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Relative quantification of proteasome activity by activity-based protein profiling and LC-MS/MS

Abstract

Activity-based protein profiling (ABPP) is a functional proteomics technique for directly monitoring the expression of active enzymes in cell extracts and living cells. The technique relies on irreversible inhibitors equipped with reactive groups (warheads) that covalently attach to the active site of enzymes and fluorescent or affinity tags for imaging and purification purposes, respectively. Here, a high-throughput and robust protocol for high-resolution quantitative activity-based proteasome profiling is described. We use both panreactive and subunit-specific fluorescent activity-based probes (ABPs) to quantify the proteasome activity in living cells, in the presence or absence of the potent proteasome inhibitor bortezomib. Active proteasome subunits from cell lysates are affinity-purified via a biotinylated ABP. Purification from live cells involves a two-step ABP approach using a reagent with a cell-permeable azide-warhead and postlysis installation of biotin. By means of liquid chromatography–mass spectrometry (LC-MS)-based proteomics, we can accurately identify the enriched proteins and the active site peptides of the enzymes, and relatively quantify all the proteasome activities in one experiment. The fluorescence ABPP protocols takes 2–3 d, and approximately 8–10 d are needed to complete the entire protocol.

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Figure 1: Proteasome ABPP.
Figure 2: Results of fluorescence-based quantitative proteasome ABPP.
Figure 3: Schematic overview of the quantitative activity-based proteasome profiling experiments.
Figure 4: Direct and two-step activity-based affinity purification of the proteasome β-subunits with streptavidin beads from EL4 lysate.
Figure 5: Active site identification of the murine β2 subunit by one-step and two-step ABPP with LC-MS analysis.
Figure 6: Competitive ABPP assay in EL4 cells.

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Acknowledgements

We are grateful to the Netherlands Genomics Initiative, the Netherlands Proteomics Center and the Netherlands Organization for Scientific Research (NWO) for funding this work.

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Authors and Affiliations

Authors

Contributions

N.L. carried out the cell culture (treatment), affinity purification, SDS-PAGE imaging work and prepared the first draft of the manuscript and subsequent modifications. C.-L.K. and G.P. carried out the cell culture (treatment), affinity purification and SDS-PAGE imaging work. M.V., L.I.W., W.A.v.d.L. and M.R. refined the design and synthesis of the chemical tools used in this work. H.v.d.E., E.v.G. and J.G. performed LC-MS analysis and data processing. G.P.v.W., H.S.O. and B.I.F. supervised the work and were involved in manuscript preparation.

Corresponding author

Correspondence to Bogdan I Florea.

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The authors declare no competing financial interests.

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Li, N., Kuo, CL., Paniagua, G. et al. Relative quantification of proteasome activity by activity-based protein profiling and LC-MS/MS. Nat Protoc 8, 1155–1168 (2013). https://doi.org/10.1038/nprot.2013.065

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