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Motif-Targeting Phosphoproteome Analysis of Cancer Cells for Profiling Kinase Inhibitors
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Motif-Targeting Phosphoproteome Analysis of Cancer Cells for Profiling Kinase Inhibitors
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Journal Article
Motif-Targeting Phosphoproteome Analysis of Cancer Cells for Profiling Kinase Inhibitors
2022
Overview
We present a motif-targeting phosphoproteome analysis workflow utilizing in vitro kinase reaction to enrich a subset of peptides with specific primary sequence motifs. Phosphopeptides are enriched and dephosphorylated with alkaline phosphatase, followed by in vitro kinase reaction to phosphorylate substrate peptides with specific primary-sequence motifs. These phosphopeptides are enriched again, TMT-labeled, dephosphorylated to enhance MS-detectability, and analyzed by LC/MS/MS. We applied this approach to inhibitor-treated cancer cells, and successfully profiled the inhibitory spectra of multiple kinase inhibitors. We anticipate this approach will be applicable to target specific subsets of the phosphoproteome using the wide variety of available recombinant protein kinases.
Publisher
MDPI AG,MDPI
Subject
