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Wang J, Zhou X, Ju S, Cai R, Roopesh MS, Pan D, Du L. Influence of atmospheric pressure plasma jet on the structural, functional and digestive properties of chickpea protein isolate. Food Res Int 2023; 174:113565. [PMID: 37986520 DOI: 10.1016/j.foodres.2023.113565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 10/05/2023] [Accepted: 10/09/2023] [Indexed: 11/22/2023]
Abstract
Chickpea protein (CPI) is a promising dietary protein and potential substitute for soy protein in food product development due to its high protein content and low allergenicity. However, CPI possesses denser tertiary and quaternary structures and contains certain amount of anti-nutritional factors, both of which constrain its functional properties and digestibility. The objective of this study was to assess the effectiveness of atmospheric pressure plasma jets (APPJ) as a non-thermal method for enhancing the functional characteristics and digestibility of CPI. In this study, the reactive oxygen and nitrogen species generated by the APPJ treatment led to protein oxidation and increased carbonyl and di-tyrosine contents. At the same time, the secondary, tertiary and microstructural structures of CPI were changed. The solubility, water holding capacity, fat absorption capacity, emulsifying capacity and foaming capacity of CPI were significantly improved after 30 s APPJ treatment, and a higher storage modulus in rheology was observed. Additionally, it was observed that the in vitro protein digestibility (IVPD) of APPJ-treated CPI increased significantly from 44.85 ± 0.6 % to 50.2 ± 0.59 % following in vitro simulated gastric and intestinal digestion, marking a noteworthy improvement of 11.93 %. These findings indicate that APPJ processing can enhance the functional and digestive properties of CPI through structural modification and expand its potential applications within the food industry.
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Affiliation(s)
- Jian Wang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo 315211, China; Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315800, China
| | - Xinyi Zhou
- Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315800, China
| | - Shilong Ju
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo 315211, China; Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315800, China
| | - Ruiyi Cai
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo 315211, China; Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315800, China
| | - M S Roopesh
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton AB T6G 2P5, Canada
| | - Daodong Pan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo 315211, China; Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315800, China
| | - Lihui Du
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo 315211, China; Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315800, China.
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2
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Gatin A, Duchambon P, van der Rest G, Billault I, Sicard-Roselli C. Protein Dimerization via Tyr Residues: Highlight of a Slow Process with Co-Existence of Numerous Intermediates and Final Products. Int J Mol Sci 2022; 23:ijms23031174. [PMID: 35163094 PMCID: PMC8835203 DOI: 10.3390/ijms23031174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/17/2022] [Accepted: 01/19/2022] [Indexed: 02/06/2023] Open
Abstract
Protein dimerization via tyrosine residues is a crucial process in response to an oxidative attack, which has been identified in many ageing-related pathologies. Recently, it has been found that for isolated tyrosine amino acid, dimerization occurs through three types of tyrosine–tyrosine crosslinks and leads to at least four final products. Herein, considering two protected tyrosine residues, tyrosine-containing peptides and finally proteins, we investigate the dimerization behavior of tyrosine when embedded in a peptidic sequence. After azide radical oxidation and by combining UPLC-MS and H/D exchange analyzes, we were able to evidence: (i) the slow kinetics of Michael Addition Dimers (MAD) formation, i.e., more than 48 h; (ii) the co-existence of intermediates and final cyclized dimer products; and (iii) the probable involvement of amide functions to achieve Michael additions even in proteins. This raises the question of the possible in vivo existence of both intermediates and final entities as well as their toxicity and the potential consequences on protein structure and/or function.
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Affiliation(s)
- Anouchka Gatin
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR 8000, CEDEX, 91405 Orsay, France; (A.G.); (G.v.d.R.); (I.B.)
| | - Patricia Duchambon
- Université Paris-Saclay, CNRS, Institut Curie UMR 9187, INSERM U1196, CEDEX, 91405 Orsay, France;
| | - Guillaume van der Rest
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR 8000, CEDEX, 91405 Orsay, France; (A.G.); (G.v.d.R.); (I.B.)
| | - Isabelle Billault
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR 8000, CEDEX, 91405 Orsay, France; (A.G.); (G.v.d.R.); (I.B.)
| | - Cécile Sicard-Roselli
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR 8000, CEDEX, 91405 Orsay, France; (A.G.); (G.v.d.R.); (I.B.)
- Correspondence: ; Tel.: +33-1-69-15-77-32
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3
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Rodrigues AC, de M. Camargo LT, Francisco Lopes Y, Sallum LO, Napolitano HB, Camargo AJ. Aqueous solvation study of melatonin using ab initio molecular dynamics. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Wan H, Li H, Lei Y, Xie P, Zhang S, Wang H, Liu X, Sun B. Influence of stewing conditions on tenderness and protein structure in beef. J FOOD PROCESS PRES 2021. [DOI: 10.1111/jfpp.15208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Hongbing Wan
- Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China
| | - Haipeng Li
- Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China
| | - Yuanhua Lei
- Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China
| | - Peng Xie
- Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China
| | - Songshan Zhang
- Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China
| | - Huan Wang
- Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China
| | - Xuan Liu
- Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China
| | - Baozhong Sun
- Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China
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5
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Gatin A, Billault I, Duchambon P, Van der Rest G, Sicard-Roselli C. Oxidative radicals (HO • or N 3•) induce several di-tyrosine bridge isomers at the protein scale. Free Radic Biol Med 2021; 162:461-470. [PMID: 33217505 DOI: 10.1016/j.freeradbiomed.2020.10.324] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/27/2020] [Accepted: 10/31/2020] [Indexed: 11/17/2022]
Abstract
Among protein oxidative damages, di-tyrosine bridges formation has been evidenced in many neuropathological diseases. Combining oxidative radical production by gamma radiolysis with very performant chromatographic separation coupled to mass spectrometry detection, we brought into light new insights of tyrosine dimerization. Hydroxyl and azide radical tyrosine oxidation leading to di-tyrosine bridges formation was studied for different biological compounds: a full-length protein (Δ25-centrin 2), a five amino acid peptide (KTSLY) and free tyrosine. We highlighted that both radicals generate high proportion of dimers even for low doses. Surprisingly, no less than five different di-tyrosine isomers were evidenced for the protein and the peptide. For tyrosine alone, at least four distinct dimers were evidenced. These results raise some questions about their respective role in vivo and hence their relative toxicity. Also, as di-tyrosine is often used as a biomarker, a better knowledge of the type of dimer detected in vivo is now required.
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Affiliation(s)
- Anouchka Gatin
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR 8000, 91405, Orsay Cedex, France
| | - Isabelle Billault
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR 8000, 91405, Orsay Cedex, France
| | - Patricia Duchambon
- CNRS UMR9187, INSERM U1196, Institut Curie, Université Paris Saclay, 91405, Orsay Cedex, France
| | - Guillaume Van der Rest
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR 8000, 91405, Orsay Cedex, France
| | - Cécile Sicard-Roselli
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR 8000, 91405, Orsay Cedex, France.
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6
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Laccase-catalyzed bioconjugation of tyrosine-tagged functional proteins. J Biosci Bioeng 2018; 126:559-566. [DOI: 10.1016/j.jbiosc.2018.05.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 05/01/2018] [Accepted: 05/18/2018] [Indexed: 11/20/2022]
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7
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Minamihata K, Yamaguchi S, Nakajima K, Nagamune T. Tyrosine Coupling Creates a Hyperbranched Multivalent Protein Polymer Using Horseradish Peroxidase via Bipolar Conjugation Points. Bioconjug Chem 2016; 27:1348-59. [DOI: 10.1021/acs.bioconjchem.6b00138] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Kosuke Minamihata
- Department
of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Sou Yamaguchi
- Department
of Bioengineering, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Kei Nakajima
- Department
of Bioengineering, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Teruyuki Nagamune
- Department
of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
- Department
of Bioengineering, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
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8
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Biswal HS, Bhattacharyya S, Bhattacherjee A, Wategaonkar S. Nature and strength of sulfur-centred hydrogen bonds: laser spectroscopic investigations in the gas phase and quantum-chemical calculations. INT REV PHYS CHEM 2015. [DOI: 10.1080/0144235x.2015.1022946] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Bhattacharyya S, Wategaonkar S. ZEKE Photoelectron Spectroscopy of p-Fluorophenol···H2S/H2O Complexes and Dissociation Energy Measurement Using the Birge–Sponer Extrapolation Method. J Phys Chem A 2014; 118:9386-96. [DOI: 10.1021/jp505393p] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Surjendu Bhattacharyya
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
| | - Sanjay Wategaonkar
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
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10
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Dumas VG, Defelipe LA, Petruk AA, Turjanski AG, Marti MA. QM/MM study of the C-C coupling reaction mechanism of CYP121, an essential cytochrome p450 of Mycobacterium tuberculosis. Proteins 2013; 82:1004-21. [PMID: 24356896 DOI: 10.1002/prot.24474] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 10/15/2013] [Accepted: 11/04/2013] [Indexed: 11/06/2022]
Abstract
Among 20 p450s of Mycobacterium tuberculosis (Mt), CYP121 has received an outstanding interest, not only due to its essentiality for bacterial viability but also because it catalyzes an unusual carbon-carbon coupling reaction. Based on the structure of the substrate bound enzyme, several reaction mechanisms were proposed involving first Tyr radical formation, second Tyr radical formation, and C-C coupling. Key and unknown features, being the nature of the species that generate the first and second radicals, and the role played by the protein scaffold each step. In the present work we have used classical and quantum based computer simulation methods to study in detail its reaction mechanism. Our results show that substrate binding promotes formation of the initial oxy complex, Compound I is the responsible for first Tyr radical formation, and that the second Tyr radical is formed subsequently, through a PCET reaction, promoted by the presence of key residue Arg386. The final C-C coupling reaction possibly occurs in bulk solution, thus yielding the product in one oxygen reduction cycle. Our results thus contribute to a better comprehension of MtCYP121 reaction mechanism, with direct implications for inhibitor design, and also contribute to our general understanding of these type of enzymes.
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Affiliation(s)
- Victoria G Dumas
- Departamento de Quimica Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes, 2160, C1428EGA, Ciudad Autónoma de Buenos Aires, Argentina; Instituto de Química Física de los Materiales Medio Ambiente y Energia (INQUIMAE), UBA-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Intendente Güiraldes, 2160, C1428EGA, Ciudad Autónoma de Buenos Aires, Argentina
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11
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García S, Cuscó C, Brissos RF, Torrents E, Caubet A, Gamez P. Dual role of Cu²⁺ ions on the aggregation and degradation of soluble Aβ oligomers and protofibrils investigated by fluorescence spectroscopy and AFM. J Inorg Biochem 2012; 116:26-36. [PMID: 23010326 DOI: 10.1016/j.jinorgbio.2012.07.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Revised: 06/11/2012] [Accepted: 07/05/2012] [Indexed: 11/20/2022]
Abstract
The neuropathological character of copper(II) ions (Cu(2+)) upon interaction with soluble human amyloid-β(1-42) that subsequently generates senile plaques and/or reactive oxygen species (ROS) is considered as one of the very important features of Alzheimer's disease. The present study carried out by using fluorescence spectroscopy and atomic-force microscopy (AFM) indeed confirms the dual role played by Cu(2+), namely as mediator of protein aggregation and as generator of ROS leading to irreversible protein alteration, which most likely involve two distinct copper-binding sites. The AFM investigations clearly evidence the copper-induced aggregation of Aβ oligomers and protofibrils, while comparative fluorescence measurements with copper and zinc reveals the crucial involvement of redox-active copper in the generation of Aβ-cross-linked structures.
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Affiliation(s)
- Silvia García
- Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
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12
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Li JN, Pu M, Fang DC, Wei M, He J, Evans DG. Theoretical study of two photochemical pathways of l-tyrosine isomerization. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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13
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Yeung CS, Dong VM. Catalytic dehydrogenative cross-coupling: forming carbon-carbon bonds by oxidizing two carbon-hydrogen bonds. Chem Rev 2011; 111:1215-92. [PMID: 21391561 DOI: 10.1021/cr100280d] [Citation(s) in RCA: 3381] [Impact Index Per Article: 260.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Charles S Yeung
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
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14
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Biswal HS, Shirhatti PR, Wategaonkar S. O−H···O versus O−H···S Hydrogen Bonding. 2. Alcohols and Thiols as Hydrogen Bond Acceptors. J Phys Chem A 2010; 114:6944-55. [DOI: 10.1021/jp102346n] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Himansu S. Biswal
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, India 400 005
| | - Pranav R. Shirhatti
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, India 400 005
| | - Sanjay Wategaonkar
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, India 400 005
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15
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Biswal HS, Shirhatti PR, Wategaonkar S. O−H···O versus O−H···S Hydrogen Bonding I: Experimental and Computational Studies on the p-Cresol·H2O and p-Cresol·H2S Complexes. J Phys Chem A 2009; 113:5633-43. [DOI: 10.1021/jp9009355] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Himansu S. Biswal
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
| | - Pranav R. Shirhatti
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
| | - Sanjay Wategaonkar
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
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16
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Zhang Y, Illarionov B, Bacher A, Fischer M, Georg GI, Ye QZ, Velde DV, Fanwick PE, Song Y, Cushman M. A novel lumazine synthase inhibitor derived from oxidation of 1,3,6,8-tetrahydroxy-2,7-naphthyridine to a tetraazaperylenehexaone derivative. J Org Chem 2007; 72:2769-76. [PMID: 17348709 PMCID: PMC2526313 DOI: 10.1021/jo062246d] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Air oxidation of 1,3,6,8-tetrahydroxy-2,7-naphthyridine afforded 2,5,8,11-tetraaza-5,11-dihydro-4,10-dihydroxyperylene-1,3,6,7,9,12-hexaone. X-ray crystallography of the product revealed that it exists in the meso form in the solid state. The mechanism of product formation most likely involves oxidative phenolic coupling and oxidation. The product proved to be a competitive inhibitor of Schizosaccharomyces pombe lumazine synthase with a Ki of 66+/-13 microM in Tris buffer and 22+/-4 microM in phosphate buffer. This is significantly more potent than the reactant (Ki 350+/-76 microM, competitive inhibition), which had previously been identified as a lumazine synthase inhibitor by high-throughput screening. Ab initio calculations indicate that the meso form is slightly less stable than the enantiomeric form, and that the two forms interconvert rapidly at room temperature.
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18
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Ali FE, Leung A, Cherny RA, Mavros C, Barnham KJ, Separovic F, Barrow CJ. Dimerisation of N-acetyl-L-tyrosine ethyl ester and Abeta peptides via formation of dityrosine. Free Radic Res 2006; 40:1-9. [PMID: 16298754 DOI: 10.1080/10715760500329721] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Alzheimer's disease (AD) is characterised by the formation of amyloid deposits composed primarily of the amyloid beta-peptide (Abeta). This peptide has been shown to bind redox active metals ions such as copper and iron, leading to the production of reactive oxygen species (ROS) and formation of hydrogen peroxide (H(2)O(2)). The generation of H(2)O(2) has been linked with Abeta neurotoxicity and neurodegeneration in AD. Because of the relative stability of a tyrosyl radical, the tyrosine residue (Tyr-10) is believed to be critical to the neurotoxicity of Abeta. This residue has also been shown to be important to Abeta aggregation and amyloid formation. It is possible that the formation of an Abeta tyrosyl radical leads to increased aggregation via the formation of dityrosine as an early aggregation step, which is supported by the identification of dityrosine in amyloid plaque. The role of dityrosine formation in Abeta aggregation and neurotoxicity is as yet undetermined, partly because there are no facile methods for the synthesis of Abeta dimers containing dityrosine. Here we report the use of horseradish peroxidase and H(2)O(2) to dimerise N-acetyl-L-tyrosine ethyl ester and apply the optimised conditions for dityrosine formation to fully unprotected Abeta peptides. We also report a simple fluorescent plate reader method for monitoring Abeta dimerisation via dityrosine formation.
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Affiliation(s)
- Feda E Ali
- School of Chemistry, University of Melbourne, VIC, 3010, Australia
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19
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Exploration of the full conformational landscapes of gaseous aromatic amino acid phenylalanine: An ab initio study. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.theochem.2005.10.043] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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20
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Asatryan R, Davtyan A, Khachatryan L, Dellinger B. Molecular Modeling Studies of the Reactions of Phenoxy Radical Dimers: Pathways To Dibenzofurans. J Phys Chem A 2005; 109:11198-205. [PMID: 16331903 DOI: 10.1021/jp053047l] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The B3LYP hybrid density functional computational technique was applied to describe the sequence of phenoxy radicals coupling reactions leading to the formation of dibenzofurans. Reaction kinetic parameters were estimated for key reactions. Aromatization of bis-keto dimers of phenoxy radicals followed by intermediate dehydration or dehydroxylation was demonstrated to be a strongly stereoselective process. While the S,S-diastereomer of the ortho-C//ortho-C keto dimer forms (o,o')-dihydroxybiphenyl, a known dibenzofuran intermediate, via inter-ring hydrogen transfer reaction, the less stable R,S-stereoisomer can easily be transformed into another 5-hydroxyl-4,5-cyclohexadiene-2,3-benzofuran intermediate that provides an energetically more favorable pathway for formation of dibenzofuran. The possible channels of radical-chain processes that convert these intermediates to dibenzofuran and polychlorinated dibenzofurans are discussed.
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Affiliation(s)
- R Asatryan
- Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana, 70803, USA.
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21
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Hanft F, Koehler P. Quantitation of dityrosine in wheat flour and dough by liquid chromatography-tandem mass spectrometry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2005; 53:2418-2423. [PMID: 15796572 DOI: 10.1021/jf048005t] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A method for the quantitation of dityrosine in wheat flour and dough by high-performance liquid chromatography/tandem mass spectrometry (HPLC-MS/MS) using an isotope dilution assay with the internal standard 3,3'-(13)C(2)-dityrosine in the single-reaction monitoring mode was developed. The method consisted of the release of protein-bound dityrosine by hydrolysis in 4 mol/L hydrochloric acid/8.9 mol/L propionic acid for 24 h at 110 degrees C after addition of the internal standard, cleanup by C(18) solid-phase extraction, and HPLC-MS/MS. The limit of detection of dityrosine was 80 ng/g of sample (0.22 nmol/g), and the limit of quantitation was 270 ng/g of sample (0.75 nmol/g). The method was sensitive enough to analyze wheat flour and dough and to study the effect of flour improvers on the dityrosine content. Furthermore, the effect of the mixing time was studied. The dityrosine concentration in the flour was 0.66 nmol/g. After we mixed a dough to peak consistency, the dityrosine concentration doubled and remained constant on further mixing. Overdoses of hydrogen peroxide and hexose oxidase (HOX, E.C. 1.1.3.5) resulted in a strongly increased dityrosine content, whereas no increase of the dityrosine concentration was found after the addition of ascorbic acid and potassium bromate. Calculation of the percentage of dimeric tyrosine showed that less than 0.1% of the tyrosine residues of wheat protein were cross-linked. Therefore, dityrosine residues seem to play only a very minor role in the structure of wheat gluten.
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Affiliation(s)
- Franziska Hanft
- Deutsche Forschungsanstalt für Lebensmittelchemie and Hans-Dieter-Belitz-Institut für Mehl- und Eiweissforschung, Lichtenbergstrasse 4, 85748 Garching, Germany
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22
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Ali FE, Separovic F, Barrow CJ, Cherny RA, Fraser F, Bush AI, Masters CL, Barnham KJ. Methionine regulates copper/hydrogen peroxide oxidation products of Aβ. J Pept Sci 2005; 11:353-60. [PMID: 15635660 DOI: 10.1002/psc.626] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Metal-catalysed oxidation (MCO) may play a causative role in the pathogenesis of Alzheimer's disease (AD). Amyloid beta peptide (Abeta), the major biomarker of AD, in the presence of copper ions reduces Cu(2+) to Cu(+) and catalyses the formation of H(2)O(2) that subsequently induces radicals through Fenton chemistry. Abeta is also subject to attack by free radicals, where the presence of Cu(2+) in conjunction with H(2)O(2) catalyses oxygenation, primarily at the methionine sulfur atom. This work investigates MCO of Abeta, to gain further insight into the role of oxidative stress in AD. By combining a fluorescence assay with gel electrophoresis to monitor MCO reactions of Abeta (1-28) in the presence and absence of methionine it was determined that methionine can both protect some residues against MCO and promote the oxidation of Tyr(10) specifically. Electrospray ionization mass spectrometric analysis of methionine MCO products indicated the formation of methionine sulfoxide, methionine sulfone and related hydroxylated products. Similar products could be formed from the oxidation of Met(35) of Abeta and may relate to changes in properties of the peptide following MCO.
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Affiliation(s)
- Feda E Ali
- School of Chemistry, University of Melbourne, VIC 3010, Australia
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23
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Kwok WM, Chan PY, Phillips DL. Direct Observation of the 2-Fluorenylnitrene and 4-Methoxyphenylnitrene Reactions with Water Using Picosecond Kerr-Gated Time-Resolved Resonance Raman Spectroscopy. J Phys Chem B 2004. [DOI: 10.1021/jp0467292] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wai Ming Kwok
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., People's Republic of China
| | - Pik Ying Chan
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., People's Republic of China
| | - David Lee Phillips
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., People's Republic of China
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24
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Khachatryan L, Asatryan R, Dellinger B. An Elementary Reaction Kinetic Model of the Gas-Phase Formation of Polychlorinated Dibenzofurans from Chlorinated Phenols. J Phys Chem A 2004. [DOI: 10.1021/jp047762r] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lavrent Khachatryan
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, and Department of Pharmaceutical and Toxicological Chemistry, Yerevan State Medical University, Yerevan 375025, Armenia
| | - Ruben Asatryan
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, and Department of Pharmaceutical and Toxicological Chemistry, Yerevan State Medical University, Yerevan 375025, Armenia
| | - Barry Dellinger
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, and Department of Pharmaceutical and Toxicological Chemistry, Yerevan State Medical University, Yerevan 375025, Armenia
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25
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Ali FE, Barnham KJ, Barrow CJ, Separovic F. Metal catalyzed oxidation of tyrosine residues by different oxidation systems of copper/hydrogen peroxide. J Inorg Biochem 2004; 98:173-84. [PMID: 14659647 DOI: 10.1016/j.jinorgbio.2003.10.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Metal-catalysed oxidation (MCO) reactions result in the formation of reactive oxygen species (ROS) in biological systems. These ROS cause oxidative stress that contributes to a number of pathological processes leading to a variety of diseases. Tyrosine is one residue that is very susceptible to oxidative modification and the formation of dityrosine (DT) and 3,4-dihydroxyphenylalanine (DOPA) have been widely reported in a number of diseases. However, the mechanisms of MCO of tyrosine in biological systems are poorly understood and require further investigation. In this study we investigated the mechanism of DT and DOPA formation by MCO using N-acetyl tyrosine ethyl ester as a model for tyrosine in proteins and peptides. The results showed that DT formation could be observed upon Cu2+/H2O2 oxidation at pH 7.4. Our results indicate that it is unlikely to be via Fenton chemistry since Cu+/H2O2 oxidative conditions did not lead to the formation of DT.
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Affiliation(s)
- Feda E Ali
- School of Chemistry, University of Melbourne, Melbourne, VIC 3010, Australia
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26
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Copper catalysed oxidation of amino acids and Alzheimer's disease. Int J Pept Res Ther 2003. [DOI: 10.1007/s10989-004-2391-x] [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]
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27
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Ali FE, Barnham KJ, Barrow CJ, Separovic F. Copper catalysed oxidation of amino acids and Alzheimer's disease. ACTA ACUST UNITED AC 2003. [DOI: 10.1007/bf02442571] [Citation(s) in RCA: 8] [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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28
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Ong SY, Chan PY, Zhu P, Leung KH, Phillips DL. Time-Resolved Resonance Raman Study of Triplet Arylnitrenes and Their Dimerization Reaction. J Phys Chem A 2003. [DOI: 10.1021/jp021468m] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shing Yau Ong
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - Pik Ying Chan
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - Peizhi Zhu
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - King Hung Leung
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - David Lee Phillips
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
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29
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Ban F, Lundqvist MJ, Boyd RJ, Eriksson LA. Theoretical studies of the cross-linking mechanisms between cytosine and tyrosine. J Am Chem Soc 2002; 124:2753-61. [PMID: 11890827 DOI: 10.1021/ja011528m] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
DNA-protein cross-linking is one of the many DNA lesions mediated by hydroxyl radicals, the most damaging among the reactive oxygen species in biological systems. Density functional theory methods are employed to investigate the complex reaction mechanisms of the formation of cytosine-tyrosine cross-links as observed in gamma-irradiated aqueous solutions of cytosine and tyrosine, as well as in gamma-irradiated nucleohistone. The majority of the radical addition mechanisms considered are found to have significant barriers and therefore to be thermodynamically unfavorable for the formation of the initial cross-linked product. Our calculated reaction potential energy surfaces suggest that a feasible complete mechanism consists of radical combination forming the initial cross-linked product, a hydrogen shuffle within the initial cross-linked product, and an acid-catalyzed dehydration reaction. Water and hydrogen-bonding interactions are suggested to play a key role in catalyzing the hydrogen-transfer step of the reaction.
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Affiliation(s)
- Fuqiang Ban
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4J3, Canada
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30
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Clarkson J, Smith DA. UV Raman evidence of a tyrosine in apo-human serum transferrin with a low pK(a) that is elevated upon binding of sulphate. FEBS Lett 2001; 503:30-4. [PMID: 11513849 DOI: 10.1016/s0014-5793(01)02687-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The binding of sulphate to human serum apo-transferrin has been examined by ultraviolet absorption and ultraviolet resonance Raman difference spectroscopies between pH 6.0 and 9.0. The ultraviolet absorption data reveals a negative feature at 245 nm that increases in magnitude with pH, with an apparent pK(a) of 7.57, which the Raman difference data reveals to be due to tyrosine. The pK(a) of this tyrosine is unusually low and is measured at 7.84 by the Raman difference method and is elevated to greater than 9.0 upon addition of sulphate. Previous studies on the N-lobe imply that Tyr 188 is the tyrosine with a low pK(a) and also that Arg 124 is the primary binding site for the sulphate. The functional relevance may be that with sulphate bound, both carbonate binding and the deprotonation of Tyr will be disfavoured, and as a result so is iron binding.
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Affiliation(s)
- J Clarkson
- Department of Physics and Astronomy, University of Leeds, LS2 9JT, Leeds, UK.
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