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Bellotti D, Leveraro S, Remelli M. Metal-protein solution interactions investigated using model systems: Thermodynamic and spectroscopic methods. Methods Enzymol 2023; 687:279-341. [PMID: 37666636 DOI: 10.1016/bs.mie.2023.05.004] [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] [Indexed: 09/06/2023]
Abstract
The first-row D-block metal ions are essential for the physiology of living organisms, functioning as cofactors in metalloproteins or structural components for enzymes: almost half of all proteins require metals to perform the biological function. Understanding metal-protein interactions is crucial to unravel the mysteries behind molecular biology, understanding the effects of metal imbalance and toxicity or the diseases due to disorders in metal homeostasis. Metal-protein interactions are dynamic: they are noncovalent and affected by the environment to which the system is exposed. To reach a complete comprehension of the system, different conditions must be considered for the experimental investigation, in order to get information on the species distribution, the ligand coordination modes, complex stoichiometry and geometry. Thinking about the whole environment where a protein acts, investigations are often challenging, and simplifications are required to study in detail the mechanisms of metal interaction. This chapter is intended to help researchers addressing the problem of the complexity of metal-protein interactions, with particular emphasis on the use of peptides as model systems for the metal coordination site. The thermodynamic and spectroscopic methods most widely employed to investigate the interaction between metal ions and peptides in solution are here covered. These include solid-phase peptide synthesis, potentiometric titrations, calorimetry, electrospray ionization mass spectrometry, UV-Vis spectrophotometry, circular dichroism (CD), nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR). Additional experimental methods, which can be employed to study metal complexes with peptides, are also briefly mentioned. A case-study is finally reported providing a practical example of the investigation of metal-protein interaction by means of thermodynamic and spectroscopic methods applied to peptide model systems.
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Affiliation(s)
- Denise Bellotti
- University of Ferrara, Department of Chemical, Pharmaceutical and Agricultural Sciences, via L. Borsari, Ferrara, Italy; Faculty of Chemistry, University of Wrocław, F. Joliot-Curie, Wrocław, Poland
| | - Silvia Leveraro
- University of Ferrara, Department of Chemical, Pharmaceutical and Agricultural Sciences, via L. Borsari, Ferrara, Italy
| | - Maurizio Remelli
- University of Ferrara, Department of Chemical, Pharmaceutical and Agricultural Sciences, via L. Borsari, Ferrara, Italy.
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2
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Biswas N, Bera S, Sepay N, Pal A, Halder T, Ray S, Acharyya S, Biswas AK, Drew MGB, Ghosh T. Simultaneous formation of non-oxidovanadium(iv) and oxidovanadium(v) complexes incorporating phenol-based hydrazone ligands in aerobic conditions. NEW J CHEM 2020. [DOI: 10.1039/c9nj06114b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A family of non-oxidovanadium(iv) complexes incorporating multidentate hydrazone ligands were synthesized through a thermodynamically unfavourable process along with oxidovanadium(v) species.
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Affiliation(s)
- Nirmalendu Biswas
- Post Graduate Department of Chemistry
- Ramakrishna Mission Vivekananda Centenary College
- Kolkata-700118
- India
| | - Sachinath Bera
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - Nayim Sepay
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - Amrita Pal
- Department of Mechanical Engineering
- National University of Singapore
- Singapore
| | - Tanmoy Halder
- Department of Botany
- University of Calcutta
- Kolkata-700019
- India
| | - Sudipta Ray
- Department of Botany
- University of Calcutta
- Kolkata-700019
- India
| | - Swarnali Acharyya
- Department of Pathology and Cell Biology
- Columbia University
- New York
- USA
| | - Anup Kumar Biswas
- Herbert Irving Comprehensive Cancer Centre
- Columbia University
- New York
- USA
| | | | - Tapas Ghosh
- Post Graduate Department of Chemistry
- Ramakrishna Mission Vivekananda Centenary College
- Kolkata-700118
- India
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3
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Sciortino G, Sanna D, Ugone V, Maréchal JD, Garribba E. Integrated ESI-MS/EPR/computational characterization of the binding of metal species to proteins: vanadium drug–myoglobin application. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00179d] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An integrated strategy based on ESI-MS spectrometry, EPR spectroscopy and docking/QM computational methods is applied to the systems formed by VIVO2+ ions and four potential VIVOL2 drugs and myoglobin. This approach is generizable to other metals and proteins.
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Affiliation(s)
- Giuseppe Sciortino
- Dipartimento di Chimica e Farmacia
- Università di Sassari
- I-07100 Sassari
- Italy
- Departament de Química
| | - Daniele Sanna
- Istituto CNR di Chimica Biomolecolare
- I-07040 Sassari
- Italy
| | - Valeria Ugone
- Dipartimento di Chimica e Farmacia
- Università di Sassari
- I-07100 Sassari
- Italy
| | | | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia
- Università di Sassari
- I-07100 Sassari
- Italy
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4
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Sanna D, Ugone V, Sciortino G, Buglyó P, Bihari Z, Parajdi-Losonczi PL, Garribba E. V IVO complexes with antibacterial quinolone ligands and their interaction with serum proteins. Dalton Trans 2018; 47:2164-2182. [PMID: 29327005 DOI: 10.1039/c7dt04216g] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quinolone derivatives are among the most commonly prescribed antibacterials in the world and could also attract interest as organic ligands in the design of metal complexes with potential pharmacological activity. In this study, five compounds, belonging to the first (nalidixic acid or Hnal), second (ciprofloxacin or Hcip, and norfloxacin or Hnor) and third generation (levofloxacin or Hlev, and sparfloxacin or Hspar) of quinolones, were used as ligands to bind the VIVO2+ ion. In aqueous solution, mono- and bis-chelated species were formed as a function of pH, with cis-[VOHxL2(H2O)]x+ and [VOHxL2]x+, x = 0-2, being the major complexes at pH 7.4. DFT calculations indicate that the most stable isomers are the octahedral OC-6-32 and the square pyramidal SPY-5-12, in equilibrium with each other. To the best of our knowledge, this is the first case that an equilibrium between a penta-coordinated square pyramidal complex and a hexa-coordinated octahedral complex is observed in solution for ligands forming six-membered chelated rings. Nalidixic acid forms the solid compound [VO(nal)2(H2O)], to which a cis-octahedral geometry was assigned. The interaction with 1-methylimidazole (MeIm) causes a shift of the equilibrium SPY-5 + H2O ⇄ OC-6 toward the right after the formation of cis-[VOHxL2(MeIm)]x+, where MeIm replaces an equatorial water ligand. The study of the systems containing [VO(nal)2(H2O)] and the serum proteins - albumin (HSA), apo-transferrin (apo-hTf) and holo-transferrin (holo-hTf) - indicates that HSA and holo-hTf form the mixed species {VO(nal)2}y(HSA) and {VO(nal)2}y(holo-hTf), where y = 1-3 denotes the number of VO(nal)2 moieties bound to accessible histidines (His105, His367, His510 for HSA, and His25, His349, His606 for holo-hTf), whereas apo-hTf yields VO(nal)2(apo-hTf) with the coordination of the His289 residue only. Docking calculations suggest that the specific conformation of apo-hTf and the steric hindrance of the cis-VO(nal)2 moiety interfere with its interaction with all the surface His residues and the formation of a hydrogen bond network which could stabilize the binding sites.
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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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5
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Sanna D, Ugone V, Micera G, Buglyó P, Bíró L, Garribba E. Speciation in human blood of Metvan, a vanadium based potential anti-tumor drug. Dalton Trans 2018. [PMID: 28640312 DOI: 10.1039/c7dt00943g] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The first report on the anti-cancer activity of the compound Metvan, [VIVO(Me2phen)2(SO4)], where Me2phen is 4,7-dimethyl-1,10-phenanthroline, dates back to 2001. Although it was immediately identified as one of the most promising multitargeted anti-cancer V compounds, no development on the medical experimentation was carried out. One of the possible reasons is the lack of information on its speciation in aqueous solution and its thermodynamic stability, factors which influence the transport in the blood and the final form which reaches the target organs. To fill this gap, in this work the speciation of Metvan in aqueous solution and human blood was studied by instrumental (EPR, electronic absorption spectroscopy, ESI-MS and ESI-MS/MS), analytical (pH-potentiometry) and computational (DFT) methods. The results suggested that Metvan transforms at physiological pH into the hydrolytic species cis-[VO(Me2phen)2(OH)]+ and that both citrate and proteins (transferrin and albumin in the blood serum, and hemoglobin in the erythrocytes) form mixed complexes, denoted [VO(Me2phen)(citrH-1)]2- and VO-Me2phen-Protein with the probable binding of His-N donors. The measurements with erythrocytes suggest that Metvan is able to cross their membrane forming mixed species VO-Me2phen-Hb. The redox stability in cell culture medium was also examined, showing that ca. 60% is oxidized to VV after 5 h. Overall, the speciation of Metvan in the blood mainly depends on the V concentration: when it is larger than 50 μM, [VO(Me2phen)(citrH-1)]2- and VO-Me2phen-Protein are the major species, while for concentrations lower than 10 μM, (VO)(hTf) is formed and Me2phen is lost. Therefore, it is plausible that the pharmacological activity of Metvan could be due to the synergic action of free Me2phen, and VIVO and VVO/VVO2 species.
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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, Ugone V, Sciortino G, Parker BF, Zhang Z, Leggett CJ, Arnold J, Rao L, Garribba E. V
IV
O and V
IV
Species Formed in Aqueous Solution by the Tridentate Glutaroimide–Dioxime Ligand – An Instrumental and Computational Characterization. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800090] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare Trav. La Crucca 3 07040 Sassari Italy
| | - Valeria Ugone
- Dipartimento di Chimica e Farmacia Università di Sassari Via Vienna 2 07100 Sassari Italy
| | - Giuseppe Sciortino
- Dipartimento di Chimica e Farmacia Università di Sassari Via Vienna 2 07100 Sassari Italy
- Departament de Química Universitat Autònoma de Barcelona Cerdanyola del Vallés 08193 Barcelona Spain
| | - Bernard F. Parker
- Chemical Sciences Division Lawrence Berkeley National Laboratory 1 Cyclotron Road 94720 Berkeley CA United States
- Department of Chemistry University of California 94720 Berkeley CA United States
| | - Zhicheng Zhang
- Chemical Sciences Division Lawrence Berkeley National Laboratory 1 Cyclotron Road 94720 Berkeley CA United States
| | - Christina J. Leggett
- Chemical Sciences Division Lawrence Berkeley National Laboratory 1 Cyclotron Road 94720 Berkeley CA United States
| | - John Arnold
- Chemical Sciences Division Lawrence Berkeley National Laboratory 1 Cyclotron Road 94720 Berkeley CA United States
- Department of Chemistry University of California 94720 Berkeley CA United States
| | - Linfeng Rao
- Chemical Sciences Division Lawrence Berkeley National Laboratory 1 Cyclotron Road 94720 Berkeley CA United States
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia Università di Sassari Via Vienna 2 07100 Sassari Italy
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7
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Parker BF, Hohloch S, Pankhurst JR, Zhang Z, Love JB, Arnold J, Rao L. Interactions of vanadium(iv) with amidoxime ligands: redox reactivity. Dalton Trans 2018; 47:5695-5702. [PMID: 29632905 DOI: 10.1039/c7dt04069e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The use of amidoxime-functionalized polymer fibers as a sorbent for uranium has attracted recent interest for the extraction of uranium from seawater. Vanadium is one of the main competing ions for uranium sorption as V(v) species, however, vanadium is also present as V(iv) in seawater. In the present study, the interactions of V(iv) with amidoxime and similar ligands were explored. Attempts were made to synthesize V(iv) complexes of glutaroimide-dioxime, a molecular analogue of polymer sorbents. However, V(iv) was found to react irreversibly with glutaroimide-dioxime and other oxime groups, oxidizing to the V(v) oxidation state. We have explored the reactions and propose mechanisms, as well as characterized the redox behavior of the vanadium-glutaroimide-dioxime complex.
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Affiliation(s)
- B F Parker
- Department of Chemistry, University of California - Berkeley, Berkeley, CA 94720, USA.
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8
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Sanna D, Ugone V, Buglyó P, Nagy S, Kacsir I, Garribba E. Speciation in aqueous solution and interaction with low and high molecular mass blood bioligands of [V IV O(oda)(H 2 O) 2 ], a V compound with in vitro anticancer activity. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.07.064] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Sanna D, Serra M, Ugone V, Manca L, Pirastru M, Buglyó P, Bíró L, Micera G, Garribba E. Biorelevant reactions of the potential anti-tumor agent vanadocene dichloride. Metallomics 2017; 8:532-41. [PMID: 27121101 DOI: 10.1039/c6mt00002a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The interaction of the potential anti-tumor agent vanadocene dichloride ([Cp2VCl2] or VDC) with some relevant bioligands of the cytosol such as proteins (Hb), amino acids (glycine and histidine), NADH derivatives (NADH, NADPH, NAD(+) and NADP(+)), reductants (GSH and ascorbic acid), phosphates (HPO4(2-), P2O7(4-), cAMP, AMP, ADP and ATP) and carboxylate derivatives (lactate) and its uptake by red blood cells were studied. The results indicated that [Cp2VCl2] transforms at physiological pH into [Cp2V(OH)2] and that only HPO4(2-), P2O7(4-), lactate, ATP and ADP form mixed species with the [Cp2V](2+) moiety replacing the two hydroxide ions. EPR and electronic absorption spectroscopy, agarose gel electrophoresis and spin trapping measurements allow excluding any direct interaction and/or intercalation with DNA and the formation of reactive oxygen species (ROS) in Fenton-like reactions. Uptake experiments by erythrocytes suggested that VDC crosses the membrane and enters inside the cells, whereas 'bare' V(IV) transforms into V(IV)O species with loss of the two cyclopentadienyl rings. This transformation in the cellular environment could be related to the mechanism of action of VDC.
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Affiliation(s)
- Daniele Sanna
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, UOS di Sassari, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Maria Serra
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, UOS di Sassari, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Valeria Ugone
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy.
| | - Laura Manca
- Dipartimento di Scienze Biomediche, Università di Sassari, Via Muroni 25, I-07100 Sassari, Italy
| | - Monica Pirastru
- Dipartimento di Scienze Biomediche, Università di Sassari, Via Muroni 25, I-07100 Sassari, Italy
| | - Péter Buglyó
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary
| | - Linda Bíró
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary
| | - Giovanni Micera
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy.
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy.
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10
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Biswas N, Patra D, Mondal B, Bera S, Acharyya S, Biswas AK, Mukhopadhyay TK, Pal A, Drew MGB, Ghosh T. Exploring the effect of hydroxylic and non-hydroxylic solvents on the reaction of [V IVO(β-diketonate) 2] with 2-aminobenzoylhydrazide in aerobic and anaerobic conditions. Dalton Trans 2017; 46:10963-10985. [PMID: 28766668 DOI: 10.1039/c7dt01776f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Refluxing [VIVO(β-diketonate)2], namely [VIVO(acetylacetonate)2] and [VIVO(benzoylacetonate)2], separately with an equivalent or excess amount of 2-aminobenzoylhydrazide (ah) in laboratory grade (LG) CH3OH in aerobic conditions afforded non-oxidovanadium(iv) and oxidovanadium(v) complexes of the type [VIV(L1)2] (1), [VVO(L1)(OCH3)]2 (3) and [VIV(L2)2] (2), and [VVO(L2)(OCH3)] (4), respectively. (L1)2- and (L2)2- represent the dianionic forms of 2-aminobenzoylhydrazone of acetylacetone (H2L1) and benzoylacetone (H2L2), respectively, (general abbreviation, H2L), which was formed by the in situ condensation of ah with the respective coordinated [β-diketonate] in medium-to-good yield. The yield of different resulting products was dependent upon the ratio of ah to [VIVO(β-diketonate)2]. For example, the yield of 1 and 2 complexes increased significantly associated with a decrease in the amount of 3 and 4 with an increase in the molar ratio of ah. Upon replacing CH3OH by a non-hydroxylic solvent, LG CHCl3, the above reaction yielded only oxidovanadium(v) complexes of the type [VVO(L1)(OH)]2 (5), [VVO(L2)(OH)] (6) and [VO3(L)2] (7, 8) whereas, upon replacing CHCl3 by another non-hydroxylic solvent, namely LG CH3CN, only the respective [VO3(L)2] (7, 8) complex was isolated in 72-78% yield. However, upon performing the above reactions in the absence of air using dry CH3OH or dry CHCl3, only the respective [VIV(L)2] complex was obtained, suggesting that aerial oxygen was the oxidising agent and the type of pentavalent product formed was dependent upon the nature of solvent used. Complexes 3 and 4 were converted, respectively, to 7 and 8 on refluxing in LG CHCl3via the respective unstable complex 5 and 6. The DFT calculated change in internal energy (ΔE) for the reactions 2[VVO(L2)(OCH3)] + 2H2O → 2[VVO(L2)(OH)] + 2CH3OH and 2[VVO(L2)(OH)] → [VO3(L2)2] + H2O was, respectively, +3.61 and -7.42 kcal mol-1, suggesting that the [VVO(L2)(OH)] species was unstable and readily transformed to the stable [VO3(L2)2] complex. Upon one-electron reduction at an appropriate potential, each of 7 and 8 generated mixed-valence [(L)VVO-(μ-O)-OVIV(L)]- species, which showed valence-delocalisation at room temperature and localisation at 77 K. Some of the complexes showed a wide range of toxicity in a dose-dependent manner against lung cancer cells comparable with that observed with cis-platin.
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Affiliation(s)
- Nirmalendu Biswas
- Postgraduate Department of Chemistry, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata-700118, India.
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11
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Sanna D, Sciortino G, Ugone V, Micera G, Garribba E. Nonoxido V(IV) Complexes: Prediction of the EPR Spectrum and Electronic Structure of Simple Coordination Compounds and Amavadin. Inorg Chem 2016; 55:7373-87. [PMID: 27399275 DOI: 10.1021/acs.inorgchem.6b00409] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Density functional theory (DFT) calculations of the (51)V hyperfine coupling (HFC) tensor A have been completed for 20 "bare" V(IV) complexes with different donor sets, electric charges, and coordination geometries. Calculations were performed with ORCA and Gaussian software, using functionals BP86, TPSS0, B1LYP, PBE0, B3LYP, B3P, B3PW, O3LYP, BHandHLYP, BHandH, and B2PLYP. Among the basis sets, 6-311g(d,p), 6-311++g(d,p), VTZ, cc-pVTZ, def2-TZVPP, and the "core properties" CP(PPP) were tested. The experimental Aiso and Ai (where i = x or z, depending on the geometry and electronic structure of V(IV) complex) were compared with the values calculated by DFT methods. The results indicated that, based on the mean absolute percentage deviation (MAPD), the best functional to predict Aiso or Ai is the double hybrid B2PLYP. With this functional and the basis set VTZ, it is possible to predict the Aiso and Az of the EPR spectrum of amavadin with deviations of -1.1% and -2.0% from the experimental values. The results allowed us to divide the spectra of nonoxido V(IV) compounds in three types-called "type 1", "type 2", and "type 3", characterized by different composition of the singly occupied molecular orbital (SOMO) and relationship between the values of Ax, Ay, and Az. For "type 1" spectra, Az ≫ Ax ≈ Ay and Az is in the range of (135-155) × 10(-4) cm(-1); for "type 2" spectra, Ax ≈ Ay ≫ Az and Ax ≈ Ay are in the range of (90-120) × 10(-4) cm(-1); and for the intermediate spectra of "type 3", Az > Ay > Ax or Ax > Ay > Az, with Az or Ax values in the range of (120-135) × 10(-4) cm(-1). The electronic structure of the V(IV) species was also discussed, and the results showed that the values of Ax or Az are correlated with the percent contribution of V-dxy orbital in the SOMO. Similarly to V(IV)O species, for amavadin the SOMO is based mainly on the V-dxy orbital, and this accounts for the large experimental value of Az (153 × 10(-4) cm(-1)).
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Affiliation(s)
- Daniele Sanna
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, UOS di Sassari, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Giuseppe Sciortino
- Dipartimento di Chimica e Farmacia, Università di Sassari , Via Vienna 2, I-07100 Sassari, Italy
| | - Valeria Ugone
- Dipartimento di Chimica e Farmacia, Università di Sassari , Via Vienna 2, I-07100 Sassari, Italy
| | - Giovanni Micera
- Dipartimento di Chimica e Farmacia, Università di Sassari , Via Vienna 2, I-07100 Sassari, Italy
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia, Università di Sassari , Via Vienna 2, I-07100 Sassari, Italy
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12
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Dash SP, Majumder S, Banerjee A, Carvalho MFNN, Adão P, Pessoa JC, Brzezinski K, Garribba E, Reuter H, Dinda R. Chemistry of Monomeric and Dinuclear Non-Oxido Vanadium(IV) and Oxidovanadium(V) Aroylazine Complexes: Exploring Solution Behavior. Inorg Chem 2016; 55:1165-82. [PMID: 26789655 DOI: 10.1021/acs.inorgchem.5b02346] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A series of mononuclear non-oxido vanadium(IV) [V(IV)(L(1-4))2] (1-4), oxidoethoxido vanadium(V) [V(V)O(L(1-4))(OEt)] (5-8), and dinuclear μ-oxidodioxidodivanadium(V) [V(V)2O3(L(1))2] (9) complexes with tridentate aroylazine ligands are reported [H2L(1) = 2-furoylazine of 2-hydroxy-1-acetonaphthone, H2L(2) = 2-thiophenoylazine of 2-hydroxy-1-acetonaphthone, H2L(3) = 1-naphthoylazine of 2-hydroxy-1-acetonaphthone, H2L(4) = 3-hydroxy-2-naphthoylazine of 2-hydroxy-1-acetonaphthone]. The complexes are characterized by elemental analysis, by various spectroscopic techniques, and by single-crystal X-ray diffraction (for 2, 3, 5, 6, 8, and 9). The non-oxido V(IV) complexes (1-4) are quite stable in open air as well as in solution, and DFT calculations allow predicting EPR and UV-vis spectra and the electronic structure. The solution behavior of the [V(V)O(L(1-4))(OEt)] compounds (5-8) is studied confirming the formation of at least two different types of V(V) species in solution, monomeric corresponding to 5-8, and μ-oxidodioxidodivanadium [V(V)2O3(L(1-4))2] compounds. The μ-oxidodioxidodivanadium compound [V(V)2O3(L(1))2] (9), generated from the corresponding mononuclear complex [V(V)O(L(1))(OEt)] (5), is characterized in solution and in the solid state. The single-crystal X-ray diffraction analyses of the non-oxido vanadium(IV) compounds (2 and 3) show a N2O4 binding set and a trigonal prismatic geometry, and those of the V(V)O complexes 5, 6, and 8 and the μ-oxidodioxidodivanadium(V) (9) reveal that the metal center is in a distorted square pyramidal geometry with O4N binding sets. For the μ-oxidodioxidodivanadium species in equilibrium with 5-8 in CH2Cl2, no mixed-valence complexes are detected by chronocoulometric and EPR studies. However, upon progressive transfer of two electrons, two distinct monomeric V(IV)O species are detected and characterized by EPR spectroscopy and DFT calculations.
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Affiliation(s)
- Subhashree P Dash
- Department of Chemistry, National Institute of Technology , Rourkela 769008, Odisha, India
| | - Sudarshana Majumder
- Department of Chemistry, National Institute of Technology , Rourkela 769008, Odisha, India
| | - Atanu Banerjee
- Department of Chemistry, National Institute of Technology , Rourkela 769008, Odisha, India
| | - M Fernanda N N Carvalho
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Pedro Adão
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - João Costa Pessoa
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Krzysztof Brzezinski
- Institute of Chemistry, University of Bialystok , Hurtowa 1, 5-399 Bialystok, Poland
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia, Università di Sassari , Via Vienna 2, I-07100 Sassari, Italy
| | - Hans Reuter
- Institute of Chemistry of New Materials, University of Osnabrück , Barbarastrasse 7, 49067 Osnabrück, Germany
| | - Rupam Dinda
- Department of Chemistry, National Institute of Technology , Rourkela 769008, Odisha, India
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Sanna D, Ugone V, Micera G, Pivetta T, Valletta E, Garribba E. Speciation of the Potential Antitumor Agent Vanadocene Dichloride in the Blood Plasma and Model Systems. Inorg Chem 2015; 54:8237-50. [DOI: 10.1021/acs.inorgchem.5b01277] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Valeria Ugone
- Dipartimento di Chimica
e Farmacia and 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
| | - Giovanni Micera
- Dipartimento di Chimica
e Farmacia and 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
| | - Tiziana Pivetta
- Dipartimento di Scienze
Chimiche e Geologiche, Università di Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - Elisa Valletta
- Dipartimento di Scienze
Chimiche e Geologiche, Università di Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - Eugenio Garribba
- Dipartimento di Chimica
e Farmacia and 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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Sanna D, Ugone V, Pisano L, Serra M, Micera G, Garribba E. Behavior of the potential antitumor V(IV)O complexes formed by flavonoid ligands. 2. Characterization of sulfonate derivatives of quercetin and morin, interaction with the bioligands of the plasma and preliminary biotransformation studies. J Inorg Biochem 2015; 153:167-177. [PMID: 26281973 DOI: 10.1016/j.jinorgbio.2015.07.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 07/15/2015] [Accepted: 07/27/2015] [Indexed: 01/12/2023]
Abstract
The biotransformation in the plasma and red blood cells of two potential antitumor V(IV)O complexes formed by flavonoid ligands (quercetin or que and morin or mor) and their sulfonic derivatives (quercetin-5'-sulfonic acid or que(S) and morin-5'-sulfonic acid or mor(S)) was studied by spectroscopic (EPR, Electron Paramagnetic Resonance) and computational (DFT, Density Functional Theory) methods. Que and que(S) form with V(IV)O stable complexes, and in the systems with apo-transferrin (apo-hTf) and albumin (HSA) VO(que)2 and VO(que(S))2 remain unchanged. VO(mor)2 and VO(mor(S))2 undergo displacement reactions to give the partial formation of (VO)x(HSA) and (VO)(apo-hTf)/(VO)2(apo-hTf); moreover, mor(S) forms with apo-transferrin and albumin mixed species VO-mor(S)-apo-hTf and VO-mor(S)-HSA. In the systems with apo-hTf and HSA anisotropic EPR spectra at room temperature are detected in which the protein is not directly coordinated to V(IV)O(2+) ion. This is explained assuming that the bis-chelated complexes interact strongly with the proteins through a network of hydrogen bonds with the polar groups present on the protein surface. It is suggested that this "indirect" transport of V(IV)O species could be common to all the species containing ligands which can interact with the blood proteins. Uptake experiments by red blood cells were also carried out, using vanadium concentration of 5.0×10(-4)M and incubation time in the range 0-160min. VO(que)2/VO(que(S))2 and VO(mor)2/VO(mor(S))2 cross the erythrocytes membrane and in the cytosol VO(que)2/VO(que(S))2 do not transform, whereas VO(mor)2/VO(mor(S))2 give the partial formation of mixed species with hemoglobin (Hb) and other V(IV)O complexes.
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Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy.
| | - Valeria Ugone
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
| | - Luisa Pisano
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
| | - Maria Serra
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Giovanni Micera
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy; 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 Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy; 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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Kundu S, Mondal D, Bhattacharya K, Endo A, Sanna D, Garribba E, Chaudhury M. Nonoxido Vanadium(IV) Compounds Involving Dithiocarbazate-Based Tridentate ONS Ligands: Synthesis, Electronic and Molecular Structure, Spectroscopic and Redox Properties. Inorg Chem 2015; 54:6203-15. [DOI: 10.1021/acs.inorgchem.5b00359] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sanchita Kundu
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Dhrubajyoti Mondal
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Kisholoy Bhattacharya
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Akira Endo
- Department
of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
| | - Daniele Sanna
- Istituto CNR di
Chimica
Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Eugenio Garribba
- Dipartimento
di Chimica e Farmacia and 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
| | - Muktimoy Chaudhury
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India
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Sanna D, Fabbri D, Serra M, Buglyó P, Bíró L, Ugone V, Micera G, Garribba E. Characterization and biotransformation in the plasma and red blood cells of V(IV)O(2+) complexes formed by ceftriaxone. J Inorg Biochem 2014; 147:71-84. [PMID: 25601642 DOI: 10.1016/j.jinorgbio.2014.12.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 12/19/2014] [Accepted: 12/19/2014] [Indexed: 11/29/2022]
Abstract
The coordination mode and geometry in aqueous solution of oxidovanadium(IV) complexes formed by a third-generation cephalosporin, ceftriaxone (H3cef), were studied by spectroscopic (EPR, electron paramagnetic resonance), pH-potentiometric and computational (DFT, density functional theory) methods. The behavior of the model systems containing 6-hydroxy-2-methyl-3-thioxo-3,4-dihydro-1,2,4-triazine-5(2H)-one (H2hmtdt) and 3-benzylthio-6-hydroxy-2-methyl-1,2,4-triazine-5(2H)-one (Hbhmt) was examined for comparison. The stability of the tautomers of ceftriaxone and 6-hydroxy-2-methyl-3-thioxo-3,4-dihydro-1,2,4-triazine-5(2H)-one in the neutral, mono- and bi-anionic form was calculated by DFT methods, both in the gas phase and in aqueous solution, and the electron density on the oxygen atoms of the hydroxytriazinone ring was related to the pKa of the ligands. The data demonstrate that ceftriaxone coordinates V(IV)O(2+) forming mono- and bis-chelated complexes with (Oket, O(-)) donor set and formation of five-membered chelate rings. The geometry of the bis-chelated complex, cis-[VO(Hcef)2(H2O)](2-), is cis-octahedral and this species can deprotonate, around physiological pH, to form the corresponding mono-hydroxido cis-[VO(Hcef)2(OH)](3-). The interaction of cis-[VO(Hcef)2(H2O)](2-) with apo-transferrin (apo-hTf) was studied and the results suggest that V(IV)O(2+) distributes between (VO)apo-hTf/(VO)2apo-hTf and cis-[VO(Hcef)2(H2O)](2-), whereas mixed complexes are not formed for charge and steric effects. The interaction of cis-[VO(Hcef)2(H2O)](2-) with red blood cells shows that ceftriaxone helps V(IV)O(2+) ion to cross the erythrocyte membrane. Inside the cell cis-[VO(Hcef)2(H2O)](2-) decomposes and the same species formed by inorganic V(IV)O(2+) are observed. The relationship between the biotransformation in the plasma and red blood cells and the potential pharmacological activity of V(IV)O(2+) species of ceftriaxone is finally discussed.
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Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Davide Fabbri
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Maria Serra
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Péter Buglyó
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary
| | - Linda Bíró
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary
| | - Valeria Ugone
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
| | - Giovanni Micera
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy; 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 Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy; 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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Sanna D, Ugone V, Lubinu G, Micera G, Garribba E. Behavior of the potential antitumor VIVO complexes formed by flavonoid ligands. 1. Coordination modes and geometry in solution and at the physiological pH. J Inorg Biochem 2014; 140:173-84. [DOI: 10.1016/j.jinorgbio.2014.07.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 07/09/2014] [Accepted: 07/10/2014] [Indexed: 12/11/2022]
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Lichawska ME, Bodek KH, Jezierska J, Kufelnicki A. Coordinative interaction of microcrystalline chitosan with oxovanadium (IV) ions in aqueous solution. Chem Cent J 2014; 8:50. [PMID: 25342963 PMCID: PMC4173100 DOI: 10.1186/s13065-014-0050-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Accepted: 07/31/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Chitosan, a non-toxic, biodegradable and biocompatible polysaccharide has attained great interest in pharmaceutical applications, as versatile drug delivery agent. Chitosan has been already shown to serve as vehicle for sustained drug release by chitosan-vanadium(IV) complex from a chitosan gel matrix. Therefore, chitosan gel proved to retain vanadium and preserve its insulin-mimetic efficacy. Nevertheless, there is a lack of reports concerning complexing equilibria in aqueous solution, in particular when using the more advantageous microcrystalline form of chitosan (MCCh). Microcrystalline chitosan shows a number of valuable features as compared with unmodified chitosan. RESULTS Experimental studies on complexing interaction between a special form of biomaterial - microcrystalline chitosan as ligand, L = MCCh, of two exemplary degrees of deacetylation DD (lower 79.8%; higher 97.7%) with M = oxovanadium (IV) ions have been carried out potentiometrically at four ligand-to-metal concentration ratios (2:1, 5:1, 8:1, 10:1). Among the five hydrolysis equilibria of VO(2+) reported up to now in the literature, under the conditions of the present work i.e. aqueous solutions of ionic strength I = 0.1 (KNO3) and temperature 25.0 ± 0.1°C, the predominating one was (VO)2(OH)2 (2+) formation: log β 20-2 = -7.01(2). Analysis of potentiometric results permitted to note that degree of deacetylation does not essentially influence the coordination mode of the complexes formed. In the case of both the two DD values, as well as for all the ligand-to-metal ratios, formation of hydroxyl deprotonated MLH-1 and ML2H-2 moieties has been confirmed potentiometrically (log β 11-1 = -0.68(2) for DD = 79.8% and -0.68(2) for DD = 97.7%, log β 12-2 = -7.64(6) for DD = 79.8% and -5.38(7) for DD = 97.7%). CONCLUSION Microcrystalline chitosan coordinates the vanadyl ions by the hydroxyl groups. Interaction of MCCh with VO(2+) ions in aqueous solution occurs within pH 5-7. Amounts of alkali excessive towards -NH2 are needed to deprotonate the OH groups. Deprotonation occurring at the chitosan hydroxyl groups permits a "pendant" or "bridge" model of coordination with VO(IV). Lack of complexation via deprotonation of amine groups, typical for simple cations and the molybdenum anion, has been indicated also by FTIR spectroscopy and EPR. Graphical AbstractCoordination modes of VO(IV) with microcrystalline chitosan (MCCh): (a)- pendant model, (b)- bridge model.
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Affiliation(s)
- Marta E Lichawska
- Department of Physical and Biocoordination Chemistry, Faculty of Pharmacy, Medical University of Łódź, 90-151 Łódź, Poland
| | - Kazimiera H Bodek
- Chair of Applied Pharmacy, Faculty of Pharmacy, Medical University of Łódź, 90-151 Łódź, Poland
| | - Julia Jezierska
- Faculty of Chemistry, University of Wrocław, 50-383 Wrocław, Poland
| | - Aleksander Kufelnicki
- Department of Physical and Biocoordination Chemistry, Faculty of Pharmacy, Medical University of Łódź, 90-151 Łódź, Poland
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Sanna D, Serra M, Micera G, Garribba E. Uptake of potential anti-diabetic VIVO compounds of picolinate ligands by red blood cells. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.12.038] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Koleša-Dobravc T, Lodyga-Chruscinska E, Symonowicz M, Sanna D, Meden A, Perdih F, Garribba E. Synthesis and characterization of V(IV)O complexes of picolinate and pyrazine derivatives. Behavior in the solid state and aqueous solution and biotransformation in the presence of blood plasma proteins. Inorg Chem 2014; 53:7960-76. [PMID: 25013935 DOI: 10.1021/ic500766t] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Oxidovanadium(IV) complexes with 5-cyanopyridine-2-carboxylic acid (HpicCN), 3,5-difluoropyridine-2-carboxylic acid (HpicFF), 3-hydroxypyridine-2-carboxylic acid (H2hypic), and pyrazine-2-carboxylic acid (Hprz) have been synthesized and characterized in the solid state and aqueous solution through elemental analysis, IR and EPR spectroscopy, potentiometric titrations, and DFT simulations. The crystal structures of the complexes (OC-6-23)-[VO(picCN)2(H2O)]·2H2O (1·2H2O), (OC-6-24)-[VO(picCN)2(H2O)]·4H2O (2·4H2O), (OC-6-24)-Na[VO(Hhypic)3]·H2O (4), and two enantiomers of (OC-6-24)-[VO(prz)2(H2O)] (Λ-5 and Δ-5) have been determined also by X-ray crystallography. 1 presents the first crystallographic evidence for the formation of a OC-6-23 isomer for bis(picolinato) V(IV)O complexes, whereas 2, 4, and 5 possess the more common OC-6-24 arrangement. The strength order of the ligands is H2hypic ≫ HpicCN > Hprz > HpicFF, and this results in a different behavior at pH 7.40. In organic and aqueous solution the three isomers OC-6-23, OC-6-24, and OC-6-42 are formed, and this is confirmed by DFT simulations. In all the systems with apo-transferrin (VO)2(apo-hTf) is the main species in solution, with the hydrolytic V(IV)O species becoming more important with lowering the strength of the ligand. In the systems with albumin, (VO)(x)HSA (x = 5, 6) coexists with VOL2(HSA) and VOL(HSA)(H2O) when L = picCN, prz, with [VO(Hhypic)(hypic)](-), [VO(hypic)2](2-), and [(VO)4(μ-hypic)4(H2O)4] when H2hypic is studied, and with the hydrolytic V(IV)O species when HpicFF is examined. Finally, the consequence of the hydrolysis on the binding of V(IV)O(2+) to the blood proteins, the possible uptake of V species by the cells, and the possible relationship with the insulin-enhancing activity are discussed.
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Affiliation(s)
- Tanja Koleša-Dobravc
- Faculty of Chemistry and Chemical Technology, University of Ljubljana , Aškerčeva cesta 5, SI-1000 Ljubljana, Slovenia , and
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Yoshikawa Y, Sakurai H, Crans DC, Micera G, Garribba E. Structural and redox requirements for the action of anti-diabetic vanadium compounds. Dalton Trans 2014; 43:6965-72. [PMID: 24668346 DOI: 10.1039/c3dt52895b] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study presents the first systematic investigation of the anti-diabetic properties of non-oxido V(IV) complexes. In particular, the insulin-mimetic activity of [V(IV)(taci)2](4+), [V(IV)(inoH-3)2](2-), [V(IV)(dhab)2], [V(IV)(hyph(Ph))2], [V(IV)(cat)3](2-) and [V(IV)(pdbh)2]--where taci is 1,3,5-triamino-1,3,5-trideoxy-cis-inositol, ino is cis-inositol, H2dhab is 2,2'-dihydroxyazobenzene, H2hyph(Ph) is 3,5-bis(2-hydroxyphenyl)-1H-1,2,4-triazole, H2cat is catechol and H2pdbh is pentan-2,4-dione benzoylhydrazone--was evaluated in terms of free fatty acid (FFA) release. Among the six compounds examined, only [V(IV)(pdbh)2], [V(IV)(cat)3](2-) and [V(IV)(hyph(Ph))2], which at the physiological pH convert to the corresponding V(IV)O complexes, were found to exhibit a significant insulin-mimetic activity compared to VOSO4. In contrast, [V(taci)2](4+), [V(inoH-3)2](2-) and [V(dhab)2], which at pH 7.4 keep their 'bare' non-oxido structure, did not cause any inhibition of FFA. The results, therefore, suggest that a V(IV)O functionality is necessary for vanadium complexes to exhibit anti-diabetic effects. This agrees with the notion that the biotransformations of V compounds in the organism are more important than the nature of the species.
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Affiliation(s)
- Yutaka Yoshikawa
- Department of Health, Sports, and Nutrition, Faculty of Health Welfare, Kobe Woman's University, Kobe, Japan
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Sanna D, Serra M, Micera G, Garribba E. Interaction of antidiabetic vanadium compounds with hemoglobin and red blood cells and their distribution between plasma and erythrocytes. Inorg Chem 2014; 53:1449-64. [PMID: 24437949 DOI: 10.1021/ic402366x] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The interaction of V(IV)O(2+) ion with hemoglobin (Hb) was studied with the combined application of spectroscopic (EPR), spectrophotometric (UV-vis), and computational (DFT methods) techniques. Binding of Hb to V(IV)O(2+) in vitro was proved, and three unspecific sites (named α, β, and γ) were characterized, with the probable coordination of His-N, Asp-O(-), and Glu-O(-) donors. The value of log β for (VO)Hb is 10.4, significantly lower than for human serum apo-transferrin (hTf). In the systems with V(IV)O potential antidiabetic compounds, mixed species cis-VOL2(Hb) (L = maltolate (ma), 1,2-dimethyl-3-hydroxy-4(1H)-pyridinonate (dhp)) are observed with equatorial binding of an accessible His residue, whereas no ternary complexes are observed with acetylacetonate (acac). The experiments of uptake of [VO(ma)2], [VO(dhp)2], and [VO(acac)2] by red blood cells indicate that the neutral compounds penetrate the erythrocyte membrane through passive diffusion, and percent amounts higher than 50% are found in the intracellular medium. The biotransformation of [VO(ma)2], [VO(dhp)2], and [VO(acac)2] inside the red blood cells was proved. [VO(dhp)2] transforms quantitatively in cis-VO(dhp)2(Hb), [VO(ma)2] in cis-VO(ma)2(Hb), and cis-VO(ma)2(Cys-S(-)), with the equatorial coordination of a thiolate-S(-) of GSH or of a membrane protein, and [VO(acac)2] in the binary species (VO)xHb and two V(IV)O complexes with formulation VO(L(1),L(2)) and VO(L(3),L(4)), where L(1), L(2), L(3), and L(4) are red blood cell bioligands. The results indicate that, in the studies on the transport of a potential pharmacologically active V species, the interaction with red blood cells and Hb cannot be neglected, that a distribution between the erythrocytes and plasma is achieved, and that these processes can significantly influence the effectiveness of a V drug.
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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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