101
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Kirk BB, Trevitt AJ, Blanksby SJ, Tao Y, Moore BN, Julian RR. Ultraviolet Action Spectroscopy of Iodine Labeled Peptides and Proteins in the Gas Phase. J Phys Chem A 2012; 117:1228-32. [DOI: 10.1021/jp305470j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Benjamin B. Kirk
- ARC Centre of Excellence for
Free Radical Chemistry and Biotechnology, School of Chemistry, University of Wollongong, New South Wales 2522, Australia
| | - Adam J. Trevitt
- ARC Centre of Excellence for
Free Radical Chemistry and Biotechnology, School of Chemistry, University of Wollongong, New South Wales 2522, Australia
| | - Stephen J. Blanksby
- ARC Centre of Excellence for
Free Radical Chemistry and Biotechnology, School of Chemistry, University of Wollongong, New South Wales 2522, Australia
| | - Yuanqi Tao
- Department of Chemistry, University of California, Riverside, California 92521,
United States
| | - Benjamin N. Moore
- Department of Chemistry, University of California, Riverside, California 92521,
United States
| | - Ryan R. Julian
- Department of Chemistry, University of California, Riverside, California 92521,
United States
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102
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Rosu F, Gabelica V, De Pauw E, Antoine R, Broyer M, Dugourd P. UV Spectroscopy of DNA Duplex and Quadruplex Structures in the Gas Phase. J Phys Chem A 2012; 116:5383-91. [DOI: 10.1021/jp302468x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Frédéric Rosu
- Département de Chimie, Université de Liège, Building B6c, 3, allée de la chimie, 4000 Liège, Belgium
| | - Valérie Gabelica
- Département de Chimie, Université de Liège, Building B6c, 3, allée de la chimie, 4000 Liège, Belgium
| | - Edwin De Pauw
- Département de Chimie, Université de Liège, Building B6c, 3, allée de la chimie, 4000 Liège, Belgium
| | - Rodolphe Antoine
- CNRS and Université Lyon 1, UMR5579, Boulevard du 11 novembre 1918, 69622 Villeurbanne, France
| | - Michel Broyer
- CNRS and Université Lyon 1, UMR5579, Boulevard du 11 novembre 1918, 69622 Villeurbanne, France
| | - Philippe Dugourd
- CNRS and Université Lyon 1, UMR5579, Boulevard du 11 novembre 1918, 69622 Villeurbanne, France
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103
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Röhr MIS, Petersen J, Brunet C, Antoine R, Broyer M, Dugourd P, Bonačić-Koutecký V, O'Hair RAJ, Mitrić R. Synthesis and Spectroscopic Characterization of Diphenylargentate, [(C6H5)2Ag](.). J Phys Chem Lett 2012; 3:1197-1201. [PMID: 26288055 DOI: 10.1021/jz300280f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present the structural and optical properties of the isolated diphenylargentate anion, which has been synthesized by multistage mass spectrometry in a quadrupole ion trap. The experimental photodetachment spectrum has been obtained by action spectroscopy. Comparison with quantum chemical calculations of the electronic absorption spectrum allows for a precise characterization of the spectroscopic features, showing that in the low-energy regime, the optical properties of diphenylargentate bear a significant resemblance to those of atomic silver.
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Affiliation(s)
- M I S Röhr
- †Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, D-12489 Berlin, Germany
| | - J Petersen
- ‡Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - C Brunet
- §Université Lyon 1, CNRS, 43 Bd du 11 Novembre 1918, F-69622 Villeurbanne cedex, France
| | - R Antoine
- §Université Lyon 1, CNRS, 43 Bd du 11 Novembre 1918, F-69622 Villeurbanne cedex, France
| | - M Broyer
- §Université Lyon 1, CNRS, 43 Bd du 11 Novembre 1918, F-69622 Villeurbanne cedex, France
| | - P Dugourd
- §Université Lyon 1, CNRS, 43 Bd du 11 Novembre 1918, F-69622 Villeurbanne cedex, France
| | - V Bonačić-Koutecký
- †Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, D-12489 Berlin, Germany
- ⊥Interdisciplinary Center for Advanced Science and Technology, University of Split, Meštrovićevo Šetalište 45, HR-21000 Split, Croatia
| | - R A J O'Hair
- #School of Chemistry, Bio21 Institute of Molecular Science and Biotechnology, ARC Centre of Excellence in Free Radical Chemistry and Biotechnology, The University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - R Mitrić
- ‡Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
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104
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Brunet C, Antoine R, Lemoine J, Dugourd P. Soret Band of the Gas-Phase Ferri-Cytochrome c. J Phys Chem Lett 2012; 3:698-702. [PMID: 26286275 DOI: 10.1021/jz300070r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the first visible spectrum of a heme-protein in the gas phase. The aim of this work was to provide a reference for the optical absorption of an isolated heme-protein to better understand the influence of protein conformation and fluctuation and of solvent on its optical properties. After laser irradiation of gas-phase cytochrome c (cyt c), electron emission is observed. Electron photodetachment yield of cyt c 6- was recorded in the region of the Soret band of the porphyrin group, showing a maximum at 410 nm. Our results are compared with optical spectra of gas-phase heme and of cyt c in solution. We discuss the influence of the polypeptide chain and of the solvent on both the position and the broadening of the Soret band. Action spectrum of gas-phase cyt c is close to the absorption of native cyt c in solution, suggesting an efficient protection of the heme group from solvent accessibility by the polypeptide chain and similar interactions between the two moieties in solution and the gas phase.
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Affiliation(s)
- Claire Brunet
- †Université Lyon 1, Lyon, France
- ‡CNRS, LASIM UMR 5579, 43 bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France
- §CNRS, Institut des Sciences Analytique UMR 5180, 43 bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France
| | - Rodolphe Antoine
- †Université Lyon 1, Lyon, France
- ‡CNRS, LASIM UMR 5579, 43 bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France
| | - Jérôme Lemoine
- †Université Lyon 1, Lyon, France
- §CNRS, Institut des Sciences Analytique UMR 5180, 43 bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France
| | - Philippe Dugourd
- †Université Lyon 1, Lyon, France
- ‡CNRS, LASIM UMR 5579, 43 bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France
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105
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González-Magaña O, Reitsma G, Bari S, Hoekstra R, Schlathölter T. Length effects in VUV photofragmentation of protonated peptides. Phys Chem Chem Phys 2012; 14:4351-4. [PMID: 22354411 DOI: 10.1039/c2cp23470j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We have studied photoionization of protonated synthetic peptides YG(n)F (n = 0, 1, 3, 5, 10). Photon energies ranging from 8 to 30 eV were used. For YG(n)F peptides up to n = 5 small fragment ions related to the sidechains of the aromatic terminal amino acids Y and F dominate the fragmentation patterns. The associated yields scale with total photoabsorption cross section, demonstrating efficient hole migration towards the terminal amino acids upon photoionization of the peptide backbone. For n = 10 the side-chain loss channel is quenched and a series of large dications appear.
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Affiliation(s)
- O González-Magaña
- KVI Atomic and Molecular Physics, University of Groningen, The Netherlands
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106
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Kelly O, Calvert CR, Greenwood JB, Zettergren H, Nielsen SB, Wyer JA. Effects of charge location on the absorptions and lifetimes of protonated tyrosine peptides in vacuo. J Phys Chem A 2012; 116:1701-9. [PMID: 22268622 DOI: 10.1021/jp208578w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nearby charges affect the electronic energy levels of chromophores, with the extent of the effect being determined by the magnitude of the charge and degree of charge-chromophore separation. The molecular configuration dictates the charge-chromophore distance. Hence, in this study, we aim to assess how the location of the charge influences the absorption of a set of model protonated and diprotonated peptide ions, and whether spectral differences are large enough to be identified. The studied ions were the dipeptide YK, the tripeptide KYK (Y = tyrosine; K = lysine) and their complexes with 18-crown-6-ether (CE). The CE targets the ammonium group by forming internal ionic hydrogen bonds and limits the folding of the peptide. In the tripeptide, the distance between the chromophore and the backbone ammonium is enlarged relative to that in the dipeptide. Experiments were performed in an electrostatic ion storage ring using a tunable laser system, and action spectra based on lifetime measurements were obtained in the range from 210 to 310 nm. The spectra are all quite similar though there seems to be some changes in the absorption band between 210 and 250 nm, while in the lower energy band all ions had a maximum absorption at ~275 nm. Lifetimes after photoexcitation were found to shorten upon protonation and lengthen upon CE complexation, in accordance with the increased number of degrees of freedom and an increase in activation energies for dissociation as the mobile proton model is no longer operative.
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Affiliation(s)
- Orla Kelly
- Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN, UK
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107
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Brunet C, Antoine R, Dugourd P, Canon F, Giuliani A, Nahon L. Formation and fragmentation of radical peptide anions: insights from vacuum ultra violet spectroscopy. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2012; 23:274-281. [PMID: 22083590 DOI: 10.1007/s13361-011-0285-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Revised: 10/17/2011] [Accepted: 10/19/2011] [Indexed: 05/31/2023]
Abstract
We have studied the photodissociation of gas-phase deprotonated caerulein anions by vacuum ultraviolet (VUV) photons in the 4.5 to 20 eV range, as provided by the DESIRS beamline at the synchrotron radiation facility SOLEIL (France). Caerulein is a sulphated peptide with three aromatic residues and nine amide bonds. Electron loss is found to be the major relaxation channel at every photon energy. However, an increase in the fragmentation efficiency (neutral losses and peptide backbone cleavages) as a function of the energy is also observed. The oxidized ions, generated by electron photodetachment were further isolated and activated by collision (CID) in a MS(3) scheme. The branching ratios of the different fragments observed by CID as a function of the initial VUV photon energy are found to be independent of the initial photon energy. Thus, there is no memory effect of the initial excitation energy on the fragmentation channels of the oxidized species on the time scale of our tandem MS experiment. We also report photofragment yields as a function of photon energy for doubly deprotonated caerulein ions, for both closed-shell ([M-2H](2-)) non-radical ions and open-shell ([M-3H](2-•)) radical ions. These latter ions are generated by electron photodetachment from [M-3H](3-) precursor ions. The detachment yield increases monotonically with the energy with the appearance of several absorption bands. Spectra for radical and non-radical ions are quite similar in terms of observed bands; however, the VUV fragmentation yield is enhanced by the presence of a radical in caerulein peptides.
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108
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Bialach PM, Martin TC, Gerhards M. IR and IR + UV spectroscopy of isolated [Al–AcPheOMe]n+ cluster cations (n = 1, 3). Phys Chem Chem Phys 2012; 14:8185-91. [DOI: 10.1039/c2cp00028h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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