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Khalil AM, Sabry OM, El-Askary HI, El Zalabani SM, Eltanany BM, Pont L, Benavente F, Elshewy A, Fayek NM. Identification of cyclooxygenase-II inhibitory saponins from fenugreek wastes: Insights from liquid chromatography-tandem mass spectrometry metabolomics, molecular networking, and molecular docking. PHYTOCHEMICAL ANALYSIS : PCA 2024; 35:690-707. [PMID: 38212263 DOI: 10.1002/pca.3322] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 11/19/2023] [Accepted: 12/16/2023] [Indexed: 01/13/2024]
Abstract
INTRODUCTION This research explores sustainable applications for waste generated from fenugreek (Trigonella foenum-graecum), a plant with both nutritional and medicinal uses. The study specifically targets waste components as potential sources of nutrients and bioactive compounds. OBJECTIVES The focus is to conduct detailed metabolic profiling of fenugreek waste, assess its anti-inflammatory properties by studying its cyclooxygenase (COX) inhibitory effect, and correlate this effect to the metabolite fingerprint. MATERIALS AND METHODS Ethanolic extracts of fenugreek fruit pericarp and a combination of leaves and stems were subjected to untargeted metabolic profiling using liquid chromatography-mass spectrometry integrated with online database searches and molecular networking as an effective dereplication strategy. The study also scrutinized the COX inhibitory capabilities of these extracts and saponin-rich fractions prepared therefrom. Molecular docking was employed to investigate the specific interactions between the identified saponins and COX enzymes. RESULTS The analysis led to the annotation of 81 metabolites, among which saponins were predominant. The saponin-rich fraction of the fruit pericarp extract displayed the strongest COX-II inhibitory activity in the in vitro inhibition assay (IC50 value of 81.64 ± 3.98 μg/mL). The molecular docking study supported the selectivity of the identified saponins towards COX-II. The two major identified saponins, namely, proto-yamogenin 3-O-[deoxyhexosyl (1 → 2)] [hexosyl (1 → 4)] hexoside 26-O-hexoside and trigofenoside A, were predicted to have the highest affinity to the COX-II receptor site. CONCLUSION In the present study, we focused on the identification of COX-II inhibitory saponins in fenugreek waste through an integrated approach. The findings offer valuable insights into potential anti-inflammatory and cancer chemoprotective applications of fenugreek waste.
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Affiliation(s)
- Asmaa M Khalil
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Omar M Sabry
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
- Department of Pharmacognosy, Faculty of Pharmacy, Heliopolis University, Cairo, Egypt
| | - Hesham I El-Askary
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Soheir M El Zalabani
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Basma M Eltanany
- Department of Analytical Chemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Laura Pont
- Department of Chemical Engineering and Analytical Chemistry, Institute for Research on Nutrition and Food Safety (INSA-UB), University of Barcelona, Barcelona, Spain
- Serra Húnter Program, Generalitat de Catalunya, Barcelona, Spain
| | - Fernando Benavente
- Department of Chemical Engineering and Analytical Chemistry, Institute for Research on Nutrition and Food Safety (INSA-UB), University of Barcelona, Barcelona, Spain
| | - Ahmed Elshewy
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt
- Department of Medicinal Chemistry, Faculty of Pharmacy, Galala University, New Galala, Egypt
| | - Nesrin M Fayek
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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2
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Salvi M, Uma NN, Dinesan H, Roy A, Kumar SS. A versatile 16-pole ion trap setup for investigating photophysics of biomolecular ions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:093203. [PMID: 37721505 DOI: 10.1063/5.0160407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 08/26/2023] [Indexed: 09/19/2023]
Abstract
A linear 16-pole ion trap-based experimental setup has been designed, implemented, and characterized to investigate the photophysics of biomolecules in the gas phase. Electrospray ionization is employed to generate the ions in the gas phase at atmospheric pressure. The voltage configuration on the ion funnel, the ion optic device in the first vacuum interface, is used to control the energy of the ions. A home-built quadrupole mass-filter is utilized for the mass-selection of the ions of interest. A 16-pole ion trap designed and built in-house is implemented for ion trapping. The instrument's versatility and capability are showcased by demonstrating the fragmentation patterns of protonated and deprotonated tryptophan, as well as describing the photodetachment decay of deprotonated indole.
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Affiliation(s)
- M Salvi
- Department of Physics and the Center for Atomic, Molecular, and Optical Sciences & Technologies (CAMOST), Indian Institute of Science Education and Research Tirupati, AP, Tirupati 517507, India
| | - N N Uma
- Department of Physics and the Center for Atomic, Molecular, and Optical Sciences & Technologies (CAMOST), Indian Institute of Science Education and Research Tirupati, AP, Tirupati 517507, India
| | - Hemanth Dinesan
- CNRS Laboratoire de Physique des Lasers (LPL), Université Sorbonne Paris Nord Villetaneuse, Villetaneuse 93430, France
| | - Abheek Roy
- Department of Physics and the Center for Atomic, Molecular, and Optical Sciences & Technologies (CAMOST), Indian Institute of Science Education and Research Tirupati, AP, Tirupati 517507, India
| | - S Sunil Kumar
- Department of Physics and the Center for Atomic, Molecular, and Optical Sciences & Technologies (CAMOST), Indian Institute of Science Education and Research Tirupati, AP, Tirupati 517507, India
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3
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Armentrout PB. Energetics and mechanisms for decomposition of cationized amino acids and peptides explored using guided ion beam tandem mass spectrometry. MASS SPECTROMETRY REVIEWS 2023; 42:928-953. [PMID: 34392555 DOI: 10.1002/mas.21723] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 07/22/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
Fragmentation studies of cationized amino acids and small peptides as studied using guided ion beam tandem mass spectrometry (GIBMS) are reviewed. After a brief examination of the key attributes of the GIBMS approach, results for a variety of systems are examined, compared, and contrasted. Cationization of amino acids, diglycine, and triglycine with alkali cations generally leads to dissociations in which the intact biomolecule is lost. Exceptions include most lithiated species as well as a few examples for sodiated and one example for potassiated species. Like the lithiated species, cationization by protons leads to numerous dissociation channels. Results for protonated glycine, cysteine, asparagine, diglycine, and a series of tripeptides are reviewed, along with the thermodynamic consequences that can be gleaned. Finally, the important physiological process of the deamidation of asparagine (Asn) residues is explored by the comparison of five dipeptides in which the C-terminal partner (AsnXxx) is altered. The GIBMS thermochemistry is shown to correlate well with kinetic results from solution phase studies.
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Affiliation(s)
- P B Armentrout
- Department of Chemistry, University of Utah, Salt Lake City, Utah, USA
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4
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Molina F, Dezalay J, Tabata JI, Soorkia S, Broquier M, Hirata K, Ishiuchi SI, Fujii M, Grégoire G. Conformer-selective Photodynamics of TrpH + -H 2 O. Chemphyschem 2023; 24:e202200561. [PMID: 36177693 PMCID: PMC10092157 DOI: 10.1002/cphc.202200561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/06/2022] [Indexed: 01/20/2023]
Abstract
The photodynamics of protonated tryptophan and its mono hydrated complex TrpH+ -H2 O has been revisited. A combination of steady-state IR and UV cryogenic ion spectroscopies with picosecond pump-probe photodissociation experiments sheds new lights on the deactivation processes of TrpH+ and conformer-selected TrpH+ -H2 O complex, supported by quantum chemistry calculations at the DFT and coupled-cluster levels for the ground and excited states, respectively. TrpH+ excited at the band origin exhibits a transient of less than 100 ps, assigned to the lifetime of the excited state proton transfer (ESPT) structure. The two experimentally observed conformers of TrpH+ -H2 O have been assigned. A striking result arises from the conformer-selective photodynamics of TrpH+ -H2 O, in which a single water molecule inserted in between the ammonium and the indole ring hinders the barrierless ESPT reaction responsible for the ultra-fast deactivation process observed in the other conformer and in bare TrpH+ .
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Affiliation(s)
- Franco Molina
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France.,INFIQC (CONICET-UNC). Departamento de Fisicoquímica, Fac. de Ciencias Químicas. Centro Láser de Ciencias Moleculares., Universidad Nacional de Córdoba, Ciudad Universitaria Pabellón Argentina, X5000HUA, Córdoba, Argentina
| | - Jordan Dezalay
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France
| | - Jun-Ichi Tabata
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsu-ta-cho, Midori-ku, Yokohama, 226-8503, Japan.,School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsu-ta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Satchin Soorkia
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France
| | - Michel Broquier
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France
| | - Keisuke Hirata
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsu-ta-cho, Midori-ku, Yokohama, 226-8503, Japan.,Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 4259 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.,Tokyo Tech World Research Hub Initiative (WRHI), Institute of Innovation Research, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Shun-Ichi Ishiuchi
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsu-ta-cho, Midori-ku, Yokohama, 226-8503, Japan.,Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 4259 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.,Tokyo Tech World Research Hub Initiative (WRHI), Institute of Innovation Research, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Masaaki Fujii
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsu-ta-cho, Midori-ku, Yokohama, 226-8503, Japan.,Tokyo Tech World Research Hub Initiative (WRHI), Institute of Innovation Research, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan.,School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsu-ta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Gilles Grégoire
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France.,Tokyo Tech World Research Hub Initiative (WRHI), Institute of Innovation Research, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
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Zheng M, Zhang X, Cheng Y, Sun L, Zhang X. Hydroxyl transfer versus cyclization reaction in the gas phase: Sequential loss of NH 3 and CH 2CO from protonated phenylalanine derivatives. Front Chem 2023; 10:1094329. [PMID: 36700082 PMCID: PMC9868239 DOI: 10.3389/fchem.2022.1094329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 12/23/2022] [Indexed: 01/10/2023] Open
Abstract
Collisional activation of protonated phenylalanine derivatives deamination products leads to hydroxyl skeletal rearrangement versus cyclization reaction, and to form hydroxylbenzyl cation via elimination of CH2CO. To better clarify this unusual fragmentation reaction, accurate mass measurements experiments, native isotope experiments, multiple-stage mass spectrometry experiments, different substituents experiments, and density functional theory (DFT) calculations were carried out to investigate the dissociation mechanistic pathways of protonated phenylalanine derivatives deamination products. In route 1, a three-membered ring-opening reaction and a 1,3-hydroxyl transfer (from the carbonyl carbon atom to the interposition carbon atom of carbonyl) occurs to form 3-hydroxy-1-oxo-3-phenylpropan-1-ylium, followed by dissociation to lose CH2CO to give hydroxy (phenyl)methylium. In route 2, a successive cyclization rearrangement reaction and proton transfer occur to form a 2-hydroxylphenylpropionyl cation or protonated 2-hydroxy-4H-benzopyran, followed by dissociation to lose CH2CO or CH≡COH to give 2-hydroxylbenzyl cation. In route 3, a successive hydroxyl transfer (from the carbonyl carbon atom to the ortho carbon atom on benzene) and two stepwise proton transfer (1,2-proton transfer to the ipso-carbon atom of the phenyl ring followed by 1,3-proton transfer to the ortho carbon atom of carbonyl) occurs to form a 2-hydroxylphenylpropionyl cation, which subsequently dissociates to form 2-hydroxylbenzyl cation by elimination of CH2CO. DFT calculations suggested that route 1 was more favorable than route 2 and route 3 from a thermodynamic point of view.
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Hervé M, Boyer A, Brédy R, Compagnon I, Allouche AR, Lépine F. Controlled ultrafast ππ*-πσ* dynamics in tryptophan-based peptides with tailored micro-environment. Commun Chem 2021; 4:124. [PMID: 36697624 PMCID: PMC9814788 DOI: 10.1038/s42004-021-00557-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 07/26/2021] [Indexed: 01/28/2023] Open
Abstract
Ultrafast charge, energy and structural dynamics in molecules are driven by the topology of the multidimensional potential energy surfaces that determines the coordinated electronic and nuclear motion. These processes are also strongly influenced by the interaction with the molecular environment, making very challenging a general understanding of these dynamics on a microscopic level. Here we use electrospray and mass spectrometry technologies to produce isolated molecular ions with a controlled micro-environment. We measure ultrafast photo-induced ππ*-πσ* dynamics in tryptophan species in the presence of a single, charged adduct. A striking increase of the timescale by more than one order of magnitude is observed when changing the added adduct atom. A model is proposed to rationalize the results, based on the localized and delocalized effects of the adduct on the electronic structure of the molecule. These results offer perspectives to control ultrafast molecular processes by designing the micro-environment on the Angström length scale.
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Affiliation(s)
- Marius Hervé
- grid.436142.60000 0004 0384 4911Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
| | - Alexie Boyer
- grid.436142.60000 0004 0384 4911Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
| | - Richard Brédy
- grid.436142.60000 0004 0384 4911Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
| | - Isabelle Compagnon
- grid.436142.60000 0004 0384 4911Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
| | - Abdul-Rahman Allouche
- grid.436142.60000 0004 0384 4911Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
| | - Franck Lépine
- grid.436142.60000 0004 0384 4911Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
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7
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Naha A, Jha SK, Singh HR, Sampath MK. Kinetic modeling and statistical optimization of submerged production of anti-Parkinson's prodrug L-DOPA by Pseudomonas fluorescens. Prep Biochem Biotechnol 2021; 52:331-343. [PMID: 34283005 DOI: 10.1080/10826068.2021.1945624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
L-DOPA, a precursor of dopamine, is the drug of choice for Parkinson's disease, which persists due to decreased levels of dopamine in the brain. Present study emphasis the microbial production of L-DOPA rather than the biotransformation of L-DOPA by L-tyrosine. The production of L-DOPA by bacterial isolates had gained more acceptance due to its more straightforward extraction and downstream processes. Pseudomonas fluorescens was used to produce the L-DOPA in a bioreactor system under submerged condition. The design of experiment-based Taguchi orthogonal array method was adopted for the optimization of production. L-9 orthogonal array using the analysis of mean approach was used to study the effect of different factors viz NaCl, lactose, tryptone, and inducer on the microbial production of L-DOPA. The method mentioned above is less time consuming and does not require any harsh chemicals, proving it to be an eco-friendly process. After optimizing selected factors, i.e., NaCl (1.2 g/l), lactose (1.5 g/l), tryptone (4 g/l), and inducer (0.1 g/l), 16.9 % of enhancement in L-DOPA production with 66.6% of process cost saving was observed. The production of L-DOPA was increased from 3.426 ± 0.08 g/l to 4.123 ± 0.05 g/l after optimization. Subsequently, unstructured kinetic models were adopted to simulate the fermentation kinetics and understand the metabolic process. Fisher' F test and determination coefficients (R2) confirmed that the Velhurst-Pearl logistic equation, Luedeking-Piret equation, and modified Luedeking-Piret equation was best fitted with the biomass production, product formation, and substrate utilization, respectively.
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Affiliation(s)
- Ananya Naha
- Department of Bioengineering, Birla Institute of Technology, Mesra, Ranchi, India
| | - Santosh Kumar Jha
- Department of Bioengineering, Birla Institute of Technology, Mesra, Ranchi, India
| | - Hare Ram Singh
- Department of Bioengineering, Birla Institute of Technology, Mesra, Ranchi, India
| | - Muthu Kumar Sampath
- Department of Bioengineering, Birla Institute of Technology, Mesra, Ranchi, India
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8
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Murashima H, Fujihara A. Quantification of monosaccharide enantiomers using optical properties of hydrogen-bonded tryptophan. Anal Biochem 2021; 619:114151. [PMID: 33684343 DOI: 10.1016/j.ab.2021.114151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 01/22/2021] [Accepted: 03/01/2021] [Indexed: 10/22/2022]
Abstract
Chiral recognition between amino acids and monosaccharides in the gas phase was investigated as a model for chemical evolution in interstellar molecular clouds. Ultraviolet (UV) photodissociation spectra and product ion spectra of cold gas-phase hydrogen-bonded clusters of protonated tryptophan (Trp) and a pentose, including ribose and arabinose, were obtained using a tandem mass spectrometer equipped with an electrospray ionization source and a temperature-controlled ion trap. The relative intensity of the signal arising from the S1-S0 transition of protonated Trp observed at approximately 285 nm in the UV photodissociation spectrum of homochiral H+(d-Trp)(d-ribose) was significantly higher than that of heterochiral H+(l-Trp)(d-ribose), corresponding to the ππ* state of the Trp indole ring. Optical properties of Trp in the clusters induced by 285-nm photoexcitation were applied to the identification and quantification of pentose enantiomers in solution. Pentose enantiomeric excess in solution was determined from relative abundances observed in a single product ion spectrum of 285-nm photoexcited hydrogen-bonded clusters of H+(l-Trp) and pentose. A mixture of two pentoses could also be quantified by this method. The geometric and electronic structures of Trp enable recognition of biological molecules through hydrogen bonding.
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Affiliation(s)
- Hiromori Murashima
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Osaka, 599-8531, Japan
| | - Akimasa Fujihara
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Osaka, 599-8531, Japan.
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9
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Murashima H, Fujihara A. Wavelength dependence of chiral recognition using ions between photoexcited tryptophan and sugars. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110818] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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10
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Mamani-Huanca M, Gradillas A, Gil de la Fuente A, López-Gonzálvez Á, Barbas C. Unveiling the Fragmentation Mechanisms of Modified Amino Acids as the Key for Their Targeted Identification. Anal Chem 2020; 92:4848-4857. [DOI: 10.1021/acs.analchem.9b04313] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Maricruz Mamani-Huanca
- Centre for Metabolomics and Bioanalysis (CEMBIO), Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Madrid, Spain
| | - Ana Gradillas
- Centre for Metabolomics and Bioanalysis (CEMBIO), Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Madrid, Spain
| | - Alberto Gil de la Fuente
- Centre for Metabolomics and Bioanalysis (CEMBIO), Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Madrid, Spain
- Department of Information Technology, Escuela Politécnica Superior, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Madrid, Spain
| | - Ángeles López-Gonzálvez
- Centre for Metabolomics and Bioanalysis (CEMBIO), Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Madrid, Spain
| | - Coral Barbas
- Centre for Metabolomics and Bioanalysis (CEMBIO), Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Madrid, Spain
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11
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Rebrov O, Poline M, Ryding MJ, Thomas RD, Uggerud E, Larsson M. Non-covalently bonded diastereomeric adducts of amino acids and (S)-1-phenylethanol in low-energy dissociative collisions. Mol Phys 2020. [DOI: 10.1080/00268976.2019.1615145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- O. Rebrov
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm, Sweden
| | - M. Poline
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm, Sweden
| | - M. J. Ryding
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, Oslo, Norway
| | - R. D. Thomas
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm, Sweden
| | - E. Uggerud
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, Oslo, Norway
| | - M. Larsson
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm, Sweden
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Ochola J, Cortada L, Ng’ang’a M, Hassanali A, Coyne D, Torto B. Mediation of Potato-Potato Cyst Nematode, G. rostochiensis Interaction by Specific Root Exudate Compounds. FRONTIERS IN PLANT SCIENCE 2020; 11:649. [PMID: 32587595 PMCID: PMC7298108 DOI: 10.3389/fpls.2020.00649] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 04/27/2020] [Indexed: 05/03/2023]
Abstract
Potato (Solanum tuberosum) is a widely consumed staple food crop worldwide whose production is threatened by potato cyst nematodes (PCN). To infect a host, PCN eggs first need to be stimulated to hatch by chemical components in the host root exudates, yet it remains unknown how most root exudate components influence PCN behavior. Here, we evaluated the influence of eight compounds identified by LC-QqQ-MS in the root exudate of potato on the hatching response of the PCN, Globodera rostochiensis at varying doses. The eight compounds included the amino acids tyrosine, tryptophan and phenylalanine; phytohormones zeatin and methyl dihydrojasmonate; steroidal glycoalkaloids α-solanine and α-chaconine and the steroidal alkaloid solanidine. We additionally tested two other Solanaceae steroidal alkaloids, solasodine and tomatidine, previously identified in the root exudates of tomato, an alternative host for PCN. In dose-response assays with the individual compounds, the known PCN hatching factors α-chaconine and α-solanine stimulated the highest number of eggs to hatch, ∼47 and ∼42%, respectively, whereas the steroidal alkaloids (aglycones), solanidine and solasodine and potato root exudate (PRE) were intermediate, 28% each and 21%, respectively, with tomatidine eliciting the lowest hatching response 13%. However, ∼60% of the hatched juveniles failed to emerge from the cyst, which was compound- and concentration-dependent. The amino acids, phytohormones and the negative control (1% DMSO in water), however, were generally non-stimulatory. The use of steroidal glycoalkaloids and their aglycones in the suicidal hatching of PCN offers promise as an environmentally sustainable approach to manage this pest.
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Affiliation(s)
- Juliet Ochola
- Behavioural and Chemical Ecology Unit, International Centre of Insect Physiology and Ecology, Nairobi, Kenya
- Department of Chemistry, Kenyatta University, Nairobi, Kenya
| | - Laura Cortada
- Nematology Research Unit, Department of Biology, Ghent University, Ghent, Belgium
- International Institute of Tropical Agriculture, Nairobi, Kenya
| | | | - Ahmed Hassanali
- Department of Chemistry, Kenyatta University, Nairobi, Kenya
| | - Danny Coyne
- International Institute of Tropical Agriculture, Nairobi, Kenya
| | - Baldwyn Torto
- Behavioural and Chemical Ecology Unit, International Centre of Insect Physiology and Ecology, Nairobi, Kenya
- *Correspondence: Baldwyn Torto,
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Nwabufo CK, El-Aneed A, Krol ES. Tandem mass spectrometric analysis of novel caffeine scaffold-based bifunctional compounds for Parkinson's disease. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2019; 33:1792-1803. [PMID: 31351020 DOI: 10.1002/rcm.8540] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 07/19/2019] [Accepted: 07/20/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Novel bifunctional compounds composed of a caffeine scaffold attached to nicotine (C8 -6-N), 1-aminoindan (C8 -6-I), or caffeine (C8 -6-C8 ) were designed as therapeutics or diagnostics for Parkinson's disease (PD). In order to probe their pharmacological and toxicological profile, an appropriate analytical method is required. The goal of this study is to establish a tandem mass spectrometric fingerprint for the development of quantitative and qualitative methods that will aid future assessment of the in vitro and in vivo absorption, distribution, metabolism, excretion (ADME) and pharmacokinetic properties of these lead bifunctional compounds for PD. METHODS Accurate mass measurement was performed using a hybrid quadrupole orthogonal time-of-flight mass spectrometer while multistage MS/MS and MS3 analyses were conducted using a triple quadrupole linear ion trap mass spectrometer. Both instruments are equipped with an electrospray ionization (ESI) source and were operated in the positive ion mode. The source and compound parameters were optimized for all three tested bifunctional compounds. RESULTS The MS/MS analysis indicates that the fragmentation of C8 -6-N and C8 -6-I is driven by the dissociation of the nicotine and 1-aminoindan moieties, respectively, but not caffeine. A significant observation in the MS/MS fragmentation of C8 -6-C8 suggests that a previously reported loss of acetaldehyde during caffeine dissociation is instead a loss of CO2 . CONCLUSIONS The collision-induced tandem mass spectrometry (CID-MS/MS) analysis of these novel bifunctional compounds revealed compound-specific diagnostic product ions and neutral losses for all three tested bifunctional compounds. The established MS/MS fingerprint will be applied to the future development of qualitative and quantitative methods.
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Affiliation(s)
- Chukwunonso K Nwabufo
- Drug Discovery and Development Research Group, College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, SK, Canada
| | - Anas El-Aneed
- Drug Discovery and Development Research Group, College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, SK, Canada
| | - Ed S Krol
- Drug Discovery and Development Research Group, College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, SK, Canada
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14
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Soorkia S, Jouvet C, Grégoire G. UV Photoinduced Dynamics of Conformer-Resolved Aromatic Peptides. Chem Rev 2019; 120:3296-3327. [DOI: 10.1021/acs.chemrev.9b00316] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Satchin Soorkia
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Christophe Jouvet
- CNRS, Aix Marseille Université, PIIM UMR 7345, 13397, Marseille, France
| | - Gilles Grégoire
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
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15
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Nguyen DT, Oki N, Fujihara A. Determination of enantiomeric excess of amino acids using photodissociation of cold gas-phase Na + -containing clusters. JOURNAL OF MASS SPECTROMETRY : JMS 2019; 54:629-633. [PMID: 31094029 DOI: 10.1002/jms.4373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/15/2019] [Accepted: 05/01/2019] [Indexed: 06/09/2023]
Affiliation(s)
- Doan Thuc Nguyen
- Department of Chemistry, Osaka Prefecture University, Osaka, 599-8531, Japan
| | - Narumi Oki
- Department of Chemistry, Osaka Prefecture University, Osaka, 599-8531, Japan
| | - Akimasa Fujihara
- Department of Chemistry, Osaka Prefecture University, Osaka, 599-8531, Japan
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16
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Zhang P, Chan W, Ang IL, Wei R, Lam MMT, Lei KMK, Poon TCW. Revisiting Fragmentation Reactions of Protonated α-Amino Acids by High-Resolution Electrospray Ionization Tandem Mass Spectrometry with Collision-Induced Dissociation. Sci Rep 2019; 9:6453. [PMID: 31015571 PMCID: PMC6478932 DOI: 10.1038/s41598-019-42777-8] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 04/08/2019] [Indexed: 12/23/2022] Open
Abstract
Fragmentation reactions of protonated α-amino acids (AAs) were studied previously using tandem mass spectrometry (MS/MS) of unit mass resolution. Isobaric fragmentation products and minor fragmentation products could have been overlooked or misannotated. In the present study, we examined the fragmentation patterns of 19 AAs using high-resolution electrospray ionization MS/MS (HR-ESI-MS/MS) with collision-induced dissociation (CID). Isobaric fragmentation products from protonated Met and Trp were resolved and identified for the first time. Previously unreported fragmentation products from protonated Met, Cys, Gln, Arg, and Lys were observed. Additionally, the chemical identity of a fragmentation product from protonated Trp that was incorrectly annotated in previous investigations was corrected. All previously unreported fragmentation products and reactions were verified by pseudo MS3 experiments and/or MS/MS analyses of deuterated AAs. Clearer pictures of the fragmentation reactions for Met, Cys, Trp, Gln, Arg and Lys were obtained in the present study.
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Affiliation(s)
- Pengwei Zhang
- Pilot Laboratory, Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Macau, China
| | - Wan Chan
- Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China
| | - Irene L Ang
- Pilot Laboratory, Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Macau, China
| | - Rui Wei
- Pilot Laboratory, Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Macau, China
| | - Melody M T Lam
- Proteomics Core, Faculty of Health Sciences, University of Macau, Macau, China
| | - Kate M K Lei
- Pilot Laboratory, Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Macau, China
| | - Terence C W Poon
- Pilot Laboratory, Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Macau, China.
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17
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Sommer T, Dlugash G, Hübner H, Gmeiner P, Pischetsrieder M. Monitoring of the dopamine D2 receptor agonists hordenine and N-methyltyramine during the brewing process and in commercial beer samples. Food Chem 2019; 276:745-753. [DOI: 10.1016/j.foodchem.2018.10.067] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 10/09/2018] [Accepted: 10/12/2018] [Indexed: 01/17/2023]
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18
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Nguyen DT, Fujihara A. Chiral Recognition in Cold Gas-Phase Cluster Ions of Carbohydrates and Tryptophan Probed by Photodissociation. ORIGINS LIFE EVOL B 2018; 48:395-406. [PMID: 30953250 DOI: 10.1007/s11084-019-09574-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 03/19/2019] [Indexed: 12/20/2022]
Abstract
Chiral recognition between tryptophan (Trp) and carbohydrates such as D-glucose (D-Glc), methyl-α-D-glucoside (D-glucoside), D-maltose, and D-cellobiose in cold gas-phase cluster ions was investigated as a model for chemical evolution in interstellar molecular clouds using a tandem mass spectrometer containing a cold ion trap. The photodissociation mass spectra of cold gas-phase clusters that contained Na+, Trp enantiomers, and D-maltose showed that Na+(D-Glc) was formed via the glycosidic bond cleavage of D-maltose from photoexcited homochiral Na+(D-Trp)(D-maltose), while the dissociation did not occur in heterochiral Na+(L-Trp)(D-maltose). The enantiomer-selective dissociation was also observed in the case of D-cellobiose. The enantiomer-selective glycosidic bond cleavage of disaccharides suggested that photoexcited D-Trp could prevent chemical evolution of sugar chains from D-enantiomer of carbohydrates in molecular clouds. The spectra of gas-phase clusters that contained Na+, Trp enantiomers, and D-Glc indicated that enantiomer-selective protonation of L-Trp from D-Glc could induce enantiomeric excess via collision-activated dissociation of the protonated L-Trp. In the case of protonated clusters, photoexcited H+(L-Trp) dissociated via Cα-Cβ bond cleavage in the presence of D-Glc or D-glucoside, where the excited states of H+(L-Trp) contributed to the enantiomer-selective reaction in the clusters. These enantiomer selectivities in cold gas-phase clusters indicated that chirality of a molecule induced enantiomeric excess of other molecules via enantiomer-selective reactions in molecular clouds.
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Affiliation(s)
- Doan Thuc Nguyen
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Osaka, 599-8531, Japan
| | - Akimasa Fujihara
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Osaka, 599-8531, Japan.
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Klarskov K, Gagnon H, Racine M, Boudreault PL, Normandin C, Marsault E, Gleich GJ, Naylor S. Peak AAA fatty acid homolog contaminants present in the dietary supplement l-Tryptophan associated with the onset of eosinophilia-myalgia syndrome. Toxicol Lett 2018; 294:193-204. [PMID: 29800716 DOI: 10.1016/j.toxlet.2018.05.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 05/08/2018] [Accepted: 05/22/2018] [Indexed: 12/17/2022]
Abstract
The eosinophilia-myalgia syndrome (EMS) outbreak that occurred in the USA and elsewhere in 1989 was caused by the ingestion of Showa Denko K.K. (SD) L-tryptophan (L-Trp). "Six compounds" detected in the L-Trp were reported as case-associated contaminants. Recently the final and most statistically significant contaminant, "Peak AAA" was structurally characterized. The "compound" was actually shown to be two structural isomers resulting from condensation reactions of L-Trp with fatty acids derived from the bacterial cell membrane. They were identified as the indole C-2 anteiso (AAA1-343) and linear (AAA2-343) aliphatic chain isomers. Based on those findings, we utilized a combination of on-line HPLC-electrospray ionization mass spectrometry (LC-MS), as well as both precursor and product ion tandem mass spectrometry (MS/MS) to facilitate identification of a homologous family of condensation products related to AAA1-343 and AAA2-343. We structurally characterized eight new AAA1-XXX/AAA2-XXX contaminants, where XXX represents the integer molecular ions of all the related homologs, differing by aliphatic chain length and isomer configuration. The contaminants were derived from the following fatty acids of the bacterial cell membrane, 5-methylheptanoic acid (anteiso-C8:0) for AAA1-315; n-octanoic acid (n-C8:0) for AAA2-315; 6-methyloctanoic acid (anteiso-C9:0) for AAA1-329; n-nonanoic acid (n-C9:0) for AAA2-329; 10-methyldodecanoic acid (anteiso-C13:0) for AAA1-385; n-tridecanoic acid (n-C13:0) for AAA2-385; 11-methyltridecanoic acid (anteiso-C14:0) for AAA1-399; and n-tetradecanoic acid (n-C14:0) for AAA2-399. The concentration levels for these contaminants were estimated to be 0.1-7.9 μg / 500 mg of an individual SD L-Trp tablet or capsule The structural similarity of these homologs to case-related contaminants of Spanish Toxic Oil Syndrome (TOS) is discussed.
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Affiliation(s)
- Klaus Klarskov
- Laboratory of Mass Spectrometry and Xenobiotics, Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada
| | - Hugo Gagnon
- PhenoSwitch Bioscience, Sherbrooke, Quebec J1H 5N4, Canada
| | - Mathieu Racine
- PhenoSwitch Bioscience, Sherbrooke, Quebec J1H 5N4, Canada
| | - Pierre-Luc Boudreault
- Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada
| | - Chad Normandin
- Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada
| | - Eric Marsault
- Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada
| | - Gerald J Gleich
- Departments of Dermatology and Medicine, School of Medicine, University of Utah, Salt Lake City, UT, 84132, USA
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Ranka K, Zhao N, Yu L, Stanton JF, Polfer NC. Radical Rearrangement Chemistry in Ultraviolet Photodissociation of Iodotyrosine Systems: Insights from Metastable Dissociation, Infrared Ion Spectroscopy, and Reaction Pathway Calculations. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2018; 29:1791-1801. [PMID: 29845561 DOI: 10.1007/s13361-018-1959-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 03/21/2018] [Accepted: 04/01/2018] [Indexed: 06/08/2023]
Abstract
We report on the ultraviolet photodissociation (UVPD) chemistry of protonated tyrosine, iodotyrosine, and diiodotyrosine. Distonic loss of the iodine creates a high-energy radical at the aromatic ring that engages in hydrogen/proton rearrangement chemistry. Based on UVPD kinetics measurements, the appearance of this radical is coincident with the UV irradiation pulse (8 ns). Conversely, sequential UVPD product ions exhibit metastable decay on ca. 100 ns timescales. Infrared ion spectroscopy is capable of confirming putative structures of the rearrangement products as proton transfers from the imine and β-carbon hydrogens. Potential energy surfaces for the various reaction pathways indicate that the rearrangement chemistry is highly complex, compatible with a cascade of rearrangements, and that there is no preferred rearrangement pathway even in small molecular systems like these. Graphical Abstract.
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Affiliation(s)
- Karnamohit Ranka
- Quantum Theory Project, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, FL, 32611-7200, USA
- Quantum Theory Project, Department of Physics, University of Florida, P.O. Box 118435, Gainesville, FL, 32611-8435, USA
| | - Ning Zhao
- Department of Chemistry and Center for Chemical Physics, University of Florida, P.O. Box 117200, Gainesville, FL, 32611-7200, USA
| | - Long Yu
- Department of Chemistry and Center for Chemical Physics, University of Florida, P.O. Box 117200, Gainesville, FL, 32611-7200, USA
| | - John F Stanton
- Quantum Theory Project, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, FL, 32611-7200, USA
- Quantum Theory Project, Department of Physics, University of Florida, P.O. Box 118435, Gainesville, FL, 32611-8435, USA
| | - Nicolas C Polfer
- Department of Chemistry and Center for Chemical Physics, University of Florida, P.O. Box 117200, Gainesville, FL, 32611-7200, USA.
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21
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Khreis JM, Reitshammer J, Vizcaino V, Klawitter K, Feketeová L, Denifl S. High-energy collision-induced dissociation of histidine ions [His + H] + and [His - H] - and histidine dimer [His 2 + H] . RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:113-120. [PMID: 29108138 DOI: 10.1002/rcm.8027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 10/05/2017] [Accepted: 10/26/2017] [Indexed: 06/07/2023]
Abstract
RATIONALE Histidine (His) is an essential amino acid, whose side group consists of an aromatic imidazole moiety that can bind a proton or metal cation and act as a donor in intermolecular interactions in many biological processes. While the dissociation of His monomer ions is well known, information on the kinetic energy released in the dissociation is missing. METHODS Using a new home-built electrospray ionization (ESI) source adapted to a double-focusing mass spectrometer of BE geometry, we investigated the fragmentation reactions of protonated and deprotonated His, [His + H]+ and [His - H]- , and the protonated His dimer [His2 + H]+ , accelerated to 6 keV in a high-energy collision with helium gas. We evaluated the kinetic energy release (KER) for the observed dissociation channels. RESULTS ESI of His solution in positive mode led to the formation of His clusters [Hisn + H]+ , n = 1-6, with notably enhanced stability of the tetramer. [His + H]+ dissociates predominantly by loss of (H2 O + CO) with a KER of 278 meV, while the dominant dissociation channel of [His - H]- involves loss of NH3 with a high KER of 769 meV. Dissociation of [His2 + H]+ is dominated by loss of the monomer but smaller losses are also observed. CONCLUSIONS The KER for HCOOH loss from both [His + H]+ and [His - H]- is similar at 278 and 249 meV, respectively, which suggests that the collision-induced dissociation takes place via a similar mechanism. The loss of COOH and C2 H5 NO2 from the dimer suggests that the dimer of His binds through a shared proton between the imidazole moieties.
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Affiliation(s)
- Jusuf M Khreis
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Leopold Franzens Universität Innsbruck, Technikerstrasse 25, 6020, Innsbruck, Austria
| | - Julia Reitshammer
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Leopold Franzens Universität Innsbruck, Technikerstrasse 25, 6020, Innsbruck, Austria
| | | | - Kevin Klawitter
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Leopold Franzens Universität Innsbruck, Technikerstrasse 25, 6020, Innsbruck, Austria
| | - Linda Feketeová
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Leopold Franzens Universität Innsbruck, Technikerstrasse 25, 6020, Innsbruck, Austria
- Université de Lyon, Université Claude Bernard Lyon1, CNRS/IN2P3, UMR5822, Institut de Physique Nucléaire de Lyon, 43 Bd du 11 novembre 1918, 69622, Villeurbanne, France
| | - Stephan Denifl
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Leopold Franzens Universität Innsbruck, Technikerstrasse 25, 6020, Innsbruck, Austria
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22
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Fujihara A, Inoue H, Sogi M, Tajiri M, Wada Y. Chiral and Molecular Recognition through Protonation between Aromatic Amino Acids and Tripeptides Probed by Collision-Activated Dissociation in the Gas Phase. Molecules 2018; 23:molecules23010162. [PMID: 29342843 PMCID: PMC6017851 DOI: 10.3390/molecules23010162] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 01/06/2018] [Accepted: 01/11/2018] [Indexed: 01/14/2023] Open
Abstract
Chiral and molecular recognition through protonation was investigated through the collision-activated dissociation (CAD) of protonated noncovalent complexes of aromatic amino acid enantiomers with l-alanine- and l-serine-containing tripeptides using a linear ion trap mass spectrometer. In the case of l-alanine-tripeptide (AAA), NH₃ loss was observed in the CAD of heterochiral H⁺(d-Trp)AAA, while H₂O loss was the main dissociation pathways for l-Trp, d-Phe, and l-Phe. The protonation site of heterochiral H⁺(d-Trp)AAA was the amino group of d-Trp, and the NH₃ loss occurred from H⁺(d-Trp). The H₂O loss indicated that the proton was attached to the l-alanine tripeptide in the noncovalent complexes. With the substitution of a central residue of l-alanine tripeptide to l-Ser, ASA recognized l-Phe by protonation to the amino group of l-Phe in homochiral H⁺(l-Phe)ASA. For the protonated noncovalent complexes of His enantiomers with tripeptides (AAA, SAA, ASA, and AAS), protonated His was observed in the spectra, except for those of heterochiral H⁺(d-His)SAA and H⁺(d-His)AAS, indicating that d-His did not accept protons from the SAA and AAS in the noncovalent complexes. The amino-acid sequences of the tripeptides required for the recognition of aromatic amino acids were determined by analyses of the CAD spectra.
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Affiliation(s)
- Akimasa Fujihara
- Department of Chemistry, Osaka Prefecture University, Osaka 599-8531, Japan.
| | - Hikaru Inoue
- Department of Chemistry, Osaka Prefecture University, Osaka 599-8531, Japan.
| | - Masanobu Sogi
- Department of Chemistry, Osaka Prefecture University, Osaka 599-8531, Japan.
| | - Michiko Tajiri
- Department of Molecular Medicine, Osaka Women's and Children's Hospital, Osaka 594-1101, Japan.
| | - Yoshinao Wada
- Department of Molecular Medicine, Osaka Women's and Children's Hospital, Osaka 594-1101, Japan.
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Klarskov K, Gagnon H, Boudreault PL, Normandin C, Plancq B, Marsault E, Gleich GJ, Naylor S. Structure determination of disease associated peak AAA from l-Tryptophan implicated in the eosinophilia-myalgia syndrome. Toxicol Lett 2017; 282:71-80. [PMID: 29037509 DOI: 10.1016/j.toxlet.2017.10.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Revised: 08/19/2017] [Accepted: 10/10/2017] [Indexed: 10/18/2022]
Abstract
The eosinophilia-myalgia syndrome (EMS) outbreak of 1989 that occurred in the USA and elsewhere was caused by the ingestion of l-Tryptophan (L-Trp) solely manufactured by the Japanese company Showa Denko K.K. (SD). Six compounds present in the SD L-Trp were reported to be case-associated contaminants. However, "one" of these compounds, Peak AAA has remained structurally uncharacterized, despite the fact that it was described as "the only statistically significant (p=0.0014) contaminant". Here, we employ on-line microcapillary-high performance liquid chromatography-electrospray ionization mass spectrometry (LC-MS), and tandem mass spectrometry (MS/MS) to determine that Peak AAA is in fact two structurally related isomers. Peak AAA1 and Peak AAA2 differed in LC retention times, and were determined by accurate mass-LC-MS to both have a protonated molecular ion (MH+) of mass 343.239Da (Da), corresponding to a molecular formula of C21H30N2O2, and possessing eight degrees of unsaturation (DoU) for the non-protonated molecule. By comparing the LC-MS and LC-MS-MS retention times and spectra with authentic synthetic standards, Peak AAA1 was identified as the intermolecular condensation product of L-Trp with anteiso 7-methylnonanoic acid, to afford (S)-2-amino-3-(2-((S,E)-7-methylnon-1-en-1-yl)-1H-indol-3-yl)propanoic acid. Peak AAA2 was determined to be a condensation product of L-Trp with decanoic acid, which produced (S)-2-amino-3-(2-((E)-dec-1-en-1-yl)-1H-indol-3-yl)propanoic acid.
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Affiliation(s)
- Klaus Klarskov
- Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec J1H 5N4, Canada
| | - Hugo Gagnon
- PhenoSwitch Bioscience, Sherbrooke, Quebec J1H 5N4, Canada
| | - Pierre-Luc Boudreault
- Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec J1H 5N4, Canada
| | - Chad Normandin
- Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec J1H 5N4, Canada
| | - Baptiste Plancq
- Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec J1H 5N4, Canada
| | - Eric Marsault
- Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec J1H 5N4, Canada
| | - Gerald J Gleich
- Departments of Dermatology and Medicine, School of Medicine, University of Utah, Salt Lake City, UT 84132, USA
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Photodegradation Pathways of Protein Disulfides: Human Growth Hormone. Pharm Res 2017; 34:2756-2778. [DOI: 10.1007/s11095-017-2256-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 09/05/2017] [Indexed: 11/25/2022]
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25
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Ruggenthaler M, Grass J, Schuh W, Huber C, Reischl R. Impurity profiling of liothyronine sodium by means of reversed phase HPLC, high resolution mass spectrometry, on-line H/D exchange and UV/Vis absorption. J Pharm Biomed Anal 2017; 143:147-158. [DOI: 10.1016/j.jpba.2017.05.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 03/28/2017] [Accepted: 05/23/2017] [Indexed: 11/28/2022]
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26
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Doan TN, Fujihara A. Enantiomer-Selective Photo-Induced Reaction of Protonated Tryptophan with Disaccharides in the Gas Phase. ORIGINS LIFE EVOL B 2017; 48:123-130. [DOI: 10.1007/s11084-017-9544-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 06/22/2017] [Indexed: 12/17/2022]
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Krishnan Y, Sharma N, Lourderaj U, Paranjothy M. Classical Dynamics Simulations of Dissociation of Protonated Tryptophan in the Gas Phase. J Phys Chem A 2017; 121:4389-4396. [PMID: 28537746 DOI: 10.1021/acs.jpca.7b01359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gas phase decomposition of protonated amino acids are of great interest due to their role in understanding protein and peptide chemistry. Several experimental and theoretical studies have been reported in the literature on this subject. In the present work, decomposition of the aromatic amino acid protonated tryptophan was studied by on-the-fly classical chemical dynamics simulations using density functional theory. Mass spectrometry and electronic structure theory studies have shown multiple dissociation pathways for this biologically relevant molecule. Unlike aliphatic amino acids, protonated tryptophan dissociates via NH3 elimination rather than the usual iminium ion formation by combined removal of H2O and CO molecules. Also, a major fragmentation pathway in the present work involves Cα-Cβ bond fission. Results of the chemical dynamics simulations reported here are in overall agreement with experiments, and detailed atomic level mechanisms are presented.
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Affiliation(s)
- Yogeshwaran Krishnan
- Department of Chemistry, Indian Institute of Technology Jodhpur , Jodhpur 342011 Rajasthan, India
| | - Nishant Sharma
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubhaneshwar, HBNI , P. O. Jatni, Khurda 752650 Orissa, India
| | - Upakarasamy Lourderaj
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubhaneshwar, HBNI , P. O. Jatni, Khurda 752650 Orissa, India
| | - Manikandan Paranjothy
- Department of Chemistry, Indian Institute of Technology Jodhpur , Jodhpur 342011 Rajasthan, India
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28
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Fujihara A, Matsuyama H, Tajiri M, Wada Y, Hayakawa S. Enantioselective Collision-Activated Dissociation of Gas-Phase Tryptophan Induced by Chiral Recognition of Protonated L-Alanine Peptides. ORIGINS LIFE EVOL B 2017; 47:161-167. [PMID: 27271107 DOI: 10.1007/s11084-016-9511-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 05/26/2016] [Indexed: 10/21/2022]
Abstract
Enantioselective dissociation in the gas phase is important for enantiomeric enrichment and chiral transmission processes in molecular clouds regarding the origin of homochirality in biomolecules. Enantioselective collision-activated dissociation (CAD) of tryptophan (Trp) and the chiral recognition ability of L-alanine peptides (L-Ala n ; n = 2-4) were examined using a linear ion trap mass spectrometer. CAD spectra of gas-phase heterochiral H+(D-Trp)(L-Ala n ) and homochiral H+(L-Trp)(L-Ala n ) noncovalent complexes were obtained as a function of the peptide size n. The H2O-elimination product was observed in CAD spectra of both heterochiral and homochiral complexes for n = 2 and 4, and in homochiral H+(L-Trp)(L-Ala3), indicating that the proton is attached to the L-alanine peptide, and H2O loss occurs from H+(L-Ala n ) in the noncovalent complexes. H2O loss did not occur in heterochiral H+(D-Trp)(L-Ala3), where NH3 loss and (H2O + CO) loss were the primary dissociation pathways. In heterochiral H+(D-Trp)(L-Ala3), the protonation site is the amino group of D-Trp, and NH3 loss and (H2O + CO) loss occur from H+(D-Trp). L-Ala peptides recognize D-Trp through protonation of the amino group for peptide size n = 3. NH3 loss and (H2O + CO) loss from H+(D-Trp) proceeds via enantioselective CAD in gas-phase heterochiral H+(D-Trp)(L-Ala3) at room temperature, whereas L-Trp dissociation was not observed in homochiral H+(L-Trp)(L-Ala3). These results suggest that enantioselective dissociation induced by chiral recognition of L-Ala peptides through protonation could play an important role in enantiomeric enrichment and chiral transmission processes of amino acids.
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Affiliation(s)
- Akimasa Fujihara
- Department of Chemistry, Osaka Prefecture University, Osaka, Japan.
| | - Hiroki Matsuyama
- Department of Chemistry, Osaka Prefecture University, Osaka, Japan
| | - Michiko Tajiri
- Department of Molecular Medicine, Osaka Medical Center and Research Institute for Matemal and Child Health, Osaka, Japan
| | - Yoshinao Wada
- Department of Molecular Medicine, Osaka Medical Center and Research Institute for Matemal and Child Health, Osaka, Japan
| | - Shigeo Hayakawa
- Department of Chemistry, Osaka Prefecture University, Osaka, Japan
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29
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Noble JA, Dedonder-Lardeux C, Mascetti J, Jouvet C. Electronic Spectroscopy of Protonated 1-Aminopyrene in a Cold Ion Trap. Chem Asian J 2017; 12:1523-1531. [DOI: 10.1002/asia.201700327] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 03/31/2017] [Indexed: 12/28/2022]
Affiliation(s)
- Jennifer Anna Noble
- Institut des Sciences Moléculaires (ISM, UMR 5255); Université de Bordeaux and CNRS; 351 Cours de la Libération F-33405 Talence France
| | - Claude Dedonder-Lardeux
- CNRS, Aix-Marseille Université, PIIM UMR 7345; Avenue Escadrille Normandie-Niémen 13397 Marseille Cedex 20 France
| | - Joëlle Mascetti
- Institut des Sciences Moléculaires (ISM, UMR 5255); Université de Bordeaux and CNRS; 351 Cours de la Libération F-33405 Talence France
| | - Christophe Jouvet
- CNRS, Aix-Marseille Université, PIIM UMR 7345; Avenue Escadrille Normandie-Niémen 13397 Marseille Cedex 20 France
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30
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Kappelmann J, Klein B, Geilenkirchen P, Noack S. Comprehensive and accurate tracking of carbon origin of LC-tandem mass spectrometry collisional fragments for 13C-MFA. Anal Bioanal Chem 2017; 409:2309-2326. [PMID: 28116490 PMCID: PMC5477699 DOI: 10.1007/s00216-016-0174-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 12/03/2016] [Accepted: 12/21/2016] [Indexed: 01/20/2023]
Abstract
In recent years the benefit of measuring positionally resolved 13C-labeling enrichment from tandem mass spectrometry (MS/MS) collisional fragments for improved precision of 13C-Metabolic Flux Analysis (13C-MFA) has become evident. However, the usage of positional labeling information for 13C-MFA faces two challenges: (1) The mass spectrometric acquisition of a large number of potentially interfering mass transitions may hamper accuracy and sensitivity. (2) The positional identity of carbon atoms of product ions needs to be known. The present contribution addresses the latter challenge by deducing the maximal positional labeling information contained in LC-ESI-MS/MS spectra of product anions of central metabolism as well as product cations of amino acids. For this purpose, we draw on accurate mass spectrometry, selectively labeled standards, and published fragmentation pathways to structurally annotate all dominant mass peaks of a large collection of metabolites, some of which with a complete fragmentation pathway. Compiling all available information, we arrive at the most detailed map of carbon atom fate of LC-ESI-MS/MS collisional fragments yet, comprising 170 intense and structurally annotated product ions with unique carbon origin from 76 precursor ions of 72 metabolites. Our 13C-data proof that heuristic fragmentation rules often fail to yield correct fragment structures and we expose common pitfalls in the structural annotation of product ions. We show that the positionally resolved 13C-label information contained in the product ions that we structurally annotated allows to infer the entire isotopomer distribution of several central metabolism intermediates, which is experimentally demonstrated for malate using quadrupole-time-of-flight MS technology. Finally, the inclusion of the label information from a subset of these fragments improves flux precision in a Corynebacterium glutamicum model of the central carbon metabolism.
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Affiliation(s)
- Jannick Kappelmann
- Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany
| | - Bianca Klein
- Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany
| | - Petra Geilenkirchen
- Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany
| | - Stephan Noack
- Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany.
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31
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Abutokaikah MT, Guan S, Bythell BJ. Stereochemical Sequence Ion Selectivity: Proline versus Pipecolic-acid-containing Protonated Peptides. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:182-189. [PMID: 27730525 DOI: 10.1007/s13361-016-1510-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 09/12/2016] [Accepted: 09/15/2016] [Indexed: 06/06/2023]
Abstract
Substitution of proline by pipecolic acid, the six-membered ring congener of proline, results in vastly different tandem mass spectra. The well-known proline effect is eliminated and amide bond cleavage C-terminal to pipecolic acid dominates instead. Why do these two ostensibly similar residues produce dramatically differing spectra? Recent evidence indicates that the proton affinities of these residues are similar, so are unlikely to explain the result [Raulfs et al., J. Am. Soc. Mass Spectrom. 25, 1705-1715 (2014)]. An additional hypothesis based on increased flexibility was also advocated. Here, we provide a computational investigation of the "pipecolic acid effect," to test this and other hypotheses to determine if theory can shed additional light on this fascinating result. Our calculations provide evidence for both the increased flexibility of pipecolic-acid-containing peptides, and structural changes in the transition structures necessary to produce the sequence ions. The most striking computational finding is inversion of the stereochemistry of the transition structures leading to "proline effect"-type amide bond fragmentation between the proline/pipecolic acid-congeners: R (proline) to S (pipecolic acid). Additionally, our calculations predict substantial stabilization of the amide bond cleavage barriers for the pipecolic acid congeners by reduction in deleterious steric interactions and provide evidence for the importance of experimental energy regime in rationalizing the spectra. Graphical Abstract ᅟ.
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Affiliation(s)
- Maha T Abutokaikah
- Department of Chemistry and Biochemistry, University of Missouri, St. Louis, MO, 63121, USA
| | - Shanshan Guan
- Department of Chemistry and Biochemistry, University of Missouri, St. Louis, MO, 63121, USA
| | - Benjamin J Bythell
- Department of Chemistry and Biochemistry, University of Missouri, St. Louis, MO, 63121, USA.
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32
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Fujihara A, Matsuo S, Tajiri M, Wada Y, Hayakawa S. Hypervalent radical formation probed by electron transfer dissociation of zwitterionic tryptophan and tryptophan-containing dipeptides complexed with Ca2+ and 18-crown-6 in the gas phase. JOURNAL OF MASS SPECTROMETRY : JMS 2015; 50:1124-1129. [PMID: 26456780 DOI: 10.1002/jms.3628] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 06/08/2015] [Accepted: 06/08/2015] [Indexed: 06/05/2023]
Abstract
The relationship between peptide structure and electron transfer dissociation (ETD) is important for structural analysis by mass spectrometry. In the present study, the formation, structure and reactivity of the reaction intermediate in the ETD process were examined using a quadrupole ion trap mass spectrometer equipped with an electrospray ionization source. ETD product ions of zwitterionic tryptophan (Trp) and Trp-containing dipeptides (Trp-Gly and Gly-Trp) were detected without reionization using non-covalent analyte complexes with Ca(2+) and 18-crown-6 (18C6). In the collision-induced dissociation, NH3 loss was the main dissociation pathway, and loss related to the dissociation of the carboxyl group was not observed. This indicated that Trp and its dipeptides on Ca(2+) (18C6) adopted a zwitterionic structure with an NH3 (+) group and bonded to Ca(2+) (18C6) through the COO(-) group. Hydrogen atom loss observed in the ETD spectra indicated that intermolecular electron transfer from a molecular anion to the NH3 (+) group formed a hypervalent ammonium radical, R-NH3 , as a reaction intermediate, which was unstable and dissociated rapidly through N-H bond cleavage. In addition, N-Cα bond cleavage forming the z1 ion was observed in the ETD spectra of Trp-GlyCa(2+) (18C6) and Gly-TrpCa(2+) (18C6). This dissociation was induced by transfer of a hydrogen atom in the cluster formed via an N-H bond cleavage of the hypervalent ammonium radical and was in competition with the hydrogen atom loss. The results showed that a hypervalent radical intermediate, forming a delocalized hydrogen atom, contributes to the backbone cleavages of peptides in ETD.
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Affiliation(s)
- Akimasa Fujihara
- Department of Chemistry, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Sou Matsuo
- Department of Chemistry, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Michiko Tajiri
- Department of Molecular Medicine, Osaka Medical Center and Research Institute for Maternal and Child Health, Sakai, Osaka, 594-1101, Japan
| | - Yoshinao Wada
- Department of Molecular Medicine, Osaka Medical Center and Research Institute for Maternal and Child Health, Sakai, Osaka, 594-1101, Japan
| | - Shigeo Hayakawa
- Department of Chemistry, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
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33
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Feketeová L, Khairallah GN, O'Hair RAJ, Nielsen SB. Gas-phase fragmentation of deprotonated tryptophan and its clusters [Trpn -H]- induced by different activation methods. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2015; 29:1395-1402. [PMID: 26147479 DOI: 10.1002/rcm.7233] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 05/19/2015] [Accepted: 05/19/2015] [Indexed: 06/04/2023]
Abstract
RATIONALE Non-covalent amino acid clusters are the subject of intense research in diverse areas including peptide bond formation studies or the determination of proton affinities or methylating abilities of amino acids. However, most of the research has focused on positive ions and little is known about anionic clusters. METHODS Fragmentation reactions of deprotonated tryptophan (Trp), [Trp-H](-) and Trp singly deprotonated non-covalently bound clusters [Trp(n) -H](-), n = 2, 3, 4, were investigated using low-energy collision-induced dissociation (CID) with He atoms, high-energy CID with Na atoms, and electron-induced dissociation (EID) with 20-35 eV electrons. Fragmentation of the monomeric Trp anion, where all labile hydrogens were exchanged for deuterium [d(4) -Trp-D](-), was investigated using low-energy CID and EID, in order to shed light on the dissociation mechanisms. RESULTS The main fragmentation channel for Trp cluster anions, [Trp(n) -H](-), n >1, is the loss of the neutral monomer. The fragmentation of the deprotonated Trp monomer induced by electrons resembles the fragmentation induced by high-energy collisions through electronic excitation of the parent. However, the excitation must precede in a different way, shown through only monomer loss from larger clusters, n >1, in case of EID, but intracluster chemistry in the case of high-energy CID. CONCLUSIONS The anion of the indole ring C(8)H(6) N(-) has been identified in the product ion spectra of [Trp(n) -H](-) using all activation methods, thus providing a diagnostic marker ion. No evidence was found for formation of peptide bonds as a route to prebiotic peptides in the fragmentation reactions of these singly deprotonated Trp cluster ions.
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Affiliation(s)
- Linda Feketeová
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Chemistry and Bio21 Institute of Molecular Science and Biotechnology, The University of Melbourne, 30 Flemington Road, Parkville, Victoria, 3010, Australia
- Université de Lyon, 69003 Lyon, France; Université Claude Bernard Lyon1; Institut de Physique Nucléaire de Lyon, CNRS/IN2P3, UMR5822, 69622 Villeurbanne, France
| | - George N Khairallah
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Chemistry and Bio21 Institute of Molecular Science and Biotechnology, The University of Melbourne, 30 Flemington Road, Parkville, Victoria, 3010, Australia
| | - Richard A J O'Hair
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Chemistry and Bio21 Institute of Molecular Science and Biotechnology, The University of Melbourne, 30 Flemington Road, Parkville, Victoria, 3010, Australia
| | - Steen Brøndsted Nielsen
- Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, 8000, Denmark
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34
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Moustafa EM, Ritacco I, Sicilia E, Russo N, Shoeib T. Collision-induced dissociation products of the protonated dipeptide carnosine: structural elucidation, fragmentation pathways and potential energy surface analysis. Phys Chem Chem Phys 2015; 17:12673-82. [PMID: 25903223 DOI: 10.1039/c5cp00958h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Collision-induced dissociation (CID) experiments on protonated carnosine, [carnosine + H](+), with several collision energies were shown to yield eleven different fragment ions with the generation of product ions [carnosine-H2O + H](+) and [carnosine-NH3 + H](+) being the lowest energy processes. Energy-resolved CID showed that at slightly higher collision energies the ions [histidine + H](+) and [histidine-H2O-CO + H](+) are formed. At even higher energies four other product ions were observed, however, attained relatively lower abundances. Quantum chemistry calculations, carried out at different levels of theory, were employed to probe fragmentation mechanisms that account for all the experimental data. All the adopted computational protocols give similar energetic trends, and the range of the calculated free energy barrier values for the generation of all the observed product ions is in agreement with the fragmentation mechanisms offered here.
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Affiliation(s)
- Eslam M Moustafa
- Department of Chemistry, The American University in Cairo, New Cairo 11835, Egypt
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35
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Naresh Chary V, Sudarshana Reddy B, Kumar CD, Srinivas R, Prabhakar S. Characterization of N,N-dimethyl amino acids by electrospray ionization-tandem mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2015; 50:771-781. [PMID: 26259661 DOI: 10.1002/jms.3588] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 02/23/2015] [Accepted: 02/23/2015] [Indexed: 06/04/2023]
Abstract
Methylation is an essential metabolic process for a number of critical reactions in the body. Methyl groups are involved in the healthy function of the body life processes, by conducting methylation process involving specific enzymes. In these processes, various amino acids are methylated, and the occurrence of methylated amino acids in nature is diverse. Nowadays, mass-spectrometric-based identification of small molecules as biomarkers for diseases is a growing research. Although all dimethyl amino acids are metabolically important molecules, mass spectral data are available only for a few of them in the literature. In this study, we report synthesis and characterization of all dimethyl amino acids, by electrospray ionization-tandem mass spectrometry (MS/MS) experiments on protonated molecules. The MS/MS spectra of all the studied dimethyl amino acids showed preliminary loss of H2O + CO to form corresponding immonium ions. The other product ions in the spectra are highly characteristic of the methyl groups on the nitrogen and side chain of the amino acids. The amino acids, which are isomeric and isobaric with the studied dimethyl amino acids, gave distinctive MS/MS spectra. The study also included MS/MS analysis of immonium ions of dimethyl amino acids that provide information on side chain structure, and it is further tested to determine the N-terminal amino acid of the peptides.
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Affiliation(s)
- V Naresh Chary
- National Centre for Mass Spectrometry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500 007, Telangana, India
| | - B Sudarshana Reddy
- National Centre for Mass Spectrometry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500 007, Telangana, India
- Academy of Scientific and Innovative Research, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500 007, Telangana, India
| | - Ch Dinesh Kumar
- National Centre for Mass Spectrometry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500 007, Telangana, India
| | - R Srinivas
- National Centre for Mass Spectrometry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500 007, Telangana, India
| | - S Prabhakar
- National Centre for Mass Spectrometry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500 007, Telangana, India
- Academy of Scientific and Innovative Research, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500 007, Telangana, India
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36
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Lorenz UJ, Rizzo TR. Structural melting of an amino acid dimer upon intersystem crossing. J Am Chem Soc 2014; 136:14974-80. [PMID: 25250642 DOI: 10.1021/ja507981p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We present a spectroscopic investigation of the excited-state dynamics of the phenylalanine (Phe)/serine (Ser) protonated dimer in the gas phase. Using an ultraviolet (UV) laser pulse, we promote individual isomers to the S1 state and probe their fate with an infrared (IR) pulse. We find that the S1 state has a lifetime of ~70 ns and undergoes intersystem crossing (ISC) to the T1 state. Time-resolved IR spectra allow us to follow the structural evolution of the dimer. In the S1 state, the different isomers retain the hydrogen-bonding pattern of the ground state. Intersystem crossing triggers a sudden increase of the vibrational energy, so that the dimers can overcome isomerization barriers and explore large parts of the potential energy surface (PES). Their broad IR spectra largely resemble one another and indicate that the dimers adopt a molten structure.
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Affiliation(s)
- Ulrich J Lorenz
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
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37
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Féraud G, Broquier M, Dedonder C, Jouvet C, Grégoire G, Soorkia S. Excited State Dynamics of Protonated Phenylalanine and Tyrosine: Photo-Induced Reactions Following Electronic Excitation. J Phys Chem A 2014; 119:5914-24. [DOI: 10.1021/jp5065837] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Géraldine Féraud
- CNRS, Laboratoire
de Physique des Interactions Ioniques et Moléculaires (PIIM)
UMR 7345, Aix Marseille Université, 13397 Marseille
cedex 20, France
| | - Michel Broquier
- CLUPS (Centre
Laser de l’Université Paris Sud) LUMAT FR 2764, Université Paris Sud, 91405 Orsay Cedex, France
- CNRS, Institut
des
Sciences Moléculaires d’Orsay (ISMO) UMR 8624, Université Paris Sud, 91405 Orsay Cedex, France
| | - Claude Dedonder
- CNRS, Laboratoire
de Physique des Interactions Ioniques et Moléculaires (PIIM)
UMR 7345, Aix Marseille Université, 13397 Marseille
cedex 20, France
| | - Christophe Jouvet
- CNRS, Laboratoire
de Physique des Interactions Ioniques et Moléculaires (PIIM)
UMR 7345, Aix Marseille Université, 13397 Marseille
cedex 20, France
| | - Gilles Grégoire
- CNRS, Sorbonne
Paris Cité, Laboratoire de Physique des Lasers, UMR 7538, Université Paris 13, 93430 Villetaneuse, France
| | - Satchin Soorkia
- CNRS, Institut
des
Sciences Moléculaires d’Orsay (ISMO) UMR 8624, Université Paris Sud, 91405 Orsay Cedex, France
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Liu F, Lu W, Fang Y, Liu J. Evolution of oxidation dynamics of histidine: non-reactivity in the gas phase, peroxides in hydrated clusters, and pH dependence in solution. Phys Chem Chem Phys 2014; 16:22179-91. [PMID: 25213401 DOI: 10.1039/c4cp03550j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Oxidation of histidine by (1)O2 is an important process associated with oxidative damage to proteins during aging, diseases and photodynamic therapy of tumors and jaundice, and photochemical transformations of biological species in the troposphere. However, the oxidation mechanisms and products of histidine differ dramatically in these related environments which range from the gas phase through aerosols to aqueous solution. Herein we report a parallel gas- and solution-phase study on the (1)O2 oxidation of histidine, aimed at evaluating the evolution of histidine oxidation pathways in different media and at different ionization states. We first investigated the oxidation of protonated and deprotonated histidine ions and the same systems hydrated with explicit water molecules in the gas phase, using guided-ion-beam-scattering mass spectrometry. Reaction coordinates and potential energy surfaces for these systems were established on the basis of density functional theory calculations, Rice-Ramsperger-Kassel-Marcus modeling and direct dynamics simulations. Subsequently we tracked the oxidation process of histidine in aqueous solution under different pH conditions, using on-line UV-Vis spectroscopy and electrospray mass spectrometry monitoring systems. The results show that two different routes contribute to the oxidation of histidine depending on its ionization states. In each mechanism hydration is essential to suppressing the otherwise predominant dissociation of reaction intermediates back to reactants. The oxidation of deprotonated histidine in the gas phase involves the formation of 2,4-endoperoxide and 2-hydroperoxide of imidazole. These intermediates evolve to hydrated imidazolone in solution, and the latter either undergoes ring-closure to 6α-hydoxy-2-oxo-octahydro-pyrrolo[2,3-d]imidazole-5-carboxylate or cross-links with another histidine to form a dimeric product. In contrast, the oxidation of protonated histidine is mediated by 2,5-endoperoxide and 5-hydroperoxide, which convert to stable hydrated imidazolone end-product in solution. The contrasting mechanisms and reaction efficiencies of protonated vs. deprotonated histidine, which lead to pH dependence in the photooxidation of histidine, are interpreted in terms of the chemistry of imidazole with (1)O2. The biological implications of the results are also discussed.
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Affiliation(s)
- Fangwei Liu
- Department of Chemistry and Biochemistry, Queens College and the Graduate Center of the City University of New York, 65-30 Kissena Blvd., Queens, New York 11367, USA.
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Fujihara A, Maeda N, Hayakawa S. Enantiomer-selective photolysis of cold gas-phase tryptophan in L-serine clusters with linearly polarized light. ORIGINS LIFE EVOL B 2014; 44:67-73. [PMID: 25351685 DOI: 10.1007/s11084-014-9370-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 10/03/2014] [Indexed: 12/24/2022]
Abstract
Photostability of cold gas-phase tryptophan (Trp) enantiomers in L-serine (L-Ser) clusters at 8 K as a model for interstellar molecular clouds was examined using a tandem mass spectrometer containing a cold ion trap to investigate the hypothesis that homochirality in gas-phase Ser clusters promotes the enantiomeric enrichment of other amino acids via enantiomer-selective photolysis with linearly polarized light. In the UV excitation of heterochiral H(+) (L-Ser) 3(D-Trp), the CO2-eliminated product in the cluster was observed. In contrast, the photodissociation mass spectrum of homochiral H(+)(L-Ser)3(L-Trp) showed that photolysis of amino acids in the cluster did not occur due to the evaporation of L-Ser molecules. In the spectra of the homochiral H(+)(L-Ser) (L-Trp) and heterochiral H(+)(L-Ser) (D-Trp), the evaporation of L-Ser was the primary reaction pathway, and no difference between the L- and D-enantiomers was observed. The findings confirm that when 3 L-Ser units are present in the cluster, the photolytic decomposition of Trp is enantiomerically selective.
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Affiliation(s)
- Akimasa Fujihara
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan,
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40
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Amorim Madeira PJ, Vaz PD, Bettencourt da Silva RJN, Florêncio MH. Can Semi-empirical Calculations Help Solve Mass Spectrometry Problems? Protonation Sites and Proton Affinities of Amino Acids. Chempluschem 2013; 78:1149-1156. [DOI: 10.1002/cplu.201300173] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 07/19/2013] [Indexed: 11/10/2022]
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Choi SS, Song MJ, Kim OB, Kim Y. Fragmentation patterns of protonated amino acids formed by atmospheric pressure chemical ionization. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2013; 27:143-151. [PMID: 23239327 DOI: 10.1002/rcm.6411] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 09/14/2012] [Accepted: 09/17/2012] [Indexed: 06/01/2023]
Abstract
RATIONALE Dissociation reactions of protonated amino acids (AAs) can be used as models for the fragmentation of protonated peptides. Atmospheric pressure chemical ionization mass spectrometry (APCI-MS) provides a great deal of structural information in a short analysis time. METHODS In APCI-MS, the fragmentation patterns can be obtained by varying the cone voltage and some fragment ions are produced that can be used to identify the structure of an analyte. In general, the fragmentation of AAs has used liquid chromatography/tandem mass spectrometry (LC/MS/MS). However, we studied the fragmentation of protonated AAs using a single quadrupole mass spectrometer. RESULTS The principal fragment ions were [M + H - H(2)O - CO](+), [M + H - H(2)O](+), and [M + H - NH(3)](+). AAs that only generated [M + H - H(2)O - CO](+) were alanine, glycine, histidine, isoleucine, leucine, proline, phenylalanine, and valine. AAs that generated [M + H - H(2)O](+) and [M + H - H(2)O - CO](+) were aspartic acid, glutamic acid, serine, and threonine, while AAs that generated [M + H - NH(3)](+) and [M + H - H(2)O - CO](+) were asparagine, cysteine, glutamine, methionine, tryptophan, and tyrosine. Arginine and lysine generated [M + H - H(2)O](+) and [M + H - NH(3)](+). CONCLUSIONS The relative abundances of the fragment ions increased with increase in the cone voltage. The experimental results were explained by the favorability of the intermediate structure and the stability of the fragment ion structure. The specific fragmentation patterns could be used for differentiating underivatized AAs.
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Affiliation(s)
- Sung-Seen Choi
- Department of Chemistry, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul, 143-747, Korea.
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Shoeib T, Zhao J, Ei Aribi H, Hopkinson AC, Siu KWM. Dissociations of complexes between monovalent metal ions and aromatic amino acid or histidine. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:38-48. [PMID: 23238948 DOI: 10.1007/s13361-012-0511-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 10/02/2012] [Accepted: 10/02/2012] [Indexed: 06/01/2023]
Abstract
The fragmentations of [AA + M](+) complexes, where AA = Phe, Tyr, Trp, or His, and M is a monovalent metal (Li, Na, or Ag), have been exhaustively studied through collision-induced dissociation (CID) and through deuterium labeling. Dissociations of the Li- and Ag-containing complexes gave a large number of fragment ions; by contrast, the sodium/amino acid complexes have lower binding energies, and dissociation resulted in much simpler spectra, with loss of the entire ligand dominating. Unambiguous assignments of these fragment ions were made and formation mechanisms are proposed. Of particular interest are fragmentations in which the charge was retained on the organic fragment and the metal was lost, either as a metal hydride (AgH) or hydroxide (LiOH) or as the silver atom (Ag(•)).
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Affiliation(s)
- Tamer Shoeib
- Department of Chemistry, The American University in Cairo, New Cairo, Egypt
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Pedersen AJ, Reitzel LA, Johansen SS, Linnet K. In vitro metabolism studies on mephedrone and analysis of forensic cases. Drug Test Anal 2012; 5:430-8. [PMID: 22573603 DOI: 10.1002/dta.1369] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 03/19/2012] [Accepted: 04/10/2012] [Indexed: 11/07/2022]
Abstract
The stimulant designer drug mephedrone is a derivative of cathinone - a monoamine alkaloid found in khat - and its effect resembles that of 3,4-Methylenedioxymethamphetamine (MDMA). Abuse of mephedrone has been documented since 2007; it was originally a 'legal high' drug, but it has now been banned in most Western countries. Using cDNA-expressed CYP enzymes and human liver microsomal preparations, we found that cytochrome P450 2D6 (CYP2D6) was the main responsible enzyme for the in vitro Phase I metabolism of mephedrone, with some minor contribution from other NAPDH-dependent enzymes. Hydroxytolyl-mephedrone and nor-mephedrone were formed in vitro, and the former was purified and identified by nuclear magnetic resonance (NMR). In four forensic traffic cases where mephedrone was detected, we identified hydroxytolyl-mephedrone and nor-mephedrone again; as well as 4-carboxy-dihydro-mephedrone, which has been previously described; and two new metabolites: dihydro-mephedrone and 4-carboxy-mephedrone. Fragmentation patterns for all detected compounds were determined by a UPLC-QTOF/MS(E) system, and a fragmentation pathway via a conjugated indole structure was proposed for most of the metabolites. Blood concentrations in the forensic traffic cases ranged from 1 to 51 µg/kg for mephedrone, and from not detected to 9 µg/kg for hydroxytolyl-mephedrone. In one case, urine concentrations were also determined to be 700 µg/kg for mephedrone and 190 µg/kg for hydroxytolyl-mephedrone. All compounds were detected or quantified with an ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) system and an ultra performance liquid chromatography-time of flight/mass spectrometry (UPLC-TOF/MS) system.
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Affiliation(s)
- Anders Just Pedersen
- Department of Forensic Medicine, Faculty of Health Sciences, University of Copenhagen, Denmark.
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Kumar SS, Lucas B, Soorkia S, Barat M, Fayeton JA. Cα–Cβ chromophore bond dissociation in protonated tyrosine-methionine, methionine-tyrosine, tryptophan-methionine, methionine-tryptophan and their sulfoxide analogs. Phys Chem Chem Phys 2012; 14:10225-32. [DOI: 10.1039/c2cp40773f] [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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Hu X, Gao X, Zhu J, Zeng Z, Zhang X, Lin Z, Xu P, Liu Y, Zhao Y. Fragmentation of pentacoordinate spirobicyclic aminoacyl-phosphoranes (P-AAs) by electrospray ionization tandem mass spectrometry concerning P-O and P-N bond cleavage. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:3151-3160. [PMID: 21953971 DOI: 10.1002/rcm.5210] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The fragmentation pathways of both protonated and sodiated pentacoordinate spirobicyclic aminoacylphosphoranes (P-AAs) have been studied by electrospray ionization multi-stage mass spectrometry (ESI-MS(n)) in positive mode. The possible pathways and their mechanisms are elucidated through the combination of ESI-MS/MS, isotope ((15)N and (2)H) labeling and high-resolution Fourier transform ion cyclotron resonance (FTICR)-MS/MS. The relative Gibbs free energies (ΔG) of the product ions and possible fragmentation pathways are estimated at the B3LYP/6-31 G(d) level of theory. The theoretical calculations show that both protonated and sodiated P-AAs would quickly fragment before Berry pseudorotation. For protonated P-AAs, they have different tendencies to P-O or P-N bond cleavage. For sodiated P-AAs, the P-N bond is easier to cleave and produces the tetracoordinated phosphorus ion H. These results to some extent may give a clue to the chemistry of the active sites of phosphoryl transfer enzymes and will enrich the gas-phase ESI-MS ion chemistry of pentacoordinate phosphoranes.
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Affiliation(s)
- Xiaomei Hu
- Department of Chemistry and The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, PR China
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Lorenz UJ, Rizzo TR. Planar Multipole Ion Trap/Time-of-Flight Mass Spectrometer. Anal Chem 2011; 83:7895-901. [DOI: 10.1021/ac201790d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Ulrich J. Lorenz
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Thomas R. Rizzo
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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Liu F, Fang Y, Chen Y, Liu J. Dissociative Excitation Energy Transfer in the Reactions of Protonated Cysteine and Tryptophan with Electronically Excited Singlet Molecular Oxygen (a1Δg). J Phys Chem B 2011; 115:9898-909. [DOI: 10.1021/jp205235d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fangwei Liu
- Department of Chemistry and Biochemistry, Queens College and the Graduate Center of the City University of New York, 65-30 Kissena Boulevard, Flushing, New York 11367, United States
| | - Yigang Fang
- Department of Chemistry and Biochemistry, Queens College and the Graduate Center of the City University of New York, 65-30 Kissena Boulevard, Flushing, New York 11367, United States
| | - Yun Chen
- Department of Chemistry and Biochemistry, Queens College and the Graduate Center of the City University of New York, 65-30 Kissena Boulevard, Flushing, New York 11367, United States
| | - Jianbo Liu
- Department of Chemistry and Biochemistry, Queens College and the Graduate Center of the City University of New York, 65-30 Kissena Boulevard, Flushing, New York 11367, United States
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Gulyuz K, Stedwell CN, Wang D, Polfer NC. Hybrid quadrupole mass filter∕quadrupole ion trap∕time-of-flight-mass spectrometer for infrared multiple photon dissociation spectroscopy of mass-selected ions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:054101. [PMID: 21639521 DOI: 10.1063/1.3585982] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present a laboratory-constructed mass spectrometer optimized for recording infrared multiple photon dissociation (IRMPD) spectra of mass-selected ions using a benchtop tunable infrared optical parametric oscillator∕amplifier (OPO∕A). The instrument is equipped with two ionization sources, an electrospray ionization source, as well as an electron ionization source for troubleshooting. This hybrid mass spectrometer is composed of a quadrupole mass filter for mass selection, a reduced pressure (∼10(-5) Torr) quadrupole ion trap (QIT) for OPO irradiation, and a reflectron time-of-flight drift tube for detecting the remaining precursor and photofragment ions. A helium gas pulse is introduced into the QIT to temporarily increase the pressure and hence enhance the trapping efficiency of axially injected ions. After a brief pump-down delay, the compact ion cloud is subjected to the focused output from the continuous wave OPO. In a recent study, we implemented this setup in the study of protonated tryptophan, TrpH(+), as well as collision-induced dissociation products of this protonated amino acid [W. K. Mino, Jr., K. Gulyuz, D. Wang, C. N. Stedwell, and N. C. Polfer, J. Phys. Chem. Lett. 2, 299 (2011)]. Here, we give a more detailed account on the figures of merit of such IRMPD experiments. The appreciable photodissociation yields in these measurements demonstrate that IRMPD spectroscopy of covalently bound ions can be routinely carried out using benchtop OPO setups.
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Affiliation(s)
- Kerim Gulyuz
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, USA
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Djurdjevic P, Cvijovic M, Zakrzewska J. Aluminium(III) complexes of S-histidine: synthesis, characterization and potentiometric and spectroscopic study of solution equilibria. J COORD CHEM 2011. [DOI: 10.1080/00958970500258807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Predrag Djurdjevic
- a Faculty of Science , Institute of Chemistry , 34000 Kragujevac, State Union of Serbia and MontenegroP.O. Box 60
| | - Mirjana Cvijovic
- b The Copper Mill , Sevojno , 31000 Uzice, State Union of Serbia and Montenegro
| | - Joanna Zakrzewska
- c Institute of General and Physical Chemistry , 11000 Belgrade, State Union of Serbia and Montenegro
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50
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Svendsen A, Lorenz UJ, Boyarkin OV, Rizzo TR. A new tandem mass spectrometer for photofragment spectroscopy of cold, gas-phase molecular ions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:073107. [PMID: 20687705 DOI: 10.1063/1.3458014] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We present here the design of a new tandem mass spectrometer that combines an electrospray ion source with a cryogenically cooled ion trap for spectroscopic studies of cold, gas-phase ions. The ability to generate large ions in the gas phase without fragmentation, cool them to approximately 10 K in an ion trap, and perform photofragment spectroscopy opens up new possibilities for spectroscopic characterization of large biomolecular ions. The incorporation of an ion funnel, together with a number of small enhancements, significantly improves the sensitivity, signal stability, and ease of use compared with the previous instrument built in our laboratory.
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Affiliation(s)
- Annette Svendsen
- Laboratoire de Chimie Physique Moléculaire, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
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