Activity‐Based Protein Profiling (ABPP) and Click Chemistry (CC)–ABPP by MudPIT Mass Spectrometry
1The Skaggs Institute for Chemical Biology and Department of Physiological Chemistry, The Scripps Research Institute, La Jolla, California
Abstract
Activity-based protein profiling (ABPP) is a chemical proteomic method for functional interrogation of enzymes within complex proteomes. This unit presents a protocol for in vitro and in vivo labeling using ABPP and Click Chemistry (CC)-ABPP probes for in-depth profiling using the Multi-dimensional Protein Identification Technology (MudPIT) analysis platform. Curr. Protoc. Chem Biol. 1:29-41. © 2009 by John Wiley & Sons, Inc.
Keywords: activity-based protein profiling; ABPP; click chemistry; mass spectrometry; MudPIT; activity-based probes; biotin; alkyne; azide
Table of Contents
- Introduction
- Basic Protocol 1: Labeling Enzymes In Vitro by ABPP
- Alternate Protocol: Labeling Enzymes in Living Cells or Mice by Click ChemistryActivity-Based Protein Profiling (CC-ABPP)
- Support Protocol 1: Preparation of Cells/Tissue Homogenates
- Support Protocol 2: Methanol/Chloroform Precipitation of Proteins
- Basic Protocol 2: Enrichment and Digestion of Probe-Labeled Proteins for MudPIT Analysis
- Reagents and Solutions
- Commentary
- Literature Cited
- Figures
- Topics
- Chemical Biology
- Intermolecular Interactions
- Molecular Biology
- Proteomics
Materials
Basic Protocol 1: Labeling Enzymes In Vitro by ABPP
- 1 mg protein/ml proteome source (e.g., cell or tissue homogenate; see Support Protocol 1)
- 100× (0.5 to 2 mM) biotinylated ABPP probe stock in dimethylsulfoxide (DMSO) (for details of synthesis, see Evans and Cravatt, 2006; Cravatt et al., 2008; and Paulick and Bogyo, 2008; store up to several years at 20° or 80°C)
- Dimethylsulfoxide (DMSO)
- 10% (v/v) Triton X-100 (store up to several months at room temperature)
- 50 mM Tris×Cl, pH 8.0 (store up to several months at 4°C)
- 10% (w/v) SDS in water
- End-over-end rotator
- 10DG disposable chromatography columns (BioRad)
- 15-ml conical centrifuge tubes
- 90°C heating block
Alternate Protocol: Labeling Enzymes in Living Cells or Mice by Click ChemistryActivity-Based Protein Profiling (CC-ABPP)
- Cells growing in culture in 15-cm plates or laboratory mice
- 1000× (5 to 25 mM) probe-alkyne stock in DMSO (for details of synthesis, see Evans and Cravatt, 2006; Cravatt et al., 2008; and Paulick and Bogyo, 2008; store up to several years at 20°C), for cell culture experiment
- 1× Dulbecco's phosphate-buffered saline (D-PBS; Invitrogen; without calcium and magnesium)
- 1 to 5 mg/ml probe-alkyne in vehicle (see recipe)
- Vehicle
- 5 mM biotin-azide (PEG4 carboxamide-6-azidohexanyl biotin; Invitrogen) in DMSO (store up to several years at 20°C)
- 50 mM tris(2-carboxyethyl)phosphine hydrochloride (TCEP; Fluka) in H
2 O (prepare fresh prior to use) - 1.7 mM TBTA (see recipe)
- 50 mM CuSO
4 ×5H2 O in H2 O (store up to several months at room temperature; remake if precipitate forms) - Methanol, cold
- 2.5% (w/v) SDS in Ca- and Mg-free D-PBS (store up to several months at room temperature)
- Cell scraper
- Refrigerated centrifuge
- Animal balance
- Probe sonicator
- 60°C water bath or heating block
- Additional reagents and equipment for preparing cell/tissue homogenates (Support Protocol 1) and methanol:chloroform precipitation (Support Protocol 2)
Support Protocol 1: Preparation of Cells/Tissue Homogenates
- Harvested cells/tissue
- 1× Dulbecco's phosphate-buffered saline (D-PBS; Invitrogen; without calcium and magnesium)
- Protein assay kit: e.g., DC protein assay (BioRad)
- Razor blade
- Glass plate or large tissue culture dish
- Dounce homogenizer
- Probe sonicator
- Refrigerated centrifuge
- Ultracentrifuge
- Insulin syringe
Support Protocol 2: Methanol/Chloroform Precipitation of Proteins
- Methanol
- Chloroform
- 15-ml conical centrifuge tubes
- Refrigerated centrifuge
Basic Protocol 2: Enrichment and Digestion of Probe-Labeled Proteins for MudPIT Analysis
- SDS-solubilized protein sample (Basic Protocol 1 or the Alternate Protocol)
- 1× Dulbecco's phosphate-buffered saline (D-PBS; Invitrogen; without calcium and magnesium)
- Streptavidin beads: 50% (v/v) slurry of Immunopure immobilized streptavidin (Pierce)
- 1% (w/v) SDS in Ca- and Mg-free D-PBS (store up to several months at room temperature)
- 6 M and 2 M urea in Ca- and Mg-free D-PBS (prepare fresh prior to use)
- 200 mM dithiothreitol (DTT) in H
2 O (prepare fresh daily, or store aliquots at 20°C for months) - 500 mM iodoacetamide (IAA) in H
2 O (prepare fresh daily, or store aliquots at 20°C for months) - 100 mM CaCl
2 in H2 O (store at room temperature for months) - 0.5 mg/ml sequence-grade modified trypsin (Promega) supplied in resuspension buffer
- 90% formic acid
- 50% (v/v) acetonitrile/0.1% trifluoroacetic acid (TFA) in H
2 O (prepare fresh prior to use) - 5% (v/v) formic acid (FA) in H
2 O
- Empty Micro Bio-Spin Chromatography Columns (BioRad, cat. no. 732-6204)
- End-over-end rotator
- Low-adhesion screw-top microcentrifuge tubes (Sarstedt)
- Gel-loading pipet tips
- 65°C water bath or heat block
- SpeedVac evaporator
Figures
-
Figure 1.The ABPP-MudPIT method for high-content proteomic analysis of enzyme activities. A proteome is labeled with a biotinylated ABPP probe, and labeled proteins are affinity enriched on streptavidin beads. After on-bead trypsin digest, the tryptic peptides are analyzed by MudPIT for identification and quantification (e.g., via spectra counting). Box: The probe-labeled peptides can also be eluted from the streptavidin beads for MS analysis of labeling sites.
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