1
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Youssef MM, Szot CW, Folz J, Collier LM, Kweon HK, DeFiglia SA, Ayad MF, Hussein LA, Abdel-Ghany MF, Hakansson K. Electron Capture vs Transfer Dissociation for Site Determination of Tryptic Peptide Tyrosine Sulfation: Direct Detection of Fibrinogen Sulfation Sites and Identification of Novel Isobaric Interferences. J Proteome Res 2024; 23:2386-2396. [PMID: 38900499 PMCID: PMC11231624 DOI: 10.1021/acs.jproteome.4c00072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
Tyrosine sulfation, an understudied but crucial post-translational modification, cannot be directly detected in conventional nanoflow liquid chromatography-tandem mass spectrometry (nanoLC-MS/MS) due to the extreme sulfate lability. Here, we report the detection of sulfate-retaining fragments from LC-electron capture dissociation (ECD) and nanoLC-electron transfer higher energy collision dissociation (EThcD). Sulfopeptide candidates were identified by Proteome Discoverer and MSFragger analysis of nanoLC-HCD MS/MS data and added to inclusion lists for LC-ECD or nanoLC-EThcD MS/MS. When this approach failed, targeted LC-ECD with fixed m/z isolation windows was performed. For the plasma protein fibrinogen, the known pyroglutamylated sulfopeptide QFPTDYDEGQDDRPK from the beta chain N-terminus was identified despite a complete lack of sulfate-containing fragment ions. The peptide QVGVEHHVEIEYD from the gamma-B chain C-terminus was also identified as sulfated or phosphorylated. This sulfopeptide is not annotated in Uniprot but was previously reported. MSFragger further identified a cysteine-containing peptide from the middle of the gamma chain as sulfated and deamidated. NanoLC-EThcD and LC-ECD MS/MS confirmed the two former sulfopeptides via sulfate-retaining fragment ions, whereas an unexpected fragmentation pattern was observed for the third sulfopeptide candidate. Manual interpretation of the LC-ECD spectrum revealed two additional isobaric identifications: a trisulfide-linked cysteinyl-glycine or a carbamidomethyl-dithiothreiotol covalent adduct. Synthesis of such adducts confirmed the latter identity.
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Affiliation(s)
- Menatallah M Youssef
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Ain Shams University, Cairo 11566, Egypt
| | - Carson W Szot
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Jeff Folz
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Luke M Collier
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Hye Kyong Kweon
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Steven A DeFiglia
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Miriam F Ayad
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Ain Shams University, Cairo 11566, Egypt
| | - Lobna A Hussein
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Ain Shams University, Cairo 11566, Egypt
| | - Maha F Abdel-Ghany
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Ain Shams University, Cairo 11566, Egypt
| | - Kristina Hakansson
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
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2
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Tyrosine-O-sulfation is a widespread affinity enhancer among thrombin interactors. Biochem Soc Trans 2022; 50:387-401. [PMID: 34994377 DOI: 10.1042/bst20210600] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 12/07/2021] [Accepted: 12/09/2021] [Indexed: 12/24/2022]
Abstract
Tyrosine-O-sulfation is a common post-translational modification (PTM) of proteins following the cellular secretory pathway. First described in human fibrinogen, tyrosine-O-sulfation has long been associated with the modulation of protein-protein interactions in several physiological processes. A number of relevant interactions for hemostasis are largely dictated by this PTM, many of which involving the serine proteinase thrombin (FIIa), a central player in the blood-clotting cascade. Tyrosine sulfation is not limited to endogenous FIIa ligands and has also been found in hirudin, a well-known and potent thrombin inhibitor from the medicinal leech, Hirudo medicinalis. The discovery of hirudin led to successful clinical application of analogs of leech-inspired molecules, but also unveiled several other natural thrombin-directed anticoagulant molecules, many of which undergo tyrosine-O-sulfation. The presence of this PTM has been shown to enhance the anticoagulant properties of these peptides from a range of blood-feeding organisms, including ticks, mosquitos and flies. Interestingly, some of these molecules display mechanisms of action that mimic those of thrombin's bona fide substrates.
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3
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Maxwell JW, Payne RJ. Revealing the functional roles of tyrosine sulfation using synthetic sulfopeptides and sulfoproteins. Curr Opin Chem Biol 2020; 58:72-85. [DOI: 10.1016/j.cbpa.2020.05.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/14/2020] [Accepted: 05/14/2020] [Indexed: 12/27/2022]
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4
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Capriotti AL, Cerrato A, Laganà A, Montone CM, Piovesana S, Zenezini Chiozzi R, Cavaliere C. Development of a Sample-Preparation Workflow for Sulfopeptide Enrichment: From Target Analysis to Challenges in Shotgun Sulfoproteomics. Anal Chem 2020; 92:7964-7971. [DOI: 10.1021/acs.analchem.0c01342] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Anna Laura Capriotti
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Andrea Cerrato
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Aldo Laganà
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
- CNR NANOTEC, Campus Ecotekne, University of Salento, Via Monteroni, 73100 Lecce, Italy
| | - Carmela Maria Montone
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Susy Piovesana
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Riccardo Zenezini Chiozzi
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, Utrecht 3584 CH, Netherlands
- Netherlands Proteomics CentrePadualaan 8Utrecht3584 CHNetherlands
| | - Chiara Cavaliere
- Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
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5
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Pieroni L, Iavarone F, Olianas A, Greco V, Desiderio C, Martelli C, Manconi B, Sanna MT, Messana I, Castagnola M, Cabras T. Enrichments of post-translational modifications in proteomic studies. J Sep Sci 2019; 43:313-336. [PMID: 31631532 DOI: 10.1002/jssc.201900804] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 09/23/2019] [Accepted: 10/17/2019] [Indexed: 12/14/2022]
Abstract
More than 300 different protein post-translational modifications are currently known, but only a few have been extensively investigated because modified proteoforms are commonly present in sub-stoichiometry amount. For this reason, improvement of specific enrichment techniques is particularly useful for the proteomic characterization of post-translationally modified proteins. Enrichment proteomic strategies could help the researcher in the challenging issue to decipher the complex molecular cross-talk existing between the different factors influencing the cellular pathways. In this review the state of art of the platforms applied for the enrichment of specific and most common post-translational modifications, such as glycosylation and glycation, phosphorylation, sulfation, redox modifications (i.e. sulfydration and nitrosylation), methylation, acetylation, and ubiquitinylation, are described. Enrichments strategies applied to characterize less studied post-translational modifications are also briefly discussed.
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Affiliation(s)
- Luisa Pieroni
- Laboratorio di Proteomica e Metabolomica, Centro Europeo di Ricerca sul Cervello, IRCCS Fondazione Santa Lucia, Rome, Italy
| | - Federica Iavarone
- Istituto di Biochimica e Biochimica Clinica, Facoltà di Medicina, Università Cattolica del Sacro Cuore, Rome, Italy.,IRCCS Fondazione Policlinico Universitario Agostino Gemelli, Rome, Italy
| | - Alessandra Olianas
- Dipartimento di Scienze della Vita e dell'Ambiente, Università di Cagliari, Cagliari, Italy
| | - Viviana Greco
- Istituto di Biochimica e Biochimica Clinica, Facoltà di Medicina, Università Cattolica del Sacro Cuore, Rome, Italy.,IRCCS Fondazione Policlinico Universitario Agostino Gemelli, Rome, Italy
| | - Claudia Desiderio
- Istituto di Chimica del Riconoscimento Molecolare, Consiglio Nazionale delle Ricerche, Rome, Italy
| | - Claudia Martelli
- Department of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich, Switzerland
| | - Barbara Manconi
- Dipartimento di Scienze della Vita e dell'Ambiente, Università di Cagliari, Cagliari, Italy
| | - Maria Teresa Sanna
- Dipartimento di Scienze della Vita e dell'Ambiente, Università di Cagliari, Cagliari, Italy
| | - Irene Messana
- Istituto di Chimica del Riconoscimento Molecolare, Consiglio Nazionale delle Ricerche, Rome, Italy
| | - Massimo Castagnola
- Laboratorio di Proteomica e Metabolomica, Centro Europeo di Ricerca sul Cervello, IRCCS Fondazione Santa Lucia, Rome, Italy
| | - Tiziana Cabras
- Dipartimento di Scienze della Vita e dell'Ambiente, Università di Cagliari, Cagliari, Italy
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6
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Hage C, Falvo F, Schäfer M, Sinz A. Novel Concepts of MS-Cleavable Cross-linkers for Improved Peptide Structure Analysis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:2022-2038. [PMID: 28653243 DOI: 10.1007/s13361-017-1712-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 05/03/2017] [Accepted: 05/07/2017] [Indexed: 06/07/2023]
Abstract
The chemical cross-linking/mass spectrometry (MS) approach is gaining increasing importance as an alternative method for studying protein conformation and for deciphering protein interaction networks. This study is part of our ongoing efforts to develop innovative cross-linking principles for a facile and efficient assignment of cross-linked products. We evaluate two homobifunctional, amine-reactive, and MS-cleavable cross-linkers regarding their potential for automated analysis of cross-linked products. We introduce the bromine phenylurea (BrPU) linker that possesses a unique structure yielding a distinctive fragmentation pattern on collisional activation. Moreover, BrPU delivers the characteristic bromine isotope pattern and mass defect for all cross-linker-decorated fragments. We compare the fragmentation behavior of the BrPU linker with that of our previously described MS-cleavable TEMPO-Bz linker (which consists of a 2,2,6,6-tetramethylpiperidine-1-oxy moiety connected to a benzyl group) that was developed to perform free-radical-initiated peptide sequencing. Comparative collisional activation experiments (collision-induced dissociation and higher-energy collision-induced dissociation) with both cross-linkers were conducted in negative electrospray ionization mode with an Orbitrap Fusion mass spectrometer using five model peptides. As hypothesized in a previous study, the presence of a cross-linked N-terminal aspartic acid residue seems to be the prerequisite for the loss of an intact peptide from the cross-linked products. As the BrPU linker combines a characteristic mass shift with an isotope signature, it presents a more favorable combination for automated assignment of cross-linked products compared with the TEMPO-Bz linker. ᅟ.
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Affiliation(s)
- Christoph Hage
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Francesco Falvo
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939, Cologne, Germany
- Eurofins Umwelt West GmbH, Vorgebirgsstr. 20, 50389, Wesseling, Germany
| | - Mathias Schäfer
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939, Cologne, Germany
| | - Andrea Sinz
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany.
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7
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Robinson MR, Brodbelt JS. Integrating Weak Anion Exchange and Ultraviolet Photodissociation Mass Spectrometry with Strategic Modulation of Peptide Basicity for the Enrichment of Sulfopeptides. Anal Chem 2016; 88:11037-11045. [PMID: 27768275 DOI: 10.1021/acs.analchem.6b02899] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Tyrosine sulfation is an important post-translational modification but remains difficult to detect in biological samples owing to its low stoichiometric abundance and the lack of effective enrichment methods. In the present study, weak anion exchange (WAX) is evaluated for the enrichment of sulfopeptides that have been modified via carbamylation to convert all primary amines to less basic carbamates. The decrease in basicity enhanced the binding of carbamylated sulfopeptides to WAX resin relative to nonsulfated peptides. Upon elution and electrospray ionization in the negative mode, ultraviolet photodissociation (UVPD) was applied for peptide sequencing. Application of the method to a tryptic digest of bovine coagulation factor V resulted in identification of sulfation on tyrosine 1513.
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Affiliation(s)
- Michelle R Robinson
- Department of Chemistry, The University of Texas , Austin, Texas 78712, United States
| | - Jennifer S Brodbelt
- Department of Chemistry, The University of Texas , Austin, Texas 78712, United States
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8
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Chicooree N, Unwin RD, Griffiths JR. The application of targeted mass spectrometry-based strategies to the detection and localization of post-translational modifications. MASS SPECTROMETRY REVIEWS 2015; 34:595-626. [PMID: 24737647 DOI: 10.1002/mas.21421] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Accepted: 12/10/2013] [Indexed: 06/03/2023]
Abstract
This review describes some of the more interesting and imaginative ways in which mass spectrometry has been utilized to study a number of important post-translational modifications over the past two decades; from circa 1990 to 2013. A diverse range of modifications is covered, including citrullination, sulfation, hydroxylation and sumoylation. A summary of the biological role of each modification described, along with some brief mechanistic detail, is also included. Emphasis has been placed on strategies specifically aimed at detecting target modifications, as opposed to more serendipitous modification discovery approaches, which rely upon straightforward product ion scanning methods. The authors have intentionally excluded from this review both phosphorylation and glycosylation since these major modifications have been extensively reviewed elsewhere.
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Affiliation(s)
- Navin Chicooree
- CRUK Manchester Institute, University of Manchester, Wilmslow Road, Manchester, M20 4BX, UK
- School of Chemistry, University of Manchester, Brunswick Street, Manchester, M13 9SU, UK
| | - Richard D Unwin
- Centre for Advanced Discovery and Experimental Therapeutics (CADET), Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Sciences Centre, Manchester, M13 9WL, UK
- Institute of Human Development, Faculty of Medical and Human Sciences, University of Manchester, Manchester, UK
| | - John R Griffiths
- CRUK Manchester Institute, University of Manchester, Wilmslow Road, Manchester, M20 4BX, UK
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9
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Structure characterization of unexpected covalent O-sulfonation and ion-pairing on an extremely hydrophilic peptide with CE-MS and FT-ICR-MS. Anal Bioanal Chem 2015; 407:6637-55. [DOI: 10.1007/s00216-015-8826-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 05/22/2015] [Accepted: 06/03/2015] [Indexed: 01/05/2023]
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10
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Yang YS, Wang CC, Chen BH, Hou YH, Hung KS, Mao YC. Tyrosine sulfation as a protein post-translational modification. Molecules 2015; 20:2138-64. [PMID: 25635379 PMCID: PMC6272617 DOI: 10.3390/molecules20022138] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 01/06/2015] [Accepted: 01/14/2015] [Indexed: 12/17/2022] Open
Abstract
Integration of inorganic sulfate into biological molecules plays an important role in biological systems and is directly involved in the instigation of diseases. Protein tyrosine sulfation (PTS) is a common post-translational modification that was first reported in the literature fifty years ago. However, the significance of PTS under physiological conditions and its link to diseases have just begun to be appreciated in recent years. PTS is catalyzed by tyrosylprotein sulfotransferase (TPST) through transfer of an activated sulfate from 3'-phosphoadenosine-5'-phosphosulfate to tyrosine in a variety of proteins and peptides. Currently, only a small fraction of sulfated proteins is known and the understanding of the biological sulfation mechanisms is still in progress. In this review, we give an introductory and selective brief review of PTS and then summarize the basic biochemical information including the activity and the preparation of TPST, methods for the determination of PTS, and kinetics and reaction mechanism of TPST. This information is fundamental for the further exploration of the function of PTS that induces protein-protein interactions and the subsequent biochemical and physiological reactions.
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Affiliation(s)
- Yuh-Shyong Yang
- Department of Biological Science and Technology, National Chiao Tung University, 75 Po-Ai Street, Hsinchu 30068, Taiwan.
| | - Chen-Chu Wang
- Department of Biological Science and Technology, National Chiao Tung University, 75 Po-Ai Street, Hsinchu 30068, Taiwan.
| | - Bo-Han Chen
- Department of Biological Science and Technology, National Chiao Tung University, 75 Po-Ai Street, Hsinchu 30068, Taiwan.
| | - You-Hua Hou
- Department of Biological Science and Technology, National Chiao Tung University, 75 Po-Ai Street, Hsinchu 30068, Taiwan.
| | - Kuo-Sheng Hung
- Department of Neurosurgery, Center of Excellence for Clinical Trial and Research, Taipei Medical University-Wan Fang Medical Center, Taipei 11696, Taiwan.
| | - Yi-Chih Mao
- Department of Biological Science and Technology, National Chiao Tung University, 75 Po-Ai Street, Hsinchu 30068, Taiwan.
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11
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Robinson MR, Moore KL, Brodbelt JS. Direct identification of tyrosine sulfation by using ultraviolet photodissociation mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:1461-71. [PMID: 24845354 PMCID: PMC4108549 DOI: 10.1007/s13361-014-0910-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Revised: 03/30/2014] [Accepted: 04/05/2014] [Indexed: 05/25/2023]
Abstract
Sulfation is a common post-translational modification of tyrosine residues in eukaryotes; however, detection using traditional liquid chromatography-mass spectrometry (LC-MS) methods is challenging based on poor ionization efficiency in the positive ion mode and facile neutral loss upon collisional activation. In the present study, 193 nm ultraviolet photodissociation (UVPD) is applied to sulfopeptide anions to generate diagnostic sequence ions, which do not undergo appreciable neutral loss of sulfate even using higher energy photoirradiation parameters. At the same time, neutral loss of SO₃ is observed from the precursor and charge-reduced precursor ions, a spectral feature that is useful for differentiating tyrosine sulfation from the nominally isobaric tyrosine phosphorylation. LC-MS detection limits for UVPD analysis in the negative mode were determined to be around 100 fmol for three sulfated peptides, caerulein, cionin, and leu-enkephalin. The LC-UVPD-MS method was applied for analysis of bovine fibrinogen, and its key sulfated peptide was confidently identified.
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Affiliation(s)
- Michelle R Robinson
- Department of Chemistry, The University of Texas at Austin, 1 University Station A5300, Austin, TX, 78712, USA
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12
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Cantel S, Brunel L, Ohara K, Enjalbal C, Martinez J, Vasseur JJ, Smietana M. An innovative strategy for sulfopeptides analysis using MALDI-TOF MS reflectron positive ion mode. Proteomics 2012; 12:2247-57. [DOI: 10.1002/pmic.201100525] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sonia Cantel
- Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier 1 et 2; Montpellier France
| | - Luc Brunel
- Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier 1 et 2; Montpellier France
| | - Keiichiro Ohara
- Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier 1 et 2; Montpellier France
| | - Christine Enjalbal
- Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier 1 et 2; Montpellier France
| | - Jean Martinez
- Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier 1 et 2; Montpellier France
| | - Jean-Jacques Vasseur
- Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier 1 et 2; Montpellier France
| | - Michael Smietana
- Institut des Biomolécules Max Mousseron (IBMM) UMR 5247 CNRS-Université Montpellier 1 et 2; Montpellier France
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13
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Kim JS, Song JS, Kim Y, Park SB, Kim HJ. De novo analysis of protein N-terminal sequence utilizing MALDI signal enhancing derivatization with Br signature. Anal Bioanal Chem 2011; 402:1911-9. [PMID: 22200925 DOI: 10.1007/s00216-011-5642-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 11/29/2011] [Accepted: 12/06/2011] [Indexed: 11/24/2022]
Abstract
De novo analysis of protein N-terminal sequence is important for identification of N-terminal proteolytic processing such as N-terminal methionine or signal peptide removal, or for the genome annotation of uncharacterized proteins. We introduce a de novo sequencing method of protein N terminus utilizing matrix-assisted laser desorption/ionization (MALDI) signal enhancing picolinamidination with bromine isotopic tag incorporated to the N terminus. The doublet signature of bromine in the tandem mass (MS/MS) spectrum distinguished N-terminal ion series from C-terminal ion series, facilitating de novo N-terminal sequencing of protein. The dual advantage of MALDI signal enhancement by the basic picolinamidine and b-ion selection aided by Br signature is demonstrated using a variety of peptides. The N-terminal sequences of myoglobin and hemoglobin as model proteins were determined by incorporating the Br tag to the N terminus of the proteins and obtaining a series of b-ions with Br signature by MS/MS analysis after chymotryptic digestion of the tagged proteins. The N-terminal peptide was selected for MS/MS analysis from the chymotryptic digest based on the Br signature in the mass spectrum. Identification of phosphorylation site as well as N-terminal sequencing of a phosphopeptide was straightforward.
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Affiliation(s)
- Jong-Seo Kim
- Department of Chemistry, Seoul National University, Seoul 151-742, Republic of Korea.
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14
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Song J, Kim HJ. Matrix-assisted laser desorption/ionization mass spectrometry peptide sequencing utilizing selective N-terminal bromoacetylation. Anal Biochem 2011; 423:269-76. [PMID: 22178914 DOI: 10.1016/j.ab.2011.11.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Revised: 10/21/2011] [Accepted: 11/21/2011] [Indexed: 10/14/2022]
Abstract
In tandem mass spectrometric peptide sequencing, simplifying the mass spectrum is often desirable. The b-series ions were distinguished from the y-series ions in the MALDI TOF-TOF spectra by incorporating a bromine-tag to the N-terminal amino group through rapid and selective acetylation using bromoacetic anhydride without blocking the lysine and tyrosine residues. The 51:49 ratio of Br-79 and Br-81 isotopes facilitated identification of ions carrying the tag. With the Br-tag in the b-series ions, N-terminal sequencing of tryptic peptides from hemoglobin as well as model peptides was straightforward. When the b-ions were low in intensity, ions without the Br-tag were identified as y-ions and used for sequencing.
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Affiliation(s)
- Jinsu Song
- Department of Chemistry, Seoul National University, Seoul, Republic of Korea
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15
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Kim JS, Shin M, Song JS, An S, Kim HJ. C-terminal de novo sequencing of peptides using oxazolone-based derivatization with bromine signature. Anal Biochem 2011; 419:211-6. [DOI: 10.1016/j.ab.2011.08.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 07/14/2011] [Accepted: 08/06/2011] [Indexed: 10/17/2022]
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