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Opening opportunities for K d determination and screening of MHC peptide complexes. Commun Biol 2022; 5:488. [PMID: 35606511 PMCID: PMC9127112 DOI: 10.1038/s42003-022-03366-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 04/13/2022] [Indexed: 01/15/2023] Open
Abstract
An essential element of adaptive immunity is selective binding of peptide antigens by major histocompatibility complex (MHC) class I proteins and their presentation to cytotoxic T lymphocytes. Using native mass spectrometry, we analyze the binding of peptides to an empty disulfide-stabilized HLA-A*02:01 molecule and, due to its unique stability, we determine binding affinities of complexes loaded with truncated or charge-reduced peptides. We find that the two anchor positions can be stabilized independently, and we further analyze the contribution of additional amino acid positions to the binding strength. As a complement to computational prediction tools, our method estimates binding strength of even low-affinity peptides to MHC class I complexes quickly and efficiently. It has huge potential to eliminate binding affinity biases and thus accelerate drug discovery in infectious diseases, autoimmunity, vaccine design, and cancer immunotherapy. The authors present a sensitive and rapid method to determine the binding strength of MHC class 1 peptide complexes using native mass spectrometry.
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2
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Analytical Strategies in Lipidomics for Discovery of Functional Biomarkers from Human Saliva. DISEASE MARKERS 2019; 2019:6741518. [PMID: 31885741 PMCID: PMC6914909 DOI: 10.1155/2019/6741518] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 10/29/2019] [Accepted: 11/13/2019] [Indexed: 01/24/2023]
Abstract
Human saliva is increasingly being used and validated as a biofluid for diagnosing, monitoring systemic disease status, and predicting disease progression. The discovery of biomarkers in saliva biofluid offers unique opportunities to bypass the invasive procedure of blood sampling by using oral fluids to evaluate the health condition of a patient. Saliva biofluid is clinically relevant since its components can be found in plasma. As salivary lipids are among the most essential cellular components of human saliva, there is great potential for their use as biomarkers. Lipid composition in cells and tissues change in response to physiological changes and normal tissues have a different lipid composition than tissues affected by diseases. Lipid imbalance is closely associated with a number of human lifestyle-related diseases, such as atherosclerosis, diabetes, metabolic syndromes, systemic cancers, neurodegenerative diseases, and infectious diseases. Thus, identification of lipidomic biomarkers or key lipids in different diseases can be used to diagnose diseases and disease state and evaluate response to treatments. However, further research is needed to determine if saliva can be used as a surrogate to serum lipid profiles, given that highly sensitive methods with low limits of detection are needed to discover salivary biomarkers in order to develop reliable diagnostic and disease monitoring salivary tests. Lipidomic methods have greatly advanced in recent years with a constant advance in mass spectrometry (MS) and development of MS detectors with high accuracy and high resolution that are able to determine the elemental composition of many lipids.
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Ma C, Chen M, Chu W, Tao J, Kong D, Zhang M, Feng W. A Practical and Total Synthesis of Pasireotide: Synthesis of Cyclic Hexapeptide via a Three-Component Condensation. Molecules 2019; 24:molecules24112185. [PMID: 31212595 PMCID: PMC6600510 DOI: 10.3390/molecules24112185] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 05/29/2019] [Accepted: 06/04/2019] [Indexed: 11/16/2022] Open
Abstract
Pasireotide is a multi-receptor ligand somatostatin analogue approved for medical treatment of Cushing’s disease and acromegaly. The liquid-phase total synthesis of pasireotide-a 18-membered cyclic hexapeptide-was achieved by the 3 + 2 + 1 strategy, and the Pro1-Phe6 peptide bond was selected as the final cyclization position. Two key fragments were simply synthesized using N,O-bis(trimethylsilyl)acetamide/N-hydroxysuccinimide ester (BSA/NHS) as coupling agents, and processes of the two key fragments were simple without any chromatographic purification. The current synthesis method is easily scalable and produces the target peptide with an overall yield of 15%.
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Affiliation(s)
- Chunying Ma
- Department of New Drug Research and Development, Institute of Materia Medical, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Miao Chen
- Department of New Drug Research and Development, Institute of Materia Medical, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Weiming Chu
- Department of New Drug Research and Development, Institute of Materia Medical, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Jiayi Tao
- Department of New Drug Research and Development, Institute of Materia Medical, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Delong Kong
- Department of New Drug Research and Development, Institute of Materia Medical, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Mengmeng Zhang
- Department of New Drug Research and Development, Institute of Materia Medical, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Wenhua Feng
- Department of New Drug Research and Development, Institute of Materia Medical, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
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4
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Spesyvyi A, Sovová K, Španěl P. In-tube collision-induced dissociation for selected ion flow-drift tube mass spectrometry, SIFDT-MS: a case study of NO(+) reactions with isomeric monoterpenes. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:2009-2016. [PMID: 27459885 DOI: 10.1002/rcm.7679] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 06/30/2016] [Accepted: 07/02/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE Soft chemical ionisation techniques including selected ion flow tube mass spectrometry, SIFT-MS, and proton transfer reaction mass spectrometry, PTR-MS, cannot currently quantify individual isomers present simultaneously in samples, a notable example being atmospheric monoterpenes. A possible solution lies in integrating in-tube collision-induced dissociation, CID, into a selected ion flow-drift tube mass spectrometry, SIFDT-MS, instrument. METHODS In-tube CID was implemented by applying electrostatic potential difference between the resistive glass flow-drift tube downstream end and the nose cone of a quadrupole mass spectrometer. The resulting inhomogeneous electric field accelerates the product ions along the last 1 mm before the nose cone and causes their dissociation in collisions with molecules of the buffer gas (4% air, 96% helium, 2 mbar). Mass spectra of the product ions of NO(+) reactions with 3-carene, β-pinene, (S)-limonene and their mixture were obtained for variable potential difference. RESULTS Potential difference up to 47.7 V resulted in dramatic changes in the mass spectra due to fragmentation of the monoterpene radical molecular cations. The main observed fragments correspond to logical losses from different isomeric structures. Fragmentation increases with the potential difference and can be interpreted as single collision dissociation on air molecules at centre-of-mass energies of several eV. Combination of fragmentation patterns at different CID enables distinction of isomers in the mixture on the basis of pseudoinversion. CONCLUSIONS In-tube CID represents a simple and low-cost extension to SIFDT-MS that allows real-time identification of isomeric products of ion-molecule reactions on the basis of their structural differences and corresponding changes in fragmentation patterns with CID energy without significantly changing the net reaction time important for absolute quantification. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Anatolii Spesyvyi
- J. Heyrovsky Institute of Physical Chemistry, The Czech Academy of Sciences, Dolejškova 3, 18223, Prague 8, Czech Republic
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 18000, Prague 8, Czech Republic
| | - Kristýna Sovová
- J. Heyrovsky Institute of Physical Chemistry, The Czech Academy of Sciences, Dolejškova 3, 18223, Prague 8, Czech Republic
| | - Patrik Španěl
- J. Heyrovsky Institute of Physical Chemistry, The Czech Academy of Sciences, Dolejškova 3, 18223, Prague 8, Czech Republic
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5
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Black DM, Bhattarai N, Whetten RL, Bach SBH. Collision-induced dissociation of monolayer protected clusters Au144 and Au130 in an electrospray time-of-flight mass spectrometer. J Phys Chem A 2014; 118:10679-87. [PMID: 25317476 DOI: 10.1021/jp508059j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Gas-phase reactions of larger gold clusters are poorly known because generation of the intact parent species for mass spectrometric analysis remains quite challenging. Herein we report in-source collision-induced dissociation (CID) results for the monolayer protected clusters (MPCs) Au144(SR)60 and Au130(SR)50, where R- = PhCH2CH2-, in a Bruker micrOTOF time-of-flight mass spectrometer. A sample mixture of the two clusters was introduced into the mass spectrometer by positive mode electrospray ionization. Standard source conditions were used to acquire a reference mass spectrum, exhibiting negligible fragmentation, and then the capillary-skimmer potential difference was increased to induce in-source CID within this low-pressure region (∼4 mbar). Remarkably, distinctive fragmentation patterns are observed for each MPC[3+] parent ion. An assignment of all the major dissociation products (ions and neutrals) is deduced and interpreted by using the distinguishing characteristics in the standard structure-models for the respective MPCs. Also, we propose a ring-forming elimination mechanism to explain R-H neutral loss, as separate from the channels leading to RS-SR or (AuSR)4 neutrals.
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Affiliation(s)
- David M Black
- Department of Chemistry, University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
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6
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Webb IK, Chen TC, Danielson WF, Ibrahim YM, Tang K, Anderson GA, Smith RD. Implementation of dipolar resonant excitation for collision induced dissociation with ion mobility/time-of-flight MS. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:563-71. [PMID: 24470195 PMCID: PMC4113219 DOI: 10.1007/s13361-013-0815-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 12/19/2013] [Accepted: 12/19/2013] [Indexed: 05/26/2023]
Abstract
An ion mobility/time-of-flight mass spectrometer (IMS/TOF MS) platform that allows for resonant excitation collision induced dissociation (CID) is presented. Highly efficient, mass-resolved fragmentation without additional excitation of product ions was accomplished and over-fragmentation common in beam-type CID experiments was alleviated. A quadrupole ion guide was modified to apply a dipolar AC signal across a pair of rods for resonant excitation. The method was characterized with singly protonated methionine enkephalin and triply protonated peptide angiotensin I, yielding maximum CID efficiencies of 44% and 84%, respectively. The Mathieu q(x,y) parameter was set at 0.707 for these experiments to maximize pseudopotential well depths and CID efficiencies. Resonant excitation CID was compared with beam-type CID for the peptide mixture. The ability to apply resonant waveforms in mobility-resolved windows is demonstrated with a peptide mixture yielding fragmentation over a range of mass-to-charge (m/z) ratios within a single IMS-MS analysis.
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7
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Wang Y, Balgley BM, Lee CS. Tissue proteomics using capillary isoelectric focusing-based multidimensional separations. Expert Rev Proteomics 2014; 2:659-67. [PMID: 16209646 DOI: 10.1586/14789450.2.5.659] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The capabilities of capillary isoelectric focusing-based multidimensional separations for performing proteome analysis from minute samples create new opportunities in the pursuit of biomarker discovery using enriched and selected cell populations procured from tissue specimens. In this article, recent advances in online integration of capillary isoelectric focusing with nano-reversed phase liquid chromatography for achieving high-resolution peptide and protein separations prior to mass spectrometry analysis are reviewed, along with its potential application to tissue proteomics. These proteome technological advances combined with recently developed tissue microdissection techniques, provide powerful tools for those seeking to gain a greater understanding at the global level of the cellular machinery associated with human diseases such as cancer.
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Affiliation(s)
- Yueju Wang
- Calibrant Biosystems, Gaithersburg, MD 20878, USA.
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8
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Huang X, Liu M, Nold MJ, Tian C, Fu K, Zheng J, Geromanos SJ, Ding SJ. Software for quantitative proteomic analysis using stable isotope labeling and data independent acquisition. Anal Chem 2011; 83:6971-9. [PMID: 21834580 DOI: 10.1021/ac201555m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Many software tools have been developed for analyzing stable isotope labeling (SIL)-based quantitative proteomic data using data dependent acquisition (DDA). However, programs for analyzing SIL-based quantitative proteomics data obtained with data independent acquisition (DIA) have yet to be reported. Here, we demonstrated the development of a new software for analyzing SIL data using the DIA method. Performance of the DIA on SYNAPT G2MS was evaluated using SIL-labeled complex proteome mixtures with known heavy/light ratios (H/L = 1:1, 1:5, and 1:10) and compared with the DDA on linear ion trap (LTQ)-Orbitrap MS. The DIA displays relatively high quantitation accuracy for peptides cross all intensity regions, while the DDA shows an intensity dependent distribution of H/L ratios. For the three proteome mixtures, the number of detected SIL-peptide pairs and dynamic range of protein intensities using DIA drop stepwise, whereas no significant changes in these aspects using DDA were observed. The new software was applied to investigate the proteome difference between mouse embryonic fibroblasts (MEFs) and MEF-derived induced pluripotent stem cells (iPSCs) using (16)O/(18)O labeling. Our study expanded the capacities of our UNiquant software pipeline and provided valuable insight into the performance of the two cutting-edge MS platforms for SIL-based quantitative proteomic analysis today.
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Affiliation(s)
- Xin Huang
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
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9
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Ning Z, Zhou H, Wang F, Abu-Farha M, Figeys D. Analytical Aspects of Proteomics: 2009–2010. Anal Chem 2011; 83:4407-26. [DOI: 10.1021/ac200857t] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
| | - Hu Zhou
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China 201203
| | - Fangjun Wang
- Key Lab of Separation Sciences for Analytical Chemistry, National Chromatographic Research and Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China 116023
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10
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Myung S, Cohen H, Fenyo D, Padovan JC, Krutchinsky AN, Chait BT. High-Capacity Ion Trap Coupled to a Time-of-Flight Mass Spectrometer for Comprehensive Linked Scans with no Scanning Losses. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY 2011; 301:211-219. [PMID: 21516228 PMCID: PMC3079222 DOI: 10.1016/j.ijms.2010.09.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A high-capacity ion trap coupled to a time-of-flight (TOF) mass spectrometer has been developed to carry out comprehensive linked scan analysis of all stored ions in the ion trap. The approach involves a novel tapered geometry high-capacity ion trap that can store more than 10(6) ions (range 800-4000 m/z) without degrading its performance. Ions are stored and scanned out from the high-capacity ion trap as a function of m/z, collisionally fragmented and analyzed by TOF. Accurate mass analysis is achieved on both the precursor and fragment ions of all species ejected from the ion trap. We demonstrate the approach for comprehensive linked-scan identification of phosphopeptides in mixtures with their corresponding unphosphorylated peptides.
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11
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Mbeunkui F, Scholl EH, Opperman CH, Goshe MB, Bird DM. Proteomic and Bioinformatic Analysis of the Root-Knot Nematode Meloidogyne hapla: The Basis for Plant Parasitism. J Proteome Res 2010; 9:5370-81. [DOI: 10.1021/pr1006069] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Flaubert Mbeunkui
- Department of Molecular and Structural Biochemistry and Plant Nematode Genomes Group, Department of Plant Pathology, NC State University, Raleigh, North Carolina 27695
| | - Elizabeth H. Scholl
- Department of Molecular and Structural Biochemistry and Plant Nematode Genomes Group, Department of Plant Pathology, NC State University, Raleigh, North Carolina 27695
| | - Charles H. Opperman
- Department of Molecular and Structural Biochemistry and Plant Nematode Genomes Group, Department of Plant Pathology, NC State University, Raleigh, North Carolina 27695
| | - Michael B. Goshe
- Department of Molecular and Structural Biochemistry and Plant Nematode Genomes Group, Department of Plant Pathology, NC State University, Raleigh, North Carolina 27695
| | - David McK. Bird
- Department of Molecular and Structural Biochemistry and Plant Nematode Genomes Group, Department of Plant Pathology, NC State University, Raleigh, North Carolina 27695
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12
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Geiger T, Cox J, Mann M. Proteomics on an Orbitrap benchtop mass spectrometer using all-ion fragmentation. Mol Cell Proteomics 2010; 9:2252-61. [PMID: 20610777 PMCID: PMC2953918 DOI: 10.1074/mcp.m110.001537] [Citation(s) in RCA: 182] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The orbitrap mass analyzer combines high sensitivity, high resolution, and high mass accuracy in a compact format. In proteomics applications, it is used in a hybrid configuration with a linear ion trap (LTQ-Orbitrap) where the linear trap quadrupole (LTQ) accumulates, isolates, and fragments peptide ions. Alternatively, isolated ions can be fragmented by higher energy collisional dissociation. A recently introduced stand-alone orbitrap analyzer (Exactive) also features a higher energy collisional dissociation cell but cannot isolate ions. Here we report that this instrument can efficiently characterize protein mixtures by alternating MS and “all-ion fragmentation” (AIF) MS/MS scans in a manner similar to that previously described for quadrupole time-of-flight instruments. We applied the peak recognition algorithms of the MaxQuant software at both the precursor and product ion levels. Assignment of fragment ions to co-eluting precursor ions was facilitated by high resolution (100,000 at m/z 200) and high mass accuracy. For efficient fragmentation of different mass precursors, we implemented a stepped collision energy procedure with cumulative MS readout. AIF on the Exactive identified 45 of 48 proteins in an equimolar protein standard mixture and all of them when using a small database. The technique also identified proteins with more than 100-fold abundance differences in a high dynamic range standard. When applied to protein identification in gel slices, AIF unambiguously characterized an immunoprecipitated protein that was barely visible by Coomassie staining and quantified it relative to contaminating proteins. AIF on a benchtop orbitrap instrument is therefore an attractive technology for a wide range of proteomics analyses.
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Affiliation(s)
- Tamar Geiger
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Am Klopferspitz 18, D-82152 Martinsried, Germany
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13
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Lou X, van Dongen JLJ, Meijer EW. Generation of CsI cluster ions for mass calibration in matrix-assisted laser desorption/ionization mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2010; 21:1223-1226. [PMID: 20435487 DOI: 10.1016/j.jasms.2010.02.029] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Revised: 01/23/2010] [Accepted: 02/20/2010] [Indexed: 05/29/2023]
Abstract
A simple method was developed for the generation of cesium iodide (CsI) cluster ions up to m/z over 20,000 in matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS). Calibration ions in both positive and negative ion modes can readily be generated from a single MALDI spot of CsI(3) with 2-[(2E)-3-(4-tert-butylphenyl)-2-methylprop-2-enylidene] malononitrile (DCTB) matrix. The major cluster ion series observed in the positive ion mode is [(CsI)(n)Cs](+), and in the negative ion mode is [(CsI)(n)I](-). In both cluster series, ions spread evenly every 259.81 units. The easy method described here for the production of CsI cluster ions should be useful for MALDI MS calibrations.
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Affiliation(s)
- Xianwen Lou
- Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands.
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14
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Blackburn K, Mbeunkui F, Mitra SK, Mentzel T, Goshe MB. Improving Protein and Proteome Coverage through Data-Independent Multiplexed Peptide Fragmentation. J Proteome Res 2010; 9:3621-37. [DOI: 10.1021/pr100144z] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Kevin Blackburn
- Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695-7622, Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695-7609, and Institute of Botany, University of Basel, Hebelstrasse 1, CH-4056, Basel, Switzerland
| | - Flaubert Mbeunkui
- Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695-7622, Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695-7609, and Institute of Botany, University of Basel, Hebelstrasse 1, CH-4056, Basel, Switzerland
| | - Srijeet K. Mitra
- Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695-7622, Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695-7609, and Institute of Botany, University of Basel, Hebelstrasse 1, CH-4056, Basel, Switzerland
| | - Tobias Mentzel
- Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695-7622, Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695-7609, and Institute of Botany, University of Basel, Hebelstrasse 1, CH-4056, Basel, Switzerland
| | - Michael B. Goshe
- Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695-7622, Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695-7609, and Institute of Botany, University of Basel, Hebelstrasse 1, CH-4056, Basel, Switzerland
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15
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Arike L, Nahku R, Borrisova M, Adamberg K, Vilu R. Identification and relative quantification of proteins in Escherichia coli proteome by "up-front" collision-induced dissociation. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2010; 16:227-235. [PMID: 20212332 DOI: 10.1255/ejms.1068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A method for identifying and quantifying proteins with relatively low-cost orthogonal acceleration time-of- flight mass spectrometry (oa-ToF-MS) was tested. Escherichia coli (E. coli) K12 MG1655 cell lysate was separated by 1D gel-electrophoresis; fractions were digested and separated fast and reproducibly by ultra-performance liquid chromatography (UPLC). Peptides were identified using oa-ToF-MS to measure exact masses of parent ions and the fragment ions generated by up-front collision-induced dissociation. Fragmentation of all compounds was achieved by rapidly cycling between high- and low values of energy applied to ions. More than 100 proteins from E. coli K12 proteome were identified and relatively quantified. Results were found to correlate with transcriptome data determined by DNA microarrays.
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Affiliation(s)
- Liisa Arike
- Competence Centre of Food and Fermentation Technologies, 12618 Tallinn, Estonia.
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16
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Zhao L, Almaraz RT, Xiang F, Hedrick JL, Franz AH. Gas-phase scrambling of disulfide bonds during matrix-assisted laser desorption/ionization mass spectrometry analysis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2009; 20:1603-1616. [PMID: 19535267 DOI: 10.1016/j.jasms.2009.04.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 04/24/2009] [Accepted: 04/24/2009] [Indexed: 05/27/2023]
Abstract
Evidence for photo-induced radical disulfide bond scrambling in the gas phase during matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is described. The phenomenon was observed during the analysis of tryptic peptides from insulin and was confirmed in the determination of disulfide bonds in the rhamnose-binding lectin SEL24K from the Chinook salmon Oncorhynchus tshawytscha. A possible mechanism for this surprising scrambling is proposed. Despite this finding, the disulfide bond pattern in SEL24K was assigned unambiguously by a multi-enzyme digestion strategy in combination with MALDI mass spectrometry. The pattern was found to be symmetrical in the tandem repeat sequence of SEL24K. To the best of our knowledge, this is the first report of disulfide bond scrambling in the gas phase during MALDI-MS analysis. This observation has important ramifications for unambiguous assignment of disulfide bonds.
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Affiliation(s)
- Liang Zhao
- Department of Chemistry, University of the Pacific, Stockton, California 95211, USA
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17
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Xia YQ, Jemal M. High-Field Asymmetric Waveform Ion Mobility Spectrometry for Determining the Location of In-Source Collision-Induced Dissociation in Electrospray Ionization Mass Spectrometry. Anal Chem 2009; 81:7839-43. [DOI: 10.1021/ac9012336] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuan-Qing Xia
- Bioanalytical and Discovery Analytical Sciences, Research & Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
| | - Mohammed Jemal
- Bioanalytical and Discovery Analytical Sciences, Research & Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
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18
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Boyne MT, Garcia BA, Li M, Zamdborg L, Wenger CD, Babai S, Kelleher NL. Tandem mass spectrometry with ultrahigh mass accuracy clarifies peptide identification by database retrieval. J Proteome Res 2009; 8:374-9. [PMID: 19053528 DOI: 10.1021/pr800635m] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A platform was developed to analyze MS/MS spectra from large peptides with low part-per-million mass accuracy, including a commercial-grade software suite. Termed Middle Down Proteomics, this platform identified 7454 peptides from 2-20 kDa (1472 unique) from 555 proteins after 23 LC-MS/MS injections of Lys-C digests of HeLa-S3 nuclear proteins. Along with greatly increased confidence for both peptide identification (expectation values from 10(-89) to 10(-4)) and characterization (up to 18% of peptides were modified in some LC-MS/MS runs), fragmentation data with <2 ppm accuracy enabled error tolerant and routine multiplexed database searching-all clearly demonstrated in this study.
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Affiliation(s)
- Michael T Boyne
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA
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19
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Blackburn K, Goshe MB. Challenges and strategies for targeted phosphorylation site identification and quantification using mass spectrometry analysis. BRIEFINGS IN FUNCTIONAL GENOMICS AND PROTEOMICS 2008; 8:90-103. [DOI: 10.1093/bfgp/eln051] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Perry RH, Cooks RG, Noll RJ. Orbitrap mass spectrometry: instrumentation, ion motion and applications. MASS SPECTROMETRY REVIEWS 2008; 27:661-99. [PMID: 18683895 DOI: 10.1002/mas.20186] [Citation(s) in RCA: 273] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Since its introduction, the orbitrap has proven to be a robust mass analyzer that can routinely deliver high resolving power and mass accuracy. Unlike conventional ion traps such as the Paul and Penning traps, the orbitrap uses only electrostatic fields to confine and to analyze injected ion populations. In addition, its relatively low cost, simple design and high space-charge capacity make it suitable for tackling complex scientific problems in which high performance is required. This review begins with a brief account of the set of inventions that led to the orbitrap, followed by a qualitative description of ion capture, ion motion in the trap and modes of detection. Various orbitrap instruments, including the commercially available linear ion trap-orbitrap hybrid mass spectrometers, are also discussed with emphasis on the different methods used to inject ions into the trap. Figures of merit such as resolving power, mass accuracy, dynamic range and sensitivity of each type of instrument are compared. In addition, experimental techniques that allow mass-selective manipulation of the motion of confined ions and their potential application in tandem mass spectrometry in the orbitrap are described. Finally, some specific applications are reviewed to illustrate the performance and versatility of the orbitrap mass spectrometers.
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Affiliation(s)
- Richard H Perry
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
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21
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Jing L, Li C, Wong RL, Kaplan DA, Amster IJ. Improved mass accuracy for higher mass peptides by using SWIFT excitation for MALDI-FTICR mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2008; 19:76-81. [PMID: 18061475 PMCID: PMC2242857 DOI: 10.1016/j.jasms.2007.10.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2007] [Revised: 10/18/2007] [Accepted: 10/22/2007] [Indexed: 05/25/2023]
Abstract
Stepwise-external calibration has previously been shown to produce sub part-per-million (ppm) mass accuracy for the MALDI-FTICR/MS analyses of peptides up to m/z 2500. The present work extends these results to ions up to m/z 4000. Mass measurement errors for ions of higher mass-to-charge are larger than for ions below m/z 2500 when using conventional chirp excitation to detect ions. Mass accuracy obtained by using stored waveform inverse Fourier transform (SWIFT) excitation was evaluated and compared with chirp excitation. Analysis of measurement errors reveals that SWIFT excitation provides smaller deviations from the calibration equation and better mass accuracy than chirp excitation for a wide mass range and for widely varying ion populations.
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Affiliation(s)
- Li Jing
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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22
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Affiliation(s)
- Tao Liu
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
| | - Mikhail E. Belov
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
| | - Navdeep Jaitly
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
| | - Wei-Jun Qian
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
| | - Richard D. Smith
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
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23
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Ota S, Miyazaki S, Matsuoka H, Morisato K, Shintani Y, Nakanishi K. High-throughput protein digestion by trypsin-immobilized monolithic silica with pipette-tip formula. ACTA ACUST UNITED AC 2007; 70:57-62. [PMID: 17118458 DOI: 10.1016/j.jbbm.2006.10.005] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2006] [Revised: 08/31/2006] [Accepted: 10/10/2006] [Indexed: 11/23/2022]
Abstract
Based on the monolithic silica gel materials with hierarchical pore structure and on the SPE devices (MonoTip) developed thereof, a trypsin-immobilized monolithic silica in a pipette tip (MonoTip Trypsin) suitable for digesting proteins has been newly developed. The surface of monolithic silica fixed into the tip was chemically modified with trypsin via an aminopropyl group. Trypsin-immobilized monolith successfully performed a rapid digestion of reduced and alkylated proteins with only a few times pipetting operation for the pre-treatment procedure of chromatographic analysis. The novel solid-phase digestion tool using monolithic silica allows a high-throughput trypsin proteolysis of bio-substances in proteomics.
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Affiliation(s)
- Shigenori Ota
- GL Sciences Inc., 237-2 Sayamagahara, Iruma, Saitama, 358-0032, Japan.
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24
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Ye M, Liu SH, Jiang Z, Lee Y, Tilton R, Cheng YC. Liquid chromatography/mass spectrometry analysis of PHY906, a Chinese medicine formulation for cancer therapy. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:3593-3607. [PMID: 17944003 DOI: 10.1002/rcm.2832] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
PHY906 is a Chinese medicine formulation prepared from four medicinal herbs for adjuvant cancer chemotherapy. In this paper, liquid chromatography/electrospray ionization time-of-flight mass spectrometry (LC/ESI-TOFMS) was used to clarify the chemical composition of PHY906. The aqueous extract of PHY906 was separated on a Waters Atlantis C(18) column, and was eluted with acetonitrile/0.05% (v/v) formic acid. The separated compounds were identified with pure standards, or tentatively characterized by analyzing their mass spectra recorded in both negative and positive ion polarity modes. Further structural information was obtained from in-source fragmentation. Based on the LC/MS analysis, we proposed the structures for 64 bioactive compounds, including flavonoids, triterpene saponins, and monoterpene glycosides. All the compounds identified from PHY906 were further assigned in the four individual herbs, and some of them are reported for the first time.
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Affiliation(s)
- Min Ye
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA
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25
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Chakraborty AB, Berger SJ, Gebler JC. Use of an integrated MS--multiplexed MS/MS data acquisition strategy for high-coverage peptide mapping studies. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:730-44. [PMID: 17279597 DOI: 10.1002/rcm.2888] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Liquid chromatography/mass spectrometry (LC/MS) peptide maps have become a basic tool for characterizing proteins of biological and pharmaceutical interest. The ability to generate reproducible maps with high protein sequence coverage is a central goal of methods development. We have applied a recently developed analytical approach (termed LC/MS(E)) to LC/MS peptide mapping. Using the LC/MS(E) approach, the mass detector alternates between a low-energy scanning mode (MS) for accurate mass peptide precursor identification, and an elevated-energy mode (MS(E)) for generation of accurate mass multiplex peptide fragmentation data. In this paper, we evaluate this analytical approach against a tryptic digest of yeast enolase. From the low-energy data, high peptide map coverage (98% of sequence from peptides >3 amino acids) was reproducibly obtained. The MS signal for essentially equimolar peptides varied over 2 orders of magnitude in intensity, and peptide intensities could be precisely and reproducibly measured. Using the temporal constraint that MS(E) peptide fragment ions exhibit chromatographic profiles that parallel the precursor ions that generated them, we were able to produce accurate mass time-resolved MS/MS information for all enolase peptides with sufficient abundance to produce a detectable fragment ion.
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26
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Wang Y, Rudnick PA, Evans EL, Li J, Zhuang Z, Devoe DL, Lee CS, Balgley BM. Proteome analysis of microdissected tumor tissue using a capillary isoelectric focusing-based multidimensional separation platform coupled with ESI-tandem MS. Anal Chem 2006; 77:6549-56. [PMID: 16223239 DOI: 10.1021/ac050491b] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
This study demonstrates the ability to perform sensitive proteome analysis on the limited protein quantities available through tissue microdissection. Capillary isoelectric focusing combined with nano-reversed-phase liquid chromatography in an automated and integrated platform not only provides systematic resolution of complex peptide mixtures based on their differences in isoelectric point and hydrophobicity but also eliminates peptide loss and analyte dilution. In comparison with strong cation exchange chromatography, the significant advantages of electrokinetic focusing-based separations include high resolving power, high concentration and narrow analyte bands, and effective usage of electrospray ionization-tandem MS toward peptide identifications. Through the use of capillary isoelectric focusing-based multidimensional peptide separations, a total of 6866 fully tryptic peptides were detected, leading to the identification of 1820 distinct proteins. Each distinct protein was identified by at least one distinct peptide sequence. These high mass accuracy and high-confidence identifications were generated from three proteome runs of a single glioblastoma multiforme tissue sample, each run consuming only 10 microg of total protein, an amount corresponding to 20,000 selectively isolated cells. Instead of performing multiple runs of multidimensional separations, the overall peak capacity can be greatly enhanced for mining deeper into tissue proteomics by increasing the number of CIEF fractions without an accompanying increase in sample consumption.
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Affiliation(s)
- Yueju Wang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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27
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Calleri E, Temporini C, Perani E, De Palma A, Lubda D, Mellerio G, Sala A, Galliano M, Caccialanza G, Massolini G. Trypsin-based monolithic bioreactor coupled on-line with LC/MS/MS system for protein digestion and variant identification in standard solutions and serum samples. J Proteome Res 2005; 4:481-90. [PMID: 15822925 DOI: 10.1021/pr049796h] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The applicability of a trypsin-based monolithic bioreactor coupled on-line with LC/MS/MS for rapid proteolytic digestion and protein identification is here described. Dilute samples are passed through the bioreactor for generation of proteolytic fragments in less than 10 min. After digestion and peptide separation, electrospray ionization tandem mass spectrometry is used to generate a peptide map and to identify proteolytic peptides by correlating their fragmentation spectra with amino acid sequences from a protein database. By digesting picomoles of proteins sufficient data from ESI and MS/MS were obtained to unambiguously identify proteins alone and in serum samples. This approach was also extended to locate mutation sites in beta-lactoglobulin A and B variants.
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Affiliation(s)
- Enrica Calleri
- Department of Pharmaceutical Chemistry, University of Pavia, Via Taramelli 12, I-27100 Pavia, Italy.
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28
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Hu Q, Noll RJ, Li H, Makarov A, Hardman M, Graham Cooks R. The Orbitrap: a new mass spectrometer. JOURNAL OF MASS SPECTROMETRY : JMS 2005; 40:430-43. [PMID: 15838939 DOI: 10.1002/jms.856] [Citation(s) in RCA: 708] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Research areas such as proteomics and metabolomics are driving the demand for mass spectrometers that have high performance but modest power requirements, size, and cost. This paper describes such an instrument, the Orbitrap, based on a new type of mass analyzer invented by Makarov. The Orbitrap operates by radially trapping ions about a central spindle electrode. An outer barrel-like electrode is coaxial with the inner spindlelike electrode and mass/charge values are measured from the frequency of harmonic ion oscillations, along the axis of the electric field, undergone by the orbitally trapped ions. This axial frequency is independent of the energy and spatial spread of the ions. Ion frequencies are measured non-destructively by acquisition of time-domain image current transients, with subsequent fast Fourier transforms (FFTs) being used to obtain the mass spectra. In addition to describing the Orbitrap mass analyzer, this paper also describes a complete Orbitrap-based mass spectrometer, equipped with an electrospray ionization source (ESI). Ions are transferred from the ESI source through three stages of differential pumping using RF guide quadrupoles. The third quadrupole, pressurized to less than 10(-3) Torr with collision gas, acts as an ion accumulator; ion/neutral collisions slow the ions and cause them to pool in an axial potential well at the end of the quadrupole. Ion bunches are injected from this pool into the Orbitrap analyzer for mass analysis. The ion injection process is described in a simplified way, including a description of electrodynamic squeezing, field compensation for the effects of the ion injection slit, and criteria for orbital stability. Features of the Orbitrap at its present stage of development include high mass resolution (up to 150,000), large space charge capacity, high mass accuracy (2-5 ppm), a mass/charge range of at least 6000, and dynamic range greater than 10(3). Applications based on electrospray ionization are described, including characterization of transition-metal complexes, oligosaccharides, peptides, and proteins. Use is also made of the high-resolution capabilities of the Orbitrap to confirm the presence of metaclusters of serine octamers in ESI mass spectra and to perform H/D exchange experiments on these ions in the storage quadrupole.
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Affiliation(s)
- Qizhi Hu
- Purdue University, Chemistry Department, West Lafayette, IN 47907, USA
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29
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Massolini G, Calleri E. Immobilized trypsin systems coupled on-line to separation methods: Recent developments and analytical applications. J Sep Sci 2005; 28:7-21. [PMID: 15688626 DOI: 10.1002/jssc.200401941] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The ability to rapidly and efficiently digest and identify an unknown protein is of great utility for proteome studies. Identification of proteins via peptide mapping is generally accomplished through proteolytic digestion with enzymes such as trypsin. Limitations of this approach consist in manual sample manipulation steps and extended reaction times for proteolytic digestion. The use of immobilized trypsin for cleavage of proteins is advantageous in comparison with application of its soluble form. Enzymes can be immobilized on different supports and used in flow systems such as immobilized enzyme reactors (IMERs). This review reports applications of immobilized trypsin reactors in which the IMER has been integrated into separation systems such as reversed-phase liquid chromatography or capillary electrophoresis, prior to MS analysis. Immobilization procedures including supports, mode of integration into separation systems, and methods are described.
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Affiliation(s)
- Gabriella Massolini
- Department of Pharmaceutical Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy.
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30
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Newton RP, Brenton AG, Smith CJ, Dudley E. Plant proteome analysis by mass spectrometry: principles, problems, pitfalls and recent developments. PHYTOCHEMISTRY 2004; 65:1449-1485. [PMID: 15276445 DOI: 10.1016/j.phytochem.2004.04.015] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2004] [Revised: 04/06/2004] [Indexed: 05/24/2023]
Abstract
The genome of several species has now been elucidated; these genomes indicate the proteomic potential of the cell. While identification of genomes has been, and continues to be, a technically and intellectually demanding process, the identification of the proteome contains inherently greater difficulties. The proteome of each living cell is dynamic, altering in response to the individual cell's metabolic state and reception of intracellular and extracellular signal molecules, and many of the proteins which are expressed will be post-translationally altered. Thus if the purpose of the proteome analysis is to aid the understanding of protein function and interaction, then it is identification of the proteins in their final state which is required: for this mass spectrometric identification of individual proteins, indicating site and nature of modifications, is essential. Here we review the principles of the methodologies involved in such analyses, give some indication of current achievements in plant proteomics, and indicate imminent and prospective technical developments.
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Affiliation(s)
- Russell P Newton
- School of Biological Sciences, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK.
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