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Smith N, Quan D, Nagalingam G, Triccas JA, Rendina LM, Rutledge PJ. Carborane clusters increase the potency of bis-substituted cyclam derivatives against Mycobacterium tuberculosis. RSC Med Chem 2022; 13:1234-1238. [PMID: 36325397 PMCID: PMC9579921 DOI: 10.1039/d2md00150k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 07/28/2022] [Indexed: 08/04/2023] Open
Abstract
Bis-substituted cyclam derivatives have recently emerged as a promising new class of antibacterial agents, displaying excellent activity against drug-resistant Mycobacterium tuberculosis (Mtb) and in vivo efficacy in a zebrafish assay. Herein we report the synthesis and biological activity of new carborane derivatives within this class of antitubercular compounds. The resulting carborane-cyclam conjugates incorporating either hydrophobic closo-1,2-carborane or anionic, hydrophilic nido-7,8-carborane clusters display promising activity in an antibacterial assay employing the virulent Mtb strain H37Rv. The most active of these carborane derivatives exhibit MIC50 values of <1 μM, making them the most active compounds in this unique class of antibacterial cyclams reported to date.
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Affiliation(s)
- Nicholas Smith
- School of Chemistry, The University of Sydney Sydney NSW 2006 Australia +61 2 9351 5020 +61 2 9351 4781
| | - Diana Quan
- Sydney Institute of Infectious Diseases and Charles Perkins Centre, The University of Sydney Sydney NSW 2006 Australia
- School of Medical Sciences, The University of Sydney Sydney NSW 2006 Australia
| | - Gayathri Nagalingam
- Sydney Institute of Infectious Diseases and Charles Perkins Centre, The University of Sydney Sydney NSW 2006 Australia
- School of Medical Sciences, The University of Sydney Sydney NSW 2006 Australia
| | - James A Triccas
- Sydney Institute of Infectious Diseases and Charles Perkins Centre, The University of Sydney Sydney NSW 2006 Australia
- School of Medical Sciences, The University of Sydney Sydney NSW 2006 Australia
| | - Louis M Rendina
- School of Chemistry, The University of Sydney Sydney NSW 2006 Australia +61 2 9351 5020 +61 2 9351 4781
- The University of Sydney Nano Institute (Sydney Nano), The University of Sydney Sydney NSW 2006 Australia
| | - Peter J Rutledge
- School of Chemistry, The University of Sydney Sydney NSW 2006 Australia +61 2 9351 5020 +61 2 9351 4781
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2
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Counsell AJ, Yu M, Shi M, Jones AT, Batten JM, Turner P, Todd MH, Rutledge PJ. Copper(ii) complexes of N-propargyl cyclam ligands reveal a range of coordination modes and colours, and unexpected reactivity. Dalton Trans 2021; 50:3931-3942. [PMID: 33635937 DOI: 10.1039/d0dt03736b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The coordination chemistry of N-functionalised cyclam ligands has a rich history, yet cyclam derivatives with pendant alkynes are largely unexplored. This is despite the significant potential and burgeoning application of N-propargyl cyclams and related compounds in the creation of diversely functionalised cyclam derivatives via copper-catalysed azide-alkyne 'click' reactions. Herein we describe single crystal X-ray diffraction and spectroscopic investigations of the coordination chemistry of copper(ii) complexes of cyclam derivatives with between 1 and 4 pendant alkynes. The crystal structures of these copper complexes unexpectedly reveal a range of coordination modes, and the surprising occurrence of five unique complexes within a single recrystallisation of the tetra-N-propargyl cyclam ligand. One of these species exhibits weak intramolecular copper-alkyne coordination, and another is formed by a surprising intramolecular copper-mediated hydroalkoxylation reaction with the solvent methanol, transforming one of the pendant alkynes to an enol ether. Multiple functionalisation of the tetra-N-propargyl ligand is demonstrated via a 'tetra-click' reaction with benzyl azide, and the copper-binding behaviour of the resulting tetra-triazole ligand is characterised spectroscopically.
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Affiliation(s)
- Andrew J Counsell
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia.
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3
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Dinarvand M, Spain MP, Vafaee F. Pharmacodynamic Functions of Synthetic Derivatives for Treatment of Methicillin-Resistant Staphylococcus aureus (MRSA) and Mycobacterium tuberculosis. Front Microbiol 2020; 11:551189. [PMID: 33329419 PMCID: PMC7729195 DOI: 10.3389/fmicb.2020.551189] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 11/05/2020] [Indexed: 12/26/2022] Open
Abstract
Drug resistant bacteria have emerged, so robust methods are needed to evaluate combined activities of known antibiotics as well as new synthetic compounds as novel antimicrobial agents to treatment efficacy in severe bacterial infections. Marine natural products (MNPs) have become new strong leads in the drug discovery endeavor and an effective alternative to control infections. Herein, we report the bioassay guided fractionation of marine extracts from the sponges Lendenfeldia, Ircinia, and Dysidea that led us to identify novel compounds with antimicrobial properties. Chemical synthesis of predicted compounds and their analogs has confirmed that the proposed structures may encode novel chemical structures with promising antimicrobial activity against the medically important pathogens. Several of the synthetic analogs exhibited potent and broad spectrum in vitro antibacterial activity, especially against the Methicillin-resistant Staphylococcus aureus (MRSA) (MICs to 12.5 μM), Mycobacterium tuberculosis (MICs to 0.02 μM), uropathogenic Escherichia coli (MIC o 6.2 μM), and Pseudomonas aeruginosa (MIC to 3.1 μM). Checkerboard assay (CA) and time-kill studies (TKS) experiments analyzed with the a pharmacodynamic model, have potentials for in vitro evaluation of new and existing antimicrobials. In this study, CA and TKS were used to identify the potential benefits of an antibiotic combination (i.e., synthetic compounds, vancomycin, and rifampicin) for the treatment of MRSA and M. tuberculosis infections. CA experiments indicated that the association of compounds 1a and 2a with vancomycin and compound 3 with rifampicin combination have a synergistic effect against a MRSA and M. tuberculosis infections, respectively. Furthermore, the analysis of TKS uncovered bactericidal and time-dependent properties of the synthetic compounds that may be due to variations in hydrophobicity and mechanisms of action of the molecules tested. The results of cross-referencing antimicrobial activity, and toxicity, CA, and Time-Kill experiments establish that these synthetic compounds are promising potential leads, with a favorable therapeutic index for antimicrobial drug development.
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Affiliation(s)
- Mojdeh Dinarvand
- School of Chemistry, Faculty of Science, The University of Sydney, Sydney, NSW, Australia
- Department of Infectious Diseases and Immunology, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
- School of Biotechnology and Biomolecular Sciences, Faculty of Science, University of New South Wales, Sydney, NSW, Australia
| | - Malcolm P. Spain
- School of Chemistry, Faculty of Science, The University of Sydney, Sydney, NSW, Australia
| | - Fatemeh Vafaee
- School of Biotechnology and Biomolecular Sciences, Faculty of Science, University of New South Wales, Sydney, NSW, Australia
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4
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Frei A, Zuegg J, Elliott AG, Baker M, Braese S, Brown C, Chen F, G Dowson C, Dujardin G, Jung N, King AP, Mansour AM, Massi M, Moat J, Mohamed HA, Renfrew AK, Rutledge PJ, Sadler PJ, Todd MH, Willans CE, Wilson JJ, Cooper MA, Blaskovich MAT. Metal complexes as a promising source for new antibiotics. Chem Sci 2020; 11:2627-2639. [PMID: 32206266 PMCID: PMC7069370 DOI: 10.1039/c9sc06460e] [Citation(s) in RCA: 228] [Impact Index Per Article: 57.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 02/10/2020] [Indexed: 12/16/2022] Open
Abstract
There is a dire need for new antimicrobial compounds to combat the growing threat of widespread antibiotic resistance. With a currently very scarce drug pipeline, consisting mostly of derivatives of known antibiotics, new classes of antibiotics are urgently required. Metal complexes are currently in clinical development for the treatment of cancer, malaria and neurodegenerative diseases. However, only little attention has been paid to their application as potential antimicrobial compounds. We report the evaluation of 906 metal-containing compounds that have been screened by the Community for Open Antimicrobial Drug Discovery (CO-ADD) for antimicrobial activity. Metal-bearing compounds display a significantly higher hit-rate (9.9%) when compared to the purely organic molecules (0.87%) in the CO-ADD database. Out of 906 compounds, 88 show activity against at least one of the tested strains, including fungi, while not displaying any cytotoxicity against mammalian cell lines or haemolytic properties. Herein, we highlight the structures of the 30 compounds with activity against Gram-positive and/or Gram-negative bacteria containing Mn, Co, Zn, Ru, Ag, Eu, Ir and Pt, with activities down to the nanomolar range against methicillin resistant S. aureus (MRSA). 23 of these complexes have not been reported for their antimicrobial properties before. This work reveals the vast diversity that metal-containing compounds can bring to antimicrobial research. It is important to raise awareness of these types of compounds for the design of truly novel antibiotics with potential for combatting antimicrobial resistance.
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Affiliation(s)
- Angelo Frei
- Centre for Superbug Solutions , Institute for Molecular Bioscience , The University of Queensland , St. Lucia , Queensland 4072 , Australia . ;
| | - Johannes Zuegg
- Centre for Superbug Solutions , Institute for Molecular Bioscience , The University of Queensland , St. Lucia , Queensland 4072 , Australia . ;
| | - Alysha G Elliott
- Centre for Superbug Solutions , Institute for Molecular Bioscience , The University of Queensland , St. Lucia , Queensland 4072 , Australia . ;
| | - Murray Baker
- School of Molecular Sciences , The University of Western Australia , Stirling Highway , 6009 Perth , Australia
| | - Stefan Braese
- Institute of Organic Chemistry , Karlsruhe Institute of Technology (KIT) , Fritz-Haber-Weg 6 , 76131 Karlsruhe , Germany
- Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS) , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , D-76344 Eggenstein-Leopoldshafen , Germany
| | - Christopher Brown
- School of Medical Sciences (Discipline of Pharmacology) , University of Sydney , Australia
| | - Feng Chen
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK
| | - Christopher G Dowson
- Antimicrobial Screening Facility , School of Life Sciences , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK
| | - Gilles Dujardin
- Institute of Molecules and Matter of Le Mans (IMMM) , UMR 6283 CNRS , Le Mans Université , France
| | - Nicole Jung
- Institute of Organic Chemistry , Karlsruhe Institute of Technology (KIT) , Fritz-Haber-Weg 6 , 76131 Karlsruhe , Germany
- Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS) , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , D-76344 Eggenstein-Leopoldshafen , Germany
| | - A Paden King
- Department of Chemistry and Chemical Biology , Cornell University , Ithaca , NY 14853 , USA
| | - Ahmed M Mansour
- Chemistry Department , Faculty of Science , Cairo University , Egypt
| | - Massimiliano Massi
- School of Molecular and Life Sciences - Curtin Institute for Functional Materials and Interfaces , Curtin University , Kent Street , 6102 Bentley WA , Australia
| | - John Moat
- Antimicrobial Screening Facility , School of Life Sciences , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK
| | - Heba A Mohamed
- School of Chemistry , University of Leeds , Woodhouse Lane , Leeds LS2 9JT , UK
| | - Anna K Renfrew
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Peter J Rutledge
- School of Medical Sciences (Discipline of Pharmacology) , University of Sydney , Australia
| | - Peter J Sadler
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK
| | - Matthew H Todd
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
- School of Pharmacy , University College London , London , WC1N 1AX , UK
| | - Charlotte E Willans
- School of Chemistry , University of Leeds , Woodhouse Lane , Leeds LS2 9JT , UK
| | - Justin J Wilson
- Department of Chemistry and Chemical Biology , Cornell University , Ithaca , NY 14853 , USA
| | - Matthew A Cooper
- Centre for Superbug Solutions , Institute for Molecular Bioscience , The University of Queensland , St. Lucia , Queensland 4072 , Australia . ;
| | - Mark A T Blaskovich
- Centre for Superbug Solutions , Institute for Molecular Bioscience , The University of Queensland , St. Lucia , Queensland 4072 , Australia . ;
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5
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Spain M, Wong JKH, Nagalingam G, Batten JM, Hortle E, Oehlers SH, Jiang XF, Murage HE, Orford JT, Crisologo P, Triccas JA, Rutledge PJ, Todd MH. Antitubercular Bis-Substituted Cyclam Derivatives: Structure-Activity Relationships and in Vivo Studies. J Med Chem 2018; 61:3595-3608. [PMID: 29558124 DOI: 10.1021/acs.jmedchem.7b01569] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We recently reported the discovery of nontoxic cyclam-derived compounds that are active against drug-resistant Mycobacterium tuberculosis. In this paper we report exploration of the structure-activity relationship for this class of compounds, identifying several simpler compounds with comparable activity. The most promising compound identified, possessing significantly improved water solubility, displayed high levels of bacterial clearance in an in vivo zebrafish embryo model, suggesting this compound series has promise for in vivo treatment of tuberculosis.
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Affiliation(s)
- Malcolm Spain
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Joseph K-H Wong
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Gayathri Nagalingam
- Microbial Immunity and Pathogenesis Group, Department of Infectious Diseases and Immunology, Sydney Medical School , The University of Sydney , Sydney , NSW 2006 , Australia
| | - James M Batten
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Elinor Hortle
- Tuberculosis Research Program , Centenary Institute, Royal Prince Alfred Hospital , Missenden Road , Camperdown, Sydney , NSW 2050 , Australia
| | - Stefan H Oehlers
- Central Clinical School, Sydney Medical School , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Xiao Fan Jiang
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Hasini E Murage
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Jack T Orford
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Patrick Crisologo
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - James A Triccas
- Microbial Immunity and Pathogenesis Group, Department of Infectious Diseases and Immunology, Sydney Medical School , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Peter J Rutledge
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
| | - Matthew H Todd
- School of Chemistry , The University of Sydney , Sydney , NSW 2006 , Australia
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Lau YH, Clegg JK, Price JR, Macquart RB, Todd MH, Rutledge PJ. Molecular Switches for any pH: A Systematic Study of the Versatile Coordination Behaviour of Cyclam Scorpionands. Chemistry 2017; 24:1573-1585. [DOI: 10.1002/chem.201703488] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Yu Heng Lau
- School of Chemistry The University of Sydney Sydney, New South Wales 2006 Australia
| | - Jack K. Clegg
- Current Address: School of Chemistry and Molecular Biosciences The University of Queensland St Lucia QLD 4072 Australia
| | - Jason R. Price
- Current Address: The Australian Synchrotron 800 Blackburn Rd. Clayton VIC 3168 Australia
| | - Rene B. Macquart
- School of Chemistry The University of Sydney Sydney, New South Wales 2006 Australia
| | - Matthew H. Todd
- School of Chemistry The University of Sydney Sydney, New South Wales 2006 Australia
| | - Peter J. Rutledge
- School of Chemistry The University of Sydney Sydney, New South Wales 2006 Australia
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7
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Wong JK, Proschogo N, Todd MH, Rutledge PJ. Selective Displacement of a Scorpionand Triazole Ligand from Metallocyclam Complexes Visualised with NMR Spectroscopy. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601474] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Joseph K.‐H. Wong
- School of Chemistry The University of Sydney 2006 Sydney New South Wales Australia
| | - Nicholas Proschogo
- School of Chemistry The University of Sydney 2006 Sydney New South Wales Australia
| | - Matthew H. Todd
- School of Chemistry The University of Sydney 2006 Sydney New South Wales Australia
| | - Peter J. Rutledge
- School of Chemistry The University of Sydney 2006 Sydney New South Wales Australia
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8
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Counsell AJ, Jones AT, Todd MH, Rutledge PJ. A direct method for the N-tetraalkylation of azamacrocycles. Beilstein J Org Chem 2017; 12:2457-2461. [PMID: 28144313 PMCID: PMC5238601 DOI: 10.3762/bjoc.12.239] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 11/01/2016] [Indexed: 11/23/2022] Open
Abstract
An efficient protocol for the direct synthesis of N-tetraalkylated derivatives of the azamacrocycles cyclam and cyclen has been developed, using a partially miscible aqueous–organic solvent system with propargyl bromide, benzyl bromide, and related halides. The method works most effectively when the reaction mixture is shaken, not stirred. A crystal structure of the N-tetrapropargyl cyclam derivative 1,4,8,11-tetra(prop-2-yn-1-yl)-1,4,8,11-tetraazacyclotetradecane diperchlorate is reported.
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Affiliation(s)
- Andrew J Counsell
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Angus T Jones
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Matthew H Todd
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Peter J Rutledge
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
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9
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Recent Advances in Macrocyclic Fluorescent Probes for Ion Sensing. Molecules 2017; 22:molecules22020200. [PMID: 28125069 DOI: 10.3390/molecules22020200] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 01/13/2017] [Accepted: 01/16/2017] [Indexed: 12/18/2022] Open
Abstract
Small-molecule fluorescent probes play a myriad of important roles in chemical sensing. Many such systems incorporating a receptor component designed to recognise and bind a specific analyte, and a reporter or transducer component which signals the binding event with a change in fluorescence output have been developed. Fluorescent probes use a variety of mechanisms to transmit the binding event to the reporter unit, including photoinduced electron transfer (PET), charge transfer (CT), Förster resonance energy transfer (FRET), excimer formation, and aggregation induced emission (AIE) or aggregation caused quenching (ACQ). These systems respond to a wide array of potential analytes including protons, metal cations, anions, carbohydrates, and other biomolecules. This review surveys important new fluorescence-based probes for these and other analytes that have been reported over the past five years, focusing on the most widely exploited macrocyclic recognition components, those based on cyclam, calixarenes, cyclodextrins and crown ethers; other macrocyclic and non-macrocyclic receptors are also discussed.
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10
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Wong JK, Ast S, Yu M, Flehr R, Counsell AJ, Turner P, Crisologo P, Todd MH, Rutledge PJ. Synthesis and Evaluation of 1,8-Disubstituted-Cyclam/Naphthalimide Conjugates as Probes for Metal Ions. ChemistryOpen 2016; 5:375-85. [PMID: 27547648 PMCID: PMC4981059 DOI: 10.1002/open.201600010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Indexed: 12/21/2022] Open
Abstract
Fluorescent molecular probes for metal ions have a raft of potential applications in chemistry and biomedicine. We report the synthesis and photophysical characterisation of 1,8‐disubstituted‐cyclam/naphthalimide conjugates and their zinc complexes. An efficient synthesis of 1,8‐bis‐(2‐azidoethyl)cyclam has been developed and used to prepare 1,8‐disubstituted triazolyl‐cyclam systems, in which the pendant group is connected to triazole C4. UV/Vis and fluorescence emission spectra, zinc binding experiments, fluorescence quantum yield and lifetime measurements and pH titrations of the resultant bis‐naphthalimide ligand elucidate a complex pattern of photophysical behaviour. Important differences arise from the inclusion of two fluorophores in the one probe and from the variation of triazole substitution pattern (dye at C4 vs. N1). Introducing a second fluorophore greatly extends fluorescence lifetimes, whereas the altered substitution pattern at the cyclam amines exerts a major influence on fluorescence output and metal binding. Crystal structures of two key zinc complexes evidence variations in triazole coordination that mirror the solution‐phase behaviour of these systems.
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Affiliation(s)
| | - Sandra Ast
- School of ChemistryThe University of SydneySydneyNSW2006Australia
| | - Mingfeng Yu
- School of ChemistryThe University of SydneySydneyNSW2006Australia
| | - Roman Flehr
- Institute for ChemistryUniversity of PotsdamKarl-Liebknecht St. 24—2514476PotsdamGermany
| | | | - Peter Turner
- School of ChemistryThe University of SydneySydneyNSW2006Australia
- Crystal Structure Analysis FacilityThe University of SydneySydneyNSW2006Australia
| | | | - Matthew H. Todd
- School of ChemistryThe University of SydneySydneyNSW2006Australia
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11
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Yu M, Nagalingam G, Ellis S, Martinez E, Sintchenko V, Spain M, Rutledge PJ, Todd MH, Triccas JA. Nontoxic Metal-Cyclam Complexes, a New Class of Compounds with Potency against Drug-Resistant Mycobacterium tuberculosis. J Med Chem 2016; 59:5917-21. [PMID: 27214150 DOI: 10.1021/acs.jmedchem.6b00432] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Tuberculosis (TB) accounted for 1.5 million deaths in 2014, and new classes of anti-TB drugs are required. We report a class of functionalized 1,8-disubstituted cyclam derivatives that display low micromolar activity against pathogenic mycobacteria. These compounds inhibit intracellular growth of Mycobacterium tuberculosis, are nontoxic to human cell lines, and are active against multidrug-resistant M. tuberculosis strains, indicating a distinct mode of action. These compounds warrant further appraisal as novel agents to control TB in humans.
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Affiliation(s)
- Mingfeng Yu
- School of Chemistry, The University of Sydney , Sydney, NSW 2006, Australia
| | - Gayathri Nagalingam
- Microbial Immunity and Pathogenesis Group, Department of Infectious Diseases and Immunology, Sydney Medical School, The University of Sydney , Sydney, NSW 2006, Australia
| | - Samantha Ellis
- Microbial Immunity and Pathogenesis Group, Department of Infectious Diseases and Immunology, Sydney Medical School, The University of Sydney , Sydney, NSW 2006, Australia
| | - Elena Martinez
- Centre for Infectious Diseases and Microbiology Laboratory Services, Institute of Clinical Pathology and Medical Research-Pathology West, Westmead Hospital, Westmead, NSW 2145, Australia
| | - Vitali Sintchenko
- Centre for Infectious Diseases and Microbiology Laboratory Services, Institute of Clinical Pathology and Medical Research-Pathology West, Westmead Hospital, Westmead, NSW 2145, Australia
| | - Malcolm Spain
- School of Chemistry, The University of Sydney , Sydney, NSW 2006, Australia
| | - Peter J Rutledge
- School of Chemistry, The University of Sydney , Sydney, NSW 2006, Australia
| | - Matthew H Todd
- School of Chemistry, The University of Sydney , Sydney, NSW 2006, Australia
| | - James A Triccas
- Microbial Immunity and Pathogenesis Group, Department of Infectious Diseases and Immunology, Sydney Medical School, The University of Sydney , Sydney, NSW 2006, Australia
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12
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Yu M, Wong JKH, Tang C, Turner P, Todd MH, Rutledge PJ. Efficient deprotection of F-BODIPY derivatives: removal of BF2 using Brønsted acids. Beilstein J Org Chem 2015; 11:37-41. [PMID: 25670990 PMCID: PMC4311716 DOI: 10.3762/bjoc.11.6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 12/22/2014] [Indexed: 11/23/2022] Open
Abstract
The effective and efficient removal of the BF2 moiety from F-BODIPY derivatives has been achieved using two common Brønsted acids; treatment with trifluoroacetic acid (TFA) or methanolic hydrogen chloride (HCl) followed by work-up with Ambersep(®) 900 resin (hydroxide form) effects this conversion in near-quantitative yields. Compared to existing methods, these conditions are relatively mild and operationally simple, requiring only reaction at room temperature for six hours (TFA) or overnight (HCl).
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Affiliation(s)
- Mingfeng Yu
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Joseph K-H Wong
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Cyril Tang
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Peter Turner
- Crystal Structure Analysis Facility, School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Matthew H Todd
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Peter J Rutledge
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
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13
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Yu M, Ast S, Yu Q, Lo ATS, Flehr R, Todd MH, Rutledge PJ. Incorporating a piperidinyl group in the fluorophore extends the fluorescence lifetime of click-derived cyclam-naphthalimide conjugates. PLoS One 2014; 9:e100761. [PMID: 24983863 PMCID: PMC4077572 DOI: 10.1371/journal.pone.0100761] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 05/28/2014] [Indexed: 01/12/2023] Open
Abstract
Ligands incorporating a tetraazamacrocycle receptor, a ‘click’- derived triazole and a 1,8-naphthalimide fluorophore have proven utility as probes for metal ions. Three new cyclam-based molecular probes are reported, in which a piperidinyl group has been introduced at the 4-position of the naphthalimide fluorophore. These compounds have been synthesized using the copper(I)-catalyzed azide-alkyne Huisgen cycloaddition and their photophysical properties studied in detail. The alkylamino group induces the expected red-shift in absorption and emission spectra relative to the simple naphthalimide derivatives and gives rise to extended fluorescence lifetimes in aqueous buffer. The photophysical properties of these systems are shown to be highly solvent-dependent. Screening the fluorescence responses of the new conjugates to a wide variety of metal ions reveals significant and selective fluorescence quenching in the presence of copper(II), yet no fluorescence enhancement with zinc(II) as observed previously for the simple naphthalimide derivatives. Reasons for this different behaviour are proposed. Cytotoxicity testing shows that these new cyclam-triazole-dye conjugates display little or no toxicity against either DLD-1 colon carcinoma cells or MDA-MB-231 breast carcinoma cells, suggesting a potential role for these and related systems in biological sensing applications.
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Affiliation(s)
- Mingfeng Yu
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia
| | - Sandra Ast
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia
| | - Qun Yu
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia
| | - Anthony T. S. Lo
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia
| | - Roman Flehr
- Institute for Chemistry, University of Potsdam, Potsdam, Brandenburg, Germany
| | - Matthew H. Todd
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia
- * E-mail: (PJR); (MHT)
| | - Peter J. Rutledge
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia
- * E-mail: (PJR); (MHT)
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14
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Sun Q, Qian J, Tian H, Duan L, Zhang W. Rational design of biotinylated probes: fluorescent turn-on detection of (strept)avidin and bioimaging in cancer cells. Chem Commun (Camb) 2014; 50:8518-21. [DOI: 10.1039/c4cc03315a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yu M, Ryan TM, Ellis S, Bush AI, Triccas JA, Rutledge PJ, Todd MH. Neuroprotective peptide–macrocycle conjugates reveal complex structure–activity relationships in their interactions with amyloid β. Metallomics 2014; 6:1931-40. [DOI: 10.1039/c4mt00122b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Novel neuroprotective peptide–macrocycle conjugates exhibit complex, multifaceted structure–activity relationships in their interactions with amyloid β.
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Affiliation(s)
- Mingfeng Yu
- School of Chemistry
- The University of Sydney
- Sydney, Australia
| | - Timothy M. Ryan
- The Florey Institute of Neuroscience and Mental Health
- Parkville, Australia
| | - Samantha Ellis
- Sydney Medical School
- The University of Sydney
- Sydney, Australia
| | - Ashley I. Bush
- The Florey Institute of Neuroscience and Mental Health
- Parkville, Australia
| | | | | | - Matthew H. Todd
- School of Chemistry
- The University of Sydney
- Sydney, Australia
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Yu M, Lim NH, Ellis S, Nagase H, Triccas JA, Rutledge PJ, Todd MH. Incorporation of Bulky and Cationic Cyclam-Triazole Moieties into Marimastat Can Generate Potent MMP Inhibitory Activity without Inducing Cytotoxicity. ChemistryOpen 2013; 2:99-105. [PMID: 24551546 PMCID: PMC3703814 DOI: 10.1002/open.201300014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Indexed: 12/23/2022] Open
Abstract
The synthesis and matrix metalloproteinase (MMP) inhibitory activity of a cyclam-marimastat conjugate and its metal complexes are described. The conjugate, synthesized with a copper(I)-catalyzed Huisgen 1,3-dipolar cycloaddition ("click" reaction), contains two zinc-binding groups (ZBGs). The metal complexation behavior with copper(II) and zinc(II) was investigated using UV/Vis spectrophotometry and (1)H NMR spectroscopy, respectively, demonstrating that the first equivalent of the metal ion was chelated by the cyclam-triazole moiety rather than the hydroxamic acid site. Thus, the corresponding mononuclear metal-cyclam complexes were successfully prepared with one equivalent of the metal salt. Both the cyclam-marimastat conjugate and its metal complexes exhibited slightly reduced potency against MMP-1, but essentially identical inhibitory activity against MMP-3. The conjugate and its metal complexes displayed little or no cytotoxicity, further supporting their potential suitability for imaging MMP localization and activity. To the best of our knowledge, this is the first report that describes the incorporation of metal complexes into an MMP inhibitor without influencing the preexisting ZBG, and the first report of the evaluation of structures containing more than one ZBG as MMP inhibitors.
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Affiliation(s)
- Mingfeng Yu
- School of Chemistry, The University of Sydney Sydney, NSW 2006 (Australia)
| | - Ngee H Lim
- The Kennedy Institute of Rheumatology, University of Oxford 65 Aspenlea Road, London W6 8 LH (United Kingdom)
| | - Samantha Ellis
- Sydney Medical School, The University of Sydney Sydney, NSW 2006 (Australia)
| | - Hideaki Nagase
- The Kennedy Institute of Rheumatology, University of Oxford 65 Aspenlea Road, London W6 8 LH (United Kingdom)
| | - James A Triccas
- Sydney Medical School, The University of Sydney Sydney, NSW 2006 (Australia)
| | - Peter J Rutledge
- School of Chemistry, The University of Sydney Sydney, NSW 2006 (Australia)
| | - Matthew H Todd
- School of Chemistry, The University of Sydney Sydney, NSW 2006 (Australia)
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Royal Australian Chemical Institute National Awards / WATOC Schrödinger Medal: S. Grimme / Vice-President of the Académie des Sciences: B. Meunier / Rutherford Medal, MacDiarmid Medal, and Hector Medal: M. Brimble. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/anie.201301002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Royal Australian Chemical Institute National Awards / WATOC-Schrödinger-Medaille: S. Grimme / / Vizepräsident der Académie des Sciences: B. Meunier / Rutherford-Medaille, MacDiarmid-Medaille und Hector-Medaille: M. Brimble. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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