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Al-Harazie AG, Gomaa EA, Zaky RR, Abd El-Hady MN. Spectroscopic Characterization, Cyclic Voltammetry, Biological Investigations, MOE, and Gaussian Calculations of VO(II), Cu(II), and Cd(II) Heteroleptic Complexes. ACS OMEGA 2023; 8:13605-13625. [PMID: 37091434 PMCID: PMC10116629 DOI: 10.1021/acsomega.2c07592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 03/28/2023] [Indexed: 05/03/2023]
Abstract
A novel hydrazone ligand (o-H2BMP) N-(benzo[d]thiazol-2-yl)-3-oxo-3-(2-(1-(pyridin-2-yl)ethylidene)hydrazinyl)propanamide alongside its Cu(II), Cd(II), and VO(II) complexes were prepared and structurally characterized via various spectroscopic analyses (Fourier transform infrared spectroscopy, UV-visible spectroscopy, 1H/13C NMR spectroscopy, liquid chromatography coupled to mass spectrometry, and electron paramagnetic resonance spectroscopy) as well as by elemental analysis, thermal gravimetry analysis/differential thermal analysis, and magnetic moment measurements. Powder X-ray diffraction analysis was also performed for the free ligand and its metal complexes to determine the crystallographic structures and atomic spacing. It also provided information on unit cell dimensions and the average crystallite size. Furthermore, geometric optimization and computational studies were carried out by applying Gaussian (09) software based on density-functional theory coupled with the B3LYP functional and LANL2DZ/6-31+G(d,p) mixed basis set to evaluate some distinct features such as molecular electrostatic potential, E HOMO, and E LUMO. Moreover, electrochemical measurements were performed for Cu(II) in the absence/presence of the chelating agent to predict the effect of complexation interaction in the solution state study. As part of the biological examination, antioxidant and antimicrobial assays were conducted for each compound individually, in addition to cytotoxicity evaluations via MTT assays for all isolated complexes compared to the corresponding metal salts. The MOE (molecular operating environment) approach was also applied to model the interface between the isolated compounds and proteins that were expressed in breast cancer at the atomic level.
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Affiliation(s)
- Anwer G. Al-Harazie
- Chemistry
Department, Faculty of Education and Applied Sciences—Arhab, Sana’a University, Sana’a 1247, Yemen
- Chemistry
Department, Faculty of Science, Mansoura
University, Mansoura 35511, Egypt
- ,
| | - Esam A. Gomaa
- Chemistry
Department, Faculty of Science, Mansoura
University, Mansoura 35511, Egypt
| | - Rania R. Zaky
- Chemistry
Department, Faculty of Science, Mansoura
University, Mansoura 35511, Egypt
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Missina JM, Ronqui Bottini RC, Baptistella GB, Santana FS, Stinghen D, Lemos de Sá E, Gioppo Nunes G. Synthesis, characterization, DFT calculations and bromoperoxidase activity of binuclear oxidovanadium complexes containing vitamin B6. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2135993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
| | | | | | | | - Danilo Stinghen
- Departamento de Química, Universidade Federal do Paraná, Curitiba-PR, Brazil
| | - Eduardo Lemos de Sá
- Departamento de Química, Universidade Federal do Paraná, Curitiba-PR, Brazil
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Bottini RC, Fachini LG, Baptistella GB, Stinghen D, Santana FS, Briganti M, Ribeiro RR, Soares JF, Sá EL, Nunes GG. An unsymmetrical mixed-valence oxidovanadium(IV/V) binuclear complex: Synthesis, characterization, DFT studies, and bromoperoxidase activity. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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An oxalate-bridged oxidovanadium(IV) binuclear complex that improves the in vitro cell uptake of a fluorescent glucose analog. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115071] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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5
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Damon PL, Liss CJ, Lewis RA, Morochnik S, Szpunar DE, Telser J, Hayton TW. Quantifying the Electron Donor and Acceptor Abilities of the Ketimide Ligands in M(N═C(t)Bu2)4 (M = V, Nb, Ta). Inorg Chem 2015; 54:10081-95. [PMID: 26419513 PMCID: PMC4659433 DOI: 10.1021/acs.inorgchem.5b02017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Addition of 4 equiv of Li(N═C(t)Bu2) to VCl3 in THF, followed by addition of 0.5 equiv of I2, generates the homoleptic V(IV) ketimide complex, V(N═C(t)Bu2)4 (1), in 42% yield. Similarly, reaction of 4 equiv of Li(N═C(t)Bu2) with NbCl4(THF)2 in THF affords the homoleptic Nb(IV) ketimide complex, Nb(N═C(t)Bu2)4 (2), in 55% yield. Seeking to extend the series to the tantalum congener, a new Ta(IV) starting material, TaCl4(TMEDA) (3), was prepared via reduction of TaCl5 with Et3SiH, followed by addition of TMEDA. Reaction of 3 with 4 equiv of Li(N═C(t)Bu2) in THF results in the isolation of a Ta(V) ketimide complex, Ta(Cl)(N═C(t)Bu2)4 (5), which can be isolated in 32% yield. Reaction of 5 with Tl(OTf) yields Ta(OTf)(N═C(t)Bu2)4 (6) in 44% yield. Subsequent reduction of 6 with Cp*2Co in toluene generates the homoleptic Ta(IV) congener Ta(N═C(t)Bu2)4 (7), although the yields are poor. All three homoleptic group 5 ketimide complexes exhibit squashed tetrahedral geometries in the solid state, as determined by X-ray crystallography. This geometry leads to a d(x(2)-y(2))(1) ((2)B1 in D(2d)) ground state, as supported by DFT calculations. EPR spectroscopic analysis of 1 and 2, performed at X- and Q-band frequencies (∼9 and 35 GHz, respectively), further supports the (2)B1 ground-state assignment, whereas comparison of 1, 2, and 7 with related group 5 tetra(aryl), tetra(amido), and tetra(alkoxo) complexes shows a higher M-L covalency in the ketimide-metal interaction. In addition, a ligand field analysis of 1 and 2 demonstrates that the ketimide ligand is both a strong π-donor and strong π-acceptor, an unusual combination found in very few organometallic ligands.
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Affiliation(s)
- Peter L. Damon
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Cameron J. Liss
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, 430 S. Michigan Ave. Chicago, Illinois 60605-1394 United States
| | - Richard A. Lewis
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Simona Morochnik
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - David E. Szpunar
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, 430 S. Michigan Ave. Chicago, Illinois 60605-1394 United States
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, 430 S. Michigan Ave. Chicago, Illinois 60605-1394 United States
| | - Trevor W. Hayton
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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6
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Costa Pessoa J, Garribba E, Santos MF, Santos-Silva T. Vanadium and proteins: Uptake, transport, structure, activity and function. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2015.03.016] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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7
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Krzystek J, Ozarowski A, Telser J, Crans DC. High-frequency and -field electron paramagnetic resonance of vanadium(IV, III, and II) complexes. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.10.014] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Makinen MW, Salehitazangi M. The Structural Basis of Action of Vanadyl (VO 2+) Chelates in Cells. Coord Chem Rev 2014; 279:1-22. [PMID: 25237207 DOI: 10.1016/j.ccr.2014.07.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Much emphasis has been given to vanadium compounds as potential therapeutic reagents for the treatment of diabetes mellitus. Thus far, no vanadium compound has proven efficacious for long-term treatment of this disease in humans. Therefore, in review of the research literature, our goal has been to identify properties of vanadium compounds that are likely to favor physiological and biochemical compatibility for further development as therapeutic reagents. We have, therefore, limited our review to those vanadium compounds that have been used in both in vivo experiments with small, laboratory animals and in in vitro studies with primary or cultured cell systems and for which pharmacokinetic and pharmacodynamics results have been reported, including vanadium tissue content, vanadium and ligand lifetime in the bloodstream, structure in solution, and interaction with serum transport proteins. Only vanadyl (VO2+) chelates fulfill these requirements despite the large variety of vanadium compounds of different oxidation states, ligand structure, and coordination geometry synthesized as potential therapeutic agents. Extensive review of research results obtained with use of organic VO2+-chelates shows that the vanadyl chelate bis(acetylacetonato)oxidovanadium(IV) [hereafter abbreviated as VO(acac)2], exhibits the greatest capacity to enhance insulin receptor kinase activity in cells compared to other organic VO2+-chelates, is associated with a dose-dependent capacity to lower plasma glucose in diabetic laboratory animals, and exhibits a sufficiently long lifetime in the blood stream to allow correlation of its dose-dependent action with blood vanadium content. The properties underlying this behavior appear to be its high stability and capacity to remain intact upon binding to serum albumin. We relate the capacity to remain intact upon binding to serum albumin to the requirement to undergo transcytosis through the vascular endothelium to gain access to target tissues in the extravascular space. Serum albumin, as the most abundant transport protein in the blood stream, serves commonly as the carrier protein for small molecules, and transcytosis of albumin through capillary endothelium is regulated by a Src protein tyrosine kinase system. In this respect it is of interest to note that inorganic VO2+ has the capacity to enhance insulin receptor kinase activity of intact 3T3-L1 adipocytes in the presence of albumin, albeit weak; however, in the presence of transferrin no activation is observed. In addition to facilitating glucose uptake, the capacity of VO2+- chelates for insulin-like, antilipolytic action in primary adipocytes has also been reviewed. We conclude that measurement of inhibition of release of only free fatty acids from adipocytes stimulated by epinephrine is not a sufficient basis to ascribe the observations to purely insulin-mimetic, antilipolytic action. Adipocytes are known to contain both phosphodiesterase-3 and phosphodiesterase-4 (PDE3 and PDE4) isozymes, of which insulin antagonizes lipolysis only through PDE3B. It is not known whether the other isozyme in adipocytes is influenced directly by VO2+- chelates. In efforts to promote improved development of VO2+- chelates for therapeutic purposes, we propose synergism of a reagent with insulin as a criterion for evaluating physiological and biochemical specificity of action. We highlight two organic compounds that exhibit synergism with insulin in cellular assays. Interestingly, the only VO2+- chelate for which this property has been demonstrated, thus far, is VO(acac)2.
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Affiliation(s)
- Marvin W Makinen
- Department of Biochemistry & Molecular Biology, Gordon Center for Integrative Science, The University of Chicago, 929 East 57 Street, Chicago, Illinois 60637 USA
| | - Marzieh Salehitazangi
- Department of Biochemistry & Molecular Biology, Gordon Center for Integrative Science, The University of Chicago, 929 East 57 Street, Chicago, Illinois 60637 USA
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Martínez-Lillo J, Mastropietro TF, Lhotel E, Paulsen C, Cano J, De Munno G, Faus J, Lloret F, Julve M, Nellutla S, Krzystek J. Highly Anisotropic Rhenium(IV) Complexes: New Examples of Mononuclear Single-Molecule Magnets. J Am Chem Soc 2013; 135:13737-48. [DOI: 10.1021/ja403154z] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- José Martínez-Lillo
- Departament
de Química Inorgànica/Instituto de Ciencia Molecular
(ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna (València), Spain
| | - Teresa F. Mastropietro
- Centro
di Eccellenza CEMIF.CAL, Dipartimento di Chimica, Università della Calabria, 87030 Arcavacata di Rende, Cosenza, Italy
| | - Elsa Lhotel
- Institut Néel-CNRS, BP
166, 25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Carley Paulsen
- Institut Néel-CNRS, BP
166, 25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Joan Cano
- Departament
de Química Inorgànica/Instituto de Ciencia Molecular
(ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna (València), Spain
- Fundació
General de la Universitat de València (FGUV), Universitat de València, 46010 València, Spain
| | - Giovanni De Munno
- Centro
di Eccellenza CEMIF.CAL, Dipartimento di Chimica, Università della Calabria, 87030 Arcavacata di Rende, Cosenza, Italy
| | - Juan Faus
- Departament
de Química Inorgànica/Instituto de Ciencia Molecular
(ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna (València), Spain
| | - Francesc Lloret
- Departament
de Química Inorgànica/Instituto de Ciencia Molecular
(ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna (València), Spain
| | - Miguel Julve
- Departament
de Química Inorgànica/Instituto de Ciencia Molecular
(ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna (València), Spain
| | - Saritha Nellutla
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - J. Krzystek
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
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Justino GC, Garribba E, Pessoa JC. Binding of VIVO2+ to the Fe binding sites of human serum transferrin. A theoretical study. J Biol Inorg Chem 2013; 18:803-13. [DOI: 10.1007/s00775-013-1029-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2013] [Accepted: 08/03/2013] [Indexed: 10/26/2022]
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11
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Mehtab S, Gonçalves G, Roy S, Tomaz AI, Santos-Silva T, Santos MFA, Romão MJ, Jakusch T, Kiss T, Pessoa JC. Interaction of vanadium(IV) with human serum apo-transferrin. J Inorg Biochem 2013; 121:187-95. [PMID: 23411030 DOI: 10.1016/j.jinorgbio.2012.12.020] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Revised: 12/27/2012] [Accepted: 12/28/2012] [Indexed: 10/27/2022]
Abstract
The interaction of V(IV)O-salts as well as of a few V(IV)O(carrier)n complexes with human serum transferrin (hTF) is studied focusing on the determination of the nature and stoichiometry of the binding of V(IV)O(2+) to hTF, as well as whether the conformation of hTF upon binding to V(IV)O(2+) or to its complexes is changed. Circular dichroism (CD) spectra measured for solutions containing V(IV)O(2+) and apo-hTF, and V(IV)O-maltol and apo-hTF, clearly indicate that hTF-V(IV)O-maltol ternary species form with a V(IV)O:maltol stoichiometry of 1:1. For V(IV)O salts and several V(IV)O(carrier)n complexes (carrier ligand=maltolato, dhp, picolinato and dipicolinato) (Hdhp=1,2-dimethyl-3-hydroxy-4-pyridinone) the maximum number of V(IV)O(2+) bound per mole of hTF is determined to be ~2 or lower in all cases. The binding of V(IV)O to apo-hTF most certainly involves several amino acid residues of the Fe-binding site, and as concluded by urea gel electrophoresis experiments, the formation of (V(IV)O)2hTF species may occur with the closing of the hTF conformation as is the case in (Fe(III))2hTF, which is an essential feature for the transferrin receptor recognition.
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Affiliation(s)
- Sameena Mehtab
- Centro Química Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
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12
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Gonçalves G, Tomaz I, Correia I, Veiros LF, Castro MMCA, Avecilla F, Palacio L, Maestro M, Kiss T, Jakusch T, Garcia MHV, Pessoa JC. A novel VIVO–pyrimidinone complex: synthesis, solution speciation and human serum protein binding. Dalton Trans 2013; 42:11841-61. [DOI: 10.1039/c3dt50553g] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Liu JH, He ZZ, Kong F, Xu X, Sun CF, Mao JG. Syntheses, crystal structures and characterizations of new vanadium arsenites and arsenates. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.04.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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14
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Wu C, Zhang X, Dai J, Yang J, Wu Z, Wei S, Xie Y. Direct hydrothermal synthesis of monoclinic VO2(M) single-domain nanorods on large scale displaying magnetocaloric effect. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03078c] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
The complexation of the VO(2+) ion in several systems that can model the physiological conditions of its transport in blood serum was studied using electron paramagnetic resonance (EPR) spectroscopy. Particularly, the ternary systems formed by (i) VO(2+) and two high-molecular-mass components of blood serum, human serum apo-transferrin (hTf) and human serum albumin (HSA); (ii) VO(2+), hTf, and bL; and (iii) VO(2+), HSA, and bL, where bL is one of the six most important low-molecular-mass bioligands of the blood serum (bL = lactate, citrate, oxalate, phosphate, glycine, or histidine), were examined. The results indicate that, in aqueous solution, transferrin is a stronger binder than albumin, and at the physiological ratio, most of the VO(2+) ion is present as (VO)(2)hTf, and a small amount as (VO)(2)(d)HSA, the dinuclear species formed by albumin where the two metal ions are interacting and the spin state S is 1. Among the bL ligands, only lactate and citrate are able to bind VO(2+) in the presence of transferrin or albumin, the others not interacting at all. Finally, the quaternary systems formed by (i) VO(2+), hTf, HSA, and lactate and (ii) VO(2+), hTf, HSA, and citrate were studied. In these cases, the results suggest that the predominant species is (VO)(2)hTf, followed by the mixed complexes VO(2+)-hTf-lactate or VO(2+)-hTf-citrate, whereas (VO)(2)(d)HSA and [(VO)(2)(citrH(-1))(2)](4-) are minor components at physiological pH. The conclusions of this study give new insights on how the VO(2+) ion distributes among the blood serum components and is transported in the plasma toward the target sites in the organism.
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Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
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Sanna D, Buglyó P, Micera G, Garribba E. A quantitative study of the biotransformation of insulin-enhancing VO2+ compounds. J Biol Inorg Chem 2010; 15:825-39. [DOI: 10.1007/s00775-010-0647-9] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Accepted: 03/02/2010] [Indexed: 11/24/2022]
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Sanna D, Micera G, Garribba E. New Developments in the Comprehension of the Biotransformation and Transport of Insulin-Enhancing Vanadium Compounds in the Blood Serum. Inorg Chem 2009; 49:174-87. [DOI: 10.1021/ic9017213] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Giovanni Micera
- Dipartimento di Chimica e Centro Interdisciplinare per lo Sviluppo della Ricerca Biotecnologica e per lo Studio della Biodiversità della Sardegna, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
| | - Eugenio Garribba
- Dipartimento di Chimica e Centro Interdisciplinare per lo Sviluppo della Ricerca Biotecnologica e per lo Studio della Biodiversità della Sardegna, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
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Benmelouka M, Vanâ
Tol J, Borel A, Nellutla S, Port M, Helm L, Brunel LC, Merbach A. Multiple-Frequency and Variable-Temperature EPR Study of Gadolinium(III) Complexes with Polyaminocarboxylates: Analysis and Comparison of the Magnetically Dilute Powder and the Frozen-Solution Spectra. Helv Chim Acta 2009. [DOI: 10.1002/hlca.200900117] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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19
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Interaction of VO2+ ion with human serum transferrin and albumin. J Inorg Biochem 2009; 103:648-55. [DOI: 10.1016/j.jinorgbio.2009.01.002] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2008] [Revised: 12/29/2008] [Accepted: 12/30/2008] [Indexed: 11/18/2022]
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20
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Jakusch T, Hollender D, Enyedy ÉA, González CS, Montes-Bayón M, Sanz-Medel A, Costa Pessoa J, Tomaz I, Kiss T. Biospeciation of various antidiabetic VIVO compounds in serum. Dalton Trans 2009:2428-37. [DOI: 10.1039/b817748a] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Pordea A, Creus M, Panek J, Duboc C, Mathis D, Novic M, Ward TR. Artificial Metalloenzyme for Enantioselective Sulfoxidation Based on Vanadyl-Loaded Streptavidin. J Am Chem Soc 2008; 130:8085-8. [DOI: 10.1021/ja8017219] [Citation(s) in RCA: 137] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anca Pordea
- Institute of Chemistry, University of Neuchâtel, Avenue Bellevaux 51, CP 158,2009 Neuchâtel, Switzerland, Laboratory of Chemometrics, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia, and Département de Chimie Moléculaire UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
| | - Marc Creus
- Institute of Chemistry, University of Neuchâtel, Avenue Bellevaux 51, CP 158,2009 Neuchâtel, Switzerland, Laboratory of Chemometrics, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia, and Département de Chimie Moléculaire UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
| | - Jaroslaw Panek
- Institute of Chemistry, University of Neuchâtel, Avenue Bellevaux 51, CP 158,2009 Neuchâtel, Switzerland, Laboratory of Chemometrics, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia, and Département de Chimie Moléculaire UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
| | - Carole Duboc
- Institute of Chemistry, University of Neuchâtel, Avenue Bellevaux 51, CP 158,2009 Neuchâtel, Switzerland, Laboratory of Chemometrics, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia, and Département de Chimie Moléculaire UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
| | - Déborah Mathis
- Institute of Chemistry, University of Neuchâtel, Avenue Bellevaux 51, CP 158,2009 Neuchâtel, Switzerland, Laboratory of Chemometrics, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia, and Département de Chimie Moléculaire UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
| | - Marjana Novic
- Institute of Chemistry, University of Neuchâtel, Avenue Bellevaux 51, CP 158,2009 Neuchâtel, Switzerland, Laboratory of Chemometrics, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia, and Département de Chimie Moléculaire UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
| | - Thomas R. Ward
- Institute of Chemistry, University of Neuchâtel, Avenue Bellevaux 51, CP 158,2009 Neuchâtel, Switzerland, Laboratory of Chemometrics, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia, and Département de Chimie Moléculaire UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
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Borel A, Clarkson RB, Belford RL. Stochastic Liouville equation treatment of the electron paramagnetic resonance line shape of an S-state ion in solution. J Chem Phys 2007; 126:054510. [PMID: 17302488 DOI: 10.1063/1.2433947] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The current approaches used for the analysis of electron paramagnetic resonance spectra of Gd3+ complexes suffer from a number of drawbacks. Even the elaborate model of [Rast et al., J. Chem. Phys. 113, 8724 (2000)] where the electron spin relaxation is explained by the modulation of the zero-field splitting (ZFS), by molecular tumbling (the so called static contribution), and deformations (transient contribution), is only readily applicable within the validity range of the Redfield theory [Advances in Magnetic Resonance, edited by J.-S. Waugh (Academic, New York, 1965), Vol. 1, p. 1], that is, when the ZFS is small compared to the Zeeman energy and the rotational and vibrational modulations are fast compared to the relaxation time. Spin labels (nitroxides and transition metal complexes) have been studied for years in systems that violate these conditions. The theoretical framework commonly used in such studies is the stochastic Liouville equation (SLE). The authors shall show how the physical model of Rast et al. can be cast into the SLE formalism, paying special attention to the specific problems introduced by the [Uhlenbeck and Ornstein, Phys. Rev. 36, 823 (1930)] process used to model the transient ZFS. The resulting equations are very general and valid for arbitrary correlation times, magnetic field strength, electron spin S, or symmetry. The authors demonstrate the equivalence of the SLE approach with the Redfield approximation for two well-known Gd3+ complexes.
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Affiliation(s)
- Alain Borel
- Illinois EPR Research Center, Department of Chemistry, University of Illinois, Urbana, Illinois, USA.
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Kiss T, Jakusch T, Bouhsina S, Sakurai H, Enyedy ÉA. Binding Constant of VIVO to Transferrin. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600314] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Benmelouka M, Van Tol J, Borel A, Port M, Helm L, Brunel LC, Merbach AE. A High-Frequency EPR Study of Frozen Solutions of GdIII Complexes: Straightforward Determination of the Zero-Field Splitting Parameters and Simulation of the NMRD Profiles. J Am Chem Soc 2006; 128:7807-16. [PMID: 16771494 DOI: 10.1021/ja0583261] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Gd(III) (S = 7/2) polyaminocarboxylates, used as contrast agents for Magnetic Resonance Imaging (MRI), were studied in frozen solutions by High-Frequency-High-Field Electron Paramagnetic Resonance (HF-EPR). EPR spectra recorded at 240 GHz and temperatures below 150 K allowed the direct and straightforward determination of parameters governing the strength of zero-field splitting (ZFS). For the first time, a correlation has been established between the sign of the axial ZFS parameter, D, and the nature of the chelating ligand in Gd(III) complexes: positive and negative signs have been observed for acyclic and macrocyclic complexes, respectively. Furthermore, it has been shown that complexes of the less symmetric acyclic DTPA derivatives possess a substantial rhombicity, E, in contrast to the more symmetric macrocyclic DOTA derivatives, where E is negligible. The results obtained are compatible with recent results of liquid-state EPR and allowed to simulate 1H Nuclear Magnetic Relaxation Dispersion (NMRD) profiles with more directly physically meaningful EPR and NMR parameters over the full frequency range from 0.01 to 50 MHz.
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Affiliation(s)
- Meriem Benmelouka
- Laboratoire de Chimie Inorganique et Bioinorganique, Ecole Polytechnique Fédérale de Lausanne, EPFL-BCH, CH-1015 Lausanne, Switzerland
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Krzystek J, Telser J. High frequency and field EPR spectroscopy of Mn(III) complexes in frozen solutions. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2003; 162:454-465. [PMID: 12810031 DOI: 10.1016/s1090-7807(03)00042-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We have performed high-frequency and -field electron paramagnetic resonance (HFEPR) experiments on two complexes of high-spin Mn(III) (3d(4),S=2): mesotetrasulfonato-porphyrinatomanganese(III) (Mn(TSP)) and [(R,R)-(-)-N,N(')-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediaminomanganese(III)] (Mn(salen)). The main aim of this work was to qualitatively and quantitatively characterize the conditions suitable for HFEPR of high-spin transition metal complexes in frozen solutions, and compare them with experiments performed on solid samples. Mn(TSP) is a porphyrin complex soluble in water, in contrast to most metalloporphyrins. Mn(salen), often referred to as Jacobsen's catalyst, is a complex widely used in organic synthesis for alkene epoxidation, and is soluble in organic solvents. High-quality HFEPR signals were observed for solid state Mn(TSP), as has been previously shown for many Mn(III) complexes. The present study is, however, the first to report high-quality HFEPR spectra of a Mn(III) complex in frozen aqueous solution. Analysis of the data yielded the following spin Hamiltonian parameters: S=2; D=-3.16+/-0.02 cm(-1), E=0, and isotropic g=2.00(2). No X-band EPR signals were observed for Mn(TSP), which is a consequence of this being a rigorously axial spin system. Mn(salen), in contrast, did not give good quality HFEPR spectra in the solid state, but high-quality HFEPR spectra were recorded in frozen organic solutions. Analysis of the data yielded the following spin Hamiltonian parameters: S=2; D=-2.47+/-0.02 cm(-1), |E|=0.17+/-0.01 cm(-1), and isotropic g=2.00(2). These values differ from those reported using X-band parallel mode EPR [J. Am. Chem. Soc. 123 (2001) 5710], as discussed in the text. Therefore, a comparison between HFEPR and parallel-mode X-band spectroscopy is made. Finally, the concentration sensitivity aspect of HFEPR spectroscopy is also discussed.
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Affiliation(s)
- J Krzystek
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA.
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Makinen MW, Brady MJ. Structural origins of the insulin-mimetic activity of bis(acetylacetonato)oxovanadium(IV). J Biol Chem 2002; 277:12215-20. [PMID: 11815612 DOI: 10.1074/jbc.m110798200] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have investigated the interaction of bis(acetylacetonato)oxovanadium(IV) (VO(acac)(2)) with bovine serum albumin (BSA) by EPR and angle-selected electron nuclear double resonance, correlating results with assays of glucose uptake by 3T3-L1 adipocytes. EPR spectra of VO(acac)(2) showed no broadening in the presence of BSA; however, electron nuclear double resonance titrations of VO(acac)(2) in the presence of BSA were indicative of adduct formation of VO(acac)(2) with albumin of 1:1 stoichiometry. The influence of VO(acac)(2) on uptake of 2-deoxy-d-[1-(14)C]glucose by serum-starved 3T3-L1 adipocytes was measured in the presence and absence of BSA. Glucose uptake was stimulated 9-fold in the presence of 0.5 mm VO(acac)(2), 17-fold in the presence of 0.5 mm VO(acac)(2) plus 1 mm BSA, and 22-fold in the presence of 100 nm insulin. BSA had no influence on glucose uptake, on the action of insulin, or on glucose uptake in the presence of VOSO(4). The maximum insulin-mimetic effect of VO(acac)(2) was observed at VO(acac)(2):BSA ratios less than or equal to 1.0. Similar results were obtained also with bis(maltolato)oxovanadium(IV). These results suggest that the enhanced insulin-mimetic action of organic chelates of VO(2+) may be dependent on adduct formation with BSA and possibly other serum transport proteins.
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Affiliation(s)
- Marvin W Makinen
- Department of Biochemistry and Molecular Biology, Cummings Life Science Center, The University of Chicago, Illinois 60637, USA.
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