1
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da Silva VB, Mahy JP, Brazzolotto X, Renard PY, Ricoux R, Legros J. Detoxification of V-Nerve Agents Assisted by a Microperoxidase: New Pathway Revealed by the Use of a Relevant VX Simulant. Chembiochem 2024; 25:e202400137. [PMID: 38591336 DOI: 10.1002/cbic.202400137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 04/08/2024] [Accepted: 04/08/2024] [Indexed: 04/10/2024]
Abstract
The biocatalyzed oxidative detoxification of the V-series simulant PhX, by mean of the microperoxidase AcMP11, affords the corresponding phosphonothioate as the prominent product instead of the classical P-S and P-O bond cleavage. While PhX is structurally very close to the live agent VX (the methyl group is replaced by a phenyl), assessment with other surrogates missing the nucleophilic amino function displayed more resistance under the same conditions with no phosphonothioate observed. These encouraging results highlight 1) the efficacy of AcMP11 microperoxidase to efficiently detoxify V-series organophosphorus nerve agents (OPNA), and 2) the necessity to use representative alkyl or aryl phosphonothioates simulants such as PhX bearing the appropriate side chain as well as the P-O and P-S cleavable bond to mimic accurately the V-series OPNA to prevent false positive or false negative results.
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Affiliation(s)
| | - Jean-Pierre Mahy
- Université Paris-Saclay, CNRS, Institut de Chimie Moléculaire et des Matériaux d'Orsay, 91400, Orsay, France
| | - Xavier Brazzolotto
- Département de Toxicologie et Risques Chimiques, Institut de Recherche Biomédicale des Armées, 91220, Brétigny-sur-Orge, France
| | - Pierre-Yves Renard
- Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ, COBRA, F-76000, Rouen, France
| | - Rémy Ricoux
- Université Paris-Saclay, CNRS, Institut de Chimie Moléculaire et des Matériaux d'Orsay, 91400, Orsay, France
| | - Julien Legros
- Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ, COBRA, F-76000, Rouen, France
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2
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Marques HM. The inorganic chemistry of the cobalt corrinoids - an update. J Inorg Biochem 2023; 242:112154. [PMID: 36871417 DOI: 10.1016/j.jinorgbio.2023.112154] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Revised: 01/23/2023] [Accepted: 01/26/2023] [Indexed: 02/05/2023]
Abstract
The inorganic chemistry of the cobalt corrinoids, derivatives of vitamin B12, is reviewed, with particular emphasis on equilibrium constants for, and kinetics of, their axial ligand substitution reactions. The role the corrin ligand plays in controlling and modifying the properties of the metal ion is emphasised. Other aspects of the chemistry of these compounds, including their structure, corrinoid complexes with metals other than cobalt, the redox chemistry of the cobalt corrinoids and their chemical redox reactions, and their photochemistry are discussed. Their role as catalysts in non-biological reactions and aspects of their organometallic chemistry are briefly mentioned. Particular mention is made of the role that computational methods - and especially DFT calculations - have played in developing our understanding of the inorganic chemistry of these compounds. A brief overview of the biological chemistry of the B12-dependent enzymes is also given for the reader's convenience.
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Affiliation(s)
- Helder M Marques
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa.
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3
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Yan J, Li Z, Liu M, Sun X, Ma L, Wang Z, Zhao Z, Huang X, Yuan L. Activity adaptability of a DhHP-6 peroxidase-mimic in wide pH and temperature ranges and solvent media. Catal Sci Technol 2020. [DOI: 10.1039/c9cy01855g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deuterohemin-β-Ala-His-Thr-Val-Glu-Lys (DhHp-6): peroxidase with high activity.
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Affiliation(s)
- Jiaqing Yan
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
- China
| | - Zhengqiang Li
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
- China
| | - Min Liu
- Hospital of Stomatology
- Jilin University
- Changchun
- China
| | - Xiaoli Sun
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- China
| | - Li Ma
- Department of Physics
- Georgia Southern University
- Statesboro
- USA
| | - Zhi Wang
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
- China
| | - Zijian Zhao
- Institute of Agro-food Technology
- Jilin Academy of Agricultural Sciences
- Changchun
- China
| | - Xuri Huang
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- China
| | - Long Yuan
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
- College of Physics
- Jilin Normal University
- Changchun 130103
- China
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4
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Gkaniatsou E, Serre C, Mahy JP, Steunou N, Ricoux R, Sicard C. Enhancing microperoxidase activity and selectivity: immobilization in metal-organic frameworks. J PORPHYR PHTHALOCYA 2019. [DOI: 10.1142/s1088424619300106] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Microperoxidases 8 (MP8) and 11 (MP11) are heme-containing peptides obtained by the proteolytic digestion of Cytochrome c. They act as mini-enzymes that combine both peroxidase-like and Cytochrome P450-like activities that may be useful in the synthesis of fine chemicals or in the degradation of environmental pollutants. However, their use is limited by their instability in solution due to (i) the bleaching of the heme in the presence of an excess of H2O2, (ii) the decoordination of the distal histidine ligand of the iron under acidic conditions and, (iii) their tendency to aggregate in aqueous alkaline solutions, even at low concentrations. Additionally, both MP8 and MP11 show relatively low selectivity, due to the lack of control of the substrates by a specific catalytic pocket on the distal face of the heme. Both stability and selectivity issues can be effectively addressed by immobilization of microperoxidases in solid matrices, which can also lead to their possible recycling from the reaction medium. Considering their relatively small size, the pore inclusion of MPs into Metal-Organic Frameworks appeared to be more adequate compared to other immobilization methods that have been widely investigated for decades. The present minireview describes the catalytic activities of MP8 and MP11, their limitations, and various results describing their immobilization into MOFs which led to MP11- or MP8@MOF hybrid materials that display good activity in the oxidation of dyes and phenol derivatives, with remarkable recyclability due to the stabilization of the MPs inside the MOF cavities. An example of selective oxidation of dyes according to their charge by MP8@MOF hybrid materials is also highlighted.
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Affiliation(s)
- Effrosyni Gkaniatsou
- Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, 45 Avenue des Etat-Unis, Versailles, France
| | - Christian Serre
- Institut des Matériaux Poreux de Paris, UMR-8004 CNRS-ENS-ESPCI, PSL Research University, 75005, Paris, France
| | - Jean-Pierre Mahy
- Laboratoire de Chimie Bioorganique et Bioinorganique, Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182, Université Paris Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Nathalie Steunou
- Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, 45 Avenue des Etat-Unis, Versailles, France
| | - Rémy Ricoux
- Laboratoire de Chimie Bioorganique et Bioinorganique, Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182, Université Paris Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Clémence Sicard
- Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, 45 Avenue des Etat-Unis, Versailles, France
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5
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Gkaniatsou E, Sicard C, Ricoux R, Benahmed L, Bourdreux F, Zhang Q, Serre C, Mahy J, Steunou N. Enzyme Encapsulation in Mesoporous Metal–Organic Frameworks for Selective Biodegradation of Harmful Dye Molecules. Angew Chem Int Ed Engl 2018; 57:16141-16146. [DOI: 10.1002/anie.201811327] [Citation(s) in RCA: 89] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Indexed: 01/29/2023]
Affiliation(s)
- Effrosyni Gkaniatsou
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
| | - Clémence Sicard
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
| | - Rémy Ricoux
- Laboratoire de Chimie Bioorganique et BioinorganiqueInstitut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182Université Paris Sud, Université Paris-Saclay Orsay France
| | - Linda Benahmed
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
| | - Flavien Bourdreux
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
| | - Qi Zhang
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
- Current address: Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of Technology Guangzhou 510006 China
| | - Christian Serre
- Institut des Matériaux Poreux de ParisFRE 2000 CNRS Ecole Normale SupérieureEcole Supérieure de Physique et de Chimie Industrielles de ParisPSL research university Paris France
| | - Jean‐Pierre Mahy
- Laboratoire de Chimie Bioorganique et BioinorganiqueInstitut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182Université Paris Sud, Université Paris-Saclay Orsay France
| | - Nathalie Steunou
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
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6
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7
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Gkaniatsou E, Sicard C, Ricoux R, Benahmed L, Bourdreux F, Zhang Q, Serre C, Mahy J, Steunou N. Enzyme Encapsulation in Mesoporous Metal–Organic Frameworks for Selective Biodegradation of Harmful Dye Molecules. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811327] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Effrosyni Gkaniatsou
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
| | - Clémence Sicard
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
| | - Rémy Ricoux
- Laboratoire de Chimie Bioorganique et BioinorganiqueInstitut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182Université Paris Sud, Université Paris-Saclay Orsay France
| | - Linda Benahmed
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
| | - Flavien Bourdreux
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
| | - Qi Zhang
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
- Current address: Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of Technology Guangzhou 510006 China
| | - Christian Serre
- Institut des Matériaux Poreux de ParisFRE 2000 CNRS Ecole Normale SupérieureEcole Supérieure de Physique et de Chimie Industrielles de ParisPSL research university Paris France
| | - Jean‐Pierre Mahy
- Laboratoire de Chimie Bioorganique et BioinorganiqueInstitut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182Université Paris Sud, Université Paris-Saclay Orsay France
| | - Nathalie Steunou
- Institut Lavoisier de Versailles, UVSQ, CNRSUniversité Paris-Saclay 45 avenue des Etat-Unis Versailles France
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8
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Reductive nitrosylation of ferric microperoxidase-11. J Biol Inorg Chem 2018; 24:21-29. [PMID: 30390140 DOI: 10.1007/s00775-018-1623-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 10/08/2018] [Indexed: 10/28/2022]
Abstract
Microperoxidase-11 (MP11) is an undecapeptide derived from horse heart cytochrome c, which is considered as a heme-protein model. Here, the reductive nitrosylation of ferric MP11 (MP11(III)) under anaerobic conditions has been investigated between pH 7.4 and 9.2, at T = 20.0 °C. At pH ≤ 7.7, NO binds reversibly to MP11(III) leading to the formation of the MP11(III)-NO complex. However, between pH 8.2 and 9.2, the addition of NO to MP11(III) leads to the formation of ferrous nitrosylated MP11(II) (MP11(II)-NO). In fact, the transient MP11{FeNO}6 species is converted to ferrous deoxygenated MP11 (MP11(II)) by OH-- and H2O-based catalysis, which represents the rate-limiting step of the whole reaction. Then, MP11(II) binds NO very rapidly leading to MP11(II)-NO formation. Over the whole pH range explored, the apparent values of kon, koff, and K (= koff/kon) for MP11(III)(-NO) (de)nitrosylation are essentially pH independent, ranging between 5.8 × 105 M-1 s-1 and 1.6 × 106 M-1 s-1, between 1.9 s-1 and 3.7 s-1, and between 1.4 × 10-6 M and 4.6 × 10-6 M, respectively. Values of the apparent pseudo-first-order rate constant for the MP11{FeNO}6 conversion to MP11(II) (i.e., h) increase linearly with pH; the apparent values [Formula: see text] and [Formula: see text] are 7.2 × 102 M-1 s-1 and 2.5 × 10-4 s-1, respectively. Present data confirm that MP11 is a useful molecular model to highlight the role of the protein matrix on the heme-based reactivity.
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9
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Prieto T, Santana V, Britto AMM, Araujo-Chaves JC, R Nascimento O, L Nantes-Cardoso I. Structure and Catalysis of Fe(III) and Cu(II) Microperoxidase-11 Interacting with the Positively Charged Interfaces of Lipids. Molecules 2017; 22:molecules22081212. [PMID: 28933729 PMCID: PMC6151982 DOI: 10.3390/molecules22081212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Revised: 06/20/2017] [Accepted: 07/14/2017] [Indexed: 11/24/2022] Open
Abstract
Numerous applications have been described for microperoxidases (MPs) such as in photoreceptors, sensing, drugs, and hydrogen evolution. The last application was obtained by replacing Fe(III), the native central metal, by cobalt ion and inspired part of the present study. Here, the Fe(III) of MP-11 was replaced by Cu(II) that is also a stable redox state in aerated medium, and the structure and activity of both MPs were modulated by the interaction with the positively charged interfaces of lipids. Comparative spectroscopic characterization of Fe(III) and Cu(II)MP-11 in the studied media demonstrated the presence of high and low spin species with axial distortion. The association of the Fe(III)MP-11 with CTAB and Cu(II)MP-11 with DODAB affected the colloidal stability of the surfactants that was recovered by heating. This result is consistent with hydrophobic interactions of MPs with DODAB vesicles and CTAB micelles. The hydrophobic interactions decreased the heme accessibility to substrates and the Fe(III) MP-11catalytic efficiency. Cu(II)MP-11 challenged by peroxides exhibited a cyclic Cu(II)/Cu(I) interconversion mechanism that is suggestive of a mimetic Cu/ZnSOD (superoxide dismutase) activity against peroxides. Hydrogen peroxide-activated Cu(II)MP-11 converted Amplex Red® to dihydroresofurin. This study opens more possibilities for technological applications of MPs.
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Affiliation(s)
- Tatiana Prieto
- Universidade Federal do ABC, Santo André 09210-170, SP, Brazil.
| | - Vinicius Santana
- Universidade de São Paulo, Instituto de Física de São Carlos, São Carlos 13400-970, SP, Brazil.
| | | | | | - Otaciro R Nascimento
- Universidade de São Paulo, Instituto de Física de São Carlos, São Carlos 13400-970, SP, Brazil.
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10
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Galardon E, Huguet F, Herrero C, Ricoux R, Artaud I, Padovani D. Reactions of persulfides with the heme cofactor of oxidized myoglobin and microperoxidase 11: reduction or coordination. Dalton Trans 2017; 46:7939-7946. [DOI: 10.1039/c7dt01638g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Persulfides reduce both met- and ferryl-oxidized forms of myoglobin, and coordinate to N-acetylated microperoxidase-11.
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Affiliation(s)
- Erwan Galardon
- UMR 8601
- LCBPT
- CNRS-Université Paris Descartes
- 75006 Paris
- France
| | - Florian Huguet
- UMR 8601
- LCBPT
- CNRS-Université Paris Descartes
- 75006 Paris
- France
| | - Christian Herrero
- UMR 8182
- ICMMO
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- Université Paris-Sud
- 91405 Orsay Cedex
| | - Rémy Ricoux
- UMR 8182
- ICMMO
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- Université Paris-Sud
- 91405 Orsay Cedex
| | - Isabelle Artaud
- UMR 8601
- LCBPT
- CNRS-Université Paris Descartes
- 75006 Paris
- France
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11
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Kleingardner EC, Asher WB, Bren KL. Efficient and Flexible Preparation of Biosynthetic Microperoxidases. Biochemistry 2016; 56:143-148. [DOI: 10.1021/acs.biochem.6b00915] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Erin C. Kleingardner
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Wesley B. Asher
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Kara L. Bren
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
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12
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Lee T, Kim J, Park J, Pak Y, Kim H, Lim M. Rebinding dynamics of NO to microperoxidase-8 probed by time-resolved vibrational spectroscopy. Phys Chem Chem Phys 2016; 18:5192-202. [PMID: 26813691 DOI: 10.1039/c5cp06336a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Femtosecond vibrational spectroscopy was used to probe the rebinding kinetics of NO to microperoxidase-8 (Mp), an ideal model system for the active site of ligand-binding heme proteins, including myoglobin and hemoglobin, after the photodeligation of MpNO in glycerol/water (G/W) solutions at 294 K. The geminate rebinding (GR) of NO to Mp in viscous solutions was highly efficient and ultrafast and negligibly dependent on the solution viscosity, which was adjusted by changing the glycerol content from 65% to 90% by volume in G/W mixtures. The kinetics of the GR of NO to Mp in viscous solutions was well represented by an exponential function with a time constant of ca. 11 ps. Although the kinetic traces of the GR of NO to Mp in solutions with three different viscosities (18, 81, and 252 cP) almost overlap, they show a slight difference early in the decay process. The kinetic traces were also described by the diffusion-controlled reaction theory with a Coulomb potential. Since the ligand is deligated in a neutral form, an ionic pair of NO(-) and Mp(+) may be produced before forming the Mp-NO bond by an electron transfer from Mp to NO as the deligated NO is sufficiently near to the Fe atom of Mp. The strong reactivity between NO and ferrous heme may arise from the Coulomb interaction between the reacting pair, which is consistent with the harpooning mechanism for NO binding to heme.
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Affiliation(s)
- Taegon Lee
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, 46241 Korea.
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13
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Mahy JP, Maréchal JD, Ricoux R. Various strategies for obtaining oxidative artificial hemoproteins with a catalytic oxidative activity: from "Hemoabzymes" to "Hemozymes"? J PORPHYR PHTHALOCYA 2015. [DOI: 10.1142/s1088424614500813] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The design of artificial hemoproteins that could lead to new biocatalysts for selective oxidation reactions using clean oxidants such as O 2 or H 2 O 2 under ecocompatible conditions constitutes a really promising challenge for a wide range of industrial applications. In vivo, such reactions are performed by heme-thiolate proteins, cytochromes P450, that catalyze the oxidation of drugs by dioxygen in the presence of electrons delivered from NADPH by cytochrome P450 reductase. Several strategies were used to design new artificial hemoproteins to mimic these enzymes, that associate synthetic metalloporphyrin derivatives to a protein that is supposed to induce a selectivity in the catalyzed reaction. A first generation of artificial hemoproteins or "hemoabzymes" was obtained by the non-covalent association of synthetic hemes such as N-methyl-mesoporphyrin IX, Fe(III) -α3β-tetra-o-carboxyphenylporphyrin or microperoxidase 8 with monoclonal antibodies raised against these cofactors. The obtained antibody-metalloporphyrin complexes displayed a peroxidase activity and some of them catalyzed the regio-selective nitration of phenols by H 2 O 2/ NO 2 and the stereo-selective oxidation of sulphides by H 2 O 2. A second generation of artificial hemoproteins or "hemozymes", was obtained by the non-covalent association of non-relevant proteins with metalloporphyrin derivatives. Several strategies were used, the most successful of which, named "host-guest" strategy involved the non-covalent incorporation of metalloporphyrin derivatives into easily affordable proteins. The artificial hemoproteins obtained were found to be able to perform efficiently the stereoselective oxidation of organic compounds such as sulphides and alkenes by H 2 O 2 and KHSO 5.
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Affiliation(s)
- Jean-Pierre Mahy
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS, Laboratoire de Chimie, Bioorganique et Bioinorganique, Bât. 420, Université Paris-sud, 91405 Orsay Cedex, France
| | - Jean-Didier Maréchal
- Departament de Química, Universitat Autònoma de Barcelona, Edifici C.n., 08193 Cerdonyola del Vallès, Barcelona, Spain
| | - Rémy Ricoux
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS, Laboratoire de Chimie, Bioorganique et Bioinorganique, Bât. 420, Université Paris-sud, 91405 Orsay Cedex, France
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14
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Mahy JP, Maréchal JD, Ricoux R. From “hemoabzymes” to “hemozymes”: towards new biocatalysts for selective oxidations. Chem Commun (Camb) 2015; 51:2476-94. [DOI: 10.1039/c4cc08169b] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Two generations of artificial hemoproteins have been obtained: “hemoabzymes”, by non-covalent association of synthetic hemes with monoclonal antibodies raised against these cofactors and “hemozymes”, by non-covalent association of non-relevant proteins with metalloporphyrin derivatives. A review of the different strategies employed as well as their structural and catalytic properties is presented here.
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Affiliation(s)
- J.-P. Mahy
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- UMR 8182 CNRS
- Laboratoire de Chimie Bioorganique et Bioinorganique
- 91435 Orsay Cedex
- France
| | - J.-D. Maréchal
- Departament de Química
- Universitat Autònoma de Barcelona
- Barcelona
- Spain
| | - R. Ricoux
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- UMR 8182 CNRS
- Laboratoire de Chimie Bioorganique et Bioinorganique
- 91435 Orsay Cedex
- France
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15
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Zipp CF, Michael JP, Fernandes MA, Mathura S, Perry CB, Navizet I, Govender PP, Marques HM. The Synthesis of a Corrole Analogue of Aquacobalamin (Vitamin B12a) and Its Ligand Substitution Reactions. Inorg Chem 2014; 53:4418-29. [DOI: 10.1021/ic5000793] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Caitlin F. Zipp
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050 South Africa
| | - Joseph P. Michael
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050 South Africa
| | - Manuel A. Fernandes
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050 South Africa
| | - Sadhna Mathura
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050 South Africa
| | - Christopher B. Perry
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050 South Africa
| | - Isabelle Navizet
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050 South Africa
| | - Penny P. Govender
- Department
of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg, 2028 South Africa
| | - Helder M. Marques
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050 South Africa
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16
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Yeh HC, Lin WY. Enhancement of Chemiluminescence from the Oxidation of Luminol with Hydrogen Peroxide Catalyzed by Mn(III)-Microperoxidase 8. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200300011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Mathura S, Sannasy D, de Sousa AS, Perry CB, Navizet I, Marques HM. The preparation of N-acetyl-Co(III)-microperoxidase-8 (NAcCoMP8) and its ligand substitution reactions: A comparison with aquacobalamin (vitamin B12a). J Inorg Biochem 2013; 123:66-79. [DOI: 10.1016/j.jinorgbio.2013.03.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 03/01/2013] [Accepted: 03/04/2013] [Indexed: 12/01/2022]
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18
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Vincelli AJ, Pottinger DS, Zhong F, Hanske J, Rolland SG, Conradt B, Pletneva EV. Recombinant expression, biophysical characterization, and cardiolipin-induced changes of two Caenorhabditis elegans cytochrome c proteins. Biochemistry 2013; 52:653-66. [PMID: 23282202 DOI: 10.1021/bi3014938] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Cytochrome c (cyt c) is one of the most widely studied biomolecules, but not much is known about this protein from nematodes. Recombinant expression of Caenorhabditis elegans CYC-2.1 and CYC-2.2 allowed for detailed characterization of their structural features, redox properties, stabilities, and interactions with cardiolipin (CL)-containing liposomes. Using a variety of spectroscopic tools, we show that CYC-2.1 and CYC-2.2 adopt a globular α-helical fold with His/Met heme ligation. The longer CYC-2.2 has a lower thermodynamic stability than CYC-2.1 and lacks His residues to misligate to the heme in the protein's denatured state. Both C. elegans proteins bind to CL-containing liposomes, and these interactions promote the proteins' peroxidase activity but to a much greater degree for CYC-2.2. Dye-to-heme distance distributions from time-resolved fluorescence resonance energy transfer in bimane-labeled CYC-2.1 and CYC-2.2 revealed similar populations of extended and compact conformers for CL-bound proteins, suggesting that their distinct peroxidase activities in the presence of CL arise from differences in the local heme environments for the two polypeptide ensembles. Without inhibition from His misligation, a less stable and more prone to unfolding CYC-2.2 allows for better access of substrates to the heme and thus exhibits higher peroxidase activity. Similar features of the conformational ensembles of CYC-2.1 and CYC-2.2 to those of mammalian cyt c suggest that C. elegans proteins, particularly the former, could serve as useful models for examining the mechanism of cyt c-CL interactions in live organisms.
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Affiliation(s)
- Amber J Vincelli
- Department of Chemistry, Dartmouth College, Hanover, NH 03755, USA
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19
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Kim J, Park J, Lee T, Lim M. Dynamics of Geminate Rebinding of NO with Cytochrome c in Aqueous Solution Using Femtosecond Vibrational Spectroscopy. J Phys Chem B 2012; 116:13663-71. [PMID: 23113639 DOI: 10.1021/jp308468j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Jooyoung Kim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735,
Korea
| | - Jaeheung Park
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735,
Korea
| | - Taegon Lee
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735,
Korea
| | - Manho Lim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735,
Korea
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20
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PEGylation of deuterohaemin-alanine-histidine-threonine-valine-glutamic acid-lysine and its influence on activity, stability, and aggregation. J Appl Polym Sci 2012. [DOI: 10.1002/app.38220] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Everse J, Liu CJJ, Coates PW. Physical and catalytic properties of a peroxidase derived from cytochrome c. Biochim Biophys Acta Mol Basis Dis 2011; 1812:1138-45. [PMID: 21620967 DOI: 10.1016/j.bbadis.2011.05.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 04/18/2011] [Accepted: 05/06/2011] [Indexed: 01/04/2023]
Abstract
Except for its redox properties, cytochrome c is an inert protein. However, dissociation of the bond between methionine-80 and the heme iron converts the cytochrome into a peroxidase. Dissociation is accomplished by subjecting the cytochrome to various conditions, including proteolysis and hydrogen peroxide (H(2)O(2))-mediated oxidation. In affected cells of various neurological diseases, including Parkinson's disease, cytochrome c is released from the mitochondrial membrane and enters the cytosol. In the cytosol cytochrome c is exposed to cellular proteases and to H(2)O(2) produced by dysfunctional mitochondria and activated microglial cells. These could promote the formation of the peroxidase form of cytochrome c. In this study we investigated the catalytic and cytolytic properties of the peroxidase form of cytochrome c. These properties are qualitatively similar to those of other heme-containing peroxidases. Dopamine as well as sulfhydryl group-containing metabolites, including reduced glutathione and coenzyme A, are readily oxidized in the presence of H(2)O(2). This peroxidase also has cytolytic properties similar to myeloperoxidase, lactoperoxidase, and horseradish peroxidase. Cytolysis is inhibited by various reducing agents, including dopamine. Our data show that the peroxidase form of cytochrome c has catalytic and cytolytic properties that could account for at least some of the damage that leads to neuronal death in the parkinsonian brain.
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Affiliation(s)
- Johannes Everse
- Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA.
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22
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Astuti Y, Topoglidis E, Durrant JR. Use of microperoxidase-11 to functionalize tin dioxide electrodes for the optical and electrochemical sensing of hydrogen peroxide. Anal Chim Acta 2011; 686:126-32. [DOI: 10.1016/j.aca.2010.11.045] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Revised: 11/17/2010] [Accepted: 11/22/2010] [Indexed: 11/15/2022]
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23
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O'Reilly NJ, Magner E. The effect of solvent on the catalytic properties of microperoxidase-11. Phys Chem Chem Phys 2011; 13:5304-13. [DOI: 10.1039/c0cp02321c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Park J, Lee T, Lim M. Viscosity-Dependent Dynamics of CO Rebinding to Microperoxidase-8 in Glycerol/Water Solution. J Phys Chem B 2010; 114:10897-904. [DOI: 10.1021/jp1050436] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Jaeheung Park
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, 609-735 Korea
| | - Taegon Lee
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, 609-735 Korea
| | - Manho Lim
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, 609-735 Korea
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25
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Verbaro D, Hagarman A, Kohli A, Schweitzer-Stenner R. Microperoxidase 11: a model system for porphyrin networks and heme–protein interactions. J Biol Inorg Chem 2009; 14:1289-300. [DOI: 10.1007/s00775-009-0574-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Accepted: 07/15/2009] [Indexed: 11/30/2022]
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26
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Marboutin L, Desbois A, Berthomieu C. Low-Frequency Heme, Iron-Ligand, and Ligand Modes of Imidazole and Imidazolate Complexes of Iron Protoporphyrin and Microperoxidase in Aqueous Solution. An Analysis by Far-Infrared Difference Spectroscopy. J Phys Chem B 2009; 113:4492-9. [DOI: 10.1021/jp810774g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Laure Marboutin
- Laboratoire des Interactions Protéine Métal, SBVME/iBEB/DSV, CEA-Cadarache, UMR 6191 CNRS CEA Université Aix-Marseille II, Bât 185, 13108 Saint-Paul-lez-Durance Cedex, France, and Laboratoire Stress Oxydant et Détoxication, SB2SM and CNRS URA 2096/iBiTec-S/DSV, CEA-Saclay, 91191 Gif-sur-Yvette cedex, France
| | - Alain Desbois
- Laboratoire des Interactions Protéine Métal, SBVME/iBEB/DSV, CEA-Cadarache, UMR 6191 CNRS CEA Université Aix-Marseille II, Bât 185, 13108 Saint-Paul-lez-Durance Cedex, France, and Laboratoire Stress Oxydant et Détoxication, SB2SM and CNRS URA 2096/iBiTec-S/DSV, CEA-Saclay, 91191 Gif-sur-Yvette cedex, France
| | - Catherine Berthomieu
- Laboratoire des Interactions Protéine Métal, SBVME/iBEB/DSV, CEA-Cadarache, UMR 6191 CNRS CEA Université Aix-Marseille II, Bât 185, 13108 Saint-Paul-lez-Durance Cedex, France, and Laboratoire Stress Oxydant et Détoxication, SB2SM and CNRS URA 2096/iBiTec-S/DSV, CEA-Saclay, 91191 Gif-sur-Yvette cedex, France
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27
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Kim J, Park J, Lee T, Lim M. Dynamics of Ultrafast Rebinding of CO to Carboxymethyl Cytochrome c. J Phys Chem B 2008; 113:260-6. [DOI: 10.1021/jp804656t] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Jooyoung Kim
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, 609-735 Korea
| | - Jaeheung Park
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, 609-735 Korea
| | - Taegon Lee
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, 609-735 Korea
| | - Manho Lim
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, 609-735 Korea
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28
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Behera S, Raj CR. Electrochemistry of surface wired redox protein: Axial ligation and control of redox potential. J Electroanal Chem (Lausanne) 2008. [DOI: 10.1016/j.jelechem.2008.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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29
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Korri-Youssoufi H, Desbenoit N, Ricoux R, Mahy JP, Lecomte S. Elaboration of a new hydrogen peroxide biosensor using microperoxidase 8 (MP8) immobilized on a polypyrrole coated electrode. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2008. [DOI: 10.1016/j.msec.2007.10.062] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Abstract
Femtosecond vibrational spectroscopy was used to probe a functionally important dynamics and residual structure of myoglobin unfolded by 4 M guanidine HCl. The spectra of the dissociated CO indicated that the residual structure of unfolded myoglobin (Mb) forms a few hydrophobic cavities that could accommodate the dissociated ligand. Geminate rebinding (GR) of CO to the unfolded Mb is three-orders-of-magnitude faster and more efficient than the native Mb but similar to a model heme in a viscous solvent, suggesting that the GR of CO to heme is accelerated by the longer retention of the dissociated ligand near the Fe atom by the poorly-structured protein matrix of the unfolded Mb or viscous solvent. The inefficient GR of CO in native Mb, while dissociated CO is trapped in the primary heme pocket located near the active binding site, indicates that the tertiary structure of the pocket in native Mb plays a functionally significant role.
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31
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Ricoux R, Dubuc R, Dupont C, Marechal JD, Martin A, Sellier M, Mahy JP. Hemozymes Peroxidase Activity Of Artificial Hemoproteins Constructed From the Streptomyces lividans Xylanase A and Iron(III)-Carboxy-Substituted Porphyrins. Bioconjug Chem 2008; 19:899-910. [DOI: 10.1021/bc700435a] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rémy Ricoux
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182 CNRS, Laboratoire de Chimie Bioorganique et Bioinorganique, Bât. 420, Université Paris XI, 91405 Orsay Cedex, France, Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec, H7V 1B7, Canada, and Unitat de Química Física, Departament de Química, Universitat Autònoma de Barcelona, Edifici C.n., 08193 Cerdonyola (Barcelona), Spain
| | - Roger Dubuc
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182 CNRS, Laboratoire de Chimie Bioorganique et Bioinorganique, Bât. 420, Université Paris XI, 91405 Orsay Cedex, France, Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec, H7V 1B7, Canada, and Unitat de Química Física, Departament de Química, Universitat Autònoma de Barcelona, Edifici C.n., 08193 Cerdonyola (Barcelona), Spain
| | - Claude Dupont
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182 CNRS, Laboratoire de Chimie Bioorganique et Bioinorganique, Bât. 420, Université Paris XI, 91405 Orsay Cedex, France, Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec, H7V 1B7, Canada, and Unitat de Química Física, Departament de Química, Universitat Autònoma de Barcelona, Edifici C.n., 08193 Cerdonyola (Barcelona), Spain
| | - Jean-Didier Marechal
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182 CNRS, Laboratoire de Chimie Bioorganique et Bioinorganique, Bât. 420, Université Paris XI, 91405 Orsay Cedex, France, Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec, H7V 1B7, Canada, and Unitat de Química Física, Departament de Química, Universitat Autònoma de Barcelona, Edifici C.n., 08193 Cerdonyola (Barcelona), Spain
| | - Aurore Martin
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182 CNRS, Laboratoire de Chimie Bioorganique et Bioinorganique, Bât. 420, Université Paris XI, 91405 Orsay Cedex, France, Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec, H7V 1B7, Canada, and Unitat de Química Física, Departament de Química, Universitat Autònoma de Barcelona, Edifici C.n., 08193 Cerdonyola (Barcelona), Spain
| | - Marion Sellier
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182 CNRS, Laboratoire de Chimie Bioorganique et Bioinorganique, Bât. 420, Université Paris XI, 91405 Orsay Cedex, France, Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec, H7V 1B7, Canada, and Unitat de Química Física, Departament de Química, Universitat Autònoma de Barcelona, Edifici C.n., 08193 Cerdonyola (Barcelona), Spain
| | - Jean-Pierre Mahy
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, UMR 8182 CNRS, Laboratoire de Chimie Bioorganique et Bioinorganique, Bât. 420, Université Paris XI, 91405 Orsay Cedex, France, Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec, H7V 1B7, Canada, and Unitat de Química Física, Departament de Química, Universitat Autònoma de Barcelona, Edifici C.n., 08193 Cerdonyola (Barcelona), Spain
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32
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O’Donoghue D, Magner E. The electrochemical response of microperoxidase in non-aqueous solvents. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.04.117] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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33
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Behera S, Raj CR. Mercaptoethylpyrazine promoted electrochemistry of redox protein and amperometric biosensing of uric acid. Biosens Bioelectron 2007; 23:556-61. [PMID: 17719217 DOI: 10.1016/j.bios.2007.06.012] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2007] [Accepted: 06/15/2007] [Indexed: 11/16/2022]
Abstract
Electrochemistry of microperoxidase-11 (MPx-11) anchored on the mixed self-assembled monolayer (SAM) of 2-(2-mercaptoethylpyrazine) (PET) and 4,4'-dithiodibutyric acid (DTB) on gold (Au) electrode and the biosensing of uric acid (UA) is described. MPx-11 has been covalently anchored on the mixed SAM of PET and DTB on Au electrode. MPx-11 on the mixed self-assembly exhibits reversible redox response characteristic of a surface confined species. The heterocyclic ring of PET promotes the electron transfer between the electrode and the redox protein. The apparent standard rate constant kapps obtained for the redox reaction of MPx-11 on the mixed monolayer is approximately 2.15 times higher than that on the single monolayer of DTB modified electrode. MPx-11 efficiently mediates the electrocatalytic reduction of H2O2. MPx-11 electrode is highly sensitive to H2O2 and it shows linear response for a wide concentration range. The electrocatalytic activity of the MPx-11 electrode is combined with the enzymatic activity of uricase (UOx) to fabricate uric acid biosensor. The bienzyme assembly is highly sensitive towards UA and it could detect UA as low as 2 microM at the potential of -0.1 V. The biosensor shows linear response with a sensitivity of 3.4+/-0.08 nA cm(-2) microM(-1). Ascorbate (AA) and paracetamol (PA) do not significantly interfere in the amperometric sensing of UA.
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Affiliation(s)
- S Behera
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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34
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Marques HM. Insights into porphyrin chemistry provided by the microperoxidases, the haempeptides derived from cytochrome c. Dalton Trans 2007:4371-85. [PMID: 17909648 DOI: 10.1039/b710940g] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The water-soluble haem-containing peptides obtained by proteolytic digestion of cytochrome c, the microperoxidases, have been used to explore aspects of the chemistry of iron porphyrins, and as mimics for some reactions catalysed by the haemoproteins, including the reactions catalysed by the peroxidases and the cytochromes P450. The preparation of the microperoxidases, their physical and chemical properties including their electronic structure, the kinetics and thermodynamics of their reactions with ligands, electrochemical studies and examples of their uses as haemoproteins mimics, is reviewed.
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Affiliation(s)
- Helder M Marques
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa.
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35
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36
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Nicolis S, Casella L, Roncone R, Dallacosta C, Monzani E. Heme-peptide complexes as peroxidase models. CR CHIM 2007. [DOI: 10.1016/j.crci.2006.09.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Marboutin L, Boussac A, Berthomieu C. Redox infrared markers of the heme and axial ligands in microperoxidase: bases for the analysis of c-type cytochromes. J Biol Inorg Chem 2006; 11:811-23. [PMID: 16783544 DOI: 10.1007/s00775-006-0119-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2006] [Accepted: 05/08/2006] [Indexed: 10/24/2022]
Abstract
Structural changes accompanying the change in the redox state of microperoxidase-8 (MP8), the heme-octapeptide obtained from cytochrome c, and its complexes with (methyl)imidazole ligands were studied by electrochemically induced Fourier transform IR (FTIR) difference spectroscopy. To correlate with confidence IR modes with a specific electronic state of the iron, we used UV-vis and electron paramagnetic resonance spectroscopy to define precisely the heme spin state in the samples at the millimolar concentration of MP8 required for FTIR difference spectroscopy. We identified four intense redox-sensitive IR heme markers, nu38 at 1,569 cm(-1) (ox)/1,554 cm(-1) (red), nu42 at 1,264 cm(-1) (ox)/1,242 cm(-1) (red), nu43 at 1,146 cm(-1) (ox), and nu44 at 1,124-1,128 cm(-1) (ox). The intensity of nu42 and nu43 was clearly enhanced for low-spin imidazole-MP8 complexes, while that of nu44 increased for high-spin MP8. These modes can thus be used as IR markers of the iron spin state in MP8 and related c-type cytochromes. Moreover, one redox-sensitive band at 1,044 cm(-1) (red) is attributed to an IR marker specific of c-type hemes, possibly the delta(CbH3)(2,4) heme mode. Other redox-sensitive IR bands were assigned to the MP8 peptide backbone and to the fifth and sixth axial heme ligands. The distinct IR frequencies for imidazole (1,075 cm(-1)) and histidine (1,105 cm(-1)) side chains in the imidazole-MP8 complex allowed us to provide the first direct determination of their pKa at pH 9 and 12, respectively.
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Affiliation(s)
- Laure Marboutin
- Laboratoire des Interactions Protéine Métal, DEVM-DSV, UMR 6191, CNRS CEA Université Aix-Marseille II, CEA-Cadarache, 13108, Saint Paul-lez-Durance Cedex, France
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38
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Prieto T, Marcon RO, Prado FM, Caires ACF, Di Mascio P, Brochsztain S, Nascimento OR, Nantes IL. Reaction route control by microperoxidase-9/CTAB micelle ratios. Phys Chem Chem Phys 2006; 8:1963-73. [PMID: 16633684 DOI: 10.1039/b601671e] [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: 11/21/2022]
Abstract
Microperoxidases (MP) as water-soluble models attract interest to studying the reaction mechanism of peroxidases because these heme peptides are able to form the same enzyme intermediates during the reaction with peroxides. In this work we have demonstrated that the association of Fe(III)MP-9 and Fe(III)MP-11 with CTAB micelles (MP-9/CTAB and MP11/CTAB) provides a microenvironment with an alkaline interface and a hydrophobic core that exhibits peroxidase behavior. This microenvironment shifts positively the redox potential of microperoxidases by approximately 100 mV. tert-Butylhydroperoxide (t-BuOOH) when added to the medium, converted Fe(III)MP-9/CTAB to MP-9/CTAB Compound II, a high valence oxidized intermediate of the heme peptide. Subsequent addition of diphenylacetaldehyde (DPAA) to MP-9/CTAB Compound II regenerated the native form of the enzyme, Fe(III)MP-9/CTAB, what characterizes the occurrence of a peroxidase cycle. Fe(III)MP-9/CTAB regenerated during the peroxidase cycle reacted with residual DPAA in the medium to form Fe(II)MP-9/CTAB, which indicates that both Fe(III)MP-9/CTAB and its oxyferryl form can use aldehydes as reducing agents. According to the determined reduction potential, Fe(III)MP-9 and Fe(III)MP-9/CTAB should be able to oxidize DPAA (reduction potential -630 mV). The reaction of MP-9/CTAB with DPAA produced benzophenone as final product, detected by infrared spectroscopy and mass spectrometry. Interestingly, a significant difference was observed in the benzophenone yield according to the micelle/MP-9 molar ratio.
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Affiliation(s)
- Tatiana Prieto
- Centro Interdisciplinar de Investigação Bioquímica-CIIB Universidade de Mogi das Cruzes-UMC, Mogi das Cruzes, SP, Brazil
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De Sanctis G, Fasciglione GF, Marini S, Sinibaldi F, Santucci R, Monzani E, Dallacosta C, Casella L, Coletta M. pH-dependent redox and CO binding properties of chelated protoheme-l-histidine and protoheme-glycyl-l-histidine complexes. J Biol Inorg Chem 2005; 11:153-67. [PMID: 16341900 DOI: 10.1007/s00775-005-0060-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2005] [Accepted: 11/04/2005] [Indexed: 10/25/2022]
Abstract
The pH dependence of redox properties, spectroscopic features and CO binding kinetics for the chelated protohemin-6(7)-L-histidine methyl ester (heme-H) and the chelated protohemin-6(7)-glycyl-L-histidine methyl ester (heme-GH) systems has been investigated between pH 2.0 and 12.0. The two heme systems appear to be modulated by four protonating groups, tentatively identified as coordinated H(2)O, one of heme's propionates, N(epsilon) of the coordinating imidazole, and the carboxylate of the histidine residue upon hydrolysis of the methyl ester group (in acid medium). The pK (a) values are different for the two hemes, thus reflecting structural differences. In particular, the different strain at the Fe-N(epsilon) bond, related to the different length of the coordinating arm, results in a dramatic alteration of the bond strength, which is much smaller in heme-H than in heme-GH. It leads to a variation in the variation of the pKa for the protonation of the N(epsilon) of the axial imidazole as well as in the proton-linked behavior of the other protonating groups, envisaging a cross-talk communication mechanism among different groups of the heme, which can be operative and relevant also in the presence of the protein matrix.
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Affiliation(s)
- Giampiero De Sanctis
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Via F. Camerini 2, 62032 Camerino, Italy
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40
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Abstract
The pH dependence of the peroxidase activity (guaiacol assay) of the ferric hemeoctapeptide N-acetylmicroperoxidase-8 (N-AcMP8) was studied under conditions where formation of the Compound I analogue of the peroxidase enzymes is rate limiting. The pH profile of the reaction rate is consistent with a mechanism where both H2O2 and HO2- can displace H2O coordinated trans to neutral His but where the hydroxo complex of the hemepeptide (OH- trans to His) is kinetically inert. At pH > 11, where the proximal His ligand of Fe(III) ionizes to form a histidinate, the hydroxo complex (OH- trans to His-) becomes kinetically labile. A comparison of DeltaH(double dagger) and DeltaS(double dagger) values for the reaction of H2O2 and HO2-, obtained from the temperature dependence of the rate constants, with values for CN- and cysteine reported previously, shows that the activation parameters depend on the identity of the incoming ligand. This suggests that ligand substitution at Fe(III) in N-AcMP8 proceeds through an interchange mechanism.
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Affiliation(s)
- Helder M Marques
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050 South Africa.
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41
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Caputi L, Di Tullio A, Di Leandro L, De Angelis F, Malatesta F. A new microperoxidase from Marinobacter hydrocarbonoclasticus. Biochim Biophys Acta Gen Subj 2005; 1725:71-80. [PMID: 15987663 DOI: 10.1016/j.bbagen.2005.05.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2004] [Revised: 05/14/2005] [Accepted: 05/23/2005] [Indexed: 11/26/2022]
Abstract
The preparation and characterization of a new microperoxidase obtained from proteinase K-treated cytochrome c(552) from Marinobacter hydrocarbonoclasticus (previously known as Pseudomonas nautica) are presented. This microperoxidase (MMP-5) has novel structural properties relative to previously reported microperoxidases, as the two intervening amino acid (X) residues within the consensual CXXCH c-type heme binding motif are missing, yielding a heme-pentapeptide with increased solubility in aqueous solvents and a 1-2 order of magnitude higher stability of the monomeric state relative to canonical microperoxidases. The electronic spectra in the near-UV and visible regions have been studied as a function of MMP-5 concentration and pH. The spectroscopic properties of MMP-5 are typical of microperoxidases with high-spin hexa- or pentacoordinate heme species dominant in the 1-8 pH range and low-spin states prevailing at higher pH values. In the presence of hydrogen peroxide, MMP-5 displays peroxidatic activities towards several compounds.
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Affiliation(s)
- Lorenzo Caputi
- Department of Pure and Applied Biology, University of L'Aquila, L'Aquila, Italy
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42
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Vashi PR, Marques HM. The coordination of imidazole and substituted pyridines by the hemeoctapeptide N-acetyl-ferromicroperoxidase-8 (FeIINAcMP8). J Inorg Biochem 2005; 98:1471-82. [PMID: 15337599 DOI: 10.1016/j.jinorgbio.2004.05.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2004] [Revised: 05/11/2004] [Accepted: 05/18/2004] [Indexed: 11/23/2022]
Abstract
The N-terminus acetylated ferric hemeoctapeptide from cytochrome c, N-acetylmicroperoxidase-8 (Fe(III)-NAcMP8) can be reduced by dithionite in aqueous solution to produce Fe(II)-NAcMP8. The UV-Vis spectrum has a broad Soret band and relatively poorly defined Q bands which is consistent with a mixture of a five-coordinate high spin species with His as the axial ligand and a six-coordinate, predominantly high spin species with His/H(2)O as axial ligands. There are two spectroscopically observable pK(a)s at 8.7+/-0.1 and 10.9+/-0.2 which are attributed to ionization of a heme propionic acid group and coordinated H(2)O, respectively; a pK(a) > or = 14 is due to ionization of the proximal His ligand. Equilibrium constants were determined by UV-Vis spectrophotometry at 25.0+/-0.2 degrees C and 0.5 M ionic strength (NaClO(4)) for the coordination of imidazole and a number of substituted pyridines, and complement available data for the ferric hemepeptide, allowing a comparison to be made of the affinity of an iron porphyrin with Fe in the +2 and +3 oxidation states towards these ligands. Imidazole is coordinated more strongly by the ferric porphyrin (log K=4.08) than by the ferrous porphyrin (log K=3.40). The equilibrium constants for coordination of pyridines by the ferric and ferrous porphyrins increase and decrease, respectively, with increasing ligand basicity. Values determined by cyclic voltammetry show the same dependence on the identity of the ligand. In the ferric porphyrin, the stability of the complex increases with the basicity of the ligand and hence its ability to donate electron density onto the metal. In the case of the more electron rich ferrous porphyrin, greater stability occurs with pyridine ligands that have an electron withdrawing group and hence can accept electron density from the metal. This is consistent with the midpoint reduction potentials E(1/2) of the pyridine complexes determined by cyclic voltammetry; E(1/2) is linearly dependent on, and becomes more negative with an increase in, ligand basicity. Log K for coordination of pyridines by the ferrous hemepeptide correlates well with the energy of the ligand frontier orbital with pi symmetry, suggesting that pi-bonding effects are significant in determining the strength of binding of pyridines by a ferrous porphyrin.
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Affiliation(s)
- Preeti R Vashi
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, Johannesburg 2050, South Africa
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43
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Everse J, Coates PW. Role of peroxidases in Parkinson disease: a hypothesis. Free Radic Biol Med 2005; 38:1296-310. [PMID: 15855048 DOI: 10.1016/j.freeradbiomed.2005.01.018] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2004] [Revised: 01/10/2005] [Accepted: 01/20/2005] [Indexed: 11/19/2022]
Abstract
Extensive research has been done to elucidate the underlying molecular events causing neurodegenerative diseases such as Parkinson disease, yet the cause and the individual steps in the progression of such diseases are still unknown. Here we advance the hypothesis that, rather than or in addition to inorganic radical molecules, heme-containing peroxidase enzymes may play a major role in the etiology of Parkinson disease. This hypothesis is based on the following considerations: (1) several heme-containing enzymes with peroxidase activity are present in the substantia nigra pars compacta; (2) these peroxidases have the ability to catalyze the oxidation of proteins and lipids; (3) certain heme peroxidases are known to destroy cells in vivo; (4) heme peroxidases have the stability and specificity that could account for the fact that specific molecules and cells are subject to damage in Parkinson disease, rather than a random destruction; (5) heme peroxidase activity could account for certain reactions in connection with parkinsonism that thus far have not been adequately explained; and (6) the participation of a heme peroxidase could explain some recent observations that are inconsistent with the oxyradical theory. The peroxidase-catalyzed oxidative pathway proposed here does not preclude the participation of apoptosis as an additional mechanism for cell destruction.
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Affiliation(s)
- Johannes Everse
- Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA.
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Ricoux R, Lecomte S, Policar C, Boucher JL, Mahy JP. Spectroscopic investigation of isonitrile complexes of ferric and ferrous microperoxidase 8. J Inorg Biochem 2005; 99:1165-73. [PMID: 15833340 DOI: 10.1016/j.jinorgbio.2005.02.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2004] [Revised: 02/10/2005] [Accepted: 02/12/2005] [Indexed: 11/27/2022]
Abstract
Microperoxidase 8 (MP8) is able to react with alkyl- and aryl-isonitriles (RNC) both in its reduced and oxidized states, to form MP8Fe(II)- and MP8Fe(III)-CNR complexes. The coordination and spin states of these complexes have been fully characterized by UV-visible and resonance Raman spectroscopies. Both MP8Fe(II)- and MP8Fe(III)-CNR complexes are hexacoordinate low-spin complexes, which bear a single RNC ligand on the distal face of the heme and keep the His 18 ligand on its proximal face, trans to the RNC ligand. A comparison of these characteristics with those of the Fe-CNR complexes of other hemoproteins suggests that both MP8Fe(II)- and MP8Fe(III)-CNR complexes present a Fe-C-N linear arrangement. This may be due to the lack of any interactions of the RNC ligand with the octapeptide of MP8 that is mainly located over the opposite face of the heme. Finally the formation of hexacoordinate low-spin MP8Fe(II)- and MP8Fe(III)-CNR complexes constitutes a new example of the reactivity of MP8 with a new class of weak sigma-donating and strong pi-accepting ligands, which adds to its already very rich coordination chemistry.
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Affiliation(s)
- Rémy Ricoux
- Laboratoire de Chimie Bioorganique et Bioinorganique, UMR 8124, CNRS, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Bâtiment 420, Université Paris-Sud XI, F-91405 Orsay, France
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45
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Di Tullio A, Caputi L, Malatesta F, Reale S, De Angelis F. Characterization of a novel microperoxidase from Marinobacter hydrocarbonoclasticus by electrospray ionization tandem mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2005; 40:325-330. [PMID: 15674861 DOI: 10.1002/jms.788] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Microperoxidases are small heme-peptides obtained by proteolytic digestion of cytochrome c, exhibiting peroxidase activity. They consist of a short- or medium-length polypeptide chain, covalently linked to an iron protoporphyrin IX moiety via two thioether bonds involving Cys residues at the c-porphyrin A and B pyrrole rings. These small molecules are interesting for a wide range of possible applications. We have structurally characterized, by means of electrospray ionization (ESI) mass and tandem mass spectrometric experiments, a novel microperoxidase called MMP-5 (Marinobacter MicroPeroxidase-5), obtained by proteolytic digestion of cytochrome c552, a monoheminic electron-transfer protein isolated from Marinobacter hydrocarbonoclasticus. This microperoxidase, which still maintains the functional peptide moieties for peroxidase activity, is devoid of the two amino acids intercalating the Cys residues linked to the c-porphyrin, thus increasing its water solubility. Once submitted to the ESI source potential, MMP-5 showed an interesting tendency for the reduction of the iron protoporphyrin substructure. This behaviour was clearly evidenced by the mass shift exhibited by the reduced form.
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Affiliation(s)
- Alessandra Di Tullio
- Department of Chemistry, Chemical Engineering and Materials, University of L'Aquila, L'Aquila, Italy
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46
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Dallacosta C, Casella L, Monzani E. Modified Microperoxidases Exhibit Different Reactivity Towards Phenolic Substrates. Chembiochem 2004; 5:1692-9. [PMID: 15532028 DOI: 10.1002/cbic.200400175] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The reactivity of several microperoxidase derivatives with different distal-site environments has been studied. The distal-site environments of these heme peptides include a positively charged one, an uncharged environment, two bulky and doubly or triply positively charged ones, and one containing aromatic apolar residues. The reactivity in the catalytic oxidation of two representative phenols, carrying opposite charges, by hydrogen peroxide has been investigated. This allows the determination of the binding constants and of the electron-transfer rate from the phenol to the catalyst in the substrate/microperoxidase complex. The electron-transfer rates scarcely depend on the redox and charge properties of the phenol, but depend strongly on the microperoxidase. Information on the disposition of the substrate in the adducts with the microperoxidases has been obtained through determination of the paramagnetic contribution to the 1H NMR relaxation rates of the protons of the bound substrates. The data show that the electron-transfer rate drops when the substrate binds too far away from the iron and that the phenols bind to microperoxidases at similar distances to those observed with peroxidases. While the reaction rate of microperoxidases with peroxide is significantly smaller than that of the enzymes, the efficiency in the one-electron oxidation of phenolic substrates is almost comparable. Interestingly, the oxyferryl form of the triply positively charged microperoxidases shows a reactivity larger than that exhibited by horseradish peroxidase.
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Affiliation(s)
- Corrado Dallacosta
- Dipartimento di Chimica Generale, Università di Pavia, Via Taramelli 12, 27100 Pavia, Italy
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Hlavica P. Models and mechanisms of O-O bond activation by cytochrome P450. A critical assessment of the potential role of multiple active intermediates in oxidative catalysis. ACTA ACUST UNITED AC 2004; 271:4335-60. [PMID: 15560776 DOI: 10.1111/j.1432-1033.2004.04380.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cytochrome P450 enzymes promote a number of oxidative biotransformations including the hydroxylation of unactivated hydrocarbons. Whereas the long-standing consensus view of the P450 mechanism implicates a high-valent iron-oxene species as the predominant oxidant in the radicalar hydrogen abstraction/oxygen rebound pathway, more recent studies on isotope partitioning, product rearrangements with 'radical clocks', and the impact of threonine mutagenesis in P450s on hydroxylation rates support the notion of the nucleophilic and/or electrophilic (hydro)peroxo-iron intermediate(s) to be operative in P450 catalysis in addition to the electrophilic oxenoid-iron entity; this may contribute to the remarkable versatility of P450s in substrate modification. Precedent to this mechanistic concept is given by studies with natural and synthetic P450 biomimics. While the concept of an alternative electrophilic oxidant necessitates C-H hydroxylation to be brought about by a cationic insertion process, recent calculations employing density functional theory favour a 'two-state reactivity' scenario, implicating the usual ferryl-dependent oxygen rebound pathway to proceed via two spin states (doublet and quartet); state crossing is thought to be associated with either an insertion or a radicalar mechanism. Hence, challenge to future strategies should be to fold the disparate and sometimes contradictory data into a harmonized overall picture.
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Affiliation(s)
- Peter Hlavica
- Walther-Straub-Institut für Pharmakologie und Toxikologie der LMU, München, Germany.
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48
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Ghirlanda G, Osyczka A, Liu W, Antolovich M, Smith KM, Dutton PL, Wand AJ, DeGrado WF. De novo design of a D2-symmetrical protein that reproduces the diheme four-helix bundle in cytochrome bc1. J Am Chem Soc 2004; 126:8141-7. [PMID: 15225055 DOI: 10.1021/ja039935g] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An idealized, water-soluble D(2)-symmetric diheme protein is constructed based on a mathematical parametrization of the backbone coordinates of the transmembrane diheme four-helix bundle in cytochrome bc(1). Each heme is coordinated by two His residues from diagonally apposed helices. In the model, the imidazole rings of the His ligands are held in a somewhat unusual perpendicular orientation as found in cytochrome bc(1), which is maintained by a second-shell hydrogen bond to a Thr side chain on a neighboring helix. The resulting peptide is unfolded in the apo state but assembles cooperatively upon binding to heme into a well-folded tetramer. Each tetramer binds two hemes with high affinity at low micromolar concentrations. The equilibrium reduction midpoint potential varies between -76 mV and -124 mV vs SHE in the reducing and oxidizing direction, respectively. The EPR spectrum of the ferric complex indicates the presence of a low-spin species, with a g(max) value of 3.35 comparable to those obtained for hemes b of cytochrome bc(1) (3.79 and 3.44). This provides strong support for the designed perpendicular orientation of the imidazole ligands. Moreover, NMR spectra show that the protein exists in solution in a unique conformation and is amenable to structural studies. This protein may provide a useful scaffold for determining how second-shell ligands affect the redox potential of the heme cofactor.
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Affiliation(s)
- Giovanna Ghirlanda
- Johnson Research Foundation and Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA 19104, USA.
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49
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Lecomte S, Ricoux R, Mahy JP, Korri-Youssoufi H. Microperoxidase 8 adsorbed on a roughened silver electrode as a monomeric high-spin penta-coordinated species: characterization by SERR spectroscopy and electrochemistry. J Biol Inorg Chem 2004; 9:850-8. [PMID: 15340868 DOI: 10.1007/s00775-004-0586-4] [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] [Received: 04/16/2004] [Accepted: 07/26/2004] [Indexed: 10/26/2022]
Abstract
Microperoxidase 8 (MP8), a heme octapeptide obtained by hydrolytic digestion of cytochrome c, was adsorbed at the surface of a roughened silver electrode in order to provide a new supported biomimetic system for hemoproteins. A combination of two techniques was used to study its redox and coordination properties: electrochemistry and surface-enhanced resonance Raman (SERR) spectroscopy. This allowed us to show that MP8 could be adsorbed as a monolayer at the surface of the roughened silver electrode, where it could undergo a reversible electron transfer. Under those conditions, a redox potential of -0.4 V vs. SCE (-0.16 V vs. NHE) was measured for MP8, which was almost identical to that reported for N-acetyl-MP8 in aqueous solution. In addition, whereas MP8 appeared to aggregate in solution, and led to a mixture of high-spin penta-coordinated (5cHS) and low-spin hexa-coordinated (6cLS) iron(III) or iron(II) species, it was recovered almost exclusively as a monomeric high-spin penta-coordinated species at the surface of the electrode, both in the reduced and in the oxidized states. This then allowed a free coordination site on the iron, on the distal face of MP8 accessible to ligands. Accordingly, experiments performed in the presence of potassium cyanide demonstrated that MP8 adsorbed on a silver electrode could be ligated by a sixth CN(-) ligand. Thus there is the possibility of binding several kinds of ligands such as O(2) or H(2)O(2), which will open the way to biocatalysis of oxidation reactions at the surface of an electrode, or ligands such as drugs which will lead to the design of new biosensors for molecules of biological interest.
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Affiliation(s)
- Sophie Lecomte
- LADIR, CNRS/UPMC, 2 rue Henri Dunant, 94320 Thiais, France.
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50
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Affiliation(s)
- Charles J Reedy
- Department of Chemistry, Columbia University, 3000 Broadway, MC 3121, New York, New York 10027, USA
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