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Ranghino G, Antonini G, Fantucci P. Molecular Modeling of Heme Peptides: Molecular Dynamics Simulation of Microperoxidase. Isr J Chem 2013. [DOI: 10.1002/ijch.199400027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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2
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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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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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4
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Simonneaux G, Bondon A. Mechanism of Electron Transfer in Heme Proteins and Models: The NMR Approach. Chem Rev 2005; 105:2627-46. [PMID: 15941224 DOI: 10.1021/cr030731s] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gérard Simonneaux
- Laboratoire de Chimie Organométallique et Biologique, UMR CNRS 6509, Institut de Chimie, Université de Rennes 1, France.
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Kim S, Jin G, Lim M. Dynamics of Geminate Recombination of NO with Myoglobin in Aqueous Solution Probed by Femtosecond Mid-IR Spectroscopy. J Phys Chem B 2004. [DOI: 10.1021/jp0489020] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Seongheun Kim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Korea
| | - Geunyeong Jin
- 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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Carraway AD, Miller GT, Pearce LL, Peterson J. The Alkaline Transition of Bis(N-acetylated) Heme Undecapeptide. Inorg Chem 1998; 37:4654-4661. [PMID: 11670617 DOI: 10.1021/ic971391u] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Alkaline forms of the ferric bis(N-acetylated) heme undecapeptide of cytochrome c (N-ac-HUP) and some of its derivatives have been studied by electronic absorption and electron paramagnetic resonance spectroscopies. Surprisingly, even at pH >12, no evidence could be found for the formation of a hydroxyl ion adduct, in direct contrast to a previous report concerning ferric heme peptides encapsulated in detergent micelles (Mazumdar et al. Inorg. Chem. 1991, 30, 700-705). A spectroscopically determined pK(a) of approximately 9 is assigned to the deprotonation of the constituent histidine ligand of heme iron in N-ac-HUP. The present findings are not entirely in keeping with those of an earlier study concerning the properties of N-acetylated heme octapeptide (Wang et al. J. Biol. Chem. 1992, 35, 15310-15318), the differences observed being attributed to the buffering media employed in the two investigations. The implications of the current results in relation to a better understanding of the alkaline transitions observed in hemoglobins and myoglobins is considered.
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Affiliation(s)
- Angela D. Carraway
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, Department of Mathematical and Physical Sciences, Northwestern State University of Louisiana, Natchitoches, Louisiana 71497, Department of Pharmacology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, and Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213
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7
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Ippoliti R, Picciau A, Santucci R, Antonini G, Brunori M, Ranghino G. Covalent complex of microperoxidase with a 21-residue synthetic peptide as a maquette for low-molecular-mass redox proteins. Biochem J 1997; 328 ( Pt 3):833-40. [PMID: 9396728 PMCID: PMC1218994 DOI: 10.1042/bj3280833] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Here we report the structural and functional characterization of a covalent complex (MKP) obtained by cross-linking microperoxidase (Mp), the haem-undecapeptide obtained by the peptic digestion of cytochrome c, with a 21-residue synthetic peptide (P21) analogous to the S-peptide of the RNase A. The covalent complex has been prepared by introducing a disulphide bond between Cys-1 of P21 and Lys-13 of Mp, previously modified with a thiol-containing reagent. On formation of the complex (which is a monomer), the helical content of P21 increases significantly. The results obtained indicate that His-13 of P21 co-ordinates to the sixth co-ordination position of the haem iron, thus leading to the formation of a complex characterized by an equilibrium between an 'open' and a 'closed' structure, as confirmed by molecular dynamics simulations. Under acidic pH conditions, where His-13 of P21 is loosely bound to the haem iron ('open' conformation), MKP displays appreciable, quasi-reversible electrochemical activity; in contrast, at neutral pH ('closed' conformation) electrochemical behaviour is negligible, indicating that P21 interferes with the electron-transfer properties typical of Mp. On the whole, MKP is a suitable starting material for building a miniature haem system, with interesting potential for application to biosensor technology.
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Affiliation(s)
- R Ippoliti
- Department of Biochemical Sciences 'A. Rossi-Fanelli', University of Rome La Sapienza, P. le Aldo Moro 5, 00185 Rome, Italy
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Affiliation(s)
- Donald W. Low
- Contribution from the Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and the Department of Chemistry, Carlsberg Laboratory, Gamle Carlsberg Vej 10, DK-2500, Valby, Denmark
| | - Harry B. Gray
- Contribution from the Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and the Department of Chemistry, Carlsberg Laboratory, Gamle Carlsberg Vej 10, DK-2500, Valby, Denmark
| | - Jens Ø. Duus
- Contribution from the Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and the Department of Chemistry, Carlsberg Laboratory, Gamle Carlsberg Vej 10, DK-2500, Valby, Denmark
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Melchionna S, Barteri M, Ciccotti G. Molecular Dynamics of Microperoxidases in Aqueous and Nonaqueous Solutions. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9607273] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. Melchionna
- Dipartimento di Chimica and INFM−Dipartimento di Fisica, Università “La Sapienza”, 00185 Roma, Italy
| | - M. Barteri
- Dipartimento di Chimica and INFM−Dipartimento di Fisica, Università “La Sapienza”, 00185 Roma, Italy
| | - G. Ciccotti
- Dipartimento di Chimica and INFM−Dipartimento di Fisica, Università “La Sapienza”, 00185 Roma, Italy
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Munro OQ, Marques HM. Heme-Peptide Models for Hemoproteins. 2. N-Acetylmicroperoxidase-8: Study of the pi-pi Dimers Formed at High Ionic Strength Using a Modified Version of Molecular Exciton Theory. Inorg Chem 1996; 35:3768-3779. [PMID: 11666563 DOI: 10.1021/ic950285u] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AcMP8 is the Cys-14-acetylated water-soluble heme-octapeptide fragment obtained proteolytically from cytochrome c. Two successive dimerization equilibria are observed with increasing ionic strength in aqueous solution at neutral pH (part 1, preceding article). The electronic spectra of the two pi-pi dimers were extracted from the absorption envelopes at 2.01 and 4.02 M ionic strength and resolved by Gaussian analysis. The principal transitions were assigned using a tailored version of molecular exciton theory based on coupling of the main x- and y-polarized transition dipole moments of the interacting heme groups. The spectra of both pi-pi dimers indicate that the y-polarized exciton states are blue-shifted relative to the excited states of the monomer, while the x-polarized exciton states exhibit a red shift. These shifts were correctly predicted by a simple dipole-dipole coupling model. From an analysis of the resultant transition dipole moments to the exciton states with B(x)()(0,0) and B(y)()(0,0) character and the magnitudes of their red and blue exciton shifts, respectively, we have determined the dipole-dipole interaction geometries for both dimers. The principal difference between the interaction geometry in the first dimer and that in the second is a stronger interaction for the y-polarized transition dipoles and somewhat weakened interaction for the x-polarized transition dipoles. From an analysis of available crystallographic data for porphyrin and metalloporphyrin pi-pi dimers (Scheidt, W. R.; Lee, Y. J. Struct. Bonding 1987, 64, 1) and the results of our exciton model, we conclude that the origin of the coordinate system for the Soret transition dipole moments of AcMP8 is not metal-centered. Furthermore, since the true directions of the x- and y-axes of the low-symmetry heme chromophore in AcMP8 are unknown, we have not been able to determine the structures of the pi-pi dimers from a knowledge of their transition dipole-dipole interaction geometries. This study therefore highlights one of the shortfalls of molecular exciton theory.
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Affiliation(s)
- Orde Q. Munro
- Centre for Molecular Design, Department of Chemistry, University of the Witwatersrand, Wits 2050, Johannesburg, South Africa
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Carraway AD, Povlock SL, Houston ML, Johnston DS, Peterson J. Monomeric ferric heme peptide derivatives: model systems for hemoproteins. J Inorg Biochem 1995; 60:267-76. [PMID: 8530922 DOI: 10.1016/0162-0134(95)00026-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Electron paramagnetic resonance spectra of a number of ferric heme peptide derivatives, in aqueous-detergent and various aqueous-alcohol solvent mixtures, have been obtained using samples in the concentration range 0.1-1.0 mM. Some of these were clearly monomeric, homogeneous, mixed-ligand adducts, entirely suitable for use as model systems for hemoprotein spectroscopic studies. As anticipated, the measured EPR parameters were largely independent of solvent environment. Surprisingly, micellar preparations of ferric heme undecapeptide in mildly alkaline solution showed no evidence for the formation of a hydroxide adduct, contrary to a previous report [S. Mazumdar, O. K. Medhi and S. Mitra, Inorg. Chem. 30 700 (1991)].
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Affiliation(s)
- A D Carraway
- Department of Chemistry, University of Alabama, Tuscaloosa 35487-0336, USA
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13
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Arciero DM, Hooper AB, Cai M, Timkovich R. Evidence for the structure of the active site heme P460 in hydroxylamine oxidoreductase of Nitrosomonas. Biochemistry 1993; 32:9370-8. [PMID: 8369308 DOI: 10.1021/bi00087a016] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Hydroxylamine oxidoreductase (HAO) is responsible for the oxidation of hydroxylamine to nitrite in nitrification by Nitrosomonas europaea. It has an alpha n subunit structure and eight covalently bound hemes per subunit. Seven of these have visible spectra indistinguishable from heme c. The eighth, designated as P460, has unusual visible spectroscopic features in the enzyme and in a heme-containing proteolytic fragment. Its structure has not been previously determined. Enzymatic digestions of HAO were performed, and various proteolytic fragments were purified. Mass spectrometry confirmed the presence of authentic heme c in some fragments, that is, iron protoporphyrin IX cross-linked by two thioether bonds to cysteine residues. It was possible to detect the presence of the P460 pigment in some fragments, based upon the sensitivity of this pigment to treatment of the holoenzyme with hydrogen peroxide. A proteolytic fragment produced by sequential digestion with trypsin and pronase was shown to contain heme c and a hydrogen peroxide-sensitive heme with an unusual visible spectrum. This fragment contained two covalently cross-linked peptides. Mass spectrometry and NMR indicated that the P460 heme was iron protoporphyrin IX covalently bonded by two thioether bridges to peptide, but in addition there was a new, third covalent bond between a meso heme carbon and an aromatic ring carbon on a tyrosyl residue. The new covalent bond has been tentatively assigned to the C2 carbon of the tyrosyl ring and the 5-meso heme carbon (IUPAC-IUB tetrapyrrole nomenclature), although this location requires further proof.
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Affiliation(s)
- D M Arciero
- Department of Genetics and Cell Biology, University of Minnesota, St. Paul 55108
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Peterson J, Wilson MT. The reduction of haem peptides by dithionite. A kinetic investigation. Inorganica Chim Acta 1987. [DOI: 10.1016/s0020-1693(00)83271-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Aron J, Baldwin DA, Marques HM, Pratt JM, Adams PA. Hemes and hemoproteins. 1: Preparation and analysis of the heme-containing octapeptide (microperoxidase-8) and identification of the monomeric form in aqueous solution. J Inorg Biochem 1986; 27:227-43. [PMID: 3018151 DOI: 10.1016/0162-0134(86)80064-2] [Citation(s) in RCA: 123] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The heme-octapeptide from cytochrome c, Microperoxidase-8 (MP-8), was prepared by peptic and tryptic digestion of horse heart cytochrome c and purified by gel permeation chromatography in about 50% yield. Conditions for the identification of MP-8 by TLC and analysis by HPLC are described. Study of the concentration-dependence of the absorption spectrum showed that at concentrations of less than or equal to 2.5 X 10(-5) M in aqueous solution at pH 7, 25 degrees C and mu = 0.1, MP-8 exists as an equilibrium mixture of monomers and dimers with KD = 1.17 +/- 0.02 X 10(5) M-1, decreasing to 1.21 +/- 0.02 X 10(4) M-1 and 2.16 +/- 0.21 X 10(3) M-1 in 20% and 50% (v/v) methanol:water mixtures, respectively. Comparison of the Soret region spectrum of monomeric MP-8 with other hemoproteins suggests that it is six-coordinate in aqueous solution with water and His as axial ligands.
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