1
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Gorshkov V, Kjeldsen F. Exploiting Charge State Distribution To Probe Intramolecular Interactions in Gas-Phase Phosphopeptides and Enhance Proteomics Analyses. Anal Chem 2024; 96:1167-1177. [PMID: 38183295 DOI: 10.1021/acs.analchem.3c04270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2024]
Abstract
Charging of analytes is a prerequisite for performing mass spectrometry analysis. In proteomics, electrospray ionization is the dominant technique for this process. Although the observation of differences in the peptide charge state distribution (CSD) is well-known among experimentalists, its analytical value remains underexplored. To investigate the utility of this dimension, we analyzed several public data sets, comprising over 250,000 peptide CSD profiles from the human proteome. We found that the dimensions of the CSD demonstrate high reproducibility across multiple laboratories, mass analyzers, and extensive time intervals. The general observation was that the CSD enabled effective partitioning of the peptide property space, resulting in enhanced discrimination between sequence and constitutional peptide isomers. Next, by evaluating the CSD values of phosphorylated peptides, we were able to differentiate between phosphopeptides that indicate the formation of intramolecular structures in the gas phase and those that do not. The reproducibility of the CSD values (mean cosine similarity above 0.97 for most of the experiments) qualified CSD data suitable to train a deep-learning model capable of accurately predicting CSD values (mean cosine similarity - 0.98). When we applied the CSD dimension to MS1- and MS2-based proteomics experiments, we consistently observed around a 5% increase in protein and peptide identification rate. Even though the CSD dimension is not as effective a discriminator as the widely used retention time dimension, it still holds the potential for application in direct infusion proteomics.
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Affiliation(s)
- Vladimir Gorshkov
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Frank Kjeldsen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
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2
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Abdulbagi M, Di B, Li B. Resolving D-Amino Acid Containing Peptides Using Ion Mobility-Mass Spectrometry: Challenges and Recent Developments. Crit Rev Anal Chem 2023:1-10. [PMID: 37975700 DOI: 10.1080/10408347.2023.2282510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
Peptides and proteins having D-amino acids in their sequences are now believed to be widespread among different living organisms. Their significance is attributed to the diverse functions of these molecules, such as having a certain pathological implication or enhancing biological activity. Indeed, some peptide molecules with D-amino acids in their structure have already found their way to clinical use such as the antibacterial gramicidin and the antidiabetic nateglinide. Ion mobility mass spectrometry (IM-MS) added an additional dimension of separation as it depends on ions mobility in the space, which is dependent on their shapes, and the shape depends on the orientation of atoms. Thus, D-amino acids containing peptides (DAACPs) will have different mobility and collision cross-section values than those with L-amino acids. Eventually, this will lead to baseline separation of the two peptides. Additionally, ion mobility can precisely locate the position of D-amino acids by analyzing the difference in the arrival times of the fragment ions. The importance of DAACPs, as well as the difficulties in discovering them, were addressed in this review. Similarly, we emphasized how recent developments in IM-MS have improved their detection and analysis. Consequently, the LC-IM-MS/MS platform appears to be promising in isomeric mixture analysis.
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Affiliation(s)
- Mohamed Abdulbagi
- Center Key Laboratory on Protein Chemistry and Structural Biology, China Pharmaceutical University, Nanjing, China
| | - Bin Di
- Center Key Laboratory on Protein Chemistry and Structural Biology, China Pharmaceutical University, Nanjing, China
- Key Laboratory of Drug Quality Control and Pharmacovigilance, China Pharmaceutical University, Nanjing, China
- Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, China
| | - Bo Li
- Center Key Laboratory on Protein Chemistry and Structural Biology, China Pharmaceutical University, Nanjing, China
- Key Laboratory of Drug Quality Control and Pharmacovigilance, China Pharmaceutical University, Nanjing, China
- Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, China
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3
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Will A, Oliinyk D, Bleiholder C, Meier F. Peptide collision cross sections of 22 post-translational modifications. Anal Bioanal Chem 2023; 415:6633-6645. [PMID: 37758903 PMCID: PMC10598134 DOI: 10.1007/s00216-023-04957-4] [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] [Received: 12/23/2022] [Revised: 07/13/2023] [Accepted: 08/23/2023] [Indexed: 09/29/2023]
Abstract
Recent advances have rekindled the interest in ion mobility as an additional dimension of separation in mass spectrometry (MS)-based proteomics. Ion mobility separates ions according to their size and shape in the gas phase. Here, we set out to investigate the effect of 22 different post-translational modifications (PTMs) on the collision cross section (CCS) of peptides. In total, we analyzed ~4300 pairs of matching modified and unmodified peptide ion species by trapped ion mobility spectrometry (TIMS). Linear alignment based on spike-in reference peptides resulted in highly reproducible CCS values with a median coefficient of variation of 0.26%. On a global level, we observed a redistribution in the m/z vs. ion mobility space for modified peptides upon changes in their charge state. Pairwise comparison between modified and unmodified peptides of the same charge state revealed median shifts in CCS between -1.4% (arginine citrullination) and +4.5% (O-GlcNAcylation). In general, increasing modified peptide masses were correlated with higher CCS values, in particular within homologous PTM series. However, investigating the ion populations in more detail, we found that the change in CCS can vary substantially for a given PTM and is partially correlated with the gas phase structure of its unmodified counterpart. In conclusion, our study shows PTM- and sequence-specific effects on the cross section of peptides, which could be further leveraged for proteome-wide PTM analysis.
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Affiliation(s)
- Andreas Will
- Functional Proteomics, Jena University Hospital, Am Klinikum 1, 07747, Jena, Germany
| | - Denys Oliinyk
- Functional Proteomics, Jena University Hospital, Am Klinikum 1, 07747, Jena, Germany
| | - Christian Bleiholder
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32304, USA
| | - Florian Meier
- Functional Proteomics, Jena University Hospital, Am Klinikum 1, 07747, Jena, Germany.
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4
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Daly LA, Clarke CJ, Po A, Oswald SO, Eyers CE. Considerations for defining +80 Da mass shifts in mass spectrometry-based proteomics: phosphorylation and beyond. Chem Commun (Camb) 2023; 59:11484-11499. [PMID: 37681662 PMCID: PMC10521633 DOI: 10.1039/d3cc02909c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 08/21/2023] [Indexed: 09/09/2023]
Abstract
Post-translational modifications (PTMs) are ubiquitous and key to regulating protein function. Understanding the dynamics of individual PTMs and their biological roles requires robust characterisation. Mass spectrometry (MS) is the method of choice for the identification and quantification of protein modifications. This article focusses on the MS-based analysis of those covalent modifications that induce a mass shift of +80 Da, notably phosphorylation and sulfation, given the challenges associated with their discrimination and pinpointing the sites of modification on a polypeptide chain. Phosphorylation in particular is highly abundant, dynamic and can occur on numerous residues to invoke specific functions, hence robust characterisation is crucial to understanding biological relevance. Showcasing our work in the context of other developments in the field, we highlight approaches for enrichment and site localisation of phosphorylated (canonical and non-canonical) and sulfated peptides, as well as modification analysis in the context of intact proteins (top down proteomics) to explore combinatorial roles. Finally, we discuss the application of native ion-mobility MS to explore the effect of these PTMs on protein structure and ligand binding.
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Affiliation(s)
- Leonard A Daly
- Centre for Proteome Research, Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK.
| | - Christopher J Clarke
- Centre for Proteome Research, Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK.
| | - Allen Po
- Centre for Proteome Research, Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK.
| | - Sally O Oswald
- Centre for Proteome Research, Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK.
| | - Claire E Eyers
- Centre for Proteome Research, Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK.
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5
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Chen M, Zhu P, Wan Q, Ruan X, Wu P, Hao Y, Zhang Z, Sun J, Nie W, Chen S. High-Coverage Four-Dimensional Data-Independent Acquisition Proteomics and Phosphoproteomics Enabled by Deep Learning-Driven Multidimensional Predictions. Anal Chem 2023; 95:7495-7502. [PMID: 37126374 DOI: 10.1021/acs.analchem.2c05414] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Four-dimensional (4D) data-independent acquisition (DIA)-based proteomics is a promising technology. However, its full performance is restricted by the time-consuming building and limited coverage of a project-specific experimental library. Herein, we developed a versatile multifunctional deep learning model Deep4D based on self-attention that could predict the collisional cross section, retention time, fragment ion intensity, and charge state with high accuracies for both the unmodified and phosphorylated peptides and thus established the complete workflows for high-coverage 4D DIA proteomics and phosphoproteomics based on multidimensional predictions. A 4D predicted library containing ∼2 million peptides was established that could realize experimental library-free DIA analysis, and 33% more proteins were identified than using an experimental library of single-shot measurement in the example of HeLa cells. These results show the great values of the convenient high-coverage 4D DIA proteomics methods.
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Affiliation(s)
- Moran Chen
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Pujia Zhu
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Qiongqiong Wan
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Xianqin Ruan
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Pengfei Wu
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Yanhong Hao
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Zhourui Zhang
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Jian Sun
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Wenjing Nie
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Suming Chen
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
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6
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Zhang ZC, Hales DA, Clemmer DE. Influence of N Terminus Amino Acid on Peptide Cleavage in Solution through Diketopiperazine Formation. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:1368-1376. [PMID: 35576623 PMCID: PMC10161955 DOI: 10.1021/jasms.2c00037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Diketopiperazine (DKP) formation is an important degradation pathway for peptides and proteins. It can occur during synthesis and storage in either solution or the solid state. The kinetics of peptide cleavage through DKP formation have been analyzed for the model peptides Xaa1-Pro2-Gly4-Lys7 [Xaa = Gln, Glu, Lys, Ser, Phe, Trp, Tyr, Cha (β-cyclohexylalanine), Aib (α-aminoisobutyric acid), Gly, and Val] at multiple elevated temperatures in ethanol with ion mobility spectrometry-mass spectrometry (IMS-MS). When Xaa is an amino acid with a charged or polar side chain, degradation is relatively fast. When Xaa is an amino acid with a nonpolar alkyl side chain, the peptide is relatively stable. For these peptides, a bulky group on the α carbon speeds up dissociation, but the kinetic effects vary in a complicated manner for bulky groups on the β or γ carbon. Peptides where Xaa has a nonpolar aromatic side chain show moderate dissociation rates. The stability of these peptides is a result of multiple factors. The reaction rate is enhanced by (1) the stabilization of the late transition state through the interaction of an aromatic ring with the nascent DKP ring or lowering the activation energy of nucleophilic attack intermediate state through polar or charged residues and (2) the preference of the cis proline bond favored by the aromatic N-terminus. The number of unseen intermediates and transition state thermodynamic values are derived for each peptide by modeling the kinetics data. Most of the transition states are entropically favored (ΔS⧧ ∼ -5 to +31 J·mol-1·K-1), and all are enthalpically disfavored (ΔH⧧ ∼ 93 to 109 kJ·mol-1). The Gibbs free energy of activation is similar for all of the peptides studied here (ΔG⧧ ∼ 90-99 kJ·mol-1).
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Affiliation(s)
- Zhi-Chao Zhang
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - David A Hales
- Department of Chemistry, Hendrix College, Conway, Arkansas 72032, United States
| | - David E Clemmer
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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7
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Srinivasan A, Sing JC, Gingras AC, Röst HL. Improving Phosphoproteomics Profiling Using Data-Independent Mass Spectrometry. J Proteome Res 2022; 21:1789-1799. [PMID: 35877786 DOI: 10.1021/acs.jproteome.2c00172] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mass spectrometry-based profiling of the phosphoproteome is a powerful method of identifying phosphorylation events at a systems level. Most phosphoproteomics studies have used data-dependent acquisition (DDA) mass spectrometry as their method of choice. In this Perspective, we review some recent studies benchmarking DDA and DIA methods for phosphoproteomics and discuss data analysis options for DIA phosphoproteomics. In order to evaluate the impact of data-dependent and data-independent acquisition (DIA) on identification and quantification, we analyze a previously published phosphopeptide-enriched data set consisting of 10 replicates acquired by DDA and DIA each. We find that though more unique identifications are made in DDA data, phosphopeptides are identified more consistently across replicates in DIA. We further discuss the challenges of identifying chromatographically coeluting phosphopeptide isomers and investigate the impact on reproducibility of identifying high-confidence site-localized phosphopeptides in replicates.
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Affiliation(s)
- Aparna Srinivasan
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario M5G 1X5, Canada.,Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario M5S 3E1, Canada
| | - Justin C Sing
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario M5S 3E1, Canada
| | - Anne-Claude Gingras
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario M5G 1X5, Canada
| | - Hannes L Röst
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario M5S 3E1, Canada
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8
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Meier F, Park MA, Mann M. Trapped Ion Mobility Spectrometry and Parallel Accumulation-Serial Fragmentation in Proteomics. Mol Cell Proteomics 2021; 20:100138. [PMID: 34416385 PMCID: PMC8453224 DOI: 10.1016/j.mcpro.2021.100138] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 08/05/2021] [Accepted: 08/11/2021] [Indexed: 12/14/2022] Open
Abstract
Recent advances in efficiency and ease of implementation have rekindled interest in ion mobility spectrometry, a technique that separates gas phase ions by their size and shape and that can be hybridized with conventional LC and MS. Here, we review the recent development of trapped ion mobility spectrometry (TIMS) coupled to TOF mass analysis. In particular, the parallel accumulation-serial fragmentation (PASEF) operation mode offers unique advantages in terms of sequencing speed and sensitivity. Its defining feature is that it synchronizes the release of ions from the TIMS device with the downstream selection of precursors for fragmentation in a TIMS quadrupole TOF configuration. As ions are compressed into narrow ion mobility peaks, the number of peptide fragment ion spectra obtained in data-dependent or targeted analyses can be increased by an order of magnitude without compromising sensitivity. Taking advantage of the correlation between ion mobility and mass, the PASEF principle also multiplies the efficiency of data-independent acquisition. This makes the technology well suited for rapid proteome profiling, an increasingly important attribute in clinical proteomics, as well as for ultrasensitive measurements down to single cells. The speed and accuracy of TIMS and PASEF also enable precise measurements of collisional cross section values at the scale of more than a million data points and the development of neural networks capable of predicting them based only on peptide sequences. Peptide collisional cross section values can differ for isobaric sequences or positional isomers of post-translational modifications. This additional information may be leveraged in real time to direct data acquisition or in postprocessing to increase confidence in peptide identifications. These developments make TIMS quadrupole TOF PASEF a powerful and expandable platform for proteomics and beyond.
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Affiliation(s)
- Florian Meier
- Department Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany; Functional Proteomics, Jena University Hospital, Jena, Germany.
| | - Melvin A Park
- Bruker Daltonics Inc, Billerica, Massachusetts, USA.
| | - Matthias Mann
- Department Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany.
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9
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Zhang Z, Conant CR, El-Baba TJ, Raab SA, Fuller DR, Hales DA, Clemmer DE. Diketopiperazine Formation from FPG nK ( n = 1-9) Peptides: Rates of Structural Rearrangements and Mechanisms. J Phys Chem B 2021; 125:8107-8116. [PMID: 34270248 PMCID: PMC10661757 DOI: 10.1021/acs.jpcb.1c03515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Peptides with penultimate proline residues undergo trans → cis isomerization of the Phe1-Pro2 peptide bond followed by spontaneous bond cleavage at the Pro2-Xxx3 bond (where Xxx is another amino acid residue), leading to cleavage of the Pro2-Xxx3 bond and formation of a diketopiperazine (DKP). In this paper, ion mobility spectrometry and mass spectrometry techniques were used to study the dissociation kinetics of nine peptides [Phe1-Pro2-Glyn-Lysn+3 (n = 1-9)] in ethanol. Shorter (n = 1-3) peptides are found to be more stable than longer (n = 4-9) peptides. Alanine substitution studies indicate that, when experiments are initiated, the Phe1-Pro2 bond of the n = 9 peptide exists exclusively in the cis configuration, while the n = 1-8 peptides appear to exist initially with both cis- and trans-Phe1-Pro2 configured bonds. Molecular dynamics simulations indicate that intramolecular hydrogen bonding interactions stabilize conformations of shorter peptides, thus inhibiting DKP formation. Similar stabilizing interactions appear less frequently in longer peptides. In addition, in smaller peptides, the N-terminal amino group is more likely to be charged compared to the same group in longer peptides, which would inhibit the dissociation through the DKP formation mechanism. Analysis of temperature-dependent kinetics measurements provides insight about the mechanism of bond cleavage. The analysis gives the following transition state thermochemistry: ΔG⧧ values range from 94.6 ± 0.9 to 101.5 ± 1.9 kJ·mol-1, values of ΔH⧧ range from 89.1 ± 0.9 to 116.7 ± 1.5 kJ·mol-1, and ΔS⧧ values range from -25.4 ± 2.6 to 50.8 ± 4.2 J·mol-1·K-1. Proposed mechanisms and thermochemistry are discussed.
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Affiliation(s)
- Zhichao Zhang
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
| | - Christopher R Conant
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
| | - Tarick J El-Baba
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
| | - Shannon A Raab
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
| | - Daniel R Fuller
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
| | - David A Hales
- Department of Chemistry, Hendrix College, Conway, Arkansas, United States
| | - David E Clemmer
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
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10
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Deep learning the collisional cross sections of the peptide universe from a million experimental values. Nat Commun 2021; 12:1185. [PMID: 33608539 PMCID: PMC7896072 DOI: 10.1038/s41467-021-21352-8] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 01/22/2021] [Indexed: 01/09/2023] Open
Abstract
The size and shape of peptide ions in the gas phase are an under-explored dimension for mass spectrometry-based proteomics. To investigate the nature and utility of the peptide collisional cross section (CCS) space, we measure more than a million data points from whole-proteome digests of five organisms with trapped ion mobility spectrometry (TIMS) and parallel accumulation-serial fragmentation (PASEF). The scale and precision (CV < 1%) of our data is sufficient to train a deep recurrent neural network that accurately predicts CCS values solely based on the peptide sequence. Cross section predictions for the synthetic ProteomeTools peptides validate the model within a 1.4% median relative error (R > 0.99). Hydrophobicity, proportion of prolines and position of histidines are main determinants of the cross sections in addition to sequence-specific interactions. CCS values can now be predicted for any peptide and organism, forming a basis for advanced proteomics workflows that make full use of the additional information. Proteomics has been advanced by algorithms that can predict different peptide features, but predicting peptide collisional cross sections (CCS) has remained challenging. Here, the authors measure over one million CCS values of tryptic peptides and develop a deep learning model for peptide CCS prediction.
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11
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Ogata K, Chang CH, Ishihama Y. Effect of Phosphorylation on the Collision Cross Sections of Peptide Ions in Ion Mobility Spectrometry. Mass Spectrom (Tokyo) 2021; 10:A0093. [PMID: 33552826 PMCID: PMC7843839 DOI: 10.5702/massspectrometry.a0093] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 12/09/2020] [Indexed: 11/23/2022] Open
Abstract
The insertion of ion mobility spectrometry (IMS) between LC and MS can improve peptide identification in both proteomics and phosphoproteomics by providing structural information that is complementary to LC and MS, because IMS separates ions on the basis of differences in their shapes and charge states. However, it is necessary to know how phosphate groups affect the peptide collision cross sections (CCS) in order to accurately predict phosphopeptide CCS values and to maximize the usefulness of IMS. In this work, we systematically characterized the CCS values of 4,433 pairs of mono-phosphopeptide and corresponding unphosphorylated peptide ions using trapped ion mobility spectrometry (TIMS). Nearly one-third of the mono-phosphopeptide ions evaluated here showed smaller CCS values than their unphosphorylated counterparts, even though phosphorylation results in a mass increase of 80 Da. Significant changes of CCS upon phosphorylation occurred mainly in structurally extended peptides with large numbers of basic groups, possibly reflecting intramolecular interactions between phosphate and basic groups.
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Affiliation(s)
- Kosuke Ogata
- Department of Molecular and Cellular BioAnalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606–8501, Japan
| | - Chih-Hsiang Chang
- Department of Molecular and Cellular BioAnalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606–8501, Japan
| | - Yasushi Ishihama
- Department of Molecular and Cellular BioAnalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606–8501, Japan
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12
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Muehlbauer LK, Hebert AS, Westphall MS, Shishkova E, Coon JJ. Global Phosphoproteome Analysis Using High-Field Asymmetric Waveform Ion Mobility Spectrometry on a Hybrid Orbitrap Mass Spectrometer. Anal Chem 2020; 92:15959-15967. [PMID: 33270415 DOI: 10.1021/acs.analchem.0c03415] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mass spectrometry is the premier tool for identifying and quantifying protein phosphorylation on a global scale. Analysis of phosphopeptides requires enrichment, and even after the samples remain highly complex and exhibit broad dynamic range of abundance. Achieving maximal depth of coverage for phosphoproteomics therefore typically necessitates offline liquid chromatography prefractionation, a time-consuming and laborious approach. Here, we incorporate a recently commercialized aerodynamic high-field asymmetric waveform ion mobility spectrometry (FAIMS) device into the phosphoproteomic workflow. We characterize the effects of phosphorylation on the FAIMS separation, describe optimized compensation voltage settings for unlabeled phosphopeptides, and demonstrate the advantages of FAIMS-enabled gas-phase fractionation. Standard FAIMS single-shot analyses identified around 15-20% additional phosphorylation sites than control experiments without FAIMS. In comparison to liquid chromatography prefractionation, FAIMS experiments yielded similar or superior results when analyzing up to four discrete gas-phase fractions. Although using FAIMS led to a modest reduction in the precision of quantitative measurements when using label-free approaches, the data collected with FAIMS yielded a 26% increase in total reproducible measurements. Overall, we conclude that the new FAIMS technology is a valuable addition to any phosphoproteomic workflow, with greater benefits emerging from longer analyses and higher amounts of material.
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Affiliation(s)
- Laura K Muehlbauer
- National Center for Quantitative Biology of Complex Systems, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.,Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, 53706, United States
| | - Alexander S Hebert
- National Center for Quantitative Biology of Complex Systems, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.,Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, 53706, United States
| | - Michael S Westphall
- National Center for Quantitative Biology of Complex Systems, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.,Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, 53706, United States
| | - Evgenia Shishkova
- National Center for Quantitative Biology of Complex Systems, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.,Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, 53706, United States
| | - Joshua J Coon
- National Center for Quantitative Biology of Complex Systems, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.,Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, 53706, United States.,Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, 53706, United States.,Morgridge Institute for Research, Madison, Wisconsin 53706, United States
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13
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Meier F, Brunner AD, Frank M, Ha A, Bludau I, Voytik E, Kaspar-Schoenefeld S, Lubeck M, Raether O, Bache N, Aebersold R, Collins BC, Röst HL, Mann M. diaPASEF: parallel accumulation–serial fragmentation combined with data-independent acquisition. Nat Methods 2020; 17:1229-1236. [DOI: 10.1038/s41592-020-00998-0] [Citation(s) in RCA: 139] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 10/15/2020] [Indexed: 01/30/2023]
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14
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Li G, Delafield DG, Li L. Improved structural elucidation of peptide isomers and their receptors using advanced ion mobility-mass spectrometry. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2019.05.048] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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15
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Baird MA, Shliaha PV, Anderson GA, Moskovets E, Laiko V, Makarov AA, Jensen ON, Shvartsburg AA. High-Resolution Differential Ion Mobility Separations/Orbitrap Mass Spectrometry without Buffer Gas Limitations. Anal Chem 2019; 91:6918-6925. [DOI: 10.1021/acs.analchem.9b01309] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew A. Baird
- Department of Chemistry, Wichita State University, 1845 Fairmount, Wichita, Kansas 67260, United States
| | - Pavel V. Shliaha
- Department of Biochemistry and Molecular Biology, VILLUM Center for Bioanalytical Sciences, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Gordon A. Anderson
- GAACE, 101904 Wiser Parkway Suite 105, Kennewick, Washington 99338, United States
| | - Eugene Moskovets
- MassTech Inc., 6992 Columbia Gateway Drive, Columbia, Maryland 21046, United States
| | - Victor Laiko
- MassTech Inc., 6992 Columbia Gateway Drive, Columbia, Maryland 21046, United States
| | - Alexander A. Makarov
- Thermo Fisher Scientific, Hanna-Kunath Strasse 11, Bremen 28199, Germany
- Department of Chemistry, University of Utrecht, 3508 TC Utrecht, Netherlands
| | - Ole N. Jensen
- Department of Biochemistry and Molecular Biology, VILLUM Center for Bioanalytical Sciences, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Alexandre A. Shvartsburg
- Department of Chemistry, Wichita State University, 1845 Fairmount, Wichita, Kansas 67260, United States
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16
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Davis AL, Reinecke T, Morrison KA, Clowers BH. Optimized Reconstruction Techniques for Multiplexed Dual-Gate Ion Mobility Mass Spectrometry Experiments. Anal Chem 2019; 91:1432-1440. [PMID: 30561982 DOI: 10.1021/acs.analchem.8b04175] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
When coupling drift-tube gas-phase ion mobility separations with ion trapping mass analyzers an integrative, stepped approach to spectral reconstruction is a logical, yet highly inefficient means to determine gas-phase mobility coefficients. This experimental mode is largely predicated on the respective time scales of the two techniques each requiring tens of milliseconds to complete under routine conditions. Multiplexing techniques, such as Fourier and Hadamard based techniques, are a potential solution but still require extended experimental times that are not fully compatible with modern front-end separation schemes. Using a basis pursuit denoising (BPDN) approach to deconvolute Fourier transform ion mobility mass spectrometry (FT-IMMS) drift time spectra, we demonstrate significant time savings while maintaining a high degree of spectral resolution and signal-to-noise ratio. Under ideal conditions, the FT-IMMS operates with increased ion transmission (up to 25%); however, the linear chirp that spans into the kHz range often leads to significant levels of ion gate depletion, which limit both resolving power and ion transmission. The method proposed in this manuscript demonstrates the potential to reduce IMS acquisition time while simultaneously maximizing spectral resolution at longer effective gate pulse widths compared to the traditional set of multiplexing and signal averaging experiments.
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Affiliation(s)
- Austen L Davis
- Department of Chemistry , Washington State University , Pullman , Washington 99164 , United States
| | - Tobias Reinecke
- Department of Chemistry , Washington State University , Pullman , Washington 99164 , United States
| | - Kelsey A Morrison
- Department of Chemistry , Washington State University , Pullman , Washington 99164 , United States
| | - Brian H Clowers
- Department of Chemistry , Washington State University , Pullman , Washington 99164 , United States
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17
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Stoichiometry of Heavy Metal Binding to Peptides Involved in Alzheimer’s Disease: Mass Spectrometric Evidence. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1140:401-415. [DOI: 10.1007/978-3-030-15950-4_23] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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18
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Nshanian M, Lantz C, Wongkongkathep P, Schrader T, Klärner FG, Blümke A, Despres C, Ehrmann M, Smet-Nocca C, Bitan G, Loo JA. Native Top-Down Mass Spectrometry and Ion Mobility Spectrometry of the Interaction of Tau Protein with a Molecular Tweezer Assembly Modulator. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:16-23. [PMID: 30062477 PMCID: PMC6320309 DOI: 10.1007/s13361-018-2027-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Revised: 07/03/2018] [Accepted: 07/03/2018] [Indexed: 05/19/2023]
Abstract
Native top-down mass spectrometry (MS) and ion mobility spectrometry (IMS) were applied to characterize the interaction of a molecular tweezer assembly modulator, CLR01, with tau, a protein believed to be involved in a number of neurodegenerative disorders, including Alzheimer's disease. The tweezer CLR01 has been shown to inhibit aggregation of amyloidogenic polypeptides without toxic side effects. ESI-MS spectra for different forms of tau protein (full-length, fragments, phosphorylated, etc.) in the presence of CLR01 indicate a primary binding stoichiometry of 1:1. The relatively high charging of the protein measured from non-denaturing solutions is typical of intrinsically disordered proteins, such as tau. Top-down mass spectrometry using electron capture dissociation (ECD) is a tool used to determine not only the sites of post-translational modifications but also the binding site(s) of non-covalent interacting ligands to biomolecules. The intact protein and the protein-modulator complex were subjected to ECD-MS to obtain sequence information, map phosphorylation sites, and pinpoint the sites of inhibitor binding. The ESI-MS study of intact tau proteins indicates that top-down MS is amenable to the study of various tau isoforms and their post-translational modifications (PTMs). The ECD-MS data point to a CLR01 binding site in the microtubule-binding region of tau, spanning residues K294-K331, which includes a six-residue nucleating segment PHF6 (VQIVYK) implicated in aggregation. Furthermore, ion mobility experiments on the tau fragment in the presence of CLR01 and phosphorylated tau reveal a shift towards a more compact structure. The mass spectrometry study suggests a picture for the molecular mechanism of the modulation of protein-protein interactions in tau by CLR01. Graphical Abstract ᅟ.
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Affiliation(s)
- Michael Nshanian
- Department of Chemistry and Biochemistry, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Carter Lantz
- Department of Chemistry and Biochemistry, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Piriya Wongkongkathep
- Department of Chemistry and Biochemistry, University of California-Los Angeles, Los Angeles, CA, 90095, USA
- Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Thomas Schrader
- Institute of Chemistry, University of Duisburg-Essen, Essen, Germany
| | | | - Anika Blümke
- Center of Medical Biotechnology, Faculty of Biology, University of Duisburg-Essen, Universitaetsstrasse, Essen, Germany
| | - Clément Despres
- UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, Université Lille, CNRS, 59000, Lille, France
| | - Michael Ehrmann
- Center of Medical Biotechnology, Faculty of Biology, University of Duisburg-Essen, Universitaetsstrasse, Essen, Germany
| | - Caroline Smet-Nocca
- UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, Université Lille, CNRS, 59000, Lille, France
| | - Gal Bitan
- Department of Neurology and Brain Research Institute, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA, 90095, USA
- Molecular Biology Institute, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Joseph A Loo
- Department of Chemistry and Biochemistry, University of California-Los Angeles, Los Angeles, CA, 90095, USA.
- Molecular Biology Institute, University of California-Los Angeles, Los Angeles, CA, 90095, USA.
- Department of Biological Chemistry, University of California-Los Angeles, Los Angeles, CA, 90095, USA.
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19
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Garabedian A, Baird M, Porter J, Jeanne Dit Fouque K, Shliaha PV, Jensen ON, Williams TD, Fernandez-Lima F, Shvartsburg A. Linear and Differential Ion Mobility Separations of Middle-Down Proteoforms. Anal Chem 2018; 90:2918-2925. [PMID: 29359922 PMCID: PMC6366606 DOI: 10.1021/acs.analchem.7b05224] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Comprehensive characterization of proteomes comprising the same proteins with distinct post-translational modifications (PTMs) is a staggering challenge. Many such proteoforms are isomers (localization variants) that require separation followed by top-down or middle-down mass spectrometric analyses, but condensed-phase separations are ineffective in those size ranges. The variants for "middle-down" peptides were resolved by differential ion mobility spectrometry (FAIMS), relying on the mobility increment at high electric fields, but not previously by linear IMS on the basis of absolute mobility. We now use complete histone tails with diverse PTMs on alternative sites to demonstrate that high-resolution linear IMS, here trapped IMS (TIMS), broadly resolves the variants of ∼50 residues in full or into binary mixtures quantifiable by tandem MS, largely thanks to orthogonal separations across charge states. Separations using traveling-wave (TWIMS) and/or involving various time scales and electrospray ionization source conditions are similar (with lower resolution for TWIMS), showing the transferability of results across linear IMS instruments. The linear IMS and FAIMS dimensions are substantially orthogonal, suggesting FAIMS/IMS/MS as a powerful platform for proteoform analyses.
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Affiliation(s)
- Alyssa Garabedian
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199
| | - Matthew Baird
- Department of Chemistry, Wichita State University, 1845 Fairmount, Wichita, KS 67260
| | - Jacob Porter
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199
| | | | - Pavel V. Shliaha
- Department of Biochemistry and Molecular Biology, VILLUM Center for Bioanalytical Sciences, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Ole N. Jensen
- Department of Biochemistry and Molecular Biology, VILLUM Center for Bioanalytical Sciences, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Todd D. Williams
- Mass Spectrometry Laboratory, University of Kansas, Lawrence, KS 66045
| | | | - Alexandre Shvartsburg
- Department of Chemistry, Wichita State University, 1845 Fairmount, Wichita, KS 67260
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20
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D'Atri V, Causon T, Hernandez-Alba O, Mutabazi A, Veuthey JL, Cianferani S, Guillarme D. Adding a new separation dimension to MS and LC-MS: What is the utility of ion mobility spectrometry? J Sep Sci 2017; 41:20-67. [PMID: 29024509 DOI: 10.1002/jssc.201700919] [Citation(s) in RCA: 114] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 09/19/2017] [Accepted: 09/19/2017] [Indexed: 12/12/2022]
Abstract
Ion mobility spectrometry is an analytical technique known for more than 100 years, which entails separating ions in the gas phase based on their size, shape, and charge. While ion mobility spectrometry alone can be useful for some applications (mostly security analysis for detecting certain classes of narcotics and explosives), it becomes even more powerful in combination with mass spectrometry and high-performance liquid chromatography. Indeed, the limited resolving power of ion mobility spectrometry alone can be tackled when combining this analytical strategy with mass spectrometry or liquid chromatography with mass spectrometry. Over the last few years, the hyphenation of ion mobility spectrometry to mass spectrometry or liquid chromatography with mass spectrometry has attracted more and more interest, with significant progresses in both technical advances and pioneering applications. This review describes the theoretical background, available technologies, and future capabilities of these techniques. It also highlights a wide range of applications, from small molecules (natural products, metabolites, glycans, lipids) to large biomolecules (proteins, protein complexes, biopharmaceuticals, oligonucleotides).
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Affiliation(s)
- Valentina D'Atri
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Geneva, Switzerland
| | - Tim Causon
- Division of Analytical Chemistry, Department of Chemistry, University of Natural Resources and Life Sciences (BOKU Vienna), Vienna, Austria
| | - Oscar Hernandez-Alba
- BioOrganic Mass Spectrometry Laboratory (LSMBO), IPHC, Université de Strasbourg, CNRS, Strasbourg, France
| | - Aline Mutabazi
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Geneva, Switzerland
| | - Jean-Luc Veuthey
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Geneva, Switzerland
| | - Sarah Cianferani
- BioOrganic Mass Spectrometry Laboratory (LSMBO), IPHC, Université de Strasbourg, CNRS, Strasbourg, France
| | - Davy Guillarme
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Geneva, Switzerland
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21
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Shrivastav V, Nahin M, Hogan CJ, Larriba-Andaluz C. Benchmark Comparison for a Multi-Processing Ion Mobility Calculator in the Free Molecular Regime. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:1540-1551. [PMID: 28477243 DOI: 10.1007/s13361-017-1661-8] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 03/08/2017] [Accepted: 03/14/2017] [Indexed: 06/07/2023]
Abstract
A benchmark comparison between two ion mobility and collision cross-section (CCS) calculators, MOBCAL and IMoS, is presented here as a standard to test the efficiency and performance of both programs. Utilizing 47 organic ions, results are in excellent agreement between IMoS and MOBCAL in He and N2, when both programs use identical input parameters. Due to a more efficiently written algorithm and to its parallelization, IMoS is able to calculate the same CCS (within 1%) with a speed around two orders of magnitude faster than its MOBCAL counterpart when seven cores are used. Due to the high computational cost of MOBCAL in N2, reaching tens of thousands of seconds even for small ions, the comparison between IMoS and MOBCAL is stopped at 70 atoms. Large biomolecules (>10000 atoms) remain computationally expensive when IMoS is used in N2 (even when employing 16 cores). Approximations such as diffuse trajectory methods (DHSS, TDHSS) with and without partial charges and projected area approximation corrections can be used to reduce the total computational time by several folds without hurting the accuracy of the solution. These latter methods can in principle be used with coarse-grained model structures and should yield acceptable CCS results. Graphical Abstract ᅟ.
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Affiliation(s)
- Vaibhav Shrivastav
- Department of Mechanical Engineering, IUPUI, Indianapolis, IN, 46202, USA
| | - Minal Nahin
- Department of Mechanical Engineering, IUPUI, Indianapolis, IN, 46202, USA
| | - Christopher J Hogan
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, 55455, USA
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22
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Zhu S, Khatun R, Lento C, Sheng Y, Wilson DJ. Enhanced Binding Affinity via Destabilization of the Unbound State: A Millisecond Hydrogen–Deuterium Exchange Study of the Interaction between p53 and a Pleckstrin Homology Domain. Biochemistry 2017; 56:4127-4133. [DOI: 10.1021/acs.biochem.7b00193] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shaolong Zhu
- Department
of Chemistry, York University, Toronto, Ontario, Canada M3J 1P3
| | - Rahima Khatun
- Department
of Biology, York University, Toronto, Ontario, Canada M3J 1P3
| | - Cristina Lento
- Department
of Chemistry, York University, Toronto, Ontario, Canada M3J 1P3
| | - Yi Sheng
- Department
of Biology, York University, Toronto, Ontario, Canada M3J 1P3
| | - Derek J. Wilson
- Department
of Chemistry, York University, Toronto, Ontario, Canada M3J 1P3
- Centre
for Research in Mass Spectrometry, York University, Toronto, Ontario, Canada M3J 1P3
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23
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Kaszycki JL, Shvartsburg AA. A Priori Intrinsic PTM Size Parameters for Predicting the Ion Mobilities of Modified Peptides. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:294-302. [PMID: 27975328 DOI: 10.1007/s13361-016-1553-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 10/28/2016] [Accepted: 11/04/2016] [Indexed: 06/06/2023]
Abstract
The rising profile of ion mobility spectrometry (IMS) in proteomics has driven the efforts to predict peptide cross-sections. In the simplest approach, these are derived by adding the contributions of all amino acid residues and post-translational modifications (PTMs) defined by their intrinsic size parameters (ISPs). We show that the ISPs for PTMs can be calculated from properties of constituent atoms, and introduce the "impact scores" that govern the shift of cross-sections from the central mass-dependent trend for unmodified peptides. The ISPs and scores tabulated for 100 more common PTMs enable predicting the domains for modified peptides in the IMS/MS space that would guide subproteome investigations. Graphical Abstract ᅟ.
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Affiliation(s)
- Julia L Kaszycki
- Department of Chemistry, Wichita State University, 1845 Fairmount, Wichita, KS, 67260, USA
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24
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Baird MA, Shvartsburg AA. Localization of Post-Translational Modifications in Peptide Mixtures via High-Resolution Differential Ion Mobility Separations Followed by Electron Transfer Dissociation. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:2064-2070. [PMID: 27644938 PMCID: PMC7063994 DOI: 10.1007/s13361-016-1498-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/28/2016] [Accepted: 08/31/2016] [Indexed: 05/02/2023]
Abstract
Precise localization of post-translational modifications (PTMs) on proteins and peptides is an outstanding challenge in proteomics. While electron transfer dissociation (ETD) has dramatically advanced PTM analyses, mixtures of localization variants that commonly coexist in cells often require prior separation. Although differential or field asymmetric waveform ion mobility spectrometry (FAIMS) achieves broad variant resolution, the need for standards to identify the features has limited the utility of approach. Here we demonstrate full a priori characterization of variant mixtures by high-resolution FAIMS coupled to ETD and the procedures to systematically extract the FAIMS spectra for all variants from such data. Graphical Abstract ᅟ.
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Affiliation(s)
- Matthew A Baird
- Department of Chemistry, Wichita State University, 1845 Fairmount, Wichita, KS, 67260-0051, USA
| | - Alexandre A Shvartsburg
- Department of Chemistry, Wichita State University, 1845 Fairmount, Wichita, KS, 67260-0051, USA.
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