1
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Bleskestad IH, Skadberg Ø, Åsberg A, Gøransson LG. Glycated albumin and post-transplant diabetes mellitus in kidney transplant recipients. Ann Clin Biochem 2023; 60:109-116. [PMID: 36604778 DOI: 10.1177/00045632231152074] [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: 01/07/2023]
Abstract
BACKGROUND Post-transplant diabetes mellitus is one of the most important cardiovascular risk factors after solid organ transplantation. Factors other than hyperglycaemia found in patients post-transplant, affect the level of haemoglobin A1c (HbA1c), and new markers of hyperglycaemia are needed. Our aim was to establish a 95% reference interval for glycated albumin in kidney transplant recipients, and to compare glycated albumin concentrations to the diagnostic criteria for diabetes mellitus post-transplant using oral glucose tolerance test and HbA1c. METHODS A total of 341 non-diabetic kidney transplant recipients aged ≥18 years who underwent an oral glucose tolerance test at 8 weeks and 1 year after transplantation were included. Glycated albumin was determined by liquid chromatography coupled with tandem mass spectrometry. RESULTS The 95% reference interval for glycated albumin was 8.2 (90% CI: 7.2-8.5) to 12.8% (90% CI: 12.2-13.5) which is not significantly different from our laboratory's 95% reference interval for persons without diabetes. At both 8 weeks and 1 year after transplantation, 35 patients (10.3%) fulfilled one, two or all three diagnostic criteria for diabetes mellitus. One year after transplantation, eight additional patients had glycated albumin concentration >12.8%. CONCLUSION Our findings are in accordance with the notion that kidney transplant recipients form glycation end products like normal controls as estimated by glycated albumin and HbA1c. Further studies should address glycated albumin as a supplemental tool for the diagnosis of post-transplant diabetes mellitus in kidney transplant recipients.
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Affiliation(s)
- Inger H Bleskestad
- Department of Medicine, 60496Stavanger University Hospital, Stavanger, Norway
| | - Øyvind Skadberg
- Department of Medicine, 60496Stavanger University Hospital, Stavanger, Norway
| | - Anders Åsberg
- Department of Organ Transplantation, The Norwegian Renal Registry, 155272Oslo University Hospital, Oslo, Norway.,Department of Pharmacy, University of Oslo, Oslo, Norway
| | - Lasse G Gøransson
- Department of Medicine, 60496Stavanger University Hospital, Stavanger, Norway.,Faculty of Medicine, Department of Clinical Medicine, University of Bergen, Bergen, Norway
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2
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Khanal N, Chen Z, Alelyunas YW, Szapacs ME, Wrona MD, Sikorski TW. Systematic optimization of targeted and multiplexed MS-based screening workflows for protein biomarkers. Bioanalysis 2022; 14:341-356. [PMID: 35255714 DOI: 10.4155/bio-2021-0245] [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: 11/17/2022] Open
Abstract
Background: The capability of targeted MS-based methods to simultaneously measure multiple analytes with high selectivity and sensitivity greatly facilitates the discovery and quantitation of novel biomarkers. However, the complexity of biological samples is a major bottleneck that requires extensive sample preparation. Results: This paper reports a generic workflow to optimize surrogate peptide-based protein biomarker screening for seven human proteins in a multiplexed manner without the need for any specific affinity reagents. Each step of the sample processing and LC-MS methods is systematically assessed and optimized for better analytical performance. Conclusion: The established method is used for the screening of multiple myeloma patient samples to determine which proteins could be robustly measured and serve as potential biomarkers of the disease.
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Affiliation(s)
- Neelam Khanal
- Bioanalysis, Immunogenicity & Biomarkers, In-vitro/In-vivo Translation, Research, GlaxoSmithKline, 1250 South Collegeville Rd., Collegeville, PA 19426, USA
- Scientific Operations, Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
| | - Zhuo Chen
- Bioanalysis, Immunogenicity & Biomarkers, In-vitro/In-vivo Translation, Research, GlaxoSmithKline, 1250 South Collegeville Rd., Collegeville, PA 19426, USA
| | - Yun W Alelyunas
- Scientific Operations, Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
| | - Matthew E Szapacs
- Bioanalysis, Immunogenicity & Biomarkers, In-vitro/In-vivo Translation, Research, GlaxoSmithKline, 1250 South Collegeville Rd., Collegeville, PA 19426, USA
| | - Mark D Wrona
- Scientific Operations, Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
| | - Timothy W Sikorski
- Bioanalysis, Immunogenicity & Biomarkers, In-vitro/In-vivo Translation, Research, GlaxoSmithKline, 1250 South Collegeville Rd., Collegeville, PA 19426, USA
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3
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Pirog A, Faktor J, Urban-Wojciuk Z, Kote S, Chruściel E, Arcimowicz Ł, Marek-Trzonkowska N, Vojtesek B, Hupp TR, Al Shboul S, Brennan PM, Smoleński RT, Goodlett DR, Dapic I. Comparison of different digestion methods for proteomic analysis of isolated cells and FFPE tissue samples. Talanta 2021; 233:122568. [PMID: 34215064 DOI: 10.1016/j.talanta.2021.122568] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 05/22/2021] [Accepted: 05/26/2021] [Indexed: 12/14/2022]
Abstract
Proteomics of human tissues and isolated cellular subpopulations create new opportunities for therapy and monitoring of a patients' treatment in the clinic. Important considerations in such analysis include recovery of adequate amounts of protein for analysis and reproducibility in sample collection. In this study we compared several protocols for proteomic sample preparation: i) filter-aided sample preparation (FASP), ii) in-solution digestion (ISD) and iii) a pressure-assisted digestion (PCT) method. PCT method is known for already a decade [1], however it is not widely used in proteomic research. We assessed protocols for proteome profiling of isolated immune cell subsets and formalin-fixed paraffin embedded (FFPE) tissue samples. Our results show that the ISD method has very good efficiency of protein and peptide identification from the whole proteome, while the FASP method is particularly effective in identification of membrane proteins. Pressure-assisted digestion methods generally provide lower numbers of protein/peptide identifications, but have gained in popularity due to their shorter digestion time making them considerably faster than for ISD or FASP. Furthermore, PCT does not result in substantial sample loss when applied to samples of 50 000 cells. Analysis of FFPE tissues shows comparable results. ISD method similarly yields the highest number of identifications. Furthermore, proteins isolated from FFPE samples show a significant reduction of cleavages at lysine sites due to chemical modifications with formaldehyde-such as methylation (+14 Da) being among the most common. The data we present will be helpful for making decisions about the robust preparation of clinical samples for biomarker discovery and studies on pathomechanisms of various diseases.
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Affiliation(s)
- Artur Pirog
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland
| | - Jakub Faktor
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland
| | - Zuzanna Urban-Wojciuk
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland
| | - Sachin Kote
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland
| | - Elżbieta Chruściel
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland
| | - Łukasz Arcimowicz
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland
| | - Natalia Marek-Trzonkowska
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland; Laboratory of Immunoregulation and Cellular Therapies, Department of Family Medicine, Medical University of Gdańsk, Dębinki 2, 80-210, Gdańsk, Poland
| | - Borek Vojtesek
- Research Centre for Applied Molecular Oncology (RECAMO), Masaryk Memorial Cancer Institute, 656 53, Brno, Czech Republic
| | - Ted R Hupp
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland; Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, Scotland, EH4 2XR, United Kingdom
| | - Sofian Al Shboul
- Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, Scotland, EH4 2XR, United Kingdom; Department of Basic Medical Sciences, Faculty of Medicine, The Hashemite University, Zarqa, Jordan
| | - Paul M Brennan
- Translational Neurosurgery, Centre for Clinical Brain Sciences, Bioquarter, University of Edinburgh, Edinburgh, UK
| | | | - David R Goodlett
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland; Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, V8P 5C2, Canada
| | - Irena Dapic
- International Centre for Cancer Vaccine Science, University of Gdansk, Kładki 24, 80-822, Gdańsk, Poland.
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4
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Bush JT, Chan MC, Mohammed S, Schofield CJ. Quantitative MS-Based Proteomics: Comparing the MCF-7 Cellular Response to Hypoxia and a 2-Oxoglutarate Analogue. Chembiochem 2020; 21:1647-1655. [PMID: 31919953 PMCID: PMC7317498 DOI: 10.1002/cbic.201900719] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Indexed: 12/19/2022]
Abstract
The hypoxia-inducible factors (HIFs) are key transcription factors in determining cellular responses involving alterations in protein levels in response to limited oxygen availability in animal cells. 2-Oxoglutarate-dependent oxygenases play key roles in regulating levels of HIF and its transcriptional activity. We describe MS-based proteomics studies in which we compared the results of subjecting human breast cancer MCF-7 cells to hypoxia or treating them with a cell-penetrating derivative (dimethyl N-oxalylglycine; DMOG) of the stable 2OG analogue N-oxalylglycine. The proteomic results are consistent with reported transcriptomic analyses and support the proposed key roles of 2OG-dependent HIF prolyl- and asparaginyl-hydroxylases in the hypoxic response. Differences between the data sets for hypoxia and DMOG might reflect context-dependent effects or HIF-independent effects of DMOG.
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Affiliation(s)
- Jacob T. Bush
- Chemistry Research LaboratoryDepartment of ChemistryUniversity of Oxford12 Mansfield RoadOxfordOX1 3TAUK
- Current address: GSKMedicines Research CentreGunnels Wood RoadStevenageSG1 2NYUK
| | - Mun Chiang Chan
- Chemistry Research LaboratoryDepartment of ChemistryUniversity of Oxford12 Mansfield RoadOxfordOX1 3TAUK
- Current address: Department of Molecular MedicineFaculty of MedicineUniversity of Malaya, Jalan Universiti50603Kuala LumpurMalaysia
| | - Shabaz Mohammed
- Chemistry Research LaboratoryDepartment of ChemistryUniversity of Oxford12 Mansfield RoadOxfordOX1 3TAUK
- Department of BiochemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QUUK
| | - Christopher J. Schofield
- Chemistry Research LaboratoryDepartment of ChemistryUniversity of Oxford12 Mansfield RoadOxfordOX1 3TAUK
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5
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Hakobyan A, Schneider MB, Liesack W, Glatter T. Efficient Tandem LysC/Trypsin Digestion in Detergent Conditions. Proteomics 2019; 19:e1900136. [DOI: 10.1002/pmic.201900136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 08/22/2019] [Indexed: 11/07/2022]
Affiliation(s)
- Anna Hakobyan
- Research group of Methanotrophic Bacteria, and Environmental Genomics/TranscriptomicsMax Planck Institute for Terrestrial Microbiology Karl‐von‐Frisch‐Str. 10 D‐35043 Marburg Germany
| | - Martin Bernd Schneider
- Core Facility for Mass Spectrometry and ProteomicsMax Planck Institute for Terrestrial Microbiology Karl‐von‐Frisch‐Str. 10 D‐35043 Marburg Germany
- Genomics and Proteomics Core FacilityGerman Cancer Research Center Im Neuenheimer Feld 580 D‐69120 Heidelberg Germany
| | - Werner Liesack
- Research group of Methanotrophic Bacteria, and Environmental Genomics/TranscriptomicsMax Planck Institute for Terrestrial Microbiology Karl‐von‐Frisch‐Str. 10 D‐35043 Marburg Germany
- Center for Synthetic Microbiology (SYNMIKRO)Philipps‐Universität Marburg Karl‐von‐Frisch‐Str. 16 D‐35043 Marburg Germany
| | - Timo Glatter
- Core Facility for Mass Spectrometry and ProteomicsMax Planck Institute for Terrestrial Microbiology Karl‐von‐Frisch‐Str. 10 D‐35043 Marburg Germany
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6
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Dapic I, Baljeu-Neuman L, Uwugiaren N, Kers J, Goodlett DR, Corthals GL. Proteome analysis of tissues by mass spectrometry. MASS SPECTROMETRY REVIEWS 2019; 38:403-441. [PMID: 31390493 DOI: 10.1002/mas.21598] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Accepted: 06/17/2019] [Indexed: 06/10/2023]
Abstract
Tissues and biofluids are important sources of information used for the detection of diseases and decisions on patient therapies. There are several accepted methods for preservation of tissues, among which the most popular are fresh-frozen and formalin-fixed paraffin embedded methods. Depending on the preservation method and the amount of sample available, various specific protocols are available for tissue processing for subsequent proteomic analysis. Protocols are tailored to answer various biological questions, and as such vary in lysis and digestion conditions, as well as duration. The existence of diverse tissue-sample protocols has led to confusion in how to choose the best protocol for a given tissue and made it difficult to compare results across sample types. Here, we summarize procedures used for tissue processing for subsequent bottom-up proteomic analysis. Furthermore, we compare protocols for their variations in the composition of lysis buffers, digestion procedures, and purification steps. For example, reports have shown that lysis buffer composition plays an important role in the profile of extracted proteins: the most common are tris(hydroxymethyl)aminomethane, radioimmunoprecipitation assay, and ammonium bicarbonate buffers. Although, trypsin is the most commonly used enzyme for proteolysis, in some protocols it is supplemented with Lys-C and/or chymotrypsin, which will often lead to an increase in proteome coverage. Data show that the selection of the lysis procedure might need to be tissue-specific to produce distinct protocols for individual tissue types. Finally, selection of the procedures is also influenced by the amount of sample available, which range from biopsies or the size of a few dozen of mm2 obtained with laser capture microdissection to much larger amounts that weight several milligrams.
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Affiliation(s)
- Irena Dapic
- International Centre for Cancer Vaccine Science, University of Gdansk, Gdansk, Poland
| | | | - Naomi Uwugiaren
- International Centre for Cancer Vaccine Science, University of Gdansk, Gdansk, Poland
| | - Jesper Kers
- Department of Pathology, Amsterdam Infection & Immunity Institute (AI&II), Amsterdam Cardiovascular Sciences (ACS), Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam, The Netherlands
- Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Cambridge, MA
| | - David R Goodlett
- International Centre for Cancer Vaccine Science, University of Gdansk, Gdansk, Poland
- University of Maryland, 20N. Pine Street, Baltimore, MD 21201
| | - Garry L Corthals
- van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam, The Netherlands
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7
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Nitride C, Nørgaard J, Omar J, Emons H, Esteso MJM, O'Connor G. An assessment of the impact of extraction and digestion protocols on multiplexed targeted protein quantification by mass spectrometry for egg and milk allergens. Anal Bioanal Chem 2019; 411:3463-3475. [PMID: 31139860 PMCID: PMC6571087 DOI: 10.1007/s00216-019-01816-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 03/22/2019] [Accepted: 03/28/2019] [Indexed: 12/21/2022]
Abstract
The unintentional presence of even trace amounts of certain foods constitutes a major hazard for those who suffer from food allergies. For many food industries, product and raw ingredient surveillance forms part of their risk assessment procedures. This may require the detection of multiple allergens in a wide variety of matrices. Mass spectrometry offers a possible solution for the quantification of multiple allergens in a single analysis. The capability of MS to quantify many peptides from a complex protein digestion is well known. However, a lack of matrix certified reference materials has made the optimisation of extraction and digestion conditions for multiplexed allergen quantification difficult to assess. Here, we report a systematic study, using preliminary screening followed by a Design of Experiments approach, to find the optimal buffer and digestion conditions for detecting milk and egg protein markers in a model processed food matrix. Five of the most commonly used buffers, two chaotropic reagents and two reducing reagents were assessed for the optimal extraction of multiple protein markers. While the choice of background buffer had little impact, the use of chaotropic and reducing reagents showed significant benefits for the extraction of most proteins. A full factorial design experiment was applied to the parameters shown to have a significant impact on protein recovery. These studies suggest that a single optimal set of extraction conditions enabling the quantitative recovery of all proteins is not easily achieved. Therefore, although MS is capable of the simultaneous quantification of many peptides in a single run, greater consideration of protein extraction is required before these are applied for multiplex allergen quantification in food matrices. Graphical abstract.
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Affiliation(s)
- Chiara Nitride
- European Commission, Directorate-General Joint Research Centre, Retieseweg 111, 2440, Geel, Belgium.,School of Biological Sciences, Division of Infection, Immunity and Respiratory Medicine, Manchester Academic Health Science Centre, Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester, UK
| | - Jørgen Nørgaard
- European Commission, Directorate-General Joint Research Centre, Retieseweg 111, 2440, Geel, Belgium
| | - Jone Omar
- European Commission, Directorate-General Joint Research Centre, Retieseweg 111, 2440, Geel, Belgium
| | - Hendrik Emons
- European Commission, Directorate-General Joint Research Centre, Retieseweg 111, 2440, Geel, Belgium
| | | | - Gavin O'Connor
- European Commission, Directorate-General Joint Research Centre, Retieseweg 111, 2440, Geel, Belgium. .,Fachbereich 3.2 Biochemie, Physikalisch-Technische Bundesanstalt, Bundesalle 100, 38116, Braunschweig, Germany.
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8
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Acetonitrile-assisted enzymatic digestion can facilitate the bottom-up identification of proteins of cancer origin. Anal Biochem 2019; 570:1-4. [DOI: 10.1016/j.ab.2019.01.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 01/09/2019] [Accepted: 01/14/2019] [Indexed: 02/07/2023]
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9
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Melville D, Gorur A, Schekman R. Fatty-acid binding protein 5 modulates the SAR1 GTPase cycle and enhances budding of large COPII cargoes. Mol Biol Cell 2018; 30:387-399. [PMID: 30485159 PMCID: PMC6589570 DOI: 10.1091/mbc.e18-09-0548] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
COPII-coated vesicles are the primary mediators of ER-to-Golgi trafficking. Sar1, one of the five core COPII components, is a highly conserved small GTPase, which, upon GTP binding, recruits the other COPII proteins to the ER membrane. It has been hypothesized that the changes in the kinetics of SAR1 GTPase may allow for the secretion of large cargoes. Here we developed a cell-free assay to recapitulate COPII-dependent budding of large lipoprotein cargoes from the ER. We identified fatty-acid binding protein 5 (FABP5) as an enhancer of this budding process. We found that FABP5 promotes the budding of particles ∼150 nm in diameter and modulates the kinetics of the SAR1 GTPase cycle. We further found that FABP5 enhances the trafficking of lipoproteins and of other cargoes, including collagen. These data identify a novel regulator of SAR1 GTPase activity and highlight the importance of this activity for trafficking of large cargoes.
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Affiliation(s)
- David Melville
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720
| | - Amita Gorur
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720
| | - Randy Schekman
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720
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10
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Iliuk A. Identification of Phosphorylated Proteins on a Global Scale. CURRENT PROTOCOLS IN CHEMICAL BIOLOGY 2018; 10:e48. [PMID: 29927094 PMCID: PMC6125197 DOI: 10.1002/cpch.48] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Liquid chromatography (LC) coupled with tandem mass spectrometry (MS/MS) has enabled researchers to analyze complex biological samples with unprecedented depth. It facilitates the identification and quantification of modifications within thousands of proteins in a single large-scale proteomic experiment. Analysis of phosphorylation, one of the most common and important post-translational modifications, has particularly benefited from such progress in the field. Here, detailed protocols are provided for a few well-regarded, common sample preparation methods for an effective phosphoproteomic experiment. © 2018 by John Wiley & Sons, Inc.
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Affiliation(s)
- Anton Iliuk
- Tymora Analytical Operations, Innovations, West Lafayette, Indiana
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11
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Wu Z, Huang J, Huang J, Li Q, Zhang X. Lys-C/Arg-C, a More Specific and Efficient Digestion Approach for Proteomics Studies. Anal Chem 2018; 90:9700-9707. [DOI: 10.1021/acs.analchem.8b02448] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Zhen Wu
- State Key Laboratory of Genetic Engineering, Department of Biochemistry, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Jichang Huang
- State Key Laboratory of Genetic Engineering, Department of Biochemistry, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Jingnan Huang
- State Key Laboratory of Genetic Engineering, Department of Biochemistry, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Qingqing Li
- State Key Laboratory of Genetic Engineering, Department of Biochemistry, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Xumin Zhang
- State Key Laboratory of Genetic Engineering, Department of Biochemistry, School of Life Sciences, Fudan University, Shanghai 200438, China
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12
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Taoka M, Fujii M, Tsuchiya M, Uekita T, Ichimura T. A Sensitive Microbead-Based Organic Media-Assisted Method for Proteomics Sample Preparation from Dilute and Denaturing Solutions. ACS APPLIED MATERIALS & INTERFACES 2017; 9:42661-42667. [PMID: 29161009 DOI: 10.1021/acsami.7b16095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We developed a robust and sensitive sample preparation method for proteomics termed microbead-based and organic-media-assisted proteolysis strategy (BOPs). BOPs combines two advantages of current techniques, (1) unbiased binding of reversed-phase polymeric microbeads to any type of protein and (2) enhanced trypsin digestion efficiency in CH3CN-aqueous solvent systems, into a single-tube workflow. Compared with conventional techniques, this method effectively concentrates proteins and improves proteolytic digestion, and can be used with submicromolar protein samples in dilute or denaturing solutions, such as 70% formic acid, 8 M urea, or 7 M guanidine hydrochloride without any sample pretreatment. Proteome analysis of single Caenorhabditis elegans organisms demonstrates that BOPs has the sensitivity, reproducibility, and unbiasedness required to characterize worm proteins at a single organism level. We also show that, by simply incorporating an acetone washing step for detergent removal, BOPs is applicable to low concentration samples contaminated with a variety of detergents, including sodium dodecyl sulfate, with negligible protein loss. Moreover, the utility of this modification has also been demonstrated through proteomic characterization of 2000 human (HEK293T) cells lysed using 1% Triton X-100. The simplicity and availability of the present BOPs make it especially attractive for next-stage proteomics of rare and sample-limited systems.
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Affiliation(s)
- Masato Taoka
- Department of Chemistry, Tokyo Metropolitan University , Tokyo 192-0397, Japan
| | - Michihiko Fujii
- Graduate School of Nanobioscience, Yokohama City University , Yokohama 236-0027, Japan
| | - Masahiro Tsuchiya
- Department of Applied Chemistry, National Defense Academy , Yokosuka 239-8686, Japan
| | - Takamasa Uekita
- Department of Applied Chemistry, National Defense Academy , Yokosuka 239-8686, Japan
| | - Tohru Ichimura
- Department of Applied Chemistry, National Defense Academy , Yokosuka 239-8686, Japan
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13
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Qu M, An B, Shen S, Zhang M, Shen X, Duan X, Balthasar JP, Qu J. Qualitative and quantitative characterization of protein biotherapeutics with liquid chromatography mass spectrometry. MASS SPECTROMETRY REVIEWS 2017; 36:734-754. [PMID: 27097288 DOI: 10.1002/mas.21500] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 03/02/2016] [Indexed: 06/05/2023]
Abstract
In the last decade, the advancement of liquid chromatography mass spectrometry (LC/MS) techniques has enabled their broad application in protein characterization, both quantitatively and qualitatively. Owing to certain important merits of LC/MS techniques (e.g., high selectivity, flexibility, and rapid method development), LC/MS assays are often deemed as preferable alternatives to conventional methods (e.g., ligand-binding assays) for the analysis of protein biotherapeutics. At the discovery and development stages, LC/MS is generally employed for two purposes absolute quantification of protein biotherapeutics in biological samples and qualitative characterization of proteins. For absolute quantification of a target protein in bio-matrices, recent work has led to improvements in the efficiency of LC/MS method development, sample treatment, enrichment and digestion, and high-performance low-flow-LC separation. These advances have enhanced analytical sensitivity, specificity, and robustness. As to qualitative analysis, a range of techniques have been developed to characterize intramolecular disulfide bonds, glycosylation, charge variants, primary sequence heterogeneity, and the drug-to-antibody ratio of antibody drug conjugate (ADC), which has enabled a refined ability to assess product quality. In this review, we will focus on the discussion of technical challenges and strategies of LC/MS-based quantification and characterization of biotherapeutics, with the emphasis on the analysis of antibody-based biotherapeutics such as monoclonal antibodies (mAbs) and ADCs. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 36:734-754, 2017.
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Affiliation(s)
- Miao Qu
- Beijing University of Chinese Medicine, Beijing, 100029, China
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, NY, 14214
- New York State Center of Excellence in Bioinformatics and Life Sciences, Buffalo, NY, 14203
| | - Bo An
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, NY, 14214
- New York State Center of Excellence in Bioinformatics and Life Sciences, Buffalo, NY, 14203
| | - Shichen Shen
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, NY, 14214
- New York State Center of Excellence in Bioinformatics and Life Sciences, Buffalo, NY, 14203
| | - Ming Zhang
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, NY, 14214
- New York State Center of Excellence in Bioinformatics and Life Sciences, Buffalo, NY, 14203
| | - Xiaomeng Shen
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, NY, 14214
- New York State Center of Excellence in Bioinformatics and Life Sciences, Buffalo, NY, 14203
| | - Xiaotao Duan
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing, 100850, China
| | - Joseph P Balthasar
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, NY, 14214
| | - Jun Qu
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, NY, 14214
- New York State Center of Excellence in Bioinformatics and Life Sciences, Buffalo, NY, 14203
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14
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Dapic I, Uwugiaren N, Jansen PJ, Corthals GL. Fast and Simple Protocols for Mass Spectrometry-Based Proteomics of Small Fresh Frozen Uterine Tissue Sections. Anal Chem 2017; 89:10769-10775. [PMID: 28910098 PMCID: PMC5647562 DOI: 10.1021/acs.analchem.7b01937] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
![]()
Human
tissues are an important link between organ-specific spatial
molecular information, patient pathology, and patient treatment options.
However, patient tissues are uniquely obtained by time and location,
and limited in their availability and size. Currently, little knowledge
exists about appropriate and simplified protocols for routine MS-based
analysis of the various types and sizes of tissues. Following standard
procedures used in pathology, we selected small fresh frozen uterine
tissue samples to investigate how the tissue preparation protocol
affected the subsequent proteomics analysis. First, we observed that
protein extraction with 0.1% SDS followed by extraction with a 30%
ACN/urea resulted in a decrease in the number of identified proteins,
when compared to extraction with 30% ACN/urea only. The decrease in
the number of proteins was approximately 55% and 20%, for 10 and 16
μm thick tissue, respectively. Interestingly, the relative abundance
of the proteins shared between the two methods was higher when SDS/ACN/urea
was used, compared to the 30% ACN/urea extraction, indicating the
role of SDS to be beneficial for protein solubility. Second, the influence
of tissue thickness was investigated by comparing the results obtained
for 10, 16, and 20 μm thick (1 mm2) tissue using
urea/30% ACN. We observed an increase in the number of identified
proteins and corresponding quantity with an increase in the tissue
thickness. Finally, by analyzing very small amounts of tissues (∼0.2
mm2) of 10, 16, and 20 μm thickness, we observed
that the increase in tissue thickness resulted in a higher number
of protein identifications and corresponding quantitative values.
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Affiliation(s)
- Irena Dapic
- University of Amsterdam, Van 't Hoff Institute for Molecular Sciences (HIMS) , Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Naomi Uwugiaren
- University of Amsterdam, Van 't Hoff Institute for Molecular Sciences (HIMS) , Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Petra J Jansen
- University of Amsterdam, Van 't Hoff Institute for Molecular Sciences (HIMS) , Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Garry L Corthals
- University of Amsterdam, Van 't Hoff Institute for Molecular Sciences (HIMS) , Science Park 904, 1098 XH Amsterdam, The Netherlands
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15
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Sharp JL, Borkowski JJ. A conditional frequency distribution test for analyzing 2×ctables. Stat Probab Lett 2016. [DOI: 10.1016/j.spl.2016.08.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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16
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Devi S, Wu BH, Chu PY, Liu YP, Wu HL, Ho YP. Studying the effect of microwave heating on the digestion process and identification of proteins. Electrophoresis 2016; 38:429-440. [PMID: 27770443 DOI: 10.1002/elps.201600392] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 10/06/2016] [Accepted: 10/12/2016] [Indexed: 11/07/2022]
Abstract
The impact of microwave irradiation on the in-solution digestion processes and the detection limit of proteins are systematically studied. Kinetic processes of many peptides produced through the trypsin digestion of various proteins under microwave heating at 50°C were investigated with MALDI-MS. This study also examines the detection limits and digestion completeness of individual proteins under microwave heating at 50°C and at different time intervals (1, 5 and 30 min) using LC-MS. We conclude that if the peptides without missed cleavage dictate the detection limit, conventional digestion will lead to a better detection limit. The detection limit may not differ between the microwave and conventional heating if the peptides with missed cleavage sites and strong intensity are formed at the very early stage (i.e., less than 1 min) and are not further digested throughout the entire digestion process. The digestion of Escherichia coli lysate was compared under conventional and short time (microwave) conditions. The number of proteins identified under conventional heating exceeded that obtained from microwave heating over heating periods less than 5 min. The overall results show that the microwave-assisted digestion is not complete. Although the sequence coverage might be better, the detection limit might be worse than that under conventional heating.
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Affiliation(s)
- Shobha Devi
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan
| | - Bo-Hung Wu
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan
| | - Pei-Yu Chu
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan
| | - Yue-Pei Liu
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan
| | - Hsin-Lin Wu
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan
| | - Yen-Peng Ho
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan
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17
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Qi Q, Yan G, Deng C, Zhang X. A novel protocol for enzymatic digestion based on covalent binding by protein immobilization. Anal Bioanal Chem 2016; 408:8437-8445. [PMID: 27757514 DOI: 10.1007/s00216-016-9964-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 09/04/2016] [Accepted: 09/20/2016] [Indexed: 11/30/2022]
Abstract
The process of protein digestion is a critical step for successful protein identification in proteomic analysis. Many efforts have been dedicated to enhancing the digestion efficiency for sufficient digestion. Among these approaches, protein complete denaturation with denaturants is a common process for better digestion. However, the removal of denaturants was tedious or would cause protein loss and other problems. In this work, a feasible digestion approach, immobilized protein digestion (IPD), based on covalent binding has been developed. Proteins can be completely denatured and immobilized on the surface of functional materials by covalent binding to form a monolayer. Subsequently, varieties of denaturants or contaminants would be removed thoroughly by washing. To achieve fast immobilization and high digestion efficiency, different functional materials and denaturants were selected. Compared with traditional in-solution digestion, the method achieved a prominent increase in identified peptides numbers and sequence coverage of proteins. Data analysis also showed that covalent binding could evidently decrease enzymatic missed cleavage for various protein sequences. Furthermore, possible peptide losses due to covalent binding were also investigated. Also, it has been proved to be efficient for complex biological sample digestion. Graphical abstract Workflow of the IPD method, including protein denaturation, immobilization, digestion, and identification.
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Affiliation(s)
- Qian Qi
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200433, China
| | - Guoquan Yan
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200433, China
| | - Chunhui Deng
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200433, China
| | - Xiangmin Zhang
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200433, China.
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18
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Parr MK, Montacir O, Montacir H. Physicochemical characterization of biopharmaceuticals. J Pharm Biomed Anal 2016; 130:366-389. [DOI: 10.1016/j.jpba.2016.05.028] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Revised: 05/16/2016] [Accepted: 05/17/2016] [Indexed: 12/26/2022]
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19
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Glatter T, Ahrné E, Schmidt A. Comparison of Different Sample Preparation Protocols Reveals Lysis Buffer-Specific Extraction Biases in Gram-Negative Bacteria and Human Cells. J Proteome Res 2015; 14:4472-85. [PMID: 26412744 DOI: 10.1021/acs.jproteome.5b00654] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We evaluated different in-solution and FASP-based sample preparation strategies for absolute protein quantification. Label-free quantification (LFQ) was employed to compare different sample preparation strategies in the bacterium Pseudomonas aeruginosa and human embryonic kidney cells (HEK), and organismal-specific differences in general performance and enrichment of specific protein classes were noted. The original FASP protocol globally enriched for most proteins in the bacterial sample, whereas the sodium deoxycholate in-solution strategy was more efficient with HEK cells. Although detergents were found to be highly suited for global proteome analysis, higher intensities were obtained for high-abundant nucleic acid-associated protein complexes, like the ribosome and histone proteins, using guanidine hydrochloride. Importantly, we show for the first time that the observable total proteome mass of a sample strongly depends on the sample preparation protocol, with some protocols resulting in a significant underestimation of protein mass due to incomplete protein extraction of biased protein groups. Furthermore, we demonstrate that some of the observed abundance biases can be overcome by incorporating a nuclease treatment step or, alternatively, a correction factor for complementary sample preparation approaches.
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Affiliation(s)
- Timo Glatter
- Proteomics Core Facility, Biozentrum, University of Basel , 4056 Basel, Switzerland
| | - Erik Ahrné
- Proteomics Core Facility, Biozentrum, University of Basel , 4056 Basel, Switzerland
| | - Alexander Schmidt
- Proteomics Core Facility, Biozentrum, University of Basel , 4056 Basel, Switzerland
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20
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Metaproteomic evidence of changes in protein expression following a change in electrode potential in a robust biocathode microbiome. Proteomics 2015; 15:3486-96. [DOI: 10.1002/pmic.201400585] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 07/23/2015] [Accepted: 08/05/2015] [Indexed: 11/07/2022]
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21
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Wohlgemuth I, Lenz C, Urlaub H. Studying macromolecular complex stoichiometries by peptide-based mass spectrometry. Proteomics 2015; 15:862-79. [PMID: 25546807 PMCID: PMC5024058 DOI: 10.1002/pmic.201400466] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 11/24/2014] [Accepted: 12/22/2014] [Indexed: 11/11/2022]
Abstract
A majority of cellular functions are carried out by macromolecular complexes. A host of biochemical and spectroscopic methods exists to characterize especially protein/protein complexes, however there has been a lack of a universal method to determine protein stoichiometries. Peptide‐based MS, especially as a complementary method to the MS analysis of intact protein complexes, has now been developed to a point where it can be employed to assay protein stoichiometries in a routine manner. While the experimental demands are still significant, peptide‐based MS has been successfully applied to analyze stoichiometries for a variety of protein complexes from very different biological backgrounds. In this review, we discuss the requirements especially for targeted MS acquisition strategies to be used in this context, with a special focus on the interconnected experimental aspects of sample preparation, protein digestion, and peptide stability. In addition, different strategies for the introduction of quantitative peptide standards and their suitability for different scenarios are compared.
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Affiliation(s)
- Ingo Wohlgemuth
- Department of Physical Biochemistry, Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
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22
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Feist P, Hummon AB. Proteomic challenges: sample preparation techniques for microgram-quantity protein analysis from biological samples. Int J Mol Sci 2015; 16:3537-63. [PMID: 25664860 PMCID: PMC4346912 DOI: 10.3390/ijms16023537] [Citation(s) in RCA: 180] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 01/29/2015] [Indexed: 12/22/2022] Open
Abstract
Proteins regulate many cellular functions and analyzing the presence and abundance of proteins in biological samples are central focuses in proteomics. The discovery and validation of biomarkers, pathways, and drug targets for various diseases can be accomplished using mass spectrometry-based proteomics. However, with mass-limited samples like tumor biopsies, it can be challenging to obtain sufficient amounts of proteins to generate high-quality mass spectrometric data. Techniques developed for macroscale quantities recover sufficient amounts of protein from milligram quantities of starting material, but sample losses become crippling with these techniques when only microgram amounts of material are available. To combat this challenge, proteomicists have developed micro-scale techniques that are compatible with decreased sample size (100 μg or lower) and still enable excellent proteome coverage. Extraction, contaminant removal, protein quantitation, and sample handling techniques for the microgram protein range are reviewed here, with an emphasis on liquid chromatography and bottom-up mass spectrometry-compatible techniques. Also, a range of biological specimens, including mammalian tissues and model cell culture systems, are discussed.
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Affiliation(s)
- Peter Feist
- Department of Chemistry and Biochemistry, Integrated Biomedical Sciences Program, and the Harper Cancer Research Institute, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Amanda B Hummon
- Department of Chemistry and Biochemistry, Integrated Biomedical Sciences Program, and the Harper Cancer Research Institute, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, USA.
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23
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Dittrich J, Becker S, Hecht M, Ceglarek U. Sample preparation strategies for targeted proteomics via proteotypic peptides in human blood using liquid chromatography tandem mass spectrometry. Proteomics Clin Appl 2014; 9:5-16. [PMID: 25418444 DOI: 10.1002/prca.201400121] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 10/29/2014] [Accepted: 11/18/2014] [Indexed: 11/07/2022]
Abstract
The simultaneous quantification of protein concentrations via proteotypic peptides in human blood by liquid chromatography coupled to quadrupole MS/MS is an important field of bioanalytical research with a high potential for routine diagnostic applications. This review summarizes currently available sample preparation procedures and trends for absolute protein quantification in blood using LC-MS/MS. It discusses approaches of transferring established qualitative protocols to a quantitative analysis regarding their reliability and reproducibility. Techniques used to enhance method sensitivity such as the depletion of high-abundant proteins or the immunoaffinity enrichment of proteins and peptides are described. Furthermore, workflows for (i) protein denaturation, (ii) disulfide bridge reduction and (iii) thiol alkylation as well as (iv) enzymatic digestion for absolute protein quantification are presented. The main focus is on the tryptic digestion as a bottleneck of protein quantification via proteotypic peptides. Conclusively, requirements for a high-throughput application are discussed.
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Affiliation(s)
- Julia Dittrich
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Hospital Leipzig, Leipzig, Germany; LIFE - Leipzig Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany
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24
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Larssen E, Brede C, Hjelle AB, Øysaed KB, Tjensvoll AB, Omdal R, Ruoff P. A rapid method for preparation of the cerebrospinal fluid proteome. Proteomics 2014; 15:10-5. [DOI: 10.1002/pmic.201400096] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 07/18/2014] [Accepted: 10/06/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Eivind Larssen
- Research Department; Stavanger University Hospital; Stavanger Norway
- International Research Institute of Stavanger, IRIS Envrionment; Stavanger Norway
| | - Cato Brede
- Department of Medical Biochemistry; Stavanger University Hospital; Stavanger Norway
| | | | - Kjell Birger Øysaed
- International Research Institute of Stavanger, IRIS Envrionment; Stavanger Norway
| | | | - Roald Omdal
- Clinical Immunology Unit; Department of Internal Medicine; Stavanger University Hospital; Stavanger Norway
- Department of Medical Science; Faculty of Medicine and Dentistry; University of Bergen; Bergen Norway
| | - Peter Ruoff
- Center for Organelle Research (CORE); University of Stavanger; Stavanger Norway
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25
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Wu S, Zhang H, Yang K, Ma J, Liang Z, Zhang L, Zhang Y. A rapid protein sample preparation method based on organic-aqueous microwave irradiation technique. Sci China Chem 2014. [DOI: 10.1007/s11426-014-5163-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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26
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Lowenthal MS, Liang Y, Phinney KW, Stein SE. Quantitative bottom-up proteomics depends on digestion conditions. Anal Chem 2013; 86:551-8. [PMID: 24294946 DOI: 10.1021/ac4027274] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Accurate quantification is a fundamental requirement in the fields of proteomics and biomarker discovery, and for clinical diagnostic assays. To demonstrate the extent of quantitative variability in measurable peptide concentrations due to differences among "typical" protein digestion protocols, the model protein, human serum albumin (HSA), was subjected to enzymatic digestion using 12 different sample preparation methods, and separately, was examined through a comprehensive timecourse of trypsinolysis. A variety of digestion conditions were explored including differences in digestion time, denaturant, source of enzyme, sample cleanup, and denaturation temperature, among others. Timecourse experiments compared differences in relative peptide concentrations for tryptic digestions ranging from 15 min to 48 h. A predigested stable isotope-labeled ((15)N) form of the full-length (HSA) protein, expressed in yeast was spiked into all samples prior to LC-MS analysis to compare yields of numerous varieties of tryptic peptides. Relative quantification was achieved by normalization of integrated extracted ion chromatograms (XICs) using liquid chromatography-tandem mass spectrometry (LC-MS/MS) by multiple-reaction monitoring (MRM) on a triple quadrupole (QQQ) MS. Related peptide fragmentation transitions, and multiple peptide charge states, were monitored for validation of quantitative results. Results demonstrate that protein concentration was shown to be unequal to tryptic peptide concentrations for most peptides, including so-called "proteotypic" peptides. Peptide release during digestion displayed complex kinetics dependent on digestion conditions and, by inference, from denatured protein structure. Hydrolysis rates at tryptic cleavage sites were also shown to be affected by differences in nearest and next-nearest amino acid residues. The data suggesting nonstoichiometry of enzymatic protein digestions emphasizes the often overlooked difficulties for routine absolute protein quantification, and highlights the need for use of suitable internal standards and isotope dilution techniques.
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Affiliation(s)
- Mark S Lowenthal
- Biomolecular Measurement Division, National Institute of Standards and Technology , 100 Bureau Drive, Stop 8314, Gaithersburg, Maryland 20899-8315, United States
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27
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Walmsley SJ, Rudnick PA, Liang Y, Dong Q, Stein SE, Nesvizhskii AI. Comprehensive analysis of protein digestion using six trypsins reveals the origin of trypsin as a significant source of variability in proteomics. J Proteome Res 2013; 12:5666-80. [PMID: 24116745 DOI: 10.1021/pr400611h] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Trypsin is an endoprotease commonly used for sample preparation in proteomics experiments. Importantly, protein digestion is dependent on multiple factors, including the trypsin origin and digestion conditions. In-depth characterization of trypsin activity could lead to improved reliability of peptide detection and quantitation in both targeted and discovery proteomics studies. To this end, we assembled a data analysis pipeline and suite of visualization tools for quality control and comprehensive characterization of preanalytical variability in proteomics experiments. Using these tools, we evaluated six available proteomics-grade trypsins and their digestion of a single purified protein, human serum albumin (HSA). HSA was aliquoted and then digested for 2 or 18 h for each trypsin, and the resulting digests were desalted and analyzed in triplicate by reversed-phase liquid chromatography-tandem mass spectrometry. Peptides were identified and quantified using the NIST MSQC pipeline and a comprehensive HSA mass spectral library. We performed a statistical analysis of peptide abundances from different digests and further visualized the data using the principal component analysis and quantitative protein "sequence maps". While the performance of individual trypsins across repeat digests was reproducible, significant differences were observed depending on the origin of the trypsin (i.e., bovine vs porcine). Bovine trypsins produced a higher number of peptides containing missed cleavages, whereas porcine trypsins produced more semitryptic peptides. In addition, many cleavage sites showed variable digestion kinetics patterns, evident from the comparison of peptide abundances in 2 h vs 18 h digests. Overall, this work illustrates effects of an often neglected source of variability in proteomics experiments: the origin of the trypsin.
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Affiliation(s)
- Scott J Walmsley
- Department of Pathology, University of Michigan , 4237 Medical Science I, 1301 Catherine Road, Ann Arbor, Michigan 48109, United States
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28
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Vandermarliere E, Mueller M, Martens L. Getting intimate with trypsin, the leading protease in proteomics. MASS SPECTROMETRY REVIEWS 2013; 32:453-65. [PMID: 23775586 DOI: 10.1002/mas.21376] [Citation(s) in RCA: 136] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 02/15/2013] [Accepted: 02/15/2013] [Indexed: 05/21/2023]
Abstract
Nowadays, mass spectrometry-based proteomics is carried out primarily in a bottom-up fashion, with peptides obtained after proteolytic digest of a whole proteome lysate as the primary analytes instead of the proteins themselves. This experimental setup crucially relies on a protease to digest an abundant and complex protein mixture into a far more complex peptide mixture. Full knowledge of the working mechanism and specificity of the used proteases is therefore crucial, both for the digestion step itself as well as for the downstream identification and quantification of the (fragmentation) mass spectra acquired for the peptides in the mixture. Targeted protein analysis through selected reaction monitoring, a relative newcomer in the specific field of mass spectrometry-based proteomics, even requires a priori understanding of protease behavior for the proteins of interest. Because of the rapidly increasing popularity of proteomics as an analytical tool in the life sciences, there is now a renewed demand for detailed knowledge on trypsin, the workhorse protease in proteomics. This review addresses this need and provides an overview on the structure and working mechanism of trypsin, followed by a critical analysis of its cleavage behavior, typically simply accepted to occur exclusively yet consistently after Arg and Lys, unless they are followed by a Pro. In this context, shortcomings in our ability to understand and predict the behavior of trypsin will be highlighted, along with the downstream implications. Furthermore, an analysis is carried out on the inherent shortcomings of trypsin with regard to whole proteome analysis, and alternative approaches will be presented that can alleviate these issues. Finally, some reflections on the future of trypsin as the workhorse protease in mass spectrometry-based proteomics will be provided.
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Affiliation(s)
- Elien Vandermarliere
- Department of Medical Protein Research, VIB, B-9000 Ghent, Belgium; Department of Biochemistry, Ghent University, B-9000 Ghent, Belgium
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29
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Kim JH, Inerowicz D, Hedrick V, Regnier F. Integrated Sample Preparation Methodology for Proteomics: Analysis of Native Proteins. Anal Chem 2013; 85:8039-45. [PMID: 23937592 DOI: 10.1021/ac401477w] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Jin-Hee Kim
- Department of Chemistry and ‡Bindley Bioscience Center at Discovery Park, Purdue University, West Lafayette, Indiana
47906, United States
| | - Dorota Inerowicz
- Department of Chemistry and ‡Bindley Bioscience Center at Discovery Park, Purdue University, West Lafayette, Indiana
47906, United States
| | - Vicki Hedrick
- Department of Chemistry and ‡Bindley Bioscience Center at Discovery Park, Purdue University, West Lafayette, Indiana
47906, United States
| | - Fred Regnier
- Department of Chemistry and ‡Bindley Bioscience Center at Discovery Park, Purdue University, West Lafayette, Indiana
47906, United States
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30
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Mortensen NP, Hurst GB, Wang W, Foster CM, Nallathamby PD, Retterer ST. Dynamic development of the protein corona on silica nanoparticles: composition and role in toxicity. NANOSCALE 2013; 5:6372-80. [PMID: 23736871 DOI: 10.1039/c3nr33280b] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The formation and composition of the protein corona on silica (SiO2) nanoparticles (NP) with different surface chemistries was evaluated over time. Native SiO2, amine (-NH2) and carboxy (-COO(-)) modified NP were examined following incubation in mammalian growth media containing fetal bovine serum (FBS) for 1, 4, 24 and 48 hours. The protein corona transition from its early dynamic state to the later more stable corona was evaluated using mass spectrometry. The NP diameter was 22.4 ± 2.2 nm measured by scanning transmission electron microscopy (STEM). Changes in hydrodynamic diameter and agglomeration kinetics were studied using dynamic light scattering (DLS). The initial surface chemistry of the NP played an important role in the development and final composition of the protein corona, impacting agglomeration kinetics and NP toxicity. Particle toxicity, indicated by changes in membrane integrity and mitochondrial activity, was measured by lactate dehydrogenase (LDH) release and tetrazolium reduction (MTT), respectively, in mouse alveolar macrophages (RAW264.7) and mouse lung epithelial cells (C10). SiO2-COO(-) NP had a slower agglomeration rate, formed smaller aggregates, and exhibited lower cytotoxicity compared to SiO2 and SiO2-NH2. Composition of the protein corona for each of the three NP was unique, indicating a strong dependence of corona development on NP surface chemistry. This work underscores the need to understand all aspects of NP toxicity, particularly the influence of agglomeration on effective dose and particle size. Furthermore, the interplay between materials and local biological environment is emphasized and highlights the need to conduct toxicity profiling under physiologically relevant conditions that provide an appropriate estimation of material modifications that occur during exposure in natural environments.
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Affiliation(s)
- Ninell P Mortensen
- Biological and Nanoscale Systems Group, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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31
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Kalli A, Smith GT, Sweredoski MJ, Hess S. Evaluation and optimization of mass spectrometric settings during data-dependent acquisition mode: focus on LTQ-Orbitrap mass analyzers. J Proteome Res 2013; 12:3071-86. [PMID: 23642296 DOI: 10.1021/pr3011588] [Citation(s) in RCA: 114] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mass-spectrometry-based proteomics has evolved as the preferred method for the analysis of complex proteomes. Undoubtedly, recent advances in mass spectrometry instrumentation have greatly enhanced proteomic analysis. A popular instrument platform in proteomics research is the LTQ-Orbitrap mass analyzer. In this tutorial, we discuss the significance of evaluating and optimizing mass spectrometric settings on the LTQ-Orbitrap during CID data-dependent acquisition (DDA) mode to improve protein and peptide identification rates. We focus on those MS and MS/MS parameters that have been systematically examined and evaluated by several researchers and are commonly used during DDA. More specifically, we discuss the effect of mass resolving power, preview mode for FTMS scan, monoisotopic precursor selection, signal threshold for triggering MS/MS events, number of microscans per MS/MS scan, number of MS/MS events, automatic gain control target value (ion population) for MS and MS/MS, maximum ion injection time for MS/MS, rapid and normal scan rate, and prediction of ion injection time. We furthermore present data from the latest generation LTQ-Orbitrap system, the Orbitrap Elite, along with recommended MS and MS/MS parameters. The Orbitrap Elite outperforms the Orbitrap Classic in terms of scan speed, sensitivity, dynamic range, and resolving power and results in higher identification rates. Several of the optimized MS parameters determined on the LTQ-Orbitrap Classic and XL were easily transferable to the Orbitrap Elite, whereas others needed to be reevaluated. Finally, the Q Exactive and HCD are briefly discussed, as well as sample preparation, LC-optimization, and bioinformatics analysis. We hope this tutorial will serve as guidance for researchers new to the field of proteomics and assist in achieving optimal results.
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Affiliation(s)
- Anastasia Kalli
- Proteome Exploration Laboratory, Division of Biology, Beckman Institute, California Institute of Technology, Pasadena, California 91125, USA
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32
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Zhang Y, Fonslow BR, Shan B, Baek MC, Yates JR. Protein analysis by shotgun/bottom-up proteomics. Chem Rev 2013; 113:2343-94. [PMID: 23438204 PMCID: PMC3751594 DOI: 10.1021/cr3003533] [Citation(s) in RCA: 957] [Impact Index Per Article: 87.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Yaoyang Zhang
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Bryan R. Fonslow
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Bing Shan
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Moon-Chang Baek
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
- Department of Molecular Medicine, Cell and Matrix Biology Research Institute, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
| | - John R. Yates
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
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33
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Vuckovic D, Dagley LF, Purcell AW, Emili A. Membrane proteomics by high performance liquid chromatography-tandem mass spectrometry: Analytical approaches and challenges. Proteomics 2013; 13:404-23. [DOI: 10.1002/pmic.201200340] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Revised: 09/24/2012] [Accepted: 10/09/2012] [Indexed: 01/01/2023]
Affiliation(s)
- Dajana Vuckovic
- Banting and Best Department of Medical Research; Terrence Donnelly Centre for Cellular and Biomolecular Research; University of Toronto; Toronto ON Canada
| | - Laura F. Dagley
- Banting and Best Department of Medical Research; Terrence Donnelly Centre for Cellular and Biomolecular Research; University of Toronto; Toronto ON Canada
- Department of Biochemistry and Molecular Biology; Bio21 Molecular Science and Biotechnology Institute; University of Melbourne; Parkville Victoria Australia
| | - Anthony W. Purcell
- Department of Biochemistry and Molecular Biology; Bio21 Molecular Science and Biotechnology Institute; University of Melbourne; Parkville Victoria Australia
- Department of Biochemistry and Molecular Biology; Monash University; Clayton Victoria Australia
| | - Andrew Emili
- Banting and Best Department of Medical Research; Terrence Donnelly Centre for Cellular and Biomolecular Research; University of Toronto; Toronto ON Canada
- Department of Molecular Genetics; University of Toronto; Toronto ON Canada
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34
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Poulsen JW, Madsen CT, Young C, Poulsen FM, Nielsen ML. Using guanidine-hydrochloride for fast and efficient protein digestion and single-step affinity-purification mass spectrometry. J Proteome Res 2012. [PMID: 23186134 DOI: 10.1021/pr300883y] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Protein digestion is an integral part of the "shotgun" proteomics approach and commonly requires overnight incubation prior to mass spectrometry analysis. Quadruplicate "shotgun" proteomic analysis of whole yeast lysate demonstrated that Guanidine-Hydrochloride (Gnd-HCl) protein digestion can be optimally completed within 30 min with endoprotease Lys-C. No chemical artifacts were introduced when samples were incubated in Gnd-HCl at 95 °C, making Gnd-HCl an appropriate digestion buffer for shotgun proteomics. Current methodologies for investigating protein-protein interactions (PPIs) often require several preparation steps, which prolongs any parallel operation and high-throughput interaction analysis. Gnd-HCl allow the efficient elution and subsequent fast digestion of PPIs to provide a convenient high-throughput methodology for affinity-purification mass spectrometry (AP-MS) experiments. To validate the Gnd-HCl approach, label-free PPI analysis of several GFP-tagged yeast deubiquitinating enzymes was performed. The identification of known interaction partners demonstrates the utility of the optimized Gnd-HCl protocol that is also scalable to the 96 well-plate format.
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Affiliation(s)
- Jon W Poulsen
- Department of Proteomics, The Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Faculty of Health Sciences, DK-2200 Copenhagen
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35
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Legler PM, Leary DH, Hervey WJ, Millard CB. A role for His-160 in peroxide inhibition of S. cerevisiae S-formylglutathione hydrolase: Evidence for an oxidation sensitive motif. Arch Biochem Biophys 2012; 528:7-20. [DOI: 10.1016/j.abb.2012.08.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 07/31/2012] [Accepted: 08/03/2012] [Indexed: 01/15/2023]
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36
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Glatter T, Ludwig C, Ahrné E, Aebersold R, Heck AJR, Schmidt A. Large-scale quantitative assessment of different in-solution protein digestion protocols reveals superior cleavage efficiency of tandem Lys-C/trypsin proteolysis over trypsin digestion. J Proteome Res 2012; 11:5145-56. [PMID: 23017020 DOI: 10.1021/pr300273g] [Citation(s) in RCA: 233] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The complete and specific proteolytic cleavage of protein samples into peptides is crucial for the success of every shotgun LC-MS/MS experiment. In particular, popular peptide-based label-free and targeted mass spectrometry approaches rely on efficient generation of fully cleaved peptides to ensure accurate and sensitive protein quantification. In contrast to previous studies, we globally and quantitatively assessed the efficiency of different digestion strategies using a yeast cell lysate, label-free quantification, and statistical analysis. Digestion conditions include double tryptic, surfactant-assisted, and tandem-combinatorial Lys-C/trypsin digestion. In comparison to tryptic digests, Lys-C/trypsin digests were found most efficient to yield fully cleaved peptides while reducing the abundance of miscleaved peptides. Subsequent sequence context analysis revealed improved digestion performances of Lys-C/trypsin for miscleaved sequence stretches flanked by charged basic and particulary acidic residues. Furthermore, targeted MS analysis demonstrated a more comprehensive protein cleavage only after Lys-C/trypsin digestion, resulting in a more accurrate absolute protein quantification and extending the number of peptides suitable for SRM assay development. Therefore, we conclude that a serial Lys-C/trypsin digestion is highly attractive for most applications in quantitative MS-based proteomics building on in-solution digestion schemes.
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Affiliation(s)
- Timo Glatter
- Proteomics Core Facility, Biozentrum, Basel University, Basel, Switzerland
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37
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Booyjzsen C, Scarff CA, Moreton B, Portman I, Scrivens JH, Costantini G, Sadler PJ. Fibrillation of transferrin. Biochim Biophys Acta Gen Subj 2011; 1820:427-36. [PMID: 22119572 DOI: 10.1016/j.bbagen.2011.11.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 11/07/2011] [Accepted: 11/09/2011] [Indexed: 11/29/2022]
Abstract
BACKGROUND The nature of fibrillar deposits from aqueous solutions of human serum and recombinant human transferrin on mica and carbon-coated formvar surfaces has been investigated. METHODS AND RESULTS Atomic force microscopy showed that the deposition of recombinant transferrin onto the hydrophilic surface of mica resulted in the formation of a monolayer-thick film composed of conformationally-strained flattened protein molecules. Elongated fibres developed on top of this layer and appeared to be composed of single proteins or small clusters thereof. Monomeric and dimeric transferrins were separated by gel permeation chromatography and their states of aggregation confirmed by mass spectrometry and dynamic light scattering. Transmission electron-microscopy showed that dimeric transferrin, but not monomeric transferrin, deposited on carbon-coated formvar grids forms rounded (circular) structures ca. 250nm in diameter. Small transferrin fibrils ca. 250nm long appeared to be composed of smaller rounded sub-units. Synchrotron radiation-circular dichroism and, Congo red and thioflavin-T dye-binding experiments suggested that transferrin aggregation in solution does not involve major structural changes to the protein or formation of classical β-sheet amyloid structures. Collisional cross sections determined via ion mobility-mass spectrometry showed little difference between the overall protein shapes of apo- and holo-transferrin in the gas phase. GENERAL SIGNIFICANCE The possibility that transferrin deformation and aggregation are involved in neurological disorders such as Parkinson's and Alzheimer's disease is discussed. This article is part of a Special Issue entitled Transferrins: Molecular mechanisms of iron transport and disorders.
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Affiliation(s)
- Claire Booyjzsen
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK
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38
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Absolute quantitation of protein therapeutics in biological matrices by enzymatic digestion and LC–MS. Bioanalysis 2011; 3:2459-80. [DOI: 10.4155/bio.11.237] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The advancement of biotechnology has led to an increase in biotherapeutic drugs, especially recombinant proteins and monoclonal antibodies. Ligand-binding assays or immunoassays are the standard methods of choice in pharmacokinetic studies in support of drug discovery and development for protein therapeutics. LC–MS-based methodologies are increasingly used as alternatives to immunoassays for absolute protein quantitation in biological samples. We review recent advancements in absolute quantitation of protein therapeutics in biological matrices by enzymatic digestion and LC–MS.
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Rebecchi KR, Go EP, Xu L, Woodin CL, Mure M, Desaire H. A general protease digestion procedure for optimal protein sequence coverage and post-translational modifications analysis of recombinant glycoproteins: application to the characterization of human lysyl oxidase-like 2 glycosylation. Anal Chem 2011; 83:8484-91. [PMID: 21954900 DOI: 10.1021/ac2017037] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Using recombinant DNA technology for expression of protein therapeutics is a maturing field of pharmaceutical research and development. As recombinant proteins are increasingly utilized as biotherapeutics, improved methodologies ensuring the characterization of post-translational modifications (PTMs) are needed. Typically, proteins prepared for PTM analysis are proteolytically digested and analyzed by mass spectrometry. To ensure full coverage of the PTMs on a given protein, one must obtain complete sequence coverage of the protein, which is often quite challenging. The objective of the research described here is to design a protocol that maximizes protein sequence coverage and enables detection of post-translational modifications, specifically N-linked glycosylation. To achieve this objective, a highly efficient proteolytic digest protocol using trypsin was designed by comparing the relative merits of denaturing agents (urea and Rapigest SF), reducing agents [dithiothreitol (DTT) and tris(2-carboxyethyl)phophine (TCEP)], and various concentrations of alkylating agent [iodoacetamide (IAM)]. After analysis of human apo-transferrin using various protease digestion protocols, ideal conditions were determined to contain 6 M urea for denaturation, 5 mM TCEP for reduction, 10 mM IAM for alkylation, and 10 mM DTT, to quench excess IAM before the addition of trypsin. This method was successfully applied to a novel recombinant protein, human lysyl oxidase-like 2. Furthermore, the glycosylation PTMs were readily detected at two glycosylation sites in the protein. These digestion conditions were specifically designed for PTM analysis of recombinant proteins and biotherapeutics, and the work described herein fills an unmet need in the growing field of biopharmaceutical analysis.
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Affiliation(s)
- Kathryn R Rebecchi
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66047, United States
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40
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Urea free and more efficient sample preparation method for mass spectrometry based protein identification via combining the formic acid-assisted chemical cleavage and trypsin digestion. Talanta 2011; 86:429-35. [DOI: 10.1016/j.talanta.2011.08.052] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Revised: 08/20/2011] [Accepted: 08/26/2011] [Indexed: 11/20/2022]
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41
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Hustoft HK, Reubsaet L, Greibrokk T, Lundanes E, Malerod H. Critical assessment of accelerating trypsination methods. J Pharm Biomed Anal 2011; 56:1069-78. [PMID: 21873015 DOI: 10.1016/j.jpba.2011.08.013] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 08/03/2011] [Accepted: 08/04/2011] [Indexed: 10/17/2022]
Abstract
In LC-MS based proteomics, several accelerating trypsination methods have been introduced in order to speed up the protein digestion, which is often considered a bottleneck. Traditionally and most commonly, due to sample heterogeneity, overnight digestion at 37 °C is performed in order to digest both easily and more resistant proteins. High efficiency protein identification is important in proteomics, hours with LC-MS/MS analysis is needless if the majority of the proteins are not digested. Based on preliminary experiments utilizing some of the suggested accelerating methods, the question of whether accelerating digestion methods really provide the same protein identification efficiency as the overnight digestion was asked. In the present study we have evaluated four different accelerating trypsination methods (infrared (IR) and microwave assisted, solvent aided and immobilized trypsination). The methods were compared with conventional digestion at 37 °C in the same time range using a four protein mixture. Sequence coverage and peak area of intact proteins were used for the comparison. The accelerating methods were able to digest the proteins, but none of the methods appeared to be more efficient than the conventional digestion method at 37 °C. The conventional method at 37 °C is easy to perform using commercially available instrumentation and appears to be the digestion method to use. The digestion time in targeted proteomics can be optimized for each protein, while in comprehensive proteomics the digestion time should be extended due to sample heterogeneity and influence of other proteins present. Recommendations regarding optimizing and evaluating the tryptic digestion for both targeted and comprehensive proteomics are given, and a digestion method suitable as the first method for newcomers in comprehensive proteomics is suggested.
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Affiliation(s)
- Hanne Kolsrud Hustoft
- Department of Chemistry, University of Oslo, PO Box 1033, Blindern, NO-0315 Oslo, Norway
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42
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Wall MJ, Crowell AMJ, Simms GA, Carey GH, Liu F, Doucette AA. Implications of partial tryptic digestion in organic-aqueous solvent systems for bottom-up proteome analysis. Anal Chim Acta 2011; 703:194-203. [PMID: 21889634 DOI: 10.1016/j.aca.2011.07.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 07/08/2011] [Accepted: 07/10/2011] [Indexed: 10/17/2022]
Abstract
For bottom-up MS, the digestion step is critical and is typically performed with trypsin. Solvent-assisted digestion in 80% acetonitrile has previously been shown to improve protein sequence coverage at shorter digestion times. This has been attributed to enhanced enzyme digestion efficiency in this solvent. However, our results demonstrate that tryptic digestion in 80% acetonitrile is less efficient than that of conventional (aqueous) digestion. This is a consequence of decreased enzyme activity beyond ~40% acetonitrile, increased enzyme autolysis and lower protein solubility in 80% acetonitrile. We observe multiple missed cleavages and reduced concentration of fully cleaved digestion products. Nonetheless we confirm, through room temperature solvent-assisted digestion, a consistent improvement in protein sequence coverage when analyzed by mass spectrometry. These results are explained through the increased number of unique digestion products available for detection. Thus, while solvent-assisted digestion has clear merits for proteome analysis, one should be aware of the inefficiency of protein digestion though this protocol, particularly with absolute protein quantitation experiments.
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Affiliation(s)
- Mark J Wall
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, Halifax, NS, Canada B3H 4J3
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43
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Brownridge P, Beynon RJ. The importance of the digest: Proteolysis and absolute quantification in proteomics. Methods 2011; 54:351-60. [DOI: 10.1016/j.ymeth.2011.05.005] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 05/25/2011] [Accepted: 05/27/2011] [Indexed: 10/18/2022] Open
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44
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Choi HS, Lee SK, Kwon KH, Yoo JS, Ji K, Kim JY. Pressure Cycling Technology-assisted Protein Digestion for Efficient Proteomic Analysis. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.2.599] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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45
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Mbeunkui F, Goshe MB. Investigation of solubilization and digestion methods for microsomal membrane proteome analysis using data-independent LC-MSE. Proteomics 2011; 11:898-911. [DOI: 10.1002/pmic.200900698] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2009] [Revised: 11/11/2010] [Accepted: 12/01/2010] [Indexed: 01/09/2023]
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46
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Wu ST, Ouyang Z, Olah TV, Jemal M. A strategy for liquid chromatography/tandem mass spectrometry based quantitation of pegylated protein drugs in plasma using plasma protein precipitation with water-miscible organic solvents and subsequent trypsin digestion to generate surrogate peptides for detection. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:281-290. [PMID: 21192023 DOI: 10.1002/rcm.4856] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Recently, we have developed liquid chromatography/tandem mass spectrometry (LC/MS/MS)-based methods for the quantitation of pegylated therapeutic proteins in plasma. The methods are based on the LC/MS/MS detection of a surrogate peptide generated from trypsin digestion of the therapeutic protein. Various parameters related to the bioanalytical methods were evaluated and optimized, including the preparation of calibration standards and quality control samples, sample extraction, internal standard selection and its stage of addition, trypsin digestion, and non-specific binding. In this paper, we report the development of a method for a specific pegylated therapeutic protein and detail the various optimization steps undertaken. Simple extraction of the pegylated therapeutic protein from plasma was achieved via the precipitation of the endogenous proteins in plasma using acidic isopropanol and the resulting supernatant extract was subjected to trypsin digestion. A unique tryptic peptide arising from the pegylated therapeutic protein was used for LC/MS/MS-based detection and quantitation. A protein and a peptide were used as internal standards, with the former added before the sample extraction and the latter after the sample extraction. The method developed is simple, sensitive, specific and rugged, and has been implemented in a high throughput 96-well format to analyze plasma samples from in vivo studies. A required lower limit of quantitation (LLOQ) of 10 ng/mL, expressed in terms of the concentration of the protein drug, was easily achieved.
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Affiliation(s)
- Steven T Wu
- Bristol-Myers Squibb, Research and Development, Bioanalytical and Discovery, Analytical Sciences, Route 206 & Province Line Road, Princeton, NJ 08543, USA.
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47
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A novel organic-inorganic hybrid monolith for trypsin immobilization. SCIENCE CHINA-LIFE SCIENCES 2011; 54:54-9. [DOI: 10.1007/s11427-010-4108-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Accepted: 08/17/2010] [Indexed: 10/18/2022]
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48
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Proc JL, Kuzyk MA, Hardie DB, Yang J, Smith DS, Jackson AM, Parker CE, Borchers CH. A quantitative study of the effects of chaotropic agents, surfactants, and solvents on the digestion efficiency of human plasma proteins by trypsin. J Proteome Res 2010; 9:5422-37. [PMID: 20722421 DOI: 10.1021/pr100656u] [Citation(s) in RCA: 259] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Plasma biomarkers studies are based on the differential expression of proteins between different treatment groups or between diseased and control populations. Most mass spectrometry-based methods of protein quantitation, however, are based on the detection and quantitation of peptides, not intact proteins. For peptide-based protein quantitation to be accurate, the digestion protocols used in proteomic analyses must be both efficient and reproducible. There have been very few studies, however, where plasma denaturation/digestion protocols have been compared using absolute quantitation methods. In this paper, 14 combinations of heat, solvent [acetonitrile, methanol, trifluoroethanol], chaotropic agents [guanidine hydrochloride, urea], and surfactants [sodium dodecyl sulfate (SDS) and sodium deoxycholate (DOC)] were compared with respect to their effectiveness in improving subsequent tryptic digestion. These digestion protocols were evaluated by quantitating the production of proteotypic tryptic peptides from 45 moderate- to high-abundance plasma proteins, using tandem mass spectrometry in multiple reaction monitoring mode, with a mixture of stable-isotope labeled analogues of these proteotypic peptides as internal standards. When the digestion efficiencies of these 14 methods were compared, we found that both of the surfactants (SDS and DOC) produced an increase in the overall yield of tryptic peptides from these 45 proteins, when compared to the more commonly used urea protocol. SDS, however, can be a serious interference for subsequent mass spectrometry. DOC, on the other hand, can be easily removed from the samples by acid precipitation. Examining the results of a reproducibility study, done with 5 replicate digestions, DOC and SDS with a 9 h digestion time produced the highest average digestion efficiencies (∼80%), with the highest average reproducibility (<5% error, defined as the relative deviation from the mean value). However, because of potential interferences resulting from the use of SDS, we recommend DOC with a 9 h digestion procedure as the optimum protocol.
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Affiliation(s)
- Jennifer L Proc
- University of Victoria-Genome BC Proteomics Centre, Victoria, BC, Canada
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49
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Chatterjee D, Ytterberg AJ, Son SU, Loo JA, Garrell RL. Integration of Protein Processing Steps on a Droplet Microfluidics Platform for MALDI-MS Analysis. Anal Chem 2010; 82:2095-101. [DOI: 10.1021/ac9029373] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debalina Chatterjee
- Department of Chemistry and Biochemistry, Department of Biological Chemistry, and California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095-1569
| | - A. Jimmy Ytterberg
- Department of Chemistry and Biochemistry, Department of Biological Chemistry, and California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095-1569
| | - Sang Uk Son
- Department of Chemistry and Biochemistry, Department of Biological Chemistry, and California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095-1569
| | - Joseph A. Loo
- Department of Chemistry and Biochemistry, Department of Biological Chemistry, and California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095-1569
| | - Robin L. Garrell
- Department of Chemistry and Biochemistry, Department of Biological Chemistry, and California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095-1569
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50
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Liao L, McClatchy DB, Yates JR. Shotgun proteomics in neuroscience. Neuron 2009; 63:12-26. [PMID: 19607789 DOI: 10.1016/j.neuron.2009.06.011] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2008] [Revised: 06/10/2009] [Accepted: 06/10/2009] [Indexed: 11/27/2022]
Abstract
Mass spectrometry-based proteomics is increasingly used to address basic and clinical questions in biomedical research through studies of differential protein expression, protein-protein interactions, and posttranslational modifications. The complex structural and functional organization of the human brain warrants the application of high-throughput, systematic approaches to understand the functional alterations under normal physiological conditions and the perturbations of neurological diseases. This primer focuses on shotgun-proteomics-based tandem mass spectrometry for the identification of proteins in a complex mixture. It describes the basic concepts of protein differential expression analysis and posttranslational modification analysis and discusses several strategies to improve the coverage of the proteome.
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Affiliation(s)
- Lujian Liao
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
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