Proteomics. Areas of Application for Proteomics Most Commonly Used Proteomics Techniques: Limitations: Examples
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1 Proteomics Areas of Application for Proteomics Most Commonly Used Proteomics Techniques: Antibody arrays Protein activity arrays 2-D gels ICAT technology SELDI Limitations: protein sources surfaces and formats protein immobilization fabrication Examples
2 Diagnostics: Areas of Application for Proteomics detection of antigens and antibodies in blood samples profiling of sera to discover new disease markers environment and food monitoring Protein expression profiling: organ and disease specific arrays Library screening: isolation of individual members from display libraries for further expression or manipulation selection of antibodies and protein scaffolds from phage or ribosome display libraries for use in capture arrays Protein functional analysis: ligand-binding properties of receptors enzyme activities protein-protein interactions antibody cross reactivity and specificity, epitope mapping Antibody Arrays Screening protein-protein interactions Studying protein posttranslational modifications Examining protein expression patterns Antibody Arrays The layout design of the BD Clontech Ab Microarray 380. The BD Clontech Ab Microarray 380 (#K1847-1) contains 378 monoclonal antibodies arrayed in a 32 x 24 grid. Each antibody is printed in duplicate. Dark gray dots at the corners represent Cy3/Cy5-labeled bovine serum albumin (BSA) spots, which serve as orientation markers. The open circles correspond to unlabeled BSA spots, which serve as negative controls. For complete descriptions of the proteins profiled by the Ab Microarray 380, visit bdbiosciences.com
3 Protein Activity Arrays Panomics Transcription Factor Arrays: A set of biotin-labeled DNA binding oligonucleotides (TranSignal probe mix) is preincubated with any nuclear extract of interest to allow the formation of protein/dna (or TF/DNA) complexes; The protein/dna complexes are separated from the free probes; The probes in the complexes are then extracted and hybridized to the TranSignal Array. Signals can be detected using either x-ray film or chemiluminescent imaging. All reagents for HRPbased chemiluminescent detection are included. Source: Panomics, Inc. Protein Activity Arrays Gel Shift Assay Protein Array Source: Panomics, Inc. Limitations, Challenges and Bottlenecks Protein production: cell-based expression systems for recombinant proteins purification from natural sources production in vitro by cell-free translation systems synthetic methods for peptides Immobilization surfaces and array formats: Common physical supports include glass slides, silicon, microwells, nitrocellulose or PVDF membranes, microbeads Protein immobilization should be: reproducible applicable to proteins of different properties (size, charge, ) amenable to high throughput and automation, and compatible with retention of fully functional protein activity such that maintains correct protein orientation Array fabrication: robotic contact printing ink-jetting piezoelectric spotting photolithography
4 2D Gel Electrophoresis + Mass Spectrometry 2D Gel Electrophoresis Protein Resolution Bandara & Kennedy (2002) 2D Gel Electrophoresis Protein Resolution Courtesy of Bio-Rad Courtesy of Bio-Rad Courtesy of Fermentas
5 2D Gel Electrophoresis Image Analysis Courtesy of Decodon Courtesy of Alphainnotech Bandara & Kennedy (2002) 2D Gel Electrophoresis Mass Spectrometry Source: UNC Proteomics Core Facility
6 Image courtesy of University of Arizona Proteomics Core SEQUEST is a program that uses raw peptide MS/MS data (off TSQ-7000 or LCQ) to identify unknown proteins. It works by searching protein and nucleotide databases (in FASTA format) on the web for peptides that match the molecular weight of the unknown peptides produced by digestion of your protein(s) of interest. Theoretical MS/MS spectra are then generated and a score is given to each one. The top 500 scored theoretical peptides are retained and a cross correlation analysis is then performed between the un-interpreted MS/MS spectra (real MS/MS spectra) of unknown peptides with each of the retained theoretical MS/MS spectra. Highly correlated spectra result in identification of the peptide sequences and multiple peptide identification and thus determine the protein and organism of origin corresponding to the unknown protein sample. Isotope Coded Affinity Tag (ICAT) Analysis Bandara & Kennedy (2002)
7 Perticoin et al., Toxicologic Pathology, 32(Suppl. 1): , 2004 SELDI Analysis Representative raw spectra and gel-view (grey-scale) of serum from a normal donor, and from patients with either BPH (benign prostate hyperplasia) or prostate cancer (PCA) using the IMAC3-Cu chip chemistry From: Courtesy CIPHERGEN The upregulated 11.9 kda biomarker from the TMPD-treated rats was searched via Tagldent (SWISS-PROT), yielding a tentative identity as parvalbumin-alpha. This candidate was subsequently purified, peptide mapped and searched to confirm the identity. Parvalbumin is involved in muscle homeostasis.
8 Limitations, Challenges and Bottlenecks Resolution: number of proteins that can be separated/distinguished (500,000?!?) pi resolution mass resolution (gels and mass spectrometry) Amount of the protein in the sample: too little to be seen on a 2D gel? too little to be extracted and digested? Protein solubility Database searching and peptide identification Bandara & Kennedy (2002) Schneider LV, Hall MP. Drug Discov Today :
9 Two-dimensional electrophoretic analysis of rat liver total proteins. The proteins were separated on a ph 3 10 nonlinear IPG strip (left), or ph 4-7 IPG strip (right), followed by a 10% SDS polyacrylamide gel. The gel was stained with Coomassie blue. The spots were analyzed by MALDI-MS. The proteins identified are designated with the accession numbers of the corresponding database. From Fountoulakis & Suter (2002) Two-dimensional electrophoretic analysis of rat liver cytosolic proteins. The proteins were separated on a ph 3 10 nonlinear IPG strip (left), or ph 5 6 IPG strip (right), followed by a 10% SDS polyacrylamide gel. The spots were analyzed by MALDI-MS. The proteins identified are designated with the accession numbers of the corresponding database. From Fountoulakis & Suter (2002) Summary of the 2-D gel electrophoresis data In total, 273 different gene products were identified from all gels: 65 gene products were only detected in the gels carrying total 52 in the gels carrying cytosolic remaining proteins were found in both samples 45 proteins out of the 62 found in the gels carrying total protein samples were detected in the broad ph range 3 10 gel, 11 in the narrow ph range and nine in both types of gels 52 proteins only detected in the gels carrying the cytosolic fraction, except for 6 which were found in the broad ph range 3 10 gel, were found in one of the narrow ph range gels only (narrow ph range strips helped to detect 46 proteins not found in the broad range gels) Protein distribution was based on the protein identification by mass spectrometry and may not be complete due to: spot loss during automatic excision peptide loss mainly from weak spots spot overlapping small protein size About 5000 spots were excised from 13 2-D gels, 5 carrying total and 8 carrying cytosolic proteins. The analysis resulted in the identification of about 3000 proteins, which were the products of 273 different genes From Fountoulakis & Suter (2002)
10 Summary of the 2-D gel electrophoresis data From Fountoulakis & Suter (2002) Animals: Male Wistar rats (10 12 weeks, bw: 225±8 g) Treatment: Bromobenzene (i.p., 5.0 mmol/kg bw) dissolved in corn oil (40% v/v) Duration of treatment: 24 hrs The bromobenzene dose was hepatotoxic, and this was confirmed by the finding of a nearly complete glutathione depletion at 24 hr after bromobenzene administration. The low level of oxidised (GSSG) relative to reduced glutathione (GSH) indicates that the depletion is primarily due to conjugation and to a much lesser extent due to oxidation of glutathione. The bromobenzene administration resulted in on average 7% decrease in body weight after 24 hr. From: Heijne et al. (2003)
11 Gene Expression Profiling Liver samples, total RNA (50 µg/array experiment) cdna microarrays (3000 genes) Reference sample: pooled RNA from liver (~50% w/w), kidneys, lungs, brain, thymus, testes, spleen, heart, and muscle of untreated Wistar rats Duplicated microarray/sample 2-Fold cutoff (p<0.01) relative to the vehicle control: 32 genes were found to be significantly upregulated and 17 were repressed following bromobenzene treatment 1.5-Fold cutoff (p<0.01) relative to the vehicle control: 63 genes were found to be significantly upregulated and 35 genes were repressed following bromobenzene treatment Functional groups: Drug metabolism Glutathione metabolism Oxidative stress Acute phase response Protein synthesis Protein degradation Others From: Heijne et al. (2003) Glutathione metabolism: Oxidative stress: From: Heijne et al. (2003) Acute phase response: From: Heijne et al. (2003) 11
12 Protein Expression Profiling 3 two-dimensional gels were prepared from each sample A reference protein pattern contained 1124 protein spots 24 proteins were differentially expressed (BB or Corn oil) From: Heijne et al. (2003)
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