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Makhaeva GF, Kovaleva NV, Rudakova EV, Boltneva NP, Lushchekina SV, Astakhova TY, Timokhina EN, Serebryakova OG, Shchepochkin AV, Averkov MA, Utepova IA, Demina NS, Radchenko EV, Palyulin VA, Fisenko VP, Bachurin SO, Chupakhin ON, Charushin VN, Richardson RJ. Derivatives of 9-phosphorylated acridine as butyrylcholinesterase inhibitors with antioxidant activity and the ability to inhibit β-amyloid self-aggregation: potential therapeutic agents for Alzheimer's disease. Front Pharmacol 2023; 14:1219980. [PMID: 37654616 PMCID: PMC10466253 DOI: 10.3389/fphar.2023.1219980] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 07/18/2023] [Indexed: 09/02/2023] Open
Abstract
We investigated the inhibitory activities of novel 9-phosphoryl-9,10-dihydroacridines and 9-phosphorylacridines against acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and carboxylesterase (CES). We also studied the abilities of the new compounds to interfere with the self-aggregation of β-amyloid (Aβ42) in the thioflavin test as well as their antioxidant activities in the ABTS and FRAP assays. We used molecular docking, molecular dynamics simulations, and quantum-chemical calculations to explain experimental results. All new compounds weakly inhibited AChE and off-target CES. Dihydroacridines with aryl substituents in the phosphoryl moiety inhibited BChE; the most active were the dibenzyloxy derivative 1d and its diphenethyl bioisostere 1e (IC50 = 2.90 ± 0.23 µM and 3.22 ± 0.25 µM, respectively). Only one acridine, 2d, an analog of dihydroacridine, 1d, was an effective BChE inhibitor (IC50 = 6.90 ± 0.55 μM), consistent with docking results. Dihydroacridines inhibited Aβ42 self-aggregation; 1d and 1e were the most active (58.9% ± 4.7% and 46.9% ± 4.2%, respectively). All dihydroacridines 1 demonstrated high ABTS•+-scavenging and iron-reducing activities comparable to Trolox, but acridines 2 were almost inactive. Observed features were well explained by quantum-chemical calculations. ADMET parameters calculated for all compounds predicted favorable intestinal absorption, good blood-brain barrier permeability, and low cardiac toxicity. Overall, the best results were obtained for two dihydroacridine derivatives 1d and 1e with dibenzyloxy and diphenethyl substituents in the phosphoryl moiety. These compounds displayed high inhibition of BChE activity and Aβ42 self-aggregation, high antioxidant activity, and favorable predicted ADMET profiles. Therefore, we consider 1d and 1e as lead compounds for further in-depth studies as potential anti-AD preparations.
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Affiliation(s)
- Galina F. Makhaeva
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
| | - Nadezhda V. Kovaleva
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
| | - Elena V. Rudakova
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
| | - Natalia P. Boltneva
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
| | - Sofya V. Lushchekina
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
- Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Tatiana Yu Astakhova
- Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Elena N. Timokhina
- Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Olga G. Serebryakova
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
| | - Alexander V. Shchepochkin
- Institute of Organic Synthesis, Russian Academy of Sciences, Yekaterinburg, Russia
- Department of Organic and Biomolecular Chemistry, Ural Federal University, Yekaterinburg, Russia
| | - Maxim A. Averkov
- Institute of Organic Synthesis, Russian Academy of Sciences, Yekaterinburg, Russia
- Department of Organic and Biomolecular Chemistry, Ural Federal University, Yekaterinburg, Russia
| | - Irina A. Utepova
- Institute of Organic Synthesis, Russian Academy of Sciences, Yekaterinburg, Russia
- Department of Organic and Biomolecular Chemistry, Ural Federal University, Yekaterinburg, Russia
| | - Nadezhda S. Demina
- Institute of Organic Synthesis, Russian Academy of Sciences, Yekaterinburg, Russia
| | - Eugene V. Radchenko
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
| | - Vladimir A. Palyulin
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
| | - Vladimir P. Fisenko
- Department of Pharmacology of the Institute of Biodesign and Complex System Modeling of Biomedical Science & Technology Park of Sechenov I.M., First Moscow State Medical University, Moscow, Russia
| | - Sergey O. Bachurin
- Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
| | - Oleg N. Chupakhin
- Institute of Organic Synthesis, Russian Academy of Sciences, Yekaterinburg, Russia
- Department of Organic and Biomolecular Chemistry, Ural Federal University, Yekaterinburg, Russia
| | - Valery N. Charushin
- Institute of Organic Synthesis, Russian Academy of Sciences, Yekaterinburg, Russia
- Department of Organic and Biomolecular Chemistry, Ural Federal University, Yekaterinburg, Russia
| | - Rudy J. Richardson
- Department of Pharmacology of the Institute of Biodesign and Complex System Modeling of Biomedical Science & Technology Park of Sechenov I.M., First Moscow State Medical University, Moscow, Russia
- Department of Environmental Health Sciences, University of Michigan, Ann Arbor, MI, United States
- Department of Neurology, University of Michigan, Ann Arbor, MI, United States
- Center of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, United States
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Paul A, Farahat AA, Boykin DW, Wilson WD. Thermodynamic Factors That Drive Sequence-Specific DNA Binding of Designed, Synthetic Minor Groove Binding Agents. Life (Basel) 2022; 12:life12050681. [PMID: 35629349 PMCID: PMC9147024 DOI: 10.3390/life12050681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/29/2022] [Accepted: 04/29/2022] [Indexed: 11/16/2022] Open
Abstract
Ken Breslauer began studies on the thermodynamics of small cationic molecules binding in the DNA minor groove over 30 years ago, and the studies reported here are an extension of those ground-breaking reports. The goals of this report are to develop a detailed understanding of the binding thermodynamics of pyridine-based sequence-specific minor groove binders that have different terminal cationic groups. We apply biosensor-surface plasmon resonance and ITC methods to extend the understanding of minor groove binders in two directions: (i) by using designed, heterocyclic dicationic minor groove binders that can incorporate a G•C base pair (bp), with flanking AT base pairs, into their DNA recognition site, and bind to DNA sequences specifically; and (ii) by using a range of flanking AT sequences to better define molecular recognition of the minor groove. A G•C bp in the DNA recognition site causes a generally more negative binding enthalpy than with most previously used pure AT binding sites. The binding is enthalpy-driven at 25 °C and above. The flanking AT sequences also have a large effect on the binding energetics with the -AAAGTTT- site having the strongest affinity. As a result of these studies, we now have a much better understanding of the effects of the DNA sequence and compound structure on the molecular recognition and thermodynamics of minor groove complexes.
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Affiliation(s)
- Ananya Paul
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA; (A.P.); (A.A.F.); (D.W.B.)
| | - Abdelbasset A. Farahat
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA; (A.P.); (A.A.F.); (D.W.B.)
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - David W. Boykin
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA; (A.P.); (A.A.F.); (D.W.B.)
| | - W. David Wilson
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA 30303, USA; (A.P.); (A.A.F.); (D.W.B.)
- Correspondence: ; Tel.: +1-404-413-5503; Fax: +1-404-413-5505
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3
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Solis-Egaña F, Lavín-Urqueta N, Guerra Díaz D, Mariño-Ocampo N, Faúndez MA, Fuentealba D. Supramolecular co-encapsulation of a photosensitizer and chemotherapeutic drug in cucurbit[8]uril for potential chemophototherapy. Photochem Photobiol Sci 2022; 21:349-359. [PMID: 35088367 DOI: 10.1007/s43630-022-00174-7] [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: 11/16/2021] [Accepted: 01/14/2022] [Indexed: 11/25/2022]
Abstract
Supramolecular strategies as well as combinatorial approaches have been proposed to improve cancer therapeutics. In this work, we investigated the encapsulation of the photosensitizer acridine orange (AO) and the chemotherapeutic drug oxaliplatin (OxPt) in cucurbit[8]uril (CB[8]), and tested their effect both separate and combined on tumoral cells cultivated in vitro. Binding constants and enthalpies of reaction for the AO@CB[8], (AO)2@CB[8] and OxPt@CB[8] complexes were determined by isothermal titration calorimetry. In the case of AO, a negative cooperativity for the binding of the second AO molecule was found, in agreement with previous fluorescence titration data. We show herein that the AO@CB[8] complex was effectively incorporated within the cells and showed important phototoxicity, while the OxPt@CB[8] complex was cytotoxic only at long incubation times (24 h). Pre-treatment of the cells with the OxPt@CB[8] complex for 24 h inhibited any photodynamic action by the later treatment with the AO@CB[8] complex. However, when both complexes were co-incubated for 90 min, the combined cytotoxicity/phototoxicity was superior to any of the treatments individually. A cooperative effect was identified that added up to an extra 30% cytotoxicity/phototoxicity. The results point to an interesting system where a photosensitizer and chemotherapeutic drug are co-encapsulated in a macrocycle to develop chemophototherapy applications.
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Affiliation(s)
- Fresia Solis-Egaña
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Nicole Lavín-Urqueta
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Daniel Guerra Díaz
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Nory Mariño-Ocampo
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Mario A Faúndez
- Escuela de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Denis Fuentealba
- Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Escuela de Química, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile.
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Robinson-Duggon J, McTiernan CD, Muñoz M, Guerra D, Escobar Álvarez E, Andrade-Villalobos F, Fierro A, Edwards AM, Alarcon EI, Fuentealba D. Biosupramolecular complexes of amphiphilic photosensitizers with human serum albumin and cucurbit[7]uril as carriers for photodynamic therapy. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2021; 223:112284. [PMID: 34450362 DOI: 10.1016/j.jphotobiol.2021.112284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 07/21/2021] [Accepted: 08/09/2021] [Indexed: 01/17/2023]
Abstract
In the present work, we evaluated the supramolecular interactions between three photosensitizers, namely toluidine blue O (TBO, positively charged) and two fatty acid conjugates of 6 and 14 carbon atoms chain lengths (TBOC6 and TBOC14), with human serum albumin (HSA) and the macrocycle cucurbit[7]uril (CB[7]), alone or in combination within a biosupramolecular system as potential carriers of photosensitizers for Photodynamic therapy (PDT). Binding studies were carried out using photophysical and calorimetric techniques and accompanied with molecular docking simulations. Amphiphilic photosensitizers, particularly TBOC14, showed stronger binding to HSA and (CB[7]). Comparing the different delivery systems, (CB[7]) had a marginal effect on cell uptake and phototoxicity in HeLa cells, while HSA showed enhanced cell uptake with phototoxicities that depended on the photosensitizer. Despite low cell uptake, the combination of both (CB[7]) and HSA was the most phototoxic, which illustrates the potential of combining these systems for PDT applications.
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Affiliation(s)
- José Robinson-Duggon
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile; Departamento de Bioquímica, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panamá 0824, Panamá.
| | - Christopher D McTiernan
- BEaTS Research Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, ON K1Y4W7, Canada
| | - Marcelo Muñoz
- BEaTS Research Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, ON K1Y4W7, Canada
| | - Daniel Guerra
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Elizabeth Escobar Álvarez
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Felipe Andrade-Villalobos
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile; Departamento de Química Orgánica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Angélica Fierro
- Departamento de Química Orgánica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Ana María Edwards
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Emilio I Alarcon
- BEaTS Research Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, ON K1Y4W7, Canada; Department of Biochemistry, Microbiology, and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Denis Fuentealba
- Laboratorio de Química Biosupramolecular, Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile.
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5
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Naphthalimide-based macrophage nucleus imaging probes. Eur J Med Chem 2020; 200:112407. [DOI: 10.1016/j.ejmech.2020.112407] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 04/07/2020] [Accepted: 04/27/2020] [Indexed: 11/21/2022]
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6
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Stulz A, Breitsamer M, Winter G, Heerklotz H. Primary and Secondary Binding of Exenatide to Liposomes. Biophys J 2020; 118:600-611. [PMID: 31972156 PMCID: PMC7002983 DOI: 10.1016/j.bpj.2019.12.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 12/17/2019] [Accepted: 12/23/2019] [Indexed: 12/29/2022] Open
Abstract
The interactions of exenatide, a Trp-containing peptide used as a drug to treat diabetes, with liposomes were studied by isothermal titration calorimetry (ITC), tryptophan (Trp) fluorescence, and microscale thermophoresis measurements. The results are not only important for better understanding the release of this specific drug from vesicular phospholipid gel formulations but describe a general scenario as described before for various systems. This study introduces a model to fit these data on the basis of primary and secondary peptide-lipid interactions. Finally, resolving apparent inconsistencies between different methods aids the design and critical interpretation of binding experiments in general. Our results show that the net cationic exenatide adsorbs electrostatically to liposomes containing anionic diacyl phosphatidylglycerol lipids (PG); however, the ITC data could not properly be fitted by any established model. The combination of electrostatic adsorption of exenatide to the membrane surface and its self-association (Kd = 46 μM) suggested the possibility of secondary binding of peptide to the first, primarily (i.e., lipid-) bound peptide layer. A global fit of the ITC data validated this model and suggested one peptide to bind primarily per five PG molecules with a Kd ≈ 0.2 μM for PC/PG 1:1 and 0.6 μM for PC/PG 7:3 liposomes. Secondary binding shows a weaker affinity and a less exothermic or even endothermic enthalpy change. Depending on the concentration of liposomes, secondary binding may also lead to liposomal aggregation as detected by dynamic light-scattering measurements. ITC quantifies primary and secondary binding separately, whereas microscale thermophoresis and Trp fluorescence represent a summary or average of both effects, possibly with the fluorescence data showing somewhat greater weighting of primary binding. Systems with secondary peptide-peptide association within the membrane are mathematically analogous to the adsorption discussed here.
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Affiliation(s)
- Anja Stulz
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-Universität, Freiburg, Germany
| | - Michaela Breitsamer
- Pharmaceutical Technology and Biopharmaceutics, Department of Pharmacy, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Gerhard Winter
- Pharmaceutical Technology and Biopharmaceutics, Department of Pharmacy, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Heiko Heerklotz
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-Universität, Freiburg, Germany; Signalling Research Centres BIOSS and CIBSS, Freiburg, Germany; Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada.
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7
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Syamala PPN, Soberats B, Görl D, Gekle S, Würthner F. Thermodynamic insights into the entropically driven self-assembly of amphiphilic dyes in water. Chem Sci 2019; 10:9358-9366. [PMID: 32110300 PMCID: PMC7017873 DOI: 10.1039/c9sc03103k] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Accepted: 08/19/2019] [Indexed: 01/04/2023] Open
Abstract
Self-assembly of amphiphilic dyes and π-systems are more difficult to understand and to control in water compared to organic solvents due to the hydrophobic effect. Herein, we elucidate in detail the self-assembly of a series of archetype bolaamphiphiles bearing a naphthalene bisimide (NBI) π-core with appended oligoethylene glycol (OEG) dendrons of different size. By utilizing temperature-dependent UV-vis spectroscopy and isothermal titration calorimetry (ITC), we have dissected the enthalpic and entropic parameters pertaining to the molecules' self-assembly. All investigated compounds show an enthalpically disfavored aggregation process leading to aggregate growth and eventually precipitation at elevated temperature, which is attributed to the dehydration of oligoethylene glycol units and their concomitant conformational changes. Back-folded conformation of the side chains plays a major role, as revealed by molecular dynamics (MD) and two dimensional NMR (2D NMR) studies, in directing the association. The sterical effect imparted by the jacketing of monomers and dimers also changes the aggregation mechanism from isodesmic to weakly anti-cooperative.
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Affiliation(s)
- Pradeep P N Syamala
- Universität Würzburg , Institut für Organische Chemie , Am Hubland , 97074 Würzburg , Germany .
- Center for Nanosystems Chemistry & Bavarian Polymer Institute (BPI) , Universität Würzburg , Theodor-Boveri-Weg , 97074 Würzburg , Germany
| | - Bartolome Soberats
- Center for Nanosystems Chemistry & Bavarian Polymer Institute (BPI) , Universität Würzburg , Theodor-Boveri-Weg , 97074 Würzburg , Germany
| | - Daniel Görl
- Center for Nanosystems Chemistry & Bavarian Polymer Institute (BPI) , Universität Würzburg , Theodor-Boveri-Weg , 97074 Würzburg , Germany
| | - Stephan Gekle
- Universität Bayreuth , Biofluid Simulation and Modeling, Theoretische Physik VI & Bavarian Polymer Institute (BPI) , 95440 Bayreuth , Germany .
| | - Frank Würthner
- Universität Würzburg , Institut für Organische Chemie , Am Hubland , 97074 Würzburg , Germany .
- Center for Nanosystems Chemistry & Bavarian Polymer Institute (BPI) , Universität Würzburg , Theodor-Boveri-Weg , 97074 Würzburg , Germany
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8
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Buchelnikov AS, Evstigneev VP, Evstigneev MP. Hetero-association models of non-covalent molecular complexation. Phys Chem Chem Phys 2019; 21:7717-7731. [PMID: 30931443 DOI: 10.1039/c8cp03183e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The present review discusses the current state-of-the-art in building models enabling the description of non-covalent equilibrium complexation of different types of molecules in solution, which results in the formation of supramolecular structures different in length and composition (hetero-association or supramolecular multicomponent co-polymerisation). The description is focused on standard physical and chemical quantities such as experimental observables and equilibrium parameters of interaction (equilibrium constants and concentrations). The major partial cases of the hetero-association models, such as finite and indefinite isodesmic and cooperative complexations, and Benesi-Hildebrand and Langmuir adsorption models are considered. Future challenges in the development of the hetero-association models are provided.
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9
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Saeed IQ, Buurma NJ. Analysis of Isothermal Titration Calorimetry Data for Complex Interactions Using I2CITC. Methods Mol Biol 2019; 1964:169-183. [PMID: 30929243 DOI: 10.1007/978-1-4939-9179-2_13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
I2CITC allows the analysis of isothermal titration calorimetry (ITC) data for complex coupled equilibria. Here we describe how, using I2CITC, ITC data for systems involving a self-aggregating ligand and a host offering one or two binding sites can be analyzed, how interaction models can be tested, and how confidence intervals for the optimized parameters can be determined.
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Affiliation(s)
- Ibrahim Q Saeed
- Department of Chemistry, College of Science, Salahaddin University, Erbil, Kurdistan Region, Iraq
| | - Niklaas J Buurma
- Physical Organic Chemistry Centre, School of Chemistry, Cardiff University, Cardiff, UK.
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10
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Affiliation(s)
- Hasan Y. Alniss
- Department of Medicinal Chemistry, College of Pharmacy, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
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11
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Mårtensson AKF, Lincoln P. Competitive DNA binding of Ru(bpy) 2dppz 2+ enantiomers studied with isothermal titration calorimetry (ITC) using a direct and general binding isotherm algorithm. Phys Chem Chem Phys 2018; 20:7920-7930. [PMID: 29308462 DOI: 10.1039/c7cp03184j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While isothermal titration calorimetry (ITC) is widely used and sometimes referred to as the "gold standard" for quantitative measurements of biomolecular interactions, its usage has so far been limited to the analysis of the binding to isolated, non-cooperative binding sites. Studies on more complicated systems, where the binding sites interact, causing either cooperativity or anti-cooperativity between neighboring bound ligands, are rare, probably due to the complexity of the methods currently available. Here we have developed a simple algorithm not limited by the complexity of a binding system, meaning that it can be implemented by anyone, from analyzing systems of simple, isolated binding sites to complicated interactive multiple-site systems. We demonstrate here that even complicated competitive binding calorimetric isotherms can be properly analyzed, provided that ligand-ligand interactions are taken into account. As a practical example, the competitive binding interactions between the two enantiomers of Ru(bpy)2dppz2+ (Ru-bpy) and poly(dAdT)2 (AT-DNA) are analyzed using our new algorithm, which provided an excellent global fit for the ITC experimental data.
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Affiliation(s)
- Anna K F Mårtensson
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-41296 Gothenburg, Sweden.
| | - Per Lincoln
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-41296 Gothenburg, Sweden.
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12
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Saeed HK, Jarman PJ, Archer S, Sreedharan S, Saeed IQ, Mckenzie LK, Weinstein JA, Buurma NJ, Smythe CGW, Thomas JA. Homo‐ and Heteroleptic Phototoxic Dinuclear Metallo‐Intercalators Based on Ru
II
(dppn) Intercalating Moieties: Synthesis, Optical, and Biological Studies. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707350] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Hiwa K. Saeed
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
| | - Paul J. Jarman
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
| | - Stuart Archer
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
| | | | - Ibrahim Q. Saeed
- Physical Organic Chemistry Centre School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT UK
| | - Luke K. Mckenzie
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
| | | | - Niklaas J. Buurma
- Physical Organic Chemistry Centre School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT UK
| | - Carl G. W. Smythe
- Department of Biomedical Science University of Sheffield Sheffield S10 2TN UK
| | - Jim A. Thomas
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
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13
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Saeed HK, Jarman PJ, Archer S, Sreedharan S, Saeed IQ, Mckenzie LK, Weinstein JA, Buurma NJ, Smythe CGW, Thomas JA. Homo‐ and Heteroleptic Phototoxic Dinuclear Metallo‐Intercalators Based on Ru
II
(dppn) Intercalating Moieties: Synthesis, Optical, and Biological Studies. Angew Chem Int Ed Engl 2017; 56:12628-12633. [DOI: 10.1002/anie.201707350] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Hiwa K. Saeed
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
| | - Paul J. Jarman
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
| | - Stuart Archer
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
| | | | - Ibrahim Q. Saeed
- Physical Organic Chemistry Centre School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT UK
| | - Luke K. Mckenzie
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
| | | | - Niklaas J. Buurma
- Physical Organic Chemistry Centre School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT UK
| | - Carl G. W. Smythe
- Department of Biomedical Science University of Sheffield Sheffield S10 2TN UK
| | - Jim A. Thomas
- Department of Chemistry University of Sheffield Sheffield S3 7HF UK
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14
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Saeed HK, Saeed IQ, Buurma NJ, Thomas JA. The Structure of Linkers Affects the DNA Binding Properties of Tethered Dinuclear Ruthenium(II) Metallo-Intercalators. Chemistry 2017; 23:5467-5477. [PMID: 28072487 DOI: 10.1002/chem.201605750] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Indexed: 12/12/2022]
Abstract
With the long-term aim of enhancing the binding properties of dinuclear RuII -based DNA light-switch complexes, a series of eight structurally related mono- and dinuclear systems are reported in which the linker of the bridging ligand has been modulated. These tethered systems have been designed to explore issues of steric demand at the binding site and the thermodynamic cost of entropy loss upon binding. Detailed spectroscopic and isothermal titration calorimetry (ITC) studies on the new complexes reveal that one of the linkers produces a dinuclear system that binds to duplex DNA with an affinity (Kb >107 m-1 ) that is higher than its corresponding monometallic complex and is the highest affinity for a non-threading bis-intercalating metal complex. These studies confirm that the tether has a major effect on the binding properties of dinuclear complexes containing intercalating units and establishes key design rules for the construction of dinuclear complexes with enhanced DNA binding characteristics.
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Affiliation(s)
- Hiwa K Saeed
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
| | - Ibrahim Q Saeed
- Physical Organic Chemistry Centre, School of Chemistry, Cardiff University, Main Building Park Place, Cardiff, CF10 3AT, UK
| | - Niklaas J Buurma
- Physical Organic Chemistry Centre, School of Chemistry, Cardiff University, Main Building Park Place, Cardiff, CF10 3AT, UK
| | - Jim A Thomas
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
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15
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Tripathi M, Khilari R, Thakur Y, Verma B, Pardhi M, Pande R. Oxovanadium complex as potential nucleic acid binder. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2017. [DOI: 10.1080/10601325.2017.1261620] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Mamta Tripathi
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India
| | - Rubi Khilari
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India
| | - Yamini Thakur
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India
| | - Bharati Verma
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India
| | - Manish Pardhi
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India
| | - Rama Pande
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India
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16
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Cao T, Zhang FT, Cai LY, Zhou YL, Buurma NJ, Zhang XX. Investigation of the interactions between methylene blue and intramolecular G-quadruplexes: an explicit distinction in electrochemical behavior. Analyst 2017; 142:987-993. [DOI: 10.1039/c7an00083a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An explicit difference for binding affinity between MB and different intramolecular G-quadruplexes was quickly and easily obtained by an electrochemical method.
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Affiliation(s)
- Ting Cao
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering
- College of Chemistry
- Peking University
- Beijing 100871
| | - Fang-Ting Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering
- College of Chemistry
- Peking University
- Beijing 100871
| | - Liang-Yuan Cai
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering
- College of Chemistry
- Peking University
- Beijing 100871
| | - Ying-Lin Zhou
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering
- College of Chemistry
- Peking University
- Beijing 100871
| | - Niklaas J. Buurma
- Physical Organic Chemistry Centre
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Xin-Xiang Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering
- College of Chemistry
- Peking University
- Beijing 100871
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17
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von Krbek LKS, Schalley CA, Thordarson P. Assessing cooperativity in supramolecular systems. Chem Soc Rev 2017; 46:2622-2637. [DOI: 10.1039/c7cs00063d] [Citation(s) in RCA: 162] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In this tutorial review, different aspects of cooperativity in supramolecular chemistry and their thermodynamic analysis are discussed.
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Affiliation(s)
| | | | - Pall Thordarson
- School of Chemistry
- The Australian Centre for Nanomedicine and the ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
- University of New South Wales
- Australia
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18
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Misra G, Gupta S, Jabalia N. Understanding the Interactions of High-Mobility Group of Protein Domain B1 with DNA Adducts Generated by Platinum Anticancer Molecules Using In Silico Approaches. Interdiscip Sci 2016; 10:476-485. [DOI: 10.1007/s12539-016-0204-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 10/21/2016] [Accepted: 11/21/2016] [Indexed: 11/29/2022]
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19
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Kenney RM, Buxton KE, Glazier S. Investigating the impacts of DNA binding mode and sequence on thermodynamic quantities and water exchange values for two small molecule drugs. Biophys Chem 2016; 216:9-18. [PMID: 27322498 DOI: 10.1016/j.bpc.2016.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 05/02/2016] [Accepted: 05/09/2016] [Indexed: 10/21/2022]
Abstract
Doxorubicin and nogalamycin are antitumor antibiotics that interact with DNA via intercalation and threading mechanisms, respectively. Because the importance of water, particularly its impact on entropy changes, has been established in other biological processes, we investigated the role of water in these two drug-DNA binding events. We used the osmotic stress method to calculate the number of water molecules exchanged (Δnwater), and isothermal titration calorimetry to measure Kbinding, ΔH, and ΔS for two synthetic DNAs, poly(dA·dT) and poly(dG·dC), and calf thymus DNA (CT DNA). For nogalamycin, Δnwater<0 for CT DNA and poly(dG·dC). For doxorubicin, Δnwater>0 for CT DNA and Δnwater<0 for poly(dG·dC). For poly(dA·dT), Δnwater~0 with both drugs. Net enthalpy changes were always negative, but net entropy changes depended on the drug. The effect of water exchange on the overall sign of entropy change appears to be smaller than other contributions.
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Affiliation(s)
- Rachael M Kenney
- Department of Chemistry, St. Lawrence University, 23 Romoda Drive, Canton, NY, USA; Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
| | - Katherine E Buxton
- Department of Chemistry, St. Lawrence University, 23 Romoda Drive, Canton, NY, USA; Department of Chemistry, University of Wisconsin, Madison, WI, USA.
| | - Samantha Glazier
- Department of Chemistry, St. Lawrence University, 23 Romoda Drive, Canton, NY, USA.
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20
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Hahn L, Buurma NJ, Gade LH. A Water-Soluble Tetraazaperopyrene Dye as Strong G-Quadruplex DNA Binder. Chemistry 2016; 22:6314-22. [PMID: 26997208 PMCID: PMC5071672 DOI: 10.1002/chem.201504934] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Indexed: 01/24/2023]
Abstract
The interactions of the water-soluble tetraazaperopyrene dye 1 with ct-DNA, duplex-[(dAdT)12 ⋅(dAdT)12 ], duplex-[(dGdC)12 ⋅(dGdC)12 ] as well as with two G-quadruplex-forming sequences, namely the human telomeric 22AG and the promotor sequence c-myc, were investigated by means of UV/visible and fluorescence spectroscopy, isothermal titration calorimetry (ITC) and molecular docking studies. Dye 1 exhibits a high affinity for G-quadruplex structures over duplex DNA structures. Furthermore, the ligand shows promising G-quadruplex discrimination, with an affinity towards c-myc of 2×10(7) m(-1) (i.e., Kd =50 nm), which is higher than for 22AG (4×10(6) m(-1) ). The ITC data reveal that compound 1 interacts with c-myc in a stoichiometric ratio of 1:1 but also indicate the presence of two identical lower affinity secondary binding sites per quadruplex. In 22AG, there are two high affinity binding sites per quadruplex, that is, one on each side, with a further four weaker binding sites. For both quadruplex structures, the high affinity interactions between compound 1 and the quadruplex-forming nucleic acid structures are weakly endothermic. Molecular docking studies suggest an end-stacking binding mode for compound 1 interacting with quadruplex structures, and a higher affinity for the parallel conformation of c-myc than for the mixed-hybrid conformation of 22AG. In addition, docking studies also suggest that the reduced affinity for duplex DNA structures is due to the non-viability of an intercalative binding mode.
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Affiliation(s)
- Lena Hahn
- Anorganisch-Chemisches-Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany), Fax
| | - Niklaas J Buurma
- Physical Organic Chemistry Centre, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK), Fax.
| | - Lutz H Gade
- Anorganisch-Chemisches-Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany), Fax.
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21
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Herrera I, Winnik MA. Differential Binding Models for Direct and Reverse Isothermal Titration Calorimetry. J Phys Chem B 2016; 120:2077-86. [PMID: 26889710 DOI: 10.1021/acs.jpcb.5b09202] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Isothermal titration calorimetry (ITC) is a technique to measure the stoichiometry and thermodynamics from binding experiments. Identifying an appropriate mathematical model to evaluate titration curves of receptors with multiple sites is challenging, particularly when the stoichiometry or binding mechanism is not available. In a recent theoretical study, we presented a differential binding model (DBM) to study calorimetry titrations independently of the interaction among the binding sites (Herrera, I.; Winnik, M. A. J. Phys. Chem. B 2013, 117, 8659-8672). Here, we build upon our DBM and show its practical application to evaluate calorimetry titrations of receptors with multiple sites independently of the titration direction. Specifically, we present a set of ordinary differential equations (ODEs) with the general form d[S]/dV that can be integrated numerically to calculate the equilibrium concentrations of free and bound species S at every injection step and, subsequently, to evaluate the volume-normalized heat signal (δQ(V) = δq/dV) of direct and reverse calorimetry titrations. Additionally, we identify factors that influence the shape of the titration curve and can be used to optimize the initial concentrations of titrant and analyte. We demonstrate the flexibility of our updated DBM by applying these differentials and a global regression analysis to direct and reverse calorimetric titrations of gadolinium ions with multidentate ligands of increasing denticity, namely, diglycolic acid (DGA), citric acid (CIT), and nitrilotriacetic acid (NTA), and use statistical tests to validate the stoichiometries for the metal-ligand pairs studied.
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Affiliation(s)
- Isaac Herrera
- Chemistry Department, University of Toronto , 80 St. George Street, Toronto ON, Canada , M5S 3H6
| | - Mitchell A Winnik
- Chemistry Department, University of Toronto , 80 St. George Street, Toronto ON, Canada , M5S 3H6
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22
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Manna SK, Mandal A, Mondal SK, Adak AK, Jana A, Das S, Chattopadhyay S, Roy S, Ghorai SK, Samanta S, Hossain M, Baidya M. Pyrido[1,2-a]pyrimidinium ions--a novel bridgehead nitrogen heterocycles: synthesis, characterisation, and elucidation of DNA binding and cell imaging properties. Org Biomol Chem 2015; 13:8037-47. [PMID: 26130466 DOI: 10.1039/c5ob01082a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel class of bridgehead nitrogen heterocycles, pyrido[1,2-a]pyrimidinium ions, has been readily synthesized by a two-step one-pot reaction in high yields (up to 93%). These ionic compounds are bench stable and moisture tolerant and have highly fluorescent properties (quantum yield up to 0.65). A characteristic bright bluish fluorescence was observed in polar solvents such as acetonitrile and fluorescent intensity gradually diminishes with decreasing the polarity of the medium, which becomes almost negligible in toluene. These compounds also show interesting bioactivity. DNA interaction, imaging, and viability experiments with human leukemic Jurkat and KG-1A cells revealed that they are potential candidates for cancer diagnosis.
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23
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Prentice GM, Pascu SI, Filip SV, West KR, Pantoş GD. Aromatic donor-acceptor interactions in non-polar environments. Chem Commun (Camb) 2015; 51:8265-8. [PMID: 25875729 DOI: 10.1039/c5cc00507h] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have evaluated the strength of aromatic donor-acceptor interactions between dialkyl naphthalenediimide and dialkoxynaphthalene in non-polar environments. (1)H NMR, UV-vis spectroscopy and isothermal titration calorimetry were used to characterise this interaction. We concluded that the strength of donor-acceptor interactions in heptane is sufficient to drive supramolecular assemblies in this and other aliphatic solvents.
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Affiliation(s)
- Giles M Prentice
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
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24
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Coupled equilibria of a self-associating drug loaded into polymeric nanoparticles. Methods 2015; 76:162-170. [DOI: 10.1016/j.ymeth.2014.12.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 12/13/2014] [Accepted: 12/15/2014] [Indexed: 11/19/2022] Open
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25
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Busto N, Cano B, Tejido R, Biver T, Leal JM, Venturini M, Secco F, García B. Aggregation features and fluorescence of Hoechst 33258. J Phys Chem B 2015; 119:4575-81. [PMID: 25759973 DOI: 10.1021/jp512306c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The functionality of the bisbenzimide Hoechst 33258 in solution has been largely exploited in the quantification of DNA. Understanding of its behavior is essential to promote its widespread application and learning of biological processes. A detailed study of the dimerization process of the fluorescent blue dye Hoechst 33258 is carried out by isothermal titration calorimetry, absorbance, fluorescence, differential scanning calorimetry and T-jump kinetic measurements. The dimer/monomer ratio depends on the dye concentration and the ionic strength. The dimerization constant determined under physiological conditions (pH = 7.0; I = 0.10 M), KD = 3 × 10(4) M(-1), conveys that only micromolar concentrations of the dye can ensure reasonably high amounts of the monomer species in solution. For instance, for 10 μM dye content, the dimer prevails for I > 0.08 M, whereas the monomer is observed at low ionic strength, a key issue to be elucidated as long as the dimer species is more fluorescent than the monomer and the fluorescence intensity strongly relies on the ionic strength and the dye concentration.
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Affiliation(s)
- Natalia Busto
- †Departamento de Química, Universidad de Burgos, 09001 Burgos, Spain
| | - Beatriz Cano
- †Departamento de Química, Universidad de Burgos, 09001 Burgos, Spain
| | - Rocío Tejido
- †Departamento de Química, Universidad de Burgos, 09001 Burgos, Spain
| | - Tarita Biver
- ‡Dipartimento di Chimica e Chimica Industriale, Università di Pisa, 56126 Pisa, Italy
| | - José M Leal
- †Departamento de Química, Universidad de Burgos, 09001 Burgos, Spain
| | - Marcella Venturini
- ‡Dipartimento di Chimica e Chimica Industriale, Università di Pisa, 56126 Pisa, Italy
| | - Fernando Secco
- ‡Dipartimento di Chimica e Chimica Industriale, Università di Pisa, 56126 Pisa, Italy
| | - Begoña García
- †Departamento de Química, Universidad de Burgos, 09001 Burgos, Spain
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26
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Hernandez Santiago AA, Buchelnikov AS, Rubinson MA, Yesylevskyy SO, Parkinson JA, Evstigneev MP. Shape-independent model (SHIM) approach for studying aggregation by NMR diffusometry. J Chem Phys 2015; 142:104202. [DOI: 10.1063/1.4913974] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Adrian A. Hernandez Santiago
- Department of Physics and Mathematics, Faculty of Chemistry, Autonomous University of Puebla, Puebla CP 72570, Mexico
| | | | - Maria A. Rubinson
- Department of Physics, Sevastopol State University, Universitetskaya str.33, Sevastopol 299053, Ukraine
| | - Semen O. Yesylevskyy
- Department of Physics of Biological Systems, Institute of Physics of the National Academy of Sciences of Ukraine, Prospect Nauky 46, Kiev-28 03680, Ukraine
| | - John A. Parkinson
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Maxim P. Evstigneev
- Department of Biology and Chemistry, Belgorod State University, Belgorod 308015, Russia
- Department of Physics, Sevastopol State University, Universitetskaya str.33, Sevastopol 299053, Ukraine
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27
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Rubinson M, Parkinson J, Evstigneev M. Entropic binding mode preference in cooperative homo-dimeric drug–DNA recognition. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.02.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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28
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Alniss HY, Salvia MV, Sadikov M, Golovchenko I, Anthony NG, Khalaf AI, MacKay SP, Suckling CJ, Parkinson JA. Recognition of the DNA minor groove by thiazotropsin analogues. Chembiochem 2014; 15:1978-90. [PMID: 25045155 DOI: 10.1002/cbic.201402202] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Indexed: 01/14/2023]
Abstract
Solution-phase self-association characteristics and DNA molecular-recognition properties are reported for three close analogues of minor-groove-binding ligands from the thiazotropsin class of lexitropsin molecules; they incorporate isopropyl thiazole as a lipophilic building block. Thiazotropsin B (AcImPy(iPr) ThDp) shows similar self-assembly characteristics to thiazotropsin A (FoPyPy(iPr) ThDp), although it is engineered, by incorporation of imidazole in place of N-methyl pyrrole, to swap its DNA recognition target from 5'-ACTAGT-3' to 5'-ACGCGT-3'. Replacement of the formamide head group in thiazotropsin A by nicotinamide in AIK-18/51 results in a measureable difference in solution-phase self-assembly character and substantially enhanced DNA association characteristics. The structures and associated thermodynamic parameters of self-assembled ligand aggregates and their complexes with their respective DNA targets are considered in the context of cluster targeting of DNA by minor-groove complexes.
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Affiliation(s)
- Hasan Y Alniss
- Department of Pharmacy, An-Najah National University, University Street, Nablus (Palestine); Present address: Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario M5S 2J7 (Canada)
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29
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Xu X, Yan S, Zhou Y, Huang R, Chen Y, Wang J, Weng X, Zhou X. A novel aggregation-induced emission fluorescent probe for nucleic acid detection and its applications in cell imaging. Bioorg Med Chem Lett 2014; 24:1654-6. [DOI: 10.1016/j.bmcl.2014.02.071] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 02/19/2014] [Accepted: 02/25/2014] [Indexed: 10/25/2022]
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30
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31
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Olesiak-Banska J, Matczyszyn K, Zaleśny R, Murugan NA, Kongsted J, Ågren H, Bartkowiak W, Samoc M. Revealing Spectral Features in Two-Photon Absorption Spectrum of Hoechst 33342: A Combined Experimental and Quantum-Chemical Study. J Phys Chem B 2013; 117:12013-9. [DOI: 10.1021/jp407144k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Joanna Olesiak-Banska
- Institute of Physical
and Theoretical Chemistry, Wrocław University of Technology, Wyb. Wyspiańskiego
27, PL-50370 Wrocław, Poland
| | - Katarzyna Matczyszyn
- Institute of Physical
and Theoretical Chemistry, Wrocław University of Technology, Wyb. Wyspiańskiego
27, PL-50370 Wrocław, Poland
| | - Robert Zaleśny
- Institute of Physical
and Theoretical Chemistry, Wrocław University of Technology, Wyb. Wyspiańskiego
27, PL-50370 Wrocław, Poland
- Division of Theoretical
Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - N. Arul Murugan
- Division of Theoretical
Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Jacob Kongsted
- Department
of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Hans Ågren
- Division of Theoretical
Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Wojciech Bartkowiak
- Institute of Physical
and Theoretical Chemistry, Wrocław University of Technology, Wyb. Wyspiańskiego
27, PL-50370 Wrocław, Poland
| | - Marek Samoc
- Institute of Physical
and Theoretical Chemistry, Wrocław University of Technology, Wyb. Wyspiańskiego
27, PL-50370 Wrocław, Poland
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32
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Herrera I, Winnik MA. Differential binding models for isothermal titration calorimetry: moving beyond the Wiseman isotherm. J Phys Chem B 2013; 117:8659-72. [PMID: 23841823 DOI: 10.1021/jp311812a] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We present a set of model-independent differential equations to analyze isothermal titration calorimetry (ITC) experiments. In contrast with previous approaches that begin with specific assumptions about the number of binding sites and the interactions among them (e.g., sequential, independent, cooperative), our derivation makes more general assumptions, such that a receptor with multiple sites for one type of ligand species (homotropic binding) can be studied with the same analytical expression. Our approach is based on the binding polynomial formalism, and the resulting analytical expressions can be extended to account for any number of binding sites and any type of binding interaction among them. We refer to the set of model-independent differential equations to study ITC experiments as a differential binding model (DBM). To demonstrate the flexibility of our DBM, we present the analytical expressions to study receptors with one or two binding sites. The DBM for a receptor with one site is equivalent to the Wiseman isotherm but with a more intuitive representation that depends on the binding polynomial and the dimensionless parameter c = K·MT, where K is the binding constant and MT the total receptor concentration. In addition, we show how to constrain the general DBM for a receptor with two sites to represent sequential, independent, or cooperative binding interactions between the sites. We use the sequential binding model to study the binding interaction between Gd(III) and citrate anions. In addition, we simulate calorimetry titrations of receptors with positive, negative, and noncooperative interactions between the two binding sites. Finally, we derive a DBM for titrations of receptors with n-independent binding sites.
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Affiliation(s)
- Isaac Herrera
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto ON Canada M5S 3H6
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Taladriz-Blanco P, Pastoriza-Santos V, Pérez-Juste J, Hervés P. Controllable nitric oxide release in the presence of gold nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8061-8069. [PMID: 23718250 DOI: 10.1021/la4014762] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A major problem associated with nitric oxide (NO) donors is the release of the desired amount of NO at a specific site. A number of platforms have been developed for the regulation of NO dosage. We present the use of citrate-stabilized gold nanoparticles as a platform to regulate NO release. Because of the affinity between gold and thiols, the characteristic -S-NO bond of S-nitrosothiols (RSNOs) breaks in the presence of gold nanoparticles, thereby releasing NO and modifying the gold nanoparticle surface with the corresponding thiol. This system allows for surface-controlled NO release, where the amount of NO released is proportional to the number of thiols bound to the gold nanoparticle surface. Moreover, by employing an amperometric technique to detect the maximum NO release, we were able to estimate the stoichiometry of the reaction, that is, the number of adsorbed RSNO molecules per gold nanoparticle. A kinetic model for NO release and its subsequent decomposition is proposed and used to fit the experimental results. The reaction was found to be zeroth- and first-order with respect to RSNO and gold nanoparticles, respectively.
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Dávila-Ibáñez AB, Buurma NJ, Salgueiriño V. Assessment of DNA complexation onto polyelectrolyte-coated magnetic silica nanoparticles. NANOSCALE 2013; 5:4797-4807. [PMID: 23612682 DOI: 10.1039/c3nr34358h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The polyelectrolyte-DNA complexation method to form magnetoplexes using silica-coated iron oxide magnetic nanoparticles as inorganic substrates is an attractive and promising process in view of the potential applications including magnetofection, DNA extraction and purification, and directed assembly of nanostructures. Herein, we present a systematic physico-chemical study that provides clear evidence of the type of interactions established, reflects the importance of the DNA length, the nanoparticle size and the ionic strength, and permits the identification of the parameters controlling both the stability and the type of magnetoplexes formed. This information can be used to develop targeted systems with properties optimized for the various proposed applications of magnetoplexes.
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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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Zhang XF, Zhao JL, Bi WB, Zhang DD, Yang ZY, Wang LY. Synthesis, Crystal Structure, Spectral and Thermodynamic Properties of One Benzoindole Pentamethine Cyanine Dye. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201200405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Salvia MV, Addison F, Alniss HY, Buurma NJ, Khalaf AI, Mackay SP, Anthony NG, Suckling CJ, Evstigneev MP, Santiago AH, Waigh RD, Parkinson JA. Thiazotropsin aggregation and its relationship to molecular recognition in the DNA minor groove. Biophys Chem 2013; 179:1-11. [PMID: 23714424 DOI: 10.1016/j.bpc.2013.04.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Revised: 04/19/2013] [Accepted: 04/19/2013] [Indexed: 11/29/2022]
Abstract
Aggregated states have been alluded to for many DNA minor groove binders but details of the molecule-on-molecule relationship have either been under-reported or ignored. Here we report our findings from ITC and NMR measurements carried out with AIK-18/51, a compound representative of the thiazotropsin class of DNA minor groove binders. The free aqueous form of AIK-18/51 is compared with that found in its complex with cognate DNA duplex d(CGACTAGTCG)2. Molecular self-association of AIK-18/51 is consistent with anti-parallel, face-to-face dimer formation, the building block on which the molecule aggregates. This underlying structure is closely allied to the form found in the ligand's DNA complex. NMR chemical shift and diffusion measurements yield a self-association constant Kass=(61±19)×10(3)M(-1) for AIK-18/51 that fits with a stepwise self-assembly model and is consistent with ITC data. The deconstructed energetics of this assembly process are reported with respect to a design strategy for ligand/DNA recognition.
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Affiliation(s)
- Marie-Virginie Salvia
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
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Hong Y, Chen S, Leung CWT, Lam JWY, Tang BZ. Water-Soluble Tetraphenylethene Derivatives as Fluorescent “Light-Up” Probes for Nucleic Acid Detection and Their Applications in Cell Imaging. Chem Asian J 2013; 8:1806-12. [DOI: 10.1002/asia.201300065] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 03/13/2013] [Indexed: 11/06/2022]
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Balagurumoorthy P, Xu X, Wang K, Adelstein SJ, Kassis AI. Effect of distance between decaying (125)I and DNA on Auger-electron induced double-strand break yield. Int J Radiat Biol 2012; 88:998-1008. [PMID: 22732063 DOI: 10.3109/09553002.2012.706360] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To determine the possible effects of (125)I-to-DNA distance on the magnitude and mechanism of Auger-electron induced-double-strand break (DSB) production. MATERIALS AND METHODS We have synthesized a series of (125)I-labeled Hoechst (H) derivatives ((125)IE-H, (125)IB-H, (125)I-C(8)-H and (125)I-C(12)-H). While all four molecules share a common DNA minor groove binding bis-benzimidazole motif, they are designed to position (125)I at varying distances from the DNA helix. Each Hoechst derivative was incubated at 4°C in phosphate buffered saline (PBS) together with supercoiled (SC) (3)H-pUC19 plasmid DNA (ratio 3:1) ± the •OH scavenger dimethyl sulfoxide (DMSO) (0.2 M). Aliquots were analyzed on agarose gels over time and DSB yields per decay of (125)I atom were determined. Docking of the iodinated compounds on a DNA molecule was carried out to determine the distance between the iodine atom and the central axis of DNA. RESULTS In the absence of DMSO, the results show that the DSB yields decrease monotonically as the (125)I atom is distanced - by 10.5 Å to 13.9 Å - from the DNA helix ((125)IEH: 0.52 ± 0.01; (125)IB-H: 0.24 ± 0.03; (125)I-C(8)-H: 0.18 ± 0.02; (125)I-C(12)-H: 0.10 ± 0.00). In the presence of DMSO, DSB yields for (125)IEH (0.49 ± 0.02) and (125)IB-H (0.26 ± 0.04) remain largely unchanged indicating that DSB are entirely produced by direct effects. Strikingly, (125)I-C(8)-H or (125)I-C(12)-H, did not produce detectable DSB in the presence of DMSO under similar conditions suggesting when (125)I atom is positioned > 12 Å from the DNA, DSB are entirely produced by indirect effects. CONCLUSION These results suggest that at a critical distance between the (125)I atom and the DNA helix, DSB production switches from an 'all' direct to an 'all' indirect mechanism, the latter situation being comparable to the decay of (125)I free in solution. These experimental findings were correlated with theoretical expectations based on microdosimetry.
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40
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Bessi I, Bazzicalupi C, Richter C, Jonker HRA, Saxena K, Sissi C, Chioccioli M, Bianco S, Bilia AR, Schwalbe H, Gratteri P. Spectroscopic, molecular modeling, and NMR-spectroscopic investigation of the binding mode of the natural alkaloids berberine and sanguinarine to human telomeric G-quadruplex DNA. ACS Chem Biol 2012; 7:1109-19. [PMID: 22486369 DOI: 10.1021/cb300096g] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
G-quadruplex structures can be formed at the single-stranded overhang of telomeric DNA, and ligands able to stabilize this structure have recently been identified as potential anticancer drugs. Among the potential G-quadruplex binders, we have studied the binding ability of berberine and sanguinarine, two members of the alkaloid family, an important class of natural products long known for medicinal purpose. Our spectroscopic (CD, NMR, and fluorescence) studies and molecular modeling approaches revealed binding modes at ligand-complex stoichiometries >1:1 and ligand self-association induced by DNA for the interactions of the natural alkaloids berberine and sanguinarine with the human telomeric G-quadruplex DNA.
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Affiliation(s)
- Irene Bessi
- Center for Biomolecular Magnetic
Resonance, Institute of Organic Chemistry and Chemical Biology, Johann Wolfgang Goethe-University Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt/Main, Germany
| | - Carla Bazzicalupi
- Department of Chemistry “Ugo
Schiff”, University of Firenze,
Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
| | - Christian Richter
- Center for Biomolecular Magnetic
Resonance, Institute of Organic Chemistry and Chemical Biology, Johann Wolfgang Goethe-University Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt/Main, Germany
| | - Hendrik R. A. Jonker
- Center for Biomolecular Magnetic
Resonance, Institute of Organic Chemistry and Chemical Biology, Johann Wolfgang Goethe-University Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt/Main, Germany
| | - Krishna Saxena
- Center for Biomolecular Magnetic
Resonance, Institute of Organic Chemistry and Chemical Biology, Johann Wolfgang Goethe-University Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt/Main, Germany
| | - Claudia Sissi
- Department of Pharmaceutical
Sciences, University of Padova, Via Marzolo
5, 35100 Padova, Italy
| | | | - Sara Bianco
- Department of Pharmaceutical
Sciences, University of Padova, Via Marzolo
5, 35100 Padova, Italy
| | | | - Harald Schwalbe
- Center for Biomolecular Magnetic
Resonance, Institute of Organic Chemistry and Chemical Biology, Johann Wolfgang Goethe-University Frankfurt, Max-von-Laue-Strasse
7, 60438 Frankfurt/Main, Germany
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Willerich I, Gröhn F. Molecular structure encodes nanoscale assemblies: understanding driving forces in electrostatic self-assembly. J Am Chem Soc 2011; 133:20341-56. [PMID: 22050129 DOI: 10.1021/ja207565m] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Supramolecular nanoparticles represent a key field in recent research as their synthesis through self-assembly is straightforward and they often can respond to external triggers. A fundamental understanding of structure-directing factors is highly desirable for a targeted structure design. This contribution demonstrates a quantitative relation between the size of supramolecular self-assembled nanoparticles and the free energy of association. Nanoparticles are prepared by electrostatic self-assembly of cationic polyelectrolyte dendrimers as model macroions and oppositely charged di- and trivalent organic dye molecules relying on the combination of electrostatic and π-π-interactions. A systematic set of sulfonate-group carrying azo-dyes was synthesized. Light scattering and ζ-potential measurements on the resulting nanoparticles yield hydrodynamic radii between 20 nm < R(H) < 50 nm and positive ζ-potential values indicating a positive particle charge. Studies on dye self-aggregation and dendrimer-dye association by isothermal titration calorimetry (ITC) and UV-vis spectroscopy allow for the correlation of the thermodynamic parameters of dendrimer-dye association with the size of the particles, showing that at least a free energy gain of ΔG ≈ - 32 kJ mol(-1) is necessary to induce dendrimer interconnection. Structural features of the azo dyes causing these to favor or prevent nanoparticle formation have been identified. The dye-dye-interaction was found to be the key factor in particle size control. A simple model yields a quantitative relation between the free energy and the particle sizes, allowing for predicting the latter based on thermodynamic measurements. Hence, a set of different molecular "building bricks" can be defined where the choice of building block determines the resulting assembly size.
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Affiliation(s)
- Immanuel Willerich
- Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-University Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
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Childs-Disney JL, Tsitovich PB, Disney MD. Using modularly assembled ligands to bind RNA internal loops separated by different distances. Chembiochem 2011; 12:2143-6. [PMID: 21830289 PMCID: PMC3378996 DOI: 10.1002/cbic.201100298] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Indexed: 01/12/2023]
Affiliation(s)
- Jessica L. Childs-Disney
- Canisius College, Department of Chemistry and Biochemistry, 2001 Main Street, Buffalo, NY 14208 (USA)
| | - Pavel B. Tsitovich
- Department of Chemistry, University at Buffalo, The State University of New York, Natural Sciences Complex, Buffalo, NY 14260 (USA)
| | - Matthew D. Disney
- Department of Chemistry, The Scripps Research Institute, Scripps Florida, 130 Scripps Way, Jupiter, FL 33458 (USA)
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Taladriz-Blanco P, Buurma NJ, Rodríguez-Lorenzo L, Pérez-Juste J, Liz-Marzán LM, Hervés P. Reversible assembly of metal nanoparticles induced by penicillamine. Dynamic formation of SERS hot spots. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12175h] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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44
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Hansen LD, Fellingham GW, Russell DJ. Simultaneous determination of equilibrium constants and enthalpy changes by titration calorimetry: Methods, instruments, and uncertainties. Anal Biochem 2010; 409:220-9. [PMID: 21073852 DOI: 10.1016/j.ab.2010.11.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 10/28/2010] [Accepted: 11/03/2010] [Indexed: 11/16/2022]
Abstract
Calorimetric methods have been used to determine equilibrium constants since 1937, but no comprehensive review of the various calorimeters and methods has been done previously. This article reports methods for quantitative comparison of the capabilities of calorimeters for simultaneous determination of equilibrium constants and enthalpy changes, for determining optimal experimental conditions, and for assessing the effects of systematic and random errors on the accuracy and precision of equilibrium constants and enthalpy changes determined by this method.
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Affiliation(s)
- Lee D Hansen
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA.
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Wheelhouse RT, Garbett NC, Buurma NJ, Chaires JB. Probing the molecular recognition of a DNA.RNA hybrid duplex. Angew Chem Int Ed Engl 2010; 49:3207-10. [PMID: 20352639 DOI: 10.1002/anie.200907235] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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46
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Wheelhouse R, Garbett N, Buurma N, Chaires J. Probing the Molecular Recognition of a DNA⋅RNA Hybrid Duplex. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200907235] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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47
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Survey of the year 2008: applications of isothermal titration calorimetry. J Mol Recognit 2010; 23:395-413. [DOI: 10.1002/jmr.1025] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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48
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Nieuwenhuizen M, de Greef T, van der Bruggen R, Paulusse J, Appel W, Smulders M, Sijbesma R, Meijer E. Self-Assembly of Ureido-Pyrimidinone Dimers into One-Dimensional Stacks by Lateral Hydrogen Bonding. Chemistry 2010; 16:1601-12. [DOI: 10.1002/chem.200902107] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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49
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Mucsi Z, Chass GA, Csizmadia IG. Systemic energy management by strategically located functional components within molecular frameworks, determined by systems chemistry. J Phys Chem B 2009; 113:10308-14. [PMID: 19572662 DOI: 10.1021/jp903760p] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A novel concept and, therefore, a novel discipline is defined, wherein molecules are described as frameworks of strategically located functional components within molecular structures, acting in unison to effect efficient energy management. The term "systems chemistry" effectively serves to define the phenomenon of an assembly of atoms and functional groups within a molecule having systemic properties "valued" at more than their component sum. The reduction of NAD+ and FAD is complimented by an enthalpy transfer between organic functional components (aromatic ring, amide and olefinic functionalities), yet the sum of the overall energy values (the total system) remains nearly constant, irrespective of which direction the redox reaction proceeds. From this aspect, both NAD+ and FAD operate as real chemical systems of atoms and functional groups, working together within the individual molecules to store the reaction enthalpy as resonance enthalpy, rather than manifesting it as emitted or absorbed heat. In this way, the thermoneutral reaction of the wet combustion occurring in all living cells is made possible by an internal "cooling process".
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Affiliation(s)
- Zoltán Mucsi
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6.
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50
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De Greef TFA, Smulders MMJ, Wolffs M, Schenning APHJ, Sijbesma RP, Meijer EW. Supramolecular Polymerization. Chem Rev 2009; 109:5687-754. [DOI: 10.1021/cr900181u] [Citation(s) in RCA: 1869] [Impact Index Per Article: 124.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Tom F. A. De Greef
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Maarten M. J. Smulders
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Martin Wolffs
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Albert P. H. J. Schenning
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Rint P. Sijbesma
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - E. W. Meijer
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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