [DOI: 10.1080/10610279908559285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Toshio Itahara
- a Department of Bioengineering, Faculty of Engineering , Kagoshima University , Korimoto, Kagoshima 890, Japan
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Avasthi K, Aswal S, Kumar R, Yadav U, Rawat DS, Maulik PR. Fine tuning of folded conformation by change of substituents: 1H NMR and crystallographic evidence for folded conformation due to arene interactions in pyrazolo[3,4-d]pyrimidine core based ‘propylene linker’ compounds. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2005.04.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Morey J, Ballester P, Barceló MA, Costa A, Deyà PM. Thermodynamic study on supramolecular complex formation of theophylline derivates with a synthetic receptor. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)01245-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Itahara T. NMR and UV Study of 1,1′-(α,ω-Alkanediyl)bis[thymine] and 1,1′-(α,ω-Alkanediyl)bis[uracil]. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1997. [DOI: 10.1246/bcsj.70.2239] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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