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Nagaraj K, Priyanshi J, Govindasamy C, Sivakumar AS, Kamalesu S, Naman J, Dixitkumar M, Lokhandwala S, Parekh NM, Radha S, Uthra C, Vaishnavi E, Sakthinathan S, Chiu TW, Karuppiah C. Effect of hydrophobicity and size of the ligands on the intercalative binding interactions of some metallo-surfactants containing π-conjugated systems with yeast tRNA. J Biomol Struct Dyn 2024; 42:3949-3957. [PMID: 37254288 DOI: 10.1080/07391102.2023.2216783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 05/16/2023] [Indexed: 06/01/2023]
Abstract
The intercalative yeast t-RNA binding behavior of some metallo-surfactant complexes, Co(ip)2(TA)2](ClO4)3 (1) and [Co(dpq)2(TA)2](ClO4)3 (2) where TA = Tetradecylamine (Myristylamine), ip = imidazo[4,5-f][1,10]phenanthroline and dpq = dipyrido[3,2-d:2'-3'-f]quinoxaline containing π-conjugated systems (both below and above critical micelle concentration) have been investigated by means of absorption spectral titration, competitive binding, circular dichroism, cyclic voltammetry, and viscometry measurements. Absorption spectral titration results implicate yeast tRNA has significant effects on the binding behaviors of two surfactant complexes via intercalative mode showed a significant absorption band of hypochromicity with red shift. The intrinsic binding constant values below and above CMC were determined as Kb = 6.12 × 105 M-1, 2.31 × 106 M-1, for complex (1) and 7.23 × 105 M-1, 3.57 × 106 M-1, for complex (2). In both sets of complexes (1) and (2), the complexes bind more strongly to yeast tRNA in the above critical micelle concentration can be hydrophobic and confirm intercalation. Competitive displacement studies confirmed that complexes bind to yeast tRNA via intercalative mode. Cyclic voltammetry studies suggest the increasing amounts of yeast tRNA, the cathodic potential Epc for the two complexes shows a positive shift in peak potential indicated the process of binding via intercalation. These observations were further validated by CD, and hydrodynamic measurements. All these studies suggesting that a surfactant complex binds to yeast tRNA appear to be mainly intercalative because of hydrophobicity due to extending aromaticity of the π system of the ligand and planarity of the complex has a significant effect on tRNA binding affinity increasing in the order of complexes containing ligands ip < dpq.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Karuppiah Nagaraj
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Jigeshkumar Priyanshi
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Chandramohan Govindasamy
- Department of Community Health Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Allur Subramaniyan Sivakumar
- Department of Orthopaedic Surgery, Dongtan Sacred Heart Hospital, Hallym University, College of Medicine, Hwaseong, Republic of Korea
| | - Supramanium Kamalesu
- Department of Chemistry, University of Science, Chandigarh University, Gharuan, India
| | - Jitendrabhai Naman
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Manojkumar Dixitkumar
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Snehal Lokhandwala
- Department of Environmental Science & Technology, UPL University of Sustainable Technology, Vataria, India
| | - Nikhil M Parekh
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Suriyan Radha
- Department of Chemistry, Saiva Bhanu Kshatriya College, Aruppukkottai, India
| | - Chandrabose Uthra
- Department of Microbiology, Bharathidasan University, Tiruchirapalli, India
| | - Ellappan Vaishnavi
- Department of Chemistry, Sri GVG Visalakshi College for Women, Udumalpet, India
| | - Subramanian Sakthinathan
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan, ROC
| | - Te-Wei Chiu
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan, ROC
| | - Chelladurai Karuppiah
- Battery Research Center for Green Energy, Ming Chi University of Technology, New Taipei City, Taiwan, ROC
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Miranda TG, Ciribelli NN, Bihain MFR, Santos Pereira AKD, Cavallini GS, Pereira DH. Interactions between DNA and the acridine intercalator: A computational study. Comput Biol Chem 2024; 109:108029. [PMID: 38387123 DOI: 10.1016/j.compbiolchem.2024.108029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 02/08/2024] [Accepted: 02/08/2024] [Indexed: 02/24/2024]
Abstract
Cancer is a global public health problem characterized by deviations in the mechanisms that control cell proliferation, resulting in mutations and variations in the structure of DNA. The mechanisms of action of chemotherapeutic drugs are related to their interactions and binding with DNA; consequently, the development of antineoplastic agents that target DNA has extensively focused on use of acridine, a heterocyclic molecule that binds to deoxyribonucleic acid via intercalation, a process that modifies DNA and makes replication impossible. In this context, this study aimed to computationally investigate how acridine intercalators interact with DNA by evaluating the mechanism of interactions, binding, and interaction energies using quantum mechanics calculations. Molecular electrostatic potential (MEP) analysis revealed that acridine has well- distributed negative charges in the center of the molecule, indicative of a dominant electron-rich region. Acridine exhibits well-defined π orbitals (HOMO and LUMO) on the aromatic rings, suggesting that charge transfer occurs within the molecule and may be responsible for the pharmacological activity of the compound. Structural analysis revealed that acridine interacts with DNA mainly through hydrogen bonds between HAcridine… ODNA with bond lengths ranging from 2.370 Å to 3.472 Å. The Binding energy (ΔEBind) showed that acridine interacts with DNA effectively for all complexes and the electronic energy results (E+ZPE) for complexes revealed that the complexes are more stable when the DNA-centered acridine molecule. The Laplacian-analysis topological QTAIM parameter (∇2ρ(r)) and total energy (H(r)) categorized the interactions as being non-covalent in nature. The RGD peak distribution in the NCI analysis reveals the presence of van der Waals interactions, predominantly between the intercalator and DNA. Accordingly, we confirm that acridine/DNA interactions are relevant for understanding how the intercalator acts within nucleic acids.
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Affiliation(s)
- Thaynara Guimarães Miranda
- Programa de Pós Graduação em Biotecnologia, Universidade Federal do Tocantins (UFT), Gurupi, Tocantins CEP 77.402-970, Brazil
| | - Nicolas Nascimento Ciribelli
- Programa de Pós Graduação em Biotecnologia, Universidade Federal do Tocantins (UFT), Gurupi, Tocantins CEP 77.402-970, Brazil
| | | | - Anna Karla Dos Santos Pereira
- Programa de Pós Graduação em Química, Universidade Federal do Tocantins (UFT), Gurupi, Tocantins CEP 77.402-970, Brazil
| | - Grasiele Soares Cavallini
- Programa de Pós Graduação em Química, Universidade Federal do Tocantins (UFT), Gurupi, Tocantins CEP 77.402-970, Brazil
| | - Douglas Henrique Pereira
- Programa de Pós Graduação em Biotecnologia, Universidade Federal do Tocantins (UFT), Gurupi, Tocantins CEP 77.402-970, Brazil; Departamento de Química, Instituto Tecnológico de Aeronáutica (ITA), Praça Marechal Eduardo Gomes, 50, Vila das Acácias, São José dos Campos SP CEP 12228-900, Brazil.
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3
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Zhou J, Wang X, Jia M, He X, Pan H, Chen J. Ultrafast spectroscopy study of DNA photophysics after proflavine intercalation. J Chem Phys 2024; 160:124305. [PMID: 38526107 DOI: 10.1063/5.0194608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 03/06/2024] [Indexed: 03/26/2024] Open
Abstract
Proflavine (PF), an acridine DNA intercalating agent, has been widespread applied as an anti-microbial and topical antiseptic agent due to its ability to suppress DNA replication. On the other hand, various studies show that PF intercalation to DNA can increase photogenotoxicity and has potential chances to induce carcinomas of skin appendages. However, the effects of PF intercalation on the photophysical and photochemical properties of DNA have not been sufficiently explored. In this study, the excited state dynamics of the PF intercalated d(GC)9 • d(GC)9 and d(AT)9 • d(AT)9 DNA duplex are investigated in an aqueous buffer solution. Under 267 nm excitation, we observed ultrafast charge transfer (CT) between PF and d(GC)9 • d(GC)9 duplex, generating a CT state with an order of magnitude longer lifetime compared to that of the intrinsic excited state reported for the d(GC)9 • d(GC)9 duplex. In contrast, no excited state interaction was detected between PF and d(AT)9 • d(AT)9. Nevertheless, a localized triplet state with a lifetime over 5 µs was identified in the PF-d(AT)9 • d(AT)9 duplex.
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Affiliation(s)
- Jie Zhou
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Xueli Wang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Menghui Jia
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Xiaoxiao He
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Haifeng Pan
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Jinquan Chen
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
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Guneri D, Waller ZAE. Utility of intercalator displacement assays for screening of ligands for i-motif DNA structures. Methods Enzymol 2024; 695:221-232. [PMID: 38521586 DOI: 10.1016/bs.mie.2023.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2024]
Abstract
Cytosine rich sequences can form intercalated, i-motif DNA structures stabilized by hemi-protonated cytosine:cytosine base pairing. These sequences are often located in regulatory regions of genes such as promoters. Ligands targeting i-motif structures may provide potential leads for treatments for genetic disease. The focus on ligands interacting with i-motif DNA has been increasing in recent years. Here, we describe the fluorescent intercalator displacement (FID) assay using thiazole orange binding i-motif DNA and assess the binding affinity of a ligand to the i-motif DNA by displacing thiazole orange. This provides a time and cost-effective high throughput screening of ligands against secondary DNA structures for hit identification.
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Affiliation(s)
- Dilek Guneri
- School of Pharmacy, University College London, London, United Kingdom.
| | - Zoë A E Waller
- School of Pharmacy, University College London, London, United Kingdom.
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Kolbeck PJ, Tišma M, Analikwu BT, Vanderlinden W, Dekker C, Lipfert J. Supercoiling-dependent DNA binding: quantitative modeling and applications to bulk and single-molecule experiments. Nucleic Acids Res 2024; 52:59-72. [PMID: 38000393 PMCID: PMC10783501 DOI: 10.1093/nar/gkad1055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 10/02/2023] [Accepted: 10/27/2023] [Indexed: 11/26/2023] Open
Abstract
DNA stores our genetic information and is ubiquitous in applications, where it interacts with binding partners ranging from small molecules to large macromolecular complexes. Binding is modulated by mechanical strains in the molecule and can change local DNA structure. Frequently, DNA occurs in closed topological forms where topology and supercoiling add a global constraint to the interplay of binding-induced deformations and strain-modulated binding. Here, we present a quantitative model with a straight-forward numerical implementation of how the global constraints introduced by DNA topology modulate binding. We focus on fluorescent intercalators, which unwind DNA and enable direct quantification via fluorescence detection. Our model correctly describes bulk experiments using plasmids with different starting topologies, different intercalators, and over a broad range of intercalator and DNA concentrations. We demonstrate and quantitatively model supercoiling-dependent binding in a single-molecule assay, where we directly observe the different intercalator densities going from supercoiled to nicked DNA. The single-molecule assay provides direct access to binding kinetics and DNA supercoil dynamics. Our model has broad implications for the detection and quantification of DNA, including the use of psoralen for UV-induced DNA crosslinking to quantify torsional tension in vivo, and for the modulation of DNA binding in cellular contexts.
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Affiliation(s)
- Pauline J Kolbeck
- Department of Physics and Center for NanoScience, LMU Munich, Amalienstrasse 54, 80799 Munich, Germany
- Soft Condensed Matter and Biophysics, Department of Physics and Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC Utrecht, The Netherlands
| | - Miloš Tišma
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2629 HZ Delft, The Netherlands
| | - Brian T Analikwu
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2629 HZ Delft, The Netherlands
| | - Willem Vanderlinden
- Department of Physics and Center for NanoScience, LMU Munich, Amalienstrasse 54, 80799 Munich, Germany
- Soft Condensed Matter and Biophysics, Department of Physics and Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC Utrecht, The Netherlands
| | - Cees Dekker
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2629 HZ Delft, The Netherlands
| | - Jan Lipfert
- Department of Physics and Center for NanoScience, LMU Munich, Amalienstrasse 54, 80799 Munich, Germany
- Soft Condensed Matter and Biophysics, Department of Physics and Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC Utrecht, The Netherlands
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Chowdhary S, Raza A, Preeti, Kaur S, Anand A, Sharma AK, Kumar V. Isatin-indoloquinoxaline click adducts with a potential to overcome platinum-based drug-resistance in ovarian cancer. Bioorg Chem 2024; 142:106953. [PMID: 37925887 DOI: 10.1016/j.bioorg.2023.106953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 10/26/2023] [Accepted: 10/28/2023] [Indexed: 11/07/2023]
Abstract
Herein, a series of isatin tethered indolo[2,3-b]quinoxaline hybrids was synthesized by considering the pharmacophoric features of known DNA intercalators and topoisomerase II inhibitors. The anti-proliferative properties of the synthesized compounds were evaluated against ovarian cancer cell lines (SKOV-3 and Hey A8). Four of the compounds exhibited promising anti-proliferative activities, with one of them being 10-fold more potent than cisplatin against drug-resistant Hey A8 cells. Further investigations were carried out to determine the DNA intercalating affinities of the most active compounds as potential mechanisms for their anti-proliferative activities. ADMET in silico studies were performed to assess the physicochemical, pharmacokinetics, and toxicity parameters of active compounds. This study, to the best of our knowledge, is the first report on the potential of isatin-indoloquinoxaline hybrids as structural blueprints for the development of new DNA intercalators. Additionally, it explores their potential to circumvent platinum-based resistance in ovarian cancer.
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Affiliation(s)
| | - Asif Raza
- Department of Pharmacology, Penn State Cancer Institute, The Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Preeti
- Department of Chemistry, Guru Nanak Dev University, Amritsar, India
| | - Sukhmeet Kaur
- Department of Chemistry, Khalsa College, Amritsar, India
| | - Amit Anand
- Department of Chemistry, Khalsa College, Amritsar, India
| | - Arun K Sharma
- Department of Pharmacology, Penn State Cancer Institute, The Pennsylvania State University College of Medicine, Hershey, PA 17033, USA.
| | - Vipan Kumar
- Department of Chemistry, Guru Nanak Dev University, Amritsar, India.
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7
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Mirzakhanian A, Khoury M, Trujillo DE, Kim B, Ca D, Minehan T. DNA major versus minor groove occupancy of monomeric and dimeric crystal violet derivatives. Toward structural correlations. Bioorg Med Chem 2023; 94:117438. [PMID: 37757605 DOI: 10.1016/j.bmc.2023.117438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 08/05/2023] [Accepted: 08/07/2023] [Indexed: 09/29/2023]
Abstract
Six monomeric (1a-1f) and five dimeric (2a-2e) derivatives of the triphenylmethane dye crystal violet (CV) have been prepared. Evaluation of the binding of these compounds to CT DNA by competitive fluorescent intercalator displacement (FID) assays, viscosity experiments, and UV and CD spectroscopy suggest that monomeric derivative 1a and dimeric derivative 2d likely associate with the major groove of DNA, while dimeric derivatives 2a and 2e likely associate with the minor groove of DNA. Additional evidence for the groove occupancy assignments of these derivatives was obtained from ITC experiments and from differential inhibition of DNA cleavage by the major groove binding restriction enzyme BamHI, as revealed by agarose gel electrophoresis. The data indicate that major groove ligands may be optimally constructed from dye units containing a sterically bulky 3,5-dimethyl-N,N-dimethylaniline group; furthermore, the groove-selectivity of olefin-tethered dimer 2d suggests that stereoelectronic interactions (n → π*) between the ligand and DNA are also an important design consideration in the crafting of major-groove binding ligands.
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Affiliation(s)
- Aren Mirzakhanian
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330, USA
| | - Michael Khoury
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330, USA
| | - Donald E Trujillo
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330, USA
| | - Byoula Kim
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330, USA
| | - Donnie Ca
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330, USA
| | - Thomas Minehan
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, CA 91330, USA.
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Movahedi E, Razmazma H, Rezvani A, Nowroozi A, Ebrahimi A, Eigner V, Dusek M, Arjmand F. A novel Cu(II)-based DNA-intercalating agent: Structural and biological insights using biophysical and in silico techniques. Spectrochim Acta A Mol Biomol Spectrosc 2023; 293:122438. [PMID: 36758364 DOI: 10.1016/j.saa.2023.122438] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 01/14/2023] [Accepted: 02/01/2023] [Indexed: 06/18/2023]
Abstract
A new mixed-ligand Cu(II) complex formulated as [Cu(dipic)(amp)(H2O)].H2O (dipic: pyridine-2,6-dicarboxylic acid, amp: 2-amino-4-methylpyridine), was synthesized and structurally characterized by FTIR spectroscopy, CHN analysis, and the single-crystal X-ray crystallographic method. The complex crystallizes in an orthorhombic space group Pna21, and the coordination environment around the metal center was found to be a pentacoordinate CuN2O2OW distorted square-pyramidal geometry. In order to systematically explore a detailed in vitro and in silico study of the DNA binding of the title complex, various biophysical (UV-Vis absorption spectroscopy, fluorescence, competitive binding with ethidium bromide) and theoretical (DFT, molecular docking simulation, and QM/MM) methods were applied which revealed that the complex could intercalate with the insertion of the amp ligand between the DNA base pairs. The experimental thermodynamic parameters of the interaction revealed the spontaneity of the process and the domination of the hydrophobic interactions in the association and stabilization of the DNA-Cu(II) complex adduct, which was in line with the docking and QM/MM data. In vitro cytotoxic potential of the complex against the human breast adenocarcinoma (MCF-7) cells was examined using MTT assay, which indicated that cancerous cells showed inhibition in presence of the complex.
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Affiliation(s)
- Elaheh Movahedi
- Department of Chemistry, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran
| | - Hafez Razmazma
- Laboratory of Computational Quantum Chemistry and Drug Design, Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran
| | - Alireza Rezvani
- Department of Chemistry, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran.
| | - Alireza Nowroozi
- Department of Chemistry, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran.
| | - Ali Ebrahimi
- Laboratory of Computational Quantum Chemistry and Drug Design, Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran
| | - Vaclav Eigner
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221, Prague 8, Czech Republic
| | - Michal Dusek
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221, Prague 8, Czech Republic
| | - Farukh Arjmand
- Department of Chemistry, Aligarh Muslim University, Aligarh, UP 202002, India
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Jabak AA, Bryden N, Westerlund F, Lincoln P, McCauley MJ, Rouzina I, Williams MC, Paramanathan T. Left versus right: Exploring the effects of chiral threading intercalators using optical tweezers. Biophys J 2022; 121:3745-3752. [PMID: 35470110 PMCID: PMC9617076 DOI: 10.1016/j.bpj.2022.04.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/27/2022] [Accepted: 04/20/2022] [Indexed: 11/02/2022] Open
Abstract
Small-molecule DNA-binding drugs have shown promising results in clinical use against many types of cancer. Understanding the molecular mechanisms of DNA binding for such small molecules can be critical in advancing future drug designs. We have been exploring the interactions of ruthenium-based small molecules and their DNA-binding properties that are highly relevant in the development of novel metal-based drugs. Previously we have studied the effects of the right-handed binuclear ruthenium threading intercalator ΔΔ-[μ-bidppz(phen)4Ru2]4+, or ΔΔ-P for short, which showed extremely slow kinetics and high-affinity binding to DNA. Here we investigate the left-handed enantiomer ΛΛ-[μ-bidppz(phen)4Ru2]4+, or ΛΛ-P for short, to study the effects of chirality on DNA threading intercalation. We employ single-molecule optical trapping experiments to understand the molecular mechanisms and nanoscale structural changes that occur during DNA binding and unbinding as well as the association and dissociation rates. Despite the similar threading intercalation binding mode of the two enantiomers, our data show that the left-handed ΛΛ-P complex requires increased lengthening of the DNA to thread, and it extends the DNA more than double the length at equilibrium compared with the right-handed ΔΔ-P. We also observed that the left-handed ΛΛ-P complex unthreads three times faster than ΔΔ-P. These results, along with a weaker binding affinity estimated for ΛΛ-P, suggest a preference in DNA binding to the chiral enantiomer having the same right-handed chirality as the DNA molecule, regardless of their common intercalating moiety. This comparison provides a better understanding of how chirality affects binding to DNA and may contribute to the development of enhanced potential cancer treatment drug designs.
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Affiliation(s)
- Adam A Jabak
- Department of Physics, Photonics and Optical Engineering, Bridgewater State University, Bridgewater, Massachusetts
| | - Nicholas Bryden
- Department of Physics, Photonics and Optical Engineering, Bridgewater State University, Bridgewater, Massachusetts
| | - Fredrik Westerlund
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Per Lincoln
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Micah J McCauley
- Department of Physics, Northeastern University, Boston, Massachusetts
| | - Ioulia Rouzina
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio
| | - Mark C Williams
- Department of Physics, Northeastern University, Boston, Massachusetts.
| | - Thayaparan Paramanathan
- Department of Physics, Photonics and Optical Engineering, Bridgewater State University, Bridgewater, Massachusetts.
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Rykowski S, Gurda-Woźna D, Orlicka-Płocka M, Fedoruk-Wyszomirska A, Giel-Pietraszuk M, Wyszko E, Kowalczyk A, Stączek P, Biniek-Antosiak K, Rypniewski W, Olejniczak AB. Design of DNA Intercalators Based on 4-Carboranyl-1,8-Naphthalimides: Investigation of Their DNA-Binding Ability and Anticancer Activity. Int J Mol Sci 2022; 23:ijms23094598. [PMID: 35562989 PMCID: PMC9101373 DOI: 10.3390/ijms23094598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 04/12/2022] [Accepted: 04/19/2022] [Indexed: 11/24/2022] Open
Abstract
In the present study, we continue our work related to the synthesis of 1,8-naphthalimide and carborane conjugates and the investigation of their anticancer activity and DNA-binding ability. For this purpose, a series of 4-carboranyl-1,8-naphthalimide derivatives, mitonafide, and pinafide analogs were synthesized using click chemistry, reductive amination, amidation, and Mitsunobu reactions. The calf thymus DNA (ct-DNA)-binding properties of the synthesized compounds were investigated by circular dichroism (CD), UV–vis spectroscopy, and thermal denaturation experiments. Conjugates 54–61 interacted very strongly with ct-DNA (∆Tm = 7.67–12.33 °C), suggesting their intercalation with DNA. They were also investigated for their in vitro effects on cytotoxicity, cell migration, cell death, cell cycle, and production of reactive oxygen species (ROS) in a HepG2 cancer cell line as well as inhibition of topoisomerase IIα activity (Topo II). The cytotoxicity of these eight conjugates was in the range of 3.12–30.87 µM, with the lowest IC50 value determined for compound 57. The analyses showed that most of the conjugates could induce cell cycle arrest in the G0/G1 phase, inhibit cell migration, and promote apoptosis. Two conjugates, namely 60 and 61, induced ROS production, which was proven by the increased level of 2′-deoxy-8-oxoguanosine in DNA. They were specifically located in lysosomes, and because of their excellent fluorescent properties, they could be easily detected within the cells. They were also found to be weak Topo II inhibitors.
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Affiliation(s)
- Sebastian Rykowski
- Institute of Medical Biology, Polish Academy of Sciences, 106 Lodowa St., 93-232 Lodz, Poland;
| | - Dorota Gurda-Woźna
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 12/14 Z. Noskowskiego St., 61-704 Poznan, Poland; (D.G.-W.); (M.O.-P.); (A.F.-W.); (M.G.-P.); (E.W.); (K.B.-A.); (W.R.)
| | - Marta Orlicka-Płocka
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 12/14 Z. Noskowskiego St., 61-704 Poznan, Poland; (D.G.-W.); (M.O.-P.); (A.F.-W.); (M.G.-P.); (E.W.); (K.B.-A.); (W.R.)
| | - Agnieszka Fedoruk-Wyszomirska
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 12/14 Z. Noskowskiego St., 61-704 Poznan, Poland; (D.G.-W.); (M.O.-P.); (A.F.-W.); (M.G.-P.); (E.W.); (K.B.-A.); (W.R.)
| | - Małgorzata Giel-Pietraszuk
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 12/14 Z. Noskowskiego St., 61-704 Poznan, Poland; (D.G.-W.); (M.O.-P.); (A.F.-W.); (M.G.-P.); (E.W.); (K.B.-A.); (W.R.)
| | - Eliza Wyszko
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 12/14 Z. Noskowskiego St., 61-704 Poznan, Poland; (D.G.-W.); (M.O.-P.); (A.F.-W.); (M.G.-P.); (E.W.); (K.B.-A.); (W.R.)
| | - Aleksandra Kowalczyk
- Department of Molecular Microbiology, Faculty of Biology and Environmental Protection, University of Lodz, 12/16 Banacha St., 90-237 Lodz, Poland; (A.K.); (P.S.)
| | - Paweł Stączek
- Department of Molecular Microbiology, Faculty of Biology and Environmental Protection, University of Lodz, 12/16 Banacha St., 90-237 Lodz, Poland; (A.K.); (P.S.)
| | - Katarzyna Biniek-Antosiak
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 12/14 Z. Noskowskiego St., 61-704 Poznan, Poland; (D.G.-W.); (M.O.-P.); (A.F.-W.); (M.G.-P.); (E.W.); (K.B.-A.); (W.R.)
| | - Wojciech Rypniewski
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 12/14 Z. Noskowskiego St., 61-704 Poznan, Poland; (D.G.-W.); (M.O.-P.); (A.F.-W.); (M.G.-P.); (E.W.); (K.B.-A.); (W.R.)
| | - Agnieszka B. Olejniczak
- Institute of Medical Biology, Polish Academy of Sciences, 106 Lodowa St., 93-232 Lodz, Poland;
- Correspondence: ; Tel.: +48-42-272-36-37
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11
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Joaqui-Joaqui MA, Maxwell Z, Raju MVR, Jiang M, Srivastava K, Shao F, Arriaga EA, Pierre VC. Metallointercalators-DNA Tetrahedron Supramolecular Self-Assemblies with Increased Serum Stability. ACS Nano 2022; 16:2928-2941. [PMID: 35133785 PMCID: PMC8926058 DOI: 10.1021/acsnano.1c10084] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Self-assembly of metallointercalators into DNA nanocages is a rapid and facile approach to synthesize discrete bioinorganic host/guest structures with a high load of metal complexes. Turberfield's DNA tetrahedron can accommodate one intercalator for every two base pairs, which corresponds to 48 metallointercalators per DNA tetrahedron. The affinity of the metallointercalator for the DNA tetrahedron is a function of both the structure of the intercalating ligand and the overall charge of the complex, with a trend in affinity [Ru(bpy)2(dppz)]2+ > [Tb-DOTAm-Phen]3+ ≫ Tb-DOTA-Phen. Intercalation of the metal complex stabilizes the DNA tetrahedron, resulting in an increase of its melting temperature and, importantly, a significant increase in its stability in the presence of serum. [Ru(bpy)2(dppz)]2+, which has a greater affinity for DNA than [Tb-DOTAm-Phen]3+, increases the melting point and decreases degradation in serum to a greater extent than the TbIII complex. In the presence of Lipofectamine, the metallointercalator@DNA nanocage assemblies substantially increase the cell uptake of their respective metal complex. Altogether, the facile incorporation of a large number of metal complexes per assembly, the higher stability in serum, and the increased cell penetration of metallointercalator@DNA make these self-assemblies well-suited as metallodrugs.
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Affiliation(s)
- M. Andrey Joaqui-Joaqui
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, United States of America
| | - Zoe Maxwell
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, United States of America
| | | | - Min Jiang
- Zhejiang University-University of Illinois at Urbana-Champaign Institute, Zhejiang University, Haining, 314400, China
| | - Kriti Srivastava
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, United States of America
| | - Fangwei Shao
- Zhejiang University-University of Illinois at Urbana-Champaign Institute, Zhejiang University, Haining, 314400, China
| | - Edgar A. Arriaga
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, United States of America
| | - Valérie C. Pierre
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, United States of America
- Corresponding Author: Valérie C. Pierre - Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States of America;
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12
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Abstract
Major efforts have been devoted to the development of constructs that enable sequence-specific recognition of double-stranded (ds) DNA, fueled by the promise for enabling tools for applications in molecular biology, diagnostics, and medicine. Towards this end, we have previously introduced Invader probes, i.e., short DNA duplexes with +1 interstrand zipper arrangements of intercalator-functionalized nucleotides. The individual strands of these labile probes display high affinity towards complementary DNA (cDNA), which drives sequence-unrestricted dsDNA-recognition. However, recognition of long targets is challenging due to the high stability of the corresponding probes. To address this, we recently introduced toehold Invader probes, i.e., Invader probes with 5'-single-stranded overhangs. The toehold architecture allows for shorter double-stranded segments to be used, which facilitates probe dissociation and dsDNA-recognition. As an extension thereof, we here report the biophysical and dsDNA-targeting properties of nicked Invader probes. In this probe architecture, the single-stranded overhangs of toehold Invader probes are hybridized to short intercalator-modified auxiliary strands, leading to formation of additional labile segments. The extra binding potential from the auxiliary strands imparts nicked Invader probes with greater dsDNA-affinity than the corresponding toehold or blunt-ended probes. Recognition of chromosomal DNA targets, refractory to recognition by conventional Invader probes, is demonstrated for nicked Invader probes in the context of non-denaturing FISH experiments, which highlights their utility as dsDNA-targeting tools.
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Affiliation(s)
- Shiva P Adhikari
- Department of Chemistry, University of Idaho, Moscow, ID-83844, USA.
| | - Saswata Karmakar
- Department of Chemistry, University of Idaho, Moscow, ID-83844, USA.
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13
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Haldar S, Zhang Y, Xia Y, Islam B, Liu S, Gervasio FL, Mulholland AJ, Waller ZAE, Wei D, Haider S. Mechanistic Insights into the Ligand-Induced Unfolding of an RNA G-Quadruplex. J Am Chem Soc 2022; 144:935-950. [PMID: 34989224 DOI: 10.1021/jacs.1c11248] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The cationic porphyrin TMPyP4 is a well-established DNA G-quadruplex (G4) binding ligand that can stabilize different topologies via multiple binding modes. However, TMPyP4 can have both a stabilizing and destabilizing effect on RNA G4 structures. The structural mechanisms that mediate RNA G4 unfolding remain unknown. Here, we report on the TMPyP4-induced RNA G4 unfolding mechanism studied by well-tempered metadynamics (WT-MetaD) with supporting biophysical experiments. The simulations predict a two-state mechanism of TMPyP4 interaction via a groove-bound and a top-face-bound conformation. The dynamics of TMPyP4 stacking on the top tetrad disrupts Hoogsteen H-bonds between guanine bases, resulting in the consecutive TMPyP4 intercalation from top-to-bottom G-tetrads. The results reveal a striking correlation between computational and experimental approaches and validate WT-MetaD simulations as a powerful tool for studying RNA G4-ligand interactions.
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Affiliation(s)
- Susanta Haldar
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K
- D.E. Shaw India Private Ltd., Hyderabad, Telangana 500096, India
| | - Yashu Zhang
- State Key Laboratory of Agricultural Microbiology, College of Vetrinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Ying Xia
- UCL School of Pharmacy, University College London, London, WC1N 1AX, U.K
| | - Barira Islam
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, U.K
| | - Sisi Liu
- College of Science, Huazhong Agricultural University, Wuhan 430070, China
| | - Francesco L Gervasio
- Department of Chemistry, University College London, London, WC1H 0AJ, U.K
- Pharmaceutical Sciences, University of Geneva, Geneva CH-1211, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), Geneva CH-1211, Switzerland
| | | | - Zoë A E Waller
- UCL School of Pharmacy, University College London, London, WC1N 1AX, U.K
| | - Dengguo Wei
- State Key Laboratory of Agricultural Microbiology, College of Vetrinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
- National Reference Laboratory of Veterinary Drug Residues and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan 430070, China
- Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China
- Interdisciplinary Sciences Institute, Huazhong Agricultural University, Wuhan 430070, China
| | - Shozeb Haider
- UCL School of Pharmacy, University College London, London, WC1N 1AX, U.K
- UCL Centre for Advanced Research Computing, University College London, London, WC1H 9RN, U.K
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14
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Rodrigues ESB, de Macêdo IYL, Silva GNDME, de Carvalho e Silva A, Gil HPV, Neves BJ, Gil EDS. DNA-Based Electrodes and Computational Approaches on the Intercalation Study of Antitumoral Drugs. Molecules 2021; 26:molecules26247623. [PMID: 34946705 PMCID: PMC8709249 DOI: 10.3390/molecules26247623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 11/25/2021] [Accepted: 11/26/2021] [Indexed: 11/28/2022] Open
Abstract
The binding between anticancer drugs and double-stranded DNA (dsDNA) is a key issue to understand their mechanism of action, and many chemical methods have been explored on this task. Molecular docking techniques successfully predict the affinity of small molecules into the DNA binding sites. In turn, various DNA-targeted drugs are electroactive; in this regard, their electrochemical behavior may change according to the nature and strength of interaction with DNA. A carbon paste electrode (CPE) modified with calf thymus ds-DNA (CPDE) and computational methods were used to evaluate the drug–DNA intercalation of doxorubicin (DOX), daunorubicin (DAU), idarubicin (IDA), dacarbazine (DAR), mitoxantrone (MIT), and methotrexate (MTX), aiming to evaluate eventual correlations. CPE and CPDE were immersed in pH 7 0.1 mM solutions of each drug with different incubation times. As expected, the CPDE response for all DNA-targeted drugs was higher than that of CPE, evidencing the drug–DNA interaction. A peak current increase of up to 10-fold was observed; the lowest increase was seen for MTX, and the highest increase for MIT. Although this increase in the sensitivity is certainly tied to preconcentration effects of DNA, the data did not agree entirely with docking studies, evidencing the participation of other factors, such as viscosity, interfacial electrostatic interactions, and coefficient of diffusion.
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Affiliation(s)
- Edson Silvio Batista Rodrigues
- Lafam—Laboratory for Pharmaceutical and Environmental Analysis, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia 74605-170, Brazil; (E.S.B.R.); (I.Y.L.d.M.); (G.N.d.M.e.S.)
| | - Isaac Yves Lopes de Macêdo
- Lafam—Laboratory for Pharmaceutical and Environmental Analysis, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia 74605-170, Brazil; (E.S.B.R.); (I.Y.L.d.M.); (G.N.d.M.e.S.)
| | - Giovanna Nascimento de Mello e Silva
- Lafam—Laboratory for Pharmaceutical and Environmental Analysis, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia 74605-170, Brazil; (E.S.B.R.); (I.Y.L.d.M.); (G.N.d.M.e.S.)
| | - Arthur de Carvalho e Silva
- LabMol—Laboratory for Molecular Modeling and Drug Design, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia 74605-170, Brazil; (A.d.C.e.S.); (H.P.V.G.); (B.J.N.)
| | - Henric Pietro Vicente Gil
- LabMol—Laboratory for Molecular Modeling and Drug Design, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia 74605-170, Brazil; (A.d.C.e.S.); (H.P.V.G.); (B.J.N.)
| | - Bruno Junior Neves
- LabMol—Laboratory for Molecular Modeling and Drug Design, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia 74605-170, Brazil; (A.d.C.e.S.); (H.P.V.G.); (B.J.N.)
| | - Eric de Souza Gil
- Lafam—Laboratory for Pharmaceutical and Environmental Analysis, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia 74605-170, Brazil; (E.S.B.R.); (I.Y.L.d.M.); (G.N.d.M.e.S.)
- Correspondence:
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15
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Gong Y, Gu M, Yan M, Wang GL. Intercalated doxorubicin acting as stimulator of PbS photocathode for probing DNA-protein interactions. Mikrochim Acta 2021; 188:426. [PMID: 34812943 DOI: 10.1007/s00604-021-05103-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 11/10/2021] [Indexed: 11/25/2022]
Abstract
Label-free and turn-on DNA-binding protein detection based on the doxorubicin (Dox)-intercalated DNA as a signal stimulator in cathodic photoelectrochemistry is reported. The double-stranded DNA (dsDNA) acted as the matrix accommodating the intercalative Dox and allowed its effective photoelectrochemical (PEC) communication with the PbS quantum dots (QDs) for realizing cathodic photocurrent readout. In the presence of the target of the vascular endothelial growth factor (VEGF), the dsDNA was prevented from being digested by the exonuclease III (Exo III), allowing the anchor of Dox to perform as activation stimuli of the photocurrent. The VEGF can be detected in the linear range from 1.5 pM to 100 nM, with an impressively low detection limit of 0.49 pM. This study hints the prospect of DNA intercalated architectures as innovative signaling transduction elements for wide and versatile cathodic PEC bioassays. Effective signaling molecules that are conducive to probe-related cathodic PEC bioassays using DNA as the recognition or signification elements are scarce but very demanding. Herein, the doxorubicin intercalated in duplex DNA functions as an efficient signal stimulator of PbS-consisted photocathode, and thus hints the versatility of the strategy for various targets through cathodic photoelectrochemistry.
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Affiliation(s)
- Yuting Gong
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education), School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
| | - Mengmeng Gu
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education), School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
| | - Menghua Yan
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education), School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
| | - Guang-Li Wang
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education), School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China.
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16
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Maračić S, Grbčić P, Shammugam S, Radić Stojković M, Pavelić K, Sedić M, Kraljević Pavelić S, Raić-Malić S. Amidine- and Amidoxime-Substituted Heterocycles: Synthesis, Antiproliferative Evaluations and DNA Binding. Molecules 2021; 26:molecules26227060. [PMID: 34834151 PMCID: PMC8625065 DOI: 10.3390/molecules26227060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/16/2021] [Accepted: 11/19/2021] [Indexed: 11/29/2022] Open
Abstract
The novel 1,2,3-triazolyl-appended N- and O-heterocycles containing amidine 4–11 and amidoxime 12–22 moiety were prepared and evaluated for their antiproliferative activities in vitro. Among the series of amidine-substituted heterocycles, aromatic diamidine 5 and coumarine amidine 11 had the most potent growth-inhibitory effect on cervical carcinoma (HeLa), hepatocellular carcinoma (HepG2) and colorectal adenocarcinoma (SW620), with IC50 values in the nM range. Although compound 5 was toxic to non-tumor HFF cells, compound 11 showed certain selectivity. From the amidoxime series, quinoline amidoximes 18 and 20 showed antiproliferative effects on lung adenocarcinoma (A549), HeLa and SW620 cells emphasizing compound 20 that exhibited no cytostatic effect on normal HFF fibroblasts. Results of CD titrations and thermal melting experiments indicated that compounds 5 and 10 most likely bind inside the minor groove of AT-DNA and intercalate into AU-RNA. Compounds 6, 9 and 11 bind to AT-DNA with mixed binding mode, most probably minor groove binding accompanied with aggregate binding along the DNA backbone.
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Affiliation(s)
- Silvija Maračić
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia;
| | - Petra Grbčić
- Department of Biotechnology, University of Rijeka, Ulica Radmile Matejčić 2, HR-51000 Rijeka, Croatia;
| | - Suresh Shammugam
- Division of Organic Chemistry and Biochemistry, Laboratory for Biomolecular Interactions and Spectroscopy, Ruđer Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia;
| | - Marijana Radić Stojković
- Division of Organic Chemistry and Biochemistry, Laboratory for Biomolecular Interactions and Spectroscopy, Ruđer Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia;
- Correspondence: (M.R.S.); (S.R.-M.); Tel.: +385-1-4571220 (M.R.S.); +385-1-4597213 (S.R.-M.)
| | - Krešimir Pavelić
- Faculty of Medicine, Juraj Dobrila University of Pula, HR-52100 Pula, Croatia;
| | - Mirela Sedić
- Centre for Applied Bioanthropology, Institute for Anthropological Research, Ljudevita Gaja 32, HR-10000 Zagreb, Croatia;
| | - Sandra Kraljević Pavelić
- Faculty of Health Studies, University of Rijeka, Ulica Viktora Cara Emina 5, HR-51000 Rijeka, Croatia;
| | - Silvana Raić-Malić
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia;
- Correspondence: (M.R.S.); (S.R.-M.); Tel.: +385-1-4571220 (M.R.S.); +385-1-4597213 (S.R.-M.)
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17
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Hulleman CN, Thorsen RØ, Kim E, Dekker C, Stallinga S, Rieger B. Simultaneous orientation and 3D localization microscopy with a Vortex point spread function. Nat Commun 2021; 12:5934. [PMID: 34635658 PMCID: PMC8505439 DOI: 10.1038/s41467-021-26228-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 09/21/2021] [Indexed: 11/08/2022] Open
Abstract
Estimating the orientation and 3D position of rotationally constrained emitters with localization microscopy typically requires polarization splitting or a large engineered Point Spread Function (PSF). Here we utilize a compact modified PSF for single molecule emitter imaging to estimate simultaneously the 3D position, dipole orientation, and degree of rotational constraint from a single 2D image. We use an affordable and commonly available phase plate, normally used for STED microscopy in the excitation light path, to alter the PSF in the emission light path. This resulting Vortex PSF does not require polarization splitting and has a compact PSF size, making it easy to implement and combine with localization microscopy techniques. In addition to a vectorial PSF fitting routine we calibrate for field-dependent aberrations which enables orientation and position estimation within 30% of the Cramér-Rao bound limit over a 66 μm field of view. We demonstrate this technique on reorienting single molecules adhered to the cover slip, λ-DNA with DNA intercalators using binding-activated localization microscopy, and we reveal periodicity on intertwined structures on supercoiled DNA.
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Affiliation(s)
- Christiaan N Hulleman
- Department of Imaging Physics, Delft University of Technology, Delft, The Netherlands
| | - Rasmus Ø Thorsen
- Department of Imaging Physics, Delft University of Technology, Delft, The Netherlands
| | - Eugene Kim
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
- Max Planck Institute of Biophysics, 60438, Frankfurt, Germany
| | - Cees Dekker
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
| | - Sjoerd Stallinga
- Department of Imaging Physics, Delft University of Technology, Delft, The Netherlands.
| | - Bernd Rieger
- Department of Imaging Physics, Delft University of Technology, Delft, The Netherlands.
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18
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Hreusova M, Brabec V, Novakova O. Processing and Bypass of a Site-Specific DNA Adduct of the Cytotoxic Platinum-Acridinylthiourea Conjugate by Polymerases Involved in DNA Repair: Biochemical and Thermodynamic Aspects. Int J Mol Sci 2021; 22:ijms221910838. [PMID: 34639179 PMCID: PMC8509567 DOI: 10.3390/ijms221910838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/29/2021] [Accepted: 10/04/2021] [Indexed: 11/24/2022] Open
Abstract
DNA-dependent DNA and RNA polymerases are important modulators of biological functions such as replication, transcription, recombination, or repair. In this work performed in cell-free media, we studied the ability of selected DNA polymerases to overcome a monofunctional adduct of the cytotoxic/antitumor platinum–acridinylthiourea conjugate [PtCl(en)(L)](NO3)2 (en = ethane-1,2-diamine, L = 1-[2-(acridin-9-ylamino)ethyl]-1,3-dimethylthiourea) (ACR) in its favored 5′-CG sequence. We focused on how a single site-specific ACR adduct with intercalation potency affects the processivity and fidelity of DNA-dependent DNA polymerases involved in translesion synthesis (TLS) and repair. The ability of the G(N7) hybrid ACR adduct formed in the 5′-TCGT sequence of a 24-mer DNA template to inhibit the synthesis of a complementary DNA strand by the exonuclease-deficient Klenow fragment of DNA polymerase I (KFexo−) and human polymerases eta, kappa, and iota was supplemented by thermodynamic analysis of the polymerization process. Thermodynamic parameters of a simulated translesion synthesis across the ACR adduct were obtained by using microscale thermophoresis (MST). Our results show a strong inhibitory effect of an ACR adduct on enzymatic TLS: there was only small synthesis of a full-length product (less than 10%) except polymerase eta (~20%). Polymerase eta was able to most efficiently bypass the ACR hybrid adduct. Incorporation of a correct dCMP opposite the modified G residue is preferred by all the four polymerases tested. On the other hand, the frequency of misinsertions increased. The relative efficiency of misinsertions is higher than that of matched cytidine monophosphate but still lower than for the nonmodified control duplex. Thermodynamic inspection of the simulated TLS revealed a significant stabilization of successively extended primer/template duplexes containing an ACR adduct. Moreover, no significant decrease of dissociation enthalpy change behind the position of the modification can contribute to the enzymatic TLS observed with the DNA-dependent, repair-involved polymerases. This TLS could lead to a higher tolerance of cancer cells to the ACR conjugate compared to its enhanced analog, where thiourea is replaced by an amidine group: [PtCl(en)(L)](NO3)2 (complex AMD, en = ethane-1,2-diamine, L = N-[2-(acridin-9-ylamino)ethyl]-N-methylpropionamidine).
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Affiliation(s)
- Monika Hreusova
- Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, CZ 61265 Brno, Czech Republic; (M.H.); (V.B.)
| | - Viktor Brabec
- Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, CZ 61265 Brno, Czech Republic; (M.H.); (V.B.)
- Department of Biophysics, Faculty of Science, Palacky University, Slechtitelu 27, CZ 78371 Olomouc, Czech Republic
| | - Olga Novakova
- Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, CZ 61265 Brno, Czech Republic; (M.H.); (V.B.)
- Correspondence: ; Tel.: +420-541-517-135
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19
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Zhu L, Yu L, Yang X. Electrochemical-Based DNA Logic Devices Regulated by the Diffusion and Intercalation of Electroactive Dyes. ACS Appl Mater Interfaces 2021; 13:42250-42257. [PMID: 34452580 DOI: 10.1021/acsami.1c12650] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Electrochemical-based logic gates are simple to operate, sensitive, controllable, and easy to integrate with silicon-based semiconductor logic devices, showing great application prospects and remaining largely unexplored. Herein, an immobilization-free dual-output electrochemical molecular logic system based on the different diffusivity of electroactive dyes ferrocene (Fc) and methylene blue (MB) toward an indium tin oxide (ITO) electrode under different DNA hybridization reactions was developed. In this system, the hybridization of the catalytic strand IN1 with Fc-modified hairpin DNA H1 triggered an exonuclease III (Exo III) cleavage cycle to obtain free Fc and produce a large number of long double-stranded DNAs via the hybridization chain reaction for intercalating MB, which was previously in the free state. Such a hybridization reaction caused a significant change in the diffusion capacity of MB and Fc toward the ITO electrode, resulting in two electrochemical signals with opposite changes. On this basis, a contrary logic pair library, a parity generator/checker system for differentiating the erroneous bits during data transmission, a parity checker to identify the even/odd natural numbers from 0 to 9, and a series of concatenated logic circuits for meeting the needs of computational complexity were developed. The proposed electrochemical-based molecular logic system greatly expanded the application of the electrochemical method in the construction of logic circuits and provided a conceptual prototype for the development of more advanced and complicated logic devices.
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Affiliation(s)
- Liping Zhu
- University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Linying Yu
- University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China
| | - Xiurong Yang
- University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China
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20
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Buceta D, Dominguez B, Vieitez S, Arias IR, Ageitos JM, Blanco MC, Barone G, Domínguez F, López‐Quintela MA. A Simple Entropic-Driving Separation Procedure of Low-Size Silver Clusters, Through Interaction with DNA. ChemistryOpen 2021; 10:760-763. [PMID: 34351086 PMCID: PMC8340070 DOI: 10.1002/open.202100028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 07/01/2021] [Indexed: 11/07/2022] Open
Abstract
Synthesis and purification of metal clusters without strong binding agents by wet chemical methods are very attractive for their potential applications in many research areas. However, especially challenging is the separation of uncharged clusters with only a few number of atoms, which renders the usual techniques very difficult to apply. Herein, we report the first efficient separation of Ag2 and Ag3 clusters using the different entropic driving forces when such clusters interact with DNA, into which Ag3 selectively intercalates. After sequential dialysis of the samples and denaturalizing the DNA-Ag3 complex, pure Ag2 can be found in the dialysate after extensive dialysis. Free Ag3 is recovered after DNA denaturation.
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Affiliation(s)
- David Buceta
- Department of Physical ChemistryLab. Nanomag University of Santiago de Compostela15782Santiago de CompostelaSpain
| | - Blanca Dominguez
- Department of Physical ChemistryLab. Nanomag University of Santiago de Compostela15782Santiago de CompostelaSpain
| | - Sara Vieitez
- Department of Physical ChemistryLab. Nanomag University of Santiago de Compostela15782Santiago de CompostelaSpain
| | - Iria R. Arias
- Department of Physical ChemistryLab. Nanomag University of Santiago de Compostela15782Santiago de CompostelaSpain
| | - J. Manuel Ageitos
- Department of PharmacologyPharmacy and Pharmaceutical Technologyand Centro de Investigaciones en Medicina Molecular y Enfermedades Crónicas (CIMUS)University of Santiago de Compostela15782Santiago de CompostelaSpain
| | - M. Carmen Blanco
- Department of Physical ChemistryLab. Nanomag University of Santiago de Compostela15782Santiago de CompostelaSpain
| | - Giampaolo Barone
- Department of Biological, Chemical and Pharmaceutical Sciences and TechnologiesUniversity of Palermo90128PalermoItaly
| | - Fernando Domínguez
- Department of Physiology and Centro de Investigaciones en Medicina Molecular y Enfermedades Crónicas (CIMUS)University of Santiago de CompostelaE-15782Santiago de CompostelaSpain
| | - M. Arturo López‐Quintela
- Department of Physical ChemistryLab. Nanomag University of Santiago de Compostela15782Santiago de CompostelaSpain
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21
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Mikulin I, Ljubić I, Piantanida I, Vasilev A, Mondeshki M, Kandinska M, Uzelac L, Martin-Kleiner I, Kralj M, Tumir LM. Polycationic Monomeric and Homodimeric Asymmetric Monomethine Cyanine Dyes with Hydroxypropyl Functionality-Strong Affinity Nucleic Acids Binders. Biomolecules 2021; 11:biom11081075. [PMID: 34439741 PMCID: PMC8391988 DOI: 10.3390/biom11081075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/15/2021] [Accepted: 07/19/2021] [Indexed: 11/16/2022] Open
Abstract
New analogs of the commercial asymmetric monomethine cyanine dyes thiazole orange (TO) and thiazole orange homodimer (TOTO) with hydroxypropyl functionality were synthesized and their properties in the presence of different nucleic acids were studied. The novel compounds showed strong, micromolar and submicromolar affinities to all examined DNA ds-polynucleotides and poly rA-poly rU. The compounds studied showed selectivity towards GC-DNA base pairs over AT-DNA, which included both binding affinity and a strong fluorescence response. CD titrations showed aggregation along the polynucleotide with well-defined supramolecular chirality. The single dipyridinium-bridged dimer showed intercalation at low dye-DNA/RNA ratios. All new cyanine dyes showed potent micromolar antiproliferative activity against cancer cell lines, making them promising theranostic agents.
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Affiliation(s)
- Ivana Mikulin
- Laboratory for Biomolecular Interactions and Spectroscopy, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, P.O. Box 180, 10002 Zagreb, Croatia; (I.M.); (I.L.); (I.P.)
| | - Ivana Ljubić
- Laboratory for Biomolecular Interactions and Spectroscopy, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, P.O. Box 180, 10002 Zagreb, Croatia; (I.M.); (I.L.); (I.P.)
| | - Ivo Piantanida
- Laboratory for Biomolecular Interactions and Spectroscopy, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, P.O. Box 180, 10002 Zagreb, Croatia; (I.M.); (I.L.); (I.P.)
| | - Aleksey Vasilev
- Faculty of Chemistry and Pharmacy, Department of Pharmaceutical and Applied Organic Chemistry, Sofia University “St. Kliment Ohridski”, 1000 Sofia, Bulgaria;
- Correspondence: (A.V.); (L.-M.T.); Tel.: +359-98-836-6528 (A.V.); +385-1-457-1220 (L.-M.T.)
| | - Mihail Mondeshki
- Department of Chemistry, Johannes Gutenberg Universität Mainz, Duesbergweg 10–14, 55128 Mainz, Germany;
| | - Meglena Kandinska
- Faculty of Chemistry and Pharmacy, Department of Pharmaceutical and Applied Organic Chemistry, Sofia University “St. Kliment Ohridski”, 1000 Sofia, Bulgaria;
| | - Lidija Uzelac
- Laboratory of Experimental Therapy, Division of Molecular Medicine, Ruđer Bošković Institute, P.O. Box 180, 10002 Zagreb, Croatia; (L.U.); (I.M.-K.); (M.K.)
| | - Irena Martin-Kleiner
- Laboratory of Experimental Therapy, Division of Molecular Medicine, Ruđer Bošković Institute, P.O. Box 180, 10002 Zagreb, Croatia; (L.U.); (I.M.-K.); (M.K.)
| | - Marijeta Kralj
- Laboratory of Experimental Therapy, Division of Molecular Medicine, Ruđer Bošković Institute, P.O. Box 180, 10002 Zagreb, Croatia; (L.U.); (I.M.-K.); (M.K.)
| | - Lidija-Marija Tumir
- Laboratory for Biomolecular Interactions and Spectroscopy, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, P.O. Box 180, 10002 Zagreb, Croatia; (I.M.); (I.L.); (I.P.)
- Correspondence: (A.V.); (L.-M.T.); Tel.: +359-98-836-6528 (A.V.); +385-1-457-1220 (L.-M.T.)
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22
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Kucharska K, Pilz M, Bielec K, Kalwarczyk T, Kuźma P, Hołyst R. Two Intercalation Mechanisms of Oxazole Yellow Dimer (YOYO-1) into DNA. Molecules 2021; 26:molecules26123748. [PMID: 34205435 PMCID: PMC8234192 DOI: 10.3390/molecules26123748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/14/2021] [Accepted: 06/15/2021] [Indexed: 11/16/2022] Open
Abstract
The oxazole yellow dye, YOYO-1 (a symmetric homodimer), is a commonly used molecule for staining DNA. We applied the brightness analysis to study the intercalation of YOYO-1 into the DNA. We distinguished two binding modes of the dye to dsDNA: mono-intercalation and bis-intercalation. Bis-intercalation consists of two consecutive mono-intercalation steps, characterised by two distinct equilibrium constants (with the average number of base pair per binding site equals 3.5): K1=3.36±0.43×107M−1 and K2=1.90±0.61×105M−1, respectively. Mono-intercalation dominates at high concentrations of YOYO-1. Bis-intercalation occurs at low concentrations.
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23
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Hanczyc P, Rajchel-Mieldzioć P, Feng B, Fita P. Identification of Thioflavin T Binding Modes to DNA: A Structure-Specific Molecular Probe for Lasing Applications. J Phys Chem Lett 2021; 12:5436-5442. [PMID: 34080857 PMCID: PMC8280760 DOI: 10.1021/acs.jpclett.1c01254] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Accepted: 05/24/2021] [Indexed: 05/17/2023]
Abstract
The binding mechanism of thioflavin T (ThT) to DNA was studied using polarized light spectroscopy and fluorescence-based techniques in solutions and in solid films. Linear dichroism measurements showed that ThT binds to DNA duplex by intercalation. Time-resolved fluorescence studies revealed a second binding mode which is the external binding to the DNA phosphate groups. Both binding modes represent the nonspecific type of interactions. The studies were complemented with the analysis of short oligonucleotides having DNA cavities. The results indicate that the interplay between three binding modes-intercalation, external binding, and binding inside DNA cavities-determines the effective fluorescence quantum yield of the dye in the DNA structures. External binding was found to be responsible for fluorescence quenching because of energy transfer between intercalated and externally bound molecules. Finally, amplified spontaneous emission (ASE) was successfully generated in the ThT-stained films and used for detecting different DNA structures. ASE measurements show that ThT-stained DNA structures can be used for designing bioderived microlasers.
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Affiliation(s)
- P. Hanczyc
- Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - P. Rajchel-Mieldzioć
- Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - B. Feng
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, 412 96 Gothenburg, Sweden
| | - P. Fita
- Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
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24
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Saito GP, Matsumoto ACL, Assis RP, Brunetti IL, Cebim MA, Davolos MR. Zn(ferulate)-LSH Systems as Multifunctional Filters. Molecules 2021; 26:molecules26082349. [PMID: 33920742 PMCID: PMC8072700 DOI: 10.3390/molecules26082349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/28/2020] [Accepted: 12/29/2020] [Indexed: 12/03/2022] Open
Abstract
Excessive UV solar radiation exposure causes human health risks; therefore, the study of multifunctional filters is important to skin UV protective ability and also to other beneficial activities to the human organism, such as reduction of reactive oxygen species (ROS) responsible for cellular damages. Potential multifunctional filters were obtained by intercalating of ferulate anions into layered simple metal hydroxides (LSH) through anion exchange and precipitation at constant pH methods. Ultrasound treatment was used in order to investigate the structural changes in LSH-ferulate materials. Structural and spectroscopic analyses show the formation of layered materials composed by a mixture of LSH intercalated with ferulate anions, where carboxylate groups of ferulate species interact with LSH layers. UV-VIS absorption spectra and in vitro SPF measurements indicate that LSH-ferulate systems have UV shielding capacity, mainly UVB protection. The results of reactive species assays show the ability of layered compounds in capture DPPH•, ABTS•+, ROO•, and HOCl/OCl− reactive species. LSH-ferulate materials exhibit antioxidant activity and singular optical properties that enable their use as multifunctional filters.
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Affiliation(s)
- Gustavo Pereira Saito
- Institute of Chemistry, São Paulo State University (Unesp), Araraquara 14800-060, São Paulo, Brazil; (G.P.S.); (A.C.L.M.); (M.A.C.)
| | - Ana Carolina Lanfredi Matsumoto
- Institute of Chemistry, São Paulo State University (Unesp), Araraquara 14800-060, São Paulo, Brazil; (G.P.S.); (A.C.L.M.); (M.A.C.)
| | - Renata Pires Assis
- School of Pharmaceutical Sciences, São Paulo State University (Unesp), Araraquara 14800-903, São Paulo, Brazil; (R.P.A.); (I.L.B.)
| | - Iguatemy Lourenço Brunetti
- School of Pharmaceutical Sciences, São Paulo State University (Unesp), Araraquara 14800-903, São Paulo, Brazil; (R.P.A.); (I.L.B.)
| | - Marco Aurélio Cebim
- Institute of Chemistry, São Paulo State University (Unesp), Araraquara 14800-060, São Paulo, Brazil; (G.P.S.); (A.C.L.M.); (M.A.C.)
| | - Marian Rosaly Davolos
- Institute of Chemistry, São Paulo State University (Unesp), Araraquara 14800-060, São Paulo, Brazil; (G.P.S.); (A.C.L.M.); (M.A.C.)
- Correspondence: ; Tel.: +55-016-33019634
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25
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Scoditti S, Dabbish E, Sicilia E. Is the cytotoxic activity of phenanthriplatin dependent on the specific size of the phenanthridine ligand π system? J Inorg Biochem 2021; 219:111447. [PMID: 33798829 DOI: 10.1016/j.jinorgbio.2021.111447] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/04/2021] [Accepted: 03/24/2021] [Indexed: 12/12/2022]
Abstract
The monofunctional Pt(II) drug phenanthriplatin is a leading preclinical anticancer drug, whose main characteristic is the presence of the extended aromatic system of the phenanthridine ligand, which allows intercalation. Intercalation, in turn, induces DNA unwinding and facilitates DNA binding. Aiming at verifying to what extent the peculiar cytotoxic activity of phenanthriplatin depends on the specific size of the aromatic system, two phenanthriplatin derivatives have been designed increasing the number of the rings in the N-heterocyclic ligand, and their reactivity has been computationally investigated. Both quantum mechanical DFT computations and molecular dynamics (MD) simulations have been employed to investigate some of the aspects that are considered important for the activity of Pt(II) monofunctional complexes. In particular, the substitution of the chlorido ligand with water, subsequent interaction of the aquated complexes with guanine as a model, eventual deactivation by the model N-acetyl methionine as well as intercalation into, binding to and distortion of DNA have been examined. The outcomes of such analysis have been compared with the analogous ones for the phenanthriplatin complex in order to highlight how the addition of one more ring to the phenanthridine ligand and, eventually, its identity influence the reactivity and, consequently, the cytotoxic profile of the complexes.
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Affiliation(s)
- Stefano Scoditti
- Department of Chemistry and Chemical Technologies, Università della Calabria, 87036 Arcavacata di Rende (CS), Italy
| | - Eslam Dabbish
- Department of Chemistry and Chemical Technologies, Università della Calabria, 87036 Arcavacata di Rende (CS), Italy.
| | - Emilia Sicilia
- Department of Chemistry and Chemical Technologies, Università della Calabria, 87036 Arcavacata di Rende (CS), Italy.
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26
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Glover SA, Schumacher RR. Mutagenicity of N-acyloxy-N-alkoxyamides as an indicator of DNA intercalation: The role of fluorene and fluorenone substituents as DNA intercalators. Mutat Res Genet Toxicol Environ Mutagen 2021; 863-864:503299. [PMID: 33678240 DOI: 10.1016/j.mrgentox.2020.503299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 11/18/2020] [Accepted: 11/19/2020] [Indexed: 06/12/2023]
Abstract
N-Acyloxy-N-alkoxyamides are direct-acting mutagens in S. typhimurium TA100 and TA98. A reliable QSAR for their activity in TA100 has been developed, which indicates reversible intercalation into the DNA helix through naphthalene substituents. In this paper, we show that fluorene as a substituent does not facilitate intercalation while fluorenone does, although the efficacy is determined by the position of substitution on the fluorenone as well as the N-acyloxy-N-alkoxyamide side chain. Where intercalation is evident, the increased binding to DNA is similar to that of naphthalene and is worth the equivalent of ca four LogP hydrophobicity units. 4-Substituted fluorenones, where the anomeric amide group is in the bay region do not intercalate, which is attributed to the requirement for a weaker edge-on, rather than an end-on intercalation. Mutagencity in S. typhimurium TA98, which detects frame shifts through intercalation, supports the findings. Fluorene appears not to intercalate, which points to the fact that the charge delocalised 2-fluorenylnitrenium ion, the ultimate metabolite from 2-aminofluorene (AF) and 2-acetylaminofluorene (AAF) is the itercalating agent responsible for frameshift mutations leading to their carcinogenicity.
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Affiliation(s)
- Stephen A Glover
- Chemistry Department, School of Science and Technology, University of New England, Armidale, New South Wales 2351, Australia.
| | - Rhiannon R Schumacher
- Chemistry Department, School of Science and Technology, University of New England, Armidale, New South Wales 2351, Australia
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27
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González-González E, Lara-Mayorga IM, Rodríguez-Sánchez IP, Zhang YS, Martínez-Chapa SO, Santiago GTD, Alvarez MM. Colorimetric loop-mediated isothermal amplification (LAMP) for cost-effective and quantitative detection of SARS-CoV-2: the change in color in LAMP-based assays quantitatively correlates with viral copy number. Anal Methods 2021; 13:169-178. [PMID: 33399137 DOI: 10.1039/d0ay01658f] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We demonstrate a loop-mediated isothermal amplification (LAMP) method to detect and amplify SARS-CoV-2 genetic sequences using a set of in-house designed initiators that target regions encoding the N protein. We were able to detect and amplify SARS-CoV-2 nucleic acids in the range of 62 to 2 × 105 DNA copies by this straightforward method. Using synthetic SARS-CoV-2 samples and RNA extracts from patients, we demonstrate that colorimetric LAMP is a quantitative method comparable in diagnostic performance to RT-qPCR (i.e., sensitivity of 92.85% and specificity of 81.25% in a set of 44 RNA extracts from patients analyzed in a hospital setting).
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Affiliation(s)
- Everardo González-González
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico. and Departamento de Bioingeniería, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico
| | - Itzel Montserrat Lara-Mayorga
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico. and Departamento de Ingeniería Mecátrónica y Eléctrica, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico
| | - Iram Pablo Rodríguez-Sánchez
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Laboratorio de Fisiología Molecular y Estructural, 66455, San Nicolás de los Garza, NL, Mexico and Alfa Medical Center, Guadalupe, CP 67100, NL, Mexico
| | - Yu Shrike Zhang
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge 02139, MA, USA
| | - Sergio O Martínez-Chapa
- Departamento de Ingeniería Mecátrónica y Eléctrica, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico
| | - Grissel Trujillo-de Santiago
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico. and Departamento de Ingeniería Mecátrónica y Eléctrica, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico
| | - Mario Moisés Alvarez
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico. and Departamento de Bioingeniería, Tecnologico de Monterrey, CP 64849, Monterrey, NL, Mexico
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28
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Pocock EE, Mandle RJ, Goodby JW. Experimental and Computational Study of a Liquid Crystalline Dimesogen Exhibiting Nematic, Twist-Bend Nematic, Intercalated Smectic, and Soft Crystalline Mesophases. Molecules 2021; 26:532. [PMID: 33498518 PMCID: PMC7864162 DOI: 10.3390/molecules26030532] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 01/18/2021] [Accepted: 01/19/2021] [Indexed: 11/16/2022] Open
Abstract
Liquid crystalline dimers and dimesogens have attracted significant attention due to their tendency to exhibit twist-bend modulated nematic (NTB) phases. While the features that give rise to NTB phase formation are now somewhat understood, a comparable structure-property relationship governing the formation of layered (smectic) phases from the NTB phase is absent. In this present work, we find that by selecting mesogenic units with differing polarities and aspect ratios and selecting an appropriately bent central spacer we obtain a material that exhibits both NTB and intercalated smectic phases. The higher temperature smectic phase is assigned as SmCA based on its optical textures and X-ray scattering patterns. A detailed study of the lower temperature smectic ''X'' phase by optical microscopy and SAXS/WAXS demonstrates this phase to be smectic, with an in-plane orthorhombic or monoclinic packing and long (>100 nm) out of plane correlation lengths. This phase, which has been observed in a handful of materials to date, is a soft-crystal phase with an anticlinic layer organisation. We suggest that mismatching the polarities, conjugation and aspect ratios of mesogenic units is a useful method for generating smectic forming dimesogens.
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Affiliation(s)
- Emily E. Pocock
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK;
| | - Richard J. Mandle
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK;
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
| | - John W. Goodby
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK;
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29
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Hadwiger LA. Nonhost Disease Resistance in Pea: Chitosan's Suggested Role in DNA Minor Groove Actions Relative to Phytoalexin-Eliciting Anti-Cancer Compounds. Molecules 2020; 25:E5913. [PMID: 33327391 PMCID: PMC7764892 DOI: 10.3390/molecules25245913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/09/2020] [Accepted: 12/11/2020] [Indexed: 11/16/2022] Open
Abstract
A stable intense resistance called "nonhost resistance" generates a complete multiple-gene resistance against plant pathogenic species that are not pathogens of pea such as the bean pathogen, Fusarium solani f. sp. phaseoli (Fsph). Chitosan is a natural nonhost resistance response gene activator of defense responses in peas. Chitosan may share with cancer-treatment compounds, netropsin and some anti-cancer drugs, a DNA minor groove target in plant host tissue. The chitosan heptamer and netropsin have the appropriate size and charge to reside in the DNA minor groove. The localization of a percentage of administered radio-labeled chitosan in the nucleus of plant tissue in vivo indicates its potential to transport to site(s) within the nuclear chromatin (1,2). Other minor groove-localizing compounds administered to pea tissue activate the same secondary plant pathway that terminates in the production of the anti-fungal isoflavonoid, pisatin an indicator of the generated resistance response. Some DNA minor groove compounds also induce defense genes designated as "pathogenesis-related" (PR) genes. Hypothetically, DNA targeting components alter host DNA in a manner enabling the transcription of defense genes previously silenced or minimally expressed. Defense-response-elicitors can directly (a) target host DNA at the site of transcription or (b) act by a series of cascading events beginning at the cell membrane and indirectly influence transcription. A single defense response, pisatin induction, induced by chitosan and compounds with known DNA minor groove attachment potential was followed herein. A hypothesis is formulated suggesting that this DNA target may be accountable for a portion of the defense response generated in nonhost resistance.
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Affiliation(s)
- Lee A Hadwiger
- Department of Plant Pathology, Washington State University, Pullman, WA 99164-6430, USA
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30
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Tokala R, Sana S, Lakshmi UJ, Sankarana P, Sigalapalli DK, Gadewal N, Kode J, Shankaraiah N. Design and synthesis of thiadiazolo-carboxamide bridged β-carboline-indole hybrids: DNA intercalative topo-IIα inhibition with promising antiproliferative activity. Bioorg Chem 2020; 105:104357. [PMID: 33091673 PMCID: PMC7543778 DOI: 10.1016/j.bioorg.2020.104357] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 09/03/2020] [Accepted: 10/05/2020] [Indexed: 02/05/2023]
Abstract
The conjoining of salient pharmacophoric properties directing the development of prominent cytotoxic agents was executed by constructing thiadiazolo-carboxamide bridged β-carboline-indole hybrids. On the evaluation of in vitro cytotoxic potential, 12c exhibited prodigious cytotoxicity among the synthesized new molecules 12a-k, with an IC50 < 5 μM in all the tested cancer cell lines (A549, MDA-MB-231, BT-474, HCT-116, THP-1) and the best cytotoxic potential was expressed in lung cancer cell line (A549) with an IC50 value of 2.82 ± 0.10 μM. Besides, another compound 12a also displayed impressive cytotoxicity against A549 cell line (IC50: 3.00 ± 1.40 μM). Further target-based assay of these two compounds 12c and 12a revealed their potential as DNA intercalative topoisomerase-IIα inhibitors. Additionally, the antiproliferative activity of compound 12c was measured in A549 cells by traditional apoptosis assays revealing the nuclear, morphological alterations, and depolarization of membrane potential in mitochondria and externalization of phosphatidylserine in a concentration-dependent manner. Cell cycle analysis unveiled the G0/G1 phase inhibition and wound healing assay inferred the inhibition of in vitro cell migration by compound 12c in lung cancer cells. Remarkably, the safety profile of compound 12c was disclosed by screening against normal human lung epithelial cell line (BEAS-2B: IC50: 71.2 ± 7.95 μM) with a selectivity index range of 14.9-25.26. Moreover, Molecular modeling studies affirm the intercalative binding of compound 12c and 12a in the active pocket of topo-IIα. Furthermore, in silico prediction of physico-chemical parameters divulged the propitious drug-like properties of the synthesized derivatives.
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Affiliation(s)
- Ramya Tokala
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500 037, India
| | - Sravani Sana
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500 037, India
| | - Uppu Jaya Lakshmi
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500 037, India
| | - Prasanthi Sankarana
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500 037, India
| | - Dilep Kumar Sigalapalli
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500 037, India
| | - Nikhil Gadewal
- Bioinformatics Centre, Advanced Centre for Treatment, Research & Education in Cancer, Tata Memorial Centre, Kharghar, Navi Mumbai 410210, India
| | - Jyoti Kode
- Tumor Immunology & Immunotherapy Group, Advanced Centre for Treatment, Research & Education in Cancer, Tata Memorial Centre, Kharghar, Navi Mumbai 410210, India; Homi-Bhabha National Institute (HBNI), Training School Complex, Anushakti Nagar, Mumbai 400094, India
| | - Nagula Shankaraiah
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500 037, India.
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Rocchi D, Gómez-Carpintero J, González JF, Menéndez JC. Sustainable Access to Acridin-9-(10 H)ones with an Embedded m-Terphenyl Moiety Based on a Three-Component Reaction. Molecules 2020; 25:molecules25235565. [PMID: 33260917 PMCID: PMC7731126 DOI: 10.3390/molecules25235565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/23/2020] [Accepted: 11/25/2020] [Indexed: 11/16/2022] Open
Abstract
A Ce(IV)-catalyzed three-component reaction between chalcones, anilines and β-ketoesters followed by a microwave-assisted thermal cyclization afforded 1,3-diaryl-1,2-dihydroacridin-9(10H)-ones. Their microwave irradiation in nitrobenzene, acting both as solvent and oxidant, afforded fully unsaturated 1,3-diarylacridin-9(10H)-ones, which combine acridin-9-(10H)one and m-terphenyl moieties. Overall, the route generates three C-C and one C-N bond and has the advantage of requiring a single chromatographic separation.
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Vernardou D, Drosos C, Kafizas A, Pemble ME, Koudoumas E. Towards High Performance Chemical Vapour Deposition V 2O 5 Cathodes for Batteries Employing Aqueous Media. Molecules 2020; 25:molecules25235558. [PMID: 33256209 PMCID: PMC7730033 DOI: 10.3390/molecules25235558] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 11/22/2020] [Accepted: 11/25/2020] [Indexed: 11/16/2022] Open
Abstract
The need for clean and efficient energy storage has become the center of attention due to the eminent global energy crisis and growing ecological concerns. A key component in this effort is the ultra-high performance battery, which will play a major role in the energy industry. To meet the demands in portable electronic devices, electric vehicles, and large-scale energy storage systems, it is necessary to prepare advanced batteries with high safety, fast charge ratios, and discharge capabilities at a low cost. Cathode materials play a significant role in determining the performance of batteries. Among the possible electrode materials is vanadium pentoxide, which will be discussed in this review, due to its low cost and high theoretical capacity. Additionally, aqueous electrolytes, which are environmentally safe, provide an alternative approach compared to organic media for safe, cost-effective, and scalable energy storage. In this review, we will reveal the industrial potential of competitive methods to grow cathodes with excellent stability and enhanced electrochemical performance in aqueous media and lay the foundation for the large-scale production of electrode materials.
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Affiliation(s)
- Dimitra Vernardou
- Department of Electrical and Computer Engineering, School of Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece;
- Institute of Emerging Technologies, Hellenic Mediterranean University Center, 71410 Heraklion, Greece
- Correspondence: ; Tel.: +30-2810-379631
| | | | - Andreas Kafizas
- Department of Chemistry, Molecular Science Research Hub, Imperial College London, White City, London W12 0BZ, UK;
- Grantham Institute for Climate Change and the Environment, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Martyn E. Pemble
- School of Chemistry, University College Cork, T12 YN60 Cork, Ireland;
| | - Emmanouel Koudoumas
- Department of Electrical and Computer Engineering, School of Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece;
- Institute of Emerging Technologies, Hellenic Mediterranean University Center, 71410 Heraklion, Greece
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Abstract
In the past months, the use of the drug hydroxychloroquine has considerably increased in many countries, associated with a proposed treatment for the COVID-19 disease. Although there is no conclusive evidence about the efficacy of the drug for this purpose, surprisingly there are no conclusive studies in the literature concerning its mechanism of action inside cells, which is related to its interaction with nucleic acids. Here, we performed a robust characterization of the interaction between hydroxychloroquine and double-stranded DNA using single-molecule force spectroscopy and gel electrophoresis. Two different binding modes were identified, namely, minor groove binding for low drug concentrations and intercalation for high drug concentrations, and the sets of binding parameters were determined for each of these modes. Such results have unraveled in detail the molecular mechanism of action of the drug as a DNA ligand.
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Affiliation(s)
- R F Bazoni
- Departamento de Ciências Naturais, Universidade Federal do Espírito Santo, São Mateus, Espírito Santo 29.932-540, Brazil
| | - T A Moura
- Departamento de Física, Universidade Federal de Viçosa. Viçosa, Minas Gerais 36.570-900, Brazil
| | - M S Rocha
- Departamento de Física, Universidade Federal de Viçosa. Viçosa, Minas Gerais 36.570-900, Brazil
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Baulin E, Metelev V, Bogdanov A. Base-intercalated and base-wedged stacking elements in 3D-structure of RNA and RNA-protein complexes. Nucleic Acids Res 2020; 48:8675-8685. [PMID: 32687167 PMCID: PMC7470943 DOI: 10.1093/nar/gkaa610] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 07/05/2020] [Accepted: 07/15/2020] [Indexed: 12/25/2022] Open
Abstract
Along with nucleobase pairing, base-base stacking interactions are one of the two main types of strong non-covalent interactions that define the unique secondary and tertiary structure of RNA. In this paper we studied two subfamilies of nucleobase-inserted stacking structures: (i) with any base intercalated between neighboring nucleotide residues (base-intercalated element, BIE, i + 1); (ii) with any base wedged into a hydrophobic cavity formed by heterocyclic bases of two nucleotides which are one nucleotide apart in sequence (base-wedged element, BWE, i + 2). We have exploited the growing database of natively folded RNA structures in Protein Data Bank to analyze the distribution and structural role of these motifs in RNA. We found that these structural elements initially found in yeast tRNAPhe are quite widespread among the tertiary structures of various RNAs. These motifs perform diverse roles in RNA 3D structure formation and its maintenance. They contribute to the folding of RNA bulges and loops and participate in long-range interactions of single-stranded stretches within RNA macromolecules. Furthermore, both base-intercalated and base-wedged motifs participate directly or indirectly in the formation of RNA functional centers, which interact with various ligands, antibiotics and proteins.
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Affiliation(s)
- Eugene Baulin
- Laboratory of Applied Mathematics, Institute of Mathematical Problems of Biology RAS - the Branch of Keldysh Institute of Applied Mathematics of Russian Academy of Sciences, Pushchino, Moscow Region 142290, Russia
| | - Valeriy Metelev
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Alexey Bogdanov
- To whom correspondence should be addressed. Tel: +7 495 9393143; Fax: +7 495 9393181;
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35
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Tsubono Y, Kawamoto Y, Hidaka T, Pandian GN, Hashiya K, Bando T, Sugiyama H. A Near-Infrared Fluorogenic Pyrrole-Imidazole Polyamide Probe for Live-Cell Imaging of Telomeres. J Am Chem Soc 2020; 142:17356-17363. [PMID: 32955878 PMCID: PMC7683039 DOI: 10.1021/jacs.0c04955] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Telomeres are closely associated with cellular senescence and cancer. Although some techniques have been developed to label telomeres in living cells for study of telomere dynamics, few biocompatible near-infrared probes based on synthetic molecules have been reported. In this study, we developed a near-infrared fluorogenic pyrrole-imidazole polyamide probe (SiR-TTet59B) to visualize telomeres by conjugating a silicon-rhodamine (SiR) fluorophore with a tandem tetramer pyrrole-imidazole polyamide targeting 24 bp in the telomeric double-stranded (ds) DNA. SiR-TTet59B was almost nonfluorescent in water but increased its fluorescence dramatically on binding to telomeric dsDNA. Using a peptide-based delivery reagent, we demonstrated the specific and effective visualization of telomeres in living U2OS cells. Moreover, SiR-TTet59B could be used to observe the dynamic movements of telomeres during interphase and mitosis. This simple imaging method using a synthetic near-infrared probe could be a powerful tool for studies of telomeres and for diagnosis.
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Affiliation(s)
- Yutaro Tsubono
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Yusuke Kawamoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Takuya Hidaka
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Ganesh N. Pandian
- Institute for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University, Sakyo, Kyoto 6060-8501, Japan
| | - Kaori Hashiya
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Toshikazu Bando
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Hiroshi Sugiyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
- Institute for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University, Sakyo, Kyoto 6060-8501, Japan
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Kaczorowska A, Lamperska W, Frączkowska K, Masajada J, Drobczyński S, Sobas M, Wróbel T, Chybicka K, Tarkowski R, Kraszewski S, Podbielska H, Kałas W, Kopaczyńska M. Profound Nanoscale Structural and Biomechanical Changes in DNA Helix upon Treatment with Anthracycline Drugs. Int J Mol Sci 2020; 21:ijms21114142. [PMID: 32531996 PMCID: PMC7312087 DOI: 10.3390/ijms21114142] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 05/16/2020] [Accepted: 06/04/2020] [Indexed: 11/16/2022] Open
Abstract
In our study, we describe the outcomes of the intercalation of different anthracycline antibiotics in double-stranded DNA at the nanoscale and single molecule level. Atomic force microscopy analysis revealed that intercalation results in significant elongation and thinning of dsDNA molecules. Additionally, using optical tweezers, we have shown that intercalation decreases the stiffness of DNA molecules, that results in greater susceptibility of dsDNA to break. Using DNA molecules with different GC/AT ratios, we checked whether anthracycline antibiotics show preference for GC-rich or AT-rich DNA fragments. We found that elongation, decrease in height and decrease in stiffness of dsDNA molecules was highest in GC-rich dsDNA, suggesting the preference of anthracycline antibiotics for GC pairs and GC-rich regions of DNA. This is important because such regions of genomes are enriched in DNA regulatory elements. By using three different anthracycline antibiotics, namely doxorubicin (DOX), epirubicin (EPI) and daunorubicin (DAU), we could compare their detrimental effects on DNA. Despite their analogical structure, anthracyclines differ in their effects on DNA molecules and GC-rich region preference. DOX had the strongest overall effect on the DNA topology, causing the largest elongation and decrease in height. On the other hand, EPI has the lowest preference for GC-rich dsDNA. Moreover, we demonstrated that the nanoscale perturbations in dsDNA topology are reflected by changes in the microscale properties of the cell, as even short exposition to doxorubicin resulted in an increase in nuclei stiffness, which can be due to aberration of the chromatin organization, upon intercalation of doxorubicin molecules.
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Affiliation(s)
- Aleksandra Kaczorowska
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 27 Wybrzeze Wyspianskiego, 50-370 Wroclaw, Poland; (A.K.); (K.F.); (S.K.); (H.P.)
| | - Weronika Lamperska
- Department of Optics and Photonics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 27 Wybrzeze Wyspianskiego, 50-370 Wroclaw, Poland; (W.L.); (J.M.); (S.D.)
| | - Kaja Frączkowska
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 27 Wybrzeze Wyspianskiego, 50-370 Wroclaw, Poland; (A.K.); (K.F.); (S.K.); (H.P.)
| | - Jan Masajada
- Department of Optics and Photonics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 27 Wybrzeze Wyspianskiego, 50-370 Wroclaw, Poland; (W.L.); (J.M.); (S.D.)
| | - Sławomir Drobczyński
- Department of Optics and Photonics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 27 Wybrzeze Wyspianskiego, 50-370 Wroclaw, Poland; (W.L.); (J.M.); (S.D.)
| | - Marta Sobas
- Department of Hematology, Blood Neoplasms and Bone Marrow Transplantation, Wroclaw Medical University, Pasteura 4, 50-367 Wroclaw, Poland; (M.S.); (T.W.)
| | - Tomasz Wróbel
- Department of Hematology, Blood Neoplasms and Bone Marrow Transplantation, Wroclaw Medical University, Pasteura 4, 50-367 Wroclaw, Poland; (M.S.); (T.W.)
| | - Kinga Chybicka
- Department of Experimental Oncology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Rudolfa Weigla 12, 53-114 Wroclaw, Poland; (K.C.); (W.K.)
| | - Radosław Tarkowski
- Department of Surgical Oncology, Provincial Specialist Hospital, Iwaszkiewicza 5, 59-220 Legnica, Poland;
| | - Sebastian Kraszewski
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 27 Wybrzeze Wyspianskiego, 50-370 Wroclaw, Poland; (A.K.); (K.F.); (S.K.); (H.P.)
| | - Halina Podbielska
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 27 Wybrzeze Wyspianskiego, 50-370 Wroclaw, Poland; (A.K.); (K.F.); (S.K.); (H.P.)
| | - Wojciech Kałas
- Department of Experimental Oncology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Rudolfa Weigla 12, 53-114 Wroclaw, Poland; (K.C.); (W.K.)
| | - Marta Kopaczyńska
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 27 Wybrzeze Wyspianskiego, 50-370 Wroclaw, Poland; (A.K.); (K.F.); (S.K.); (H.P.)
- Correspondence: ; Tel.: +48-71-320-46-17
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37
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Alnajrani MN, Alsager OA. Decomposition of DNA staining agent ethidium bromide by gamma irradiation: Conditions, kinetics, by-products, biological activity, and removal from wastewater. J Hazard Mater 2020; 389:122142. [PMID: 32004843 DOI: 10.1016/j.jhazmat.2020.122142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/14/2020] [Accepted: 01/18/2020] [Indexed: 06/10/2023]
Abstract
Ethidium Bromide (Eth-Br) is an intercalating agent commonly used in medical and biological laboratories as a DNA staining dye. Despite its popular use, aqueous solutions containing Eth-Br showed high toxicity, mutagenic capacity, and deactivate DNA transcription. In this study, the removal of Eth-Br from aqueous solutions by gamma irradiation has been fully investigated. Gamma irradiation was capable of achieving a near complete removal of Eth-Br in neutral and non-buffered aqueous solutions at an absorbed dose of 15 kGy. Various experimental conditions were studied and showed that the removal efficiency is not diminished. The addition of hydrogen peroxide (2 %) to the irradiated solutions reduced the D50 and D90 by 50 %. Modeling Eth-Br decomposition showed that the reaction followed pseudo first-order kinetics and reaches at least 90 % removal under all experimental conditions. TOC and HPLC measurements confirmed that Eth-Br is fully mineralized when the absorbed dose reaches 15 kGy. The biological activity of Eth-Br after irradiation treatment was investigated with synthetic DNA and natural DNA. The biological activity of Eth-Br was deactivated at an absorbed dose as low as 5 kGy. Toxicity measurement with E-coli bacteria also confirmed that the absorbed dose of 5 kGy was sufficient to remove Eth-Br toxicity.
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Affiliation(s)
- Mohammed N Alnajrani
- National Center for Irradiation Technology, Nuclear Science Research Institute, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh, 11442, Saudi Arabia
| | - Omar A Alsager
- National Center for Irradiation Technology, Nuclear Science Research Institute, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh, 11442, Saudi Arabia.
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38
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Pramanik S, Nandy A, Chakraborty S, Pramanik U, Nandi S, Mukherjee S. Preferential Binding of Thioflavin T to AT-Rich DNA: White Light Emission through Intramolecular Förster Resonance Energy Transfer. J Phys Chem Lett 2020; 11:2436-2442. [PMID: 32141760 DOI: 10.1021/acs.jpclett.0c00237] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Herein we report the effect of different nucleobase pair compositions on the association-induced fluorescence enhancement property of Thioflavin T (ThT), upon binding with 20 base pair long double-stranded DNA (dsDNA). Analysis of binding and decay constants along with the association (Kass) and dissociation (Kdiss) rate constants obtained from the fluctuation in the fluorescence intensity of ThT after binding with different DNA revealed selective affinity of ThT toward AT-rich dsDNA. Molecular docking also substantiates the experimental results. We also observed that addition of orange-emitting ethidium bromide (EtBr) to cyan-emitting ThT-DNA complexes leads to bright white light emission (WLE) through Förster resonance energy transfer. Additionally, the emission of white light is far greater in the case of intra-DNA strands. Besides endorsing the binding insights of ThT to AT-rich dsDNA, the present investigations open a new perspective for realizing promising WLE from two biomarkers without labeling the DNA.
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Affiliation(s)
- Srikrishna Pramanik
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Atanu Nandy
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Subhajit Chakraborty
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Ushasi Pramanik
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Somen Nandi
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Saptarshi Mukherjee
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
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Abstract
DNA-templated self-assembly represents a rich and growing subset of supramolecular chemistry where functional self-assemblies are programmed in a versatile manner using nucleic acids as readily-available and readily-tunable templates. In this review, we summarize the different DNA recognition modes and the basic supramolecular interactions at play in this context. We discuss the recent results that report the DNA-templated self-assembly of small molecules into complex yet precise nanoarrays, going from 1D to 3D architectures. Finally, we show their emerging functions as photonic/electronic nanowires, sensors, gene delivery vectors, and supramolecular catalysts, and their growing applications in a wide range of area from materials to biological sciences.
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Affiliation(s)
- Mathieu Surin
- Laboratory for Chemistry of Novel MaterialsCenter of Innovation and Research in Materials and Polymers (CIRMAP)University of Mons-UMONS7000MonsBelgium
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40
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Miller HL, Contera S, Wollman AJM, Hirst A, Dunn KE, Schröter S, O'Connell D, Leake MC. Biophysical characterisation of DNA origami nanostructures reveals inaccessibility to intercalation binding sites. Nanotechnology 2020; 31:235605. [PMID: 32125281 DOI: 10.1088/1361-6528/ab7a2b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Intercalation of drug molecules into synthetic DNA nanostructures formed through self-assembled origami has been postulated as a valuable future method for targeted drug delivery. This is due to the excellent biocompatibility of synthetic DNA nanostructures, and high potential for flexible programmability including facile drug release into or near to target cells. Such favourable properties may enable high initial loading and efficient release for a predictable number of drug molecules per nanostructure carrier, important for efficient delivery of safe and effective drug doses to minimise non-specific release away from target cells. However, basic questions remain as to how intercalation-mediated loading depends on the DNA carrier structure. Here we use the interaction of dyes YOYO-1 and acridine orange with a tightly-packed 2D DNA origami tile as a simple model system to investigate intercalation-mediated loading. We employed multiple biophysical techniques including single-molecule fluorescence microscopy, atomic force microscopy, gel electrophoresis and controllable damage using low temperature plasma on synthetic DNA origami samples. Our results indicate that not all potential DNA binding sites are accessible for dye intercalation, which has implications for future DNA nanostructures designed for targeted drug delivery.
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Affiliation(s)
- Helen L Miller
- Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom
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41
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Abstract
Platinum(II) polypyridine complexes of a square-planar geometry have been used as spectroscopic reporters for quantification of various charged species through non-covalent metal-metal interactions. The characterization of molecular weights and architectures of polyelectrolytes represents a challenging task in polymer science. Here, we report the utilization of platinum(II) complex probes and non-covalent metal-metal interactions for sensing polyelectrolyte lengths and architectures. It is found that the platinum(II) probes can bind to linear polyelectrolytes via electrostatic attractions and give rise to significant spectroscopic changes associated with the formation of metal-metal interactions, and the extent of the spectroscopic changes is found to increase with the lengths of the linear polyelectrolytes. Besides, the platinum(II) probes have been found to co-assemble with the linear polyelectrolytes to form well-defined nanofibers, and the lengths of the linear polyelectrolytes can be directly estimated from the diameter of the nanofibers under transmission electron microscopy observation. Interestingly, upon mixing with the platinum(II) probes, polyelectrolytes with bottlebrush architectures have been found to exhibit larger spectroscopic changes than linear polyelectrolytes with the same chemical composition. Combined with the reported theoretical studies on counterion condensation of polyelectrolytes, the platinum(II) complexes are found to function as spectroscopic probes for sensing the charge densities of the polyelectrolytes with different lengths and diverse architectures. Moreover, platinum(II) probes pre-organized in nanostructured aggregates have been found to intercalate into double-stranded DNA, which are naturally occurring biological polyelectrolytes with helical architectures and intercalation sites, to give significant enhancement of spectroscopic changes when compared to the intercalation of monomeric platinum(II) probes into double-stranded DNA.
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Affiliation(s)
- Kaka Zhang
- Institute of Molecular Functional Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
| | - Margaret Ching-Lam Yeung
- Institute of Molecular Functional Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
| | - Sammual Yu-Lut Leung
- Institute of Molecular Functional Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , PR China
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42
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Jiang GB, Zhang WY, He M, Gu YY, Bai L, Wang YJ, Yi QY, Du F. New ruthenium polypyridyl complexes functionalized with fluorine atom or furan: Synthesis, DNA-binding, cytotoxicity and antitumor mechanism studies. Spectrochim Acta A Mol Biomol Spectrosc 2020; 227:117534. [PMID: 31685424 DOI: 10.1016/j.saa.2019.117534] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 08/27/2019] [Accepted: 09/13/2019] [Indexed: 06/10/2023]
Abstract
Two novel ruthenium(II) polypyridyl complexes, namely, [Ru(dmp)2(CAPIP)](ClO4)2 (Ru(II)-1) and [Ru(dmp)2(CFPIP)](ClO4)2 (Ru(II)-2), which respectively contain (E)-2-(2-(furan-2-yl)vinyl)-1H-imidazo[4,5-f][1,10]phen-anthroline (CAPIP) and (E)-2-(4-fluorostyryl)-1H-imidazo[4,5-f][1,10]phenanthroline. (CFPIP), were first designed and characterized (dmp = 2,9-dimethyl-1,10-phenanthroline). DNA binding experiments indicated that Ru(II) complexes interact with CT DNA through intercalative mode. In addition, the complexes Ru(II)-1 and Ru(II)-2, showed remarkable cell cytotoxicity, giving the respective IC50 values of 4.1 ± 1.4 μM and 6.1 ± 1.4 μM on the A549 cancer cells. These values indicated higher activity than CAPIP, CFPIP, cisplatin (8.2 ± 1.4 μM) and other corresponding Ru(II) polypyridyl complexes. Furthermore, the Ru(II) complexes could arrive the cytoplasm through the cell membrane and accumulate in the mitochondria. Significantly, complexes Ru(II)-1 and Ru(II)-2 induced A549 cells apoptosis was mediated by increase of ROS levels and dysfunction of mitochondria, and resulted in cell cycle arrest and increased anti-migration activity on A549 cells. Overall, these results indicated that complexes Ru(II)-1 and Ru(II)-2 could be suitable candidates for further investigation as a chemotherapeutic agent in the treatment of tumors.
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Affiliation(s)
- Guang-Bin Jiang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, China.
| | - Wen-Yao Zhang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China
| | - Miao He
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China
| | - Yi-Ying Gu
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China
| | - Lan Bai
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China
| | - Yang-Jie Wang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China
| | - Qiao-Yan Yi
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China
| | - Fan Du
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China
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Gan C, Huang X, Zhan J, Liu X, Huang Y, Cui J. Study on the interactions between B-norcholesteryl benzimidazole compounds with ct-DNA. Spectrochim Acta A Mol Biomol Spectrosc 2020; 227:117525. [PMID: 31703992 DOI: 10.1016/j.saa.2019.117525] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 07/30/2019] [Accepted: 09/09/2019] [Indexed: 06/10/2023]
Abstract
The study of molecule-DNA interaction is very important for designing an improved therapeutic agent. In previous studies, we synthesized some B-norcholesteryl benzimidazole compounds, and the tests on cancer cells showed that these compounds had good in vitro anti-cancer activities. In order to further investigate mechanism of their actions, three different B-norcholesteryl benzimidazole compounds were selected and interaction of these compounds with the calf thymus DNA (ct-DNA) was monitored by using various methods including UV-Vis and fluorescence spectroscopic techniques, viscosity measurement, and circular dichroism (CD). The results proved a hypochromic effect accompanied with a slight red-shift due to the interaction of the molecules with ct-DNA. According to the UV-Vis and fluorescence spectra, the mentioned compounds were bound to DNA, preferentially through partial intercalation into the DNA helix. Moreover, the ethidium bromide (EB) and Hoechst 33258 competitive binding experiments were also used to confirm the interaction mode of the compounds with ct-DNA. In the Hoechst 33258 displacement experiment, no significant change in the fluorescence intensity was observed. Additional assays such as iodide quenching, viscosity, and CD spectroscopy further confirmed that intercalation should be the major binding mode of the selected compounds with DNA. The cytotoxicity of these three compounds was also evaluated by MTT method, and the results confirmed that binding ability of these compounds to DNA was consistent with their cytotoxicity behavior. The experimental results indicated a higher binding affinity for compound 3 compared to the other compounds. This research provided a better understanding on the molecular mechanism of the interaction between B-norcholesteryl benzimidazole compounds and tumor cells, and offered a beneficial perspective to the designation of novel B-norsteroidal anticancer compounds.
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Affiliation(s)
- Chunfang Gan
- Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Key Laboratory of Beibu Gulf Environment Change and Resources Utilization, School of Chemistry and Material, Nanning Normal University, Nanning, 530001, PR China.
| | - Xiaotong Huang
- Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Key Laboratory of Beibu Gulf Environment Change and Resources Utilization, School of Chemistry and Material, Nanning Normal University, Nanning, 530001, PR China
| | - Junyan Zhan
- Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Key Laboratory of Beibu Gulf Environment Change and Resources Utilization, School of Chemistry and Material, Nanning Normal University, Nanning, 530001, PR China
| | - Xiaolan Liu
- Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Key Laboratory of Beibu Gulf Environment Change and Resources Utilization, School of Chemistry and Material, Nanning Normal University, Nanning, 530001, PR China
| | - Yanmin Huang
- Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Key Laboratory of Beibu Gulf Environment Change and Resources Utilization, School of Chemistry and Material, Nanning Normal University, Nanning, 530001, PR China
| | - Jianguo Cui
- Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Key Laboratory of Beibu Gulf Environment Change and Resources Utilization, School of Chemistry and Material, Nanning Normal University, Nanning, 530001, PR China; Guangxi Colleges and University Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization, Beibuwan University, Qinzhou, 535099, PR China.
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Asadi Z, Zarei L, Golchin M, Skorepova E, Eigner V, Amirghofran Z. A novel Cu(II) distorted cubane complex containing Cu 4O 4 core as the first tetranuclear catalyst for temperature dependent oxidation of 3,5-di-tert-butyl catechol and in interaction with DNA & protein (BSA). Spectrochim Acta A Mol Biomol Spectrosc 2020; 227:117593. [PMID: 31654847 DOI: 10.1016/j.saa.2019.117593] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 10/01/2019] [Accepted: 10/01/2019] [Indexed: 06/10/2023]
Abstract
The tri-dentate Schiff base ligand 3-(2-hydroxyethylimino)-1-phenylbut-1-en-1-ol (L) produced the tetra-nuclear Cu(II) distorted cubane complex which contain Cu4O4 core, upon reaction with Cu(II)acetate.H2O. The complex was structurally characterized by X-ray crystallography and found that, in this tetrameric and tetra-nuclear distorted cubane structure, each two-fold deprotonated Schiff base ligand coordinated to a Cu(II) center with their alcoholic oxygens and imine nitrogens and formed six and five-membered chelate rings. At the same time, each ligand bridged to a neighboring Cu(II) atom by its alcoholic oxygen, thus the metal centers became penta-coordinated. The copper(II) complex with μ-ɳ2-hydroxo bridges and Cu….Cu distance about 3 Å was structurally similar to the active site of natural catechol oxidase enzyme and exhibited excellent catecholase activity in aerobic oxidation of 3,5-di-tert-butyl catechol to its o-quinone. The kinetics and mechanism of the oxidation of 3, 5-DTBCH2 catalyzed by [CuL]4 complex, were studied at four different temperatures from 283 to 313K by UV-Vis spectroscopy. Interaction of [CuL]4 complex with FS-DNA was investigated by UV-Vis and fluorescence spectroscopy, viscosity measurements, cyclic voltammetry (CV), circular dichroism (CD) and agarose gel electrophoresis. The main mode of binding of the complexes with DNA was intercalation. The interaction between [CuL]4 complex and bovine serum albumin (BSA) was studied by UV-Vis, fluorescence and synchronous fluorescence spectroscopic techniques. The results indicated a high binding affinity of the complex to BSA. In vitro anticancer activity of the complex was evaluated against A549, Jurkat and Ragi cell lines by MTT assay. The complex was remarkably active against the cell lines and can be a good candidate for an anticancer drug. Theoretical docking studies were performed to further investigate the DNA and BSA binding interactions.
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Affiliation(s)
- Zahra Asadi
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz, 71454, Iran.
| | - Leila Zarei
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz, 71454, Iran
| | - Maryam Golchin
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz, 71454, Iran
| | - Eliska Skorepova
- Institute of Physics ASCR, v.v.i, Na Slovance 2, 182 21, Prague, Czech Republic
| | - Vaclav Eigner
- Institute of Physics ASCR, v.v.i, Na Slovance 2, 182 21, Prague, Czech Republic
| | - Zahra Amirghofran
- Department of Immunology and Autoimmune Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, 71454, Iran
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Abstract
Here, we developed a coralyne-based, 'light-up' intercalator displacement assay to identify molecular stabilizers of triplex DNA using a sequence from a chromosomal breakpoint hotspot in the human c-MYC oncogene. Its potential to identify triplex DNA ligands was demonstrated using BePI and doxorubicin. Identification of triplex-interacting ligands may allow the regulation of genetic instability in human genomes.
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Affiliation(s)
- Imee M A Del Mundo
- Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Dell Pediatric Research Institute, 1400 Barbara Jordan Blvd., Austin, TX, USA.
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Pyne P, Samanta N, Patra A, Das A, Sen P, Mitra RK. Polyethylene glycols affect electron transfer rate in phenosafranin-DNA complex. Spectrochim Acta A Mol Biomol Spectrosc 2020; 225:117464. [PMID: 31465973 DOI: 10.1016/j.saa.2019.117464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 08/06/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
Long distance electron transfer (ET) between small ligands and DNA is a much studied phenomenon and is principally believed to occur through electron (or hole) hopping. Several studies have been carried out in aqueous environments while in real biological milieu the DNA molecules experience a more dense and heterogeneous environment containing otherwise indifferent molecular crowders. It is therefore expected that the ET could get modified in the presence of crowding agent and to investigate that we have made elaborate studies on steady state and time-resolved (picosecond (ps) and femtosecond (fs)-resolved) emission properties of a phenosafranine (PSF) intercalated to calf thymus (CT) DNA in the presence of ethylene glycol (EG) and polyethylene glycols (PEG) of different chain lengths (PEG 200, 400 and 1000). The emission of PSF gets considerably quenched when intercalated to DNA; the quenching is released when PEGs are added into it. The structural integrity of the CT DNA has been established using circular dichroism spectroscopy. CD measurements have evidenced only marginal changes in the DNA structure upon the addition of PEGs. ps-Resolved fluorescence measurements show significant decrease in the contribution of the DNA induced quenched time-constant of PSF upon the addition of PEGs, however, fs-resolved measurements show less noticeable changes in the time constants. Our study shows that the electron hopping rate through the guanine base in DNA core remains unaffected whereas the 'through space' electron transfer process does get affected in the presence of molecular crowders.
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Affiliation(s)
- Partha Pyne
- Department of Chemical, Biological and Macromolecular Sciences, S N Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 106, India
| | - Nirnay Samanta
- Department of Chemical, Biological and Macromolecular Sciences, S N Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 106, India
| | - Animesh Patra
- Department of Chemical, Biological and Macromolecular Sciences, S N Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 106, India
| | - Aritra Das
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Pratik Sen
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India.
| | - Rajib Kumar Mitra
- Department of Chemical, Biological and Macromolecular Sciences, S N Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 106, India.
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Lo PY, Lee GY, Zheng JH, Huang JH, Cho EC, Lee KC. Intercalating pyrene with polypeptide as a novel self-assembly nano-carrier for colon cancer suppression in vitro and in vivo. Mater Sci Eng C Mater Biol Appl 2019; 109:110593. [PMID: 32228904 DOI: 10.1016/j.msec.2019.110593] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 12/20/2019] [Accepted: 12/21/2019] [Indexed: 11/18/2022]
Abstract
Giving patients right dosage is an essential concept of precision medicine. Most of nanocarriers lack of flexible drug capacity and structural stability to be customized for specific treatment, resulting in low therapeutic efficacy and unexpected side effects. Thus, a growing need emerges for fast and rigorous approaches to develop nanoparticles with properties of adjustable dosage and controllable particle size. Poly-l-Lysine is known for its enhanced bioadhesivity and pH-triggered structural swelling effect, which is utilized as the main agent to activate the multistage drug releasing. Inspired by natural bio-assembly system, we report a simple method to self-assemble Poly-l-Lysine-based nanoparticles via supramolecular recognitions of cross-linked pyrenes, which provides noncovalent force to flexibly encapsulate Doxorubincin and to construct robust nanostructures. Pyrene-modified polypeptide self-assemblies are able to adjust drug payload from 1: 10 to 2:1 (drug: polypeptide) without changing its uniform nano-spherical morphology. This nanostructure remained the as-made morphology even after experiencing the long-term (~ 10 weeks) storage at room temperature. Also, the nanoparticles displayed multi-step drug release behaviours and exhibited great in vitro and in vivo cytotoxicity towards colon cancer cells. The as-mentioned nanoparticles provide a novel perspective to compensate the clinical needs of specific drug feedings and scalable synthesis with advantages of simple-synthesis, size-adaptivity, and morphology reversibility.
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Affiliation(s)
- Pei-Ying Lo
- Department of Science Education, National Taipei University of Education, No.134, Sec. 2, Heping E. Rd., Da-an District, Taipei City 106, Taiwan
| | - Guang-Yu Lee
- Department of Science Education, National Taipei University of Education, No.134, Sec. 2, Heping E. Rd., Da-an District, Taipei City 106, Taiwan
| | - Jia-Huei Zheng
- School of Pharmacy, College of Pharmacy, Taipei Medical University, 250 Wuxing Street, Taipei City 110, Taiwan
| | - Jen-Hsien Huang
- Department of Green Material Technology, Green Technology Research Institute, CPC Corporation, Kaohsiung 81126, Taiwan
| | - Er-Chieh Cho
- School of Pharmacy, College of Pharmacy, Taipei Medical University, 250 Wuxing Street, Taipei City 110, Taiwan; Master Program in Clinical Pharmacogenomics and Pharmacoproteomics, College of Pharmacy, Taipei Medical University, 250 Wuxing Street, Taipei City 110, Taiwan; Cancer Center, Wan Fang Hospital, Taipei Medical University, Taiwan.
| | - Kuen-Chan Lee
- Department of Science Education, National Taipei University of Education, No.134, Sec. 2, Heping E. Rd., Da-an District, Taipei City 106, Taiwan; PhD Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei City, 110, Taiwan.
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Li J, Liu R, Jiang J, Liang X, Huang L, Huang G, Chen H, Pan L, Ma Z. Zinc(II) Terpyridine Complexes: Substituent Effect on Photoluminescence, Antiproliferative Activity, and DNA Interaction. Molecules 2019; 24:molecules24244519. [PMID: 31835555 PMCID: PMC6943603 DOI: 10.3390/molecules24244519] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 12/02/2019] [Accepted: 12/06/2019] [Indexed: 02/07/2023] Open
Abstract
A series of ZnCl2 complexes (compounds 1–10) with 4′-(substituted-phenyl)-2,2′:6′,2′′-terpyridine that bears hydrogen (L1), p-methyl (L2), p-methoxy (L3), p-phenyl (L4), p-tolyl (L5), p-hydroxyl (L6), m-hydroxyl (L7), o-hydroxyl (L8), p-carboxyl (L9), or p-methylsulfonyl (L10) were prepared and then characterized by 1H NMR, electrospray mass-spectra (ESI-MS), IR, elemental analysis, and single crystal X-ray diffraction. In vitro cytotoxicity assay was used to monitor the antiproliferative activities against tumor cells. Absorption spectroscopy, fluorescence titration, circular dichroism spectroscopy, and molecular modeling studied the DNA interactions. All of the compounds display interesting photoluminescent properties and different maximal emission peaks due to the difference of the substituent groups. The cell viability studies indicate that the compounds have excellent antiproliferative activity against four human carcinoma cell lines, A549, Bel-7402, MCF-7, and Eca-109, with the lowest IC50 values of 0.33 (10), 0.66 (6), 0.37 (7), and 1.05 (7) μM, respectively. The spectrophotometric results reveal that the compounds have strong affinity binding with DNA as intercalator and induce DNA conformational transition. Molecular docking studies indicate that the binding is contributed by the π…π stacking and hydrogen bonds, providing an order of nucleotide sequence binding selectivity as ATGC > ATAT > GCGC. These compounds intercalate into the base pairs of the DNA of the tumor cells to affect their replication and transcription, and the process is supposed to play an important role in the anticancer mechanism.
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Affiliation(s)
- Jiahe Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (J.L.); (R.L.); (J.J.); (X.L.); (L.H.)
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
| | - Rongping Liu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (J.L.); (R.L.); (J.J.); (X.L.); (L.H.)
| | - Jinzhang Jiang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (J.L.); (R.L.); (J.J.); (X.L.); (L.H.)
| | - Xing Liang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (J.L.); (R.L.); (J.J.); (X.L.); (L.H.)
| | - Ling Huang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (J.L.); (R.L.); (J.J.); (X.L.); (L.H.)
| | - Gang Huang
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530004, Guangxi, China;
| | - Hailan Chen
- School of Animal Science and Technology, Guangxi University, Nanning 530004, Guangxi, China
- Correspondence: (H.C.); (L.P.); (Z.M.)
| | - Lixia Pan
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530004, Guangxi, China;
- Correspondence: (H.C.); (L.P.); (Z.M.)
| | - Zhen Ma
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China; (J.L.); (R.L.); (J.J.); (X.L.); (L.H.)
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
- Correspondence: (H.C.); (L.P.); (Z.M.)
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Marverti G, Gozzi G, Lauriola A, Ponterini G, Belluti S, Imbriano C, Costi MP, D’Arca D. The 1,10-Phenanthroline Ligand Enhances the Antiproliferative Activity of DNA-Intercalating Thiourea-Pd(II) and -Pt(II) Complexes Against Cisplatin-Sensitive and -Resistant Human Ovarian Cancer Cell Lines. Int J Mol Sci 2019; 20:E6122. [PMID: 31817267 PMCID: PMC6969938 DOI: 10.3390/ijms20246122] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 11/30/2019] [Accepted: 12/02/2019] [Indexed: 11/25/2022] Open
Abstract
Ovarian cancer is the most lethal gynecological malignancy, often because of the frequent insurgence of chemoresistance to the drugs currently used. Thus, new therapeutical agents are needed. We tested the toxicity of 16 new DNA-intercalating agents to cisplatin (cDDP)-sensitive human ovarian carcinoma cell lines and their resistant counterparts. The compounds were the complexes of Pt(II) or Pd(II) with bipyridyl (bipy) and phenanthrolyl (phen) and with four different thiourea ancillary ligands. Within each of the four series of complexes characterized by the same thiourea ligand, the Pd(phen) drugs invariably showed the highest anti-proliferative efficacy. This paralleled both a higher intracellular drug accumulation and a more efficient DNA intercalation than all the other metal-bidentate ligand combinations. The consequent inhibition of topoisomerase II activity led to the greatest inhibition of DNA metabolism, evidenced by the inhibition of the expression of the folate cycle enzymes and a marked perturbation of cell-cycle distribution in both cell lines. These findings indicate that the particular interaction of Pd(II) with phenanthroline confers the best pharmacokinetic and pharmacodynamic properties that make this class of DNA intercalators remarkable inhibitors, even of the resistant cell growth.
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Affiliation(s)
- Gaetano Marverti
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Via Campi 287, 41125 Modena, Italy; (G.G.); (A.L.)
| | - Gaia Gozzi
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Via Campi 287, 41125 Modena, Italy; (G.G.); (A.L.)
| | - Angela Lauriola
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Via Campi 287, 41125 Modena, Italy; (G.G.); (A.L.)
| | - Glauco Ponterini
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 213/d, 41125 Modena, Italy; (G.P.); (S.B.); (C.I.); (M.P.C.)
| | - Silvia Belluti
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 213/d, 41125 Modena, Italy; (G.P.); (S.B.); (C.I.); (M.P.C.)
| | - Carol Imbriano
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 213/d, 41125 Modena, Italy; (G.P.); (S.B.); (C.I.); (M.P.C.)
| | - Maria Paola Costi
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 213/d, 41125 Modena, Italy; (G.P.); (S.B.); (C.I.); (M.P.C.)
| | - Domenico D’Arca
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Via Campi 287, 41125 Modena, Italy; (G.G.); (A.L.)
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50
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Niu Y, Luo G, Xie H, Zhuang Y, Wu X, Li G, Sun W. Photoelectrochemical aptasensor for lead(II) by exploiting the CdS nanoparticle-assisted photoactivity of TiO 2 nanoparticles and by using the quercetin-copper(II) complex as the DNA intercalator. Mikrochim Acta 2019; 186:826. [PMID: 31754803 DOI: 10.1007/s00604-019-3951-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 10/17/2019] [Indexed: 01/27/2023]
Abstract
A photoelectrochemical (PEC) aptasensor for Pb(II) detection is described. A nanocomposite consisting of CdS (2.5 μm) and TiO2 nanoparticles (10 nm) was used as a photoactive material, and gold nanochains (Au NCs) as the support for immobilization of the Pb(II)-binding aptamer. The quercetin-copper(II) complex was further employed as the intercalator for the improvement of the photoactivity by embedding it into dsDNA. In the presence of Pb(II), a Pb(II)-stabilized G-quadruplex was formed between Pb(II) and DNA S1. This is accompanied by unwinding of the dsDNA and the release of the quercetin-copper(II) complex from the surface of the sensor. This results in a decrease of the photocurrent that drops linearly from 5.0 × 10-12 to 1.0 × 10-8 mol·L-1 Pb(II) concentration range with a detection limit of 1.6 × 10-12 mol·L-1. The method was applied to the determination of Pb(II) in various samples and gave satisfactory results. Graphical abstractA photoelectrochemical aptasensor was fabricated for the detection of Pb(II) based on CdS-TiO2 nanocomposite modified indium tin oxide (ITO) electrode. Gold nanochains (AuNCs) were used as anchor to immobilize the aptamers S1 and S2 that form a double helix structure by DNA hybridization. After embedding of quercetin-copper(II) complex as intercalator and electron donor, the concentrations of Pb(II) were determined by the changes of photocurrents.
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Affiliation(s)
- Yanyan Niu
- Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, 571158, People's Republic of China
| | - Guiling Luo
- Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, 571158, People's Republic of China
| | - Hui Xie
- Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, 571158, People's Republic of China
| | - Yujiao Zhuang
- Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, 571158, People's Republic of China
| | - Xianqun Wu
- Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, 571158, People's Republic of China
| | - Guangjiu Li
- Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science of Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People's Republic of China
| | - Wei Sun
- Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, 571158, People's Republic of China.
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