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Patel SK, Patel RN, Patel AK, Patel N, Coloma I, Cortijo M, Herrero S, Choquesillo-Lazarte D. Synthesis, single crystal structures, DFT and in vitro anti oxidant superoxide dismutase studies of copper(II) complexes derived from the di-(2-picolyl)amine and co-ligands: Promising antioxidants. Polyhedron 2022. [DOI: 10.1016/j.poly.2021.115609] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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2
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Synthesis and characterization of penta-coordinated copper(II) complexes with hydrazido based ligand and imidazole as auxiliary ligand. J INDIAN CHEM SOC 2021. [DOI: 10.1016/j.jics.2021.100182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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3
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Yousuf I, Bashir M, Arjmand F, Tabassum S. Advancement of metal compounds as therapeutic and diagnostic metallodrugs: Current frontiers and future perspectives. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214104] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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4
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Patel AK, Jadeja RN, Butcher R, Kesharwani MK, Kästner J, Muddassir M. New copper(II) complexes with (Z)-N′-{(2-hydroxynaphthalen-1-yl}methylene)acetohydrazide]: X-ray structure, Hirshfeld analysis, X-band electron paramagnetic resonance spectra, TD-DFT calculations and superoxide dismutase mimetic activity. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.114969] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Almeida VYG, Rocha JS, Felix DP, Oliveira GP, Lima MA, Farias RL, Zanetti RD, Netto AVG, Zambom CR, Garrido SS, Rocha FV. Cytotoxicity and Antibacterial Activity of Silver Complexes Bearing Semicarbazones and Triphenylphosphine. ChemistrySelect 2020. [DOI: 10.1002/slct.202004093] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Vitor Y. G. Almeida
- Chemistry Department, Federal University of São Carlos, Rod. Washington Luis, Km 235 São Carlos, São Paulo ZIP 13565-905 Brazil
| | - Josias S. Rocha
- Chemistry Department, Federal University of São Carlos, Rod. Washington Luis, Km 235 São Carlos, São Paulo ZIP 13565-905 Brazil
| | - Débora P. Felix
- Chemistry Department, Federal University of São Carlos, Rod. Washington Luis, Km 235 São Carlos, São Paulo ZIP 13565-905 Brazil
| | - Gabriela P. Oliveira
- Chemistry Department, Federal University of São Carlos, Rod. Washington Luis, Km 235 São Carlos, São Paulo ZIP 13565-905 Brazil
| | - Mauro A. Lima
- Chemistry Department, Federal University of São Carlos, Rod. Washington Luis, Km 235 São Carlos, São Paulo ZIP 13565-905 Brazil
| | - Renan L. Farias
- Department of Analytical Chemistry Physicochemical and Inorganic Chemistry. UNESP – Univ Estadual Paulista, Institute of Chemistry, Av. Prof. Francisco Degni, 55, Araraquara São Paulo ZIP 14800-900 Brazil
| | - Renan D. Zanetti
- Department of Analytical Chemistry Physicochemical and Inorganic Chemistry. UNESP – Univ Estadual Paulista, Institute of Chemistry, Av. Prof. Francisco Degni, 55, Araraquara São Paulo ZIP 14800-900 Brazil
| | - Adelino V. G. Netto
- Department of Analytical Chemistry Physicochemical and Inorganic Chemistry. UNESP – Univ Estadual Paulista, Institute of Chemistry, Av. Prof. Francisco Degni, 55, Araraquara São Paulo ZIP 14800-900 Brazil
| | - Carolina R. Zambom
- Department of Biochemistry and Organic Chemistry. UNESP – Univ Estadual Paulista, Institute of Chemistry Av. Prof. Francisco Degni, 55 Araraquara, São Paulo ZIP 14800-900 Brazil
| | - Saulo S. Garrido
- Department of Biochemistry and Organic Chemistry. UNESP – Univ Estadual Paulista, Institute of Chemistry Av. Prof. Francisco Degni, 55 Araraquara, São Paulo ZIP 14800-900 Brazil
| | - Fillipe V. Rocha
- Chemistry Department, Federal University of São Carlos, Rod. Washington Luis, Km 235 São Carlos, São Paulo ZIP 13565-905 Brazil
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Singh Y, Patel RN, Patel SK, Patel AK, Patel N, Singh R, Butcher R, Jasinski JP, Gutierrez A. Experimental and quantum computational study of two new bridged copper(II) coordination complexes as possible models for antioxidant superoxide dismutase: Molecular structures, X-band electron paramagnetic spectra and cryogenic magnetic properties. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.07.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Rai J, Basumatary B, Bhandary S, Murugavel M, Sankar J. A tris-(manganese(iii))corrole–porphyrin–corrole triad: synthesis, characterization and catalytic epoxidation. Dalton Trans 2019; 48:7394-7402. [DOI: 10.1039/c9dt00965e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A homotrimetallic manganese(iii) corrole–porphyrin–corrole triad has been synthesized and structurally characterized.
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Affiliation(s)
- Jyoti Rai
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal-462066
- India
| | - Biju Basumatary
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal-462066
- India
| | - Subhrajyoti Bhandary
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal-462066
- India
| | - Muthuchamy Murugavel
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal-462066
- India
| | - Jeyaraman Sankar
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal-462066
- India
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Patel RN, Singh Y, Singh YP, Patel AK, Patel N, Singh R, Butcher RJ, Jasinski JP, Colacio E, Palacios MA. Varying structural motifs, unusual X-band electron paramagnetic spectra, DFT studies and superoxide dismutase enzymatic activity of copper(ii) complexes with N′-[(E)-phenyl(pyridin-2-yl)methylidene]benzohydrazide. NEW J CHEM 2018. [DOI: 10.1039/c7nj04182a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A diverse set of new copper(ii) complexes synthesized as possible models for antioxidant superoxide dismutase mimics.
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Affiliation(s)
- Ram N. Patel
- Department of Chemistry
- A.P.S. University
- Rewa
- India
| | | | | | | | - Neetu Patel
- Department of Chemistry
- A.P.S. University
- Rewa
- India
| | - Rita Singh
- Department of Physics
- Govt. Model Science College
- Rewa
- India
| | - Raymond J. Butcher
- Department of Inorganic & Structural Chemistry
- Howard University
- Washington
- USA
| | | | - Enrique Colacio
- Departamento de Quimica Inorganica
- Universidad de Granada
- Granada
- Spain
| | - Maria A. Palacios
- Departamento de Quimica Inorganica
- Universidad de Granada
- Granada
- Spain
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Shahabadi N, Hakimi M, Morovati T, Fatahi N. DNA binding affinity of a macrocyclic copper(II) complex: Spectroscopic and molecular docking studies. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2017; 36:497-510. [PMID: 28758878 DOI: 10.1080/15257770.2017.1332370] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The interaction of a novel macrocyclic copper(II) complex, ([CuL(ClO4)2] that L is 1,3,6,10,12,15-hexaazatricyclo[13.3.1.16,10]eicosane) with calf thymus DNA (ct-DNA) was investigated by various physicochemical techniques and molecular docking at simulated physiological conditions (pH = 7.4). The absorption spectra of the Cu(II) complex with ct-DNA showed a marked hyperchroism with 10 nm blue shift. The intrinsic binding constant (Kb) was determined as 1.25 × 104 M-1, which is more in keeping with the groove binding with DNA. Furthermore, competitive fluorimetric studies with Hoechst33258 have shown that Cu(II) complex exhibits the ability to displace the ct-DNA-bound Hoechst33258 indicating that it binds to ct-DNA in strong competition with Hoechst33258 for the groove binding. Also, no change in the relative viscosity of ct-DNA and fluorescence intensity of ct-DNA-MB complex in the present of Cu(II) complex is another evidence to groove binding. The thermodynamic parameters are calculated by van't Hoff equation, which demonstrated that hydrogen bonds and van der Waals interactions played major roles in the binding reaction. The experimental results were in agreement with the results obtained via molecular docking study.
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Affiliation(s)
- Nahid Shahabadi
- a Inorganic Chemistry Department, Faculty of Chemistry , Razi University , Kermanshah , Iran.,b Medical Biology Research Center (MBRC) , Kermanshah University of Medical Sciences , Kermanshah , Iran
| | - Mohammad Hakimi
- c Department of Chemistry , Payame Noor University , Tehran , Iran
| | - Teimoor Morovati
- c Department of Chemistry , Payame Noor University , Tehran , Iran
| | - Navid Fatahi
- d Pharmacy College , Kermanshah University of Medical Science , Kermanshah , Iran
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Ghosh A. Electronic Structure of Corrole Derivatives: Insights from Molecular Structures, Spectroscopy, Electrochemistry, and Quantum Chemical Calculations. Chem Rev 2017; 117:3798-3881. [PMID: 28191934 DOI: 10.1021/acs.chemrev.6b00590] [Citation(s) in RCA: 218] [Impact Index Per Article: 31.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Presented herein is a comprehensive account of the electronic structure of corrole derivatives. Our knowledge in this area derives from a broad range of methods, including UV-vis-NIR absorption and MCD spectroscopies, single-crystal X-ray structure determination, vibrational spectroscopy, NMR and EPR spectroscopies, electrochemistry, X-ray absorption spectroscopy, and quantum chemical calculations, the latter including both density functional theory and ab initio multiconfigurational methods. The review is organized according to the Periodic Table, describing free-base and main-group element corrole derivatives, then transition-metal corroles, and finally f-block element corroles. Like porphyrins, corrole derivatives with a redox-inactive coordinated atom follow the Gouterman four-orbital model. A key difference from porphyrins is the much wider prevalence of noninnocent electronic structures as well as full-fledged corrole•2- radicals among corrole derivatives. The most common orbital pathways mediating ligand noninnocence in transition-metal corroles are the metal(dz2)-corrole("a2u") interaction (most commonly observed in Mn and Fe corroles) and the metal(dx2-y2)-corrole(a2u) interaction in coinage metal corroles. Less commonly encountered is the metal(dπ)-corrole("a1u") interaction, a unique feature of formal d5 metallocorroles. Corrole derivatives exhibit a rich array of optical properties, including substituent-sensitive Soret maxima indicative of ligand noninnocence, strong fluorescence in the case of lighter main-group element complexes, and room-temperature near-IR phosphorescence in the case of several 5d metal complexes. The review concludes with an attempt at identifying gaps in our current knowledge and potential future directions of electronic-structural research on corrole derivatives.
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Affiliation(s)
- Abhik Ghosh
- Department of Chemistry and Center for Theoretical and Computational Chemistry, UiT-The Arctic University of Norway , 9037 Tromsø, Norway
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11
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Demkowicz S, Rachon J, Daśko M, Kozak W. Selected organophosphorus compounds with biological activity. Applications in medicine. RSC Adv 2016. [DOI: 10.1039/c5ra25446a] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The purpose of this article is to provide an overview of the latest applications of organophosphorus compounds (OPs) that exhibit biological activity.
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Affiliation(s)
- Sebastian Demkowicz
- Department of Organic Chemistry
- Chemical Faculty
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
| | - Janusz Rachon
- Department of Organic Chemistry
- Chemical Faculty
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
| | - Mateusz Daśko
- Department of Organic Chemistry
- Chemical Faculty
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
| | - Witold Kozak
- Department of Organic Chemistry
- Chemical Faculty
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
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Li W, Wang H, Chen Z, Ye Q, Tian Y, Xu X, Huang Z, Li P, Tan X. Probing the metal specificity mechanism of superoxide dismutase from human pathogen Clostridium difficile. Chem Commun (Camb) 2014; 50:584-6. [DOI: 10.1039/c3cc47859a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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13
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Enos G, Mambanda A, Jaganyi D. Substitution of aqua ligands from alkyldiamine-bridged dinuclear Pt(II) complexes using azole nucleophiles. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.867026] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Gerald Enos
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Allen Mambanda
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Deogratius Jaganyi
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
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Lampropoulos C, Stamatatos TC, Manos MJ, Tasiopoulos AJ, Abboud KA, Christou G. New Mixed-Valence MnII/III6 Complexes Bearing Oximato and Azido Ligands: Synthesis, and Structural and Magnetic Characterization. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200901013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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Fukuzumi S. Roles of Metal Ions in Controlling Bioinspired Electron-Transfer Systems. Metal Ion-Coupled Electron Transfer. PROGRESS IN INORGANIC CHEMISTRY 2009. [DOI: 10.1002/9780470440124.ch2] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Bertini I, Cavallaro G. Metals in the “omics” world: copper homeostasis and cytochrome c oxidase assembly in a new light. J Biol Inorg Chem 2007; 13:3-14. [DOI: 10.1007/s00775-007-0316-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2007] [Accepted: 10/25/2007] [Indexed: 01/20/2023]
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Yuasa J, Suenobu T, Fukuzumi S. Binding modes in metal ion complexes of quinones and semiquinone radical anions: electron-transfer reactivity. Chemphyschem 2007; 7:942-54. [PMID: 16521156 DOI: 10.1002/cphc.200500640] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
9,10-Phenanthrenequinone (PQ) and 1,10-phenanthroline-5,6-dione (PTQ) form 1:1 and 2:1 complexes with metal ions (M (n+)=Sc (3+), Y (3+), Mg (2+), and Ca (2+)) in acetonitrile (MeCN), respectively. The binding constants of PQ--M (n+) complexes vary depending on either the Lewis acidity or ion radius of metal ions. The one-electron reduced species (PTQ(-)) forms 1:1 complexes with M (n+), and PQ(-) also forms 1:1 complexes with Sc(3+), Mg(2+), and Ca(2+), whereas PQ(-) forms 1:2 complexes with Y(3+) and La(3+), as indicated by electron spin resonance (ESR) measurements. On the other hand, semiquinone radical anions (Q(-) and NQ(-)) derived from p-benzoquinone (Q) and 1,4-naphthoquinone (NQ) form Sc(3+)-bridged pi-dimer radical anion complexes, Q(-)--(Sc(3+))(n)--Q and NQ(-)--(Sc(3+))(n)-NQ (n=2 and 3), respectively. The one-electron reduction potentials of quinones (PQ, PTQ, and Q) are largely positively shifted in the presence of M (n+). The rate constant of electron transfer from CoTPP (TPP(2-)=dianion of tetraphenylporphyrin) to PQ increases with increasing the concentration of Sc(3+) to reach a constant value, when all PQ molecules form the 1:1 complex with Sc(3+). Rates of electron transfer from 10,10'-dimethyl-9,9'-biacridine [(AcrH)(2)] to PTQ are also accelerated significantly by the presence of Sc(3+), Y(3+), and Mg(2+), exhibiting a first-order dependence with respect to concentrations of metal ions. In contrast to the case of o-quinones, unusually high kinetic orders are observed for rates of Sc(3+)-promoted electron transfer from tris(2-phenylpyridine)iridium(III) [Ir(ppy)(3)] to p-quinones (Q): second-order dependence on concentration of Q, and second- and third-order dependence on concentration of Sc(3+) due to formation of highly ordered radical anion complexes, Q()--(Sc(3+))(n)--Q (n=2 and 3).
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Affiliation(s)
- Junpei Yuasa
- Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, SORST, Japan
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Nishat N, Rahisuddin, Haq MM, Kumar V. Synthesis, characterization and antimicrobial activity studies of N - N ′-tetracarboxydiethyloxamide ligand and its metal(II) complexes. J COORD CHEM 2007. [DOI: 10.1080/00958970600611673] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- N. Nishat
- a Department of Chemistry , Jamia Millia Islamia , New Delhi – 110025, India
| | - Rahisuddin
- a Department of Chemistry , Jamia Millia Islamia , New Delhi – 110025, India
| | - M. M. Haq
- a Department of Chemistry , Jamia Millia Islamia , New Delhi – 110025, India
| | - Vikrant Kumar
- a Department of Chemistry , Jamia Millia Islamia , New Delhi – 110025, India
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Mathur S, Tabassum S. Synthesis and Characterization of a New Macrocyclic Copper(II) Complex with anN-Glycosidic Pendant Arm:in vitro Cytotoxicity and Binding Studies with Calf-Thymus DNA. Chem Biodivers 2006; 3:312-25. [PMID: 17193268 DOI: 10.1002/cbdv.200690034] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The new macrocyclic complex 2-amino-2-deoxy-N-[2-(1,3,5,8,11-pentaazacyclotridecan-3-yl)ethyl]-beta-D-glucopyranosylamine copper(II) dichloride (1a) was prepared and thoroughly characterized by various techniques. Molar-conductance measurements showed that 1a (and its Ni analogue 1b) are ionic in nature. On the basis of spectroscopic data, both complexes were assigned a square-planar geometry, and found to be highly stabile and hydrolytically robust in H2O over a wide range of pH, as confirmed by cyclic voltammetry (CV). The Cu(II) complex 1a was found to bind to CT-DNA, with a binding constant Kb of 2.4x10(3) M(-1), as derived by UV/VIS titration, and confirmed by CV, circular dichroism (CD), and viscosity measurements. DNA binding seems to occur mostly via H-bonding. In an in vitro antitumor MTT assay, 1a exhibited significant anticancer activity against the SY5Y and PC-12 cell lines, with an estimated IC50 value in the micromolar range for SYSY, similar to the standard drug 5-fluorouracil.
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Affiliation(s)
- Suvigya Mathur
- Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
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Reedijk J. New clues for platinum antitumor chemistry: kinetically controlled metal binding to DNA. Proc Natl Acad Sci U S A 2003; 100:3611-6. [PMID: 12655051 PMCID: PMC152970 DOI: 10.1073/pnas.0737293100] [Citation(s) in RCA: 497] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
From the metal ions and metal compounds that are known to bind to DNA, many anticancer Pt(II) and Ru(II)Ru(III) compounds are known to have ligand-exchange kinetics in the same order of magnitude as the division of tumor cells. The present article discusses this process in detail with special attention to cisplatin and related compounds and the cellular binding sites and processes of such compounds. Detailed platinated DNA structures are presented and discussed in light of the mechanistic studies of metal antitumor compounds. It is now known that platinum antitumor drugs eventually end up on the DNA. However, it remains a challenge to understand how (fast) they reach the DNA and how they are removed. The kinetics of ligand exchange around platinum appear to play a crucial role, and the possible role of other ligands as intermediates, especially those with S-donor sites, is of great interest. New types of Pt compounds with additional functionalities influencing DNA binding and kinetics are discussed in the context of steric and H-bonding properties. A comparison is made with more sterically crowded Ru complexes. The effects on activity and correlations with structural and kinetic properties are clues in understanding the biological activities of these classes of compounds.
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Affiliation(s)
- Jan Reedijk
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands.
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23
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Lippert B. Impact of Cisplatin on the recent development of Pt coordination chemistry: a case study. Coord Chem Rev 1999. [DOI: 10.1016/s0010-8545(98)00192-1] [Citation(s) in RCA: 149] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Abstract
The structures and reactions of metal ions in proteins are of tremendous interest in bioinorganic chemistry, as is the potential for metals in creating novel medicines. New results combine these aspects in describing an unexpected mode for metal-mediated drug efficacy that relies on well-established principles of metalloprotein structure.
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Affiliation(s)
- H H Thorp
- Department of Chemistry, University of North Carolina, Chapel Hill 27599-3290, USA
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Electron-, Energy-, and Atom-Transfer Reactions Between Metal Complexes and Dna. ADVANCES IN INORGANIC CHEMISTRY 1995. [DOI: 10.1016/s0898-8838(08)60117-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Collman JP, Wagenknecht PS, Hutchison JE. Cofaciale Bis(metallo)diporphyrine als potentielle molekulare Katalysatoren für Mehrelektronenreduktionen und -oxidationen kleiner Moleküle. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941061505] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
It is currently thought that nuclear pore complexes (NPCs) primarily govern nucleocytoplasmic interactions via selective recognition and active transport of macromolecules. However, in various nuclear preparations, patch-clamp and fluorescence, luminiscence and ion microscopy support classical microelectrode measurements indicating that monoatomic ion flow across the nuclear envelope (NE) is strictly regulated. Gating of large conductance nuclear envelope ion channels (NICs) somewhat resembles that of gap junctional channels. In other respects, NICs are distinct in that they require cytosolic factors, are blocked by wheat germ agglutinin and are blocked and/or modified by antibodies to epitopes of NPC glycoproteins. Therefore, NIC activity, recorded as electrical current/conductance is likely to be intrinsic to NPCs. This observation suggests a potential use for the patch-clamp technique in establishing the mechanisms underlying nuclear pore gating in response to cytosolic and nucleosolic factors such as transcription and growth factors, oncogene and proto-oncogene products and receptors for retinoids, steroids and thyroid hormone. NIC activity may also be useful in evaluating the mechanisms of nuclear import of foreign nucleic acid material such as that contained in virons and viroids. Finally, in consideration to the electrophysiological data accumulated so far, the study of nuclear pore ion channel activity may help our understanding of other important issues such as cell suicide, programmed cell death or apoptosis.
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Affiliation(s)
- J O Bustamante
- University of Maryland School of Medicine, Department of Medicine, Baltimore 21021-1559
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Affiliation(s)
- J O Bustamante
- University of Maryland School of Medicine, Department of Medicine, Baltimore 21201-1559
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Blanchard JP, Blackman CF. Clarification and application of an ion parametric resonance model for magnetic field interactions with biological systems. Bioelectromagnetics 1994; 15:217-38. [PMID: 8074738 DOI: 10.1002/bem.2250150306] [Citation(s) in RCA: 158] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Theoretical models proposed to date have been unable to clearly predict biological results from exposure to low-intensity electric and magnetic fields (EMF). Recently a predictive ionic resonance model was proposed by Lednev, based on an earlier atomic spectroscopy theory described by Podgoretskii and Podgoretskii and Khrustalev. The ion parametric resonance (IPR) model developed in this paper corrects mathematical errors in the earlier Lednev model and extends that model to give explicit predictions of biological responses to parallel AC and DC magnetic fields caused by field-induced changes in combinations of ions within the biological system. Distinct response forms predicted by the IPR model depend explicitly on the experimentally controlled variables: magnetic flux densities of the AC and DC magnetic fields (Bac and Bdc, respectively); AC frequency (fac); and, implicitly, charge to mass ratio of target-ions. After clarifying the IPR model and extending it to combinations of different resonant ions, this paper proposes a basic set of experiments to test the IPR model directly which do not rely on the choice of a particular specimen or endpoint. While the fundamental bases of the model are supported by a variety of other studies, the IPR model is necessarily heuristic when applied to biological systems, because it is based on the premise that the magnitude and form of magnetic field interactions with unhydrated resonant ions in critical biological structures alter ion-associated biological activities that may in turn be correlated with observable effects in living systems.
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Affiliation(s)
- J P Blanchard
- Rochtel Corporation, San Francisco, California 94119-3965
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Blackman CF, Blanchard JP, Benane SG, House DE. Empirical test of an ion parametric resonance model for magnetic field interactions with PC-12 cells. Bioelectromagnetics 1994; 15:239-60. [PMID: 8074739 DOI: 10.1002/bem.2250150307] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A companion paper describes a predictive ion parametric resonance (IPR) model of magnetic field interactions with biological systems based on a selective relation between the ratio of the flux density of the static magnetic field to the AC magnetic field and the charge-to-mass ratio of ions of biological relevance. Previous studies demonstrated that nerve growth factor (NGF)-stimulated neurite outgrowth (NO) in PC-12 cells can be inhibited by exposure to magnetic fields as a function of either magnetic field flux density or AC magnetic field frequency. The present work examines whether the PC-12 cell response to magnetic fields is consistent with the quasi-periodic, resonance-based predictions of the IPR model. We tested changes in each of the experimentally controllable variables [flux densities of the parallel components of the AC magnetic field (Bac) and the static magnetic field (Bdc) and the frequency of the AC magnetic field] over a range of exposure conditions sufficient to determine whether the IPR model is applicable. A multiple-coil exposure system independently controlled each of these critical quantities. The perpendicular static magnetic field was controlled to less than 2 mG for all tests. The first set of tests examined the NO response in cells exposed to 45 Hz Bac from 77 to 468 mG(rms) at a Bdc of 366 mG. Next, we examined an off-resonance condition using 20 mG Bdc with a 45 Hz AC field across a range of Bac between 7.9 and 21 mG(rms). Finally, we changed the AC frequency to 25 Hz, with a corresponding change in Bdc to 203 mG (to tune for the same set of ions as in the first test) and a Bac range from 78 to 181 mG(rms). In all cases the observed responses were consistent with predictions of the IPR model. These experimental results are the first to support in detail the validity of the fundamental relationships embodied in the IPR model.
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Affiliation(s)
- C F Blackman
- Health Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711
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