1
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Milenkovic D, Misic J, Hevler JF, Molinié T, Chung I, Atanassov I, Li X, Filograna R, Mesaros A, Mourier A, Heck AJR, Hirst J, Larsson NG. Preserved respiratory chain capacity and physiology in mice with profoundly reduced levels of mitochondrial respirasomes. Cell Metab 2023; 35:1799-1813.e7. [PMID: 37633273 DOI: 10.1016/j.cmet.2023.07.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 02/23/2023] [Accepted: 07/29/2023] [Indexed: 08/28/2023]
Abstract
The mammalian respiratory chain complexes I, III2, and IV (CI, CIII2, and CIV) are critical for cellular bioenergetics and form a stable assembly, the respirasome (CI-CIII2-CIV), that is biochemically and structurally well documented. The role of the respirasome in bioenergetics and the regulation of metabolism is subject to intense debate and is difficult to study because the individual respiratory chain complexes coexist together with high levels of respirasomes. To critically investigate the in vivo role of the respirasome, we generated homozygous knockin mice that have normal levels of respiratory chain complexes but profoundly decreased levels of respirasomes. Surprisingly, the mutant mice are healthy, with preserved respiratory chain capacity and normal exercise performance. Our findings show that high levels of respirasomes are dispensable for maintaining bioenergetics and physiology in mice but raise questions about their alternate functions, such as those relating to the regulation of protein stability and prevention of age-associated protein aggregation.
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Affiliation(s)
- Dusanka Milenkovic
- Max Planck Institute for Biology of Ageing, Joseph-Stelzmann-Strasse 9b, 50931 Cologne, Germany
| | - Jelena Misic
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Johannes F Hevler
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research, and Utrecht Institute for Pharmaceutical Sciences, University of Utrecht, Padualaan 8, Utrecht 3584 CH, the Netherlands
| | - Thibaut Molinié
- University of Bordeaux, CNRS, IBGC, UMR 5095, 33000 Bordeaux, France
| | - Injae Chung
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, Cambridge CB2 0XY, UK
| | - Ilian Atanassov
- Proteomics Core Facility, Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Xinping Li
- Proteomics Core Facility, Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Roberta Filograna
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Andrea Mesaros
- Phenotyping Core Facility, Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Arnaud Mourier
- University of Bordeaux, CNRS, IBGC, UMR 5095, 33000 Bordeaux, France
| | - Albert J R Heck
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research, and Utrecht Institute for Pharmaceutical Sciences, University of Utrecht, Padualaan 8, Utrecht 3584 CH, the Netherlands
| | - Judy Hirst
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, Cambridge CB2 0XY, UK.
| | - Nils-Göran Larsson
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden.
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2
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Wang H, Dai C, Pfeuffer J, Sachsenberg T, Sanchez A, Bai M, Perez-Riverol Y. Tissue-based absolute quantification using large-scale TMT and LFQ experiments. Proteomics 2023; 23:e2300188. [PMID: 37488995 DOI: 10.1002/pmic.202300188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 07/26/2023]
Abstract
Relative and absolute intensity-based protein quantification across cell lines, tissue atlases and tumour datasets is increasingly available in public datasets. These atlases enable researchers to explore fundamental biological questions, such as protein existence, expression location, quantity and correlation with RNA expression. Most studies provide MS1 feature-based label-free quantitative (LFQ) datasets; however, growing numbers of isobaric tandem mass tags (TMT) datasets remain unexplored. Here, we compare traditional intensity-based absolute quantification (iBAQ) proteome abundance ranking to an analogous method using reporter ion proteome abundance ranking with data from an experiment where LFQ and TMT were measured on the same samples. This new TMT method substitutes reporter ion intensities for MS1 feature intensities in the iBAQ framework. Additionally, we compared LFQ-iBAQ values to TMT-iBAQ values from two independent large-scale tissue atlas datasets (one LFQ and one TMT) using robust bottom-up proteomic identification, normalisation and quantitation workflows.
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Affiliation(s)
- Hong Wang
- Chongqing Key Laboratory of Big Data for Bio Intelligence, Chongqing University of Posts and Telecommunications, Chongqing, China
| | - Chengxin Dai
- Chongqing Key Laboratory of Big Data for Bio Intelligence, Chongqing University of Posts and Telecommunications, Chongqing, China
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Life Omics, Beijing, China
| | - Julianus Pfeuffer
- Algorithmic Bioinformatics, Freie Universität Berlin, Berlin, Germany
| | - Timo Sachsenberg
- Department of Computer Science, Applied Bioinformatics, University of Tübingen, Tübingen, Germany
- Institute for Biological and Medical Informatics, University of Tübingen, Tübingen, Germany
| | - Aniel Sanchez
- Section for Clinical Chemistry, Department of Translational Medicine, Lund University, Skåne University Hospital Malmö, Malmö, Sweden
| | - Mingze Bai
- Chongqing Key Laboratory of Big Data for Bio Intelligence, Chongqing University of Posts and Telecommunications, Chongqing, China
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Life Omics, Beijing, China
| | - Yasset Perez-Riverol
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, UK
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3
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Chen G, Jiang N, Villalobos Solis MI, Kara Murdoch F, Murdoch RW, Xie Y, Swift CM, Hettich RL, Löffler FE. Anaerobic Microbial Metabolism of Dichloroacetate. mBio 2021; 12:e00537-21. [PMID: 33906923 PMCID: PMC8092247 DOI: 10.1128/mbio.00537-21] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 03/17/2021] [Indexed: 12/23/2022] Open
Abstract
Dichloroacetate (DCA) commonly occurs in the environment due to natural production and anthropogenic releases, but its fate under anoxic conditions is uncertain. Mixed culture RM comprising "Candidatus Dichloromethanomonas elyunquensis" strain RM utilizes DCA as an energy source, and the transient formation of formate, H2, and carbon monoxide (CO) was observed during growth. Only about half of the DCA was recovered as acetate, suggesting a fermentative catabolic route rather than a reductive dechlorination pathway. Sequencing of 16S rRNA gene amplicons and 16S rRNA gene-targeted quantitative real-time PCR (qPCR) implicated "Candidatus Dichloromethanomonas elyunquensis" strain RM in DCA degradation. An (S)-2-haloacid dehalogenase (HAD) encoded on the genome of strain RM was heterologously expressed, and the purified HAD demonstrated the cofactor-independent stoichiometric conversion of DCA to glyoxylate at a rate of 90 ± 4.6 nkat mg-1 protein. Differential protein expression analysis identified enzymes catalyzing the conversion of DCA to acetyl coenzyme A (acetyl-CoA) via glyoxylate as well as enzymes of the Wood-Ljungdahl pathway. Glyoxylate carboligase, which catalyzes the condensation of two molecules of glyoxylate to form tartronate semialdehyde, was highly abundant in DCA-grown cells. The physiological, biochemical, and proteogenomic data demonstrate the involvement of an HAD and the Wood-Ljungdahl pathway in the anaerobic fermentation of DCA, which has implications for DCA turnover in natural and engineered environments, as well as the metabolism of the cancer drug DCA by gut microbiota.IMPORTANCE Dichloroacetate (DCA) is ubiquitous in the environment due to natural formation via biological and abiotic chlorination processes and the turnover of chlorinated organic materials (e.g., humic substances). Additional sources include DCA usage as a chemical feedstock and cancer drug and its unintentional formation during drinking water disinfection by chlorination. Despite the ubiquitous presence of DCA, its fate under anoxic conditions has remained obscure. We discovered an anaerobic bacterium capable of metabolizing DCA, identified the enzyme responsible for DCA dehalogenation, and elucidated a novel DCA fermentation pathway. The findings have implications for the turnover of DCA and the carbon and electron flow in electron acceptor-depleted environments and the human gastrointestinal tract.
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Affiliation(s)
- Gao Chen
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee, USA
- Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee, USA
| | - Nannan Jiang
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee, USA
- Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, Tennessee, USA
- University of Tennessee and Oak Ridge National Laboratory (UT-ORNL) Joint Institute for Biological Sciences (JIBS), Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
| | | | - Fadime Kara Murdoch
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee, USA
- University of Tennessee and Oak Ridge National Laboratory (UT-ORNL) Joint Institute for Biological Sciences (JIBS), Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
| | - Robert Waller Murdoch
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee, USA
| | - Yongchao Xie
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee, USA
- Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee, USA
| | - Cynthia M Swift
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee, USA
- Department of Microbiology, University of Tennessee, Knoxville, Tennessee, USA
| | - Robert L Hettich
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
| | - Frank E Löffler
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee, USA
- Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee, USA
- Department of Microbiology, University of Tennessee, Knoxville, Tennessee, USA
- Department of Biosystems Engineering & Soil Science, University of Tennessee, Knoxville, Tennessee, USA
- Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, Tennessee, USA
- Genome Science and Technology, University of Tennessee, Knoxville, Tennessee, USA
- University of Tennessee and Oak Ridge National Laboratory (UT-ORNL) Joint Institute for Biological Sciences (JIBS), Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
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4
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Goeminne LJE, Sticker A, Martens L, Gevaert K, Clement L. MSqRob Takes the Missing Hurdle: Uniting Intensity- and Count-Based Proteomics. Anal Chem 2020; 92:6278-6287. [PMID: 32227882 DOI: 10.1021/acs.analchem.9b04375] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Missing values are a major issue in quantitative data-dependent mass spectrometry-based proteomics. We therefore present an innovative solution to this key issue by introducing a hurdle model, which is a mixture between a binomial peptide count and a peptide intensity-based model component. It enables dramatically enhanced quantification of proteins with many missing values without having to resort to harmful assumptions for missingness. We demonstrate the superior performance of our method by comparing it with state-of-the-art methods in the field.
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Affiliation(s)
- Ludger J E Goeminne
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Krijgslaan 281-S9, B9000 Ghent, Belgium.,VIB-UGent Center for Medical Biotechnology, VIB, Albert Baertsoenkaai 3, B9000 Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Albert Baertsoenkaai 3, B9000 Ghent, Belgium.,Bioinformatics Institute Ghent, Ghent University, Technologiepark 927, B9052 Ghent, Belgium
| | - Adriaan Sticker
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Krijgslaan 281-S9, B9000 Ghent, Belgium.,VIB-UGent Center for Medical Biotechnology, VIB, Albert Baertsoenkaai 3, B9000 Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Albert Baertsoenkaai 3, B9000 Ghent, Belgium.,Bioinformatics Institute Ghent, Ghent University, Technologiepark 927, B9052 Ghent, Belgium
| | - Lennart Martens
- VIB-UGent Center for Medical Biotechnology, VIB, Albert Baertsoenkaai 3, B9000 Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Albert Baertsoenkaai 3, B9000 Ghent, Belgium.,Bioinformatics Institute Ghent, Ghent University, Technologiepark 927, B9052 Ghent, Belgium
| | - Kris Gevaert
- VIB-UGent Center for Medical Biotechnology, VIB, Albert Baertsoenkaai 3, B9000 Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Albert Baertsoenkaai 3, B9000 Ghent, Belgium
| | - Lieven Clement
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Krijgslaan 281-S9, B9000 Ghent, Belgium.,Bioinformatics Institute Ghent, Ghent University, Technologiepark 927, B9052 Ghent, Belgium
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5
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Shen S, Wang X, Orsburn BC, Qu J. How could IonStar challenge the current status quo of quantitative proteomics in large sample cohorts? Expert Rev Proteomics 2018; 15:541-543. [PMID: 29911452 DOI: 10.1080/14789450.2018.1490646] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Shichen Shen
- a Department of Pharmaceutical Sciences , School of Pharmacy and Pharmaceutical Sciences, University at Buffalo , Buffalo , NY , USA.,b New York State Center of Excellence in Bioinformatics & Life Sciences , Buffalo , NY , USA
| | - Xue Wang
- b New York State Center of Excellence in Bioinformatics & Life Sciences , Buffalo , NY , USA.,c Department of Cell Stress Biology , Roswell Park Cancer Institute , Buffalo , NY , USA
| | - Benjamin C Orsburn
- d Cancer Research Technology Program, Frederick National Laboratory for Cancer Research , Frederick , Maryland , USA
| | - Jun Qu
- a Department of Pharmaceutical Sciences , School of Pharmacy and Pharmaceutical Sciences, University at Buffalo , Buffalo , NY , USA.,b New York State Center of Excellence in Bioinformatics & Life Sciences , Buffalo , NY , USA
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6
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IonStar enables high-precision, low-missing-data proteomics quantification in large biological cohorts. Proc Natl Acad Sci U S A 2018; 115:E4767-E4776. [PMID: 29743190 DOI: 10.1073/pnas.1800541115] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Reproducible quantification of large biological cohorts is critical for clinical/pharmaceutical proteomics yet remains challenging because most prevalent methods suffer from drastically declined commonly quantified proteins and substantially deteriorated quantitative quality as cohort size expands. MS2-based data-independent acquisition approaches represent tremendous advancements in reproducible protein measurement, but often with limited depth. We developed IonStar, an MS1-based quantitative approach enabling in-depth, high-quality quantification of large cohorts by combining efficient/reproducible experimental procedures with unique data-processing components, such as efficient 3D chromatographic alignment, sensitive and selective direct ion current extraction, and stringent postfeature generation quality control. Compared with several popular label-free methods, IonStar exhibited far lower missing data (0.1%), superior quantitative accuracy/precision [∼5% intragroup coefficient of variation (CV)], the widest protein abundance range, and the highest sensitivity/specificity for identifying protein changes (<5% false altered-protein discovery) in a benchmark sample set (n = 20). We demonstrated the usage of IonStar by a large-scale investigation of traumatic injuries and pharmacological treatments in rat brains (n = 100), quantifying >7,000 unique protein groups (>99.8% without missing data across the 100 samples) with a low false discovery rate (FDR), two or more unique peptides per protein, and high quantitative precision. IonStar represents a reliable and robust solution for precise and reproducible protein measurement in large cohorts.
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7
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Abraham PE, Garcia BJ, Gunter LE, Jawdy SS, Engle N, Yang X, Jacobson DA, Hettich RL, Tuskan GA, Tschaplinski TJ. Quantitative proteome profile of water deficit stress responses in eastern cottonwood (Populus deltoides) leaves. PLoS One 2018; 13:e0190019. [PMID: 29447168 PMCID: PMC5813909 DOI: 10.1371/journal.pone.0190019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 12/06/2017] [Indexed: 12/26/2022] Open
Abstract
Drought stress is a recurring feature of world climate and the single most important factor influencing agricultural yield worldwide. Plants display highly variable, species-specific responses to drought and these responses are multifaceted, requiring physiological and morphological changes influenced by genetic and molecular mechanisms. Moreover, the reproducibility of water deficit studies is very cumbersome, which significantly impedes research on drought tolerance, because how a plant responds is highly influenced by the timing, duration, and intensity of the water deficit. Despite progress in the identification of drought-related mechanisms in many plants, the molecular basis of drought resistance remains to be fully understood in trees, particularly in poplar species because their wide geographic distribution results in varying tolerances to drought. Herein, we aimed to better understand this complex phenomenon in eastern cottonwood (Populus deltoides) by performing a detailed contrast of the proteome changes between two different water deficit experiments to identify functional intersections and divergences in proteome responses. We investigated plants subjected to cyclic water deficit and compared these responses to plants subjected to prolonged acute water deficit. In total, we identified 108,012 peptide sequences across both experiments that provided insight into the quantitative state of 22,737 Populus gene models and 8,199 functional protein groups in response to drought. Together, these datasets provide the most comprehensive insight into proteome drought responses in poplar to date and a direct proteome comparison between short period dehydration shock and cyclic, post-drought re-watering. Overall, this investigation provides novel insights into drought avoidance mechanisms that are distinct from progressive drought stress. Additionally, we identified proteins that have been associated as drought-relevant in previous studies. Importantly, we highlight the RD26 transcription factor as a gene regulated at both the transcript and protein level, regardless of species and drought condition, and, thus, represents a key, universal drought marker for Populus species.
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Affiliation(s)
- Paul E. Abraham
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Benjamin J. Garcia
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Lee E. Gunter
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Sara S. Jawdy
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Nancy Engle
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Xiaohan Yang
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Daniel A. Jacobson
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Robert L. Hettich
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Gerald A. Tuskan
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Timothy J. Tschaplinski
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
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8
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Shen X, Shen S, Li J, Hu Q, Nie L, Tu C, Wang X, Orsburn B, Wang J, Qu J. An IonStar Experimental Strategy for MS1 Ion Current-Based Quantification Using Ultrahigh-Field Orbitrap: Reproducible, In-Depth, and Accurate Protein Measurement in Large Cohorts. J Proteome Res 2017; 16:2445-2456. [PMID: 28412812 PMCID: PMC5914162 DOI: 10.1021/acs.jproteome.7b00061] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
In-depth and reproducible protein measurement in many biological samples is often critical for pharmaceutical/biomedical proteomics but remains challenging. MS1-based quantification using quadrupole/ultrahigh-field Orbitrap (Q/UHF-Orbitrap) holds great promise, but the critically important experimental approaches enabling reliable large-cohort analysis have long been overlooked. Here we described an IonStar experimental strategy achieving excellent quantitative quality of MS1 quantification. Key features include: (i) an optimized, surfactant-aided sample preparation approach provides highly efficient (>75% recovery) and reproducible (<15% CV) peptide recovery across large cell/tissue cohorts; (ii) a long column with modest gradient length (2.5 h) yields the optimal balance of depth/throughput on a Q/UHF-Orbitrap; (iii) a large-ID trap not only enables highly reproducible gradient delivery as for the first time observed via real-time conductivity monitoring, but also increases quantitative loading capacity by >8-fold and quantified >25% more proteins; (iv) an optimized HCD-OT markedly outperforms HCD-IT when analyzing large cohorts with high loading amounts; (v) selective removal of hydrophobic/hydrophilic matrix components using a novel selective trapping/delivery approach enables reproducible, robust LC-MS analysis of >100 biological samples in a single set, eliminating batch effect; (vi) MS1 acquired at higher resolution (fwhm = 120 k) provides enhanced S/N and quantitative accuracy/precision for low-abundance species. We examined this pipeline by analyzing a 5 group, 20 samples biological benchmark sample set, and quantified 6273 unique proteins (≥2 peptides/protein) under stringent cutoffs without fractionation, 6234 (>99.4%) without missing data in any of the 20 samples. The strategy achieved high quantitative accuracy (3-6% media error), low intragroup variation (6-9% media intragroup CV) and low false-positive biomarker discovery rates (3-8%) across the five groups, with quantified protein abundances spanning >6.5 orders of magnitude. Finally, this strategy is straightforward, robust, and broadly applicable in pharmaceutical/biomedical investigations.
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Affiliation(s)
- Xiaomeng Shen
- Department of Pharmaceutical Science, SUNY at Buffalo, Buffalo, New York 14228, United States
- Center of Excellence in Bioinformatics & Life Sciences, Buffalo, New York 14203, United States
| | - Shichen Shen
- Department of Biochemistry, SUNY at Buffalo, Buffalo, New York 14228, United States
- Center of Excellence in Bioinformatics & Life Sciences, Buffalo, New York 14203, United States
| | - Jun Li
- Department of Pharmaceutical Science, SUNY at Buffalo, Buffalo, New York 14228, United States
- Center of Excellence in Bioinformatics & Life Sciences, Buffalo, New York 14203, United States
| | - Qiang Hu
- Roswell Park Cancer Institute, Buffalo, New York 14263, United States
| | - Lei Nie
- Center of Excellence in Bioinformatics & Life Sciences, Buffalo, New York 14203, United States
- Shandong University, Shandong Sheng 250000, China
| | - Chengjian Tu
- Department of Pharmaceutical Science, SUNY at Buffalo, Buffalo, New York 14228, United States
- Center of Excellence in Bioinformatics & Life Sciences, Buffalo, New York 14203, United States
| | - Xue Wang
- Roswell Park Cancer Institute, Buffalo, New York 14263, United States
| | - Benjamin Orsburn
- ThermoFisher Scientific, Pittsburgh, Pennsylvania 15275, United States
| | - Jianmin Wang
- Roswell Park Cancer Institute, Buffalo, New York 14263, United States
| | - Jun Qu
- Department of Pharmaceutical Science, SUNY at Buffalo, Buffalo, New York 14228, United States
- Center of Excellence in Bioinformatics & Life Sciences, Buffalo, New York 14203, United States
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9
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Johnson CW, Abraham PE, Linger JG, Khanna P, Hettich RL, Beckham GT. Eliminating a global regulator of carbon catabolite repression enhances the conversion of aromatic lignin monomers to muconate in Pseudomonas putida KT2440. Metab Eng Commun 2017; 5:19-25. [PMID: 29188181 PMCID: PMC5699531 DOI: 10.1016/j.meteno.2017.05.002] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 04/28/2017] [Accepted: 05/30/2017] [Indexed: 01/02/2023] Open
Abstract
Carbon catabolite repression refers to the preference of microbes to metabolize certain growth substrates over others in response to a variety of regulatory mechanisms. Such preferences are important for the fitness of organisms in their natural environments, but may hinder their performance as domesticated microbial cell factories. In a Pseudomonas putida KT2440 strain engineered to convert lignin-derived aromatic monomers such as p-coumarate and ferulate to muconate, a precursor to bio-based nylon and other chemicals, metabolic intermediates including 4-hydroxybenzoate and vanillate accumulate and subsequently reduce productivity. We hypothesized that these metabolic bottlenecks may be, at least in part, the effect of carbon catabolite repression caused by glucose or acetate, more preferred substrates that must be provided to the strain for supplementary energy and cell growth. Using mass spectrometry-based proteomics, we have identified the 4-hydroxybenzoate hydroxylase, PobA, and the vanillate demethylase, VanAB, as targets of the Catabolite Repression Control (Crc) protein, a global regulator of carbon catabolite repression. By deleting the gene encoding Crc from this strain, the accumulation of 4-hydroxybenzoate and vanillate are reduced and, as a result, muconate production is enhanced. In cultures grown on glucose, the yield of muconate produced from p-coumarate after 36 h was increased nearly 70% with deletion of the gene encoding Crc (94.6 ± 0.6% vs. 56.0 ± 3.0% (mol/mol)) while the yield from ferulate after 72 h was more than doubled (28.3 ± 3.3% vs. 12.0 ± 2.3% (mol/mol)). The effect of eliminating Crc was similar in cultures grown on acetate, with the yield from p-coumarate just slightly higher in the Crc deletion strain after 24 h (47.7 ± 0.6% vs. 40.7 ± 3.6% (mol/mol)) and the yield from ferulate increased more than 60% after 72 h (16.9 ± 1.4% vs. 10.3 ± 0.1% (mol/mol)). These results are an example of the benefit that reducing carbon catabolite repression can have on conversion of complex feedstocks by microbial cell factories, a concept we posit could be broadly considered as a strategy in metabolic engineering for conversion of renewable feedstocks to value-added chemicals. Crc is a global regulator of carbon catabolite repression in pseudomonads. The gene encoding Crc was deleted from muconate a producing P. putida strain. Based on our proteomics data, expression of PobA and VanAB are regulated by Crc. Deleting Crc improved conversion to muconate in the presence of glucose or acetate. This may be a useful strategy toward developing pseudomonad cell factories.
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Affiliation(s)
- Christopher W Johnson
- National Bioenergy Center, National Renewable Energy Laboratory, Golden, CO 80401, United States
| | - Paul E Abraham
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Jeffrey G Linger
- National Bioenergy Center, National Renewable Energy Laboratory, Golden, CO 80401, United States
| | - Payal Khanna
- National Bioenergy Center, National Renewable Energy Laboratory, Golden, CO 80401, United States
| | - Robert L Hettich
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Gregg T Beckham
- National Bioenergy Center, National Renewable Energy Laboratory, Golden, CO 80401, United States
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10
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Goeminne LJE, Gevaert K, Clement L. Experimental design and data-analysis in label-free quantitative LC/MS proteomics: A tutorial with MSqRob. J Proteomics 2017; 171:23-36. [PMID: 28391044 DOI: 10.1016/j.jprot.2017.04.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 03/29/2017] [Accepted: 04/01/2017] [Indexed: 12/14/2022]
Abstract
Label-free shotgun proteomics is routinely used to assess proteomes. However, extracting relevant information from the massive amounts of generated data remains difficult. This tutorial provides a strong foundation on analysis of quantitative proteomics data. We provide key statistical concepts that help researchers to design proteomics experiments and we showcase how to analyze quantitative proteomics data using our recent free and open-source R package MSqRob, which was developed to implement the peptide-level robust ridge regression method for relative protein quantification described by Goeminne et al. MSqRob can handle virtually any experimental proteomics design and outputs proteins ordered by statistical significance. Moreover, its graphical user interface and interactive diagnostic plots provide easy inspection and also detection of anomalies in the data and flaws in the data analysis, allowing deeper assessment of the validity of results and a critical review of the experimental design. Our tutorial discusses interactive preprocessing, data analysis and visualization of label-free MS-based quantitative proteomics experiments with simple and more complex designs. We provide well-documented scripts to run analyses in bash mode on GitHub, enabling the integration of MSqRob in automated pipelines on cluster environments (https://github.com/statOmics/MSqRob). SIGNIFICANCE The concepts outlined in this tutorial aid in designing better experiments and analyzing the resulting data more appropriately. The two case studies using the MSqRob graphical user interface will contribute to a wider adaptation of advanced peptide-based models, resulting in higher quality data analysis workflows and more reproducible results in the proteomics community. We also provide well-documented scripts for experienced users that aim at automating MSqRob on cluster environments.
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Affiliation(s)
- Ludger J E Goeminne
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Belgium; VIB-UGent Center for Medical Biotechnology, VIB, Belgium; Department of Biochemistry, Ghent University, Belgium; Bioinformatics Institute Ghent, Ghent University, Belgium.
| | - Kris Gevaert
- VIB-UGent Center for Medical Biotechnology, VIB, Belgium; Department of Biochemistry, Ghent University, Belgium; Bioinformatics Institute Ghent, Ghent University, Belgium.
| | - Lieven Clement
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Belgium; Bioinformatics Institute Ghent, Ghent University, Belgium.
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11
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Tu C, Shen S, Sheng Q, Shyr Y, Qu J. A peptide-retrieval strategy enables significant improvement of quantitative performance without compromising confidence of identification. J Proteomics 2016; 152:276-282. [PMID: 27903464 DOI: 10.1016/j.jprot.2016.11.020] [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: 08/04/2016] [Revised: 11/21/2016] [Accepted: 11/24/2016] [Indexed: 11/27/2022]
Abstract
Reliable quantification of low-abundance proteins in complex proteomes is challenging largely owing to the limited number of spectra/peptides identified. In this study we developed a straightforward method to improve the quantitative accuracy and precision of proteins by strategically retrieving the less confident peptides that were previously filtered out using the standard target-decoy search strategy. The filtered-out MS/MS spectra matched to confidently-identified proteins were recovered, and the peptide-spectrum-match FDR were re-calculated and controlled at a confident level of FDR≤1%, while protein FDR maintained at ~1%. We evaluated the performance of this strategy in both spectral count- and ion current-based methods. >60% increase of total quantified spectra/peptides was respectively achieved for analyzing a spike-in sample set and a public dataset from CPTAC. Incorporating the peptide retrieval strategy significantly improved the quantitative accuracy and precision, especially for low-abundance proteins (e.g. one-hit proteins). Moreover, the capacity of confidently discovering significantly-altered proteins was also enhanced substantially, as demonstrated with two spike-in datasets. In summary, improved quantitative performance was achieved by this peptide recovery strategy without compromising confidence of protein identification, which can be readily implemented in a broad range of quantitative proteomics techniques including label-free or labeling approaches. SIGNIFICANCE We hypothesize that more quantifiable spectra and peptides in a protein, even including less confident peptides, could help reduce variations and improve protein quantification. Hence the peptide retrieval strategy was developed and evaluated in two spike-in sample sets with different LC-MS/MS variations using both MS1- and MS2-based quantitative approach. The list of confidently identified proteins using the standard target-decoy search strategy was fixed and more spectra/peptides with less confidence matched to confident proteins were retrieved. However, the total peptide-spectrum-match false discovery rate (PSM FDR) after retrieval analysis was still controlled at a confident level of FDR≤1%. As expected, the penalty for occasionally incorporating incorrect peptide identifications is negligible by comparison with the improvements in quantitative performance. More quantifiable peptides, lower missing value rate, better quantitative accuracy and precision were significantly achieved for the same protein identifications by this simple strategy. This strategy is theoretically applicable for any quantitative approaches in proteomics and thereby provides more quantitative information, especially on low-abundance proteins.
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Affiliation(s)
- Chengjian Tu
- Department of Pharmaceutical Sciences, State University of New York at Buffalo, 285 Kapoor Hall, Buffalo, NY 14260, United States; New York State Center of Excellence in Bioinformatics and Life Sciences, 701 Ellicott Street, Buffalo, NY 14203, United States.
| | - Shichen Shen
- Department of Pharmaceutical Sciences, State University of New York at Buffalo, 285 Kapoor Hall, Buffalo, NY 14260, United States; New York State Center of Excellence in Bioinformatics and Life Sciences, 701 Ellicott Street, Buffalo, NY 14203, United States
| | - Quanhu Sheng
- Center for Quantitative Sciences, Vanderbilt University School of Medicine, 2220 Pierce Avenue, Nashville, TN 37232, United States
| | - Yu Shyr
- Center for Quantitative Sciences, Vanderbilt University School of Medicine, 2220 Pierce Avenue, Nashville, TN 37232, United States
| | - Jun Qu
- Department of Pharmaceutical Sciences, State University of New York at Buffalo, 285 Kapoor Hall, Buffalo, NY 14260, United States; New York State Center of Excellence in Bioinformatics and Life Sciences, 701 Ellicott Street, Buffalo, NY 14203, United States.
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12
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Branson OE, Freitas MA. A multi-model statistical approach for proteomic spectral count quantitation. J Proteomics 2016; 144:23-32. [PMID: 27260494 DOI: 10.1016/j.jprot.2016.05.032] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 05/23/2016] [Accepted: 05/24/2016] [Indexed: 01/16/2023]
Abstract
UNLABELLED The rapid development of mass spectrometry (MS) technologies has solidified shotgun proteomics as the most powerful analytical platform for large-scale proteome interrogation. The ability to map and determine differential expression profiles of the entire proteome is the ultimate goal of shotgun proteomics. Label-free quantitation has proven to be a valid approach for discovery shotgun proteomics, especially when sample is limited. Label-free spectral count quantitation is an approach analogous to RNA sequencing whereby count data is used to determine differential expression. Here we show that statistical approaches developed to evaluate differential expression in RNA sequencing experiments can be applied to detect differential protein expression in label-free discovery proteomics. This approach, termed MultiSpec, utilizes open-source statistical platforms; namely edgeR, DESeq and baySeq, to statistically select protein candidates for further investigation. Furthermore, to remove bias associated with a single statistical approach a single ranked list of differentially expressed proteins is assembled by comparing edgeR and DESeq q-values directly with the false discovery rate (FDR) calculated by baySeq. This statistical approach is then extended when applied to spectral count data derived from multiple proteomic pipelines. The individual statistical results from multiple proteomic pipelines are integrated and cross-validated by means of collapsing protein groups. BIOLOGICAL SIGNIFICANCE Spectral count data from shotgun proteomics experiments is semi-quantitative and semi-random, yet a robust way to estimate protein concentration. Tag-count approaches are routinely used to analyze RNA sequencing data sets. This approach, termed MultiSpec, utilizes multiple tag-count based statistical tests to determine differential protein expression from spectral counts. The statistical results from these tag-count approaches are combined in order to reach a final MultiSpec q-value to re-rank protein candidates. This re-ranking procedure is completed to remove bias associated with a single approach in order to better understand the true proteomic differences driving the biology in question. The MultiSpec approach can be extended to multiple proteomic pipelines. In such an instance, MultiSpec statistical results are integrated by collapsing protein groups across proteomic pipelines to provide a single ranked list of differentially expressed proteins. This integration mechanism is seamlessly integrated with the statistical analysis and provides the means to cross-validate protein inferences from multiple proteomic pipelines.
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Affiliation(s)
- Owen E Branson
- The Ohio State Biochemistry Graduate Program, The Ohio State University, Columbus, OH, USA; Department of Molecular Virology, Immunology and Medical Genetics, The Ohio State University, Columbus, OH, USA; Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Michael A Freitas
- The Ohio State Biochemistry Graduate Program, The Ohio State University, Columbus, OH, USA; Department of Molecular Virology, Immunology and Medical Genetics, The Ohio State University, Columbus, OH, USA; Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA.
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13
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Blein-Nicolas M, Zivy M. Thousand and one ways to quantify and compare protein abundances in label-free bottom-up proteomics. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2016; 1864:883-95. [PMID: 26947242 DOI: 10.1016/j.bbapap.2016.02.019] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 01/21/2016] [Accepted: 02/24/2016] [Indexed: 11/18/2022]
Abstract
How to process and analyze MS data to quantify and statistically compare protein abundances in bottom-up proteomics has been an open debate for nearly fifteen years. Two main approaches are generally used: the first is based on spectral data generated during the process of identification (e.g. peptide counting, spectral counting), while the second makes use of extracted ion currents to quantify chromatographic peaks and infer protein abundances based on peptide quantification. These two approaches actually refer to multiple methods which have been developed during the last decade, but were submitted to deep evaluations only recently. In this paper, we compiled these different methods as exhaustively as possible. We also summarized the way they address the different problems raised by bottom-up protein quantification such as normalization, the presence of shared peptides, unequal peptide measurability and missing data. This article is part of a Special Issue entitled: Plant Proteomics--a bridge between fundamental processes and crop production, edited by Dr. Hans-Peter Mock.
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Affiliation(s)
- Mélisande Blein-Nicolas
- GQE-Le Moulon, INRA, Univ Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, F-91190 Gif-sur-Yvette, France
| | - Michel Zivy
- GQE-Le Moulon, INRA, Univ Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, F-91190 Gif-sur-Yvette, France.
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14
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Tabb DL, Wang X, Carr SA, Clauser KR, Mertins P, Chambers MC, Holman JD, Wang J, Zhang B, Zimmerman LJ, Chen X, Gunawardena HP, Davies SR, Ellis MJC, Li S, Townsend RR, Boja ES, Ketchum KA, Kinsinger CR, Mesri M, Rodriguez H, Liu T, Kim S, McDermott JE, Payne SH, Petyuk VA, Rodland KD, Smith RD, Yang F, Chan DW, Zhang B, Zhang H, Zhang Z, Zhou JY, Liebler DC. Reproducibility of Differential Proteomic Technologies in CPTAC Fractionated Xenografts. J Proteome Res 2015; 15:691-706. [PMID: 26653538 PMCID: PMC4779376 DOI: 10.1021/acs.jproteome.5b00859] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The NCI Clinical Proteomic Tumor Analysis Consortium (CPTAC) employed a pair of reference xenograft proteomes for initial platform validation and ongoing quality control of its data collection for The Cancer Genome Atlas (TCGA) tumors. These two xenografts, representing basal and luminal-B human breast cancer, were fractionated and analyzed on six mass spectrometers in a total of 46 replicates divided between iTRAQ and label-free technologies, spanning a total of 1095 LC-MS/MS experiments. These data represent a unique opportunity to evaluate the stability of proteomic differentiation by mass spectrometry over many months of time for individual instruments or across instruments running dissimilar workflows. We evaluated iTRAQ reporter ions, label-free spectral counts, and label-free extracted ion chromatograms as strategies for data interpretation (source code is available from http://homepages.uc.edu/~wang2x7/Research.htm ). From these assessments, we found that differential genes from a single replicate were confirmed by other replicates on the same instrument from 61 to 93% of the time. When comparing across different instruments and quantitative technologies, using multiple replicates, differential genes were reproduced by other data sets from 67 to 99% of the time. Projecting gene differences to biological pathways and networks increased the degree of similarity. These overlaps send an encouraging message about the maturity of technologies for proteomic differentiation.
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Affiliation(s)
| | - Xia Wang
- Department of Mathematical Sciences, University of Cincinnati , Cincinnati, Ohio 45221, United States
| | - Steven A Carr
- Proteomics Platform, Broad Institute of MIT and Harvard , Cambridge, Massachusetts 02142, United States
| | - Karl R Clauser
- Proteomics Platform, Broad Institute of MIT and Harvard , Cambridge, Massachusetts 02142, United States
| | - Philipp Mertins
- Proteomics Platform, Broad Institute of MIT and Harvard , Cambridge, Massachusetts 02142, United States
| | | | | | | | | | | | - Xian Chen
- Department of Biochemistry and Biophysics, University of North Carolina , Chapel Hill, North Carolina 27599, United States
| | - Harsha P Gunawardena
- Department of Biochemistry and Biophysics, University of North Carolina , Chapel Hill, North Carolina 27599, United States
| | - Sherri R Davies
- Department of Medicine, Washington University , St. Louis, Missouri 63110, United States
| | - Matthew J C Ellis
- Department of Medicine, Washington University , St. Louis, Missouri 63110, United States
| | - Shunqiang Li
- Department of Medicine, Washington University , St. Louis, Missouri 63110, United States
| | - R Reid Townsend
- Department of Medicine, Washington University , St. Louis, Missouri 63110, United States
| | - Emily S Boja
- Office of Cancer Clinical Proteomics Research, National Cancer Institute , Bethesda, Maryland 20892, United States
| | - Karen A Ketchum
- Enterprise Science and Computing, Inc. , Rockville, Maryland 20850, United States
| | - Christopher R Kinsinger
- Office of Cancer Clinical Proteomics Research, National Cancer Institute , Bethesda, Maryland 20892, United States
| | - Mehdi Mesri
- Office of Cancer Clinical Proteomics Research, National Cancer Institute , Bethesda, Maryland 20892, United States
| | - Henry Rodriguez
- Office of Cancer Clinical Proteomics Research, National Cancer Institute , Bethesda, Maryland 20892, United States
| | - Tao Liu
- Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Sangtae Kim
- Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Jason E McDermott
- Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Samuel H Payne
- Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Vladislav A Petyuk
- Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Karin D Rodland
- Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Richard D Smith
- Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Feng Yang
- Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, Washington 99352, United States
| | - Daniel W Chan
- JHMI and Division of Clinical Chemistry, Johns Hopkins University , Baltimore, Maryland 21231, United States
| | - Bai Zhang
- JHMI and Division of Clinical Chemistry, Johns Hopkins University , Baltimore, Maryland 21231, United States
| | - Hui Zhang
- JHMI and Division of Clinical Chemistry, Johns Hopkins University , Baltimore, Maryland 21231, United States
| | - Zhen Zhang
- JHMI and Division of Clinical Chemistry, Johns Hopkins University , Baltimore, Maryland 21231, United States
| | - Jian-Ying Zhou
- JHMI and Division of Clinical Chemistry, Johns Hopkins University , Baltimore, Maryland 21231, United States
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15
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Zhang Y, Wen Z, Washburn MP, Florens L. Improving label-free quantitative proteomics strategies by distributing shared peptides and stabilizing variance. Anal Chem 2015; 87:4749-56. [PMID: 25839423 DOI: 10.1021/ac504740p] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In a previous study, we demonstrated that spectral counts-based label-free proteomic quantitation could be improved by distributing peptides shared between multiple proteins. Here, we compare four quantitative proteomic approaches, namely, the normalized spectral abundance factor (NSAF), the normalized area abundance factor (NAAF), normalized parent ion intensity abundance factor (NIAF), and the normalized fragment ion intensity abundance factor (NFAF). We demonstrate that label-free proteomic quantitation methods based on chromatographic peak area (NAAF), parent ion intensity in MS1 (NIAF), and fragment ion intensity (NFAF) are also improved when shared peptides are distributed on the basis of peptides unique to each isoform. To stabilize the variance inherent to label-free proteomic quantitation data sets, we use cyclic-locally weighted scatter plot smoothing (LOWESS) and linear regression normalization (LRN). Again, all four methods are improved when cyclic-LOWESS and LRN are applied to reduce variation. Finally, we demonstrate that absolute quantitative values may be derived from label-free parameters such as spectral counts, chromatographic peak area, and ion intensity when using spiked-in proteins of known amounts to generate standard curves.
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Affiliation(s)
- Ying Zhang
- †Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, Missouri 64110, United States
| | - Zhihui Wen
- †Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, Missouri 64110, United States
| | - Michael P Washburn
- †Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, Missouri 64110, United States.,∥Department of Pathology and Laboratory Medicine, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, Kansas 66160, United States
| | - Laurence Florens
- †Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, Missouri 64110, United States
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16
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Dave KA, Norris EL, Bukreyev AA, Headlam MJ, Buchholz UJ, Singh T, Collins PL, Gorman JJ. A comprehensive proteomic view of responses of A549 type II alveolar epithelial cells to human respiratory syncytial virus infection. Mol Cell Proteomics 2014; 13:3250-69. [PMID: 25106423 PMCID: PMC4256481 DOI: 10.1074/mcp.m114.041129] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 07/16/2014] [Indexed: 11/06/2022] Open
Abstract
Human respiratory syncytial virus is a major respiratory pathogen for which there are no suitable antivirals or vaccines. A better understanding of the host cell response to this virus may redress this problem. The present report concerns analysis of multiple independent biological replicates of control and 24 h infected lysates of A549 cells by two different proteomic workflows. One workflow involved fractionation of lysates by in-solution protein IEF and individual fractions were digested using trypsin prior to capillary HPLC-LTQ-OrbitrapXL-MS/MS. A second workflow involved digestion of whole cell lysates and analysis by nanoUltraHPLC-LTQ-OrbitrapElite-MS/MS. Both workflows resulted in the quantification of viral proteins exclusively in lysates of infected cells in the relative abundances anticipated from previous studies. Unprecedented numbers (3247 - 5010) of host cell protein groups were also quantified and the infection-specific regulation of a large number (191) of these protein groups was evident based on a stringent false discovery rate cut-off (<1%). Bioinformatic analyses revealed that most of the regulated proteins were potentially regulated by type I, II, and III interferon, TNF-α and noncanonical NF-κB2 mediated antiviral response pathways. Regulation of specific protein groups by infection was validated by quantitative Western blotting and the cytokine-/key regulator-specific nature of their regulation was confirmed by comparable analyses of cytokine treated A549 cells. Overall, it is evident that the workflows described herein have produced the most comprehensive proteomic characterization of host cell responses to human respiratory syncytial virus published to date. These workflows will form the basis for analysis of the impacts of specific genes of human respiratory syncytial virus responses of A549 and other cell lines using a gene-deleted version of the virus. They should also prove valuable for the analysis of the impact of other infectious agents on host cells.
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Affiliation(s)
- Keyur A Dave
- From the ‡Protein Discovery Centre, QIMR Berghofer Medical Research Institute, Herston, Queensland, 4029 Australia and
| | - Emma L Norris
- From the ‡Protein Discovery Centre, QIMR Berghofer Medical Research Institute, Herston, Queensland, 4029 Australia and
| | - Alexander A Bukreyev
- §Respiratory Virus Section, Laboratory of Infectious Diseases, National Institute for Allergy and Infectious Diseases, NIH, Bethesda, Maryland 20892
| | - Madeleine J Headlam
- From the ‡Protein Discovery Centre, QIMR Berghofer Medical Research Institute, Herston, Queensland, 4029 Australia and
| | - Ursula J Buchholz
- §Respiratory Virus Section, Laboratory of Infectious Diseases, National Institute for Allergy and Infectious Diseases, NIH, Bethesda, Maryland 20892
| | - Toshna Singh
- From the ‡Protein Discovery Centre, QIMR Berghofer Medical Research Institute, Herston, Queensland, 4029 Australia and
| | - Peter L Collins
- §Respiratory Virus Section, Laboratory of Infectious Diseases, National Institute for Allergy and Infectious Diseases, NIH, Bethesda, Maryland 20892
| | - Jeffrey J Gorman
- From the ‡Protein Discovery Centre, QIMR Berghofer Medical Research Institute, Herston, Queensland, 4029 Australia and
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17
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Tu C, Li J, Sheng Q, Zhang M, Qu J. Systematic assessment of survey scan and MS2-based abundance strategies for label-free quantitative proteomics using high-resolution MS data. J Proteome Res 2014; 13:2069-79. [PMID: 24635752 PMCID: PMC3993956 DOI: 10.1021/pr401206m] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
![]()
Survey-scan-based label-free method
have shown no compelling benefit
over fragment ion (MS2)-based approaches when low-resolution mass
spectrometry (MS) was used, the growing prevalence of high-resolution
analyzers may have changed the game. This necessitates an updated,
comparative investigation of these approaches for data acquired by
high-resolution MS. Here, we compared survey scan-based (ion current,
IC) and MS2-based abundance features including spectral-count (SpC)
and MS2 total-ion-current (MS2-TIC), for quantitative analysis using
various high-resolution LC/MS data sets. Key discoveries include:
(i) study with seven different biological data sets revealed only
IC achieved high reproducibility for lower-abundance proteins; (ii)
evaluation with 5-replicate analyses of a yeast sample showed IC provided
much higher quantitative precision and lower missing data; (iii) IC,
SpC, and MS2-TIC all showed good quantitative linearity (R2 > 0.99) over a >1000-fold concentration range;
(iv)
both MS2-TIC and IC showed good linear response to various protein
loading amounts but not SpC; (v) quantification using a well-characterized
CPTAC data set showed that IC exhibited markedly higher quantitative
accuracy, higher sensitivity, and lower false-positives/false-negatives
than both SpC and MS2-TIC. Therefore, IC achieved an overall superior
performance than the MS2-based strategies in terms of reproducibility,
missing data, quantitative dynamic range, quantitative accuracy, and
biomarker discovery.
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Affiliation(s)
- Chengjian Tu
- Department of Pharmaceutical Sciences, University at Buffalo, State University of New York , Buffalo, NY 14260, United States
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