51
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Naktode K, Reddy TDN, Nayek HP, Mallik BS, Panda TK. Heavier group 2 metal complexes with a flexible scorpionate ligand based on 2-mercaptopyridine. RSC Adv 2015. [DOI: 10.1039/c5ra04696c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Synthetic and structural details of flexible scorpionate ligand based on 2-mercaptopyridine (Bmp) supported heavier alkaline earth metal complexes with metal–sulfur bonds (metal = Sr, Ba) have been presented.
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Affiliation(s)
- Kishor Naktode
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- India
| | | | - Hari Pada Nayek
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad
- India
| | - Bhabani S. Mallik
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- India
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- India
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52
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Wang JH, Tang GM, Qin TX, Yan SC, Wang YT, Cui YZ, Weng Ng S. A set of alkali and alkaline-earth coordination polymers based on the ligand 2-(1H-benzotriazol-1-yl) acetic acid: Effects the radius of metal ions on structures and properties. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.07.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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53
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Dhaked DK, Bharatam PV. Conformational and zwitterionic preferences of N-amidinoglycine: the effect of microsolvation and metal ion addition. RSC Adv 2014. [DOI: 10.1039/c4ra06079b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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54
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Conformational analysis of glutamic acid: a density functional approach using implicit continuum solvent model. J Mol Model 2014; 20:2396. [PMID: 25135067 DOI: 10.1007/s00894-014-2396-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 07/23/2014] [Indexed: 10/24/2022]
Abstract
Amino acids are constituents of proteins and enzymes which take part almost in all metabolic reactions. Glutamic acid, with an ability to form a negatively charged side chain, plays a major role in intra and intermolecular interactions of proteins, peptides, and enzymes. An exhaustive conformational analysis has been performed for all eight possible forms at B3LYP/cc-pVTZ level. All possible neutral, zwitterionic, protonated, and deprotonated forms of glutamic acid structures have been investigated in solution by using polarizable continuum model mimicking water as the solvent. Nine families based on the dihedral angles have been classified for eight glutamic acid forms. The electrostatic effects included in the solvent model usually stabilize the charged forms more. However, the stability of the zwitterionic form has been underestimated due to the lack of hydrogen bonding between the solute and solvent; therefore, it is observed that compact neutral glutamic acid structures are more stable in solution than they are in vacuum. Our calculations have shown that among all eight possible forms, some are not stable in solution and are immediately converted to other more stable forms. Comparison of isoelectronic glutamic acid forms indicated that one of the structures among possible zwitterionic and anionic forms may dominate over the other possible forms. Additional investigations using explicit solvent models are necessary to determine the stability of charged forms of glutamic acid in solution as our results clearly indicate that hydrogen bonding and its type have a major role in the structure and energy of conformers.
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55
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van Stipdonk MJ, Basu P, Dille SA, Gibson JK, Berden G, Oomens J. Infrared multiple photon dissociation spectroscopy of a gas-phase oxo-molybdenum complex with 1,2-dithiolene ligands. J Phys Chem A 2014; 118:5407-18. [PMID: 24988369 PMCID: PMC4338922 DOI: 10.1021/jp503222v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
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Electrospray
ionization (ESI) in the negative ion mode was used
to create anionic, gas-phase oxo-molybdenum complexes with dithiolene
ligands. By varying ESI and ion transfer conditions, both doubly and
singly charged forms of the complex, with identical formulas, could
be observed. Collision-induced dissociation (CID) of the dianion generated
exclusively the monoanion, while fragmentation of the monoanion involved
decomposition of the dithiolene ligands. The intrinsic structure of
the monoanion and the dianion were determined by using wavelength-selective
infrared multiple-photon dissociation (IRMPD) spectroscopy and density
functional theory calculations. The IRMPD spectrum for the dianion
exhibits absorptions that can be assigned to (ligand) C=C,
C–S, C—C≡N, and Mo=O stretches. Comparison
of the IRMPD spectrum to spectra predicted for various possible conformations
allows assignment of a pseudo square pyramidal structure with C2v symmetry, equatorial coordination
of MoO2+ by the S atoms of the dithiolene ligands, and
a singlet spin state. A single absorption was observed for the oxidized
complex. When the same scaling factor employed for the dianion is
used for the oxidized version, theoretical spectra suggest that the
absorption is the Mo=O stretch for a distorted square pyramidal
structure and doublet spin state. A predicted change in conformation
upon oxidation of the dianion is consistent with a proposed bonding
scheme for the bent-metallocene dithiolene compounds [Lauher, J. W.; Hoffmann, R. J. Am.
Chem. Soc.1976, 98, 1729−1742], where a large
folding of the dithiolene moiety along the S···S vector
is dependent on the occupancy of the in-plane metal d-orbital.
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Affiliation(s)
- Michael J van Stipdonk
- Department of Chemistry and Biochemistry, Duquesne University , 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, United States
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56
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Meng L, Lin Z. Complexations of alkali/alkaline earth metal cations with gaseous glutamic acid. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.04.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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57
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Greisch JF, Harding ME, Klopper W, Kappes MM, Schooss D. Effect of Proton Substitution by Alkali Ions on the Fluorescence Emission of Rhodamine B Cations in the Gas Phase. J Phys Chem A 2014; 118:3787-3794. [DOI: 10.1021/jp502833c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jean-François Greisch
- Institute
of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Michael E. Harding
- Institute
of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Wim Klopper
- Institute
of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, 76344 Eggenstein-Leopoldshafen, Germany
- Institute
of Physical Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg
2, 76131 Karlsruhe, Germany
| | - Manfred M. Kappes
- Institute
of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, 76344 Eggenstein-Leopoldshafen, Germany
- Institute
of Physical Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg
2, 76131 Karlsruhe, Germany
| | - Detlef Schooss
- Institute
of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, 76344 Eggenstein-Leopoldshafen, Germany
- Institute
of Physical Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg
2, 76131 Karlsruhe, Germany
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58
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Pang R, Lin ZJ. Conformations and Metal Ion Affinities of Glutamine Binding with Alkali and Alkaline Earth Metal Cations: an ab initio Study. CHINESE J CHEM PHYS 2014. [DOI: 10.1063/1674-0068/27/02/189-199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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59
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Kong X. Reinvestigation of the structure of protonated lysine dimer. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:422-426. [PMID: 24420385 DOI: 10.1007/s13361-013-0801-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 11/30/2013] [Accepted: 12/03/2013] [Indexed: 06/03/2023]
Abstract
To better understand inconsistencies between the predicted infrared (IR) spectra of previously suggested isomers of Lys2H(+) reported by Wu et al. (J. Am. Soc. Mass Spectrom. 22:1651-1659, 18) and the experimental IR photon dissociation (IRPD) spectrum obtained by Oh et al. (J. Am. Chem. Soc. 127:4076-4083, 4), the structure of Lys2H(+) was reinvestigated using IRPD spectroscopy in the extended region 2700-3700 cm(-1) and theoretical calculations. The new experimental IRPD spectrum is in good agreement with Oh's spectrum in the corresponding wavelength range. Based on calculations at the MP2/6-311++G(d,p)//B3LYP/6-311++G(d,p) and MP2/6-31 + G(d,p)//MP2/6-31 + G(d,p) levels, a new salt-bridged isomer, ZW1, was found to be the most stable isomer; it is more energetically favored than the previously suggested charge-solvated isomer LL-CS01 by 10 or 26 kJ mol(-1). Although the calculated IR spectrum of ZW1 is in good agreement with the experimental one in the range 2700-3700 cm(-1), it is in poor agreement with the previous IRPD spectrum in the range 1000-1900 cm(-1). This investigation shows that the intermolecular interactions inside the dimer are more complex than previously supposed. It is possible that both salt-bridged and charge-solvated isomers of Lys2H(+) are stable in the gas phase, and the isomers generated during ionization are sensitive to the experimental conditions.
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Affiliation(s)
- Xianglei Kong
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Collaborative Innovation Center of Chemical Science and Engineering, 300071, Tianjin, China,
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60
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Qin P, Lü W, Qin W, Zhang W, Xie H. Theoretical studies on complexes of calcium ion with amino acids. Chem Res Chin Univ 2014. [DOI: 10.1007/s40242-014-3303-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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61
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Dunbar RC. Spectroscopy of Metal-Ion Complexes with Peptide-Related Ligands. Top Curr Chem (Cham) 2014; 364:183-223. [DOI: 10.1007/128_2014_578] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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62
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Burt M, Wilson K, Marta R, Hasan M, Scott Hopkins W, McMahon T. Assessing the impact of anion–π effects on phenylalanine ion structures using IRMPD spectroscopy. Phys Chem Chem Phys 2014; 16:24223-34. [DOI: 10.1039/c4cp03776f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The gas-phase structures of two halide-bound phenylalanine anions (PheX−, X = Cl− or Br−) and five fluorinated derivatives have been identified using infrared multiple photon dissociation (IRMPD) spectroscopy.
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Affiliation(s)
- Michael Burt
- Department of Chemistry
- University of Waterloo
- Waterloo, Canada
| | - Kathleen Wilson
- Department of Chemistry
- University of Waterloo
- Waterloo, Canada
| | - Rick Marta
- Department of Chemistry
- University of Waterloo
- Waterloo, Canada
| | - Moaraj Hasan
- Department of Chemistry
- University of Waterloo
- Waterloo, Canada
| | | | - Terry McMahon
- Department of Chemistry
- University of Waterloo
- Waterloo, Canada
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63
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Walker M, Sen A, Harvey AJ, Dessent CE. Complexation of anions to gas-phase amino acids: Conformation is critical in determining if the global minimum is canonical or zwitterionic. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.09.074] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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64
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Theoretical study of hydrated Ca2+-amino acids (glycine, threonine and phenylalanine) clusters. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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65
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Latrous L, Tortajada J, Haldys V, Léon E, Correia C, Salpin JY. Gas-phase interactions of organotin compounds with glycine. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:795-806. [PMID: 23832935 DOI: 10.1002/jms.3223] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 03/08/2013] [Accepted: 04/22/2013] [Indexed: 06/02/2023]
Abstract
Gas-phase interactions of organotins with glycine have been studied by combining mass spectrometry experiments and quantum calculations. Positive-ion electrospray spectra show that the interaction of di- and tri-organotins with glycine results in the formation of [(R)2Sn(Gly)-H](+) and [(R)3Sn(Gly)](+) ions, respectively. Di-organotin complexes appear much more reactive than those involving tri-organotins. (MS/MS) spectra of the [(R)3Sn(Gly)](+) ions are indeed simple and only show elimination of intact glycine, generating the [(R)3Sn](+) carbocation. On the other hand, MS/MS spectra of [(R)2Sn(Gly)-H](+) complexes are characterized by numerous fragmentation processes. Six of them, associated with elimination of H2O, CO, H2O + CO and formation of [(R)2SnOH](+) (-57 u),[(R)2SnNH2](+) (-58 u) and [(R)2SnH](+) (-73 u), are systematically observed. Use of labeled glycines notably concludes that the hydrogen atoms eliminated in water and H2O + CO are labile hydrogens. A similar conclusion can be made for hydrogens of [(R2)SnOH](+) and [(R2)SnNH2](+) ions. Interestingly, formation [(R)2SnH](+) ions is characterized by a migration of one the α hydrogen of glycine onto the metallic center. Finally, several dissociation routes are observed and are characteristic of a given organic substituent. Calculations indicated that the interaction between organotins and glycine is mostly electrostatic. For [(R)2Sn(Gly)-H](+) complexes, a preferable bidentate interaction of the type η(2)-O,NH2 is observed, similar to that encountered for other metal ions. [(R)3Sn](+) ions strongly stabilize the zwitterionic form of glycine, which is practically degenerate with respect to neutral glycine. In addition, the interconversion between both forms is almost barrierless. Suitable mechanisms are proposed in order to account for the most relevant fragmentation processes.
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Affiliation(s)
- Latifa Latrous
- Laboratoire de Chimie-Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire, 2092, El Manar, Tunis, Tunisia.
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66
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Schmidt J, Kass SR. Zwitterion vs Neutral Structures of Amino Acids Stabilized by a Negatively Charged Site: Infrared Photodissociation and Computations of Proline–Chloride Anion. J Phys Chem A 2013; 117:4863-9. [DOI: 10.1021/jp402267c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Jacob Schmidt
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Steven R. Kass
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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67
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Surface modified fluorescent quantum dots with neurotransmitter ligands for potential targeting of cell signaling applications. Colloids Surf B Biointerfaces 2013; 111:60-70. [PMID: 23777793 DOI: 10.1016/j.colsurfb.2013.05.030] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2013] [Revised: 05/06/2013] [Accepted: 05/20/2013] [Indexed: 11/22/2022]
Abstract
The possibility of combining nanotechnology with nanomedicine opens a broad field of research which may truly revolutionize our society. The neural system plays a crucial role in the human body, and most related diseases can dramatically change the quality of life. Thus, the present study reports a novel approach for using neurotransmitters as ligands in the synthesis of surface-modified fluorescent nanocrystals for potential use in cell labeling applications. Briefly, CdS quantum dots (QDs) were prepared using L-glutamic and L-aspartic as surface capping agents via a one-step chemical processing method, which resulted in stable aqueous colloidal systems at room temperature and ambient pressure. UV-visible spectroscopy, photoluminescence spectroscopy (PL), Fourier transform infrared (FTIR) spectroscopy, and transmission electron microscopy (TEM) were used to characterize the synthesis and relative stability of peptide-capped CdS nanocrystals. The results demonstrate that both ligands were effective in nucleating and stabilizing CdS quantum dots in colloidal aqueous suspensions, with an estimated dimension below 3.3 nm and with fluorescence activity. Thus, novel nanohybrids were developed based on QDs bioconjugated to surface-active neurotransmitter moieties suitable for investigation as potential biomarkers in cell targeting and signaling applications.
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68
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Takayama A, Yoshikawa R, Iyoku S, Kasuga NC, Nomiya K. Synthesis, structure and antimicrobial activity of L-argininesilver(1+) nitrate. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.07.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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69
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Wang C, Lin Z, Zhang R. Zwitterions are the most stable form for neutral arginylglycine in gas phase: Clear theoretical evidence. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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70
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Chiavarino B, Crestoni ME, Fornarini S, Scuderi D, Salpin JY. Interaction of Cisplatin with Adenine and Guanine: A Combined IRMPD, MS/MS, and Theoretical Study. J Am Chem Soc 2013; 135:1445-55. [DOI: 10.1021/ja309857d] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Barbara Chiavarino
- Dipartimento di Chimica e Tecnologie
del Farmaco, Università di Roma “La Sapienza”, P.le A. Moro 5, I-00185 Roma, Italy
| | - Maria Elisa Crestoni
- Dipartimento di Chimica e Tecnologie
del Farmaco, Università di Roma “La Sapienza”, P.le A. Moro 5, I-00185 Roma, Italy
| | - Simonetta Fornarini
- Dipartimento di Chimica e Tecnologie
del Farmaco, Università di Roma “La Sapienza”, P.le A. Moro 5, I-00185 Roma, Italy
| | - Debora Scuderi
- Laboratoire de Chimie-Physique, Université Paris Sud Orsay, Avenue Georges Clémenceau,
91405 Orsay Cedex, France
- CNRS-UMR 8000
| | - Jean-Yves Salpin
- Université d'Evry Val d'Essonne, Laboratoire Analyse et Modélisation
pour la Biologie et l’Environnement, Boulevard François
Mitterrand, 91025 Evry, France
- CNRS-UMR 8587
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71
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Piccirillo S, Ciavardini A, Bodo E, Rondino F, Scuderi D, Steinmetz V, Paladini A. Probing the competition among different coordination motifs in metal-ciprofloxacin complexes through IRMPD spectroscopy and DFT calculations. Inorg Chem 2013; 52:103-12. [PMID: 23252622 DOI: 10.1021/ic301299e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The vibrational spectra of ciprofloxacin complexes with monovalent (Li(+), Na(+), K(+), Ag(+)) and polyvalent (Mg(2+), Al(3+)) metal ions are recorded in the range 1000-1900 cm(-1) by means of infrared multiple-photon dissociation (IRMPD) spectroscopy. The IRMPD spectra are analyzed and interpreted in the light of density functional theory (DFT)-based quantum chemical calculations in order to identify the possible structures present under our experimental conditions. For each metal-ciprofloxacin complex, four isomers are predicted, considering different chelation patterns. A good agreement is found between the measured IRMPD spectrum and the calculated absorption spectrum of the most stable isomer for each complex. Metal ion size and charge are found to drive the competition among the different coordination motifs: small size and high charge density metal ions prefer to coordinate the quinolone between the two carbonyl oxygen atoms, whereas large-size metal ions prefer the carboxylate group as a coordination site. In the latter case, an intramolecular hydrogen bond compensates the weaker interaction established by these cations. The role of the metal cation on the stabilization of ionic and nonionic structures of ciprofloxacin is also investigated. It is found that large-size metal ions preferentially stabilize charge separated motifs and that the increase of metal ion charge has a stabilizing effect on the zwitterionic form of ciprofloxacin.
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Affiliation(s)
- Susanna Piccirillo
- Dip. di Scienze e Tecnologie Chimiche, Università di Roma 'Tor Vergata', via della Ricerca Scientifica, 00133 Rome, Italy
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72
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Han L, Hyung SJ, Ruotolo BT. Dramatically stabilizing multiprotein complex structure in the absence of bulk water using tuned Hofmeister salts. Faraday Discuss 2013; 160:371-88; discussion 389-403. [PMID: 23795511 PMCID: PMC3695445 DOI: 10.1039/c2fd20099f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
The role that water plays in the salt-based stabilization of proteins is central to our understanding of protein biophysics. Ion hydration and the ability of ions to alter water surface tension are typically invoked, along with direct ion-protein binding, to describe Hofmeister stabilization phenomena observed for proteins experimentally, but the relative influence of these forces has been extraordinarily difficult to measure directly. Recently, we have used gas-phase measurements of proteins and large multiprotein complexes, using a combination of innovative ion mobility (IM) and mass spectrometry (MS) techniques, to assess the ability of bound cations and anions to stabilize protein ions in the absence of the solvation forces described above. Our previous work has studied a broad set of 12 anions bound to a range of proteins and protein complexes, and while primarily motivated by the analytical challenges surrounding the gas-phase measurement of solution-phase relevant protein structures, our work has also lead to a detailed physical mechanism of anion-protein complex stabilization in the absence of bulk solvent. Our more-recent work has screened a similarly-broad set of cations for their ability to stabilize gas-phase protein structure, and we have discovered surprising differences between the operative mechanisms for cations and anions in gas-phase protein stabilization. In both cases, cations and anions affect protein stabilization in the absence of solvent in a manner that is generally reversed relative to their ability to stabilize the same proteins in solution. In addition, our evidence suggests that the relative solution-phase binding affinity of the anions and cations studied here is preserved in our gas-phase measurements, allowing us to study the influence of such interactions in detail. In this report, we collect and summarize such gas-phase measurements to distill a generalized picture of salt-based protein stabilization in the absence of bulk water. Further, we communicate our most recent efforts to study the combined effects of stabilizing cations and anions on gas-phase proteins, and identify those salts that bear anion/cation pairs having the strongest stabilizing influence on protein structures
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Affiliation(s)
- Linjie Han
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI 48109
| | - Suk-Joon Hyung
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI 48109
| | - Brandon T. Ruotolo
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI 48109
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Yang G, Zhu R, Zhou L, Liu C. Interactions of Zn(II) with single and multiple amino acids. Insights from density functional and ab initio calculations. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:1372-1383. [PMID: 23019170 DOI: 10.1002/jms.3075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Calculations were performed to study the interactions of metal ions (M) with (multiple) amino acids (AA) and fill the gap between single AA and proteins. A complete conformational search results in nine and eleven ZnGly isomers at B3P86 and MP2 levels, respectively, and four populated conformers of glycine are responsible for production of these isomers. For all M, the isomers via the OO and NO binding modes are the main constituents, and the OO mode is favored by stronger electrostatic interactions. Binding with more glycines causes larger structural distortions, improves relative stabilities of monodentate binding isomers and generates new binding modes (e.g. ZnB(III) via only the hydroxyl group). The scaling factor of Zn(Gly)(n) structures, the ratio of its binding affinity versus the sum of comprising ZnGly isomers, is linear with glycine number (n), and the linear relationship may not be altered by mutations of glycines and M. It thus allows to estimate M(AA)(n) binding affinities (n ≥ 2) from the comprising MAA structures and analyze their structures with kinetic methods. The DFT and MP2 results become comparable by increasing metal coordination, e.g. the ZnB(III) versus ZnA(I) (zwitterionic) relative energy differs by 41.9 kcal mol(-1) at B3P86 and MP2 levels and is close by addition of three water molecules (4.1 kcal mol(-1)). The presence of water solvent improves the relative stabilities of monodentate binding isomers and results in a broader conformational distribution.
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Affiliation(s)
- Gang Yang
- Institute of Theoretical Chemistry, Shandong University, Jinan, P R China.
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74
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Burt MB, Fridgen TD. Gas-Phase Structures of Pb2+-Cationized Phenylalanine and Glutamic Acid Determined by Infrared Multiple Photon Dissociation Spectroscopy and Computational Chemistry. J Phys Chem A 2012; 117:1283-90. [DOI: 10.1021/jp306420e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael B. Burt
- Department of Chemistry, Memorial University of Newfoundland,
St. John’s,
Newfoundland and Labrador, Canada, A1B 3X7
| | - Travis D. Fridgen
- Department of Chemistry, Memorial University of Newfoundland,
St. John’s,
Newfoundland and Labrador, Canada, A1B 3X7
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75
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Osburn S, Burgie T, Berden G, Oomens J, O’Hair RAJ, Ryzhov V. Structure and Reactivity of Homocysteine Radical Cation in the Gas Phase Studied by Ion–Molecule Reactions and Infrared Multiple Photon Dissociation. J Phys Chem A 2012; 117:1144-50. [DOI: 10.1021/jp304769y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sandra Osburn
- Department of Chemistry and
Biochemistry, and Center for Biochemical and Biophysical Studies, Northern Illinois University, Dekalb, Illinois 60115,
United States
| | - Ticia Burgie
- Department of Chemistry and
Biochemistry, and Center for Biochemical and Biophysical Studies, Northern Illinois University, Dekalb, Illinois 60115,
United States
| | - Giel Berden
- FOM Institute for Plasma Physics Rijnhuizen, Nieuwegein, The Netherlands
| | - Jos Oomens
- FOM Institute for Plasma Physics Rijnhuizen, Nieuwegein, The Netherlands
- University of Amsterdam, Amsterdam, The Netherlands
| | - Richard A. J. O’Hair
- School of Chemistry, The University of Melbourne, Melbourne, Victoria 3010,
Australia
- Bio21 Institute
of Molecular
Science and Biotechnology, The University of Melbourne, Melbourne, Victoria 3010, Australia
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Melbourne,
Victoria 3010, Australia
| | - Victor Ryzhov
- Department of Chemistry and
Biochemistry, and Center for Biochemical and Biophysical Studies, Northern Illinois University, Dekalb, Illinois 60115,
United States
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76
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Crestoni ME, Chiavarino B, Scuderi D, Di Marzio A, Fornarini S. Discrimination of 4-hydroxyproline diastereomers by vibrational spectroscopy of the gaseous protonated species. J Phys Chem B 2012; 116:8771-9. [PMID: 22764742 DOI: 10.1021/jp302382p] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydroxylation of proline is a prominent oxidative post-translational modification (oxPTM) in animals, characterized by site specificity and stereochemical control. The presence of this irreversible modification and the ensuing generation of a chiral center have been assayed in (2S,4R)-4-hydroxyproline and (2S,4S)-4-hydroxyproline forming the protonated species by electrospray ionization and sampling them by infrared multiple photon dissociation (IRMPD) spectroscopy. IRMPD spectra, recorded both in the 950-1950 cm(-1) (using the CLIO free electron laser) and in the 3200-3700 cm(-1) [using a tabletop parametric oscillator/amplifier (OPO/OPA) laser] regions, have been interpreted by comparison with the absorbance spectra of the lowest energy structures calculated at MP2/6-311+G** level of theory. Remarkable spectral differences have emerged in the fingerprint region, pointing to the unambiguous discrimination between S,R and S,S diastereomers. The main differences arise from the position of the carbonyl stretching mode, a signature of nonzwitterionic structures, moving from 1750 cm(-1) for the S,R form to 1770 cm(-1) for the S,S diastereomer. Furthermore, a well-defined band associated with the NH(2) wagging mode at 1333 cm(-1) is a distinct mark of the S,S isomer. Each gaseous protonated epimer comprises a population of at least three conformers, stabilized by intramolecular hydrogen bonds linking the two hydrogens of protonated secondary amine group with the 4-hydroxy substituent and with an oxygen atom of the carboxylic group, respectively. Interestingly, a tendency to adopt either C(4)-exo (up) or C(4)-endo (down) pyrrolidine puckering upon proline 4(R)- or 4(S)-hydroxylation, respectively, is observed here. The same bias is found in neutral hydroxyprolines and in collagen model peptides. In the protonated species under examination, this bias originates chirality-induced vibrational features revealed by IRMPD spectroscopy.
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Affiliation(s)
- Maria Elisa Crestoni
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma La Sapienza, P. le A. Moro 5, I-00185 Roma, Italy.
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77
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Yao ZJ, Huo XK, Jin GX. Zwitterionic half-sandwich Rh and Ir complexes containing a diphosphine nido-carborane ligand: synthesis, structure transformation and application in H2 activation. Chem Commun (Camb) 2012; 48:6714-6. [PMID: 22627318 DOI: 10.1039/c2cc32036c] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several novel zwitterionic half-sandwich complexes and pseudocloso metallacarboranes based on 1,2-(PPh(2))(2)-1,2-C(2)B(10)H(10) were successfully prepared, and further study proved that some of them can activate H(2) to form the metal hydride complexes Cp*M(H)(7,8-(PPh(2))(2)-7,8-C(2)B(9)H(10)) (M = Rh, Ir).
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Affiliation(s)
- Zi-Jian Yao
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China
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78
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Brückmann L, Tyrra W, Mathur S, Berden G, Oomens J, Meijer AJHM, Schäfer M. Examination of the Coordination Sphere of AlIII in Trifluoromethyl-Heteroarylalkenolato Complex Ions by Gas-Phase IRMPD Spectroscopy and Computational Modelling. Chemphyschem 2012; 13:2037-45. [DOI: 10.1002/cphc.201200132] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Indexed: 11/05/2022]
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79
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Remko M, Šoralová S. Effect of water coordination on competition between π and non-π cation binding sites in aromatic amino acids: l-phenylalanine, l-tyrosine, and l-tryptophan Li+, Na+, and K+ complexes. J Biol Inorg Chem 2012; 17:621-30. [DOI: 10.1007/s00775-012-0882-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 01/28/2012] [Indexed: 10/14/2022]
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80
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Citir M, Hinton CS, Oomens J, Steill JD, Armentrout PB. Infrared Multiple Photon Dissociation Spectroscopy of Cationized Histidine: Effects of Metal Cation Size on Gas-Phase Conformation. J Phys Chem A 2012; 116:1532-41. [DOI: 10.1021/jp209636a] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Murat Citir
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United
States
| | - Christopher S. Hinton
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United
States
| | - Jos Oomens
- FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan
14, 3439 MN Nieuwegein, The Netherlands
- Van’t Hoff Institute for
Molecular Sciences, University of Amsterdam, Amsterdam, The Netherlands
| | - Jeffrey D. Steill
- FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan
14, 3439 MN Nieuwegein, The Netherlands
| | - P. B. Armentrout
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United
States
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81
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Milner EM, Nix MGD, Dessent CEH. Collision-Induced Dissociation of Halide Ion–Arginine Complexes: Evidence for Anion-Induced Zwitterion Formation in Gas-Phase Arginine. J Phys Chem A 2012; 116:801-9. [DOI: 10.1021/jp208183p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Edward M. Milner
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Michael G. D. Nix
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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82
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Burt MB, Decker SGA, Fridgen TD. Water binding energies of [Pb(amino acid-H)H2O]+ complexes determined by blackbody infrared radiative dissociation. Phys Chem Chem Phys 2012; 14:15118-26. [DOI: 10.1039/c2cp41440f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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83
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Burt MB, Fridgen TD. Structures and physical properties of gaseous metal cationized biological ions. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2012; 18:235-250. [PMID: 22641728 DOI: 10.1255/ejms.1177] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Metal chelation can alter the activity of free biomolecules by modifying their structures or stabilizing higher energy tautomers. In recent years, mass spectrometric techniques have been used to investigate the effects of metal complexation with proteins, nucleobases and nucleotides, where small conformational changes can have significant physiological consequences. In particular, infrared multiple photon dissociation spectroscopy has emerged as an important tool for determining the structure and reactivity of gas-phase ions. Unlike other mass spectrometric approaches, this method is able to directly resolve structural isomers using characteristic vibrational signatures. Other activation and dissociation methods, such as blackbody infrared radiative dissociation or collision-induced dissociation can also reveal information about the thermochemistry and dissociative pathways of these biological ions. This information can then be used to provide information about the structures of the ionic complexes under study. In this article, we review the use of gas-phase techniques in characterizing metal-bound biomolecules. Particular attention will be given to our own contributions, which detail the ability of metal cations to disrupt nucleobase pairs, direct the self-assembly of nucleobase clusters and stabilize non-canonical isomers of amino acids.
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Affiliation(s)
- Michael B Burt
- Department of Chemistry, Memorial University of Newfoundland, St John's, Newfoundland and Labrador, Canada, A1B 3X7
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84
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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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85
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Burt MB, Decker SGA, Atkins CG, Rowsell M, Peremans A, Fridgen TD. Structures of bare and hydrated [Pb(aminoacid-H)]+ complexes using infrared multiple photon dissociation spectroscopy. J Phys Chem B 2011; 115:11506-18. [PMID: 21875029 DOI: 10.1021/jp2068655] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Infrared multiple-photon dissociation (IRMPD) spectroscopy was used to determine the gas-phase structures of deprotonated Pb(2+)/amino acid (Aa) complexes with and without a solvent molecule present. Five amino acid complexes with side chains containing only carbon and hydrogen (Ala, Val, Leu, Ile, Pro) and one with a basic side chain (Lys) were compared. These experiments demonstrated that all [Pb(Aa-H)](+) complexes have Pb(2+) covalently bound between the amine nitrogen and carbonyl oxygen. The nonhydrated complexes containing Ala, Val, Leu, Ile, and Pro are amine-deprotonated, whereas the one containing Lys is deprotonated at its carboxylic acid. The difference is attributed to the polar and basic side chain of lysine, which helps stabilize Pb(2+). IRMPD spectroscopy was also performed on the monohydrated analogues of the [Pb(Aa-H)](+) complexes. The [Pb(Aa-H)H(2)O](+) complexes, where Aa = Ala, Val, Leu, and Ile, exhibited two N-H stretches as well as a carboxylic acid O-H and a PbO-H stretch. Hence, their structures are monohydrated versions of the amine-deprotonated [Pb(Aa-H)](+) complexes where a proton transfer has occurred from the lead-bound water to the deprotonated amine. The IRMPD spectrum and calculations suggest that [Pb(Pro-H)H(2)O](+) has a hydrated carboxylate salt structure. The structure of [Pb(Lys-H)H(2)O](+) was also carboxyl-deprotonated, but Pb(2+) is bound to the carbonyl oxygen and the amine nitrogen, with one of the protons belonging to the water transferred to the basic side chain. This results in an intramolecular hydrogen bond that does not absorb in the region of the spectrum probed in these experiments. The IRMPD spectra and structural characterizations were confirmed and aided by infrared spectra calculated at the B3LYP/6-31+G(d,p) level of theory and 298 K enthalpies and Gibbs energies using the MP2(full)/6-311++G(2d,2p) method on the B3LYP geometries.
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Affiliation(s)
- Michael B Burt
- Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada, A1B 3X7
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86
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Eizaguirre A, Mó O, Yáñez M, Salpin JY. Modeling the interactions between peptide functions and Sr2+: formamide-Sr2+ reactions in the gas phase. Phys Chem Chem Phys 2011; 13:18409-17. [PMID: 21901223 DOI: 10.1039/c1cp21578g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interactions between formamide, which can be considered a prototype of a peptide function, and Sr(2+) have been investigated by combining nanoelectrospray ionization/mass spectrometry techniques and G96LYP DFT calculations. For Sr an extended LANL2DZ basis set was employed, together with a 6-311+G(3df,2p) basis set expansion for the remaining atoms of the system. The observed reactivity seems to be dominated by the Coulomb explosion process yielding [SrOH](+) + [HNCH](+), which are the most intense peaks in the MS/MS spectra. Nevertheless, additional peaks corresponding to the loss of HNC and CO indicate that the association of Sr(2+) to water or to ammonia leads to long-lived doubly charged species detectable in the timescale of these experimental techniques. The topology of the calculated potential energy surface permits us to establish the mechanisms behind these processes. Although the interaction between the neutral base and Sr(2+) is essentially electrostatic, the polarization triggered by the doubly charged metal ion results in the activation of several bonds, and favors different proton transfer mechanisms required for the formation of the [SrOH](+), [SrOH(2)](2+) and [SrNH(3)](2+) products.
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Affiliation(s)
- Ane Eizaguirre
- Departamento de Química, Módulo 13, Facultad de Ciencias, Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049, Madrid, Spain
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87
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Wu R, Marta RA, Martens JK, Eldridge KR, McMahon TB. Experimental and theoretical investigation of the proton-bound dimer of lysine. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:1651-9. [PMID: 21953268 DOI: 10.1007/s13361-011-0178-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Revised: 05/21/2011] [Accepted: 05/21/2011] [Indexed: 05/23/2023]
Abstract
The structure of the proton-bound lysine dimer has been investigated by infrared multiple photon dissociation (IRMPD) spectroscopy and electronic structure calculations. The structures of different possible isomers of the proton-bound lysine dimer have been optimized at the B3LYP/6-31 + G(d) level of theory and IR spectra calculated using the same computational method. Based on relative Gibbs free energies (298 K) calculated at the MP2/aug-cc-pVTZ//B3LYP/6-31 + G(d) level of theory, LL-CS01, and followed closely (1.1 kJ mol(-1)) by LL-CS02 are the most stable non-zwitterionic isomers. At the MP2/aug-cc-pVTZ//6-31 + G(d) and MP2/aug-cc-pVTZ//6-31 + (d,p) levels of theory, isomer LL-CS02 is favored by 3.0 and 2.3 kJ mol(-1), respectively. The relative Gibbs free energies calculated by the aforementioned levels of theory for LL-CS01 and LL-CS02 are very close and strongly suggest that diagnostic vibrational signatures found in the IRMPD spectrum of the proton-bound dimer of lysine can be attributed to the existence of both isomers. LL-ZW01 is the most stable zwitterionic isomer, in which the zwitterionic structure of the neutral lysine is well stabilized by the protonated lysine moiety via a very strong intermolecular hydrogen bond. At the MP2/aug-cc-pVTZ//B3LYP/6-31 + G(d), MP2/aug-cc-pVTZ//6-31 + G(d) and MP2/aug-cc-pVTZ//6-31 + G(d,p) levels of theory, the most stable zwitterionic isomer (LL-ZW01) is less favored than LL-CS01 by 7.3, 4.1 and 2.3 kJ mol(-1), respectively. The experimental IRMPD spectrum also confirms that the proton-bound dimer of lysine largely exists as charge-solvated isomers. Investigation of zwitterionic and charge-solvated species of amino acids in the gas phase will aid in a further understanding of structure, property, and function of biological molecules.
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Affiliation(s)
- Ronghu Wu
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
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88
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Yao H, Steill JD, Oomens J, Jockusch RA. Infrared Multiple Photon Dissociation Action Spectroscopy and Computational Studies of Mass-Selected Gas-Phase Fluorescein and 2′,7′-Dichlorofluorescein Ions. J Phys Chem A 2011; 115:9739-47. [DOI: 10.1021/jp201946a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Huihui Yao
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Jeffrey D. Steill
- FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439 Mn Nieuwegein, The Netherlands
| | - Jos Oomens
- FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439 Mn Nieuwegein, The Netherlands
- University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Rebecca A. Jockusch
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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89
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Salpin JY, Guillaumont S, Ortiz D, Tortajada J, Maître P. Direct evidence for tautomerization of the uracil moiety within the Pb2+/uridine-5'-monophosphate complex: a combined tandem mass spectrometry and IRMPD study. Inorg Chem 2011; 50:7769-78. [PMID: 21744847 DOI: 10.1021/ic200918q] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The structure of the [Pb(UMP)-H](+) (UMP = uridine-5'-monophosphate) complex was studied in the gas phase by combining electrospray ionization (ESI), tandem mass spectrometry, and mid-infrared multiple photon dissociation (IRMPD) spectroscopy. The results obtained show that Pb(2+) ions interact not only with the deprotonated phosphate group but also with a carbonyl group of the nucleobase moiety by folding of the mononucleotide, resulting in macrochelates that are not likely to be present in solution. Comparison between the IRMPD and DFT-computed spectra suggests that the ESI-generated complex likely corresponds to a mixture of several structures, and establishes the enolic tautomers as the most abundant species for the [Pb(UMP)-H](+) ion, while the very weak IRMPD signal observed at ∼1763 cm(-1) points to a minor population of oxo forms. Our data also suggest that losing the nucleobase residue under CID conditions does not necessarily mean a lack of interaction between the metal and the nucleobase moiety, as commonly reported in the literature for large oligonucleotides.
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Affiliation(s)
- Jean-Yves Salpin
- Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, Université d'Evry Val d'Essonn e, Bâtiment Maupertuis, Boulevard François Mitterrand, 91025 Evry, France.
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90
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Dunbar RC, Steill JD, Oomens J. Encapsulation of metal cations by the PhePhe ligand: a cation-π ion cage. J Am Chem Soc 2011; 133:9376-86. [PMID: 21553844 DOI: 10.1021/ja200219q] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Structures and binding thermochemistry are investigated for protonated PhePhe and for complexes of PhePhe with the alkaline-earth ions Ba(2+) and Ca(2+), the alkali-metal ions Li(+), Na(+), K(+), and Cs(+), and the transition-metal ion Ag(+). The two neighboring aromatic side chains open the possibility of a novel encapsulation motif of the metal ion in a double cation-π configuration, which is found to be realized for the alkaline-earth complexes and, in a variant form, for the Ag(+) complex. Experimentally, complexes are formed by electrospray ionization, trapped in an FT-ICR mass spectrometer, and characterized by infrared multiple photon dissociation (IRMPD) spectroscopy using the free electron laser FELIX. Interpretation is assisted by thermochemical and IR spectral calculations using density functional theory (DFT). The IRMPD spectrum of protonated PhePhe is reproduced with good fidelity by the calculated spectrum of the most stable conformation, although the additional presence of the secondmost stable conformation is not excluded. All metal-ion complexes have charge-solvated binding modes, with zwitterion (salt bridge) forms being much less stable. The amide oxygen always coordinates to the metal ion, as well as at least one phenyl ring (cation-π interaction). At least one additional chelation site is always occupied, which may be either the amino nitrogen or the carboxy carbonyl oxygen. The alkaline-earth complexes prefer a highly compact caged structure with both phenyl rings providing cation-π stabilization in a "sandwich" configuration (OORR chelation). The alkali-metal complexes prefer open-cage structures with only one cation-π interaction, except perhaps Cs(+). The Ag(+) complex shows a unique preference for the closed-cage amino-bound NORR structure. Ligand-driven perturbations of normal-mode frequencies are generally found to correlate linearly with metal-ion binding energy.
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Affiliation(s)
- Robert C Dunbar
- Chemistry Department, Case Western Reserve University, Cleveland, Ohio 44106, USA.
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91
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Stewart H, Wu G, Ma L, Barclay M, Vieira AD, King A, Cox H, Stace AJ. Ultraviolet Photofragmentation Spectroscopy of Alkaline Earth Dication Complexes with Pyridine and 4-Picoline (4-Methyl pyridine). J Phys Chem A 2011; 115:6948-60. [DOI: 10.1021/jp112171j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Hamish Stewart
- Department of Physical and Theoretical Chemistry, School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kindom
| | - Guohua Wu
- Department of Physical and Theoretical Chemistry, School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kindom
| | - Lifu Ma
- Department of Physical and Theoretical Chemistry, School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kindom
| | - Michael Barclay
- Department of Chemistry and Biochemistry, University of Sussex, Falmer, Brighton BN1 9QJ, United Kingdom
| | - Andreia Dias Vieira
- Department of Chemistry and Biochemistry, University of Sussex, Falmer, Brighton BN1 9QJ, United Kingdom
| | - Andrew King
- Department of Chemistry and Biochemistry, University of Sussex, Falmer, Brighton BN1 9QJ, United Kingdom
| | - Hazel Cox
- Department of Chemistry and Biochemistry, University of Sussex, Falmer, Brighton BN1 9QJ, United Kingdom
| | - Anthony J. Stace
- Department of Physical and Theoretical Chemistry, School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kindom
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92
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Prell JS, O’Brien JT, Williams ER. Structural and Electric Field Effects of Ions in Aqueous Nanodrops. J Am Chem Soc 2011; 133:4810-8. [DOI: 10.1021/ja108341t] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James S. Prell
- Department of Chemistry, University of California, Berkeley, California 94720-1460, United States
| | - Jeremy T. O’Brien
- Department of Chemistry, University of California, Berkeley, California 94720-1460, United States
| | - Evan R. Williams
- Department of Chemistry, University of California, Berkeley, California 94720-1460, United States
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93
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Effect of metal Ions (Ni²⁺, Cu²⁺ and Zn²⁺) and water coordination on the structure of L-phenylalanine, L-tyrosine, L-tryptophan and their zwitterionic forms. J Mol Model 2011; 17:3117-28. [PMID: 21360187 PMCID: PMC3224218 DOI: 10.1007/s00894-011-1000-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Accepted: 01/28/2011] [Indexed: 11/05/2022]
Abstract
Methods of quantum chemistry have been applied to double-charged complexes involving the transition metals Ni2+, Cu2+ and Zn2+ with the aromatic amino acids (AAA) phenylalanine, tyrosine and tryptophan. The effect of hydration on the relative stability and geometry of the individual species studied has been evaluated within the supermolecule approach. The interaction enthalpies, entropies and Gibbs energies of nine complexes Phe•M, Tyr•M, Trp•M, (M = Ni2+, Cu2+ and Zn2+) were determined at the Becke3LYP density functional level of theory. Of the transition metals studied the bivalent copper cation forms the strongest complexes with AAAs. For Ni2+and Cu2+ the most stable species are the NO coordinated cations in the AAA metal complexes, Zn2+cation prefers a binding to the aromatic part of the AAA (complex II). Some complexes energetically unfavored in the gas-phase are stabilized upon microsolvation.
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94
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Sharma B, Rao JS, Sastry GN. Effect of Solvation on Ion Binding to Imidazole and Methylimidazole. J Phys Chem A 2011; 115:1971-84. [DOI: 10.1021/jp1120492] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Bhaskar Sharma
- Molecular Modeling Group, Organic Chemical Sciences, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 607, AP, India
| | - J. Srinivasa Rao
- Molecular Modeling Group, Organic Chemical Sciences, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 607, AP, India
| | - G. Narahari Sastry
- Molecular Modeling Group, Organic Chemical Sciences, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 607, AP, India
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95
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96
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Gaigeot MP. Infrared spectroscopy of the alanine dipeptide analog in liquid water with DFT-MD. Direct evidence for P(II)/beta conformations. Phys Chem Chem Phys 2010; 12:10198-209. [PMID: 20539891 DOI: 10.1039/c003485a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Following our previous work [J. Phys. Chem. B. Lett., 2009, 113, 10059], DFT-based molecular dynamics (DFTMD) simulations of 2-Ala peptide (i.e. Ac-Ala-NHMe dialanine peptide analog with methyl group caps at the extremities) immersed in liquid water at room temperature are reported. Our goal here is the theoretical calculation of the infrared spectrum of aqueous 2-Ala, in order to provide a definitive understanding of the average conformation adopted by this peptide in the liquid phase, taking into account solute and solvent at the same theoretical level of representation. We find that the experimental Amide I-II band predominantly results from a mixture of partially unfolded P(II) and unfolded beta conformational equilibrium of aqueous 2-Ala at room temperature.
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Affiliation(s)
- Marie-Pierre Gaigeot
- Université d'Evry val d'Essonne, LAMBE UMR8587 Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, Blvd F. Mitterrand, Bât. Maupertuis, 91025 Evry, France.
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97
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Prell JS, O'Brien JT, Williams ER. IRPD spectroscopy and ensemble measurements: effects of different data acquisition and analysis methods. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2010; 21:800-9. [PMID: 20185332 DOI: 10.1016/j.jasms.2010.01.010] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 01/06/2010] [Accepted: 01/10/2010] [Indexed: 05/17/2023]
Abstract
Three different commonly used infrared photodissociation (IRPD) spectroscopy acquisition and analysis methods are described, and results from these methods are compared using the same dataset for an extensively hydrated metal cation, La(3+)(H(2)O)(36). Using the first-order laser-induced photodissociation rate constant as an IRPD intensity has several advantages over photodissociation yield and depletion/appearance methods in that intensities can be more directly compared with calculated infrared absorption spectra, and the intensities can be readily corrected for changes in laser power or irradiation times used for optimum data acquisition at each frequency. Extending IRPD spectroscopy to large clusters can be complicated when blackbody infrared radiative dissociation competes strongly with laser-induced photodissociation. A new method to obtain IRPD spectra of single precursor ions or ensembles of precursor ions that is nearly equivalent to the photodissociation rate constant method for single precursor ions is demonstrated. The ensemble IRPD spectra represent the "average" structure of clusters of a given size range, and this method has the advantage that spectra with improved signal-to-noise ratios can be obtained with no increase in data acquisition time. Results using this new method for a precursor ensemble consisting of La(3+)(H(2)O)(35-37) are compared with results for La(3+)(H(2)O)(36).
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Affiliation(s)
- James S Prell
- Department of Chemistry, University of California, Berkeley, California 94720-1460, USA
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98
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Seidler P, Hansen MB, Győrffy W, Toffoli D, Christiansen O. Vibrational absorption spectra calculated from vibrational configuration interaction response theory using the Lanczos method. J Chem Phys 2010; 132:164105. [DOI: 10.1063/1.3391180] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99
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Gaigeot MP. Theoretical spectroscopy of floppy peptides at room temperature. A DFTMD perspective: gas and aqueous phase. Phys Chem Chem Phys 2010; 12:3336-59. [PMID: 20336243 DOI: 10.1039/b924048a] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Theoretical spectroscopy is mandatory for a precise understanding and assignment of experimental spectra recorded at finite temperature. We review here room temperature DFT-based molecular dynamics simulations for the purpose of interpreting finite temperature infrared spectra of peptides of increasing size and complexity, in terms of temperature-dependent conformational dynamics and flexibility, and vibrational anharmonicities (potential energy surface anharmonicities, vibrational mode couplings and dipole anharmonicities). We take examples from our research projects in order to illustrate the main key-points and strengths of dynamical spectra modeling in that context. The calculations are presented in relation to room temperature gas phase IR-MPD experiments and room temperature liquid phase IR absorption experiments. These illustrations of floppy polypeptides have been chosen in order to convey the following ideas: temperature-dependent spectra modeling is pivotal for a precise understanding of gas phase spectra recorded at room temperature, including conformational dynamics and vibrational anharmonicities; harmonic spectroscopy (as commonly performed in the literature) can be misleading and even erroneous for a proper interpretation of spectra recorded at finite temperature; taking into account vibrational anharmonicities is pivotal for a proper interplay between theory and experiments; amide I-III bands are not necessarily the most relevant fingerprints for unraveling the local structures of peptides and more complex systems; liquid phase simulations have unraveled relationships between the zwitterionic properties of the peptide bonds and infrared signatures. The review presents a state-of-the-art account of the domain and offers perspectives and new developments for future still more challenging applications.
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Affiliation(s)
- Marie-Pierre Gaigeot
- Université d'Evry val d'Essonne, LAMBE UMR8587 Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, Blvd F. Mitterrand, Bat Maupertuis, 91025 Evry, France.
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100
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Däschlein C, Bauer JO, Strohmann C. From the selective cleavage of the Si-O-Si bond in disiloxanes to zwitterionic, water-stable zinc silanolates. Angew Chem Int Ed Engl 2010; 48:8074-7. [PMID: 19780083 DOI: 10.1002/anie.200902318] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Christian Däschlein
- Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
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