Quantitative chemical proteomics reveals mechanisms of action of clinical ABL kinase inhibitors

M Bantscheff, D Eberhard, Y Abraham, S Bastuck… - Nature …, 2007 - nature.com
M Bantscheff, D Eberhard, Y Abraham, S Bastuck, M Boesche, S Hobson, T Mathieson…
Nature biotechnology, 2007nature.com
We describe a chemical proteomics approach to profile the interaction of small molecules
with hundreds of endogenously expressed protein kinases and purine-binding proteins. This
subproteome is captured by immobilized nonselective kinase inhibitors (kinobeads), and the
bound proteins are quantified in parallel by mass spectrometry using isobaric tags for
relative and absolute quantification (iTRAQ). By measuring the competition with the affinity
matrix, we assess the binding of drugs to their targets in cell lysates and in cells. By mapping …
Abstract
We describe a chemical proteomics approach to profile the interaction of small molecules with hundreds of endogenously expressed protein kinases and purine-binding proteins. This subproteome is captured by immobilized nonselective kinase inhibitors (kinobeads), and the bound proteins are quantified in parallel by mass spectrometry using isobaric tags for relative and absolute quantification (iTRAQ). By measuring the competition with the affinity matrix, we assess the binding of drugs to their targets in cell lysates and in cells. By mapping drug-induced changes in the phosphorylation state of the captured proteome, we also analyze signaling pathways downstream of target kinases. Quantitative profiling of the drugs imatinib (Gleevec), dasatinib (Sprycel) and bosutinib in K562 cells confirms known targets including ABL and SRC family kinases and identifies the receptor tyrosine kinase DDR1 and the oxidoreductase NQO2 as novel targets of imatinib. The data suggest that our approach is a valuable tool for drug discovery.
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