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Deolka S, Govindarajan R, Khaskin E, Vasylevskyi S, Bahri J, Fayzullin RR, Roy MC, Khusnutdinova JR. Oxygen transfer reactivity mediated by nickel perfluoroalkyl complexes using molecular oxygen as a terminal oxidant. Chem Sci 2023; 14:7026-7035. [PMID: 37389265 PMCID: PMC10306096 DOI: 10.1039/d3sc01861j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 06/03/2023] [Indexed: 07/01/2023] Open
Abstract
Nickel perfluoroethyl and perfluoropropyl complexes supported by naphthyridine-type ligands show drastically different aerobic reactivity from their trifluoromethyl analogs resulting in facile oxygen transfer to perfluoroalkyl groups or oxygenation of external organic substrates (phosphines, sulfides, alkenes and alcohols) using O2 or air as a terminal oxidant. Such mild aerobic oxygenation occurs through the formation of spectroscopically detected transient high-valent NiIII and structurally characterized mixed-valent NiII-NiIV intermediates and radical intermediates, resembling O2 activation reported for some Pd dialkyl complexes. This reactivity is in contrast with the aerobic oxidation of naphthyridine-based Ni(CF3)2 complexes resulting in the formation of a stable NiIII product, which is attributed to the effect of greater steric congestion imposed by longer perfluoroalkyl chains.
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Affiliation(s)
- Shubham Deolka
- Coordination Chemistry and Catalysis Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son 904-0495 Okinawa Japan
| | - R Govindarajan
- Coordination Chemistry and Catalysis Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son 904-0495 Okinawa Japan
| | - Eugene Khaskin
- Coordination Chemistry and Catalysis Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son 904-0495 Okinawa Japan
| | - Serhii Vasylevskyi
- Coordination Chemistry and Catalysis Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son 904-0495 Okinawa Japan
| | - Janet Bahri
- Coordination Chemistry and Catalysis Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son 904-0495 Okinawa Japan
| | - Robert R Fayzullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences 8 Arbuzov Street Kazan 420088 Russian Federation
| | - Michael C Roy
- Coordination Chemistry and Catalysis Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son 904-0495 Okinawa Japan
| | - Julia R Khusnutdinova
- Coordination Chemistry and Catalysis Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna-son 904-0495 Okinawa Japan
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2
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Adhikari S, Mukherjee T. Kinetics of Free Radical Reactions of Some Biologically Important Compounds as Studied by Pulse Radiolysis. PROGRESS IN REACTION KINETICS AND MECHANISM 2019. [DOI: 10.3184/007967401103165307] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Soumyakanti Adhikari
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Tulsi Mukherjee
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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3
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Kosobutskii VS. Radiation-initiated dechlorination of organochlorine ecotoxicants. HIGH ENERGY CHEMISTRY 2011. [DOI: 10.1134/s0018143908020021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Cohen LR, Peña LA, Seidl AJ, Chau KN, Keck BC, Feng PL, Hoggard PE. Photocatalytic degradation of chloroform by bis (bipyridine)dichlororuthenium(III/II). J COORD CHEM 2010. [DOI: 10.1080/00958970802702254] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Larissa R. Cohen
- a Department of Chemistry , Santa Clara University , Santa Clara, CA, USA
| | - Laura A. Peña
- a Department of Chemistry , Santa Clara University , Santa Clara, CA, USA
| | - Anton J. Seidl
- a Department of Chemistry , Santa Clara University , Santa Clara, CA, USA
| | - Kimuyen N. Chau
- a Department of Chemistry , Santa Clara University , Santa Clara, CA, USA
| | - Brian C. Keck
- a Department of Chemistry , Santa Clara University , Santa Clara, CA, USA
| | - Patrick L. Feng
- a Department of Chemistry , Santa Clara University , Santa Clara, CA, USA
| | - Patrick E. Hoggard
- a Department of Chemistry , Santa Clara University , Santa Clara, CA, USA
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5
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Gilbert R, Karabulut M, Hoggard PE. Photocatalysis of chloroform degradation by μ-dichlorotetrachlorodipalladate(II). Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.01.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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The photocatalytic decomposition of chloroform by tetrachloroaurate(III). MONATSHEFTE FUR CHEMIE 2009. [DOI: 10.1007/s00706-009-0175-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Alegría AE, Dejesús-Andino FJ, Sanchez-Cruz P. Quinone-enhanced sonochemical production of nitric oxide from s-nitrosoglutathione. ULTRASONICS SONOCHEMISTRY 2009; 16:190-6. [PMID: 18595761 PMCID: PMC2561187 DOI: 10.1016/j.ultsonch.2008.05.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2007] [Revised: 04/18/2008] [Accepted: 05/17/2008] [Indexed: 05/26/2023]
Abstract
Sonolysis at 75 kHz of argon- and air-saturated aqueous solutions at pH 7.4 containing s-nitrosogluthathione (GSNO) enhances the production rate of nitric oxide (NO). The quinones, anthraquinone-2-sulfonate (AQ2S) and anthraquinone-2,7-disulfonate (AQ27S) further enhance the NO production over that produced in quinone-depleted sonicated solutions. In contrast, the hydrophobic quinones juglone (JQ) and 1,4-naphthoquinone (NQ) inhibit ultrasound-induced NO detection as compared to quinone-depleted solutions. Larger sonolytical decomposition of the hydrophobic quinones NQ and JQ, as compared to AQ2S and AQ27S, is detected which correlates with a larger production of pyrolysis-derived carbon-centered radicals. Reaction of those radicals with NO could explain NQ and JQ inhibition. This work suggests that sulfonated quinones could be used to enhance NO release from GSNO in tissues undergoing ultrasound irradiation.
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Affiliation(s)
- Antonio E Alegría
- Department of Chemistry, CUH Station, University of Puerto Rico at Humacao, Humacao, PR 00791.
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8
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Peña LA, Seidl AJ, Cohen LR, Hoggard PE. Ferrocene/ferrocenium ion as a catalyst for the photodecomposition of chloroform. TRANSIT METAL CHEM 2008. [DOI: 10.1007/s11243-008-9169-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Seidl AJ, Cohen LR, Peña LA, Hoggard PE. Chlorochromate ion as a catalyst for the photodegradation of chloroform by visible light. Photochem Photobiol Sci 2008; 7:1373-7. [DOI: 10.1039/b814585g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Muñoz Z, Cohen AS, Nguyen LM, McIntosh TA, Hoggard PE. Photocatalysis by tetraphenylporphyrin of the decomposition of chloroform. Photochem Photobiol Sci 2008; 7:337-43. [DOI: 10.1039/b713270k] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Kosobutskii VS. Structure and reactions of carbon-centered α-oxy(Oxo)Radicals. HIGH ENERGY CHEMISTRY 2006. [DOI: 10.1134/s0018143906050018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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?tefani? I, Asmus KD, Bonifa?i? M. Rate constants for the reaction of halogenated alkylperoxyl radicals with iodide: influence of substituents, solvent polarity, and proton concentration. J PHYS ORG CHEM 2005. [DOI: 10.1002/poc.885] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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Spasojević I, Batinić-Haberle I, Stevens RD, Hambright P, Thorpe AN, Grodkowski J, Neta P, Fridovich I. Manganese(III) biliverdin IX dimethyl ester: a powerful catalytic scavenger of superoxide employing the Mn(III)/Mn(IV) redox couple. Inorg Chem 2001; 40:726-39. [PMID: 11225116 DOI: 10.1021/ic0004986] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A manganese(III) complex of biliverdin IX dimethyl ester, (MnIIIBVDME)2, was prepared and characterized by elemental analysis, UV/vis spectroscopy, cyclic voltammetry, chronocoulometry, electrospray mass spectrometry, freezing-point depression, magnetic susceptibility, and catalytic dismuting of superoxide anion (O2.-). In a dimeric conformation each trivalent manganese is bound to four pyrrolic nitrogens of one biliverdin dimethyl ester molecule and to the enolic oxygen of another molecule. This type of coordination stabilizes the +4 metal oxidation state, whereby the +3/+4 redox cycling of the manganese in aqueous medium was found to be at E1/2 = +0.45 V vs NHE. This potential allows the Mn(III)/Mn(IV) couple to efficiently catalyze the dismutation of O2.- with the catalytic rate constant of kcat = 5.0 x 10(7) M-1 s-1 (concentration calculated per manganese) obtained by cytochrome c assay at pH 7.8 and 25 degrees C. The fifth coordination site of the manganese is occupied by an enolic oxygen, which precludes binding of NO., thus enhancing the specificity of the metal center toward O2.-. For the same reason the (MnIIIBVDME)2 is resistant to attack by H2O2. The compound also proved to be an efficient SOD mimic in vivo, facilitating the aerobic growth of SOD-deficient Escherichia coli.
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Affiliation(s)
- I Spasojević
- Department of Biochemistry and Department of Pediatrics, Duke University Medical Center, Durham, North Carolina 27710, USA
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14
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Pan JX, Wang WF, Lin WZ, Lu CY, Han ZH, Yao SD, Lin NY. Interaction of hydroxycinnamic acid derivatives with the Cl3COO radical: a pulse radiolysis study. Free Radic Res 1999; 30:241-5. [PMID: 10711794 DOI: 10.1080/10715769900300261] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The electron transfer reactions between the trichloromethylperoxyl radical (Cl3COO*) and hydroxycinnamic acid derivatives, including chlorogenic acid, sinapic acid, caffeic acid, ferulic acid and 3,4-(methylenedioxy)cinnamic acid, have been studied by pulse radiolysis. The hydroxycinnamic acid derivatives, especially sinapic acid, are identified as good antioxidants for reduction of Cl3COO* via electron transfer reactions. From buildup kinetic analysis of phenoxyl radical, the rate constant for reaction of Cl3COO* with sinapic acid has been determined to be 8.2x10(7) dm3 mol(-1) s(-1), while the rate constants of electron transfer from other hydroxycinnamic acid derivatives to Cl3COO* were obtained to be about 2x10(7) dm3 mol(-1) s(-1). The reaction of 3,4-(methylenedioxy) cinnamic acid with Cl3COO* was investigated as an evidence for the electron transfer mechanism.
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Affiliation(s)
- J X Pan
- Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, Academia Sinica, PR China
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15
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Berglund J, Pascher T, Winkler JR, Gray HB. Photoinduced Oxidation of Horseradish Peroxidase. J Am Chem Soc 1997. [DOI: 10.1021/ja961026m] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Johan Berglund
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - Torbjörn Pascher
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - Jay R. Winkler
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - Harry B. Gray
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
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16
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Whitten DG, Farahat MS, Gaillard ER. Time-Resolved Fluorescence and Transient Spectroscopy in Determining Photochemical and Photophysical Channels in Reacting Systems in Solutions and Microheterogeneous Media. Photochem Photobiol 1997. [DOI: 10.1111/j.1751-1097.1997.tb01873.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Affiliation(s)
| | - David G. Whitten
- Department of Chemistry, University of Rochester, Rochester, New York 14627
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18
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Photoinduced electron transfer double fragmentation: an oxygen-mediated radical chain process in the co-fragmentation of substituted pinacol donors with carbon tetrachloride. J Photochem Photobiol A Chem 1996. [DOI: 10.1016/1010-6030(95)04237-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Adhikari S, Gopinathan C. Oxidation reactions of a bovine serum albumin-bilirubin complex. A pulse radiolysis study. Int J Radiat Biol 1996; 69:89-98. [PMID: 8601759 DOI: 10.1080/095530096146219] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Using the technique of pulse radiolysis, oxidation studies of the bovine serum albumin-bilirubin (BSA-BR) system with radicals like CCl3OO., N3., (SCN)2.-, Br2.- and OH. generated in neutral and alkaline medium are reported. In a neutral solution, BSA protects the bound BR very efficiently from the attack of these radicals. The experimental k/k' values for the reaction of CCl3OO., N3. and Br2.- radicals are 2.46, 1.78 and 2.55 respectively, where k and k' are the bimolecular rate constants for the formation of the semi-oxidized BSA and BR radicals respectively. The calculated ratios from our measurements of rate constants k and k' are 0.16, 0.28 and 1.38 for CCl3OO., N3. and Br2.- respectively. These values indicate protection of BR by BSA from free radical attack. For Br2.- radical-induced oxidation of the BSA-BR system, a radical transfer from protein to BR was observed. OH. shows very fast adduct formation with both BSA and BR. The bimolecular rate constant for the formation of BR-OH adducts at PH 8+/- 0.2 is 9.5 x 10(9) dm3 mol-1 s-1 (540 nm). OH. adds to BSA at neutral pH with a rate constant of 3.0 +/- 1.0 x 10(10) dm3 mol-1 s-1 (305 nm). In the BSA-BR complex, BSA fully protects BR from OH. attack and the (BSA-BR)-OH adduct further reacts with free BR molecule if present in solution.
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Affiliation(s)
- S Adhikari
- Chemistry Division, Bhabha Atomic Research Centre, Bombay, India
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20
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Aruoma OI, Spencer JP, Butler J, Halliwell B. Reaction of plant-derived and synthetic antioxidants with trichloromethylperoxyl radicals. Free Radic Res 1995; 22:187-90. [PMID: 7704187 DOI: 10.3109/10715769509147538] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- O I Aruoma
- Pharmacology Group, University of London King's College, UK
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21
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Aruoma OI, Halliwell B, Aeschbach R, Löligers J. Antioxidant and pro-oxidant properties of active rosemary constituents: carnosol and carnosic acid. Xenobiotica 1992; 22:257-68. [PMID: 1378672 DOI: 10.3109/00498259209046624] [Citation(s) in RCA: 319] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
1. Carnosol and carnosic acid have been suggested to account for over 90% of the antioxidant properties of rosemary extract. 2. Purified carnosol and carnosic acid are powerful inhibitors of lipid peroxidation in microsomal and liposomal systems, more effective than propyl gallate. 3. Carnosol and carnosic acid are good scavengers of peroxyl radicals (CCl3O2.) generated by pulse radiolysis, with calculated rate constants of 1-3 x 10(6) M-1 s-1 and 2.7 x 10(7) M-1 s-1 respectively. 4. Carnosic acid reacted with HOCl in such a way as to protect the protein alpha 1-antiproteinase against inactivation. 5. Both carnosol and carnosic acid stimulated DNA damage in the bleomycin assay but they scavenged hydroxyl radicals in the deoxyribose assay. The calculated rate constants for reaction with .OH in the deoxyribose system for carnosol and carnosic acid were 8.7 x 10(10) M-1 s-1 and 5.9 x 10(10) M-1 s-1 respectively. 6. Carnosic acid appears to scavenge H2O2, but it could also act as a substrate for the peroxidase system. 7. Carnosic acid and carnosol reduce cytochrome c but with a rate constant significantly lower than that of O2(-.).
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Affiliation(s)
- O I Aruoma
- Biochemistry Department, University of London, King's College, UK
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22
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Abstract
Hemoproteins catalyze reductive and oxidative one-electron transformations. Not infrequently, the radicals produced by these one-electron reactions add to the prosthetic heme group of the enzyme and modify or terminate its catalytic function. Reactions of the radicals with the heme group include additions to the iron atom, pyrrole nitrogens, pyrrole carbons, vinyl groups, and meso carbons. The radicals involved in these reactions derive from the oxidizing agent, the substrate, or the amino acid residues of the catalytic site. The mechanism by which the radicals are generated, their steric and electronic properties, and the extent to which they have access to the heme group determine the nature and regiospecificity of the reaction. The reaction of heme prosthetic groups with radicals is relevant to the inhibition of hemoprotein enzymes, the normal and pathological degradation of heme, and our understanding of hemoprotein function.
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Affiliation(s)
- P R Ortiz de Montellano
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of California, San Francisco 94143-0446
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23
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Mosseri S, Alfassi ZB, Neta P. Absolute rate constants for hydrogen abstraction from hydrocarbons by the trichloromethylperoxyl radical. INT J CHEM KINET 1987. [DOI: 10.1002/kin.550190405] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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24
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Huie RE, Brault D, Neta P. Rate constants for one-electron oxidation by the CF3O2., CCl3O2., and CBr3O2. radicals in aqueous solutions. Chem Biol Interact 1987; 62:227-35. [PMID: 3621370 DOI: 10.1016/0009-2797(87)90024-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The peroxyl radicals CF3O2., CCl3O2. and CBr3O2. were produced by radiolysis of aerated aqueous-alcohol solutions of CF3Br, CF3Cl, CCl4 or CBr4. Kinetic spectrophotometric pulse radiolysis experiments were carried out in the presence of various substrates: urate, ascorbate, xanthine, hydroquinone, p-methoxyphenol, phenol and chlorpromazine. Absolute rate constants for one-electron oxidation of these substrates by the alkylperoxyl radicals were found to vary from less than 10(5) to greater than 10(9) M-1 s-1, depending to some extent on the redox potential of the substrate. For all substrates the order of reactivity was CF3O2. greater than CBr3O2. greater than CCl3O2. . Because of its high reactivity, CF3O2., may have deleterious effects on biological systems. Its likely environmental precursor, CF3Br, which is used as a fire extinguisher and a refrigerant, was found to be reduced by a ferrous porphyrin model for cytochrome P-450 only very slowly and thus is not expected to have a major toxic effect if inhaled.
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26
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HUIE RE, NETA P. Rate constants for one-electron oxidation by methylperoxyl radicals in aqueous solutions. INT J CHEM KINET 1986. [DOI: 10.1002/kin.550181007] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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27
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Brault D, Neta P. Oxidation of FeIII porphyrins by peroxyl radicals derived from 2-propanol and methanol. Evidence for acid-dependent and acid-independent pathways. Chem Phys Lett 1985. [DOI: 10.1016/0009-2614(85)87148-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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28
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Brault D, Neta P, Patterson LK. The lipid peroxidation model for halogenated hydrocarbon toxicity. Kinetics of peroxyl radical processes involving fatty acids and Fe(III) porphyrins. Chem Biol Interact 1985; 54:289-97. [PMID: 2996790 DOI: 10.1016/s0009-2797(85)80170-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The toxicity of halogenated alkanes originates from their metabolism by cytochrome P-450 which leads to the formation of reactive intermediates. In particular, peroxyl radicals derived from the halogenated compounds are believed to induce peroxidative chain degradation of lipids. To examine this hypothesis, radical reactions in a system involving FeIII-deuteroporphyrin as a model of cytochrome P-450, fatty acids or cholesterol, and carbon tetrachloride or the anesthetic agent halothane are studied by means of pulse radiolysis. It is shown that haloperoxyl radicals react with the fatty acids in competition with their reaction with the ferriporphyrin. Moreover, the secondary fatty acid peroxyl radicals also react efficiently with the porphyrin. A model for halogenated alkane toxicity is discussed in terms of these new findings. The importance of local oxygen concentration and structural arrangement of fatty acids around cytochrome P-450 are emphasized.
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