1
|
Schubert K, Schwob L, Dörner S, Girod M, MacAleese L, Pieterse CL, Schlathölter T, Techert S, Bari S. Ionization and Photofragmentation of Isolated Metalloporphyrin Cations Investigated by VUV Action Spectroscopy*. Chemistry 2021; 27:12371-12379. [PMID: 34137472 PMCID: PMC8457234 DOI: 10.1002/chem.202101515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Indexed: 11/13/2022]
Abstract
We investigated the photoionization and fragmentation of isolated metal protoporphyrin IX cations (MPPIX+ with M=Fe, Co, Zn) by means of vacuum-ultraviolet (VUV) action spectroscopy in the energy range of 8.5-35 eV. Experiments were carried out in the gas phase by interfacing an electrospray ionization tandem mass spectrometer with a synchrotron beamline. The mass spectra and partial ion yields show that photoexcitation of the precursor ions predominantly leads to . CH2 COOH radical side-chain losses of the macrocycle with additional methyl radical (. CH3 ) side-chain losses. Ionization, in contrast, leads to the formation of the intact ionized precursor and various doubly charged fragments which are mostly due to side-chain cleavages. Although statistical fragmentation dominates, we found evidence for non-statistical processes such as new fragments involving for example single and double H2 O losses, indicating that different relaxation mechanisms are at play upon photoionization compared to photoexcitation. The measured ionization energies were 9.6±0.2 eV, 9.4±0.2 eV and 9.6±0.2 eV for FePPIX+ , CoPPIX+ and ZnPPIX+ , respectively.
Collapse
Affiliation(s)
- Kaja Schubert
- Deutsches Elektronen-Synchrotron DESYNotkestr. 8522607HamburgGermany
| | - Lucas Schwob
- Deutsches Elektronen-Synchrotron DESYNotkestr. 8522607HamburgGermany
| | - Simon Dörner
- Deutsches Elektronen-Synchrotron DESYNotkestr. 8522607HamburgGermany
| | - Marion Girod
- Univ LyonUniversité Claude Bernard Lyon 1CNRS UMR 5280Institut des Sciences Analytiques5 rue de la Doua69100VilleurbanneFrance
| | - Luke MacAleese
- Univ LyonUniversité Claude Bernard Lyon 1CNRS UMR 5306Institut Lumière Matière69622LyonFrance
| | | | - Thomas Schlathölter
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
| | - Simone Techert
- Deutsches Elektronen-Synchrotron DESYNotkestr. 8522607HamburgGermany
- Institut für RöntgenphysikGeorg-August-Universität GöttingenFriedrich-Hund-Platz 137077GöttingenGermany
| | - Sadia Bari
- Deutsches Elektronen-Synchrotron DESYNotkestr. 8522607HamburgGermany
| |
Collapse
|
2
|
Charkin OP, Klimenko NM. Theoretical and Experimental Studies of Subnanoscale Molecules and Clusters. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2020. [DOI: 10.1134/s0036024420050040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
3
|
Aarabi M, Omidyan R, Soorkia S, Grégoire G, Broquier M, Crestoni ME, de la Lande A, Soep B, Shafizadeh N. The dramatic effect of N-methylimidazole on trans axial ligand binding to ferric heme: experiment and theory. Phys Chem Chem Phys 2019; 21:1750-1760. [PMID: 30623949 DOI: 10.1039/c8cp06210b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The binding energy of CO, O2 and NO to isolated ferric heme, [FeIIIP]+, was studied in the presence and absence of a σ donor (N-methylimidazole and histidine) as the trans axial ligand. This study combines the experimental determination of binding enthalpies by equilibrium measurements in a low temperature ion trap using the van't Hoff equation and high level DFT calculations. It was found that the presence of N-methylimidazole as the axial ligand on the [FeIIIP]+ porphyrin dramatically weakens the [FeIIIP-ligand]+ bond with an up to sevenfold decrease in binding energy owing to the σ donation by N-methylimidazole to the FeIII(3d) orbitals. This trans σ donor effect is characteristic of ligation to iron in hemes in both ferrous and ferric redox forms; however, to date, this has not been observed for ferric heme.
Collapse
Affiliation(s)
- Mohammad Aarabi
- Department of Chemistry, University of Isfahan, 81746-73441 Isfahan, Iran.
| | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Dillinger S, Lang J, Niedner-Schatteburg G. Cryo IR Spectroscopy of [Hemin] + Complexes in Isolation. J Phys Chem A 2017; 121:7191-7196. [PMID: 28876926 DOI: 10.1021/acs.jpca.7b08604] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We present cryo IR spectra of isolated [Hemin]+ adducts with CO, N2, and O2 ([Hemin(CO)1]+, [Hemin(CO)2]+, [Hemin(14N2)]+, [Hemin(15N2)]+, and [Hemin(O2)]+). Well resolved bands allow for the elucidation of structure and spin multiplicity in conjunction with density functional (DFT) calculations. There is a quartet spin state for the N2 and CO adducts and a sextet spin state for the O2 adduct, where the O2 retains its triplet state. The double CO adsorption induces significant changes in the vibrational patterns of the IR spectra, which we take as strong evidence for a spin quenching into a doublet. Our study characterizes [Hemin]+, which is the Fe3+ oxidation product of heme that is of ubiquitous presence in hemeproteins.
Collapse
Affiliation(s)
- Sebastian Dillinger
- Fachbereich Chemie and Forschungszentrum OPTIMAS, TU Kaiserslautern , 67663 Kaiserslautern, Germany
| | - Johannes Lang
- Fachbereich Chemie and Forschungszentrum OPTIMAS, TU Kaiserslautern , 67663 Kaiserslautern, Germany
| | | |
Collapse
|
5
|
Ferrand L, Soorkia S, Grégoire G, Broquier M, Soep B, Shafizadeh N. Bonding of heme Fe(III) with dioxygen: observation and characterization of an incipient bond. Phys Chem Chem Phys 2016; 17:25693-9. [PMID: 26059068 DOI: 10.1039/c5cp01585e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
While ferrous heme (Fe(II)) within hemoproteins binds dioxygen efficiently, it has not yet been possible to observe the analog complex with ferric heme (Fe(III)). We present the first observation and characterization of the latter complex in a cooled ion trap. The bond formation enthalpy of ferric heme-O2 has been derived from the Van't Hoff equation by means of temperature dependent measurements. The binding energy of the [heme Fe(III)-O2](+) ionic complex is rather strong as compared to that of [heme Fe(III)-N2](+), showing the formation of an incipient Fe-O bond, which is confirmed by the electronic absorption spectra of the two complexes. This first observation of the [heme Fe(III)-O2](+) complex lays the basis for the precise description of its electronic states.
Collapse
Affiliation(s)
- Léa Ferrand
- ISMO, Univ Paris-Sud, CNRS UMR 8214, bat 210 Univ Paris-Sud 91405, Orsay Cedex, France.
| | | | | | | | | | | |
Collapse
|
6
|
de la Lande A, Ha-Thi MH, Chen S, Soep B, Shafizadeh N. Structure of cobalt protoporphyrin chloride and its dimer, observation and DFT modeling. Phys Chem Chem Phys 2016; 18:16700-8. [DOI: 10.1039/c6cp02304e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this article we present a joint study by using time-of-flight mass spectroscopy and density functional theory of cobalt protoporphyrin dimer complexes.
Collapse
Affiliation(s)
- Aurélien de la Lande
- Laboratoire de Chimie Physique
- CNRS
- Université Paris-Sud
- Université Paris Saclay
- Orsay F-91405
| | - Minh-Huong Ha-Thi
- ISMO
- Univ Paris-Sud
- CNRS UMR 8214
- bat 210 Université Paris-Sud
- Université Paris Saclay
| | - Shufeng Chen
- Laboratoire de Chimie Physique
- CNRS
- Université Paris-Sud
- Université Paris Saclay
- Orsay F-91405
| | - Benoît Soep
- Laboratoire Francis Perrin CEA/DSM/IRAMIS/LIDyL – CNRS URA 2453
- CEA Saclay
- 91191 Gif-sur-Yvette Cedex
- France
| | - Niloufar Shafizadeh
- ISMO
- Univ Paris-Sud
- CNRS UMR 8214
- bat 210 Université Paris-Sud
- Université Paris Saclay
| |
Collapse
|
7
|
Ali ME, Oppeneer PM. Unraveling the Electronic Structure, Spin States, Optical and Vibrational Spectra of Malaria Pigment. Chemistry 2015; 21:8544-53. [DOI: 10.1002/chem.201406208] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Indexed: 12/19/2022]
|
8
|
De Petris A, Crestoni ME, Pirolli A, Rovira C, Iglesias-Fernández J, Chiavarino B, Ragno R, Fornarini S. Binding of azole drugs to heme: A combined MS/MS and computational approach. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.02.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
9
|
De Petris A, Chiavarino B, Crestoni ME, Coletti C, Re N, Fornarini S. Exploring the Conformational Variability in the Heme b Propionic Acid Side Chains through the Effect of a Biological Probe: A Study of the Isolated Ions. J Phys Chem B 2015; 119:1919-29. [DOI: 10.1021/jp5113476] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alberto De Petris
- Dipartimento
di Chimica e Tecnologie del Farmaco, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185, Roma, Italy
| | - Barbara Chiavarino
- Dipartimento
di Chimica e Tecnologie del Farmaco, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185, Roma, Italy
| | - Maria Elisa Crestoni
- Dipartimento
di Chimica e Tecnologie del Farmaco, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185, Roma, Italy
| | - Cecilia Coletti
- Dipartimento
di Farmacia, Università G. D’Annunzio, Via dei Vestini 31, I-66100 Chieti, Italy
| | - Nazzareno Re
- Dipartimento
di Farmacia, Università G. D’Annunzio, Via dei Vestini 31, I-66100 Chieti, Italy
| | - Simonetta Fornarini
- Dipartimento
di Chimica e Tecnologie del Farmaco, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185, Roma, Italy
| |
Collapse
|
10
|
Atak K, Golnak R, Xiao J, Suljoti E, Pflüger M, Brandenburg T, Winter B, Aziz EF. Electronic Structure of Hemin in Solution Studied by Resonant X-ray Emission Spectroscopy and Electronic Structure Calculations. J Phys Chem B 2014; 118:9938-43. [DOI: 10.1021/jp505129m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Kaan Atak
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, 12489 Berlin, Germany
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Ronny Golnak
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, 12489 Berlin, Germany
- Fachbereich
Chemie, Freie Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany
| | - Jie Xiao
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, 12489 Berlin, Germany
| | - Edlira Suljoti
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, 12489 Berlin, Germany
| | - Mika Pflüger
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, 12489 Berlin, Germany
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Tim Brandenburg
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, 12489 Berlin, Germany
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Bernd Winter
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, 12489 Berlin, Germany
| | - Emad F. Aziz
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, 12489 Berlin, Germany
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| |
Collapse
|
11
|
Xiao J, Golnak R, Atak K, Pflüger M, Pohl M, Suljoti E, Winter B, Aziz EF. Assistance of the Iron Porphyrin Ligands to the Binding Interaction between the Fe Center and Small Molecules in Solution. J Phys Chem B 2014; 118:9371-7. [DOI: 10.1021/jp5023339] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Jie Xiao
- Joint
Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
| | - Ronny Golnak
- Joint
Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
- Fachbereich
Biologie, Chemie, Pharmazie, Freie Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany
| | - Kaan Atak
- Joint
Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Mika Pflüger
- Joint
Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Marvin Pohl
- Joint
Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Edlira Suljoti
- Joint
Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
| | - Bernd Winter
- Joint
Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
| | - Emad F. Aziz
- Joint
Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| |
Collapse
|
12
|
Wyer JA, Jørgensen AV, Møller Pedersen B, Brøndsted Nielsen S. Gas-phase spectroscopy of ferric heme-NO complexes. Chemphyschem 2013; 14:4109-13. [PMID: 24166979 DOI: 10.1002/cphc.201300843] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Indexed: 11/10/2022]
Abstract
Weakly bound complexes between ferric heme cations and NO were synthesised in the gas phase from ion-molecule reactions, and their absorption measured based on photodissociation yields. The Soret band, which serves as an important marker band for heme-protein spectroscopy, is maximal at 357±5 nm and significantly blue-shifted compared to ferric heme nitrosyl proteins (maxima between 408 and 422 nm). This is in stark contrast to the Q-band absorption where the protein microenvironment is nearly innocent in perturbing the electronic structure of the porphyrin macrocycle. Photodissociation is primarily through loss of NO. In contrast to the Q-band region, two-photon absorption was seen in the Soret band despite NO loss only requiring ∼1 eV. A model based on intersystem crossing to a long-lived triplet state where a barrier has to be surmounted is suggested. Finally, we summarise the measured absorption maxima of heme and its complexes with amino acids and NO.
Collapse
Affiliation(s)
- Jean A Wyer
- Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C (Denmark), Fax: (+45) 8612 0740.
| | | | | | | |
Collapse
|
13
|
Hemoglobin-derived porphyrins preserved in a Middle Eocene blood-engorged mosquito. Proc Natl Acad Sci U S A 2013; 110:18496-500. [PMID: 24127577 DOI: 10.1073/pnas.1310885110] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Although hematophagy is found in ~14,000 species of extant insects, the fossil record of blood-feeding insects is extremely poor and largely confined to specimens identified as hematophagic based on their taxonomic affinities with extant hematophagic insects; direct evidence of hematophagy is limited to four insect fossils in which trypanosomes and the malarial protozoan Plasmodium have been found. Here, we describe a blood-engorged mosquito from the Middle Eocene Kishenehn Formation in Montana. This unique specimen provided the opportunity to ask whether or not hemoglobin, or biomolecules derived from hemoglobin, were preserved in the fossilized blood meal. The abdomen of the fossil mosquito was shown to contain very high levels of iron, and mass spectrometry data provided a convincing identification of porphyrin molecules derived from the oxygen-carrying heme moiety of hemoglobin. These data confirm the existence of taphonomic conditions conducive to the preservation of biomolecules through deep time and support previous reports of the existence of heme-derived porphyrins in terrestrial fossils.
Collapse
|
14
|
Charkin OP. Theoretical study of the structure and stability of oxo heme derivatives. RUSS J INORG CHEM+ 2013. [DOI: 10.1134/s0036023613030042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
15
|
Makarov AV, Charkin OP, Klimenko NM. Theoretical study of 3d-metal porphyrin π-complexes acetylene. RUSS J INORG CHEM+ 2011. [DOI: 10.1134/s0036023611070163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
16
|
Wyer JA, Nielsen SB. Absorption in the Q-band region by isolated ferric heme+ and heme+(histidine) in vacuo. J Chem Phys 2010; 133:084306. [DOI: 10.1063/1.3474998] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
|
17
|
Charkin OP. Theoretical study of the dimers of ferriporphyrin analogues (MC34H31N4O4)2 and their positive ions with 3d-metal atoms M. RUSS J INORG CHEM+ 2009. [DOI: 10.1134/s0036023609040172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
18
|
Lykkegaard MK, Zettergren H, Kirketerp MBS, Ehlerding A, Wyer JA, Kadhane U, Nielsen SB. Photodissociation of Isolated Ferric Heme and Heme-His Cations in an Electrostatic Ion Storage Ring. J Phys Chem A 2009; 113:1440-4. [DOI: 10.1021/jp809626v] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Morten Køcks Lykkegaard
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - Henning Zettergren
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - Maj-Britt Suhr Kirketerp
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - Anneli Ehlerding
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - Jean Ann Wyer
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - Umesh Kadhane
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - Steen Brøndsted Nielsen
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark
| |
Collapse
|
19
|
Chiavarino B, Crestoni ME, Fornarini S, Rovira C. Unravelling the intrinsic features of NO binding to iron(II)- and iron(III)-hemes. Inorg Chem 2008; 47:7792-801. [PMID: 18681420 DOI: 10.1021/ic800953w] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electrospray ionization of appropriate precursors is used to deliver [Fe (III)-heme] (+) and [Fe (II)-hemeH] (+) ions as naked species in the gas phase where their ion chemistry has been examined by Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. In the naked, four-coordinate [Fe (II)-hemeH] (+) and [Fe (III)-heme] (+) ions, the intrinsic reactivity of iron(II)- and iron(III)-hemes is revealed free from any influence due to axial ligand, counterion, or solvent effects. Ligand (L) addition and ligand transfer equilibria with a series of selected neutrals are attained when [Fe (II)-hemeH] (+), corresponding to protonated Fe (II)-heme, is allowed to react in the FT-ICR cell. A Heme Cation Basicity (HCB) ladder for the various ligands toward [Fe (II)-hemeH] (+), corresponding to -Delta G degrees for the process [Fe (II)-hemeH] (+) + L --> [Fe (II)-hemeH(L)] (+) and named HCB (II), can thus be established. The so-obtained HCB (II) values are compared with the corresponding HCB (III) values for [Fe (III)-heme] (+). In spite of pronounced differences displayed by various ligands, NO shows a quite similar HCB of about 67 kJ mol (-1) at 300 K toward both ions, estimated to correspond to a binding energy of 124 kJ mol (-1). Density Functional Theory (DFT) computations confirm the experimental results, yielding very similar values of NO binding energies to [Fe (II)-hemeH] (+) and [Fe (III)-heme] (+), equal to 140 and 144 kJ mol (-1), respectively. The kinetic study of the NO association reaction supports the equilibrium HCB data and reveals that the two species share very close rate constant values both for the forward and for the reverse reaction. These gas phase results diverge markedly from the kinetics and thermodynamic behavior of NO binding to iron(II)- and iron(III)-heme proteins and model complexes in solution. The requisite of either a very labile or a vacant coordination site on iron for a facile addition of NO to occur, suggested to explain the bias for typically five-coordinate iron(II) species in solution, is fully supported by the present work.
Collapse
Affiliation(s)
- Barbara Chiavarino
- Dipartimento di Chimica e Tecnologia del Farmaco, Universita di Roma "La Sapienza", P.le A. Moro 5, I-00185 Roma, Italy
| | | | | | | |
Collapse
|
20
|
Bernigaud V, Drenck K, Huber BA, Hvelplund P, Jabot T, Kadhane U, Kirketerp MBS, Liu B, Lykkegaard MK, Manil B, Nielsen SB. Electron-capture-induced dissociation of protoporphyrin IX ions. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2008; 19:809-813. [PMID: 18276153 DOI: 10.1016/j.jasms.2008.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 01/14/2008] [Accepted: 01/14/2008] [Indexed: 05/25/2023]
Abstract
Electron-capture induced dissociation of protoporphyrin cations and anions has been studied. The cations captured two electrons in two successive collisions and were converted to the corresponding even-electron anions. About one fifth of the ions lost a hydrogen atom to become radical anions but otherwise very little fragmentation was observed. The anions captured an electron to become dianions. No hydrogen loss occurred, and the only fragmentation channel observed was loss of CO2H, to give a doubly charged carbanion. Our results indicate that protoporphyrin ions are very efficient in accommodating one or even two electrons in the lowest unoccupied molecular orbital of the porphyrin macrocycle, and that electron capture induces only limited dissociation.
Collapse
Affiliation(s)
- Virgile Bernigaud
- Centre de Recherche sur les Ions, les Matériaux et la Photonique, Caen Cedex 5, France
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Charkin OP, Makarov AV, Klimenko NM. Theoretical study of first-row transition metal porphyrins and their carbonyl complexes. RUSS J INORG CHEM+ 2008. [DOI: 10.1134/s0036023608050100] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
22
|
Støchkel K, Kadhane U, Andersen JU, Holm AIS, Hvelplund P, Kirketerp MBS, Larsen MK, Lykkegaard MK, Nielsen SB, Panja S, Zettergren H. A new technique for time-resolved daughter ion mass spectrometry on the microsecond to millisecond time scale using an electrostatic ion storage ring. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:023107. [PMID: 18315283 DOI: 10.1063/1.2884121] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A new method for time-resolved daughter ion mass spectrometry is presented, based on the electrostatic ion storage ring in Aarhus, ELISA. Ions with high internal energy, e.g., as a result of photoexcitation, dissociate and the yield of neutrals is monitored as a function of time. This gives information on lifetimes in the microsecond to millisecond time range but no information on the fragment masses. To determine the dissociation channels, we have introduced pulsed supplies with switching times of a few microseconds. This allows rapid switching from storage of parent ions to storage of daughter ions, which are dumped into a detector after a number of revolutions in the ring. A fragment mass spectrum is obtained by monitoring the daughter ion signal as a function of the ring voltages. This technique allows identification of the dissociation channels and determination of the time dependent competition between these channels.
Collapse
Affiliation(s)
- Kristian Støchkel
- Institute for Storage Ring Facilities, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Charkin OP, Klimenko NM, Charkin DO, Lin SH. Theoretical study of the structure and stability of the heme dimer (FeC34H32N4O4)2 and its ion (FeC34H32N4O4) 2 +. RUSS J INORG CHEM+ 2007. [DOI: 10.1134/s0036023607070170] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|