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Frey C, Arad M, Ku K, Hare R, Balagtas R, Shi Y, Moon KM, Foster LJ, Ghafourifar G. Development of automated proteomic workflows utilizing silicon-based coupling agents. J Proteomics 2024; 303:105215. [PMID: 38843981 DOI: 10.1016/j.jprot.2024.105215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 05/28/2024] [Accepted: 06/03/2024] [Indexed: 06/16/2024]
Abstract
Automated methods for enzyme immobilization via 4-triethoxysilylbutyraldehyde (TESB) derived silicone-based coupling agents were developed. TESB and its oxidized derivative, 4-triethoxysilylbutanoic acid (TESBA), were determined to be the most effective. The resulting immobilized enzyme particles (IEPs) displayed robustness, rapid digestion, and immobilization efficiency of 51 ± 8%. Furthermore, we automated the IEP procedure, allowing for multiple enzymes, and/or coupling agents to be fabricated at once, in a fraction of the time via an Agilent Bravo. The automated trypsin TESB and TESBA IEPs were shown to rival a classical in-gel digestion method. Moreover, pepsin IEPs favored cleavage at leucine (>50%) over aromatic and methionine residues. The IEP method was then adapted for an in-situ immobilized enzyme microreactor (IMER) fabrication. We determined that TESBA could functionalize the silica capillary's inner wall while simultaneously acting as an enzyme coupler. The IMER digestion of bovine serum albumin (BSA), mirroring IEP digestion conditions, yielded a 33-40% primary sequence coverage per LC-MS/MS analysis in as little as 15 min. Overall, our findings underscore the potential of both IEP and IMER methods, paving the way for automated analysis and a reduction in enzyme waste through reuse, thereby contributing to a more cost-effective and timely study of the proteome. SIGNIFICANCE: This research introduces 4-triethoxysilylbutyraldehyde (TESB) and its derivatives as silicon-based enzyme coupling agents and an automated liquid handling method for bottom-up proteomics (BUP) while streamlining sample preparation for high-throughput processing. Additionally, immobilized enzyme particle (IEP) fabrication and digestion within the 96-well plate allows for flexibility in protocol where different enzyme-coupler combinations can be employed simultaneously. By enabling the digestion of entire microplates and reducing manual labor, the proposed method enhances reproducibility and offers a more efficient alternative to classical in-gel techniques. Furthermore, pepsin IEPs were noted to favor cleavage at leucine residues which represents an interesting finding when compared to the literature that warrants further study. The capability of immobilized enzyme microreactors (IMER) for rapid digestion (in as little as 15 min) demonstrated the system's efficiency and potential for rapid proteomic analysis. This advancement in BUP not only improves efficiency, but also opens avenues for a fully automated, mass spectrometry-integrated proteomics workflow, promising to expedite research and discoveries in complex biological studies.
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Affiliation(s)
- Connor Frey
- Department of Chemistry, University of the Fraser Valley, 33844 King Road, Abbotsford, BC V2S 7M8, Canada; Faculty of Medicine, University of British Columbia, 2194 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada.
| | - Maor Arad
- Department of Chemistry, University of the Fraser Valley, 33844 King Road, Abbotsford, BC V2S 7M8, Canada; Department of Biochemistry and Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC V6T1Z4, Canada.
| | - Kenneth Ku
- Department of Chemistry, University of the Fraser Valley, 33844 King Road, Abbotsford, BC V2S 7M8, Canada
| | - Rhien Hare
- Department of Chemistry, University of the Fraser Valley, 33844 King Road, Abbotsford, BC V2S 7M8, Canada; Faculty of Health Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada.
| | - Ronald Balagtas
- Department of Chemistry, University of the Fraser Valley, 33844 King Road, Abbotsford, BC V2S 7M8, Canada.
| | - Yuming Shi
- Department of Biochemistry and Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC V6T1Z4, Canada.
| | - Kyung-Mee Moon
- Department of Biochemistry and Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC V6T1Z4, Canada.
| | - Leonard J Foster
- Department of Biochemistry and Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC V6T1Z4, Canada.
| | - Golfam Ghafourifar
- Department of Chemistry, University of the Fraser Valley, 33844 King Road, Abbotsford, BC V2S 7M8, Canada.
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Rincon Pabon JP, Akbar Z, Politis A. MSe Collision Energy Optimization for the Analysis of Membrane Proteins Using HDX-cIMS. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2024; 35:1383-1389. [PMID: 38842540 PMCID: PMC11228973 DOI: 10.1021/jasms.4c00093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 05/09/2024] [Accepted: 06/05/2024] [Indexed: 06/07/2024]
Abstract
Hydrogen/deuterium exchange mass spectrometry (HDX-MS) has evolved as an essential technique in structural proteomics. The use of ion mobility separation (IMS) coupled to HDX-MS has increased the applicability of the technique to more complex systems and has been shown to improve data quality and robustness. The first step when running any HDX-MS workflow is to confirm the sequence and retention time of the peptides resulting from the proteolytic digestion of the nondeuterated protein. Here, we optimized the collision energy ramp of HDMSE experiments for membrane proteins using a Waters SELECT SERIES cIMS-QTOF system following an HDX workflow using Phosphorylase B, XylE transporter, and Smoothened receptor (SMO) as model systems. Although collision energy (CE) ramp 10-50 eV gave the highest amount of positive identified peptides when using Phosphorylase B, XylE, and SMO, results suggest optimal CE ramps are protein specific, and different ramps can produce a unique set of peptides. We recommend cIMS users use different CE ramps in their HDMSE experiments and pool the results to ensure maximum peptide identifications. The results show how selecting an appropriate CE ramp can change the sequence coverage of proteins ranging from 4 to 94%.
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Affiliation(s)
- Juan Pablo Rincon Pabon
- Faculty of Biology, Medicine and Health, Division of Molecular and Cellular Function, The University of Manchester, Manchester M13 9PT, U.K
- Manchester Institute of Biotechnology, University of Manchester, Princess Street, Manchester M1 7DN, U.K
| | - Zulaikha Akbar
- Faculty of Biology, Medicine and Health, Division of Molecular and Cellular Function, The University of Manchester, Manchester M13 9PT, U.K
- Manchester Institute of Biotechnology, University of Manchester, Princess Street, Manchester M1 7DN, U.K
| | - Argyris Politis
- Faculty of Biology, Medicine and Health, Division of Molecular and Cellular Function, The University of Manchester, Manchester M13 9PT, U.K
- Manchester Institute of Biotechnology, University of Manchester, Princess Street, Manchester M1 7DN, U.K
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3
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Degliesposti G. Peptide-Based Mass Spectrometry for the Investigation of Protein Complexes. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2024; 3234:31-40. [PMID: 38507198 DOI: 10.1007/978-3-031-52193-5_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
In the last two decades, biological mass spectrometry has become the gold standard for the identification of proteins in biological samples. The technological advancement of mass spectrometers and the development of methods for ionization, gas phase transfer, peptide fragmentation as well as for acquisition of high-resolution mass spectrometric data marked the success of the technique. This chapter introduces peptide-based mass spectrometry as a tool for the investigation of protein complexes. It provides an overview of the main steps for sample preparation starting from protein fractionation, reduction, alkylation and focus on the final step of protein digestion. The basic concepts of biological mass spectrometry as well as details about instrumental analysis and data acquisition are described. Finally, the most common methods for data analysis and sequence determination are summarized with an emphasis on its application to protein-protein complexes.
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Ma CH, Chen CL, Hsu CC. Real-time bottom-up characterization of protein mixtures enabled by online microdroplet-assisted enzymatic digestion (MAED). Chem Commun (Camb) 2023; 59:12585-12588. [PMID: 37789821 DOI: 10.1039/d3cc03509c] [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: 10/05/2023]
Abstract
Enzymatic digestion remains one of the "rate-determining steps" in the bottom-up analysis of proteins. However, by performing digestion in microdroplets generated from electrosonic spray, the reaction could be accelerated to a timescale lower than milliseconds. Here, we describe a simple and rapid online digestion platform named online microdroplet-assisted enzymatic digestion (MAED). It involves the integration of intact protein separation with enzymatic digestion in microdroplets. Via online MAED, various protein standards, including an antibody standard, were characterized in a bottom-up manner without prior digestion, and high sequence coverages were obtained. We further extended the application of online MAED to a more complex sample, mouse brain extract, where protein identifications were successfully yielded. Compared with the conventional bottom-up approach, a more comprehensive characterization could be obtained particularly for low molecular weight proteins. In short, we provide a rapid and alternative bottom-up analysis in a top-down fashion as well as a new possibility for microdroplet chemistry.
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Affiliation(s)
- Cheng-Hua Ma
- Department of Chemistry, National Taiwan University, Taipei, 106216, Taiwan.
| | - Chih-Lin Chen
- Department of Chemistry, National Taiwan University, Taipei, 106216, Taiwan.
| | - Cheng-Chih Hsu
- Department of Chemistry, National Taiwan University, Taipei, 106216, Taiwan.
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5
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Ryan KA, Bruening ML. Online protein digestion in membranes between capillary electrophoresis and mass spectrometry. Analyst 2023; 148:1611-1619. [PMID: 36912593 DOI: 10.1039/d3an00106g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
Abstract
This research employs pepsin-containing membranes to digest proteins online after a capillary electrophoresis (CE) separation and prior to tandem mass spectrometry. Proteolysis after the separation allows the peptides from a given protein to enter the mass spectrometer in a single plug. Thus, migration time can serve as an additional criterion for confirming the identification of a peptide. The membrane resides in a sheath-flow electrospray ionization (ESI) source to enable digestion immediately before spray into the mass spectrometer, thus limiting separation of the digested peptides. Using the same membrane, digestion occurred reproducibly during 20 consecutive CE analyses performed over a 10 h period. Additionally, after separating a mixture of six unreduced proteins with CE, online digestion facilitated protein identification with at least 2 identifiable peptides for all the proteins. Sequence coverages were >75% for myoglobin and carbonic anhydrase II but much lower for proteins containing disulfide bonds. Development of methods for efficient separation of reduced proteins or identification of cross-linked peptides should enhance sequence coverages for proteins with disulfide bonds. Migration times for the peptides identified from a specific protein differed by <∼30 s, which allows for rejection of some spurious peptide identifications.
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Affiliation(s)
- Kendall A Ryan
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Merlin L Bruening
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA. .,Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
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Targeted Bottom-Up Mass Spectrometry Approach for the Relative Quantification of Post-Translational Modification of Bovine κ-Casein during Milk Fermentation. Molecules 2022; 27:molecules27185834. [PMID: 36144569 PMCID: PMC9506521 DOI: 10.3390/molecules27185834] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/02/2022] [Accepted: 09/05/2022] [Indexed: 11/16/2022] Open
Abstract
κ-casein (κ-CN) is one of the key components in bovine milk, playing a unique role in the structuration of casein micelles. It contains in its chemical structure up to sixteen amino acid residues (mainly serine and threonine) susceptible to modifications, including glycosylation and phosphorylation, which may further be formed during milk processing. In this study, changes in post-translational modification (PTM) of κ-CN during bovine milk fermentation were investigated. One-to-five-day fermented milk samples were produced. A traditional bottom−up proteomics approach was used to establish a multiple-reaction monitoring (MRM) method for relative quantification of κ-CN PTM. Endoproteinase Glu-C was found to efficiently digest the κ-CN molecule. The developed LC-MS method was validated by performing assessments of linearity, precision, repeatability, reproducibility, limit of detection (LOD), and limit of quantification (LOQ). Among the yielded peptides, four of them containing serine and threonine residues were identified and the unmodified as well as the modified variants of each of them were relatively quantified. These peptides were (1) IPTINTIASGEPTSTTE [140, 158], (2) STVATLE [162, 168], (3) DSPE [169, 172], and (4) INTVQVTSTAV [180, 190]. Distribution analysis between unmodified and modified peptides revealed that over 50% of κ-CN was found in one of its modified forms in milk. The fermentation process further significantly altered the composition between unmodified/modified κ-CN, with glycoslaytion being predominant compared to phosphorylation (p < 0.01). Further method development towards α and β-CN fractions and their PTM behavior would be an asset to better understand the changes undergone by milk proteins and the micellar structure during fermentation.
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James EI, Murphree TA, Vorauer C, Engen JR, Guttman M. Advances in Hydrogen/Deuterium Exchange Mass Spectrometry and the Pursuit of Challenging Biological Systems. Chem Rev 2021; 122:7562-7623. [PMID: 34493042 PMCID: PMC9053315 DOI: 10.1021/acs.chemrev.1c00279] [Citation(s) in RCA: 102] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
![]()
Solution-phase hydrogen/deuterium
exchange (HDX) coupled to mass
spectrometry (MS) is a widespread tool for structural analysis across
academia and the biopharmaceutical industry. By monitoring the exchangeability
of backbone amide protons, HDX-MS can reveal information about higher-order
structure and dynamics throughout a protein, can track protein folding
pathways, map interaction sites, and assess conformational states
of protein samples. The combination of the versatility of the hydrogen/deuterium
exchange reaction with the sensitivity of mass spectrometry has enabled
the study of extremely challenging protein systems, some of which
cannot be suitably studied using other techniques. Improvements over
the past three decades have continually increased throughput, robustness,
and expanded the limits of what is feasible for HDX-MS investigations.
To provide an overview for researchers seeking to utilize and derive
the most from HDX-MS for protein structural analysis, we summarize
the fundamental principles, basic methodology, strengths and weaknesses,
and the established applications of HDX-MS while highlighting new
developments and applications.
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Affiliation(s)
- Ellie I James
- Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Taylor A Murphree
- Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Clint Vorauer
- Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - John R Engen
- Department of Chemistry & Chemical Biology, Northeastern University, Boston, Massachusetts 02115, United States
| | - Miklos Guttman
- Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195, United States
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Samodova D, Hosfield CM, Cramer CN, Giuli MV, Cappellini E, Franciosa G, Rosenblatt MM, Kelstrup CD, Olsen JV. ProAlanase is an Effective Alternative to Trypsin for Proteomics Applications and Disulfide Bond Mapping. Mol Cell Proteomics 2020; 19:2139-2157. [PMID: 33020190 PMCID: PMC7710147 DOI: 10.1074/mcp.tir120.002129] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 09/29/2020] [Indexed: 01/01/2023] Open
Abstract
Trypsin is the protease of choice in bottom-up proteomics. However, its application can be limited by the amino acid composition of target proteins and the pH of the digestion solution. In this study we characterize ProAlanase, a protease from the fungus Aspergillus niger that cleaves primarily on the C-terminal side of proline and alanine residues. ProAlanase achieves high proteolytic activity and specificity when digestion is carried out at acidic pH (1.5) for relatively short (2 h) time periods. To elucidate the potential of ProAlanase in proteomics applications, we conducted a series of investigations comprising comparative multi-enzymatic profiling of a human cell line proteome, histone PTM analysis, ancient bone protein identification, phosphosite mapping and de novo sequencing of a proline-rich protein and disulfide bond mapping in mAb. The results demonstrate that ProAlanase is highly suitable for proteomics analysis of the arginine- and lysine-rich histones, enabling high sequence coverage of multiple histone family members. It also facilitates an efficient digestion of bone collagen thanks to the cleavage at the C terminus of hydroxyproline which is highly prevalent in collagen. This allows to identify complementary proteins in ProAlanase- and trypsin-digested ancient bone samples, as well as to increase sequence coverage of noncollagenous proteins. Moreover, digestion with ProAlanase improves protein sequence coverage and phosphosite localization for the proline-rich protein Notch3 intracellular domain (N3ICD). Furthermore, we achieve a nearly complete coverage of N3ICD protein by de novo sequencing using the combination of ProAlanase and tryptic peptides. Finally, we demonstrate that ProAlanase is efficient in disulfide bond mapping, showing high coverage of disulfide-containing regions in a nonreduced mAb.
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Affiliation(s)
- Diana Samodova
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark
| | | | | | - Maria V Giuli
- Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Enrico Cappellini
- Evolutionary Genomics SectionGlobe Institute, University of Copenhagen, Copenhagen, Denmark
| | - Giulia Franciosa
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark
| | | | - Christian D Kelstrup
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark
| | - Jesper V Olsen
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark.
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9
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Guo C, Steinberg LK, Henderson JP, Gross ML. Organic Solvents for Enhanced Proteolysis of Stable Proteins for Hydrogen-Deuterium Exchange Mass Spectrometry. Anal Chem 2020; 92:11553-11557. [PMID: 32867496 DOI: 10.1021/acs.analchem.0c02194] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Protein digestion is a key challenge in mass spectrometry (MS)-based structural proteomics. Although using hydrogen-deuterium exchange kinetics with MS (HDX-MS) to interrogate the high-order structure of proteins is now established, it can be challenging for β-barrel proteins, which are important in cellular transport. These proteins contain a continuous chain of H-bonds that impart stability, causing difficulty in digestion for bottom-up measurements. To overcome this impediment, we tested organic solvents as denaturants during on-line pepsin digestion of soluble β-barrel proteins. We selected green fluorescent protein (GFP), siderocalin (Scn), and retinol-binding protein 4 (RBP4) as model proteins and screened six different polar-aprotic and polar-protic solvent combinations to disrupt the H-bonds and hydrophobic interactions holding together the β-sheets. The use of organic solvents improves digestion, generating more peptides from the rigid β-barrel regions, without compromising the ability to predict the retinol binding site on RBP4 when adopting this proteolysis with HDX.
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Affiliation(s)
- Chunyang Guo
- Department of Chemistry, Washington University, St. Louis, Missouri 63130, United States
| | - Lindsey K Steinberg
- Division of Infectious Diseases, Department of Medicine, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, Missouri 63110, United States
| | - Jeffrey P Henderson
- Division of Infectious Diseases, Department of Medicine, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, Missouri 63110, United States
| | - Michael L Gross
- Department of Chemistry, Washington University, St. Louis, Missouri 63130, United States
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10
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Hudgens JW, Gallagher ES, Karageorgos I, Anderson KW, Filliben JJ, Huang RYC, Chen G, Bou-Assaf GM, Espada A, Chalmers MJ, Harguindey E, Zhang HM, Walters BT, Zhang J, Venable J, Steckler C, Park I, Brock A, Lu X, Pandey R, Chandramohan A, Anand GS, Nirudodhi SN, Sperry JB, Rouse JC, Carroll JA, Rand KD, Leurs U, Weis DD, Al-Naqshabandi MA, Hageman TS, Deredge D, Wintrode PL, Papanastasiou M, Lambris JD, Li S, Urata S. Interlaboratory Comparison of Hydrogen-Deuterium Exchange Mass Spectrometry Measurements of the Fab Fragment of NISTmAb. Anal Chem 2019; 91:7336-7345. [PMID: 31045344 PMCID: PMC6745711 DOI: 10.1021/acs.analchem.9b01100] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Hydrogen-deuterium exchange mass spectrometry (HDX-MS) is an established, powerful tool for investigating protein-ligand interactions, protein folding, and protein dynamics. However, HDX-MS is still an emergent tool for quality control of biopharmaceuticals and for establishing dynamic similarity between a biosimilar and an innovator therapeutic. Because industry will conduct quality control and similarity measurements over a product lifetime and in multiple locations, an understanding of HDX-MS reproducibility is critical. To determine the reproducibility of continuous-labeling, bottom-up HDX-MS measurements, the present interlaboratory comparison project evaluated deuterium uptake data from the Fab fragment of NISTmAb reference material (PDB: 5K8A ) from 15 laboratories. Laboratories reported ∼89 800 centroid measurements for 430 proteolytic peptide sequences of the Fab fragment (∼78 900 centroids), giving ∼100% coverage, and ∼10 900 centroid measurements for 77 peptide sequences of the Fc fragment. Nearly half of peptide sequences are unique to the reporting laboratory, and only two sequences are reported by all laboratories. The majority of the laboratories (87%) exhibited centroid mass laboratory repeatability precisions of ⟨ sLab⟩ ≤ (0.15 ± 0.01) Da (1σx̅). All laboratories achieved ⟨sLab⟩ ≤ 0.4 Da. For immersions of protein at THDX = (3.6 to 25) °C and for D2O exchange times of tHDX = (30 s to 4 h) the reproducibility of back-exchange corrected, deuterium uptake measurements for the 15 laboratories is σreproducibility15 Laboratories( tHDX) = (9.0 ± 0.9) % (1σ). A nine laboratory cohort that immersed samples at THDX = 25 °C exhibited reproducibility of σreproducibility25C cohort( tHDX) = (6.5 ± 0.6) % for back-exchange corrected, deuterium uptake measurements.
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Affiliation(s)
- Jeffrey W Hudgens
- Bioprocess Measurement Group, Biomolecular Measurements Division , National Institute of Standards and Technology , Rockville , Maryland 20850 , United States
- Institute for Bioscience and Biotechnology Research , 9600 Gudelsky Drive , Rockville , Maryland 20850 , United States
| | - Elyssia S Gallagher
- Bioprocess Measurement Group, Biomolecular Measurements Division , National Institute of Standards and Technology , Rockville , Maryland 20850 , United States
- Institute for Bioscience and Biotechnology Research , 9600 Gudelsky Drive , Rockville , Maryland 20850 , United States
| | - Ioannis Karageorgos
- Bioprocess Measurement Group, Biomolecular Measurements Division , National Institute of Standards and Technology , Rockville , Maryland 20850 , United States
- Institute for Bioscience and Biotechnology Research , 9600 Gudelsky Drive , Rockville , Maryland 20850 , United States
| | - Kyle W Anderson
- Bioprocess Measurement Group, Biomolecular Measurements Division , National Institute of Standards and Technology , Rockville , Maryland 20850 , United States
- Institute for Bioscience and Biotechnology Research , 9600 Gudelsky Drive , Rockville , Maryland 20850 , United States
| | - James J Filliben
- Statistical Engineering Division , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States
| | - Richard Y-C Huang
- Pharmaceutical Candidate Optimization, Research and Development , Bristol-Myers Squibb Company , Princeton , New Jersey 08540 , United States
| | - Guodong Chen
- Pharmaceutical Candidate Optimization, Research and Development , Bristol-Myers Squibb Company , Princeton , New Jersey 08540 , United States
| | - George M Bou-Assaf
- Analytical Development , Biogen Inc. , 225 Binney Street , Cambridge , Massachusetts 02142 , United States
| | - Alfonso Espada
- Centro de Investigación Lilly S.A. , 28108 Alcobendas , Spain
| | - Michael J Chalmers
- Lilly Research Laboratories , Eli Lilly and Company , Indianapolis , Indiana 46285 , United States
| | | | - Hui-Min Zhang
- Protein Analytical Chemistry , Genentech, Inc. , 1 DNA Way , South San Francisco , California 94080 , United States
| | - Benjamin T Walters
- Protein Analytical Chemistry , Genentech, Inc. , 1 DNA Way , South San Francisco , California 94080 , United States
| | - Jennifer Zhang
- Protein Analytical Chemistry , Genentech, Inc. , 1 DNA Way , South San Francisco , California 94080 , United States
| | - John Venable
- Genomics Institute of the Novartis Research Foundation , 10675 John Jay Hopkins Drive , San Diego , California 92121 , United States
| | - Caitlin Steckler
- Genomics Institute of the Novartis Research Foundation , 10675 John Jay Hopkins Drive , San Diego , California 92121 , United States
- Joint Center for Structural Genomics , La Jolla , California 92037 , United States
| | - Inhee Park
- Genomics Institute of the Novartis Research Foundation , 10675 John Jay Hopkins Drive , San Diego , California 92121 , United States
| | - Ansgar Brock
- Genomics Institute of the Novartis Research Foundation , 10675 John Jay Hopkins Drive , San Diego , California 92121 , United States
| | - Xiaojun Lu
- MedImmune LLC , One MedImmune Way , Gaithersburg , Maryland 20878 , United States
| | - Ratnesh Pandey
- MedImmune LLC , One MedImmune Way , Gaithersburg , Maryland 20878 , United States
| | - Arun Chandramohan
- Department of Biological Sciences , National University of Singapore , 14, Science Drive 4 , Singapore 117543
| | - Ganesh Srinivasan Anand
- Department of Biological Sciences , National University of Singapore , 14, Science Drive 4 , Singapore 117543
| | - Sasidhar N Nirudodhi
- Vaccine R&D , Pfizer Inc. , 401 N Middletown Rd , Pearl River, New York 10965 , United States
| | - Justin B Sperry
- Analytical R&D , Pfizer Inc. , 700 Chesterfield Parkway West , Chesterfield , Missouri 63017 , United States
| | - Jason C Rouse
- Analytical R&D , Pfizer Inc. , 1 Burtt Road , Andover , Massachusetts 01810 , United States
| | - James A Carroll
- Analytical R&D , Pfizer Inc. , 700 Chesterfield Parkway West , Chesterfield , Missouri 63017 , United States
| | - Kasper D Rand
- Department of Pharmacy , University of Copenhagen , Universitetsparken 2 , DK-2100 Copenhagen , Denmark
| | - Ulrike Leurs
- Department of Pharmacy , University of Copenhagen , Universitetsparken 2 , DK-2100 Copenhagen , Denmark
| | - David D Weis
- Department of Chemistry , University of Kansas , 1567 Irving Hill Road , Lawrence , Kansas 66045 , United States
| | - Mohammed A Al-Naqshabandi
- Department of Chemistry , University of Kansas , 1567 Irving Hill Road , Lawrence , Kansas 66045 , United States
- Department of General Science , Soran University , Kawa Street , Soran , Kurdistan Region, Iraq
| | - Tyler S Hageman
- Department of Chemistry , University of Kansas , 1567 Irving Hill Road , Lawrence , Kansas 66045 , United States
| | - Daniel Deredge
- Department of Pharmaceutical Sciences , University of Maryland, Baltimore, School of Pharmacy , 20 North Pine Street , Baltimore , Maryland 21201 , United States
| | - Patrick L Wintrode
- Department of Pharmaceutical Sciences , University of Maryland, Baltimore, School of Pharmacy , 20 North Pine Street , Baltimore , Maryland 21201 , United States
| | - Malvina Papanastasiou
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine, 402 Stellar-Chance Laboratories , University of Pennsylvania , 422 Curie Boulevard , Philadelphia , Pennsylvania 19104 , United States
| | - John D Lambris
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine, 402 Stellar-Chance Laboratories , University of Pennsylvania , 422 Curie Boulevard , Philadelphia , Pennsylvania 19104 , United States
| | - Sheng Li
- Department of Medicine , University of California, San Diego , 9500 Gilman Drive , La Jolla , California 92093 , United States
| | - Sarah Urata
- Department of Medicine , University of California, San Diego , 9500 Gilman Drive , La Jolla , California 92093 , United States
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11
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Ladner Y, Mas S, Coussot G, Montels J, Perrin C. In-line tryptic digestion of therapeutic molecules by capillary electrophoresis with temperature control. Talanta 2019; 193:146-151. [DOI: 10.1016/j.talanta.2018.09.090] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 09/20/2018] [Accepted: 09/24/2018] [Indexed: 12/26/2022]
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12
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Campos CDM, Gamage SST, Jackson JM, Witek MA, Park DS, Murphy MC, Godwin AK, Soper SA. Microfluidic-based solid phase extraction of cell free DNA. LAB ON A CHIP 2018; 18:3459-3470. [PMID: 30339164 PMCID: PMC6391159 DOI: 10.1039/c8lc00716k] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Cell-free DNA (cfDNA) is a liquid biopsy marker that can carry signatures (i.e., mutations) associated with certain pathological conditions. Therefore, the extraction of cfDNA from a variety of clinical samples can be an effective and minimally invasive source of markers for disease detection and subsequent management. In the oncological diseases, circulating tumor DNA (ctDNA), a cfDNA sub-class, can carry clinically actionable mutations and coupled with next generation sequencing or other mutation detection methods provide a venue for effective in vitro diagnostics. However, cfDNA mutational analyses require high quality inputs. This necessitates extraction platforms that provide high recovery over the entire ctDNA size range (50 → 150 bp) with minimal interferences (i.e., co-extraction of genomic DNA), and high reproducibility with a simple workflow. Herein, we present a novel microfluidic solid-phase extraction device (μSPE) consisting of a plastic chip that is activated with UV/O3 to generate surface-confined carboxylic acid functionalities for the μSPE of cfDNA. The μSPE uses an immobilization buffer (IB) consisting of polyethylene glycol and salts that induce cfDNA condensation onto the activated plastic microfluidic surface. The μSPE consists of an array of micropillars to increase extraction bed load (scalable to loads >700 ng of cfDNA) and can be produced at low-cost using replication-based techniques. The entire μSPE can be fabricated in a single molding step negating the need for adding additional extraction supports to the device simplifying production and keeping device and assay cost low. The μSPE allowed for recoveries >90% of model cfDNA fragments across a range of sizes (100-700 bp) and even the ability to extract efficiently short cfDNA fragments (50 bp, >70%). In addition, the composition of the IB allowed for reducing the interference of co-extracted genomic DNA. We demonstrated the clinical utility of the μSPE by quantifying the levels of cfDNA in healthy donors and patients with non-small-cell lung and colorectal cancers. μSPE extracted cfDNA from plasma samples was also subjected to a ligase detection reaction (LDR) for determining the presence of mutations in the KRAS gene for colorectal and non-small cell lung cancer patients.
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Affiliation(s)
- Camila D. M. Campos
- Department of Chemistry, University of Kansas, Lawrence, KS, USA.
- Center of Biomodular Multi-scale Systems for Precision Medicine, USA
| | - Sachindra S. T. Gamage
- Department of Chemistry, University of Kansas, Lawrence, KS, USA.
- Center of Biomodular Multi-scale Systems for Precision Medicine, USA
| | - Joshua M. Jackson
- Department of Chemistry, University of Kansas, Lawrence, KS, USA.
- Center of Biomodular Multi-scale Systems for Precision Medicine, USA
| | - Malgorzata A. Witek
- Department of Chemistry, University of Kansas, Lawrence, KS, USA.
- Center of Biomodular Multi-scale Systems for Precision Medicine, USA
- Department of Biomedical Engineering, The University of North Carolina, Chapel Hill, NC 27599, USA
| | - Daniel S. Park
- Center of Biomodular Multi-scale Systems for Precision Medicine, USA
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA, USA
| | - Michael C. Murphy
- Center of Biomodular Multi-scale Systems for Precision Medicine, USA
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA, USA
| | - Andrew K. Godwin
- University of Kansas Cancer Center, University of Kansas Medical Center, Kansas City, KS, USA
| | - Steven A. Soper
- Department of Chemistry, University of Kansas, Lawrence, KS, USA.
- Center of Biomodular Multi-scale Systems for Precision Medicine, USA
- University of Kansas Cancer Center, University of Kansas Medical Center, Kansas City, KS, USA
- BioEngineering Program, The University of Kansas, Lawrence, KS 66047, USA
- Department of Mechanical Engineering, The University of Kansas, Lawrence, KS 66047, USA
- Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
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13
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Yi L, Piehowski PD, Shi T, Smith RD, Qian WJ. Advances in microscale separations towards nanoproteomics applications. J Chromatogr A 2017; 1523:40-48. [PMID: 28765000 PMCID: PMC6042839 DOI: 10.1016/j.chroma.2017.07.055] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Revised: 07/14/2017] [Accepted: 07/17/2017] [Indexed: 01/22/2023]
Abstract
Microscale separation (e.g., liquid chromatography or capillary electrophoresis) coupled with mass spectrometry (MS) has become the primary tool for advanced proteomics, an indispensable technology for gaining understanding of complex biological processes. In recent decades significant advances have been achieved in MS-based proteomics. However, the current proteomics platforms still face an analytical challenge in overall sensitivity towards nanoproteomics applications for starting materials of less than 1μg total proteins (e.g., cellular heterogeneity in tissue pathologies). Herein, we review recent advances in microscale separation techniques and integrated sample processing strategies that improve the overall sensitivity and proteome coverage of the proteomics workflow, and their contributions towards nanoproteomics applications.
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Affiliation(s)
- Lian Yi
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, United States
| | - Paul D Piehowski
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, United States
| | - Tujin Shi
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, United States
| | - Richard D Smith
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, United States
| | - Wei-Jun Qian
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, United States.
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14
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Kar UK, Simonian M, Whitelegge JP. Integral membrane proteins: bottom-up, top-down and structural proteomics. Expert Rev Proteomics 2017; 14:715-723. [PMID: 28737967 DOI: 10.1080/14789450.2017.1359545] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
INTRODUCTION Integral membrane proteins and lipids constitute the bilayer membranes that surround cells and sub-cellular compartments, and modulate movements of molecules and information between them. Since membrane protein drug targets represent a disproportionately large segment of the proteome, technical developments need timely review. Areas covered: Publically available resources such as Pubmed were surveyed. Bottom-up proteomics analyses now allow efficient extraction and digestion such that membrane protein coverage is essentially complete, making up around one third of the proteome. However, this coverage relies upon hydrophilic loop regions while transmembrane domains are generally poorly covered in peptide-based strategies. Top-down mass spectrometry where the intact membrane protein is fragmented in the gas phase gives good coverage in transmembrane regions, and membrane fractions are yielding to high-throughput top-down proteomics. Exciting progress in native mass spectrometry of membrane protein complexes is providing insights into subunit stoichiometry and lipid binding, and cross-linking strategies are contributing critical in-vivo information. Expert commentary: It is clear from the literature that integral membrane proteins have yielded to advanced techniques in protein chemistry and mass spectrometry, with applications limited only by the imagination of investigators. Key advances toward translation to the clinic are emphasized.
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Affiliation(s)
- Upendra K Kar
- a Department of Pharmaceutical Sciences, College of Pharmacy , University of Arkansas for Medical Sciences , Little Rock , AR , USA
| | - Margaret Simonian
- b NPI-Semel Institute , University of California Los Angeles , Los Angeles , CA , USA
| | - Julian P Whitelegge
- b NPI-Semel Institute , University of California Los Angeles , Los Angeles , CA , USA
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15
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Jönsson A, Svejdal RR, Bøgelund N, Nguyen TTTN, Flindt H, Kutter JP, Rand KD, Lafleur JP. Thiol-ene Monolithic Pepsin Microreactor with a 3D-Printed Interface for Efficient UPLC-MS Peptide Mapping Analyses. Anal Chem 2017; 89:4573-4580. [PMID: 28322047 DOI: 10.1021/acs.analchem.6b05103] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
To improve the sample handling, and reduce cost and preparation time, of peptide mapping LC-MS workflows in protein analytical research, we here investigate the possibility of replacing conventional enzymatic digestion methods with a polymer microfluidic chip based enzyme reactor. Off-stoichiometric thiol-ene is utilized as both bulk material and as a monolithic stationary phase for immobilization of the proteolytic enzyme pepsin. The digestion efficiency of the, thiol-ene based, immobilized enzyme reactor (IMER) is compared to that of a conventional, agarose packed bed, pepsin IMER column commonly used in LC-MS based protein analyses. The chip IMER is found to rival the conventional column in terms of digestion efficiency at comparable residence time and, using a 3D-printed interface, be directly interfaceable with LC-MS.
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Affiliation(s)
- Alexander Jönsson
- Department of Pharmacy, Copenhagen University , Universitetsparken 2, Copenhagen E DK-2100, Denmark
| | - Rasmus R Svejdal
- Department of Pharmacy, Copenhagen University , Universitetsparken 2, Copenhagen E DK-2100, Denmark
| | - Nanna Bøgelund
- Department of Pharmacy, Copenhagen University , Universitetsparken 2, Copenhagen E DK-2100, Denmark
| | - Tam T T N Nguyen
- Department of Pharmacy, Copenhagen University , Universitetsparken 2, Copenhagen E DK-2100, Denmark
| | - Henrik Flindt
- Department of Pharmacy, Copenhagen University , Universitetsparken 2, Copenhagen E DK-2100, Denmark
| | - Jörg P Kutter
- Department of Pharmacy, Copenhagen University , Universitetsparken 2, Copenhagen E DK-2100, Denmark
| | - Kasper D Rand
- Department of Pharmacy, Copenhagen University , Universitetsparken 2, Copenhagen E DK-2100, Denmark
| | - Josiane P Lafleur
- Department of Pharmacy, Copenhagen University , Universitetsparken 2, Copenhagen E DK-2100, Denmark
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16
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Piehowski PD, Zhao R, Moore RJ, Clair G, Ansong C. Quantitative Proteomic Analysis of Mass Limited Tissue Samples for Spatially Resolved Tissue Profiling. Methods Mol Biol 2017; 1788:269-277. [PMID: 28980276 DOI: 10.1007/7651_2017_78] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Traditionally, proteomic studies have been carried out on whole tissues or organs enabling the profiling of thousands of proteins within a single LC-MS analysis. A disadvantage of this approach is that proteomes generated from whole tissues are an "average" that represents a blend of cell types and distinct anatomical regions which can obscure important biological phenomena. Laser capture microdissection (LCM) is an elegant method that allows tissue features of interest, as small as a single cell, to be identified and isolated for downstream analysis. Herein we describe an approach that utilizes an immobilized enzyme reactor (IMER) coupled directly to nanoLC-MS/MS for highly sensitive, automated, quantitative proteomic analysis of the microscopic tissue specimens generated by LCM.
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Affiliation(s)
- Paul D Piehowski
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Rui Zhao
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Ronald J Moore
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Geremy Clair
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Charles Ansong
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.
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17
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Vit O, Petrak J. Integral membrane proteins in proteomics. How to break open the black box? J Proteomics 2016; 153:8-20. [PMID: 27530594 DOI: 10.1016/j.jprot.2016.08.006] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 06/30/2016] [Accepted: 08/09/2016] [Indexed: 12/22/2022]
Abstract
Integral membrane proteins (IMPs) are coded by 20-30% of human genes and execute important functions - transmembrane transport, signal transduction, cell-cell communication, cell adhesion to the extracellular matrix, and many other processes. Due to their hydrophobicity, low expression and lack of trypsin cleavage sites in their transmembrane segments, IMPs have been generally under-represented in routine proteomic analyses. However, the field of membrane proteomics has changed markedly in the past decade, namely due to the introduction of filter assisted sample preparation (FASP), the establishment of cell surface capture (CSC) protocols, and the development of methods that enable analysis of the hydrophobic transmembrane segments. This review will summarize the recent developments in the field and outline the most successful strategies for the analysis of integral membrane proteins. SIGNIFICANCE Integral membrane proteins (IMPs) are attractive therapeutic targets mostly due to their many important functions. However, our knowledge of the membrane proteome is severely limited to effectively exploit their potential. This is mostly due to the lack of appropriate techniques or methods compatible with the typical features of IMPs, namely hydrophobicity, low expression and lack of trypsin cleavage sites. This review summarizes the most recent development in membrane proteomics and outlines the most successful strategies for their large-scale analysis.
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Affiliation(s)
- O Vit
- BIOCEV, First Faculty of Medicine, Charles University in Prague, Czech Republic.
| | - J Petrak
- BIOCEV, First Faculty of Medicine, Charles University in Prague, Czech Republic
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18
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Shao S, Guo T, Gross V, Lazarev A, Koh CC, Gillessen S, Joerger M, Jochum W, Aebersold R. Reproducible Tissue Homogenization and Protein Extraction for Quantitative Proteomics Using MicroPestle-Assisted Pressure-Cycling Technology. J Proteome Res 2016; 15:1821-9. [DOI: 10.1021/acs.jproteome.5b01136] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Shiying Shao
- Department
of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich, CH-8057 Switzerland
- Division of Endocrinology, Tongji Hospital, Huazhong University of Science & Technology, Wuhan, 430030, PR China
| | - Tiannan Guo
- Department
of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich, CH-8057 Switzerland
| | - Vera Gross
- Pressure BioSciences, Inc., South Easton, Massachusetts, 02375 United States
| | - Alexander Lazarev
- Pressure BioSciences, Inc., South Easton, Massachusetts, 02375 United States
| | - Ching Chiek Koh
- Department
of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich, CH-8057 Switzerland
| | | | | | | | - Ruedi Aebersold
- Department
of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich, CH-8057 Switzerland
- Faculty of
Science, University of Zurich, Zurich, CH-8006 Switzerland
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19
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Abstract
Protein digestion using a dedicated protease represents a key element in a typical mass spectrometry (MS)-based shotgun proteomics experiment. Up to now, digestion has been predominantly performed with trypsin, mainly because of its high specificity, widespread availability and ease of use. Lately, it has become apparent that the sole use of trypsin in bottom-up proteomics may impose certain limits in our ability to grasp the full proteome, missing out particular sites of post-translational modifications, protein segments or even subsets of proteins. To overcome this problem, the proteomics community has begun to explore alternative proteases to complement trypsin. However, protocols, as well as expected results generated from these alternative proteases, have not been systematically documented. Therefore, here we provide an optimized protocol for six alternative proteases that have already shown promise in their applicability in proteomics, namely chymotrypsin, LysC, LysN, AspN, GluC and ArgC. This protocol is formulated to promote ease of use and robustness, which enable parallel digestion with each of the six tested proteases. We present data on protease availability and usage including recommendations for reagent preparation. We additionally describe the appropriate MS data analysis methods and the anticipated results in the case of the analysis of a single protein (BSA) and a more complex cellular lysate (Escherichia coli). The digestion protocol presented here is convenient and robust and can be completed in ∼2 d.
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20
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Techniques for quantitative LC–MS/MS analysis of protein therapeutics: advances in enzyme digestion and immunocapture. Bioanalysis 2016; 8:847-56. [DOI: 10.4155/bio.16.24] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
LC–MS/MS has been investigated to quantify protein therapeutics in biological matrices. The protein therapeutics is digested by an enzyme to generate surrogate peptide(s) before LC–MS/MS analysis. One challenge is isolating protein therapeutics in the presence of large number of endogenous proteins in biological matrices. Immunocapture, in which a capture agent is used to preferentially bind the protein therapeutics over other proteins, is gaining traction. The protein therapeutics is eluted for digestion and LC–MS/MS analysis. One area of tremendous potential for immunocapture-LC–MS/MS is to obtain quantitative data where ligand-binding assay alone is not sufficient, for example, quantitation of antidrug antibody complexes. Herein, we present an overview of recent advance in enzyme digestion and immunocapture applicable to protein quantitation.
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21
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Zhao Q, Fang F, Wu C, Wu Q, Liang Y, Liang Z, Zhang L, Zhang Y. imFASP: An integrated approach combining in-situ filter-aided sample pretreatment with microwave-assisted protein digestion for fast and efficient proteome sample preparation. Anal Chim Acta 2016; 912:58-64. [DOI: 10.1016/j.aca.2016.01.049] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 01/21/2016] [Accepted: 01/27/2016] [Indexed: 01/02/2023]
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22
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Gallagher ES, Hudgens JW. Mapping Protein–Ligand Interactions with Proteolytic Fragmentation, Hydrogen/Deuterium Exchange-Mass Spectrometry. Methods Enzymol 2016; 566:357-404. [DOI: 10.1016/bs.mie.2015.08.010] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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23
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Shao S, Guo T, Koh CC, Gillessen S, Joerger M, Jochum W, Aebersold R. Minimal sample requirement for highly multiplexed protein quantification in cell lines and tissues by PCT-SWATH mass spectrometry. Proteomics 2015; 15:3711-21. [DOI: 10.1002/pmic.201500161] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2015] [Revised: 07/13/2015] [Accepted: 08/12/2015] [Indexed: 12/23/2022]
Affiliation(s)
- Shiying Shao
- Division of Endocrinology, Tongji Hospital; Huazhong University of Science & Technology; Wuhan P. R. China
- Department of Biology, Institute of Molecular Systems Biology; Eidgenössische Technische Hochschule (ETH); Zurich Switzerland
| | - Tiannan Guo
- Department of Biology, Institute of Molecular Systems Biology; Eidgenössische Technische Hochschule (ETH); Zurich Switzerland
| | - Chiek Ching Koh
- Department of Biology, Institute of Molecular Systems Biology; Eidgenössische Technische Hochschule (ETH); Zurich Switzerland
| | - Silke Gillessen
- Department of Oncology/Hematology; Kantonsspital St. Gallen; St. Gallen Switzerland
| | - Markus Joerger
- Department of Oncology/Hematology; Kantonsspital St. Gallen; St. Gallen Switzerland
| | - Wolfram Jochum
- Institute of Pathology; Kantonsspital St. Gallen; St. Gallen Switzerland
| | - Ruedi Aebersold
- Department of Biology, Institute of Molecular Systems Biology; Eidgenössische Technische Hochschule (ETH); Zurich Switzerland
- Faculty of Science; University of Zurich; Zurich Switzerland
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24
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Zhang Z, Wu S, Stenoien DL, Paša-Tolić L. High-throughput proteomics. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2014; 7:427-454. [PMID: 25014346 DOI: 10.1146/annurev-anchem-071213-020216] [Citation(s) in RCA: 171] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Mass spectrometry (MS)-based high-throughput proteomics is the core technique for large-scale protein characterization. Due to the extreme complexity of proteomes, sophisticated separation techniques and advanced MS instrumentation have been developed to extend coverage and enhance dynamic range and sensitivity. In this review, we discuss the separation and prefractionation techniques applied for large-scale analysis in both bottom-up (i.e., peptide-level) and top-down (i.e., protein-level) proteomics. Different approaches for quantifying peptides or intact proteins, including label-free and stable-isotope-labeling strategies, are also discussed. In addition, we present a brief overview of different types of mass analyzers and fragmentation techniques as well as selected emerging techniques.
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25
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Zhao Q, Liang Y, Yuan H, Sui Z, Wu Q, Liang Z, Zhang L, Zhang Y. Biphasic Microreactor for Efficient Membrane Protein Pretreatment with a Combination of Formic Acid Assisted Solubilization, On-Column pH Adjustment, Reduction, Alkylation, and Tryptic Digestion. Anal Chem 2013; 85:8507-12. [DOI: 10.1021/ac402076u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Qun Zhao
- National Chromatographic R. & A. Center, Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100039, China
| | - Yu Liang
- National Chromatographic R. & A. Center, Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
| | - Huiming Yuan
- National Chromatographic R. & A. Center, Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
| | - Zhigang Sui
- National Chromatographic R. & A. Center, Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
| | - Qi Wu
- National Chromatographic R. & A. Center, Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100039, China
| | - Zhen Liang
- National Chromatographic R. & A. Center, Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
| | - Lihua Zhang
- National Chromatographic R. & A. Center, Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
| | - Yukui Zhang
- National Chromatographic R. & A. Center, Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
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26
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Analysis of biopharmaceutical proteins in biological matrices by LC-MS/MS I. Sample preparation. Trends Analyt Chem 2013. [DOI: 10.1016/j.trac.2012.11.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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27
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Switzar L, Giera M, Niessen WMA. Protein Digestion: An Overview of the Available Techniques and Recent Developments. J Proteome Res 2013; 12:1067-77. [DOI: 10.1021/pr301201x] [Citation(s) in RCA: 164] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Linda Switzar
- AIMMS Division of BioMolecular
Analysis, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands
| | - Martin Giera
- Division of Molecular Cell Physiology,
Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
- Biomolecular Mass Spectrometry
Unit, Department of Parasitology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - Wilfried M. A. Niessen
- AIMMS Division of BioMolecular
Analysis, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands
- hyphen MassSpec, de Wetstraat 8, 2332 XT Leiden, The Netherlands
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28
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Rodríguez-Suárez E, Whetton AD. The application of quantification techniques in proteomics for biomedical research. MASS SPECTROMETRY REVIEWS 2013; 32:1-26. [PMID: 22847841 DOI: 10.1002/mas.21347] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Revised: 02/09/2012] [Accepted: 02/10/2012] [Indexed: 06/01/2023]
Abstract
The systematic analysis of biological processes requires an understanding of the quantitative expression patterns of proteins, their interacting partners and their subcellular localization. This information was formerly difficult to accrue as the relative quantification of proteins relied on antibody-based methods and other approaches with low throughput. The advent of soft ionization techniques in mass spectrometry plus advances in separation technologies has aligned protein systems biology with messenger RNA, DNA, and microarray technologies to provide data on systems as opposed to singular protein entities. Another aspect of quantitative proteomics that increases its importance for the coming few years is the significant technical developments underway both for high pressure liquid chromatography and mass spectrum devices. Hence, robustness, reproducibility and mass accuracy are still improving with every new generation of instruments. Nonetheless, the methods employed require validation and comparison to design fit for purpose experiments in advanced protein analyses. This review considers the newly developed systematic protein investigation methods and their value from the standpoint that relative or absolute protein quantification is required de rigueur in biomedical research.
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29
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Ahn J, Cao MJ, Yu YQ, Engen JR. Accessing the reproducibility and specificity of pepsin and other aspartic proteases. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1834:1222-9. [PMID: 23063535 DOI: 10.1016/j.bbapap.2012.10.003] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2012] [Revised: 09/28/2012] [Accepted: 10/02/2012] [Indexed: 10/27/2022]
Abstract
The aspartic protease pepsin is less specific than other endoproteinases. Because aspartic proteases like pepsin are active at low pH, they are utilized in hydrogen deuterium exchange mass spectrometry (HDX MS) experiments for digestion under hydrogen exchange quench conditions. We investigated the reproducibility, both qualitatively and quantitatively, of online and offline pepsin digestion to understand the compliment of reproducible pepsin fragments that can be expected during a typical pepsin digestion. The collection of reproducible peptides was identified from >30 replicate digestions of the same protein and it was found that the number of reproducible peptides produced during pepsin digestion becomes constant above 5-6 replicate digestions. We also investigated a new aspartic protease from the stomach of the rice field eel (Monopterus albus Zuiew) and compared digestion efficiency and specificity to porcine pepsin and aspergillopepsin. Unique cleavage specificity was found for rice field eel pepsin at arginine, asparagine, and glycine. Different peptides produced by the various proteases can enhance protein sequence coverage and improve the spatial resolution of HDX MS data. This article is part of a Special Issue entitled: Mass spectrometry in structural biology.
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Affiliation(s)
- Joomi Ahn
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
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30
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Ahn J, Jung MC, Wyndham K, Yu YQ, Engen JR. Pepsin immobilized on high-strength hybrid particles for continuous flow online digestion at 10,000 psi. Anal Chem 2012; 84:7256-62. [PMID: 22856522 DOI: 10.1021/ac301749h] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Pepsin was immobilized on ethyl-bridged hybrid (BEH) particles, and digestion performance was evaluated in a completely online format, with the specific intent of using the particles for hydrogen-deuterium exchange mass spectrometry (HDX MS) experiments. Because the BEH particles are mechanically strong, they could withstand prolonged, continuous high-pressure at 10,000 psi. Online digestion was performed under isobaric conditions with continuous solvent flow, in contrast to other approaches where the pressure or flow is cycled. As expected, digestion efficiency at 10,000 psi was increased and reproducibly produced more peptic peptides versus digestion at 1000 psi. Prototype columns made with the BEH pepsin particles exhibited robust performance, and deuterium back-exchange was similar to that of other immobilized pepsin particles. These particles can be easily incorporated in existing HDX MS workflows to provide more peptide coverage in experiments where fast, efficient, and reproducible online pepsin digestion is desired.
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Affiliation(s)
- Joomi Ahn
- Department of Chemistry & Chemical Biology, Northeastern University, Boston, Massachusetts 02115, USA
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Lee JH, Hyung SW, Mun DG, Jung HJ, Kim H, Lee H, Kim SJ, Park KS, Moore RJ, Smith RD, Lee SW. Fully automated multifunctional ultrahigh pressure liquid chromatography system for advanced proteome analyses. J Proteome Res 2012; 11:4373-81. [PMID: 22709424 DOI: 10.1021/pr3004166] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A multifunctional liquid chromatography system that performs 1-dimensional, 2-dimensional (strong cation exchange/reverse phase liquid chromatography or SCX/RPLC) separations and online phosphopeptide enrichment using a single binary nanoflow pump has been developed. With a simple operation of a function selection valve equipped with a SCX column and a TiO2 (titanium dioxide) column, a fully automated selection of three different experiment modes was achieved. Because the current system uses essentially the same solvent flow paths, the same trap column, and the same separation column for reverse-phase separation of 1D, 2D, and online phosphopeptides enrichment experiments, the elution time information obtained from these experiments is in excellent agreement, which facilitates correlating peptide information from different experiments. The final reverse-phase separation of the three experiments is completely decoupled from all of the function selection processes; thereby salts or acids from SCX or TiO2 column do not affect the efficiency of the reverse-phase separation.
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Affiliation(s)
- Jung Hwa Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul 136-701, South Korea
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32
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Yuan H, Zhou Y, Xia S, Zhang L, Zhang X, Wu Q, Liang Z, Zhang Y. Integrated Platform for Proteome Profiling with Combination of Microreversed Phase Based Protein and Peptide Separation via Online Solvent Exchange and Protein Digestion. Anal Chem 2012; 84:5124-32. [DOI: 10.1021/ac3006796] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Angel TE, Aryal UK, Hengel SM, Baker ES, Kelly RT, Robinson EW, Smith RD. Mass spectrometry-based proteomics: existing capabilities and future directions. Chem Soc Rev 2012. [PMID: 22498958 DOI: 10.1039/c2cs15331a.mass] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2023]
Abstract
Mass spectrometry (MS)-based proteomics is emerging as a broadly effective means for identification, characterization, and quantification of proteins that are integral components of the processes essential for life. Characterization of proteins at the proteome and sub-proteome (e.g., the phosphoproteome, proteoglycome, or degradome/peptidome) levels provides a foundation for understanding fundamental aspects of biology. Emerging technologies such as ion mobility separations coupled with MS and microchip-based-proteome measurements combined with MS instrumentation and chromatographic separation techniques, such as nanoscale reversed phase liquid chromatography and capillary electrophoresis, show great promise for both broad undirected and targeted highly sensitive measurements. MS-based proteomics increasingly contribute to our understanding of the dynamics, interactions, and roles that proteins and peptides play, advancing our understanding of biology on a systems wide level for a wide range of applications including investigations of microbial communities, bioremediation, and human health.
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Affiliation(s)
- Thomas E Angel
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA
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Wu Q, Yuan H, Zhang L, Zhang Y. Recent advances on multidimensional liquid chromatography-mass spectrometry for proteomics: from qualitative to quantitative analysis--a review. Anal Chim Acta 2012; 731:1-10. [PMID: 22652259 DOI: 10.1016/j.aca.2012.04.010] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Revised: 04/09/2012] [Accepted: 04/09/2012] [Indexed: 02/08/2023]
Abstract
With the acceleration of proteome research, increasing attention has been paid to multidimensional liquid chromatography-mass spectrometry (MDLC-MS) due to its high peak capacity and separation efficiency. Recently, many efforts have been put to improve MDLC-based strategies including "top-down" and "bottom-up" to enable highly sensitive qualitative and quantitative analysis of proteins, as well as accelerate the whole analytical procedure. Integrated platforms with combination of sample pretreatment, multidimensional separations and identification were also developed to achieve high throughput and sensitive detection of proteomes, facilitating highly accurate and reproducible quantification. This review summarized the recent advances of such techniques and their applications in qualitative and quantitative analysis of proteomes.
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Affiliation(s)
- Qi Wu
- Key Laboratory of Separation Science for Analytical Chemistry, National Chromatographic Research and Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
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35
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Angel TE, Aryal UK, Hengel SM, Baker ES, Kelly RT, Robinson EW, Smith RD. Mass spectrometry-based proteomics: existing capabilities and future directions. Chem Soc Rev 2012; 41:3912-28. [PMID: 22498958 DOI: 10.1039/c2cs15331a] [Citation(s) in RCA: 263] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mass spectrometry (MS)-based proteomics is emerging as a broadly effective means for identification, characterization, and quantification of proteins that are integral components of the processes essential for life. Characterization of proteins at the proteome and sub-proteome (e.g., the phosphoproteome, proteoglycome, or degradome/peptidome) levels provides a foundation for understanding fundamental aspects of biology. Emerging technologies such as ion mobility separations coupled with MS and microchip-based-proteome measurements combined with MS instrumentation and chromatographic separation techniques, such as nanoscale reversed phase liquid chromatography and capillary electrophoresis, show great promise for both broad undirected and targeted highly sensitive measurements. MS-based proteomics increasingly contribute to our understanding of the dynamics, interactions, and roles that proteins and peptides play, advancing our understanding of biology on a systems wide level for a wide range of applications including investigations of microbial communities, bioremediation, and human health.
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Affiliation(s)
- Thomas E Angel
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA
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36
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Altelaar AFM, Heck AJR. Trends in ultrasensitive proteomics. Curr Opin Chem Biol 2012; 16:206-13. [DOI: 10.1016/j.cbpa.2011.12.011] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Revised: 12/19/2011] [Accepted: 12/19/2011] [Indexed: 11/27/2022]
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Abstract
Systems biologists frequently seek to integrate complex data sets of diverse analytes into a comprehensive picture of an organism's biological state under defined environmental conditions. Although one would prefer to collect these data from the same sample, technical limitations with traditional sample preparation methods often commit the investigator to extracting one type of analyte at the expense of losing all others. Often, volume further constrains the range of experiments that can be collected from a single sample. The practical solution employed to date has been to rely on information collected from multiple replicate experiments and similar historical or reported data. While this approach has been popular, the integration of information collected from disparate single-analyte sample preparation streams increases uncertainty due to nonalignment during comparative analysis, and such gaps accumulate quickly when combining multiple data sets. Regrettably, discontinuities between separate data streams can confound a whole understanding of the biological system being investigated. This difficulty is further compounded for researchers handling highly pathogenic samples, in which it is often necessary to use harsh chemicals or high-energy sterilization procedures that damage the target analytes. Ultra-high pressure cycling technology (PCT), also known as barocycling, is an emerging sample preparation strategy that has distinct advantages for systems biology studies because it neither commits the researcher to pursuing a specific analyte nor leads to the degradation of target material. In fact, samples prepared under pressure cycling conditions have been shown to yield a more complete set of analytes due to uniform disruption of the sample matrix coupled with an advantageous high pressure solvent environment. Fortunately, PCT safely sterilizes and extracts complex or pathogenic viral, bacterial, and spore samples without adversely affecting the constituent biomolecules valued as informative and meaningful analytes. This chapter provides procedures and findings associated with incorporating PCT into systems biology as a new and enabling approach to preanalytical sample treatment.
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Zhou H, Ning Z, E. Starr A, Abu-Farha M, Figeys D. Advancements in Top-Down Proteomics. Anal Chem 2011; 84:720-34. [DOI: 10.1021/ac202882y] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Hu Zhou
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, K1H8M5
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China 201203
| | - Zhibing Ning
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, K1H8M5
| | - Amanda E. Starr
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, K1H8M5
| | - Mohamed Abu-Farha
- Biochemistry and Molecular Biology Unit, Dasman Diabetes Institute, Dasman 15462, Kuwait
| | - Daniel Figeys
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, K1H8M5
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Tian R, Alvarez-Saavedra M, Cheng HYM, Figeys D. Uncovering the proteome response of the master circadian clock to light using an AutoProteome system. Mol Cell Proteomics 2011; 10:M110.007252. [PMID: 21859948 DOI: 10.1074/mcp.m110.007252] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
In mammals, the suprachiasmatic nucleus (SCN) is the central circadian pacemaker that governs rhythmic fluctuations in behavior and physiology in a 24-hr cycle and synchronizes them to the external environment by daily resetting in response to light. The bilateral SCN is comprised of a mere ~20,000 neurons serving as cellular oscillators, a fact that has, until now, hindered the systematic study of the SCN on a global proteome level. Here we developed a fully automated and integrated proteomics platform, termed AutoProteome system, for an in-depth analysis of the light-responsive proteome of the murine SCN. All requisite steps for a large-scale proteomic study, including preconcentration, buffer exchanging, reduction, alkylation, digestion and online two-dimensional liquid chromatography-tandem MS analysis, are performed automatically on a standard liquid chromatography-MS system. As low as 2 ng of model protein bovine serum albumin and up to 20 μg and 200 μg of SCN proteins can be readily processed and analyzed by this system. From the SCN tissue of a single mouse, we were able to confidently identify 2131 proteins, of which 387 were light-regulated based on a spectral counts quantification approach. Bioinformatics analysis of the light-inducible proteins reveals their diverse distribution in different canonical pathways and their heavy connection in 19 protein interaction networks. The AutoProteome system identified vasopressin-neurophysin 2-copeptin and casein kinase 1 delta, both of which had been previously implicated in clock timing processes, as light-inducible proteins in the SCN. Ras-specific guanine nucleotide-releasing factor 1, ubiquitin protein ligase E3A, and X-linked ubiquitin specific protease 9, none of which had previously been implicated in SCN clock timing processes, were also identified in this study as light-inducible proteins. The AutoProteome system opens a new avenue to systematically explore the proteome-wide events that occur in the SCN, either in response to light or other stimuli, or as a consequence of its intrinsic pacemaker capacity.
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Affiliation(s)
- Ruijun Tian
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, Ontario, Canada K1H 8M5
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Yu XC, Joe K, Zhang Y, Adriano A, Wang Y, Gazzano-Santoro H, Keck RG, Deperalta G, Ling V. Accurate determination of succinimide degradation products using high fidelity trypsin digestion peptide map analysis. Anal Chem 2011; 83:5912-9. [PMID: 21692515 DOI: 10.1021/ac200750u] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We report an efficient, high fidelity trypsin digestion method for peptide map analysis. This method minimizes artifacts caused by the sample preparation process, and we show its utility for the accurate determination of succinimide formation in a degraded monoclonal antibody product. A basic charge variant was detected by imaged capillary isoelectric focusing and was shown with reduced antigen binding and biological activity. Samples were reduced under denaturing conditions at pH 5.0, and digestion of the reduced protein with porcine trypsin was performed at pH 7.0 for 1 h. Following reversed phase high-performance liquid chromatography and online mass spectrometric analysis, succinimide formation was identified at Asp30 in the light chain. This result contrasts with the observation of only iso-Asp and Asp residues under conventional sample preparation conditions, which are therefore concluded to be artificially generated. The Asp30 residue is seen in the cocrystal structure model to participate in favorable charge interaction with an antigen molecule. Formation of succinimide and the resulting loss of negative charge are therefore hypothesized to be the degradation mechanism. After treatment of the degraded antibody sample to mildly alkaline pH conditions, we observed only Asp residue as the succinimide hydrolysis product and concurrent recovery of biological activity.
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Affiliation(s)
- X Christopher Yu
- Protein Analytical Chemistry and Biological Technologies, Genentech, a Member of the Roche Group, South San Francisco, California 94080-4990, United States.
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