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Tran VT, Turek-Herman J, Ferreira M, Martin KN, Beseiso D, Williams BR, Rosu F, Gabelica V, Burgmayer SJN, Yatsunyk LA. Interactions of ruthenium(II) polypyridyl complexes with human telomeric DNA. J Inorg Biochem 2023; 249:112388. [PMID: 37837940 PMCID: PMC10668861 DOI: 10.1016/j.jinorgbio.2023.112388] [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: 05/12/2023] [Revised: 09/12/2023] [Accepted: 09/24/2023] [Indexed: 10/16/2023]
Abstract
Eight [Ru(bpy)2L]2+ and three [Ru(phen)2L]2+complexes (where bpy = 2,2'-bipyridine and phen = 1,10-phenanthroline are ancillary ligands, and L = a polypyridyl experimental ligand) were investigated for their G-quadruplex binding abilities. Fluorescence resonance energy transfer melting assays were used to screen these complexes for their ability to selectively stabilize human telomeric DNA variant, Tel22. The best G-quadruplex stabilizers were further characterized for their binding properties (binding constant and stoichiometry) using UV-vis, fluorescence spectroscopy, and mass spectrometry. The ligands' ability to alter the structure of Tel22 was determined via circular dichroism and PAGE studies. We identified me2allox as the experimental ligand capable of conferring excellent stabilizing ability and good selectivity to polypyridyl Ru(II) complexes. Replacing bpy by phen did not significantly impact interactions with Tel22, suggesting that binding involves mostly the experimental ligand. However, using a particular ancillary ligand can help fine-tune G-quadruplex-binding properties of Ru(II) complexes. Finally, the fluorescence "light switch" behavior of all Ru(II) complexes in the presence of Tel22 G-quadruplex was explored. All Ru(II) complexes displayed "light switch" properties, especially [Ru(bpy)2(diamino)]2+, [Ru(bpy)2(dppz)]2+, and [Ru(bpy)2(aap)]2+. Current work sheds light on how Ru(II) polypyridyl complexes interact with human telomeric DNA with possible application in cancer therapy or G-quadruplex sensing.
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Affiliation(s)
- Vienna T Tran
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Ave., Swarthmore, PA, USA.
| | - Joshua Turek-Herman
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Ave., Swarthmore, PA, USA.
| | - Michelle Ferreira
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Ave., Swarthmore, PA, USA.
| | - Kailey N Martin
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Ave., Swarthmore, PA, USA.
| | - Dana Beseiso
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Ave., Swarthmore, PA, USA.
| | | | - Frederic Rosu
- Univ. Bordeaux, CNRS, INSERM, IECB, UAR3033, US01, F-33600 Pessac, France.
| | - Valérie Gabelica
- Univ. Bordeaux, CNRS, INSERM, IECB, UAR3033, US01, F-33600 Pessac, France; Univ. Bordeaux, CNRS, INSERM, ARNA, UMR5320, U1212, IECB, F-33600 Pessac, France.
| | | | - Liliya A Yatsunyk
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Ave., Swarthmore, PA, USA.
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2
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Stitch M, Avagliano D, Graczyk D, Clark IP, González L, Towrie M, Quinn SJ. Good Vibrations Report on the DNA Quadruplex Binding of an Excited State Amplified Ruthenium Polypyridyl IR Probe. J Am Chem Soc 2023; 145:21344-21360. [PMID: 37736878 PMCID: PMC10557146 DOI: 10.1021/jacs.3c06099] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Indexed: 09/23/2023]
Abstract
The nitrile containing Ru(II)polypyridyl complex [Ru(phen)2(11,12-dCN-dppz)]2+ (1) is shown to act as a sensitive infrared probe of G-quadruplex (G4) structures. UV-visible absorption spectroscopy reveals enantiomer sensitive binding for the hybrid htel(K) and antiparallel htel(Na) G4s formed by the human telomer sequence d[AG3(TTAG3)3]. Time-resolved infrared (TRIR) of 1 upon 400 nm excitation indicates dominant interactions with the guanine bases in the case of Λ-1/htel(K), Δ-1/htel(K), and Λ-1/htel(Na) binding, whereas Δ-1/htel(Na) binding is associated with interactions with thymine and adenine bases in the loop. The intense nitrile transient at 2232 cm-1 undergoes a linear shift to lower frequency as the solution hydrogen bonding environment decreases in DMSO/water mixtures. This shift is used as a sensitive reporter of the nitrile environment within the binding pocket. The lifetime of 1 in D2O (ca. 100 ps) is found to increase upon DNA binding, and monitoring of the nitrile and ligand transients as well as the diagnostic DNA bleach bands shows that this increase is related to greater protection from the solvent environment. Molecular dynamics simulations together with binding energy calculations identify the most favorable binding site for each system, which are in excellent agreement with the observed TRIR solution study. This study shows the power of combining the environmental sensitivity of an infrared (IR) probe in its excited state with the TRIR DNA "site effect" to gain important information about the binding site of photoactive agents and points to the potential of such amplified IR probes as sensitive reporters of biological environments.
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Affiliation(s)
- Mark Stitch
- School
of Chemistry, University College Dublin, Dublin, D04 V1W8, Ireland
| | - Davide Avagliano
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währingerstr. 19, 1090 Vienna, Austria
- Department
of Chemistry, Chemical Physics Theory Group, University of Toronto, 80 St. George St., Toronto, Ontario M5S 3H6, Canada
| | - Daniel Graczyk
- School
of Chemistry, University College Dublin, Dublin, D04 V1W8, Ireland
| | - Ian P. Clark
- Central
Laser Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, U.K.
| | - Leticia González
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währingerstr. 19, 1090 Vienna, Austria
- Vienna
Research Platform on Accelerating Photoreaction Discovery, University of Vienna, Währingerstr. 19, 1090 Vienna, Austria
| | - Michael Towrie
- Central
Laser Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, U.K.
| | - Susan J Quinn
- School
of Chemistry, University College Dublin, Dublin, D04 V1W8, Ireland
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Ghosh S, De D, Banerjee V, Biswas S, Ghosh U. High throughput screening of a new fluorescent G-quadruplex ligand having telomerase inhibitory activity in human A549 cells. NUCLEOSIDES, NUCLEOTIDES & NUCLEIC ACIDS 2023:1-22. [PMID: 36919622 DOI: 10.1080/15257770.2023.2188220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
Identification of a new G-quadruplex ligand having anti-telomerase activity would be a promising strategy for cancer therapy. The screened compound from ZINC database using docking studies was experimentally verified for its binding with three different telomeric G-quadruplex DNA sequences and anti-telomerase activity in A549 cells. Identified compound is an intrinsic fluorescent molecule, permeable to live cells and has a higher affinity to 22AG out of three different telomeric G-quadruplex DNA. It showed cytotoxicity and a significant reduction of telomerase activity in human A549 cells at a very low dose. So, this compound has a good anti-cancer effect.
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Affiliation(s)
- Sourav Ghosh
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani, India
| | - Debapriya De
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani, India
| | - Victor Banerjee
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani, India
| | - Soumyajit Biswas
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani, India
| | - Utpal Ghosh
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani, India
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Holden L, Gkika KS, Burke CS, Long C, Keyes TE. Selective, Disruptive Luminescent Ru(II) Polypyridyl Probes of G-Quadruplex. Inorg Chem 2023; 62:2213-2227. [PMID: 36703307 PMCID: PMC9906756 DOI: 10.1021/acs.inorgchem.2c03903] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Sensors capable of transducing G-quadruplex DNA binding are important both in solution and for imaging and interrogation in cellulo. Ru(II)-based light switches incorporating dipyridylphenazine (dppz) ligands are effective probes for recognition and imaging of DNA and its polymorphs including G-quadruplex, although selectivity is a limitation. While the majority of Ru(II)-based light switches reported to date, stabilize the quadruplex, imaging/theranostic probes that can disrupt G4s are of potentially enormous value in study and therapy for a range of disease states. We report here, on a Ru(II) complex (Ru-PDC3) that assembles the light switch capability of a Ru(II) dipyridylphenazine complex with the well-known G4-selective ligand Phen-DC3, into a single structure. The complex shows the anticipated light switch effect and strong affinity for G4 structures. Affinity depended on the G4 topology and sequence, but across all structures bar one, it was roughly an order of magnitude greater than for duplex or single-stranded DNA. Moreover, photophysical and Raman spectral data showed clear discrimination between duplex DNA and G4-bound structures offering the prospect of discrimination in imaging as well as in solution. Crucially, unlike the constituent components of the probe, Ru-PDC3 is a powerful G4 disrupter. From circular dichroism (CD), a reduction of ellipticity of the G4 between 70 and 95% was observed depending on topology and in many cases was accompanied by an induced CD signal for the metal complex. The extent of change in ellipticity is amongst the largest reported for small-molecule ligand G4 binding. While a promising G4 probe, without modification, the complex is fully water-soluble and readily permeable to live cells.
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5
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Jiang J, Teunens T, Tisaun J, Denuit L, Moucheron C. Ruthenium(II) Polypyridyl Complexes and Their Use as Probes and Photoreactive Agents for G-quadruplexes Labelling. Molecules 2022; 27:1541. [PMID: 35268640 PMCID: PMC8912042 DOI: 10.3390/molecules27051541] [Citation(s) in RCA: 3] [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: 01/27/2022] [Revised: 02/21/2022] [Accepted: 02/22/2022] [Indexed: 02/01/2023] Open
Abstract
Due to their optical and electrochemical properties, ruthenium(II) polypyridyl complexes have been used in a wide array of applications. Since the discovery of the light-switch ON effect of [Ru(bpy)2dppz]2+ when interacting with DNA, the design of new Ru(II) complexes as light-up probes for specific regions of DNA has been intensively explored. Amongst them, G-quadruplexes (G4s) are of particular interest. These structures formed by guanine-rich parts of DNA and RNA may be associated with a wide range of biological events. However, locating them and understanding their implications in biological pathways has proven challenging. Elegant approaches to tackle this challenge relies on the use of photoprobes capable of marking, reversibly or irreversibly, these G4s. Indeed, Ru(II) complexes containing ancillary π-deficient TAP ligands can create a covalently linked adduct with G4s after a photoinduced electron transfer from a guanine residue to the excited complex. Through careful design of the ligands, high selectivity of interaction with G4 structures can be achieved. This allows the creation of specific Ru(II) light-up probes and photoreactive agents for G4 labelling, which is at the core of this review composed of an introduction dedicated to a brief description of G-quadruplex structures and two main sections. The first one will provide a general picture of ligands and metal complexes interacting with G4s. The second one will focus on an exhaustive and comprehensive overview of the interactions and (photo)reactions of Ru(II) complexes with G4s.
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Affiliation(s)
- Julie Jiang
- Laboratoire de Chimie Organique et Photochimie, Service de Chimie et PhysicoChimie Organiques, Université Libre de Bruxelles, Avenue F. D. Roosevelt 50-CP 160/08, 1050 Brussels, Belgium; (J.J.); (T.T.); (J.T.); (L.D.)
| | - Titouan Teunens
- Laboratoire de Chimie Organique et Photochimie, Service de Chimie et PhysicoChimie Organiques, Université Libre de Bruxelles, Avenue F. D. Roosevelt 50-CP 160/08, 1050 Brussels, Belgium; (J.J.); (T.T.); (J.T.); (L.D.)
- Laboratoire de Chimie des Matériaux Nouveaux, Université de Mons, Place du Parc 20, 7000 Mons, Belgium
| | - Jérôme Tisaun
- Laboratoire de Chimie Organique et Photochimie, Service de Chimie et PhysicoChimie Organiques, Université Libre de Bruxelles, Avenue F. D. Roosevelt 50-CP 160/08, 1050 Brussels, Belgium; (J.J.); (T.T.); (J.T.); (L.D.)
| | - Laura Denuit
- Laboratoire de Chimie Organique et Photochimie, Service de Chimie et PhysicoChimie Organiques, Université Libre de Bruxelles, Avenue F. D. Roosevelt 50-CP 160/08, 1050 Brussels, Belgium; (J.J.); (T.T.); (J.T.); (L.D.)
| | - Cécile Moucheron
- Laboratoire de Chimie Organique et Photochimie, Service de Chimie et PhysicoChimie Organiques, Université Libre de Bruxelles, Avenue F. D. Roosevelt 50-CP 160/08, 1050 Brussels, Belgium; (J.J.); (T.T.); (J.T.); (L.D.)
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6
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Fluorescent functional nucleic acid: Principles, properties and applications in bioanalyzing. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116292] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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7
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Conformational rearrangements of G-quadruplex topology promoted by Cu(II) 12-MC Cu(II)PyrAcHA-4 metallacrown. Int J Biol Macromol 2019; 156:1258-1269. [PMID: 31759020 DOI: 10.1016/j.ijbiomac.2019.11.163] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 11/20/2022]
Abstract
Cu(II) 12-MCCu(II)PyrAcHA-4 metallacrown was studied by several spectroscopic techniques as an interacting ligand with G-quadruplex DNA structures. Investigations were performed on oligonucleotides bearing human telomeric and protooncogenic c-myc sequences in buffered solution mimicking ionic conditions in cellular environment. The planar square-based Cu(II) 12-MC-4 metallacrown interacts with GQ via an end-stacking mode with 1:1 stoichiometry. Circular dichroism (CD) titration revealed capability of this metallacrown to induce transformation of the GQ hybrid topology into the parallel form. Thermal melting experiment indicated higher thermal stability of both antiparallel (ΔTm = +15 °C) and parallel (ΔTm = ≥27 °C) G-quadruplexes in the presence of Cu (II) 12-MC-4. Indirect GQ FID assay let to determine high binding affinity of the Cu(II) 12-MC-4 to antiparallel 22Htel/Na+ GQ (KMC = 3.9 (±0.4) x 106 M-1). Comparing with lower binding constants previously reported for Ln (III) 15-MC-5 and Sm (III) 12-MC-4, one can conclude that the square planar geometry and the positive charge of metallacrown play an important role in MC/GQ interactions.
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8
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Wumaier M, Shi JJ, Yao TM, Hu XC, Gao RR, Shi S. G-quadruplex and duplex DNA binding studies of novel Ruthenium(II) complexes containing ascididemin ligands. J Inorg Biochem 2019; 196:110681. [DOI: 10.1016/j.jinorgbio.2019.03.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Revised: 03/22/2019] [Accepted: 03/27/2019] [Indexed: 11/29/2022]
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9
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Mandal P, Sahoo D, Saha S, Chowdhury J. Sensing of Different Human Telomeric G-Quadruplex DNA Topologies by Natural Alkaloid Allocryptopine Using Spectroscopic Techniques. J Phys Chem B 2018; 122:10279-10290. [PMID: 30346761 DOI: 10.1021/acs.jpcb.8b07856] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Paulami Mandal
- Department of Physics, Jadavpur University, 188, Raja S. C. Mallick Road, Kolkata, West Bengal 700032, India
| | - Dibakar Sahoo
- School of Physics, Sambalpur University, Jyoti Vihar, Burla, Odisha 768 019, India
| | - Saumen Saha
- Department of Physics, Jadavpur University, 188, Raja S. C. Mallick Road, Kolkata, West Bengal 700032, India
| | - Joydeep Chowdhury
- Department of Physics, Jadavpur University, 188, Raja S. C. Mallick Road, Kolkata, West Bengal 700032, India
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10
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Rubio‐Magnieto J, Kajouj S, Di Meo F, Fossépré M, Trouillas P, Norman P, Linares M, Moucheron C, Surin M. Binding Modes and Selectivity of Ruthenium Complexes to Human Telomeric DNA G‐Quadruplexes. Chemistry 2018; 24:15577-15588. [DOI: 10.1002/chem.201802147] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 07/12/2018] [Indexed: 02/05/2023]
Affiliation(s)
- Jenifer Rubio‐Magnieto
- Laboratory for Chemistry of Novel Materials Center for Innovation in Materials and Polymers University of Mons-UMONS 20 Place du Parc 7000 Mons Belgium
- Current address: Bioinspired Supramolecular Chemistry and Materials group Departament de Química Inorgànica i Orgànica Universitat Jaume I Avda Sos Baynat s/n E-12071 Castelló Spain
| | - Sofia Kajouj
- Chimie Organique et Photochimie CP160/08 Université libre de Bruxelles 50 avenue F. D. Roosevelt 1050 Bruxelles Belgium
| | - Florent Di Meo
- INSERM U1248 IPPRITT University of Limoges School of Pharmacy 2 rue du Dr. Marcland 87025 Limoges France
| | - Mathieu Fossépré
- Laboratory for Chemistry of Novel Materials Center for Innovation in Materials and Polymers University of Mons-UMONS 20 Place du Parc 7000 Mons Belgium
| | - Patrick Trouillas
- INSERM U1248 IPPRITT University of Limoges School of Pharmacy 2 rue du Dr. Marcland 87025 Limoges France
- RCPTM Palacký University Faculty of Sciences Šlechtitelů 27 78371 Olomouc Czech Republic
| | - Patrick Norman
- Department of Theoretical Chemistry and Biology School of Engineering Sciences in Chemistry Biotechnology and Health KTH Royal Institute of Technology SE-106 91 Stockholm Sweden
| | - Mathieu Linares
- Department of Theoretical Chemistry and Biology School of Engineering Sciences in Chemistry Biotechnology and Health KTH Royal Institute of Technology SE-106 91 Stockholm Sweden
- Swedish e-Science Research Centre (SeRC) KTH Royal Institute of Technology 104 50 Stockholm Sweden
| | - Cécile Moucheron
- Chimie Organique et Photochimie CP160/08 Université libre de Bruxelles 50 avenue F. D. Roosevelt 1050 Bruxelles Belgium
| | - Mathieu Surin
- Laboratory for Chemistry of Novel Materials Center for Innovation in Materials and Polymers University of Mons-UMONS 20 Place du Parc 7000 Mons Belgium
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11
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A dinuclear ruthenium(II) complex as an inducer and potential luminescent switch-on probe for G-quadruplex DNA. TRANSIT METAL CHEM 2018. [DOI: 10.1007/s11243-018-0240-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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12
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Saha U, Yasmeen Khan A, Bhuiya S, Das S, Fiorillo G, Lombardi P, Suresh Kumar G. Targeting human telomeric DNA quadruplex with novel berberrubine derivatives: insights from spectroscopic and docking studies. J Biomol Struct Dyn 2018; 37:1375-1389. [DOI: 10.1080/07391102.2018.1459319] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Urmila Saha
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India
| | - Asma Yasmeen Khan
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India
| | - Sutanwi Bhuiya
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Suman Das
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Gaetano Fiorillo
- Naxospharma srl, Via G. Di Vittorio, 70, 20026 Novate Milanese, MI, Italy
| | - Paolo Lombardi
- Naxospharma srl, Via G. Di Vittorio, 70, 20026 Novate Milanese, MI, Italy
| | - Gopinatha Suresh Kumar
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India
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13
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Novel Naphthalimide Derivatives as Selective G-Quadruplex DNA Binders. Appl Biochem Biotechnol 2018; 186:547-562. [PMID: 29671192 DOI: 10.1007/s12010-018-2749-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 03/25/2018] [Indexed: 01/08/2023]
Abstract
A new derivate of 4-bromo-1,8-naphthalic anhydride and its quaternized analogue have been prepared and characterized. The interactions of both derivatives with human telomere quadruplex-DNA and ds-DNA have been comparatively studied by UV-visible (UV-Vis), fluorescent intercalator displacement assays, competition dialysis, circular dichroism (CD), agarose gel electrophoresis, and polyacrylamide gel electrophoresis. The results show that both derivatives can stabilize G-quadruplexes DNA, and they show different binding affinities for G-quadruplexes-DNA and ds-DNA. All spectroscopic studies have shown that the derivatives have a modest selectivity for G-quadruplex versus ds-DNA.
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14
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Zhang S, Wu Q, Zhang H, Wang Q, Wang X, Mei W, Wu X, Zheng W. Microwave-assisted synthesis of ruthenium(II) complexes with alkynes as potential inhibitor by selectively recognizing c-myc G-quadruplex DNA. J Inorg Biochem 2017; 176:113-122. [PMID: 28888786 DOI: 10.1016/j.jinorgbio.2017.08.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 07/11/2017] [Accepted: 08/05/2017] [Indexed: 11/20/2022]
Abstract
Herein, two polypyridyl ruthenium(II) complexes with alkynes, [Ru(bpy)2L](ClO4)2 (L=p-TEPIP (1) and p-BEPIP (2); bpy=2,2'-bipyridine; p-TEPIP=2-(4-trimethylsilylpropargyl)-1H-imidazo[4,5f][1,10]phenanthroline; p-BEPIP=2-(4-phenyacetylenephenyl)-1H-imidazo[4,5f][1,10]phenanthroline) have been successfully achieved in yields of 32%-89% by a Sonogashira coupling reaction under microwave irradiation. We studied these complexes as potential stabilizers of c-myc G-quadruplex DNA. Observations revealed that both complexes could selectively bind to and stabilize c-myc G-quadruplex DNA with a constant of approximately 1.61±0.78 and 9.47±4.20×103M-1, respectively, as determined from ITC (isothermal ttitration calorimetry) experiments, FRET (fluorescence resonance energy ttransfer) assay and competitive FRET assay. Moreover, the melting point (Tm) of the c-myc G-quadruplex DNA increased in the presence of 1 and 2 ([Ru]=0.2μM) by approximately 9 and 19.9°C, respectively. It is noteworthy that the conformation of the c-myc G-quadruplex DNA appeared to change when titrated with 1 and 2, which was accompanied by a negative-induced CD (circular dichroism) signal that appeared at a wavelength of 295nm. Furthermore, the conformational change in c-myc G-quadruplex DNA induced by 1 and 2have also been confirmed by TEM (transmission electron microscopy) and AFM (atomic force microscopy). Consequently, the replication of c-myc DNA was blocked by 1 and 2, and especially by 2, as verified by PCR (polymerase chain reaction) -stop assay and Western-blot assay. Thus, these ruthenium(II) complexes can be developed as potential inhibitors in chemotherapy through their binding and stabilization of c-myc G-quadruplex DNA.
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Affiliation(s)
- Shuangyan Zhang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Qiong Wu
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China; Department of Chemistry, Jinan University, Guangzhou 510632, China
| | - Hao Zhang
- The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou 510080, China
| | - Qi Wang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Xicheng Wang
- The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou 510080, China.
| | - Wenjie Mei
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China.
| | - Xiaohui Wu
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Wenjie Zheng
- Department of Chemistry, Jinan University, Guangzhou 510632, China
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15
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Zhao XL, Zhao HQ, Xu XX, Li ZS, Wang KZ. Inducement and stabilization of G-quadruplex DNA by a thiophene-containing dinuclear ruthenium(II) complex. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1322694] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Xiao-Long Zhao
- College of Chemistry & Environmental Science, Hebei University, Baoding, PR China
| | - Hua-Qian Zhao
- College of Chemistry & Environmental Science, Hebei University, Baoding, PR China
| | - Xue-Xue Xu
- College of Chemistry & Environmental Science, Hebei University, Baoding, PR China
| | - Zhen-Sheng Li
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, PR China
| | - Ke-Zhi Wang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, PR China
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16
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Wang X, Pei L, Fan X, Shi S. [Ru(L) 2 (3-tppp)] 2+ (L = bpy, phen) stabilizes two different forms of the human telomeric G-quadruplex DNA. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.07.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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17
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Mandal P, Bhattacharya M, Chowdhury J. Targeting G-quadruplex DNA and B-DNA with a natural alkaloid: a comparative spectroscopic study. RSC Adv 2016. [DOI: 10.1039/c6ra22776g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Different modes of binding of natural alkaloid harmine with G-quadruplex DNA and B-DNA: key roles in molecular recognition.
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Affiliation(s)
- Paulami Mandal
- Department of Biochemistry
- University of Calcutta
- Kolkata-700019
- India
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18
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Shi S, Gao X, Huang H, Zhao J, Yao T. Effect of the Ancillary Ligands on the Spectral Properties and G-Quadruplexes DNA Binding Behavior: A Combined Experimental and Theoretical Study. Chemistry 2015. [DOI: 10.1002/chem.201501830] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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19
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Shi S, Xu JH, Gao X, Huang HL, Yao TM. Binding Behaviors for Different Types of DNA G-Quadruplexes: Enantiomers of [Ru(bpy)2(L)](2+) (L=dppz, dppz-idzo). Chemistry 2015; 21:11435-45. [PMID: 26118412 DOI: 10.1002/chem.201501093] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Indexed: 11/11/2022]
Abstract
Polymorphic DNA G-quadruplex recognition has attracted great interest in recent years. The strong binding affinity and potential enantioselectivity of chiral [Ru(bpy)2 (L)](2+) (L=dipyrido[3,2-a:2',3'-c]phenazine, dppz-10,11-imidazolone; bpy=2,2'-bipyridine) prompted this investigation as to whether the two enantiomers, Δ and Λ, can show different effects on diverse structures with a range of parallel, antiparallel and mixed parallel/antiparallel G-quadruplexes. These studies provide a striking example of chiral-selective recognition of DNA G-quadruplexes. As for antiparallel (tel-Na(+)) basket G-quadruplex, the Λ enantiomers bind stronger than the Δ enantiomers. Moreover, the behavior reported here for both enantiomers stands in sharp contrast to B-DNA binding. The chiral selectivity toward mixed parallel/antiparallel (tel-K(+)) G-quadruplex of both compounds is weak. Different loop arrangements can change chiral complex selectivity for both antiparallel and mixed parallel/antiparallel G-quadruplex. Whereas both Δ and Λ isomers bind to parallel G-quadruplexes with comparable affinity, no appreciable stereoselective G-quadruplex binding of the isomers was observed. In addition, different binding stoichiometries and binding modes for Δ and Λ enantiomers were confirmed. The results presented here indicate that chiral selective G-quadruplex binding is not only related to G-quadruplex topology, but also to the sequence and the loop constitution.
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Affiliation(s)
- Shuo Shi
- Shanghai Key Laboratory of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai, 200092 (P.R. China).
| | - Jin-Hong Xu
- Shanghai Key Laboratory of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai, 200092 (P.R. China)
| | - Xing Gao
- Shanghai Key Laboratory of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai, 200092 (P.R. China)
| | - Hai-Liang Huang
- Shanghai Key Laboratory of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai, 200092 (P.R. China)
| | - Tian-Ming Yao
- Shanghai Key Laboratory of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai, 200092 (P.R. China).
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20
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Huang H, Shi S, Zheng X, Yao T. Sensitive detection for coralyne and mercury ions based on homo-A/T DNA by exonuclease signal amplification. Biosens Bioelectron 2015; 71:439-444. [PMID: 25950941 DOI: 10.1016/j.bios.2015.04.076] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 04/13/2015] [Accepted: 04/23/2015] [Indexed: 12/27/2022]
Abstract
Based on specific homo-A/T DNA binding properties, a strategy for coralyne and mercury ions detection was realised by exonuclease-aided signal amplification. Coralyne could specifically bind homo-A DNA and protect it from the hydrolysis of exonuclease I. The coralyne-protected DNA was subsequently used as a trigger strand to hydrolyze DNA2 in exonuclease-aided signal amplification process. Thiazole orange was used to quantify the remainder DNA2. Under the optimal condition, the fluorescence intensity was linearly proportional to the concentration of coralyne in the range of 0.2-100 nM with a limit of detection (LOD) of 0.31 nM, which presented the lowest LOD for coralyne among all reported. With homo-T and Hg(2+) taking the place of homo-A DNA and coralyne, respectively, the system could also be used for Hg(2+) detection. The experiments in real samples also showed good results. This method was label-free, low-cost, easy-operating and highly repeatable for the detection of coralyne and mercury ions. It could also be extended to detect various analytes, such as other metal ions, proteins and small molecules by using appropriate aptamers.
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Affiliation(s)
- Hailiang Huang
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, China
| | - Shuo Shi
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, China.
| | - Xuyue Zheng
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, China
| | - Tianming Yao
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, China.
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21
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Yu HJ, Zhao Y, Mo WJ, Hao ZF, Yu L. Ru-indoloquinoline complex as a selective and effective human telomeric G-quadruplex binder. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 132:84-90. [PMID: 24858349 DOI: 10.1016/j.saa.2014.04.160] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/26/2014] [Accepted: 04/28/2014] [Indexed: 06/03/2023]
Abstract
Indoloquinoline and its derivatives have been reported to be a kind of efficient G-quadruplex binder and have been found to interact preferentially to intramolecular G-quadruplex and inhibit telomerase activity in human K562 cells and SW620 cells. In contrast to indoloquinoline derivatives, much less is known about the metal complex based on indoloquinoline or its derivative. In this report, we studied the interaction of ruthenium complex [Ru(bpy)2(itatp)]2+ containing indoloquinoline moiety with human telomeric G-quadruplex DNA (Telo22) and c-myc G-quadruplex DNA (Pu27) by UV-visible (UV-Vis), fluorescence spectroscopy, fluorescent intercalator displacement (FID), thermal denaturation studies and CD spectroscopy. The results suggest that [Ru(bpy)2(itatp)]2+ displays a strong π-π stacking interaction with human telomeric G-quadruplex with a high binding constant (∼10(7) M(-1)), but just exhibits moderate binding affinity to c-myc G-quadruplex, thus showing significant selectivity to human telomeric G-quadruplex. The CD titration results indicate that [Ru(bpy)2(itatp)]2+ could effectively convert Telo22 into antiparallel G-quadruplex conformation, while in the c-myc G-quadruplex case, instead of promoting Pu27 to fold into G-quadruplex, [Ru(bpy)2(itatp)]2+ destroys the parallel G-quadruplex structure of Pu27.
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Affiliation(s)
- Hui-juan Yu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China.
| | - Ying Zhao
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Wei-jie Mo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Zhi-feng Hao
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Lin Yu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China.
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22
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Lu XH, Shi S, Yao JL, Gao X, Huang HL, Yao TM. Two structurally analogous ruthenium complexes as naked-eye and reversible molecular "light switch" for G-quadruplex DNA. J Inorg Biochem 2014; 140:64-71. [PMID: 25063909 DOI: 10.1016/j.jinorgbio.2014.07.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 07/07/2014] [Accepted: 07/07/2014] [Indexed: 11/30/2022]
Abstract
A pair of symmetrical furyl based ruthenium(II) complexes ([Ru(phen)2dpq-df](2+) (1) and [Ru(bpy)2dpq-df](2+) (2) (phen=1,10-phenanthroline, bpy=2,2'-bipyridine, dpq-df=dipyrido (3,2-a:2',3'-c) quinoxaline-difuran) have been prepared and characterized. The binding properties of both complexes toward G-quadruplex DNA have been investigated by fluorescence spectroscopy, UV-Vis spectroscopy, circular dichroism (CD), fluorescence resonance energy transfer (FRET) melting assays and molecular docking studies. The experimental results indicated that both Ru-complexes exhibited a remarkable "light switch" effect in the presence of hybrid G-quadruplex DNA. Interestingly, the "light switch" can be repeated off and on through the successive addition of Cu(2+) ions and EDTA, and all these behaviors can be observed even by the naked eyes. Moreover, FRET melting assay revealed that both complexes could be potential stabilizers for G-quadruplex architectures. The computational studies not only confirmed that the two complex molecules bound to one G-quadruplex DNA molecule, but also explained the "light switch" effect.
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Affiliation(s)
- Xiao-Hui Lu
- Department of Chemistry, Tongji University, Shanghai 200092, PR China
| | - Shuo Shi
- Department of Chemistry, Tongji University, Shanghai 200092, PR China.
| | - Jun-Liang Yao
- Department of Chemistry, Tongji University, Shanghai 200092, PR China
| | - Xing Gao
- Department of Chemistry, Tongji University, Shanghai 200092, PR China
| | - Hai-Liang Huang
- Department of Chemistry, Tongji University, Shanghai 200092, PR China
| | - Tian-Ming Yao
- Department of Chemistry, Tongji University, Shanghai 200092, PR China.
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23
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Cao Y, Shi S, Wang L, Yao J, Yao T. Ultrasensitive fluorescence detection of heparin based on quantum dots and a functional ruthenium polypyridyl complex. Biosens Bioelectron 2014; 55:174-9. [DOI: 10.1016/j.bios.2013.12.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 11/21/2013] [Accepted: 12/02/2013] [Indexed: 12/14/2022]
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24
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Synthesis and characterization of Cu(II)-based anticancer chemotherapeutic agent targeting topoisomerase Iα: In vitro DNA binding, pBR322 cleavage, molecular docking studies and cytotoxicity against human cancer cell lines. Eur J Med Chem 2014; 74:509-23. [PMID: 24508781 DOI: 10.1016/j.ejmech.2013.12.046] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 12/23/2013] [Accepted: 12/26/2013] [Indexed: 02/07/2023]
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25
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Pages BJ, Li F, Wormell P, Ang DL, Clegg JK, Kepert CJ, Spare LK, Danchaiwijit S, Aldrich-Wright JR. Synthesis and analysis of the anticancer activity of platinum(ii) complexes incorporating dipyridoquinoxaline variants. Dalton Trans 2014; 43:15566-75. [DOI: 10.1039/c4dt02133a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Platinum complexes incorporating variants of dpq were synthesised. Their DNA affinity and cytotoxicity were compared to complexes containing phen variants, revealing unexpected trends in biological activity.
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Affiliation(s)
- Benjamin J. Pages
- Nanoscale Organisation and Dynamics Group
- University of Western Sydney
- Penrith South DC, Australia
- School of Science and Health
- University of Western Sydney
| | - Feng Li
- Nanoscale Organisation and Dynamics Group
- University of Western Sydney
- Penrith South DC, Australia
- School of Science and Health
- University of Western Sydney
| | - Paul Wormell
- School of Science and Health
- University of Western Sydney
- Penrith, Australia
| | - Dale L. Ang
- Nanoscale Organisation and Dynamics Group
- University of Western Sydney
- Penrith South DC, Australia
- School of Science and Health
- University of Western Sydney
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- St Lucia, Australia
| | | | - Lawson K. Spare
- Nanoscale Organisation and Dynamics Group
- University of Western Sydney
- Penrith South DC, Australia
- School of Science and Health
- University of Western Sydney
| | - Supawich Danchaiwijit
- Nanoscale Organisation and Dynamics Group
- University of Western Sydney
- Penrith South DC, Australia
- School of Science and Health
- University of Western Sydney
| | - Janice R. Aldrich-Wright
- Nanoscale Organisation and Dynamics Group
- University of Western Sydney
- Penrith South DC, Australia
- School of Science and Health
- University of Western Sydney
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26
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Targeting human telomeric G-quadruplex DNA and inhibition of telomerase activity with [(dmb)2Ru(obip)Ru(dmb)2](4+). PLoS One 2013; 8:e84419. [PMID: 24386376 PMCID: PMC3874006 DOI: 10.1371/journal.pone.0084419] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 11/14/2013] [Indexed: 11/19/2022] Open
Abstract
Inhibition of telomerase by inducing/stabilizing G-quadruplex formation is a promising strategy to design new anticancer drugs. We synthesized and characterized a new dinuclear complex [(dmb)2Ru(obip)Ru(dmb)2]4+ (dmb = 4,4’-dimethyl-2,2’-bipyridine, obip = (2-(2-pyridyl)imidazo[4,5-f][1,10]phenanthroline) with high affinity for both antiparallel and mixed parallel / antiparallel G-quadruplex DNA. This complex can promote the formation and stabilize G-quadruplex DNA. Dialysis and TRAP experiments indicated that [(dmb)2Ru(obip)Ru(dmb)2]4+ acted as an excellent telomerase inhibitor due to its obvious selectivity for G-quadruplex DNA rather than double stranded DNA. In vitro co-culture experiments implied that [(dmb)2Ru(obip)Ru(dmb)2]4+ inhibited telomerase activity and hindered cancer cell proliferation without side effects to normal fibroblast cells. TUNEL assay indicated that inhibition of telomerase activity induced DNA cleavage further apoptosis in cancer cells. Therefore, RuII complex represents an exciting opportunity for anticancer drug design by specifically targeting cancer cell G-quadruplexes DNA.
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27
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Nielsen MC, Larsen AF, Abdikadir FH, Ulven T. Phenanthroline-2,9-bistriazoles as selective G-quadruplex ligands. Eur J Med Chem 2013; 72:119-26. [PMID: 24361524 DOI: 10.1016/j.ejmech.2013.11.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 11/17/2013] [Accepted: 11/25/2013] [Indexed: 02/09/2023]
Abstract
G-quadruplex (G4) ligands are currently receiving considerable attention as potential anticancer therapeutics. A series of phenanthroline-2,9-bistriazoles carrying tethered positive end groups has been synthesized and evaluated as G4 stabilizers. The compounds were efficiently assembled by copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) in CH2Cl2 and water in the presence of a complexing agent. Characterization of the target compounds on telomeric and c-KIT G4 sequences led to the identification of guanidinium-substituted compounds as potent G4 DNA ligands with high selectivity over duplex DNA. The diisopropylguanidium ligands exhibited high selectivity for the proto-oncogenic sequence c-KIT over the human telomeric sequence in the surface plasmon resonance (SPR) assay, whereas the compounds appeared potent on both G4 structures in the FRET melting temperature assay. The phenanthroline-2,9-bistriazole ligands were thus identified as potent G4 ligands with high selectivity over duplex DNA, and preliminary results indicate that the scaffold may form basis for the development of subtype-specific G4 ligands.
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Affiliation(s)
- Mads Corvinius Nielsen
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Anders Foller Larsen
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Faisal Hussein Abdikadir
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Trond Ulven
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark.
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28
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Gan GL, Chao H, Cai XP, Jiang ZS, Li H. Condensation and salt-induced decondensation of DNA upon incorporation of a V-shaped luminescent [Ru2(bpy)4(mbpibH2)]4+. J Inorg Biochem 2013; 129:9-14. [DOI: 10.1016/j.jinorgbio.2013.07.041] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 07/30/2013] [Accepted: 07/30/2013] [Indexed: 12/13/2022]
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29
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Shi S, Wang X, Sun W, Wang X, Yao T, Ji L. Label-free fluorescent DNA biosensors based on metallointercalators and nanomaterials. Methods 2013; 64:305-14. [DOI: 10.1016/j.ymeth.2013.07.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 07/07/2013] [Indexed: 10/26/2022] Open
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30
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Jiang GB, Xie YY, Lin GJ, Huang HL, Liang ZH, Liu YJ. Synthesis, characterization, DNA interaction, antioxidant and anticancer activity studies of ruthenium(II) polypyridyl complexes. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2013; 129:48-56. [DOI: 10.1016/j.jphotobiol.2013.09.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 09/26/2013] [Accepted: 09/27/2013] [Indexed: 01/25/2023]
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31
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Fujita H, Imaizumi Y, Kasahara Y, Kitadume S, Ozaki H, Kuwahara M, Sugimoto N. Structural and affinity analyses of g-quadruplex DNA aptamers for camptothecin derivatives. Pharmaceuticals (Basel) 2013; 6:1082-93. [PMID: 24276420 PMCID: PMC3818834 DOI: 10.3390/ph6091082] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 08/11/2013] [Accepted: 08/26/2013] [Indexed: 01/13/2023] Open
Abstract
We recently selected DNA aptamers that bind to camptothecin (CPT) and CPT derivatives from a 70-mer oligodeoxyribonucleotide (ODN) library using the Systematic Evolution of Ligands by EXponential enrichment (SELEX) method. The target-binding activity of the obtained 70-mer CPT-binding DNA aptamer, termed CA-70, which contains a 16-mer guanine (G)-core motif (G3TG3TG3T2G3) that forms a three-tiered G-quadruplex, was determined using fluorescence titration. In this study, truncated fragments of CA-70 that all have the G-core motif, CA-40, -20, -19, -18A, -18B, -17, and -16, were carefully analyzed. We found that CA-40 retained the target-binding activity, whereas CA-20, -19, and -18B exhibited little or no binding activities. Further, not only CA-18A but also the shorter length fragments CA-17 and -16 clearly retained the binding activity, indicating that tail strands of the G-quadruplex structure can significantly affect the target binding of G-quadruplex DNA aptamers. Further analyses using circular dichroism (CD) spectroscopy and fluorescence polarization (FP) assay were conducted to investigate the structure and affinity of G-quadruplex DNA aptamers.
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Affiliation(s)
- Hiroto Fujita
- Graduate School of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
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