201
|
Yang X, Bi S, Yang L, Zhu Y, Wang X. Multi-NMR and fluorescence spectra study the effects of aluminum(III) on coenzyme NADH in aqueous solutions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2003; 59:2561-2569. [PMID: 12963452 DOI: 10.1016/s1386-1425(03)00013-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The interactions of dihydronicotinamide adenine dinucleotide (NADH) with Al(III) in near neutral aqueous solutions were studied by means of multinuclear (31P, 27Al, 1H and 13C)-NMR and fluorescence spectra techniques. The results suggested that Al(III) interacts with NADH by occupying the binding sites of pyrophosphate oxygen atoms and locks the adenine moiety of coenzyme in an anti folded conformation Meanwhile, the weak attractive interactions ('association') may occur between Al(III) and the hydroxyl groups of ribose rings through the intramolecular hydrogen bonding. Furthermore, at biologically relevant pH and concentrations of Al(III) and NADH (pH 6.5, C(Al)=10(-6)-10(-5) M), Al(III) could increase the amount of folded forms of NADH, which will result in reducing the coenzyme NADH activity in hollow-dehydrogenases reaction systems. However, in the presence of possible competing organic acids such as citrate, oxalate and tartate, could detoxify these Al(III) toxic effect.
Collapse
Affiliation(s)
- Xiaodi Yang
- Department of Chemistry, State Key Laboratory of Coordination Chemistry, Nanjing University, 22 Hankou Road, Nanjing 210093, PR China
| | | | | | | | | |
Collapse
|
202
|
Ledecq M, Lebon F, Durant F, Giessner-Prettre C, Marquez A, Gresh N. Modeling of Copper(II) Complexes with the SIBFA Polarizable Molecular Mechanics Procedure. Application to a New Class of HIV-1 Protease Inhibitors. J Phys Chem B 2003. [DOI: 10.1021/jp0354604] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marie Ledecq
- Facultés Universitaires Notre-Dame de la Paix, Laboratoire de Chimie Moléculaire Structurale, 61 rue de Bruxelles, 5000 Namur, Belgium, Laboratoire de Chimie Théorique, UMR7615, Université Pierre & Marie Curie, 4, place Jussieu, 75252 Paris, France, Departamento de Qimica Fisica, Facultad de Qimica, Universitad de Sevilla, E-41012 Sevilla, Spain, and Laboratoire de Pharmacochimie Moléculaire et Structurale, FRE 2463 CNRS, U266 INSERM, Université Rene Descartes, 4, avenue de l'Observatoire, 75006 Paris,
| | - Florence Lebon
- Facultés Universitaires Notre-Dame de la Paix, Laboratoire de Chimie Moléculaire Structurale, 61 rue de Bruxelles, 5000 Namur, Belgium, Laboratoire de Chimie Théorique, UMR7615, Université Pierre & Marie Curie, 4, place Jussieu, 75252 Paris, France, Departamento de Qimica Fisica, Facultad de Qimica, Universitad de Sevilla, E-41012 Sevilla, Spain, and Laboratoire de Pharmacochimie Moléculaire et Structurale, FRE 2463 CNRS, U266 INSERM, Université Rene Descartes, 4, avenue de l'Observatoire, 75006 Paris,
| | - François Durant
- Facultés Universitaires Notre-Dame de la Paix, Laboratoire de Chimie Moléculaire Structurale, 61 rue de Bruxelles, 5000 Namur, Belgium, Laboratoire de Chimie Théorique, UMR7615, Université Pierre & Marie Curie, 4, place Jussieu, 75252 Paris, France, Departamento de Qimica Fisica, Facultad de Qimica, Universitad de Sevilla, E-41012 Sevilla, Spain, and Laboratoire de Pharmacochimie Moléculaire et Structurale, FRE 2463 CNRS, U266 INSERM, Université Rene Descartes, 4, avenue de l'Observatoire, 75006 Paris,
| | - Claude Giessner-Prettre
- Facultés Universitaires Notre-Dame de la Paix, Laboratoire de Chimie Moléculaire Structurale, 61 rue de Bruxelles, 5000 Namur, Belgium, Laboratoire de Chimie Théorique, UMR7615, Université Pierre & Marie Curie, 4, place Jussieu, 75252 Paris, France, Departamento de Qimica Fisica, Facultad de Qimica, Universitad de Sevilla, E-41012 Sevilla, Spain, and Laboratoire de Pharmacochimie Moléculaire et Structurale, FRE 2463 CNRS, U266 INSERM, Université Rene Descartes, 4, avenue de l'Observatoire, 75006 Paris,
| | - Antonio Marquez
- Facultés Universitaires Notre-Dame de la Paix, Laboratoire de Chimie Moléculaire Structurale, 61 rue de Bruxelles, 5000 Namur, Belgium, Laboratoire de Chimie Théorique, UMR7615, Université Pierre & Marie Curie, 4, place Jussieu, 75252 Paris, France, Departamento de Qimica Fisica, Facultad de Qimica, Universitad de Sevilla, E-41012 Sevilla, Spain, and Laboratoire de Pharmacochimie Moléculaire et Structurale, FRE 2463 CNRS, U266 INSERM, Université Rene Descartes, 4, avenue de l'Observatoire, 75006 Paris,
| | - Nohad Gresh
- Facultés Universitaires Notre-Dame de la Paix, Laboratoire de Chimie Moléculaire Structurale, 61 rue de Bruxelles, 5000 Namur, Belgium, Laboratoire de Chimie Théorique, UMR7615, Université Pierre & Marie Curie, 4, place Jussieu, 75252 Paris, France, Departamento de Qimica Fisica, Facultad de Qimica, Universitad de Sevilla, E-41012 Sevilla, Spain, and Laboratoire de Pharmacochimie Moléculaire et Structurale, FRE 2463 CNRS, U266 INSERM, Université Rene Descartes, 4, avenue de l'Observatoire, 75006 Paris,
| |
Collapse
|
203
|
Weber TP, Widger WR, Kohn H. Metal-1,4-dithio-2,3-dihydroxybutane chelates: novel inhibitors of the Rho transcription termination factor. Biochemistry 2003; 42:9121-6. [PMID: 12885245 DOI: 10.1021/bi030089w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Rho is an enzyme that is essential for the growth and survival of Escherichia coli, and bicyclomycin (1) is its only known selective inhibitor. We show that metal (Cd(2+), Ni(2+), and Zn(2+)) complexes of 1,4-dithio-2,3-dihydroxybutanes (2) serve as effective and potent rho inhibitors with I(50) values that can exceed that of 1. Maximal inhibition for ZnCl(2) and L-dithiothreitol (2a) corresponded to Zn(2):L-DTT stoichiometry. The I(50) value for the 2:1 Zn-L-DTT solution was 20 microM, which made it 3 times more potent than 1 (I(50) = 60 microM). Kinetic studies showed that a Zn-L-DTT solution functioned as a noncompetitive inhibitor with respect to ATP in the rho poly(C)-dependent ATPase assay and as a competitive inhibitor with respect to ribo(C)(10) in the poly(dC).ribo(C)(10)-stimulated ATPase assay. These findings demonstrated that both 1 and a Zn-L-DTT solution disrupted rho-mediated ATP hydrolysis but that they inhibit using different mechanisms. Substitution of L-DTT with 1,2-ethanedithiol in ZnCl(2) solutions led to a comparable loss of rho poly(C)-dependent ATPase activity, indicating that other metal chelates can serve as efficient inhibitors. The site and pathway of rho inhibition by the putative metal-1,4-dithio-2,3-dihydroxybutane chelates are discussed in light of the current data.
Collapse
Affiliation(s)
- Thomas P Weber
- Department of Chemistry, University of Houston, Houston, Texas 77204-5641, USA
| | | | | |
Collapse
|
206
|
Yang X, Bi S, Wang X, Liu J, Bai Z. Multimethod characterization of the interaction of aluminum ion with alpha-ketoglutaric acid in acidic aqueous solutions. ANAL SCI 2003; 19:273-9. [PMID: 12608759 DOI: 10.2116/analsci.19.273] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
It has recently been reported that aluminum plays a very important role in reducing the activity of Krebs-cycle enzymes and glutamate dehydrogenase in rat brain homogenate. Therefore, it is necessary to identify the aluminum binding ability with the pivotal substrate alpha-ketoglutarate in biological systems. The interactions of aluminum with alpha-ketoglutarate were studied with pH-potentiometry, cyclic voltammetry, UV-vis, 1H, 27Al-NMR and Raman spectra multi-analytical techniques in acidic aqueous solution to measure the stoichiometries and stability constants of the complexes and its keto-enol tautomerism. The alpha-ketoglutarate was found to bind Al in a bidentate manner at the carboxylate and carbonyl moieties. The mononuclear 1:1 (AlLH(-1), AIL+, AlHL2+) and 2:1 (AlL2-, AlL2H(-2)3-) species, and dinuclear 2:1 (Al2L4+) species were found in acidic aqueous solution. Meanwhile, Al can promote alpha-KG tautomerize to its enolic-structure compounds in solutions. These findings may help to further understand the influence of Al on GDH enzyme reactions in biological systems.
Collapse
Affiliation(s)
- Xiaodi Yang
- State Key Laboratory of Coordination Chemistry, Department of Chemistry, Nanjing University, Nanjing 210093, P. R. China
| | | | | | | | | |
Collapse
|
207
|
Lebon F, Boggetto N, Ledecq M, Durant F, Benatallah Z, Sicsic S, Lapouyade R, Kahn O, Mouithys-Mickalad A, Deby-Dupont G, Reboud-Ravaux M. Metal-organic compounds: a new approach for drug discovery. N1-(4-methyl-2-pyridyl)-2,3,6-trimethoxybenzamide copper(II) complex as an inhibitor of human immunodeficiency virus 1 protease. Biochem Pharmacol 2002; 63:1863-73. [PMID: 12034371 DOI: 10.1016/s0006-2952(02)00918-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The use of metal-organic complexes is a potentially fruitful approach for the development of novel enzyme inhibitors. They hold the attractive promise of forming stronger attachments with the target by combining the co-ordination ability of metals with the unique stereoelectronic properties of the ligand. We demonstrated that this approach can be successfully used to inhibit the protease of the human immunodeficiency virus (type 1). Several ligands bearing substituents designed to interact with the catalytic site of the enzyme when complexed to Cu(2+) were synthesised. The inhibition pattern of the resulting copper(II) complexes was analysed. We showed that the copper(II) complex of N1-(4-methyl-2-pyridyl)-2,3,6-trimethoxybenzamide (C1) interacts with the active site of the enzyme leading to competitive inhibition. On the other hand, N2-pyridine-amide ligands and oxazinane carboxamide ligand were found to be poor chelators of the cupric ion under the enzymatic assay conditions. In these cases, the observed inhibition was attributed to released cupric ions which react with cysteine residues on the surface of the protease. While unchelated metal cations are not likely to be useful agents, metal chelates such as C1 should be considered as promising lead compounds for the development of targeted drugs.
Collapse
Affiliation(s)
- Florence Lebon
- Facultés Universitaires Notre-Dame de la Paix, Laboratoire de Chimie Moléculaire Structurale, 61 rue de Bruxelles, 5000 Namur, Belgium
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
208
|
Bottari B, Maccari R, Monforte F, Ottanà R, Vigorita MG, Bruno G, Nicolò F, Rotondo A, Rotondo E. Nickel(II) 2,6-diacetylpyridine bis(isonicotinoylhydrazonate) and bis(benzoylhydrazonate) complexes: structure and antimycobacterial evaluation. Part XI. Bioorg Med Chem 2001; 9:2203-11. [PMID: 11504658 DOI: 10.1016/s0968-0896(01)00133-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The reaction of 2,6-diacetylpyridine (dap) and isonicotinoyl- or benzoylhydrazide leads to bishydrazones H(2)dapin (1a) and H(2)dapb (1b), respectively. The condensation can either take place as a bimolecular kinetic process between the two reactants or as a monomolecular metal-templated synthesis in the presence of nickel(II) ions. In the latter case the reaction products are charged 2,6-diacetylpyridine bis(hydrazone) nickel(II) complexes, which can be easily deprotonated to neutral hydrazonates. Diffractometric analysis of one of these [Ni(dapb)](2) (8b) has shown a binuclear structure with two octahedral nickel(II) ions bridged by two helicoidal dap (bishydrazonates) in a spheroidal structure of C(2V) symmetry. The synthesized complexes 8 are promising as antimycobacterial agents against M. tuberculosis H37Rv. In particular, 8b displays significant activity (MIC=0.025 microg/mL) 10-fold higher than rifampin and equal to isoniazid, while its ligand is ineffective. Compound 8b is also capable of reducing HIV-induced cytopathogenic effect in human T(4 )lymphocytes.
Collapse
Affiliation(s)
- B Bottari
- Dipartimento Farmaco-chimico, Facoltà di Farmacia, Università di Messina, Italy
| | | | | | | | | | | | | | | | | |
Collapse
|
212
|
D'Cruz OJ, Dong Y, Uckun FM. Apoptosis-inducing oxovanadium(IV) complexes of 1,10-phenanthroline against human ovarian cancer. Anticancer Drugs 2000; 11:849-58. [PMID: 11142693 DOI: 10.1097/00001813-200011000-00009] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In a systematic effort to identify a potent anticancer agent against human ovarian cancer, we synthesized 15 oxovanadium(IV) complexes, and examined their cytotoxic activity against human ovarian cancer cell lines PA-1, SKOV-3, ES-2 and OVCAR-3 using a MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyletetrazolium bromide]-based assay. The apoptosis-inducing ability of the oxovanadium compounds was evaluated by the two-color flow cytometric terminal deoxynucleotidyl transferase-based assay that labels 3'-hydroxyl ends of fragmented DNA (TUNEL) assay and confocal laser scanning microscopy. Notably, all eight oxovanadium complexes of 1,10 phenanthroline exhibited significant cytotoxicity and induced apoptosis within 24 h. The mono-chelated, VO(NO2-phen) and bis-chelated, VO(Me2-phen)2, VO(Cl-phen)2 and VO(NO2-phen)2 complexes were the most potent oxovanadium compounds, and killed target cancer cells at low micromolar concentrations. The marked differences in the cytotoxic activity of oxovanadium(IV) complexes containing different heterocyclic ancillary ligands suggest that the cytotoxic activity of these compounds is determined by the identity of the five-member bidentate ligands, as well as the nature of the substituents on the heterocyclic aromatic rings. Our results presented herein provide experimental evidence that oxovanadium compounds induce apoptosis in human ovarian cancer cells. The lead compounds, VO(Me2-phen)2 and VO(NO2-phen)2, may be useful in the treatment of ovarian cancer.
Collapse
Affiliation(s)
- O J D'Cruz
- Department of Reproductive Biology, Parker Hughes Institute, St Paul, MN 55113, USA
| | | | | |
Collapse
|
214
|
Mastrolorenzo A, Scozzafava A, Supuran CT. Antifungal activity of silver and zinc complexes of sulfadrug derivatives incorporating arylsulfonylureido moieties. Eur J Pharm Sci 2000; 11:99-107. [PMID: 10915959 DOI: 10.1016/s0928-0987(00)00093-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two well known antimicrobial sulfonamides, sulfadiazine and sulfamerazine were reacted with arylsulfonyl isocyanates, affording several new arylsulfonylureido derivatives. These compounds were subsequently used as ligands (in the form of conjugate bases, as sulfonamide anions) for the preparation of metal complexes containing silver and zinc. The newly synthesized complexes, unlike the free ligands, proved to act as effective antifungal agents against several Aspergillus and Candida spp., some of them showing activities comparable to ketoconazole, with minimum inhibitory concentrations in the range of 1.5-5 microg/ml. The mechanism of antifungal action of these complexes seems to be different from that of the azole antifungals acting as lanosterol-14-alpha-demethylase inhibitors. Levels of sterols assayed in the fungi cultures treated with these new antifungals were equal in the absence or in the presence of the tested compounds. This is in strong contrast with similar experiments in which ketoconazole has been used as antifungal, when drastically reduced ergosterol amounts could be detected. Thus, it is probable that the inhibition of phosphomannose isomerase, a key enzyme in the biosynthesis of yeast cell walls, imparts antifungal activity to the new metal complexes reported here.
Collapse
Affiliation(s)
- A Mastrolorenzo
- Università degli Studi, Dipartimento di Scienze Dermatologiche, Centro MTS, Via degli Alfani 37, 50122, Firenze, Italy.
| | | | | |
Collapse
|