Workshop: SILAC and Alternative Labeling Strategies in Quantitative Proteomics
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1 Workshop: SILAC and Alternative Labeling Strategies in Quantitative Proteomics
2 SILAC and Stable Isotope Dimethyl-Labeling Approaches in Quantitative Proteomics Ho-Tak Lau, Hyong-Won Suh, Shao-En Ong UW Pharmacology March 30, 2015
3 Outline SILAC and Stable Isotope Dimethyl-Labeling, two methods for stable isotope-based quantitative proteomics Developing a StageTip Stable Isotope Dimethyl-Labeling protocol Comparing the two labeling methods Application: Dasatinib kinase inhibitor pulldown Application: Quantitative labeling of gel-separated samples 3
4 Stable isotopes to label proteomes Ong, SE and Mann, M Nat Protocols
5 SILAC Stable Isotope Labeling by Amino acids in Cell culture Ong SE et. al. Mol Cell Proteomics (2002) 5
6 Two- & Three-state SILAC Triple encoding SILAC Light Heavy Experiment Ong SE et. al. Mol Cell Proteomics (2002) Blagoev B., Ong SE et. al. Nat Biotech
7 Stable Isotope Dimethyl-Labeling Two-state labeling Hsu, JL et. al. Anal Chem 2003 Three-state labeling Boersma, P et. al. Nat Protocols
8 Features of these quantitative approaches SILAC Incorporating isotope labels in growth medium - Requires living cells for labeling Low cost + Allows measurement of synthesis and turnover in pulse labeling experiments + Samples can be combined early in the experimental design, at whole cells for organelle purification + PTMs do not affect labeling efficiency Stable Isotope Dimethyl-Labeling Chemical labeling of primary amines in peptides + Essentially complete labeling in one pot reaction Low cost + Not metabolic incorporation, can label tissue sample post-digestion - Samples have to be combined after separate enzymatic digest and post-labeling - Modified N-terminal peptides that are not terminated in Lys are not labeled and cannot be quantified. 8
9 Why compare SILAC and Dimethyl- Labeling? 1. Wanted to use chemical labeling, often looking at pairwise or three-state comparisons 2. Wanted an inexpensive chemical labeling alternative to commercial isobaric tags like itraq and TMT 3. Wanted to label large amounts of peptide (e.g. phosphoproteomics projects ~10 mg/condition) 4. Wanted to develop a robust chemical labeling protocol for use with gel-separated samples 9
10 Comparing SILAC, Dimethyl Labeling, TMT Precursor MS quantification (SILAC, Dimethyl-Labeling) Reporter ion MS2 quantification (TMT) Result Result Result Result Benchmarking stable isotope labeling based quantitative proteomics Altelaar et. al. J. Proteomics
11 Comparing SILAC, Dimethyl Labeling, TMT Benchmarking stable isotope labeling based quantitative proteomics Altelaar et. al. J. Proteomics
12 Comparing SILAC and mtraq Comparison of SILAC and mtraq Quantification for Phosphoproteomics on a Quadrupole Orbitrap Mass Spectrometer Oppermann et. al. JPR
13 Comparing SILAC and mtraq Comparison of SILAC and mtraq Quantification for Phosphoproteomics on a Quadrupole Orbitrap Mass Spectrometer Oppermann et. al. JPR
14 Comparing methods in single LC-MS runs One sample Lau, HT, Suh, HW et. al. JPR Da 14
15 Analytical setup Thermo Dionex RSLCNano UPLC and Autosampler Thermo Orbitrap Elite Self-pulled 360 µm OD x 75 µm ID column with ~10 µm tip Self-packed cm long, 3 µm C18-AQ Reprosil (Dr. Maisch) Source with column 55ºC ( Priska Von Haller PhD, UWPR) 200 nl/min flow, 90 min 3-35% acetonitrile ( 0.1% acetic acid) Varying sample complexity (Unfractionated, and affinity pulldowns) MaxQuant ver , searching the same data files with separate sets of search parameters (either SILAC or dimethyl-labeling), then combining result files in R for analysis 15
16 C18 StageTips peptide desalting Rappsilber J, Mann M, Ishihama Y Nature Protocols
17 StageTip dimethyl-labeling Boersma et. al described several dimethyl labeling protocols, including online column labeling, in-solution labeling, and C18 offline SPE cartridge labeling We wanted to miniaturize the labeling reaction to allow quantitative labeling of small amounts of peptide (1 to 15 µg peptide) C18 StageTips already used for desalting of peptide samples prior to LCMS Is offline dimethyl-labeling protocol compatible with StageTips? 17
18 StageTip dimethyl-labeling protocol works! StageTip dimethyl-labeling results in higher peptide intensities than in-solution labeling (14% higher) Longer, more hydrophobic peptides in StageTip labeling protocol 18
19 Dynamic range of SILAC & Dimethyl- Labeling Both precursor MS methods show same ratio compression Unfractionated whole cell lysates in 90 min LCMS runs 19
20 Precision and repeatability Overall precision, normalized peptide ratios Repeatability of protein ratios Precision: Intra-day variation (4 sets); Repeatability: Variation in replicates on different days (3 days) 20
21 Loss of hydrophilic peptides in Dimethyl-labeling? Unique peptides IDs Peptides unique in SILAC sample are more hydrophilic ~5% lower intensity in Dimethyllabeled vs. SILAC peptides ~23% fewer peptide IDs in Dimethyllabeled samples vs. SILAC 21
22 Identifying REAL binders in pulldowns Ong SE et. al. PNAS
23 Application to dasatinib pulldowns Coverage of known dasatinib targets Label swap replicates for each set 23
24 Scatter plots of dasatinib pulldown 24
25 Both methods identify known targets 25
26 SILAC (but not dimethyl labeling) identifies false positives in label-swap experiments 26
27 The end of gel bands Sample A: detected isotopic clusters Sample B: detected isotopic clusters 27
28 Can you reliably compare these samples? Sample A Sample B One gel slice, one LC run Sample A: 2349 identified peptides 402 proteins Sample B: 2453 identified peptides 425 proteins 28
29 Yes! With StageTip dimethyl-labeling 29
30 Conclusions Precision (intra-day replicates) and Repeatability (inter-day, biological replicates) are similar in SILAC and stable isotope dimethyl-labeling SILAC samples combined before trypsin digestion provide the highest level of reproducibility Label-swap SILAC experiments provide additional specificity to detect lysate-specific differences in pulldown experiments Developed a robust StageTip Stable Isotope Dimethyl- Labeling protocol for gel separated proteins 30
31 Acknowledgments ONG LAB Ho-Tak Lau Hyong-Won Danny Suh Martin Golkowski Emily Myers Funding NCI NIAMS NIBIB 31
32 Roundtable Discussion Stable Isotope Labeling Approaches in Proteomics: An Open Forum Panelists: Chris Colangelo, Yale Thomas Neubert, NYU Langone Shao-En Ong, UW Bret Phinney, UC Davis Brian Searle, Proteome Sciences
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