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Papala A, Sylvester M, Dyballa-Rukes N, Metzger S, D'Haese J. Isolation and characterization of human CapG expressed and post-translationally modified in Pichia pastoris. Protein Expr Purif 2017; 134:25-37. [DOI: 10.1016/j.pep.2017.03.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 02/08/2017] [Accepted: 03/18/2017] [Indexed: 12/13/2022]
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Ghio S, Insani EM, Piccinni FE, Talia PM, Grasso DH, Campos E. GH10 XynA is the main xylanase identified in the crude enzymatic extract of Paenibacillus sp. A59 when grown on xylan or lignocellulosic biomass. Microbiol Res 2016; 186-187:16-26. [DOI: 10.1016/j.micres.2016.02.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 02/23/2016] [Accepted: 02/29/2016] [Indexed: 12/15/2022]
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3
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Paulo JA, Kadiyala V, Gaun A, Sauld JFK, Ghoulidi A, Banks PA, Steen H, Conwell DL. Analysis of endoscopic pancreatic function test (ePFT)-collected pancreatic fluid proteins precipitated via ultracentrifugation. JOP : JOURNAL OF THE PANCREAS 2013; 14:176-86. [PMID: 23474565 DOI: 10.6092/1590-8577/1272] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Revised: 01/03/2013] [Accepted: 02/04/2013] [Indexed: 12/16/2022]
Abstract
CONTEXT We have shown previously that trichloroacetic acid precipitation is an effective method of protein extraction from pancreatic fluid for downstream biomarker discovery, compared to other common extraction methods tested. OBJECTIVE We aim to assess the utility of ultracentrifugation as an alternative method of protein extraction from pancreatic fluid. DESIGN Proteins extracted from trichloroacetic acid- and ultracentrifugation-precipitated pancreatic fluid were identified using mass spectrometry techniques (in-gel tryptic digestion followed by liquid chromatography-tandem mass spectrometry; GeLC-MS/MS). Data were analyzed using Proteome Discoverer and Scaffold 3. SETTING This is a proteomic analysis experiment of endoscopically collected fluid in an academic center. PATIENTS The study population included adult patients referred to the Center for Pancreatic Disease at Brigham and Women's Hospital, Boston, MA, USA for the evaluation of abdominal pain and gastrointestinal symptoms. INTERVENTIONS Secretin-stimulated pancreatic fluid was collected as standard of care for the evaluation of abdominal pain and gastrointestinal symptoms. MAIN OUTCOME MEASURES We compared proteins identified via standard trichloroacetic acid precipitation and this alternative ultracentrifugation strategy. RESULTS A subset of pancreatic fluid proteins was identified via the ultracentrifugation method. Of these proteins, similar numbers were obtained from fully tryptic or semi-tryptic database searching. Proteins identified in the ultracentrifugation-precipitated samples included previously identified biomarker candidates of chronic pancreatitis. CONCLUSIONS This alternative ultracentrifugation strategy requires less time and fewer handling procedures than standard trichloroacetic acid precipitation, at the expense of higher sample volume. As such, this method is well suited for targeted assays (i.e., dot blotting or targeted mass spectrometry) if the protein of interest is among those readily identified by ultracentrifugation-promoted precipitation.
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Affiliation(s)
- Joao A Paulo
- Department of Pathology, Children's Hospital Boston and Harvard Medical School, Boston, MA 02115, USA.
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4
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Carroll AJ. The Arabidopsis Cytosolic Ribosomal Proteome: From form to Function. FRONTIERS IN PLANT SCIENCE 2013; 4:32. [PMID: 23459595 PMCID: PMC3585428 DOI: 10.3389/fpls.2013.00032] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Accepted: 02/10/2013] [Indexed: 05/20/2023]
Abstract
The cytosolic ribosomal proteome of Arabidopsis thaliana has been studied intensively by a range of proteomics approaches and is now one of the most well characterized eukaryotic ribosomal proteomes. Plant cytosolic ribosomes are distinguished from other eukaryotic ribosomes by unique proteins, unique post-translational modifications and an abundance of ribosomal proteins for which multiple divergent paralogs are expressed and incorporated. Study of the A. thaliana ribosome has now progressed well beyond a simple cataloging of protein parts and is focused strongly on elucidating the functions of specific ribosomal proteins, their paralogous isoforms and covalent modifications. This review summarises current knowledge concerning the Arabidopsis cytosolic ribosomal proteome and highlights potentially fruitful areas of future research in this fast moving and important area.
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Affiliation(s)
- Adam J. Carroll
- Australian Research Council Centre of Excellence in Plant Energy Biology, Australian National UniversityCanberra, ACT, Australia
- *Correspondence: Adam J. Carroll, Australian Research Council Centre of Excellence in Plant Energy Biology, Australian National University, ACT 0200, Canberra, Australia. e-mail:
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Tabb DL. Quality assessment for clinical proteomics. Clin Biochem 2012; 46:411-20. [PMID: 23246537 DOI: 10.1016/j.clinbiochem.2012.12.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 12/01/2012] [Accepted: 12/03/2012] [Indexed: 12/21/2022]
Abstract
Proteomics has emerged from the labs of technologists to enter widespread application in clinical contexts. This transition, however, has been hindered by overstated early claims of accuracy, concerns about reproducibility, and the challenges of handling batch effects properly. New efforts have produced sets of performance metrics and measurements of variability that establish sound expectations for experiments in clinical proteomics. As researchers begin incorporating these metrics in a quality by design paradigm, the variability of individual steps in experimental pipelines will be reduced, regularizing overall outcomes. This review discusses the evolution of quality assessment in 2D gel electrophoresis, mass spectrometry-based proteomic profiling, tandem mass spectrometry-based protein inventories, and proteomic quantitation. Taken together, the advances in each of these technologies are establishing databases that will be increasingly useful for decision-making in clinical experimentation.
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Affiliation(s)
- David L Tabb
- Department of Biomedical Informatics, Vanderbilt University, USA.
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6
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Pinheiro A, Silva MJ, Graça I, Silva J, Sá R, Sousa M, Barros A, Tavares de Almeida I, Rivera I. Pyruvate dehydrogenase complex: mRNA and protein expression patterns of E1α subunit genes in human spermatogenesis. Gene 2012; 506:173-8. [PMID: 22750801 DOI: 10.1016/j.gene.2012.06.068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Accepted: 06/20/2012] [Indexed: 12/24/2022]
Abstract
During spermatogenesis, germ cells undergo a complex process of cell differentiation and morphological restructuring, which depends on the coordinated expression of different genes. Some vital examples are those involved in cell energy metabolism, namely the genes encoding the E1α subunit of pyruvate dehydrogenase complex: the somatic PDHA1 (X-linked) and the testis-specific PDHA2 (autosomal). There are no data related to the study at the RNA and protein levels of PDHA genes during human spermatogenesis. The present study aimed to describe the mRNA and protein expression patterns of the human PDHA genes during spermatogenesis. Expression profiles of the PDHA1 and PDHA2 genes were characterized using different human tissues and cells. Diploid and haploid germ cells fractions were obtained from testis tissues. The mRNA profiles were analyzed by quantitative RT-PCR, whereas the protein profiles were evaluated by immunohistochemistry, western blotting and two-dimensional electrophoresis. Expression of the PDHA1 gene was found in all somatic cells, whereas expression of PDHA2 gene was restricted to germ cells. The switch from X-linked to autosomic gene expression occurred in spermatocytes. Data suggest the activation of PDHA2 gene expression is most probably a mechanism to ensure the continued expression of the protein, thus allowing germ cell viability and functionality.
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Affiliation(s)
- Ana Pinheiro
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Portugal
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Paulo JA, Lee LS, Wu B, Banks PA, Steen H, Conwell DL. Mass spectrometry-based proteomics of endoscopically collected pancreatic fluid in chronic pancreatitis research. Proteomics Clin Appl 2011; 5:109-20. [PMID: 21360826 DOI: 10.1002/prca.201000098] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 01/16/2011] [Accepted: 01/18/2011] [Indexed: 12/14/2022]
Abstract
MS-based investigation of pancreatic fluid enables the high-throughput identification of proteins present in the pancreatic secretome. Pancreatic fluid is a complex admixture of digestive, inflammatory, and other proteins secreted by the pancreas into the duodenum, and thus is amenable to MS-based proteomic analysis. Recent advances in endoscopic techniques, in particular the endoscopic pancreatic function test (ePFT), have improved the collection methodology of pancreatic fluid for proteomic analysis. Here, we provide an overview of MS-based proteomic techniques as applied to the study of pancreatic fluid. We address sample collection, protein extraction, MS sample preparation and analysis, and bioinformatic approaches, and summarize current MS-based investigations of pancreatic fluid. We then examine the limitations and the future potential of such technologies in the investigation of pancreatic disease. We conclude that pancreatic fluid represents a rich reservoir of potential biomarkers and that the study of the molecular mechanisms of chronic pancreatitis may benefit substantially from MS-based proteomics.
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Affiliation(s)
- Joao A Paulo
- Center for Pancreatic Disease, Division of Gastroenterology, Hepatology and Endoscopy, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
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Robinson AA, Westbrook JA, English JA, Borén M, Dunn MJ. Assessing the use of thermal treatment to preserve the intact proteomes of post-mortem heart and brain tissue. Proteomics 2009; 9:4433-44. [PMID: 19688732 DOI: 10.1002/pmic.200900287] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Protein degradation that occurs in tissue during post-mortem interval or sample preparation is problematic in quantitative analyses as confounding variables may arise. Ideally, such artefacts should be prevented by preserving the native proteome during sample preparation. We assessed the efficacy of thermal treatment (TT) to preserve the intact proteome of mouse heart and brain tissue in comparison to standard snap-freezing with liquid nitrogen (LN). Tissue samples were collected, either snap frozen (LN), subjected to TT, or snap frozen followed by thermal treatment, and subsequently analysed by 2-DE. In heart tissue, following quantitative image analysis, we observed 77 proteins that were significantly altered across the three treatment groups (ANOVA, p<0.05). Principal component and clustering analyses revealed LN and TT to be equally beneficial. These findings were confirmed by MS identification of the significantly altered proteins. In brain tissue, 189 proteins were significantly differentially expressed across the three treatment groups (ANOVA, p<0.05). Brain tissue appeared to be more responsive to TT than heart and distinct clusters of differentially expressed proteins were observed across treatments. Overall, TT of brain tissue appears to have beneficial effects on protein stabilisation during sample preparation with preservation of high-molecular-weight proteins and reduction in protein fragmentation.
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Affiliation(s)
- Aisling A Robinson
- UCD Conway Institute of Biomolecular and Biomedical Research, School of Medicine and Medical Science, University College Dublin, Dublin 4, Ireland.
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9
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Yang F, Jensen JD, Spliid NH, Svensson B, Jacobsen S, Jørgensen LN, Jørgensen HJL, Collinge DB, Finnie C. Investigation of the effect of nitrogen on severity of Fusarium head blight in barley. J Proteomics 2009; 73:743-52. [PMID: 19895910 DOI: 10.1016/j.jprot.2009.10.010] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2009] [Revised: 10/22/2009] [Accepted: 10/23/2009] [Indexed: 10/20/2022]
Abstract
The effect of nitrogen on Fusarium Head Blight (FHB) in a susceptible barley cultivar was investigated using gel-based proteomics. Barley grown with either 15 or 100kgha(-1)N fertilizer was inoculated with Fusarium graminearum (Fg). The storage protein fraction did not change significantly in response either to N level or Fg, whereas eighty protein spots in the water-soluble albumin fraction increased and 108 spots decreased more than two-fold in intensity in response to Fg. Spots with greater intensity in infected plants contained fungal proteins (9 spots) and proteolytic fragments of plant proteins (65 spots). Identified fungal proteins included two superoxide dismutases, L-xylulose reductase in two spots, peptidyl prolyl cis-trans isomerase and triosephosphate isomerase, and proteins of unknown function. Spots decreasing in intensity in response to Fg contained plant proteins possibly degraded by fungal proteases. Greater spot volume changes occurred in response to Fg in plants grown with low nitrogen, although proteomes of uninfected plants were similar for both treatments. Correlation of proteome changes with measurement of Fusarium-damaged kernels, fungal biomass and mycotoxin levels indicated that increased Fusarium infection occurred in barley with low N and suggests control of N fertilization as a possible way to minimise FHB in barley.
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Affiliation(s)
- Fen Yang
- Enzyme and Protein Chemistry, Department of Systems Biology, Technical University of Denmark, Denmark
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Ahmed FE. Sample preparation and fractionation for proteome analysis and cancer biomarker discovery by mass spectrometry. J Sep Sci 2009; 32:771-98. [PMID: 19219839 DOI: 10.1002/jssc.200800622] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Sample preparation and fractionation technologies are one of the most crucial processes in proteomic analysis and biomarker discovery in solubilized samples. Chromatographic or electrophoretic proteomic technologies are also available for separation of cellular protein components. There are, however, considerable limitations in currently available proteomic technologies as none of them allows for the analysis of the entire proteome in a simple step because of the large number of peptides, and because of the wide concentration dynamic range of the proteome in clinical blood samples. The results of any undertaken experiment depend on the condition of the starting material. Therefore, proper experimental design and pertinent sample preparation is essential to obtain meaningful results, particularly in comparative clinical proteomics in which one is looking for minor differences between experimental (diseased) and control (nondiseased) samples. This review discusses problems associated with general and specialized strategies of sample preparation and fractionation, dealing with samples that are solution or suspension, in a frozen tissue state, or formalin-preserved tissue archival samples, and illustrates how sample processing might influence detection with mass spectrometric techniques. Strategies that dramatically improve the potential for cancer biomarker discovery in minimally invasive, blood-collected human samples are also presented.
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Affiliation(s)
- Farid E Ahmed
- Department of Radiation Oncology, Leo W. Jenkins Cancer Center, The Brody School of Medicine at East Carolina University, Greenville, NC, USA.
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Marklová E, Albahri Z. Transferrin D protein variants in the diagnosis of congenital disorders of glycosylation (CDG). J Clin Lab Anal 2009; 23:77-81. [PMID: 19288450 DOI: 10.1002/jcla.20293] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Congenital disorders of glycosylation are a rapidly growing group of inherited (neuro)metabolic disorders characterized by defects in glycosylation of proteins and lipids. This study discusses an analytical problem in the differentiation between hypoglycosylation and transferrin (Tf) protein variants. Analysis of serum Tf by isoelectric focusing is used as a common method suitable for screening 19 out of a total of 22 types of glycosylation defects identified so far. In three members of a family, several indicators showed evidence of a Tf protein variant, however, routine neuraminidase-based demonstration failed to confirm this result. On the assumption that we should be able to exclude Tf protein variants at the screening-level of the diagnostic algorithm, our concern is a possible cause of our failure to confirm some of the Tf D variants (in contrast to the other C, B and D allelic combinations that are commonly well identified). Several explanations are discussed.
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Affiliation(s)
- Eliska Marklová
- Department of Pediatrics, University Hospital, Sokolská 581, Hradec Králové, Czech Republic.
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Han MJ, Yun H, Lee SY. Microbial small heat shock proteins and their use in biotechnology. Biotechnol Adv 2008; 26:591-609. [PMID: 18789382 DOI: 10.1016/j.biotechadv.2008.08.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2008] [Revised: 08/01/2008] [Accepted: 08/03/2008] [Indexed: 11/29/2022]
Abstract
Small heat shock proteins (sHsps) exist in almost all organisms. Most organisms have more than one sHsp, but their number can be as high as 65, as found in the eukaryote, Vitis vinifera. The function of sHsps is well-known; they confer thermotolerance to cellular cultures and proteins in cellular extracts during prolonged incubations at elevated temperatures. This demonstrates the ability of sHsps to protect cellular proteins, and to maintain cellular viability under conditions of intensive stress, such as heat shock or chemical treatments. sHsps have several properties that distinguish them from heat shock proteins (Hsps): they function as ATP-independent chaperones, require the flexible assembly and reassembly of oligomeric complex structures for their activation, and exhibit a wide range of substrate-binding capacities. Recent studies indicate that sHsps have important biological functions in thermostability, disaggregation, and proteolysis inhibition. These functions can be harnessed for various applications, including nanobiotechnology, proteomics, bioproduction, and bioseparation. In this review, we discuss the properties and diversity of microbial sHsps, as well as their potential uses in the biotechnology industry.
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Affiliation(s)
- Mee-Jung Han
- Metabolic and Biomolecular Engineering National Research Laboratory, Department of Chemical & Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon 305-701, Republic of Korea
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Bak-Jensen KS, Laugesen S, Ostergaard O, Finnie C, Roepstorff P, Svensson B. Spatio-temporal profiling and degradation of α-amylase isozymes during barley seed germination. FEBS J 2007; 274:2552-65. [PMID: 17437525 DOI: 10.1111/j.1742-4658.2007.05790.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ten genes from two multigene families encode barley alpha-amylases. To gain insight into the occurrence and fate of individual isoforms during seed germination, the alpha-amylase repertoire was mapped by using a proteomics approach consisting of 2D gel electrophoresis, western blotting, and mass spectrometry. Mass spectrometric analysis confirmed that the 29 alpha-amylase positive 2D gel spots contained products of one (GenBank accession gi|113765) and two (gi|4699831 and gi|166985) genes encoding alpha-amylase 1 and 2, respectively, but lacked products from seven other genes. Eleven spots were identified only by immunostaining. Mass spectrometry identified 12 full-length forms and 12 fragments from the cultivar Barke. Products of both alpha-amylase 2 entries co-migrated in five full-length and one fragment spot. The alpha-amylase abundance and the number of fragments increased during germination. Assessing the fragment minimum chain length by peptide mass fingerprinting suggested that alpha-amylase 2 (gi|4699831) initially was cleaved just prior to domain B that protrudes from the (betaalpha)(8)-barrel between beta-strand 3 and alpha-helix 3, followed by cleavage on the C-terminal side of domain B and near the C-terminus. Only two shorter fragments were identified of the other alpha-amylase 2 (gi|166985). The 2D gels of dissected tissues showed alpha-amylase degradation to be confined to endosperm. In contrast, the aleurone layer contained essentially only full-length alpha-amylase forms. While only products of the above three genes appeared by germination also of 15 other barley cultivars, the cultivars had distinct repertoires of charge and molecular mass variant forms. These patterns appeared not to be correlated with malt quality.
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Bodzon-Kulakowska A, Bierczynska-Krzysik A, Dylag T, Drabik A, Suder P, Noga M, Jarzebinska J, Silberring J. Methods for samples preparation in proteomic research. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 849:1-31. [PMID: 17113834 DOI: 10.1016/j.jchromb.2006.10.040] [Citation(s) in RCA: 176] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2006] [Accepted: 10/23/2006] [Indexed: 01/04/2023]
Abstract
Sample preparation is one of the most crucial processes in proteomics research. The results of the experiment depend on the condition of the starting material. Therefore, the proper experimental model and careful sample preparation is vital to obtain significant and trustworthy results, particularly in comparative proteomics, where we are usually looking for minor differences between experimental-, and control samples. In this review we discuss problems associated with general strategies of samples preparation, and experimental demands for these processes.
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Affiliation(s)
- Anna Bodzon-Kulakowska
- Department of Neurobiochemistry, Faculty of Chemistry, Jagiellonian University, Ingardena St. 3, 30-060 Krakow, Poland
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Han MJ, Lee JW, Lee SY. Enhanced Proteome Profiling by Inhibiting Proteolysis with Small Heat Shock Proteins. J Proteome Res 2005; 4:2429-34. [PMID: 16335997 DOI: 10.1021/pr050259m] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Proteolytic degradation is one of the critical problems in two-dimensional electrophoresis (2-DE). Here we report that small heat shock proteins (sHsps), including IbpA(Ec) and IbpB(Ec) from Escherichia coli and Hsp26(Sc) from Saccharomyces cerevisiae, are able to protect proteins in vitro from proteolytic degradation. Addition of sHsps during 2-DE of human serum or whole cell extracts of E. coli, Mannheimia succinciproducens, Arabidopsis thaliana, and human kidney cells allowed detection of up to 50% more protein spots than those obtainable with currently available protease inhibitors. Therefore, the use of sHsps during 2-DE significantly improves proteome profiling by generally enabling the detection of many more protein spots that could not be seen previously.
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Affiliation(s)
- Mee-Jung Han
- Metabolic and Biomolecular Engineering National Research Laboratory, Department of Chemical & Biomolecular Engineering, BioProcess Engineering Research Center, Daejeon, Republic of Korea
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