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Chakraborty B, Jana RD, Singh R, Paria S, Paine TK. Reductive Activation of O2 by Non-Heme Iron(II) Benzilate Complexes of N4 Ligands: Effect of Ligand Topology on the Reactivity of O2-Derived Oxidant. Inorg Chem 2016; 56:359-371. [DOI: 10.1021/acs.inorgchem.6b02282] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Biswarup Chakraborty
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Rahul Dev Jana
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Reena Singh
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Sayantan Paria
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Tapan Kanti Paine
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
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Chatterjee S, Paine TK. Olefincis-Dihydroxylation and Aliphatic CH Bond Oxygenation by a Dioxygen-Derived Electrophilic Iron-Oxygen Oxidant. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502229] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chatterjee S, Paine TK. Olefin cis-Dihydroxylation and Aliphatic C-H Bond Oxygenation by a Dioxygen-Derived Electrophilic Iron-Oxygen Oxidant. Angew Chem Int Ed Engl 2015; 54:9338-42. [PMID: 26088714 DOI: 10.1002/anie.201502229] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 04/16/2015] [Indexed: 12/22/2022]
Abstract
Many iron-containing enzymes involve metal-oxygen oxidants to carry out O2-dependent transformation reactions. However, the selective oxidation of C-H and C=C bonds by biomimetic complexes using O2 remains a major challenge in bioinspired catalysis. The reactivity of iron-oxygen oxidants generated from an Fe(II)-benzilate complex of a facial N3 ligand were thus investigated. The complex reacted with O2 to form a nucleophilic oxidant, whereas an electrophilic oxidant, intercepted by external substrates, was generated in the presence of a Lewis acid. Based on the mechanistic studies, a nucleophilic Fe(II)-hydroperoxo species is proposed to form from the benzilate complex, which undergoes heterolytic O-O bond cleavage in the presence of a Lewis acid to generate an Fe(IV)-oxo-hydroxo oxidant. The electrophilic iron-oxygen oxidant selectively oxidizes sulfides to sulfoxides, alkenes to cis-diols, and it hydroxylates the C-H bonds of alkanes, including that of cyclohexane.
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Affiliation(s)
- Sayanti Chatterjee
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata-700032 (India)
| | - Tapan Kanti Paine
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata-700032 (India).
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Ségaud N, Anxolabéhère-Mallart E, Sénéchal-David K, Acosta-Rueda L, Robert M, Banse F. Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O 2 at Fe(ii) centers. Chem Sci 2015; 6:639-647. [PMID: 28936313 PMCID: PMC5588783 DOI: 10.1039/c4sc01891e] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 09/16/2014] [Indexed: 01/15/2023] Open
Abstract
Recent efforts to model the reactivity of iron oxygenases have led to the generation of nonheme FeIII(OOH) and FeIV(O) intermediates from FeII complexes and O2 but using different cofactors. This diversity emphasizes the rich chemistry of nonheme Fe(ii) complexes with dioxygen. We report an original mechanistic study of the reaction of [(TPEN)FeII]2+ with O2 carried out by cyclic voltammetry. From this FeII precursor, reaction intermediates such as [(TPEN)FeIV(O)]2+, [(TPEN)FeIII(OOH)]2+ and [(TPEN)FeIII(OO)]+ have been chemically generated in high yield, and characterized electrochemically. These electrochemical data have been used to analyse and perform simulation of the cyclic voltammograms of [(TPEN)FeII]2+ in the presence of O2. Thus, several important mechanistic informations on this reaction have been obtained. An unfavourable chemical equilibrium between O2 and the FeII complex occurs that leads to the FeIII-peroxo complex upon reduction, similarly to heme enzymes such as P450. However, unlike in heme systems, further reduction of this latter intermediate does not result in O-O bond cleavage.
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Affiliation(s)
- Nathalie Ségaud
- Institut de Chimie Moléculaire et des Matériaux d'Orsay , UMR CNRS 8182 , Université Paris Sud , F-91405 Orsay Cedex , France .
| | - Elodie Anxolabéhère-Mallart
- Laboratoire d'Electrochimie Moléculaire , Université Paris Diderot , Sorbonne Paris Cité , F-75205 PARIS CEDEX 13 , France .
| | - Katell Sénéchal-David
- Institut de Chimie Moléculaire et des Matériaux d'Orsay , UMR CNRS 8182 , Université Paris Sud , F-91405 Orsay Cedex , France .
| | - Laura Acosta-Rueda
- Institut de Chimie Moléculaire et des Matériaux d'Orsay , UMR CNRS 8182 , Université Paris Sud , F-91405 Orsay Cedex , France .
| | - Marc Robert
- Laboratoire d'Electrochimie Moléculaire , Université Paris Diderot , Sorbonne Paris Cité , F-75205 PARIS CEDEX 13 , France .
| | - Frédéric Banse
- Institut de Chimie Moléculaire et des Matériaux d'Orsay , UMR CNRS 8182 , Université Paris Sud , F-91405 Orsay Cedex , France .
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Rammouz G, Lecanu L, Papadopoulos V. Oxidative Stress-Mediated Brain Dehydroepiandrosterone (DHEA) Formation in Alzheimer's Disease Diagnosis. Front Endocrinol (Lausanne) 2011; 2:69. [PMID: 22654823 PMCID: PMC3356139 DOI: 10.3389/fendo.2011.00069] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Accepted: 10/19/2011] [Indexed: 02/06/2023] Open
Abstract
Neurosteroids are steroids made by brain cells independently of peripheral steroidogenic sources. The biosynthesis of most neurosteroids is mediated by proteins and enzymes similar to those identified in the steroidogenic pathway of adrenal and gonadal cells. Dehydroepiandrosterone (DHEA) is a major neurosteroid identified in the brain. Over the years we have reported that, unlike other neurosteroids, DHEA biosynthesis in rat, bovine, and human brain is mediated by an oxidative stress-mediated mechanism, independent of the cytochrome P450 17α-hydroxylase/17,20-lyase (CYP17A1) enzyme activity found in the periphery. This alternative pathway is induced by pro-oxidant agents, such as Fe(2+) and β-amyloid peptide. Neurosteroids are involved in many aspects of brain function, and as such, are involved in various neuropathologies, including Alzheimer's disease (AD). AD is a progressive, yet irreversible neurodegenerative disease for which there are limited means for ante-mortem diagnosis. Using brain tissue specimens from control and AD patients, we provided evidence that DHEA is formed in the AD brain by the oxidative stress-mediated metabolism of an unidentified precursor, thus depleting levels of the precursor in the blood stream. We tested for the presence of this DHEA precursor in human serum using a Fe(2+)-based reaction and determined the amounts of DHEA formed. Fe(2+) treatment of the serum resulted in a dramatic increase in DHEA levels in control patients, whereas only a moderate or no increase was observed in AD patients. The DHEA variation after oxidation correlated with the patients' cognitive and mental status. In this review, we present the cumulative evidence for oxidative stress as a natural regulator of DHEA formation and the use of this concept to develop a blood-based diagnostic tool for neurodegenerative diseases linked to oxidative stress, such as AD.
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Affiliation(s)
- Georges Rammouz
- Department of Medicine, The Research Institute of the McGill University Health Centre, McGill UniversityMontreal, QC, Canada
| | - Laurent Lecanu
- Department of Medicine, The Research Institute of the McGill University Health Centre, McGill UniversityMontreal, QC, Canada
| | - Vassilios Papadopoulos
- Department of Medicine, The Research Institute of the McGill University Health Centre, McGill UniversityMontreal, QC, Canada
- Department of Biochemistry, McGill UniversityMontreal, QC, Canada
- Department of Pharmacology and Therapeutics, McGill UniversityMontreal, QC, Canada
- *Correspondence: Vassilios Papadopoulos, The Research Institute of the McGill University Health Center, Montreal General Hospital, 1650 Cedar Avenue, C10-148, Montreal, QC, Canada H3G 1A4. e-mail:
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Torque C, Sueur B, Cabou J, Bricout H, Hapiot F, Monflier E. Substrate-selective aqueous organometallic catalysis. How small water-soluble organic molecules enhance the supramolecular discrimination. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.03.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sobkowiak A, Naróg D, Sawyer DT. Iron(III, II)-induced activation of dioxygen for the oxygenation of cyclohexene and related unsaturated hydrocarbons. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1381-1169(00)00198-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Cascio C, Prasad VV, Lin YY, Lieberman S, Papadopoulos V. Detection of P450c17-independent pathways for dehydroepiandrosterone (DHEA) biosynthesis in brain glial tumor cells. Proc Natl Acad Sci U S A 1998; 95:2862-7. [PMID: 9501181 PMCID: PMC19660 DOI: 10.1073/pnas.95.6.2862] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Dehydroepiandrosterone (D) is biosynthesized in the brain by a pathway different from that existing in the adrenal cortex. C6 rat glioma tumor cells in culture biosynthesize both pregnenolone (P) and D. They possess the mRNA, protein, and side-chain cleavage activity of P450scc. On the other hand, P450c17 was not detected. Adding FeSO4 to C6 cells increased the synthesis of both P and D. Even in the presence of aminoglutethimide, an inhibitor of P450scc, FeSO4 increased the synthesis of both steroids, indicating that the Fe2+-sensitive process does not involve P450scc. Likewise, the FeSO4-induced formation of D was not blocked by the P450c17 inhibitor, SU-10603. These results suggest that the FeSO4-induced synthesis of D as well as of P in C6 cells may be due to the fragmentation of in situ-formed tertiary hydroperoxides. It is likely, however, that the effect of the Fe2+ is not limited to this one reaction. When exogenous P was added to C6 microsomes, along with FeSO4, the amount of D formed was greater than control values, indicating that Fe2+ facilitated the conversion of P to D. Unlike the constituents that are converted by Fe2+ to P, the precursor of D in C6 cells is not soluble in a 1:1 mixture of ether and ethylacetate. Treatment of C6 cells with KI, NaBH4, or HIO4 resulted in an increase in D synthesis. From this it seems clear that a precursor of the D produced in C6 cells is a steroid where both C-17 and C-20 are oxygenated.
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Affiliation(s)
- C Cascio
- Department of Cell Biology, Georgetown University Medical Center, Washington, DC 20007, USA
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Lindkvist B, Weinander R, Engman L, Koetse M, Engberts JB, Morgenstern R. Glutathione transferase mimics: micellar catalysis of an enzymic reaction. Biochem J 1997; 323 ( Pt 1):39-43. [PMID: 9173899 PMCID: PMC1218312 DOI: 10.1042/bj3230039] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Substances that mimic the enzyme action of glutathione transferases (which serve in detoxification) are described. These micellar catalysts enhance the reaction rate between thiols and activated halogenated nitroarenes as well as alpha,beta-unsaturated carbonyls. The nucleophilic aromatic substitution reaction is enhanced by the following surfactants in descending order: poly(dimethyldiallylammonium - co - dodecylmethyldiallylammonium) bromide (86/14) >>cetyltrimethylammonium bromide>zwittergent 3-16 (n-hexadecyl-N,N-dimethyl-3-ammonio-1-propanesulphonate)>zwittergent+ ++ 3-14 (n-tetradecyl-N,N-dimethyl - 3 - ammonio -1 - propanesulphonate) approximately N,N - dimethyl - laurylamine N-oxide>N,N-dimethyloctylamine N-oxide. The most efficient catalyst studied is a polymeric material that incorporates surfactant properties (n-dodecylmethyldiallylammonium bromide) and opens up possibilities for engineering sequences of reactions on a polymeric support. Michael addition to alpha,beta-unsaturated carbonyls is exemplified by a model substance, trans-4-phenylbut-3-en-2-one, and a toxic compound that is formed during oxidative stress, 4-hydroxy-2-undecenal. The latter compound is conjugated with the highest efficiency of those tested. Micellar catalysts can thus be viewed as simple models for the glutathione transferases highlighting the influence of a positive electrostatic field and a non-specific hydrophobic binding site, pertaining to two catalytic aspects, namely thiolate anion stabilization and solvent shielding.
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Affiliation(s)
- B Lindkvist
- Institute of Environmental Medicine, Division of Toxicology, Karolinska Institutet, Box 210, S-17177 Stockholm
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Sawyer DT, Sobkowiak A, Matsushita T. Metal [MLx; M = Fe, Cu, Co, Mn]/Hydroperoxide-Induced Activation of Dioxygen for the Oxygenation of Hydrocarbons: Oxygenated Fenton Chemistry. Acc Chem Res 1996. [DOI: 10.1021/ar950031c] [Citation(s) in RCA: 258] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Donald T. Sawyer
- Department of Chemistry, Texas A&M University, College Station, Texas 77843
| | - Andrzej Sobkowiak
- Department of Chemistry, Texas A&M University, College Station, Texas 77843
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Hage JP, Schnelten JR, Sawyer DT. The iron(II)/reductant (DH2)-induced activation of dioxygen for the demethylation of N-methylanilines: reaction mimic for the cytochrome P-450/reductase system. Bioorg Med Chem 1996; 4:821-4. [PMID: 8818231 DOI: 10.1016/0968-0896(96)00071-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Several iron(II) complexes [FeIIL+; FeII(DPAH)2 (DPAH2 = 2,6-dicarboxyl pyridine), FeII(PA)2 (PAH = picolinic acid) and FeII(bpy)2(2+)(bpy = 2,2'-bipyridine)] in combination with a reductant [DH2; PhNHNHPh (mimic of dihydroflavin)] catalytically activate O2 (1 atm) for the demethylation of N-methylanilines [PhN(CH3)2, PhNH(CH3)]. This chemistry, which appears to involve a Fenton-like intermediate [LxFeIVOOH(DH) (1c)], mimics that of the cytochrome P-450 monooxygenase/reductase proteins.
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Affiliation(s)
- J P Hage
- Department of Chemistry, Texas A & M University, College Station 77843, USA
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