1
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Makanai H, Mochizuki D, Nishihara T, Tanabe K. Hoechst modification by strain-promoted azide-alkyne cycloaddition for transport of functional molecules into the cell nucleus. Bioorg Med Chem Lett 2024; 112:129916. [PMID: 39116953 DOI: 10.1016/j.bmcl.2024.129916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2024] [Revised: 08/02/2024] [Accepted: 08/04/2024] [Indexed: 08/10/2024]
Abstract
The delivery of functional molecules to the cell nucleus enables the visualization of nuclear function and the development of effective medical treatments. In this study, we successfully modified the Hoechst molecule, which is a well-documented nuclear-staining agent, using the strain-promoted azide-alkyne cycloaddition (SPAAC) reaction. We prepared Hoechst derivatives bearing an azide group (Hoe-N3) and characterized their SPAAC reactions in the presence of corresponding molecules with a dibenzylcyclooctyne unit (DBCO). The SPAAC reaction of Hoe-N3 with alkylamine bearing DBCO, fluorescent TAMRA, or Cy5 molecules bearing DBCO led to the formation of the coupling products Hoe-Amine, Hoe-TAMRA, and Hoe-Cy5, respectively. These Hoechst derivatives retained their DNA-binding properties. In addition, Hoe-TAMRA and Hoe-Cy5 exhibited properties of dual accumulation in the cell nucleus and mitochondria. Initial incubation of these molecules in living cells resulted in its accumulation in mitochondria, while after mitochondrial depolarization, it was smoothly released from mitochondria and translocated into the cell nucleus. Thus, mitochondrial depolarization could be monitored by measuring the emission of Hoe-TAMRA and Hoe-Cy5 at the cell nucleus.
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Affiliation(s)
- Hiroki Makanai
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Japan
| | - Daisuke Mochizuki
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Japan
| | - Tatsuya Nishihara
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Japan
| | - Kazuhito Tanabe
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Japan.
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2
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Tsuchikane Y, Watanabe M, Kawaguchi YW, Uehara K, Nishiyama T, Sekimoto H, Tsuchimatsu T. Diversity of genome size and chromosome number in homothallic and heterothallic strains of the Closterium peracerosum-strigosum-littorale complex (Desmidiales, Zygnematophyceae, Streptophyta). JOURNAL OF PHYCOLOGY 2024; 60:654-667. [PMID: 38678594 DOI: 10.1111/jpy.13457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 02/27/2024] [Accepted: 03/31/2024] [Indexed: 05/01/2024]
Abstract
The evolutionary transitions of mating systems between outcrossing and self-fertilization are often suggested to associate with the cytological and genomic changes, but the empirical reports are limited in multicellular organisms. Here we used the unicellular zygnematophycean algae, the Closterium peracerosum-strigosum-littorale (C. psl.) complex, to address whether genomic properties such as genome sizes and chromosome numbers are associated with mating system transitions between homothallism (self-fertility) and heterothallism (self-sterility). Phylogenetic analysis revealed the polyphyly of homothallic strains, suggesting multiple transitions between homothallism and heterothallism in the C. psl. complex. Flow cytometry analysis identified a more than 2-fold genome size variation, ranging from 0.53 to 1.42 Gbp, which was positively correlated with chromosome number variation between strains. Although we did not find consistent trends in genome size change and mating system transitions, the mean chromosome sizes tend to be smaller in homothallic strains than in their relative heterothallic strains. This result suggests that homothallic strains possibly have more fragmented chromosomes, which is consistent with the argument that self-fertilizing populations may tolerate more chromosomal rearrangements.
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Affiliation(s)
- Yuki Tsuchikane
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Tokyo, Japan
| | - Misaki Watanabe
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Tokyo, Japan
| | - Yawako W Kawaguchi
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
- Graduate School of Science and Engineering, Chiba University, Chiba, Japan
| | - Koichi Uehara
- College of Liberal Arts and Sciences, Chiba University, Chiba, Japan
| | - Tomoaki Nishiyama
- Research Center for Experimental Modeling of Human Disease, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Hiroyuki Sekimoto
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Tokyo, Japan
| | - Takashi Tsuchimatsu
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
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3
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Issar U, Arora R, Kakkar R. In silico studies of the interaction of the minor groove binder Hoechst 33258 with B-DNA. J Biomol Struct Dyn 2024; 42:4537-4552. [PMID: 37301606 DOI: 10.1080/07391102.2023.2220807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 05/29/2023] [Indexed: 06/12/2023]
Abstract
Interaction of the minor groove binder, Hoechst 33258, with the Dickerson-Drew DNA dodecamer sequence has been investigated using docking, MM/QM, MM/GBSA and molecular dynamics computations to study the modes of binding and the interactions responsible for the binding. Besides the original Hoechst 33258 ligand (HT), a total of 12 ionization and stereochemical states for the ligand are obtained at the physiological pH and have been docked into B-DNA. These states have one or the other or both benzimidazole rings in protonated states, apart from the piperazine nitrogen, which has a quaternary nitrogen in all the states. Most of these states are found to exhibit good docking scores and free energy of binding with B-DNA. The best docked state has been taken further for molecular dynamics simulations and compared with the original HT. This state is protonated at both benzimidazole rings besides the piperazine ring and hence has very highly negative coulombic interaction energy. In both cases, there are strong coulombic interactions, but these are offset by the almost equally unfavorable solvation energies. Thus, the nonpolar forces, particularly van der Waals contacts, dominate the interaction, and the polar interactions highlight subtle changes in the binding energies, leading to more highly protonated states having more negative binding energies.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Upasana Issar
- Computational Chemistry Laboratory, Department of Chemistry, University of Delhi, Delhi, India
- Department of Chemistry, Kalindi College, University of Delhi, Delhi, India
| | - Richa Arora
- Computational Chemistry Laboratory, Department of Chemistry, University of Delhi, Delhi, India
- Department of Chemistry, Shivaji College, University of Delhi, Delhi, India
| | - Rita Kakkar
- Computational Chemistry Laboratory, Department of Chemistry, University of Delhi, Delhi, India
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4
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Makanai H, Nishihara T, Nishikawa M, Tanabe K. Hoechst-Modification on Oligodeoxynucleotides for Efficient Transport to the Cell Nucleus and Gene Regulation. Chembiochem 2024; 25:e202300645. [PMID: 37984902 DOI: 10.1002/cbic.202300645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 11/15/2023] [Accepted: 11/17/2023] [Indexed: 11/22/2023]
Abstract
Various artificial oligodeoxynucleotides (ODNs) that contribute to gene regulation have been developed and their diversity and multifunctionality have been demonstrated. However, few artificial ODNs are actively transported to the cell nucleus, despite the fact that gene regulation also takes place in both the cell nucleus and the cytoplasm. In this study, to prepare ODNs with the ability to accumulate in the cell nucleus, we introduced Hoechst molecules into ODNs that act as carriers of functional molecules to the cell nucleus (Hoe-ODNs). We synthesized Hoe-ODNs and confirmed that they bound strongly to DNA duplexes. When single-stranded Hoe-ODNs or double-stranded ODNs consisting of Hoe-ODNs and its complementary strand were administered into living cells, both ODNs were efficiently accumulated in the cell nucleus. In addition, antisense ODNs, which were tethered with Hoechst unit, were delivered into the cell nucleus and efficiently suppressed the expression of their target RNA. Thus, we constructed a delivery system that enables the transport of ODNs into cell nucleus.
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Affiliation(s)
- Hiroki Makanai
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, 252-5258, Japan
| | - Tatsuya Nishihara
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, 252-5258, Japan
| | - Makiya Nishikawa
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Kazuhito Tanabe
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, 252-5258, Japan
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5
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Simmons CR, Buchberger A, Henry SJW, Novacek A, Fahmi NE, MacCulloch T, Stephanopoulos N, Yan H. Site-Specific Arrangement and Structure Determination of Minor Groove Binding Molecules in Self-Assembled Three-Dimensional DNA Crystals. J Am Chem Soc 2023; 145:26075-26085. [PMID: 37987645 PMCID: PMC10789492 DOI: 10.1021/jacs.3c07802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
The structural analysis of guest molecules in rationally designed and self-assembling DNA crystals has proven an elusive goal since its conception. Oligonucleotide frameworks provide an especially attractive route toward studying DNA-binding molecules by using three-dimensional lattices with defined sequence and structure. In this work, we site-specifically position a suite of minor groove binding molecules, and solve their structures via X-ray crystallography as a proof-of-principle toward scaffolding larger guest species. Two crystal motifs were used to precisely immobilize the molecules DAPI, Hoechst, and netropsin at defined positions in the lattice, allowing us to control occupancy within the crystal. We also solved the structure of a three-ring imidazole-pyrrole-pyrrole polyamide molecule, which sequence-specifically packs in an antiparallel dimeric arrangement within the minor groove. Finally, we engineered a crystal designed to position both netropsin and the polyamide at two distinct locations within the same lattice. Our work elucidates the design principles for the spatial arrangement of functional guests within lattices and opens new potential opportunities for the use of DNA crystals to display and structurally characterize small molecules, peptides, and ultimately proteins of unknown structure.
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Affiliation(s)
- Chad R Simmons
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University 1001 S. McAllister Ave., Tempe, Arizona 85287, United States
| | - Alex Buchberger
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University 1001 S. McAllister Ave., Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287,United States
| | - Skylar J W Henry
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University 1001 S. McAllister Ave., Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287,United States
| | - Alexandra Novacek
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University 1001 S. McAllister Ave., Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287,United States
| | - Nour Eddine Fahmi
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University 1001 S. McAllister Ave., Tempe, Arizona 85287, United States
| | - Tara MacCulloch
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University 1001 S. McAllister Ave., Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287,United States
| | - Nicholas Stephanopoulos
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University 1001 S. McAllister Ave., Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287,United States
| | - Hao Yan
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University 1001 S. McAllister Ave., Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287,United States
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6
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Simmons CR, Buchberger A, Henry SJW, Novacek A, Fahmi NE, MacCulloch T, Stephanopoulos N, Yan H. Site-specific arrangement and structure determination of minor groove binding molecules in self-assembled three-dimensional DNA crystals. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.10.561756. [PMID: 37873139 PMCID: PMC10592734 DOI: 10.1101/2023.10.10.561756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
The structural analysis of guest molecules in rationally designed and self-assembling DNA crystals has proven elusive since its conception. Oligonucleotide frameworks provide an especially attractive route towards studying DNA-binding molecules by using three-dimensional lattices with defined sequence and structure. In this work, we site-specifically position a suite of minor groove binding molecules, and solve their structures via x-ray crystallography, as a proof-of-principle towards scaffolding larger guest species. Two crystal motifs were used to precisely immobilize the molecules DAPI, Hoechst, and netropsin at defined positions in the lattice, allowing us to control occupancy within the crystal. We also solved the structure of a three-ring imidazole-pyrrole-pyrrole polyamide molecule, which sequence-specifically packs in an anti-parallel dimeric arrangement within the minor groove. Finally, we engineered a crystal designed to position both netropsin and the polyamide at two distinct locations within the same lattice. Our work elucidates the design principles for the spatial arrangement of functional guests within lattices and opens new potential opportunities for the use of DNA crystals to display and structurally characterize small molecules, peptides, and ultimately proteins of unknown structure.
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7
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Le D, Akiyama T, Weiss D, Kim M. Dissociation kinetics of small-molecule inhibitors in Escherichia coli is coupled to physiological state of cells. Commun Biol 2023; 6:223. [PMID: 36841892 PMCID: PMC9968327 DOI: 10.1038/s42003-023-04604-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 02/16/2023] [Indexed: 02/27/2023] Open
Abstract
Bioactive small-molecule inhibitors represent a treasure chest for future drugs. In vitro high-throughput screening is a common approach to identify the small-molecule inhibitors that bind tightly to purified targets. Here, we investigate the inhibitor-target binding/unbinding kinetics in E. coli cells using a benzimidazole-derivative DNA inhibitor as a model system. We find that its unbinding rate is not constant but depends on cell growth rate. This dependence is mediated by the cellular activity, forming a feedback loop with the inhibitor's activity. In accordance with this feedback, we find cell-to-cell heterogeneity in inhibitor-target interaction, leading to co-existence of two distinct subpopulations: actively growing cells that dissociate the inhibitors from the targets and non-growing cells that do not. We find similar heterogeneity for other clinical DNA inhibitors. Our studies reveal a mechanism that couples inhibitor-target kinetics to cell physiology and demonstrate the significant effect of this coupling on drug efficacy.
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Affiliation(s)
- Dai Le
- Department of Physics, Emory University, Atlanta, GA, 30322, USA
- Graduate Division of Biological and Biomedical Sciences, Emory University, Atlanta, GA, 30322, USA
| | - Tatsuya Akiyama
- Department of Physics, Emory University, Atlanta, GA, 30322, USA
- Graduate Division of Biological and Biomedical Sciences, Emory University, Atlanta, GA, 30322, USA
| | - David Weiss
- Graduate Division of Biological and Biomedical Sciences, Emory University, Atlanta, GA, 30322, USA
- Division of Infectious Diseases, Department of Medicine, Emory University, Atlanta, GA, 30322, USA
- Antibiotic Research Center, Emory University, Atlanta, GA, 30322, USA
| | - Minsu Kim
- Department of Physics, Emory University, Atlanta, GA, 30322, USA.
- Graduate Division of Biological and Biomedical Sciences, Emory University, Atlanta, GA, 30322, USA.
- Antibiotic Research Center, Emory University, Atlanta, GA, 30322, USA.
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8
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Flick Jaecker F, Almeida JA, Krull CM, Pathak A. Nucleoli in epithelial cell collectives respond to tumorigenic, spatial, and mechanical cues. Mol Biol Cell 2022; 33:br19. [PMID: 35830599 PMCID: PMC9582805 DOI: 10.1091/mbc.e22-02-0070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Cancer cells are known to have larger nucleoli, consistent with their higher transcriptional and translational demands. Meanwhile, on stiff extracellular matrix, normal epithelial cells can exhibit genomic and proteomic mechanoactivation toward tumorigenic transformations, such as epithelial-mesenchymal transition and enhanced migration. However, while nucleolar bodies regulate the protein synthesis required for mechanosensation, it remains unknown whether mechanical and spatial extracellular cues can in turn alter nucleoli. Here, we culture mammary epithelial cell sheets on matrices of varying stiffness and show that cancer cells have more nucleoli, with nucleoli occupying larger areas compared with normal cells. By contrast, within normal epithelial sheets, stiffer matrices and leader positioning of cells induce larger nucleolar areas and more nucleolar bodies over time. The observed leader-follower nucleolar differences stem from distinct rates of cell cycle progression. In the nucleoplasm, leader cells on stiffer matrices exhibit higher heterochromatin marker expression and DNA compaction around nucleolar bodies. Overall, our findings advance the emerging framework of cellular mechanobiology in which mechanical cues from the extracellular matrix transmit into the nucleoplasm to alter nucleolar composition, potentially resulting in mechanosensitive ribosomal biogenesis. Ultimately, this proposed mechanosensitivity of nucleoli and associated protein synthesis could have wide implications in disease, development, and regeneration.
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Affiliation(s)
| | - José A Almeida
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63130
| | - Carly M Krull
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63130
| | - Amit Pathak
- Department of Mechanical Engineering & Materials Science and.,Department of Biomedical Engineering, Washington University, St. Louis, MO 63130
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9
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Jin X, Sun T, Wu Z, Wang D, Hu F, Xu J, Li X, Qiu J. Label-free hairpin probe for the rapid detection of Hg(II) based on T-Hg(II)-T. Anal Chim Acta 2022; 1221:340113. [DOI: 10.1016/j.aca.2022.340113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 06/11/2022] [Accepted: 06/20/2022] [Indexed: 11/30/2022]
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10
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Sakamoto T, Yu Z, Otani Y. Dual-Color Fluorescence Switch-On Probe for Imaging G-Quadruplex and Double-Stranded DNA in Living Cells. Anal Chem 2022; 94:4269-4276. [PMID: 35234461 DOI: 10.1021/acs.analchem.1c04804] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A tripodal quinone-cyanine dye having one donor and three acceptors, that is, one quinone and three N-methylbenzothiazolium moieties, QCy(MeBT)3, was synthesized by simple Knoevenagel condensation between 2-hydroxybenzene-1,3,5-tricarbaldehyde and N-methyl-2-methylbenzothiazolium iodide. The 700 nm (λex, 570 nm) and 600 nm (λex, 470 nm) fluorescence emission of QCy(MeBT)3 was significantly and individually enhanced with the addition of G-quadruplex (G4) DNA and double-stranded DNA (dsDNA), respectively. The results of docking simulations and the response against the viscosity change revealed that the dual-fluorescence response was caused by the difference in the binding mode of QCy(MeBT)3 depending on the DNA structure. The results of fluorescence microscopy imaging experiments using QCy(MeBT)3 suggested that G4 DNAs and dsDNAs in the cell nucleus can be imaged with near-infrared (NIR, 700 nm) and red (600 nm) fluorescence emissions. Furthermore, pyridostatin-induced G4 formation in the living cells can be imaged with NIR fluorescence. The results indicated that QCy(MeBT)3 has huge potential to be a NIR-fluorescent molecular probe for analyzing the structural dynamics of nucleic acids in living cells with a normal fluorescence microscope.
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Affiliation(s)
- Takashi Sakamoto
- Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640-8510, Japan.,Graduate School of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640-8510, Japan
| | - Zehui Yu
- Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640-8510, Japan
| | - Yuto Otani
- Graduate School of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640-8510, Japan
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11
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Sliwinska E, Loureiro J, Leitch IJ, Šmarda P, Bainard J, Bureš P, Chumová Z, Horová L, Koutecký P, Lučanová M, Trávníček P, Galbraith DW. Application-based guidelines for best practices in plant flow cytometry. Cytometry A 2021; 101:749-781. [PMID: 34585818 DOI: 10.1002/cyto.a.24499] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 08/10/2021] [Accepted: 08/26/2021] [Indexed: 12/15/2022]
Abstract
Flow cytometry (FCM) is currently the most widely-used method to establish nuclear DNA content in plants. Since simple, 1-3-parameter, flow cytometers, which are sufficient for most plant applications, are commercially available at a reasonable price, the number of laboratories equipped with these instruments, and consequently new FCM users, has greatly increased over the last decade. This paper meets an urgent need for comprehensive recommendations for best practices in FCM for different plant science applications. We discuss advantages and limitations of establishing plant ploidy, genome size, DNA base composition, cell cycle activity, and level of endoreduplication. Applications of such measurements in plant systematics, ecology, molecular biology research, reproduction biology, tissue cultures, plant breeding, and seed sciences are described. Advice is included on how to obtain accurate and reliable results, as well as how to manage troubleshooting that may occur during sample preparation, cytometric measurements, and data handling. Each section is followed by best practice recommendations; tips as to what specific information should be provided in FCM papers are also provided.
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Affiliation(s)
- Elwira Sliwinska
- Laboratory of Molecular Biology and Cytometry, Department of Agricultural Biotechnology, UTP University of Science and Technology, Bydgoszcz, Poland
| | - João Loureiro
- Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
| | - Ilia J Leitch
- Kew Science Directorate, Royal Botanic Gardens, Kew, Richmond, Surrey, UK
| | - Petr Šmarda
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Jillian Bainard
- Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, Swift Current, Saskatchewan, Canada
| | - Petr Bureš
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Zuzana Chumová
- Czech Academy of Sciences, Institute of Botany, Průhonice, Czech Republic.,Department of Botany, Faculty of Science, Charles University, Prague, Czech Republic
| | - Lucie Horová
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Petr Koutecký
- Department of Botany, Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic
| | - Magdalena Lučanová
- Czech Academy of Sciences, Institute of Botany, Průhonice, Czech Republic.,Department of Botany, Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic
| | - Pavel Trávníček
- Czech Academy of Sciences, Institute of Botany, Průhonice, Czech Republic
| | - David W Galbraith
- School of Plant Sciences, BIO5 Institute, Arizona Cancer Center, Department of Biomedical Engineering, University of Arizona, Tucson, Arizona, USA.,Henan University, School of Life Sciences, State Key Laboratory of Crop Stress Adaptation and Improvement, State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, Kaifeng, China
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12
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Ganguly S, Murugan NA, Ghosh D, Narayanaswamy N, Govindaraju T, Basu G. DNA Minor Groove-Induced cis- trans Isomerization of a Near-Infrared Fluorescent Probe. Biochemistry 2021; 60:2084-2097. [PMID: 34142803 DOI: 10.1021/acs.biochem.1c00281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The discovery of small molecules that exhibit turn-on far-red or near-infrared (NIR) fluorescence upon DNA binding and understanding how they bind DNA are important for imaging and bioanalytical applications. Here we report the DNA-bound structure and the DNA binding mechanism of quinone cyanine dithiazole (QCy-DT), a recently reported AT-specific turn-on NIR fluorescent probe for double-stranded DNA. The nuclear magnetic resonance (NMR)-derived structure showed minor groove binding but no specific ligand-DNA interactions, consistent with an endothermic and entropy-driven binding mechanism deduced from isothermal titration calorimetry. Minor groove binding is typically fast because it minimally perturbs the DNA structure. However, QCy-DT exhibited unusually slow DNA binding. The cyanine-based probe is capable of cis-trans isomerization due to overlapping methine bridges, with 16 possible slowly interconverting cis/trans isomers. Using NMR, density functional theory, and free energy calculations, we show that the DNA-free and DNA-bound environments of QCy-DT prefer distinctly different isomers, indicating that the origin of the slow kinetics is a cis-trans isomerization and that the minor groove preferentially selects an otherwise unstable cis/trans isomer of QCy-DT. Flux analysis showed the conformational selection pathway to be the dominating DNA binding mechanism at low DNA concentrations, which switches to the induced fit pathway at high DNA concentrations. This report of cis/trans isomerization of a ligand, upon binding the DNA minor groove, expands the prevailing understanding of unique discriminatory powers of the minor groove and has an important bearing on using polymethine cyanine dyes to probe the kinetics of molecular interactions.
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Affiliation(s)
- Sudakshina Ganguly
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata 700054, West Bengal, India
| | - N Arul Murugan
- Division of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, S-106 91 Stockholm, Sweden
| | - Debasis Ghosh
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - Nagarjun Narayanaswamy
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - Thimmaiah Govindaraju
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - Gautam Basu
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata 700054, West Bengal, India
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13
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Uno K, Sugimoto N, Sato Y. N-aryl pyrido cyanine derivatives are nuclear and organelle DNA markers for two-photon and super-resolution imaging. Nat Commun 2021; 12:2650. [PMID: 33976192 PMCID: PMC8113587 DOI: 10.1038/s41467-021-23019-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 04/08/2021] [Indexed: 11/10/2022] Open
Abstract
Live cell imaging using fluorescent DNA markers are an indispensable molecular tool in various biological and biomedical fields. It is a challenge to develop DNA probes that avoid UV light photo-excitation, have high specificity for DNA, are cell-permeable and are compatible with cutting-edge imaging techniques such as super-resolution microscopy. Herein, we present N-aryl pyrido cyanine (N-aryl-PC) derivatives as a class of long absorption DNA markers with absorption in the wide range of visible light. The high DNA specificity and membrane permeability allow the staining of both organelle DNA as well as nuclear DNA, in various cell types, including plant tissues, without the need for washing post-staining. N-aryl-PC dyes are also highly compatible with a separation of photon by lifetime tuning method in stimulated emission depletion microscopy (SPLIT-STED) for super-resolution imaging as well as two-photon microscopy for deep tissue imaging, making it a powerful tool in the life sciences.
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Affiliation(s)
- Kakishi Uno
- Graduate School of Science, Nagoya University, Nagoya, Japan
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Nagisa Sugimoto
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya, Japan
| | - Yoshikatsu Sato
- Graduate School of Science, Nagoya University, Nagoya, Japan.
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya, Japan.
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14
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Ha VLT, Erlitzki N, Farahat AA, Kumar A, Boykin DW, Poon GMK. Dissecting Dynamic and Hydration Contributions to Sequence-Dependent DNA Minor Groove Recognition. Biophys J 2020; 119:1402-1415. [PMID: 32898478 DOI: 10.1016/j.bpj.2020.08.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 07/13/2020] [Accepted: 08/10/2020] [Indexed: 10/23/2022] Open
Abstract
Sequence selectivity is a critical attribute of DNA-binding ligands and underlines the need for detailed molecular descriptions of binding in representative sequence contexts. We investigated the binding and volumetric properties of DB1976, a model bis(benzimidazole)-selenophene diamidine compound with emerging therapeutic potential in acute myeloid leukemia, debilitating fibroses, and obesity-related liver dysfunction. To sample the scope of cognate DB1976 target sites, we evaluated three dodecameric duplexes spanning >103-fold in binding affinity. The attendant changes in partial molar volumes varied substantially, but not in step with binding affinity, suggesting distinct modes of interactions in these complexes. Specifically, whereas optimal binding was associated with loss of hydration water, low-affinity binding released more hydration water. Explicit-atom molecular dynamics simulations showed that minor groove binding perturbed the conformational dynamics and hydration at the termini and interior of the DNA in a sequence-dependent manner. The impact of these distinct local dynamics on hydration was experimentally validated by domain-specific interrogation of hydration with salt, which probed the charged axial surfaces of oligomeric DNA preferentially over the uncharged termini. Minor groove recognition by DB1976, therefore, generates dynamically distinct domains that can make favorable contributions to hydration release in both high- and low-affinity binding. Because ligand binding at internal sites of DNA oligomers modulates dynamics at the termini, the results suggest both short- and long-range dynamic effects along the DNA target that can influence their effectiveness as low-MW competitors of protein binding.
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Affiliation(s)
- Van L T Ha
- Department of Chemistry, Georgia State University, Atlanta, Georgia
| | - Noa Erlitzki
- Department of Chemistry, Georgia State University, Atlanta, Georgia
| | - Abdelbasset A Farahat
- Department of Chemistry, Georgia State University, Atlanta, Georgia; Department of Pharmaceutical and Medicinal Chemistry, California Northstate University, Elk Grove, California
| | - Arvind Kumar
- Department of Chemistry, Georgia State University, Atlanta, Georgia
| | - David W Boykin
- Department of Chemistry, Georgia State University, Atlanta, Georgia
| | - Gregory M K Poon
- Department of Chemistry, Georgia State University, Atlanta, Georgia; Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia.
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15
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Vardevanyan PO, Parsadanyan MA, Antonyan AP, Shahinyan MA, Karapetyan AT. Spectroscopic study of interaction of various GC-content DNA with Hoechst 33258 depending on Na + concentration. J Biomol Struct Dyn 2020; 39:1519-1523. [PMID: 32066326 DOI: 10.1080/07391102.2020.1730244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Poghos O Vardevanyan
- Department of Biophysics, Faculty of Biology, Yerevan State University, Yerevan, Armenia
| | - Marine A Parsadanyan
- Department of Biophysics, Faculty of Biology, Yerevan State University, Yerevan, Armenia
| | - Ara P Antonyan
- Department of Biophysics, Faculty of Biology, Yerevan State University, Yerevan, Armenia
| | - Mariam A Shahinyan
- Department of Biophysics, Faculty of Biology, Yerevan State University, Yerevan, Armenia
| | - Armen T Karapetyan
- Department of Physics and Electrotecnics, National University of Architecture and Construction of Armenia, Yerevan, Armenia
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16
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Sardana D, Yadav K, Shweta H, Clovis NS, Alam P, Sen S. Origin of Slow Solvation Dynamics in DNA: DAPI in Minor Groove of Dickerson-Drew DNA. J Phys Chem B 2019; 123:10202-10216. [PMID: 31589442 DOI: 10.1021/acs.jpcb.9b09275] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The measurement and understanding of collective solvation dynamics in DNA have vital biological implications, as protein and ligand binding to DNA can be directly controlled by complex electrostatic interactions of anionic DNA and surrounding dipolar water, and ions. Time-resolved fluorescence Stokes shift (TRFSS) experiments revealed anomalously slow solvation dynamics in DNA much beyond 100 ps that follow either power-law or slow multiexponential decay over several nanoseconds. The origin of such dispersed dynamics remains difficult to understand. Here we compare results of TRFSS experiments to molecular dynamics (MD) simulations of well-known 4',6-diamidino-2-phenylindole (DAPI)/Dickerson-Drew DNA complex over five decades of time from 100 fs to 10 ns to understand the origin of such dispersed dynamics. We show that the solvation time-correlation function (TCF) calculated from 200 ns simulation trajectory (total 800 ns) captures most features of slow dynamics as measured in TRFSS experiments. Decomposition of TCF into individual components unravels that slow dynamics originating from dynamically coupled DNA-water motion, although contribution from coupled water-Na+ motion is non-negligible. The analysis of residence time of water molecules around the probe (DAPI) reveals broad distribution from ∼6 ps to ∼3.5 ns: Several (49 nos.) water molecules show residences time greater than 500 ps, of which at least 14 water molecules show residence times of more than 1 ns in the first solvation shell of DAPI. Most of these slow water molecules are found to occupy two hydration sites in the minor groove near DAPI binding site. The residence time of Na+, however, is found to vary within ∼17-120 ps. Remarkably, we find that freezing the DNA fluctuations in simulation eliminates slower dynamics beyond ∼100 ps, where water and Na+ dynamics become faster, although strong anticorrelation exists between them. These results indicate that primary origin of slow dynamics lies within the slow fluctuations of DNA parts that couple with nearby slow water and ions to control the dispersed collective solvation dynamics in DNA minor groove.
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Affiliation(s)
- Deepika Sardana
- Spectroscopy Laboratory, School of Physical Sciences , Jawaharlal Nehru University , New Delhi 110067 , India
| | - Kavita Yadav
- Spectroscopy Laboratory, School of Physical Sciences , Jawaharlal Nehru University , New Delhi 110067 , India
| | - Him Shweta
- Spectroscopy Laboratory, School of Physical Sciences , Jawaharlal Nehru University , New Delhi 110067 , India
| | - Ndege Simisi Clovis
- Spectroscopy Laboratory, School of Physical Sciences , Jawaharlal Nehru University , New Delhi 110067 , India
| | - Parvez Alam
- Spectroscopy Laboratory, School of Physical Sciences , Jawaharlal Nehru University , New Delhi 110067 , India
| | - Sobhan Sen
- Spectroscopy Laboratory, School of Physical Sciences , Jawaharlal Nehru University , New Delhi 110067 , India
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17
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Fluorescent determination of micro-quantities of RNA using Hoechst 33258 and binase. Anal Biochem 2019; 576:5-8. [PMID: 30958999 DOI: 10.1016/j.ab.2019.04.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 03/27/2019] [Accepted: 04/02/2019] [Indexed: 11/20/2022]
Abstract
Detection of small amounts of RNA in various biological samples is an important applied task. Using fluorescence spectroscopy, the hydrolysis by binase of rRNA and tRNA, stained with Hoechst 33258, in aqueous solutions was investigated. The binding constant of Hoechst with rRNA is 106 M-1. Specific hydrolysis of rRNA and tRNA by binase during 1-2 min at room temperature leads to a multiple decrease in fluorescence of the dye. This rapid hydrolysis goes to large polynucleotide fragments, but not to short oligonucleotides. The binding constant of binase with rRNA is about of 2.5 × 106 M-1, which is several dozen times higher than with oligonucleotides. The susceptibility to binase attack depends on the secondary structure of RNA, determined by non-canonical ribonucleotides. The developed highly sensitive fluorescent method can be used for the rapid selective detection of trace amounts of rRNA or tRNA, as well as for studying the physicochemical properties of these RNAs. Using the proposed method, one can confidently detect RNA from 10-7 M.
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18
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Zhang S, Assaf KI, Huang C, Hennig A, Nau WM. Ratiometric DNA sensing with a host-guest FRET pair. Chem Commun (Camb) 2019; 55:671-674. [PMID: 30565597 DOI: 10.1039/c8cc09126a] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A supramolecular host-guest FRET pair based on a carboxyfluorescein-labelled cucurbit[7]uril (CB7-CF, as acceptor) and the fluorescent dye 4',6-diamidino-2-phenylindole (DAPI, as donor) is developed for sensing of DNA. In comparison to the commercial DNA staining dye SYBR Green I, the new chemosensing ensemble offers dual-emission signals, which allows a linear ratiometric response over a wide concentration range.
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Affiliation(s)
- Shuai Zhang
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759, Bremen, Germany.
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19
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Elgart V, Lin JR, Loscalzo J. Determinants of drug-target interactions at the single cell level. PLoS Comput Biol 2018; 14:e1006601. [PMID: 30571695 PMCID: PMC6319770 DOI: 10.1371/journal.pcbi.1006601] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 01/04/2019] [Accepted: 10/29/2018] [Indexed: 12/18/2022] Open
Abstract
The physiochemical determinants of drug-target interactions in the microenvironment of the cell are complex and generally not defined by simple diffusion and intrinsic chemical reactivity. Non-specific interactions of drugs and macromolecules in cells are rarely considered formally in assessing pharmacodynamics. Here, we demonstrate that non-specific interactions lead to very slow incorporation kinetics of DNA binding drugs. We observe a rate of drug incorporation in cell nuclei three orders of magnitude slower than in vitro due to anomalous drug diffusion within cells. This slow diffusion, however, has an advantageous consequence: it leads to virtually irreversible binding of the drug to specific DNA targets in cells. We show that non-specific interactions drive slow drug diffusion manifesting as slow reaction front propagation. We study the effect of non-specific interactions in different cellular compartments by permeabilization of plasma and nuclear membranes in order to pinpoint differential compartment effects on variability in intracellular drug kinetics. These results provide the basis for a comprehensive model of the determinants of intracellular diffusion of small-molecule drugs, their target-seeking trajectories, and the consequences of these processes on the apparent kinetics of drug-target interactions. Small-molecule drug design assumes target binding of high affinity. Most small molecules can interact with other macromolecules in the cell ‘nonspecifically,’ i.e., with significantly lower affinity. The extent to which these nonspecific interactions influence the availability and action of the drug for its specific target depends upon the relative concentrations of drug, the specific target, and nonspecific targets. The structure of the cell is quite crowded with a highly non-uniform distribution of macromolecules that can interact with the drug of interest both specifically and nonspecifically. Thus, some compartments or micro-domains within the cell may have a comparatively high concentration of nonspecific targets, sufficient to trap the drug and retard its diffusion toward the specific target. Here, using small-molecule binding to DNA and single cell monitoring, we demonstrate that this effect results in apparently anomalous small molecule-DNA binding kinetics in cells at rates that are 1000-fold slower than in a homogeneous, dilute, aqueous environment. This slow intracellular diffusion, however, has an advantageous consequence: it leads to virtually irreversible binding of the small molecule (drug) to specific DNA targets in cells. We study and quantify the effect of nonspecific interactions between small DNA-binding molecules, including known DNA-binding drugs, in different cellular compartments in order to identify factors that account for the variability in binding kinetics among individual cells.
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Affiliation(s)
- Vlad Elgart
- Laboratory for Systems Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
| | - Jia-Ren Lin
- Laboratory for Systems Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Joseph Loscalzo
- Laboratory for Systems Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- * E-mail:
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20
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21
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Fritzsch R, Donaldson PM, Greetham GM, Towrie M, Parker AW, Baker MJ, Hunt NT. Rapid Screening of DNA–Ligand Complexes via 2D-IR Spectroscopy and ANOVA–PCA. Anal Chem 2018; 90:2732-2740. [DOI: 10.1021/acs.analchem.7b04727] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robby Fritzsch
- Department
of Physics, University of Strathclyde, SUPA, 107 Rottenrow East, Glasgow G4 0NG, U.K
| | - Paul M. Donaldson
- STFC
Central Laser Facility, Research Complex at Harwell, Rutherford Appleton
Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0QX, U.K
| | - Gregory M. Greetham
- STFC
Central Laser Facility, Research Complex at Harwell, Rutherford Appleton
Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0QX, U.K
| | - Michael Towrie
- STFC
Central Laser Facility, Research Complex at Harwell, Rutherford Appleton
Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0QX, U.K
| | - Anthony W. Parker
- STFC
Central Laser Facility, Research Complex at Harwell, Rutherford Appleton
Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0QX, U.K
| | - Matthew J. Baker
- WestCHEM,
Department of Pure and Applied Chemistry, Technology and Innovation
Centre, University of Strathclyde, 99 George Street, Glasgow G1 1RD, U.K
| | - Neil T. Hunt
- Department
of Physics, University of Strathclyde, SUPA, 107 Rottenrow East, Glasgow G4 0NG, U.K
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22
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Saha A, Kizaki S, Han JH, Yu Z, Sugiyama H. UVA irradiation of BrU-substituted DNA in the presence of Hoechst 33258. Bioorg Med Chem 2018; 26:37-40. [PMID: 29170027 DOI: 10.1016/j.bmc.2017.11.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 11/02/2017] [Accepted: 11/04/2017] [Indexed: 01/15/2023]
Abstract
Given that our knowledge of DNA repair is limited because of the complexity of the DNA system, a technique called UVA micro-irradiation has been developed that can be used to visualize the recruitment of DNA repair proteins at double-strand break (DSB) sites. Interestingly, Hoechst 33258 was used under micro-irradiation to sensitize 5-bromouracil (BrU)-labelled DNA, causing efficient DSBs. However, the molecular basis of DSB formation under UVA micro-irradiation remains unknown. Herein, we investigated the mechanism of DSB formation under UVA micro-irradiation conditions. Our results suggest that the generation of a uracil-5-yl radical through electron transfer from Hoechst 33258 to BrU caused DNA cleavage preferentially at self-complementary 5'-AABrUBrU-3' sequences to induce DSB. We also investigated the DNA cleavage in the context of the nucleosome to gain a better understanding of UVA micro-irradiation in a cell-like model. We found that DNA cleavage occurred in both core and linker DNA regions although its efficiency reduced in core DNA.
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Affiliation(s)
- Abhijit Saha
- Department of Science, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Seiichiro Kizaki
- Department of Science, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Ji Hoon Han
- Department of Science, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Zutao Yu
- Department of Science, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Hiroshi Sugiyama
- Department of Science, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8501, Japan; Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Yoshida Ushinomiya-cho, Sakyo, Kyoto 606-8502, Japan.
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23
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Sakamoto T, Hasegawa D, Fujimoto K. Disassembly-driven signal turn-on probes for bimodal detection of DNA with 19F NMR and fluorescence. Org Biomol Chem 2018; 16:7157-7162. [DOI: 10.1039/c8ob02218f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembling molecular probes that can detect DNA in a 19F NMR and fluorescence signal turn-on manner were successfully developed.
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Affiliation(s)
- Takashi Sakamoto
- Faculty of Systems Engineering
- Wakayama University
- Wakayama 640-8510
- Japan
| | - Daisaku Hasegawa
- School of Materials Science
- Japan Advanced Institute of Science and Technology
- Nomi
- Japan
| | - Kenzo Fujimoto
- School of Materials Science
- Japan Advanced Institute of Science and Technology
- Nomi
- Japan
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24
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Shweta H, Singh MK, Yadav K, Verma SD, Pal N, Sen S. Effect of T·T Mismatch on DNA Dynamics Probed by Minor Groove Binders: Comparison of Dynamic Stokes Shifts of Hoechst and DAPI. J Phys Chem B 2017; 121:10735-10748. [PMID: 28922599 DOI: 10.1021/acs.jpcb.7b06937] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Recognition of DNA base mismatches and their subsequent repair by enzymes is vital for genomic stability. However, it is difficult to comprehend such a process in which enzymes sense and repair different types of mismatches with different ability. It has been suggested that the differential structural changes of mismatched bases act as cues to the repair enzymes, although the effect of such DNA structural changes on surrounding water and ion dynamics is inevitable due to strong electrostatic coupling among them. Thus, collective dynamics of DNA, water, and ions near the mismatch site is believed to be important for mismatch recognition and repair mechanism. Here we show that introduction of a T·T mismatch in the minor groove of DNA induces dispersed (collective) power-law solvation dynamics (of exponent ∼0.24), measured by monitoring the time-resolved fluorescence Stokes shifts (TRFSS) of two popular minor groove binders (Hoechst 33258 and DAPI) over five decades of time from 100 fs to 10 ns. The same ligands however sense different dynamics (power-law of exponent ∼0.15 or power-law multiplied with biexponential relaxation) in the minor groove of normal-DNA. The similar fluorescence anisotropy decays of ligands measured in normal- and T·T-DNA suggest that Stokes shift dynamics and their changes in T·T-DNA purely originate from the solvation process, and not from any internal rotational motion of probe-ligands. The dispersed power-law solvation dynamics seen in T·T-DNA indicate that the ligands do not sense any particular (exponential) relaxation specific to T·T wobbling and/or other conformational changes. This could be the reason why T·T mismatch is recognized by enzymes with lower efficiency compared to purine-pyrimidine and purine-purine mismatches.
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Affiliation(s)
- Him Shweta
- Spectroscopy Laboratory, School of Physical Sciences, Jawaharlal Nehru University , New Delhi 110067, India
| | - Moirangthem Kiran Singh
- Spectroscopy Laboratory, School of Physical Sciences, Jawaharlal Nehru University , New Delhi 110067, India
| | - Kavita Yadav
- Spectroscopy Laboratory, School of Physical Sciences, Jawaharlal Nehru University , New Delhi 110067, India
| | - Sachin Dev Verma
- Spectroscopy Laboratory, School of Physical Sciences, Jawaharlal Nehru University , New Delhi 110067, India
| | - Nibedita Pal
- Spectroscopy Laboratory, School of Physical Sciences, Jawaharlal Nehru University , New Delhi 110067, India
| | - Sobhan Sen
- Spectroscopy Laboratory, School of Physical Sciences, Jawaharlal Nehru University , New Delhi 110067, India
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25
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Hoechst-naphthalimide dyad with dual emissions as specific and ratiometric sensor for nucleus DNA damage. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2017.07.030] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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26
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Ramakers LAI, Hithell G, May JJ, Greetham GM, Donaldson PM, Towrie M, Parker AW, Burley GA, Hunt NT. 2D-IR Spectroscopy Shows that Optimized DNA Minor Groove Binding of Hoechst33258 Follows an Induced Fit Model. J Phys Chem B 2017; 121:1295-1303. [PMID: 28102674 DOI: 10.1021/acs.jpcb.7b00345] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The induced fit binding model describes a conformational change occurring when a small molecule binds to its biomacromolecular target. The result is enhanced noncovalent interactions between the ligand and biomolecule. Induced fit is well-established for small molecule-protein interactions, but its relevance to small molecule-DNA binding is less clear. We investigate the molecular determinants of Hoechst33258 binding to its preferred A-tract sequence relative to a suboptimal alternating A-T sequence. Results from two-dimensional infrared spectroscopy, which is sensitive to H-bonding and molecular structure changes, show that Hoechst33258 binding results in loss of the minor groove spine of hydration in both sequences, but an additional perturbation of the base propeller twists occurs in the A-tract binding region. This induced fit maximizes favorable ligand-DNA enthalpic contributions in the optimal binding case and demonstrates that controlling the molecular details that induce subtle changes in DNA structure may hold the key to designing next-generation DNA-binding molecules.
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Affiliation(s)
- Lennart A I Ramakers
- Department of Physics, University of Strathclyde, SUPA , 107 Rottenrow East, Glasgow G4 0NG, United Kingdon
| | - Gordon Hithell
- Department of Physics, University of Strathclyde, SUPA , 107 Rottenrow East, Glasgow G4 0NG, United Kingdon
| | - John J May
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde , 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Gregory M Greetham
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory , Harwell, Oxford OX11 0QX, United Kingdom
| | - Paul M Donaldson
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory , Harwell, Oxford OX11 0QX, United Kingdom
| | - Michael Towrie
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory , Harwell, Oxford OX11 0QX, United Kingdom
| | - Anthony W Parker
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory , Harwell, Oxford OX11 0QX, United Kingdom
| | - Glenn A Burley
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde , 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Neil T Hunt
- Department of Physics, University of Strathclyde, SUPA , 107 Rottenrow East, Glasgow G4 0NG, United Kingdon
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27
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Carreño A, Aros AE, Otero C, Polanco R, Gacitúa M, Arratia-Pérez R, Fuentes JA. Substituted bidentate and ancillary ligands modulate the bioimaging properties of the classical Re(i) tricarbonyl core with yeasts and bacteria. NEW J CHEM 2017. [DOI: 10.1039/c6nj03792e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Six classical rhenium(i) tricarbonyl complexes were investigated for their ability to be used as dyes for bioimaging in walled cells.
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Affiliation(s)
- Alexander Carreño
- Center of Applied Nanosciences (CENAP)
- Universidad Andres Bello
- Santiago
- Chile
- Núcleo Milenio de Ingeniería Molecular para Catálisis y Biosensores (MECB)
| | - Alejandra E. Aros
- Núcleo Milenio de Ingeniería Molecular para Catálisis y Biosensores (MECB)
- ICM
- Chile
- Laboratorio de Genética y Patogénesis Bacteriana
- Facultad de Ciencias Biológicas
| | - Carolina Otero
- Center for Integrative Medicine and Innovative Science (CIMIS)
- Facultad de Medicina
- Universidad Andres Bello
- Santiago
- Chile
| | - Rubén Polanco
- Centro de Biotecnología Vegetal
- Facultad de Ciencias Biológicas
- Universidad Andres Bello
- Santiago
- Chile
| | - Manuel Gacitúa
- Center of Applied Ecology and Sustainability (CAPES)
- Universidad Adolfo Ibáñez
- Peñalolén
- Chile
| | - Ramiro Arratia-Pérez
- Center of Applied Nanosciences (CENAP)
- Universidad Andres Bello
- Santiago
- Chile
- Núcleo Milenio de Ingeniería Molecular para Catálisis y Biosensores (MECB)
| | - Juan A. Fuentes
- Laboratorio de Genética y Patogénesis Bacteriana
- Facultad de Ciencias Biológicas
- Universidad Andrés Bello
- Santiago
- Chile
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28
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Ma H, Yang Z, Cao H, Lei L, Chang L, Ma Y, Yang M, Yao X, Sun S, Lei Z. One bioprobe: a fluorescent and AIE-active macromolecule; two targets: nucleolus and mitochondria with long term tracking. J Mater Chem B 2017; 5:655-660. [DOI: 10.1039/c6tb02844f] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The novel macromolecule fluorescent probe TPPA–DBO was developed with highly specific nucleolus-targeting and long term cell tracking ability.
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29
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Amirbekyan K, Duchemin N, Benedetti E, Joseph R, Colon A, Markarian SA, Bethge L, Vonhoff S, Klussmann S, Cossy J, Vasseur JJ, Arseniyadis S, Smietana M. Design, Synthesis, and Binding Affinity Evaluation of Hoechst 33258 Derivatives for the Development of Sequence-Specific DNA-Based Asymmetric Catalysts. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00495] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Karen Amirbekyan
- Institut
des Biomolécules Max Mousseron, UMR 5247 CNRS, Université de Montpellier, ENSCM Place Eugène Bataillon, 34095 Montpellier, France
- Department
of Physical Chemistry, Yerevan State University, 1 Alex Manoogian, Yerevan 0025, Armenia
| | - Nicolas Duchemin
- Laboratoire
de Chimie Organique, Institute of Chemistry, Biology and Innovation
(CBI) - ESPCI ParisTech/CNRS (UMR8231)/PSL* Research University, 10 rue Vauquelin, 75231 CEDEX 05 Paris, France
| | - Erica Benedetti
- Laboratoire
de Chimie Organique, Institute of Chemistry, Biology and Innovation
(CBI) - ESPCI ParisTech/CNRS (UMR8231)/PSL* Research University, 10 rue Vauquelin, 75231 CEDEX 05 Paris, France
| | - Rinah Joseph
- Laboratoire
de Chimie Organique, Institute of Chemistry, Biology and Innovation
(CBI) - ESPCI ParisTech/CNRS (UMR8231)/PSL* Research University, 10 rue Vauquelin, 75231 CEDEX 05 Paris, France
| | - Aude Colon
- Laboratoire
de Chimie Organique, Institute of Chemistry, Biology and Innovation
(CBI) - ESPCI ParisTech/CNRS (UMR8231)/PSL* Research University, 10 rue Vauquelin, 75231 CEDEX 05 Paris, France
| | - Shiraz A. Markarian
- Department
of Physical Chemistry, Yerevan State University, 1 Alex Manoogian, Yerevan 0025, Armenia
| | - Lucas Bethge
- NOXXON Pharma AG, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Stephan Vonhoff
- NOXXON Pharma AG, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Sven Klussmann
- NOXXON Pharma AG, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Janine Cossy
- Laboratoire
de Chimie Organique, Institute of Chemistry, Biology and Innovation
(CBI) - ESPCI ParisTech/CNRS (UMR8231)/PSL* Research University, 10 rue Vauquelin, 75231 CEDEX 05 Paris, France
| | - Jean-Jacques Vasseur
- Institut
des Biomolécules Max Mousseron, UMR 5247 CNRS, Université de Montpellier, ENSCM Place Eugène Bataillon, 34095 Montpellier, France
| | - Stellios Arseniyadis
- Laboratoire
de Chimie Organique, Institute of Chemistry, Biology and Innovation
(CBI) - ESPCI ParisTech/CNRS (UMR8231)/PSL* Research University, 10 rue Vauquelin, 75231 CEDEX 05 Paris, France
- School
of Biological and Chemical Sciences, Queen Mary University of London, Joseph Priestley Building, Mile End Road, London E1 4NS, United Kingdom
| | - Michael Smietana
- Institut
des Biomolécules Max Mousseron, UMR 5247 CNRS, Université de Montpellier, ENSCM Place Eugène Bataillon, 34095 Montpellier, France
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30
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Patra A, Hazra S, Samanta N, Suresh Kumar G, Mitra RK. Micelle induced dissociation of DNA–ligand complexes: The effect of ligand binding specificity. Int J Biol Macromol 2016; 82:418-24. [DOI: 10.1016/j.ijbiomac.2015.11.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 10/19/2015] [Accepted: 11/05/2015] [Indexed: 11/16/2022]
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31
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Biancardi A, Biver T, Burgalassi A, Mattonai M, Secco F, Venturini M. Mechanistic aspects of thioflavin-T self-aggregation and DNA binding: evidence for dimer attack on DNA grooves. Phys Chem Chem Phys 2015; 16:20061-72. [PMID: 25130260 DOI: 10.1039/c4cp02838d] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Thioflavin-T (TFT) is a fluorescent marker widely employed in biomedical research but the mechanism of its binding to polynucleotides has been poorly understood. This paper presents a study of the mechanisms of TFT self-aggregation and binding to DNA. Relaxation kinetics of TFT solutions show that the cyanine undergoes dimerization followed by dimer isomerisation. The interaction of TFT with DNA has been investigated using static methods, such as spectrophotometric and spectrofluorometric titrations under different conditions (salt content, temperature), fluorescence quenching, viscometric experiments and the T-jump relaxation method. The combined use of these techniques enabled us to show that the TFT monomer undergoes intercalation between the DNA base pairs and external binding according to a branched mechanism. Moreover, it has also been observed that, under dye excess conditions, the TFT dimer binds to the DNA grooves. The molecular structures of intercalated TFT and the groove-bound TFT dimer are obtained by performing QM/MM MD simulations.
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Affiliation(s)
- A Biancardi
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, 56126 Pisa, Italy.
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32
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Lukinavičius G, Blaukopf C, Pershagen E, Schena A, Reymond L, Derivery E, Gonzalez-Gaitan M, D'Este E, Hell SW, Wolfram Gerlich D, Johnsson K. SiR-Hoechst is a far-red DNA stain for live-cell nanoscopy. Nat Commun 2015; 6:8497. [PMID: 26423723 PMCID: PMC4600740 DOI: 10.1038/ncomms9497] [Citation(s) in RCA: 187] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 08/27/2015] [Indexed: 12/20/2022] Open
Abstract
Cell-permeable DNA stains are popular markers in live-cell imaging. Currently used DNA stains for live-cell imaging are either toxic, require illumination with blue light or are not compatible with super-resolution microscopy, thereby limiting their utility. Here we describe a far-red DNA stain, SiR–Hoechst, which displays minimal toxicity, is applicable in different cell types and tissues, and is compatible with super-resolution microscopy. The combination of these properties makes this probe a powerful tool for live-cell imaging. Existing DNA stains for live cell microscopy are either toxic, require illumination with blue light, or are not compatible with super-resolution microscopy. Here the authors develop SiRHoechst, a non-toxic far-red DNA stain that is compatible with super-resolution microscopy.
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Affiliation(s)
- Gražvydas Lukinavičius
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering (ISIC), Institute of Bioengineering, NCCR in Chemical Biology, 1015 Lausanne, Switzerland
| | - Claudia Blaukopf
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna Biocenter Campus (VBC), Dr Bohr Gasse 3, 1030 Vienna, Austria
| | - Elias Pershagen
- Department of Chemistry-BMC, Uppsala University, 75123 Uppsala, Sweden
| | - Alberto Schena
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering (ISIC), Institute of Bioengineering, NCCR in Chemical Biology, 1015 Lausanne, Switzerland
| | - Luc Reymond
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering (ISIC), Institute of Bioengineering, NCCR in Chemical Biology, 1015 Lausanne, Switzerland
| | - Emmanuel Derivery
- Department of Biochemistry, NCCR in Chemical Biology, University of Geneva, 1211 Geneva, Switzerland
| | - Marcos Gonzalez-Gaitan
- Department of Biochemistry, NCCR in Chemical Biology, University of Geneva, 1211 Geneva, Switzerland
| | - Elisa D'Este
- Department NanoBiophotonics, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Stefan W Hell
- Department NanoBiophotonics, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Daniel Wolfram Gerlich
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna Biocenter Campus (VBC), Dr Bohr Gasse 3, 1030 Vienna, Austria
| | - Kai Johnsson
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering (ISIC), Institute of Bioengineering, NCCR in Chemical Biology, 1015 Lausanne, Switzerland
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33
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Narayanaswamy N, Das S, Samanta PK, Banu K, Sharma GP, Mondal N, Dhar SK, Pati SK, Govindaraju T. Sequence-specific recognition of DNA minor groove by an NIR-fluorescence switch-on probe and its potential applications. Nucleic Acids Res 2015; 43:8651-63. [PMID: 26350219 PMCID: PMC4605319 DOI: 10.1093/nar/gkv875] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 08/19/2015] [Indexed: 11/30/2022] Open
Abstract
In molecular biology, understanding the functional and structural aspects of DNA requires sequence-specific DNA binding probes. Especially, sequence-specific fluorescence probes offer the advantage of real-time monitoring of the conformational and structural reorganization of DNA in living cells. Herein, we designed a new class of D2A (one-donor-two-acceptor) near-infrared (NIR) fluorescence switch-on probe named quinone cyanine–dithiazole (QCy–DT) based on the distinctive internal charge transfer (ICT) process for minor groove recognition of AT-rich DNA. Interestingly, QCy–DT exhibited strong NIR-fluorescence enhancement in the presence of AT-rich DNA compared to GC-rich and single-stranded DNAs. We show sequence-specific minor groove recognition of QCy–DT for DNA containing 5′-AATT-3′ sequence over other variable (A/T)4 sequences and local nucleobase variation study around the 5′-X(AATT)Y-3′ recognition sequence revealed that X = A and Y = T are the most preferable nucleobases. The live cell imaging studies confirmed mammalian cell permeability, low-toxicity and selective staining capacity of nuclear DNA without requiring RNase treatment. Further, Plasmodium falciparum with an AT-rich genome showed specific uptake with a reasonably low IC50 value (<4 µM). The ease of synthesis, large Stokes shift, sequence-specific DNA minor groove recognition with switch-on NIR-fluorescence, photostability and parasite staining with low IC50 make QCy–DT a potential and commercially viable DNA probe.
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Affiliation(s)
- Nagarjun Narayanaswamy
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, India
| | - Shubhajit Das
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - Pralok K Samanta
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - Khadija Banu
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, India
| | | | - Neelima Mondal
- School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Suman K Dhar
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, India
| | - Swapan K Pati
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, Karnataka, India
| | - T Govindaraju
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, India
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34
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Koda H, Brazier JA, Onishi I, Sasaki S. Strong positive cooperativity in binding to the A3T3 repeat by Hoechst 33258 derivatives attaching the quinoline units at the end of a branched linker. Bioorg Med Chem 2015; 23:4583-4590. [DOI: 10.1016/j.bmc.2015.05.056] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 05/29/2015] [Accepted: 05/30/2015] [Indexed: 12/15/2022]
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35
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A label-free fluorescence turn-on sensor for rapid detection of cysteine. Talanta 2015; 138:144-148. [DOI: 10.1016/j.talanta.2015.02.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 02/02/2015] [Accepted: 02/04/2015] [Indexed: 11/18/2022]
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36
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Verma SD, Pal N, Singh MK, Sen S. Sequence-Dependent Solvation Dynamics of Minor-Groove Bound Ligand Inside Duplex-DNA. J Phys Chem B 2015; 119:11019-29. [DOI: 10.1021/acs.jpcb.5b01977] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Sachin Dev Verma
- Spectroscopy Laboratory,
School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Nibedita Pal
- Spectroscopy Laboratory,
School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Moirangthem Kiran Singh
- Spectroscopy Laboratory,
School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Sobhan Sen
- Spectroscopy Laboratory,
School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
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37
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Nakamura A, Takigawa K, Kurishita Y, Kuwata K, Ishida M, Shimoda Y, Hamachi I, Tsukiji S. Hoechst tagging: a modular strategy to design synthetic fluorescent probes for live-cell nucleus imaging. Chem Commun (Camb) 2015; 50:6149-52. [PMID: 24776726 DOI: 10.1039/c4cc01753f] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We report a general strategy to create small-molecule fluorescent probes for the nucleus in living cells. Our strategy is based on the attachment of the DNA-binding Hoechst compound to a fluorophore of interest. Using this approach, simple fluorescein, BODIPY, and rhodamine dyes were readily converted to novel turn-on fluorescent nucleus-imaging probes.
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Affiliation(s)
- Akinobu Nakamura
- Department of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan.
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38
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Zhang Y, Hu PC, Cai P, Yang F, Cheng GZ. Synthesis, characterization, crystal structure, cytotoxicity, apoptosis and cell cycle arrest of ruthenium(ii) complex [Ru(bpy)2(adpa)](PF6)2 (bpy = 2,2′-bipyridine, adpa = 4-(4-aminophenyl)diazenyl-N-(pyridin-2-ylmethylene)aniline). RSC Adv 2015. [DOI: 10.1039/c4ra12715c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new ruthenium complex (Ru-adpa) characterized by single X-ray diffraction exhibits excellent cytotoxicity against AGS cells.
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Affiliation(s)
- Yan Zhang
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
| | - Peng-Chao Hu
- School of Basic Medicine
- Wuhan University
- Wuhan
- China
| | - Ping Cai
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
| | - Fang Yang
- School of Basic Medicine
- Wuhan University
- Wuhan
- China
| | - Gong-Zhen Cheng
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
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39
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Sakamoto T, Hasegawa D, Fujimoto K. Fluorine-modified bisbenzimide derivative as a molecular probe for bimodal and simultaneous detection of DNAs by 19F NMR and fluorescence. Chem Commun (Camb) 2015; 51:8749-52. [DOI: 10.1039/c5cc01995h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A molecular probe that can detect DNA with 19F NMR/fluorescence bimodal manner was developed. The probe can discriminate and detect simultaneously DNA sequences around AATT binding site by 19F NMR.
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Affiliation(s)
- Takashi Sakamoto
- School of Materials Science
- Japan Advanced Institute of Science and Technology
- Nomi
- Japan
| | - Daisaku Hasegawa
- School of Materials Science
- Japan Advanced Institute of Science and Technology
- Nomi
- Japan
| | - Kenzo Fujimoto
- School of Materials Science
- Japan Advanced Institute of Science and Technology
- Nomi
- Japan
- Research Center for Bio-Architecture
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40
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Wang X, Zhu L, Hou X, Wang L, Yin S. Polyethylenimine mediated magnetic nanoparticles for combined intracellular imaging, siRNA delivery and anti-tumor therapy. RSC Adv 2015. [DOI: 10.1039/c5ra18464a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
PEI–magnetic γ-Fe2O3nanoparticles (MNPs) were modified with fluorescent FITC for intracellular imaging and were also used for survivin siRNA delivery. The results suggested that the fabricated PEI–MNPs are a promising nanovehicle for efficient anti-tumor therapy.
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Affiliation(s)
- Xueqin Wang
- College of Bioengineering
- Henan University of Technology
- Zhengzhou
- P. R. China
| | - Liang Zhu
- College of Bioengineering
- Henan University of Technology
- Zhengzhou
- P. R. China
| | - Xuandi Hou
- College of Bioengineering
- Henan University of Technology
- Zhengzhou
- P. R. China
| | - Liang Wang
- College of Bioengineering
- Henan University of Technology
- Zhengzhou
- P. R. China
| | - Shijiao Yin
- College of Bioengineering
- Henan University of Technology
- Zhengzhou
- P. R. China
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41
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Wang X, Zhang H, Jing H, Cui L. Highly Efficient Labeling of Human Lung Cancer Cells Using Cationic Poly-l-lysine-Assisted Magnetic Iron Oxide Nanoparticles. NANO-MICRO LETTERS 2015; 7:374-384. [PMID: 30464985 PMCID: PMC6223914 DOI: 10.1007/s40820-015-0053-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Accepted: 06/23/2015] [Indexed: 05/18/2023]
Abstract
Cell labeling with magnetic iron oxide nanoparticles (IONPs) is increasingly a routine approach in the cell-based cancer treatment. However, cell labeling with magnetic IONPs and their leading effects on the biological properties of human lung carcinoma cells remain scarcely reported. Therefore, in the present study the magnetic γ-Fe2O3 nanoparticles (MNPs) were firstly synthesized and surface-modified with cationic poly-l-lysine (PLL) to construct the PLL-MNPs, which were then used to magnetically label human A549 lung cancer cells. Cell viability and proliferation were evaluated with propidium iodide/fluorescein diacetate double staining and standard 3-(4,5-dimethylthiazol-2-diphenyl-tetrazolium) bromide assay, and the cytoskeleton was immunocytochemically stained. The cell cycle of the PLL-MNP-labeled A549 lung cancer cells was analyzed using flow cytometry. Apoptotic cells were fluorescently analyzed with nuclear-specific staining after the PLL-MNP labeling. The results showed that the constructed PLL-MNPs efficiently magnetically labeled A549 lung cancer cells and that, at low concentrations, labeling did not affect cellular viability, proliferation capability, cell cycle, and apoptosis. Furthermore, the cytoskeleton in the treated cells was detected intact in comparison with the untreated counterparts. However, the results also showed that at high concentration (400 µg mL-1), the PLL-MNPs would slightly impair cell viability, proliferation, cell cycle, and apoptosis and disrupt the cytoskeleton in the treated A549 lung cancer cells. Therefore, the present results indicated that the PLL-MNPs at adequate concentrations can be efficiently used for labeling A549 lung cancer cells and could be considered as a feasible approach for magnetic targeted anti-cancer drug/gene delivery, targeted diagnosis, and therapy in lung cancer treatment.
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Affiliation(s)
- Xueqin Wang
- College of Bioengineering, Henan University of Technology, Zhengzhou, 450001 Henan People’s Republic of China
| | - Huiru Zhang
- College of Bioengineering, Henan University of Technology, Zhengzhou, 450001 Henan People’s Republic of China
| | - Hongjuan Jing
- College of Bioengineering, Henan University of Technology, Zhengzhou, 450001 Henan People’s Republic of China
| | - Liuqing Cui
- College of Bioengineering, Henan University of Technology, Zhengzhou, 450001 Henan People’s Republic of China
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42
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Wang X, Wang L, Tan X, Zhang H, Sun G. Construction of doxorubicin-loading magnetic nanocarriers for assaying apoptosis of glioblastoma cells. J Colloid Interface Sci 2014; 436:267-75. [DOI: 10.1016/j.jcis.2014.09.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 09/01/2014] [Accepted: 09/02/2014] [Indexed: 12/12/2022]
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43
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Jia T, Wang J, Guo P, Yu J. Characterizations of cationic γ-carbolines binding with double-stranded DNA by spectroscopic methods and AFM imaging. Org Biomol Chem 2014; 13:1234-42. [PMID: 25434722 DOI: 10.1039/c4ob01905a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Two cationic γ-carbolines, 2-methyl-5H-pyrido[4,3-b]indolium iodide (MPII) and 2,5-dimethyl-5H-pyrido[4,3-b]indolium iodide (DPII), were synthesized, and the DNA-binding properties of the cationic γ-carbolines were elucidated. Through a series of experiments, we proved that the two cationic γ-carbolines could strongly interact with DNA by intercalative binding. However, DPII, with a methyl group substituting H atom of 5-NH, has shown a stronger intercalative interaction with DNA compared to MPII. The dissociation of H from the 5-NH of MPII resulted in better water solubility and less binding affinity to DNA. Atomic force microscopy (AFM) images of pBR322 showed that both MPII and DPII strongly interacted with DNA and induced conformational changes in DNA. Moreover, the CT-DNA circular dichroism (CD) spectra changes and the statistics of the node numbers of pBR322 in AFM images indicated that MPII had more profound effects on DNA conformations compared to DPII. Furthermore, our studies have shown that the interactions between cationic γ-carbolines and DNA were sensitive to ionic strength. Increased ionic strength in the buffer caused the DNA helix to shrink, and the base stacking would be more compact, which resulted in minimal intercalation of cationic γ-carbolines into DNA.
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Affiliation(s)
- Tao Jia
- School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei 430072, PR China.
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44
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Bordello J, Sánchez MI, Vázquez ME, Mascareñas JL, Al-Soufi W, Novo M. Fluorescence-labeled bis-benzamidines as fluorogenic DNA minor-groove binders: photophysics and binding dynamics. Chemistry 2014; 21:1609-19. [PMID: 25418429 DOI: 10.1002/chem.201404926] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Indexed: 01/19/2023]
Abstract
In recent decades there has been great interest in the design of highly sensitive sequence-specific DNA binders. The eligibility of the binder depends on the magnitude of the fluorescence increase upon binding, related to its photophysics, and on its affinity and specificity, which is, in turn, determined by the dynamics of the binding process. Therefore, progress in the design of DNA binders requires both thorough photophysical studies and precise determination of the association and dissociation rate constants involved. We have studied two bis-benzamidine (BBA) derivatives labeled by linkers of various lengths with the dye Oregon Green (OG). These fluorogenic binders show a dramatic fluorescence enhancement upon binding to the minor groove of double-stranded (ds) DNA, as well as significant improvement in their sequence specificity versus the parent BBA, although with decreased affinity constants. Detailed photophysical analysis shows that static and dynamic quenching of the OG fluorescence by BBA through photoinduced electron transfer is suppressed upon insertion of BBA into the minor groove of DNA. Fluorescence correlation spectroscopy yields precise dynamic rate constants that prove that the association process of these fluorogenic binders to dsDNA is very similar to that of BBA alone and that their lower affinity is mainly a consequence of their weaker attachment to the minor groove and the resultant faster dissociation process. The conclusions of this study will allow us to go one step further in the design of new DNA binders with tunable fluorescence and binding properties.
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Affiliation(s)
- Jorge Bordello
- Department of Physical Chemistry, Faculty of Science, Campus Lugo, University of Santiago de Compostela, 27002 Lugo (Spain), Fax: (+34) 982824001
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45
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Preet R, Chakraborty B, Siddharth S, Mohapatra P, Das D, Satapathy SR, Das S, Maiti NC, Maulik PR, Kundu CN, Chowdhury C. Synthesis and biological evaluation of andrographolide analogues as anti-cancer agents. Eur J Med Chem 2014; 85:95-106. [DOI: 10.1016/j.ejmech.2014.07.088] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 07/23/2014] [Accepted: 07/24/2014] [Indexed: 12/13/2022]
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46
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Vargiu AV, Magistrato A. Atomistic-Level Portrayal of Drug-DNA Interplay: A History of Courtships and Meetings Revealed by Molecular Simulations. ChemMedChem 2014; 9:1966-81. [DOI: 10.1002/cmdc.201402203] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Indexed: 12/19/2022]
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47
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Ahmad H, Wragg A, Cullen W, Wombwell C, Meijer AJHM, Thomas JA. From Intercalation to Groove Binding: Switching the DNA-Binding Mode of Isostructural Transition-Metal Complexes. Chemistry 2014; 20:3089-96. [DOI: 10.1002/chem.201304053] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 12/10/2013] [Indexed: 11/06/2022]
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48
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Fornander LH, Wu L, Billeter M, Lincoln P, Nordén B. Minor-Groove Binding Drugs: Where Is the Second Hoechst 33258 Molecule? J Phys Chem B 2013; 117:5820-30. [DOI: 10.1021/jp400418w] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Louise H. Fornander
- Department of Chemical and Biological
Engineering, Chalmers University of Technology, S-41296 Gothenburg, Sweden
| | - Lisha Wu
- Department of Chemical and Biological
Engineering, Chalmers University of Technology, S-41296 Gothenburg, Sweden
| | - Martin Billeter
- Department of Chemistry and
Molecular Biology, University of Gothenburg, SE-40530 Gothenburg, Sweden
| | - Per Lincoln
- Department of Chemical and Biological
Engineering, Chalmers University of Technology, S-41296 Gothenburg, Sweden
| | - Bengt Nordén
- Department of Chemical and Biological
Engineering, Chalmers University of Technology, S-41296 Gothenburg, Sweden
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Jia T, Xiang J, Wang J, Guo P, Yu J. Interactions of newly designed dicationic carbazole derivatives with double-stranded DNA: syntheses, binding studies and AFM imaging. Org Biomol Chem 2013; 11:5512-20. [DOI: 10.1039/c3ob40799c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lisitsyna ES, Durandin NA, Ivanov AA, Streltsov SA, Susova OY, Shtil AA, Zhuze AL, Kuzmin VA. Characteristics of complex formation between monomeric and dimeric bisbenzimidazoles and AT-containing polynucleotide. Mol Biol 2012. [DOI: 10.1134/s0026893312060131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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