1
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Prasanthkumar KP, Valayankadan F, Aravindakumar CT, P A, Babu A, Alvarez-Idaboy JR. Identifying the Transients and Transformation Products in Hydroxyl Radical-Methimazole Reactions Using DFT and UPLC-Q-TOF MS/MS Approaches. J Phys Chem B 2024; 128:1448-1460. [PMID: 38320124 DOI: 10.1021/acs.jpcb.3c07913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
Oxidative reactions of the hydroxyl radical (·OH) with methimazole (MMI), an antithyroid drug, are crucial for understanding its fate in oxidizing environments. By synergistically integrating density functional theory and ultraperformance liquid chromatography-quadrupole time-of-flight tandem mass spectrometry (UPLC-Q-TOF MS/MS) techniques, we elucidated the transients and transformation products (TPs) arising from the ·OH-MMI reactions. We probed two hydrogen-atom abstraction (HA) reactions, three radical adduct formation reactions, and single electron transfer (SET) at the M06-2X/6-311++G(d,p)/SMD(water) level. All proposed reaction channels, except for HA from the methyl group and SET, were found to be barrier-free. SET is the dominant oxidation pathway, accounting for 44% of oxidations, as determined by branching ratio analysis. The selenium analogue, MSeI, exhibited minor reactivity differences compared to MMI, yet its overall patterns resembled those of ·OH-MMI reactions. TPs were generated experimentally by reacting MMI with ·OH produced by UV-photolysis of H2O2. Eight TPs were identified from an approximately 24% degradation of MMI using UPLC-Q-TOF MS/MS analysis, and an additional two TPs were identified from the approximately 52% degraded MMI sample. The exact identities of all of the TPs were established through their corresponding fragmentation patterns. This study elucidates the drug's susceptibility to free radical species under physiologically relevant conditions.
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Affiliation(s)
- Kavanal P Prasanthkumar
- Post Graduate and Research Department of Chemistry, Maharaja's College, Ernakulam 682 011, India
| | - Faseelath Valayankadan
- Post Graduate and Research Department of Chemistry, Maharaja's College, Ernakulam 682 011, India
| | - Charuvila T Aravindakumar
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam 686 560, India
- Inter-University Instrumentation Centre, Mahatma Gandhi University, Kottayam 686 560, India
| | - Arun P
- Inter-University Instrumentation Centre, Mahatma Gandhi University, Kottayam 686 560, India
| | - Aswathy Babu
- Post Graduate and Research Department of Chemistry, Maharaja's College, Ernakulam 682 011, India
| | - Juan R Alvarez-Idaboy
- Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, México D. F. 04510, Mexico
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2
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Ignasiak-Kciuk M, Nowicka-Bauer K, Grzechowiak M, Ravnsborg T, Frąckowiak K, Jensen ON, Jaskólski M, Marciniak B. Does the presence of ground state complex between a PR-10 protein and a sensitizer affect the mechanism of sensitized photo-oxidation? Free Radic Biol Med 2023; 198:27-43. [PMID: 36738800 DOI: 10.1016/j.freeradbiomed.2023.01.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/12/2023] [Accepted: 01/25/2023] [Indexed: 02/05/2023]
Abstract
The mechanisms of one-electron protein oxidation are complicated and still not well-understood. In this work, we investigated the reaction of sensitized photo-oxidation using carboxybenzophenone (CB) as a sensitizer and a PR-10 protein (MtN13) as a quencher, which is intrinsically complicated due to the complex structure of the protein and multiple possibilities of CB attack. To predict and examine the possible reactions precisely, the 3D structure of the MtN13 protein was taken into account. Our crystallographic studies revealed a specific binding of the CB molecule in the protein's hydrophobic cavity, while mass spectrometry identified the amino acid residues (Met, Tyr, Asp and Phe) creating adducts with the sensitizer, thus indicating the sites of 3CB* quenching. In addition, protein aggregation was also observed. The detailed mechanisms of CB quenching by the MtN13 molecule were elucidated by an analysis of transient products by means of time-resolved spectroscopy. The investigation of the transient and stable products formed during the protein photo-oxidation was based on the data obtained from HPLC-MS analysis of model compounds, single amino acids and dipeptides. Our proposed mechanisms of sensitized protein photo-oxidation emphasize the role of a ground state complex between the protein and the sensitizer and indicate several new and specific products arising as a result of one-electron oxidation. Based on the analysis of the transient and stable products, we have demonstrated the influence of neighboring groups, especially in the case of Tyr oxidation, where the tyrosyl radical can be formed via a direct electron transfer from Tyr to CB* or via an intramolecular electron transfer from Tyr to Met radical cation Met > S●+ or thiyl radical CysS● from neighboring oxidized groups.
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Affiliation(s)
- Marta Ignasiak-Kciuk
- Center for Advanced Technology, Adam Mickiewicz University, Poznan, Poland; Faculty of Chemistry, Adam Mickiewicz University, Poznan, Poland.
| | | | - Marta Grzechowiak
- Institute of Bioorganic Chemistry, Polish Academy of Science, Poznan, Poland
| | - Tina Ravnsborg
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Kamil Frąckowiak
- Faculty of Chemistry, Adam Mickiewicz University, Poznan, Poland
| | - Ole N Jensen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Mariusz Jaskólski
- Institute of Bioorganic Chemistry, Polish Academy of Science, Poznan, Poland; Faculty of Chemistry, Adam Mickiewicz University, Poznan, Poland
| | - Bronisław Marciniak
- Center for Advanced Technology, Adam Mickiewicz University, Poznan, Poland; Faculty of Chemistry, Adam Mickiewicz University, Poznan, Poland
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3
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Jiang Y, Indrajith S, Perez Mellor AF, Bürgi T, Lecouvey M, Clavaguéra C, Bodo E, Houée-Levin C, Loire E, Berden G, Oomens J, Scuderi D. Final Products of One-Electron Oxidation of Cyclic Dipeptides Containing Methionine Investigated by IRMPD Spectroscopy: Does the Free Radical Choose the Final Compound? J Phys Chem B 2022; 126:10055-10068. [PMID: 36417492 DOI: 10.1021/acs.jpcb.2c06541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Reactive oxygen species (ROS) such as hydrogen peroxide (H2O2) and the hydroxyl radical (•OH) have specific functions in biological processes, while their uncontrolled production and reactivity are known to be determining factors in pathophysiology. Methionine (Met) residues act as endogenous antioxidants, when they are oxidized into methionine sulfoxide (MetSO), thus depleting ROS and protecting the protein. We employed tandem mass spectrometry combined with IR multiple photon dissociation spectroscopy to study the oxidation induced by OH radicals produced by γ radiolysis on model cyclic dipeptides c(LMetLMet), c(LMetDMet), and c(GlyMet). Our aim was to characterize the geometries of the oxidized peptides in the gas phase and to understand the relationship between the structure of the 2-center 3-electron (2c-3e) free radical formed in the first step of the oxidation process and the final compound. Density functional theory calculations were performed to characterize the lowest energy structures of the final product of oxidation and to interpret the IR spectra. Collision-induced dissociation tandem mass spectrometry (CID-MS2) experiments of oxidized c(LMetLMet)H+ and c(LMetDMet)H+ led to the loss of one or two oxidized sulfenic acid molecules, indicating that the addition of one or two oxygen atoms occurs on the sulfur atom of both methionine side chains and no sulfone formation was observed. The CID-MS2 fragmentation mass spectrum of oxidized c(GlyMet)H+ showed only the loss of one oxidized sulfenic acid molecule. Thus, the final products of oxidation are the same regardless of the structure of the precursor sulfur-centered free radical.
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Affiliation(s)
- Yining Jiang
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR 8000, 91405 Orsay, France
| | - Suvasthika Indrajith
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR 8000, 91405 Orsay, France.,Stockholm University, Roslagstullsbacken 21 C, plan 4, Albano, Fysikum, 106 91 Stockholm, Sweden
| | - Ariel Francis Perez Mellor
- Faculté des Sciences, Section de Chimie et Biologie, Département de Chimie Physique, Université de Genève, 30 Quai Ernest-Ansermet, CH-1211 Genève, Switzerland
| | - Thomas Bürgi
- Faculté des Sciences, Section de Chimie et Biologie, Département de Chimie Physique, Université de Genève, 30 Quai Ernest-Ansermet, CH-1211 Genève, Switzerland
| | - Marc Lecouvey
- Department of Chemistry, Université Sorbonne Paris Nord, CSPBAT, CNRS, UMR 7244, 1 rue de Chablis, F-93000 Bobigny, France
| | - Carine Clavaguéra
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR 8000, 91405 Orsay, France
| | - Enrico Bodo
- Departement of Chemistry, Università di Roma La Sapienza, P. Aldo Moro 5, 00185 Rome, Italy
| | - Chantal Houée-Levin
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR 8000, 91405 Orsay, France
| | - Estelle Loire
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR 8000, 91405 Orsay, France
| | - Giel Berden
- FELIX Laboratory, Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Jos Oomens
- FELIX Laboratory, Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands.,Van't Hoff Institute for Molecular Sciences, University of Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
| | - Debora Scuderi
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR 8000, 91405 Orsay, France
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4
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Evaluation of Hydroxyl Radical Reactivity by Thioether Group Proximity in Model Peptide Backbone: Methionine versus S-Methyl-Cysteine. Int J Mol Sci 2022; 23:ijms23126550. [PMID: 35742994 PMCID: PMC9224496 DOI: 10.3390/ijms23126550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 06/08/2022] [Accepted: 06/09/2022] [Indexed: 11/17/2022] Open
Abstract
Hydroxyl radicals (HO•) have long been regarded as a major source of cellular damage. The reaction of HO• with methionine residues (Met) in peptides and proteins is a complex multistep process. Although the reaction mechanism has been intensively studied, some essential parts remain unsolved. In the present study we examined the reaction of HO• generated by ionizing radiation in aqueous solutions under anoxic conditions with two compounds representing the simplest model peptide backbone CH3C(O)NHCHXC(O)NHCH3, where X = CH2CH2SCH3 or CH2SCH3, i.e., the Met derivative in comparison with the cysteine-methylated derivative. We performed the identification and quantification of transient species by pulse radiolysis and final products by LC-MS and high-resolution MS/MS after γ-radiolysis. The results allowed us to draw for each compound a mechanistic scheme. The fate of the initial one-electron oxidation at the sulfur atom depends on its distance from the peptide backbone and involves transient species of five-membered and/or six-membered ring formations with different heteroatoms present in the backbone as well as quite different rates of deprotonation in forming α-(alkylthio)alkyl radicals.
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5
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Photo- and Radiation-Induced One-Electron Oxidation of Methionine in Various Structural Environments Studied by Time-Resolved Techniques. Molecules 2022; 27:molecules27031028. [PMID: 35164293 PMCID: PMC8915190 DOI: 10.3390/molecules27031028] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/26/2022] [Accepted: 01/27/2022] [Indexed: 11/25/2022] Open
Abstract
Oxidation of methionine (Met) is an important reaction that plays a key role in protein modifications during oxidative stress and aging. The first steps of Met oxidation involve the creation of very reactive and short-lived transients. Application of complementary time-resolved radiation and photochemical techniques (pulse radiolysis and laser flash photolysis together with time-resolved CIDNP and ESR techniques) allowed comparing in detail the one-electron oxidation mechanisms initiated either by ●OH radicals and other one-electron oxidants or the excited triplet state of the sensitizers e.g., 4-,3-carboxybenzophenones. The main purpose of this review is to present various factors that influence the character of the forming intermediates. They are divided into two parts: those inextricably related to the structures of molecules containing Met and those related to external factors. The former include (i) the protection of terminal amine and carboxyl groups, (ii) the location of Met in the peptide molecule, (iii) the character of neighboring amino acid other than Met, (iv) the character of the peptide chain (open vs cyclic), (v) the number of Met residues in peptide and protein, and (vi) the optical isomerism of Met residues. External factors include the type of the oxidant, pH, and concentration of Met-containing compounds in the reaction environment. Particular attention is given to the neighboring group participation, which is an essential parameter controlling one-electron oxidation of Met. Mechanistic aspects of oxidation processes by various one-electron oxidants in various structural and pH environments are summarized and discussed. The importance of these studies for understanding oxidation of Met in real biological systems is also addressed.
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6
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Pędzinski T, Grzyb K, Skotnicki K, Filipiak P, Bobrowski K, Chatgilialoglu C, Marciniak B. Radiation- and Photo-Induced Oxidation Pathways of Methionine in Model Peptide Backbone under Anoxic Conditions. Int J Mol Sci 2021; 22:ijms22094773. [PMID: 33946289 PMCID: PMC8125225 DOI: 10.3390/ijms22094773] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/21/2021] [Accepted: 04/27/2021] [Indexed: 01/31/2023] Open
Abstract
Within the reactive oxygen species (ROS) generated by cellular metabolisms, hydroxyl radicals (HO•) play an important role, being the most aggressive towards biomolecules. The reactions of HO• with methionine residues (Met) in peptides and proteins have been intensively studied, but some fundamental aspects remain unsolved. In the present study we examined the biomimetic model made of Ac-Met-OMe, as the simplest model peptide backbone, and of HO• generated by ionizing radiation in aqueous solutions under anoxic conditions. We performed the identification and quantification of transient species by pulse radiolysis and of final products by LC-MS and high-resolution MS/MS after γ-radiolysis. By parallel photochemical experiments, using 3-carboxybenzophenone (CB) triplet with the model peptide, we compared the outcomes in terms of short-lived intermediates and stable product identification. The result is a detailed mechanistic scheme of Met oxidation by HO•, and by CB triplets allowed for assigning transient species to the pathways of products formation.
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Affiliation(s)
- Tomasz Pędzinski
- Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznanskiego 10, 61-614 Poznan, Poland; (T.P.); (P.F.)
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland;
| | - Katarzyna Grzyb
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland;
| | - Konrad Skotnicki
- Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland;
| | - Piotr Filipiak
- Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznanskiego 10, 61-614 Poznan, Poland; (T.P.); (P.F.)
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland;
| | - Krzysztof Bobrowski
- Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland;
- Correspondence: (K.B.); (C.C.); (B.M.); Tel.: +48-22-504-1336 (K.B.); +48-61-829-1885 (B.M.)
| | - Chryssostomos Chatgilialoglu
- Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznanskiego 10, 61-614 Poznan, Poland; (T.P.); (P.F.)
- ISOF, Consiglio Nazionale delle Ricerche, Via P. Gobetti 101, 40129 Bologna, Italy
- Correspondence: (K.B.); (C.C.); (B.M.); Tel.: +48-22-504-1336 (K.B.); +48-61-829-1885 (B.M.)
| | - Bronislaw Marciniak
- Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznanskiego 10, 61-614 Poznan, Poland; (T.P.); (P.F.)
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland;
- Correspondence: (K.B.); (C.C.); (B.M.); Tel.: +48-22-504-1336 (K.B.); +48-61-829-1885 (B.M.)
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7
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Filipiak P, Bobrowski K, Hug GL, Schöneich C, Marciniak B. N-Terminal Decarboxylation as a Probe for Intramolecular Contact Formation in γ-Glu-(Pro) n-Met Peptides. J Phys Chem B 2020; 124:8082-8098. [PMID: 32813519 PMCID: PMC7503560 DOI: 10.1021/acs.jpcb.0c04371] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The kinetics of intramolecular-contact formation between remote functional groups in peptides with restricted conformational flexibility were examined using designed peptides with variable-length proline bridges. As probes for this motion, free radicals were produced using the •OH-induced oxidation at the C-terminal methionine residue of γ-Glu-(Pro)n-Met peptides (n = 0-3). The progress of the radicals' motion along the proline bridges was monitored as the radicals underwent reactions along the peptides' backbones. Of particular interest was the reaction between the sulfur atom located in the side chain of the oxidized Met residue and the unprotonated amino group of the glutamic acid moiety. Interactions between them were probed by the radiation-chemical yields (expressed as G values) of the formation of C-centered, α-aminoalkyl radicals (αN) on the Glu residue. These radicals were monitored directly or via their reaction with p-nitroacetophenone (PNAP) to generate the optically detected PNAP•- radical anions. The yields of these αN radicals were found to be linearly dependent on the number of Pro residues. A constant decrease by 0.09 μM J-1 per spacing Pro residue of the radiation-chemical yields of G(αN) was observed. Previous reports support the conclusion that the αN radicals in these cases would have to result from (S∴N)+-bonded cyclic radical cations that arose as a result from direct contact between the ends of the peptides. Furthermore, by analogy with the rate constants for the formation of intramolecularly (S∴S)+-bonded radical cations in Met-(Pro)n-Met peptides ( J. Phys. Chem. B 2016, 120, 9732), the rate constants for the formation of intramolecularly (S∴N)+-bonded radical cations are activated to the same extent for all of the γ-Glu-(Pro)n-Met peptides. Thus, the continuous decrease of G(αN) with the number of Pro residues (from 0 to 3) suggests that the formation of a contact between the S-atom in the C-terminal Met residue and the N-atom of a deprotonated N-terminal amino group of Glu is controlled in peptides with 0 to 3 Pro residues by the relative diffusion of the S•+ and unoxidized N-atom. The overall rate constants of cyclization to form the (S∴N)-bonded radical cations were estimated to be 3.8 × 106, 1.8 × 106, and 8.1 × 105 s-1 for peptides with n = 0, 1, and 2 Pro residues, respectively. If activation is the same for all of the peptides, then these rate constants are a direct indication for the end-to-end dynamics along the chain.
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Affiliation(s)
- Piotr Filipiak
- Faculty of Chemistry, Adam Mickiewicz University, 61-614 Poznan, Poland.,Center for Advanced Technology, Adam Mickiewicz University, 61-614 Poznan, Poland
| | - Krzysztof Bobrowski
- Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland.,Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Gordon L Hug
- Faculty of Chemistry, Adam Mickiewicz University, 61-614 Poznan, Poland.,Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Christian Schöneich
- School of Pharmacy, Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, Kansas 66047, United States
| | - Bronislaw Marciniak
- Faculty of Chemistry, Adam Mickiewicz University, 61-614 Poznan, Poland.,Center for Advanced Technology, Adam Mickiewicz University, 61-614 Poznan, Poland
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8
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Pedzinski T, Grzyb K, Kaźmierczak F, Frański R, Filipiak P, Marciniak B. Early Events of Photosensitized Oxidation of Sulfur-Containing Amino Acids Studied by Laser Flash Photolysis and Mass Spectrometry. J Phys Chem B 2020; 124:7564-7573. [PMID: 32790392 PMCID: PMC7498160 DOI: 10.1021/acs.jpcb.0c06008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
![]()
The
mechanism of photooxidation of methionine (N-Ac-Met-NH-CH3, 1) and methyl-cysteine (N-Ac-MeCys-NH-CH3, 2) analogues by 3-carboxybenzophenone triplet
(3CB*) in neutral aqueous solution was studied using techniques of
nanosecond laser flash photolysis and steady-state photolysis. The
short-lived transients derived from 3CB and sulfur-containing amino
acids were identified, and their quantum yields and kinetics of formation
and decay were determined. The stable photoproducts were analyzed
using liquid chromatography coupled with high-resolution mass spectrometry.
Substantial differences in the mechanisms were found for methionine
and S-methyl-cysteine analogues for both primary
and secondary photoreactions. A new secondary reaction channel (back
hydrogen atom transfer from the ketyl radical to the carbon-centered
α-thioalkyl radical yielding reactants in the ground states)
was suggested. The detailed mechanisms of 3CB* sensitized photooxidation
of 1 and 2 are proposed and discussed.
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Affiliation(s)
- Tomasz Pedzinski
- Center for Advanced Technology, Adam Mickiewicz University, 10 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland.,Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland
| | - Katarzyna Grzyb
- Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland
| | - Franciszek Kaźmierczak
- Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland
| | - Rafał Frański
- Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland
| | - Piotr Filipiak
- Center for Advanced Technology, Adam Mickiewicz University, 10 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland.,Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland
| | - Bronislaw Marciniak
- Center for Advanced Technology, Adam Mickiewicz University, 10 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland.,Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznanskiego Str., 61-614 Poznan, Poland
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9
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Unexpected Reaction Pathway of the Alpha-Aminoalkyl Radical Derived from One-Electron Oxidation of S-Alkylglutathiones. Molecules 2020; 25:molecules25040877. [PMID: 32079230 PMCID: PMC7070667 DOI: 10.3390/molecules25040877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 02/11/2020] [Accepted: 02/12/2020] [Indexed: 11/17/2022] Open
Abstract
Laser flash photolysis and high-resolution mass spectrometry were used to investigate the mechanism of one-electron oxidation of two S-alkylglutathiones using 3-carboxybenzophenone (3CB) as a photosensitizer. This report indicates an unexpected reaction pathway of the α-aminoalkyl radical cation (αN+) derived from the oxidation of S-alkylglutathiones. Instead of a common hydrolysis reaction of αN+ reported earlier for methionine and other sulfur-containing aminoacids and peptides, an intramolecular ring-closure reaction was found for S-alkylglutathiones.
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10
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Radical rearrangement and transfer reactions in proteins. Essays Biochem 2020; 64:87-96. [PMID: 31922197 DOI: 10.1042/ebc20190046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 12/16/2019] [Accepted: 12/19/2019] [Indexed: 12/29/2022]
Abstract
Radical rearrangement and transfer reactions play an important role in the chemical modifications of proteins in vivo and in vitro. These reactions depend on protein sequence, as well as structure and dynamics. Frequently, these reactions have well-defined precedents in the organic chemistry literature, but their occurrence in proteins provides a stage for a number of novel and, perhaps, unexpected reaction products. This essay will provide an overview over a few representative examples of radical rearrangement and transfer reactions.
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11
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Skotnicki K, Taras-Goslinska K, Janik I, Bobrowski K. Radiation Induced One-Electron Oxidation of 2-Thiouracil in Aqueous Solutions. Molecules 2019; 24:E4402. [PMID: 31810289 PMCID: PMC6930642 DOI: 10.3390/molecules24234402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Revised: 11/27/2019] [Accepted: 11/27/2019] [Indexed: 11/17/2022] Open
Abstract
Oxidative damage to 2-thiouracil (2-TU) by hydroxyl (•OH) and azide (●N3) radicals produces various primary reactive intermediates. Their optical absorption spectra and kinetic characteristics were studied by pulse radiolysis with UV-vis spectrophotometric and conductivity detection and by time-dependent density functional theory (TD-DFT) method. The transient absorption spectra recorded in the reactions of •OH with 2-TU depend on the concentration of 2-TU, however, only slightly on pH. At low concentrations, they are characterized by a broad absorption band with a weakly pronounced maxima located at λ = 325, 340 and 385 nm, whereas for high concentrations, they are dominated by an absorption band with λmax ≈ 425 nm. Based on calculations using TD-DFT method, the transient absorption spectra at low concentration of 2-TU were assigned to the ●OH-adducts to the double bond at C5 and C6 carbon atoms (3●, 4●) and 2c-3e bonded ●OH adduct to sulfur atom (1…●OH) and at high concentration of 2-TU also to the dimeric 2c-3e S-S-bonded radical in neutral form (2●). The dimeric radical (2●) is formed in the reaction of thiyl-type radical (6●) with 2-TU and both radicals are in an equilibrium with Keq = 4.2 × 103 M-1. Similar equilibrium (with Keq = 4.3 × 103 M-1) was found for pH above the pKa of 2-TU which involves admittedly the same radical (6●) but with the dimeric 2c-3e S-S bonded radical in anionic form (2●-). In turn, ●N3-induced oxidation of 2-TU occurs via radical cation with maximum spin location on the sulfur atom which subsequently undergoes deprotonation at N1 atom leading again to thiyl-type radical (6●). This radical is a direct precursor of dimeric radical (2●).
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Affiliation(s)
- Konrad Skotnicki
- Centre of Radiation Research and Technology, Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland;
| | | | - Ireneusz Janik
- Notre Dame Radiation Laboratory, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Krzysztof Bobrowski
- Centre of Radiation Research and Technology, Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland;
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12
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•OH oxidation of methionine in the presence of discrete water molecules: DFT, QTAIM and valence bond analyses. Struct Chem 2019. [DOI: 10.1007/s11224-019-01438-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Archirel P, Houée-Lévin C, Marignier JL. Radiolytic Oxidation of Two Inverse Dipeptides, Methionine-Valine and Valine-Methionine: A Joint Experimental and Computational Study. J Phys Chem B 2019; 123:9087-9097. [PMID: 31577444 DOI: 10.1021/acs.jpcb.9b07014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The two inverse peptides methionine-valine (Met-Val) and valine-methionine (Val-Met) are investigated in an oxidative radiolysis process in water. The OH radical yields products with very different absorption spectra and concentration effects: Met-Val yields one main product with a band at about 400 nm and other products at higher energies; there is no concentration effect. Val-Met yields at least three products, with a striking concentration effect. Molecular simulations are performed with a combination of the Monte Carlo, density functional theory, and reaction field methods. The simulation of the possible transients enables an interpretation of the radiolysis: (1) Met-Val undergoes an H atom uptake leaving mainly a neutral radical with a 2-center-3-electron (2c-3e) SN bond, which cannot dimerize. Other radicals are present at higher energies. (2) Val-Met undergoes mainly an electron uptake leaving a cation monomer with a (2c-3e) SO bond and a cation dimer with a (2c-3e) SS bond. At higher energies, neutral radicals are possible. This cation monomer can transfer a proton toward a neutral peptide, leaving a neutral radical.
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Affiliation(s)
- Pierre Archirel
- Laboratoire de Chimie Physique , CNRS UMR 8000, Université Paris-Sud, Université Paris-Saclay , F91405 Orsay , France
| | - Chantal Houée-Lévin
- Laboratoire de Chimie Physique , CNRS UMR 8000, Université Paris-Sud, Université Paris-Saclay , F91405 Orsay , France
| | - Jean-Louis Marignier
- Laboratoire de Chimie Physique , CNRS UMR 8000, Université Paris-Sud, Université Paris-Saclay , F91405 Orsay , France
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14
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Synthesis and biological evaluation of quercetin and resveratrol peptidyl derivatives as potential anticancer and antioxidant agents. Amino Acids 2018; 51:319-329. [PMID: 30392096 DOI: 10.1007/s00726-018-2668-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 10/16/2018] [Indexed: 12/26/2022]
Abstract
Quercetin and resveratrol are polyphenolic compounds, members of the flavonoid and the stilbene family, respectively, both medicinally important as dietary anticancer and antioxidant agents. They are present in a variety of foods-including fruits, vegetables, tea, wine, as well as other dietary supplements-and are responsible for various health benefits. Different quercetin and resveratrol esters of Leu/Met-enkephalin and tetrapeptide Leu-Ser-Lys-Leu (LSKL) were synthesized as model systems for monitoring the influence of the peptides on biological activity of resveratrol and quercetin. General formula of the main peptidyl-quercetin derivatives is 2-[3-(aa)n-4-hydroxyphenyl]-3,5,7-tri-hydroxy-4H-1-benzopyran-4-on, and the general formula of the main peptidyl-resveratrol derivatives is (E)-5-[4-(aa)n)styryl]benzene-1,3-diol. The antioxidant and anticancer activities of prepared compounds were investigated. Significant anticancer activity was obtained for the LSKL-based both quercetin and resveratrol derivatives. All prepared compounds exhibit antioxidant activity, in particular quercetin derivative containing Met-enkephalin.
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Effect of Chemical Oxidation on the Higher Order Structure, Stability, Aggregation, and Biological Function of Interferon Alpha-2a: Role of Local Structural Changes Detected by 2D NMR. Pharm Res 2018; 35:232. [PMID: 30324266 DOI: 10.1007/s11095-018-2518-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 10/03/2018] [Indexed: 12/12/2022]
Abstract
PURPOSE Oxidized interferons have been shown to aggregate and cause immunogenicity. In this study, the structural mechanisms underlying oxidation-induced interferon alpha-2a (IFNA2a) aggregation and loss of function were examined. METHODS IFNA2a was oxidized using 0.037% vol/vol hydrogen peroxide. Oxidized protein was probed using biophysical methods that include denaturant melts, particle counting, proteolysis-coupled mass spectrometry, and 2D NMR. RESULTS Oxidized IFNA2a did not show major changes in its secondary structure, but showed minor changes in tertiary structure when compared to the unoxidized protein. In addition, a significant loss of conformational stability was observed upon oxidation. Correspondingly, increased protein aggregation was observed resulting in the formation of sub-visible particles. Oxidized protein showed decreased biological function in terms of its anti-viral potency and cytopathic inhibition efficacy. Proteolysis-coupled mass spectrometry identified five methionine residues that were oxidized with no correlation between the extent of oxidation and their accessible surface area. 2D 15N-1H HSQC NMR identified residue-level local structural changes in the protein upon oxidation, which were not detectable by global probes such as far-UV circular dichroism and fluorescence. CONCLUSIONS Increased protein aggregation and decreased function of IFNA2a upon oxidation correlated with the site of modification identified by proteolysis-coupled mass spectrometry and local structural changes in the protein detected by 2D NMR.
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16
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Xie M, Shen Z, Wang D, Fujii A, Lee YP. Spectral Characterization of Three-Electron Two-Center (3e-2c) Bonds of Gaseous CH 3S∴S(H)CH 3 and (CH 3SH) 2+ and Enhancement of the 3e-2c Bond upon Protonation. J Phys Chem Lett 2018; 9:3725-3730. [PMID: 29920092 DOI: 10.1021/acs.jpclett.8b01491] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The three-electron two-center (3e-2c) bond plays an important role in structures and electron communication in biological systems involving cationic sulfur compounds. Although the nature of 3e-2c bonds and their theoretical formalism have attracted great interest, direct spectral identifications of 3e-2c-bound molecules are scarce. We observed the infrared spectra of the weakly 3e-2c-bound CH3S∴S(H)CH3 and the strongly 3e-2c-bound (CH3SH)2+ in a supersonic jet using infrared (IR) dissociation with vacuum-ultraviolet photoionization and time-of-flight detection. Protonation of CH3S∴S(H)CH3 to form [CH3(H)S∴S(H)CH3]+ significantly enhances the 3e-2c bond, characterized by a large red shift of the SH-stretching band with enhanced IR intensity, shortening of the calculated S-S distance from 3.00 to 2.86 Å, and a dissociation energy increased from ∼23 to 162 kJ mol-1.
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Affiliation(s)
- Min Xie
- Department of Applied Chemistry and Institute of Molecular Science , National Chiao Tung University , 1001 Ta-Hsueh Road , Hsinchu 30010 , Taiwan
| | - Zhitao Shen
- Department of Applied Chemistry and Institute of Molecular Science , National Chiao Tung University , 1001 Ta-Hsueh Road , Hsinchu 30010 , Taiwan
| | - Dandan Wang
- Department of Chemistry , Graduate School of Science, Tohoku University , Sendai 980-8578 , Japan
| | - Asuka Fujii
- Department of Chemistry , Graduate School of Science, Tohoku University , Sendai 980-8578 , Japan
| | - Yuan-Pern Lee
- Department of Applied Chemistry and Institute of Molecular Science , National Chiao Tung University , 1001 Ta-Hsueh Road , Hsinchu 30010 , Taiwan
- Center for Emergent Functional Matter Science , National Chiao Tung University , Hsinchu 30010 , Taiwan
- Institute of Atomic and Molecular Sciences , Academia Sinica , Taipei 10617 , Taiwan
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17
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Uranga J, Mujika JI, Grande-Aztatzi R, Matxain JM. Oxidation of Acid, Base, and Amide Side-Chain Amino Acid Derivatives via Hydroxyl Radical. J Phys Chem B 2018; 122:4956-4971. [PMID: 29676577 DOI: 10.1021/acs.jpcb.7b12450] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Hydroxyl radical (•OH) is known to be highly reactive. Herein, we analyze the oxidation of acid (Asp and Glu), base (Arg and Lys), and amide (Asn and Gln) containing amino acid derivatives by the consecutive attack of two •OH. In this work, we study the reaction pathway by means of density functional theory. The oxidation mechanism is divided into two steps: (1) the first •OH can abstract a H atom or an electron, leading to a radical amino acid derivative, which is the intermediate of the reaction and (2) the second •OH can abstract another H atom or add itself to the formed radical, rendering the final oxidized products. The studied second attack of •OH is applicable to situations where high concentration of •OH is found, e.g., in vitro. Carbonyls are the best known oxidation products for these reactions. This work includes solvent dielectric and confirmation's effects of the reaction, showing that both are negligible. Overall, the most favored intermediates of the oxidation process at the side chain correspond to the secondary radicals stabilized by hyperconjugation. Intermediates show to be more stable in those cases where the spin density of the unpaired electron is lowered. Alcohols formed at the side chains are the most favored products, followed by the double-bond-containing ones. Interestingly, Arg and Lys side-chain scission leads to the most favored carbonyl-containing oxidation products, in line with experimental results.
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Affiliation(s)
- Jon Uranga
- Kimika Fakultatea-Chemistry Department , Euskal Herriko Unibertsitatea (UPV/EHU) , P.K. 1072 , 20080 Donostia , Euskadi , Spain.,Donostia International Physics Center (DIPC) , Manuel Lardizabal 4 , 20018 Donostia , Euskadi , Spain
| | - Jon I Mujika
- Donostia International Physics Center (DIPC) , Manuel Lardizabal 4 , 20018 Donostia , Euskadi , Spain
| | - Rafael Grande-Aztatzi
- Donostia International Physics Center (DIPC) , Manuel Lardizabal 4 , 20018 Donostia , Euskadi , Spain
| | - Jon M Matxain
- Kimika Fakultatea-Chemistry Department , Euskal Herriko Unibertsitatea (UPV/EHU) , P.K. 1072 , 20080 Donostia , Euskadi , Spain.,Donostia International Physics Center (DIPC) , Manuel Lardizabal 4 , 20018 Donostia , Euskadi , Spain
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18
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19
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Schöneich C. Sulfur Radical-Induced Redox Modifications in Proteins: Analysis and Mechanistic Aspects. Antioxid Redox Signal 2017; 26:388-405. [PMID: 27288212 DOI: 10.1089/ars.2016.6779] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
SIGNIFICANCE The sulfur-containing amino acids cysteine (Cys) and methionine (Met) are prominent protein targets of redox modification during conditions of oxidative stress. Here, two-electron pathways have received widespread attention, in part due to their role in signaling processes. However, Cys and Met are equally prone to one-electron pathways, generating intermediary radicals and/or radial ions. These radicals/radical ions can generate various reaction products that are not commonly monitored in redox proteomic studies, but they may be relevant for the fate of proteins during oxidative stress. Recent Advances: Time-resolved kinetic studies and product analysis have expanded our mechanistic understanding of radical reaction pathways of sulfur-containing amino acids. These reactions are now studied in some detail for Met and Cys in proteins, and homocysteine (Hcy) chemically linked to proteins, and the role of protein radical reactions in physiological processes is evolving. CRITICAL ISSUES Radical-derived products from Cys, Hcy, and Met can react with additional amino acids in proteins, leading to secondary protein modifications, which are potentially remote from initial points of radical attack. These products may contain intra- and intermolecular cross-links, which may lead to protein aggregation. Protein sequence and conformation will have a significant impact on the formation of such products, and a thorough understanding of reaction mechanisms and specifically how protein structure influences reaction pathways will be critical for identification and characterization of novel reaction products. FUTURE DIRECTIONS Future studies must evaluate the biological significance of novel reaction products that are derived from radical reactions of sulfur-containing amino acids. Antioxid. Redox Signal. 26, 388-405.
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Affiliation(s)
- Christian Schöneich
- Department of Pharmaceutical Chemistry, The University of Kansas , Lawrence, Kansas
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20
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21
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Szabó L, Mile V, Tóth T, Balogh GT, Földes T, Takács E, Wojnárovits L. On the complex •OH/•O−-induced free radical chemistry of arylalkylamines with special emphasis on the contribution of the alkylamine side chain. Free Radic Res 2017; 51:124-140. [DOI: 10.1080/10715762.2017.1287356] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- László Szabó
- Centre for Energy Research, Hungarian Academy of Sciences, Institute for Energy Security and Environmental Safety, Budapest, Hungary
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Viktória Mile
- Centre for Energy Research, Hungarian Academy of Sciences, Institute for Energy Security and Environmental Safety, Budapest, Hungary
| | - Tünde Tóth
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - György T. Balogh
- Compound Profiling Laboratory, Gedeon Richter Plc, Budapest, Hungary
| | - Tamás Földes
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Institute of Organic Chemistry, Budapest, Hungary
| | - Erzsébet Takács
- Centre for Energy Research, Hungarian Academy of Sciences, Institute for Energy Security and Environmental Safety, Budapest, Hungary
| | - László Wojnárovits
- Centre for Energy Research, Hungarian Academy of Sciences, Institute for Energy Security and Environmental Safety, Budapest, Hungary
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22
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Barata-Vallejo S, Ferreri C, Zhang T, Permentier H, Bischoff R, Bobrowski K, Chatgilialoglu C. Radiation chemical studies of Gly-Met-Gly in aqueous solution. Free Radic Res 2016; 50:S24-S39. [PMID: 27592721 DOI: 10.1080/10715762.2016.1231402] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Important biological consequences are related to the reaction of HO• radicals with methionine (Met). Several fundamental aspects remain to be defined when Met is an amino acid residue incorporated in the interior of peptides and proteins. The present study focuses on Gly-Met-Gly, the simplest peptide where Met is not a terminal residue. The reactions of HO• with Gly-Met-Gly and its N-acetyl derivative were studied by pulse radiolysis technique. The transient absorption spectra were resolved into contributions from specific components of radical intermediates. Moreover, a detailed product analysis is provided for the first time for Met-containing peptides in radiolytic studies to support the mechanistic proposal. By parallel radiolytical and electrochemical reactions and consequent product identification, the formation of sulfoxide attributed to the direct HO• radical attack on the sulfide functionality of the Met residue could be excluded, with the in situ generated hydrogen peroxide responsible for this oxidation. LC-MS and high resolution MS/MS were powerful analytical tools to envisage the structures of five products, thus allowing to complete the mechanistic picture of the overall Met-containing peptide reactivity.
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Affiliation(s)
| | - Carla Ferreri
- a ISOF , Consiglio Nazionale delle Ricerche , Bologna , Italy
| | - Tao Zhang
- b Department of Pharmacy , University of Groningen , Groningen , The Netherlands
| | - Hjalmar Permentier
- b Department of Pharmacy , University of Groningen , Groningen , The Netherlands
| | - Rainer Bischoff
- b Department of Pharmacy , University of Groningen , Groningen , The Netherlands
| | | | - Chryssostomos Chatgilialoglu
- a ISOF , Consiglio Nazionale delle Ricerche , Bologna , Italy.,d Institute of Nanoscience and Nanotechnology , NCSR Demokritos , Athens , Greece
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23
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Archirel P, Bergès J, Houée-Lévin C. Radical Cations of the Monomer and van der Waals Dimer of a Methionine Residue as Prototypes of (2 Center–3 Electron) SN and SS Bonds. Molecular Simulations of Their Absorption Spectra in Water. J Phys Chem B 2016; 120:9875-86. [DOI: 10.1021/acs.jpcb.6b06329] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Pierre Archirel
- Laboratoire
de Chimie Physique, CNRS, UMR 8000, Université Paris-Sud, F91405 Orsay, France
| | - Jacqueline Bergès
- Laboratoire
de Chimie Théorique, UPMC Univ Paris 06, CNRS, UMR 7616, Sorbonne Universités, CC 137-4, place Jussieu, F75252 Paris Cedex 05, France
| | - Chantal Houée-Lévin
- Laboratoire
de Chimie Physique, CNRS, UMR 8000, Université Paris-Sud, F91405 Orsay, France
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24
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Filipiak P, Bobrowski K, Hug GL, Pogocki D, Schöneich C, Marciniak B. Formation of a Three-Electron Sulfur–Sulfur Bond as a Probe for Interaction between Side Chains of Methionine Residues. J Phys Chem B 2016; 120:9732-44. [DOI: 10.1021/acs.jpcb.6b06494] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Piotr Filipiak
- Faculty
of Chemistry, Adam Mickiewicz University, 61-614 Poznan, Poland
| | - Krzysztof Bobrowski
- Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland
- Radiation
Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Gordon L. Hug
- Faculty
of Chemistry, Adam Mickiewicz University, 61-614 Poznan, Poland
- Radiation
Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Dariusz Pogocki
- Faculty
of Biology and Agriculture, University of Rzeszow, 35-601 Rzeszow, Poland
| | - Christian Schöneich
- School
of Pharmacy, Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, Kansas 66047, United States
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25
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Köchling T, Morozova OB, Yurkovskaya AV, Vieth HM. Magnetic Resonance Characterization of One-Electron Oxidized Cyclic Dipeptides with Thioether Groups. J Phys Chem B 2016; 120:9277-86. [DOI: 10.1021/acs.jpcb.6b05442] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Talea Köchling
- Institut
für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Olga B. Morozova
- International Tomography Center, Institutskaya
3a, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
2, 630090 Novosibirsk, Russia
| | - Alexandra V. Yurkovskaya
- International Tomography Center, Institutskaya
3a, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
2, 630090 Novosibirsk, Russia
| | - Hans-Martin Vieth
- Institut
für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
- International Tomography Center, Institutskaya
3a, 630090 Novosibirsk, Russia
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26
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Yamamoto T, Dai J, Jacobsen NE, Ammam M, Hall GB, Mozziconacci O, Schöneich C, Wilson GS, Glass RS. Neighboring π-Amide Participation in Thioether Oxidation: Conformational Control. Org Lett 2016; 18:3522-5. [DOI: 10.1021/acs.orglett.6b01309] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takuhei Yamamoto
- Department
of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
| | - Jixun Dai
- Department
of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
| | - Neil E. Jacobsen
- Department
of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
| | - Malika Ammam
- Department
of Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States
| | - Gabriel B. Hall
- Department
of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
| | - Olivier Mozziconacci
- Department
of Pharmaceutical Chemistry, The University of Kansas, Lawrence, Kansas 66047, United States
| | - Christian Schöneich
- Department
of Pharmaceutical Chemistry, The University of Kansas, Lawrence, Kansas 66047, United States
| | - George S. Wilson
- Department
of Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States
| | - Richard S. Glass
- Department
of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
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27
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Uranga J, Lakuntza O, Ramos-Cordoba E, Matxain JM, Mujika JI. A computational study of radical initiated protein backbone homolytic dissociation on all natural amino acids. Phys Chem Chem Phys 2016; 18:30972-30981. [DOI: 10.1039/c6cp06529e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydroxyl radical (˙OH) is known to be one of the most reactive species. The attack of this radical onto the backbone of all natural amino acids is investigated.
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Affiliation(s)
- Jon Uranga
- Kimika Fakultatea
- Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC)
- 20080 Donostia
- Spain
| | - Oier Lakuntza
- Institut Catala d'Investigacio Quimica (ICIQ)
- 43007 Tarragona
- Spain
| | - Eloy Ramos-Cordoba
- Kimika Fakultatea
- Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC)
- 20080 Donostia
- Spain
- Department of Chemistry
| | - Jon M. Matxain
- Kimika Fakultatea
- Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC)
- 20080 Donostia
- Spain
| | - Jon I. Mujika
- Kimika Fakultatea
- Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC)
- 20080 Donostia
- Spain
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28
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Uranga J, Mujika JI, Matxain JM. ·OH Oxidation Toward S- and OH-Containing Amino Acids. J Phys Chem B 2015; 119:15430-42. [DOI: 10.1021/acs.jpcb.5b09825] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jon Uranga
- Kimika Fakultatea,
Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International
Physics Center (DIPC), P.K. 1072, 20080 Donostia, Euskadi, Spain
| | - Jon I. Mujika
- Kimika Fakultatea,
Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International
Physics Center (DIPC), P.K. 1072, 20080 Donostia, Euskadi, Spain
| | - Jon M. Matxain
- Kimika Fakultatea,
Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International
Physics Center (DIPC), P.K. 1072, 20080 Donostia, Euskadi, Spain
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29
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Thiruppathi D, Karuppasamy P, Ganesan M, Sivasubramanian VK, Rajendran T, Rajagopal S. Electron transfer reactions of methionine peptides with photochemically generated ruthenium(III)–polypyridyl complexes. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.09.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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30
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Electron Transfer Reactions of Photochemically Generated Ruthenium(III)-Polypyridyl Complexes with Methionines. INT J CHEM KINET 2014. [DOI: 10.1002/kin.20874] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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Ignasiak MT, Pedzinski T, Rusconi F, Filipiak P, Bobrowski K, Houée-Levin C, Marciniak B. Photosensitized oxidation of methionine-containing dipeptides. From the transients to the final products. J Phys Chem B 2014; 118:8549-58. [PMID: 24946261 DOI: 10.1021/jp5039305] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Met residue oxidation has been studied for decades. Although many efforts have been made on the identification of free radicals, some doubts remain about their final fates, i.e., the nature of stable oxidation products. The photosensitized oxidation processes of two peptides, methionyl lysine (Met-Lys) and lysyl methionine (Lys-Met), were investigated using 3-carboxybenzophenone (3CB) as a sensitizer. Therefore, not only the transients were characterized but also the final products (by high-performance liquid chromatography and mass spectrometry) together with the quantum yields. As for the transients, the sulfur radical cations stabilized by a two-center three electron bonds with a nitrogen (S.·.N)(+) were identified in the case of Met-Lys. On the other hand, in Lys-Met, the intermolecular (S.·.S)(+) radical cations were found. The peptide-3CB adduct was the only stable product detected and was accompanied neither by sulfoxide formation nor by decarboxylation. It shows that both (S.·.N)(+) and (S.·.S)(+) radicals are converted into the relatively long-lived α-(alkylthio)alkyl radicals, which add to the 3CB-derived radicals. This addition reaction prevented all other oxidation processes such as formation of sulfoxide. The lysine residue was totally protected, which may also be of importance in biological processes.
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Affiliation(s)
- Marta T Ignasiak
- Faculty of Chemistry, Adam Mickiewicz University , Umultowska 89b, 61614 Poznan, Poland
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32
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Pogocki D, Bobrowski K. Oxidative Degradation of Thiaproline Derivatives in Aqueous Solutions Induced by•OH Radicals. Isr J Chem 2014. [DOI: 10.1002/ijch.201300110] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Ignasiak MT, Marciniak B, Houée-Levin C. A Long Story of Sensitized One-Electron Photo-oxidation of Methionine. Isr J Chem 2014. [DOI: 10.1002/ijch.201300109] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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Hendon CH, Carbery DR, Walsh A. Three-electron two-centred bonds and the stabilisation of cationic sulfur radicals. Chem Sci 2014. [DOI: 10.1039/c3sc53432d] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Spin stabilisation of conjugated motifs and heteroatoms suggests that the primary mechanism for cationic thioether stabilisation is not three-electron two-centred bonds.
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Affiliation(s)
| | | | - Aron Walsh
- Department of Chemistry
- University of Bath
- Bath, UK
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35
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Gene expression and physiological role of Pseudomonas aeruginosa methionine sulfoxide reductases during oxidative stress. J Bacteriol 2013; 195:3299-308. [PMID: 23687271 DOI: 10.1128/jb.00167-13] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Pseudomonas aeruginosa PAO1 has two differentially expressed methionine sulfoxide reductase genes: msrA (PA5018) and msrB (PA2827). The msrA gene is expressed constitutively at a high level throughout all growth phases, whereas msrB expression is highly induced by oxidative stress, such as sodium hypochlorite (NaOCl) treatment. Inactivation of either msrA or msrB or both genes (msrA msrB mutant) rendered the mutants less resistant than the parental PAO1 strain to oxidants such as NaOCl and H2O2. Unexpectedly, msr mutants have disparate resistance patterns when exposed to paraquat, a superoxide generator. The msrA mutant had a higher paraquat resistance level than the msrB mutant, which had a lower paraquat resistance level than the PAO1 strain. The expression levels of msrA showed an inverse correlation with the paraquat resistance level, and this atypical paraquat resistance pattern was not observed with msrB. Virulence testing using a Drosophila melanogaster model revealed that the msrA, msrB, and, to a greater extent, msrA msrB double mutants had an attenuated virulence phenotype. The data indicate that msrA and msrB are essential genes for oxidative stress protection and bacterial virulence. The pattern of expression and mutant phenotypes of P. aeruginosa msrA and msrB differ from previously characterized msr genes from other bacteria. Thus, as highly conserved genes, the msrA and msrB have diverse expression patterns and physiological roles that depend on the environmental niche where the bacteria thrive.
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36
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Zhao J, Yang H, Zhang M, Bu Y. Interactions of amino acids with oxidized guanine in the gas phase associated with the protection of damaged DNA. Chemphyschem 2013; 14:1031-42. [PMID: 23427004 DOI: 10.1002/cphc.201200979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 01/16/2013] [Indexed: 11/11/2022]
Abstract
Density functional theory calculations were employed to study the stabilization process of the guanine radical cation through amino acid interactions as well as to understand the protection mechanisms. On the basis of our calculations, several protection mechanisms are proposed in this work subject to the type of the amino acid. Our results indicate that a series of three-electron bonds can be formed between the amino acids and the guanine radical cation which may serve as relay stations supporting hole transport. In the three-electron-bonded, π-π-stacked, and H-bonded modes, amino acids can protect guanine from oxidation or radiation damage by sharing the hole, while amino acids with reducing properties can repair the guanine radical cation through proton-coupled electron transfer or electron transfer. Another important finding is that positively charged amino acids (ArgH(+), LysH(+), and HisH(+)) can inhibit ionization of guanine through raising its ionization potential. In this situation, a negative dissociation energy for hydrogen bonds in the hole-trapped and positively charged amino acid-Guanine dimer is observed, which explains the low hole-trapping efficiency. We hope that this work provides valuable information on how to protect DNA from oxidation- or radiation-induced damages in biological systems.
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Affiliation(s)
- Jing Zhao
- The Center for Modeling & Simulation Chemistry, Institute of Theoretical Chemistry, Shandong University, Jinan, 250100, P. R. China
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37
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Xipsiti C, Nicolaides AV. A computational study on the possible role of oxygen in the oxidation of methionine and dimethylsulfide initiated by OH radicals. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2012.12.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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38
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Houée-Levin C, Bobrowski K. The use of the methods of radiolysis to explore the mechanisms of free radical modifications in proteins. J Proteomics 2013; 92:51-62. [PMID: 23454334 DOI: 10.1016/j.jprot.2013.02.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Revised: 02/01/2013] [Accepted: 02/02/2013] [Indexed: 10/27/2022]
Abstract
The method of radiolysis is based upon the interaction of ionising radiation with the solvent (water). One can form the same free radicals as in conditions of oxidative stress ((•)OH, O2(•)(-), NO2(•)…). Moreover, the quantity of reactive oxygen (ROS) or nitrogen (RNS) species formed in the irradiated medium can be calculated knowing the dose and the radiation chemical yield, G, thus this method is quantitative. The use of the method of radiolysis has provided a wealth of data, especially about the kinetics of the oxidation by various free radicals and their mechanisms, the identification of transients formed, their lifetimes and the possibility to repair them by the so-called antioxidants. In this review we have collected the most recent data about protein oxidation that might be useful to a proteomic approach. This article is part of a Special Issue entitled: Posttranslational Protein modifications in biology and Medicine.
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Affiliation(s)
- Chantal Houée-Levin
- Laboratoire de Chimie Physique, UMR 8000, Université Paris Sud, (France), also at CNRS, France
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39
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Filipiak P, Hug GL, Bobrowski K, Pedzinski T, Kozubek H, Marciniak B. Sensitized photooxidation of s-methylglutathione in aqueous solution: intramolecular (S∴O) and (S∴N) bonded species. J Phys Chem B 2013; 117:2359-68. [PMID: 23347005 DOI: 10.1021/jp312184e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nanosecond laser flash photolysis was used to generate sulfur radical cations of the thioether, S-methylglutathione (S-Me-Glu), via the one-electron oxidation of this thioether by triplet 4-carboxybenzophenone. The purpose of this investigation was to follow the neighboring group effects resulting from the interactions between the sulfur radical cationic sites and nearby lone-pair electrons on heteroatoms within the radical cation, especially the electron lone-pairs on heteroatoms in the peptide bonds. The tripeptide, S-Me-Glu, offers several possible competing neighboring group effects that are characterized in this work. Quantum yields of the various radicals and three-electron bonded (both intramolecular and intermolecular) species were determined. The pH dependence of photoinduced decarboxylation yields was used as evidence for the identification of a nine-membered ring, sulfur-nitrogen, three-electron bonded species. The mechanisms of the secondary reactions of the radicals and radical cations were characterized by resolving their overlapping transient-absorption spectra and following their kinetic behavior. In particular, sulfur-oxygen and sulfur-nitrogen three-electron bonded species were identified where the oxygen and nitrogen atoms were in the peptide bonds.
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Affiliation(s)
- Piotr Filipiak
- Faculty of Chemistry, Adam Mickiewicz University, 61-614 Poznan, Poland.
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40
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Mozziconacci O, Ji JA, Wang YJ, Schöneich C. Metal-catalyzed oxidation of protein methionine residues in human parathyroid hormone (1-34): formation of homocysteine and a novel methionine-dependent hydrolysis reaction. Mol Pharm 2013; 10:739-55. [PMID: 23289936 DOI: 10.1021/mp300563m] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The oxidation of PTH(1-34) catalyzed by ferrous ethylenediaminetetraacetic acid (EDTA) is site-specific. The oxidation of PTH(1-34) is localized primarily to the residues Met[8] and His[9]. Beyond the transformation of Met[8] and His[9] into methionine sulfoxide and 2-oxo-histidine, respectively, we observed a hydrolytic cleavage between Met[8] and His[9]. This hydrolysis requires the presence of Fe(II) and oxygen and can be prevented by diethylenetriaminepentaacetic acid (DTPA) and phosphate buffer. Conditions leading to this site-specific hydrolysis also promote the transformation of Met[8] into homocysteine, indicating that the hydrolysis and transformation of homocysteine may proceed through a common intermediate.
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Affiliation(s)
- Olivier Mozziconacci
- Department of Pharmaceutical Chemistry, 2095 Constant Avenue, University of Kansas , Lawrence, Kansas 66047, United States
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41
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Lewandowska-Andralojc A, Kazmierczak F, Hug GL, Hörner G, Marciniak B. Photoinduced CC-coupling Reactions of Rigid Diastereomeric Benzophenone-Methionine Dyads. Photochem Photobiol 2012; 89:14-23. [DOI: 10.1111/j.1751-1097.2012.01210.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2012] [Accepted: 07/18/2012] [Indexed: 11/27/2022]
Affiliation(s)
| | | | | | - Gerald Hörner
- Institut für Chemie; Technische Universität Berlin; Berlin; Germany
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42
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Bergès J, de Oliveira P, Fourré I, Houée-Levin C. The one-electron reduction potential of methionine-containing peptides depends on the sequence. J Phys Chem B 2012; 116:9352-62. [PMID: 22747412 DOI: 10.1021/jp304741e] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The protein residue methionine (Met) is one of the main targets of oxidizing free radicals produced in oxidative stress. Despite its biological importance, the mechanism of the oxidation of this residue is still partly unknown. In particular the one-electron redox potentials of the couple Met(•+)/Met have not been measured. In this work, two approaches, experimental as well as theoretical, were applied for three dipeptides L-Met L-Gly, L-Gly L-Met and L-Met L-Met. Measurements by electrochemistry indicated differences in the ease of oxidation. Two DFT methods (BH&HLYP and PBE0) with two basis sets (6-31G(d) and 6-311+G(2d,2p)) were used to determine the redox potentials of Met in these peptides present in different conformations. In agreement with experimental results, we show that they vary with the sequence and the spatial structure of the peptide, most of the values being higher than 1 V (up to 2 V) vs NHE.
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Affiliation(s)
- Jacqueline Bergès
- Laboratoire de Chimie Théorique, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 5, France.
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43
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Lanzalunga O, Lapi A. Recent photo- and radiation chemical studies of sulfur radical cations. J Sulphur Chem 2011. [DOI: 10.1080/17415993.2011.619536] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Osvaldo Lanzalunga
- a Dipartimento di Chimica and IMC-CNR, Sezione Meccanismi di Reazione , Università “La Sapienza” , P.le A. Moro, 5 I-00185 , Rome , Italy
| | - Andrea Lapi
- a Dipartimento di Chimica and IMC-CNR, Sezione Meccanismi di Reazione , Università “La Sapienza” , P.le A. Moro, 5 I-00185 , Rome , Italy
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44
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Pulse radiolysis studies of intermolecular charge transfers involving tryptophan and three-electron-bonded intermediates derived from methionine. RESEARCH ON CHEMICAL INTERMEDIATES 2011. [DOI: 10.1007/s11164-011-0331-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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45
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Characterization by mass spectrometry and IRMPD spectroscopy of the sulfoxide group in oxidized methionine and related compounds. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2010.12.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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46
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Argyrakis W, Köppl C, Werner HJ, Frey W, Baro A, Laschat S. A combined quantum mechanical and experimental approach towards chiral diketopiperazine hydroperoxides. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1809] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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47
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Fourré I, Bergès J, Houée-Levin C. Structural and Topological Studies of Methionine Radical Cations in Dipeptides: Electron Sharing in Two-Center Three-Electron Bonds. J Phys Chem A 2010; 114:7359-68. [DOI: 10.1021/jp911983a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Isabelle Fourré
- Université Pierre et Marie Curie, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France, CNRS, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France, Université Paris Descartes, F-75006 Paris, France, and Université Paris Sud, UMR 8000, Laboratoire de Chimie Physique, F-91405 Orsay, also at CNRS F-91405 Orsay, France
| | - Jacqueline Bergès
- Université Pierre et Marie Curie, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France, CNRS, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France, Université Paris Descartes, F-75006 Paris, France, and Université Paris Sud, UMR 8000, Laboratoire de Chimie Physique, F-91405 Orsay, also at CNRS F-91405 Orsay, France
| | - Chantal Houée-Levin
- Université Pierre et Marie Curie, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France, CNRS, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France, Université Paris Descartes, F-75006 Paris, France, and Université Paris Sud, UMR 8000, Laboratoire de Chimie Physique, F-91405 Orsay, also at CNRS F-91405 Orsay, France
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48
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Wisniowski PB, Hug GL, Pogocki D, Bobrowski K. Efficient α-(Alkylthio)alkyl-Type Radical Formation in •OH-Induced Oxidation of α-(Methylthio)acetamide. J Phys Chem A 2009; 114:105-16. [DOI: 10.1021/jp9071026] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Pawel B Wisniowski
- Centre of Radiation Research and Technology, Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland
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49
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Glass RS, Hug GL, Schöneich C, Wilson GS, Kuznetsova L, Lee TM, Ammam M, Lorance E, Nauser T, Nichol GS, Yamamoto T. Neighboring amide participation in thioether oxidation: relevance to biological oxidation. J Am Chem Soc 2009; 131:13791-805. [PMID: 19772365 DOI: 10.1021/ja904895u] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
To investigate neighboring amide participation in thioether oxidation, which may be relevant to brain oxidative stress accompanying beta-amyloid peptide aggregation, conformationally constrained methylthionorbornyl derivatives with amido moieties were synthesized and characterized, including an X-ray crystallographic study of one of them. Electrochemical oxidation of these compounds, studied by cyclic voltammetry, revealed that their oxidation peak potentials were less positive for those compounds in which neighboring group participation was geometrically possible. Pulse radiolysis studies provided evidence for bond formation between the amide moiety and sulfur on one-electron oxidation in cases where the moieties are juxtaposed. Furthermore, molecular constraints in spiro analogues revealed that S-O bonds are formed on one-electron oxidation. DFT calculations suggest that isomeric sigma*(SO) radicals are formed in these systems.
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Affiliation(s)
- Richard S Glass
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721, USA.
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50
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Factor analysis of transient spectra. Free radicals in cyclic dipeptides containing methionine. RESEARCH ON CHEMICAL INTERMEDIATES 2009. [DOI: 10.1007/s11164-009-0044-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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