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Scientific article
English

Proteome-Wide Profiling of Targets of Cysteine-reactive Small Molecules by using Ethynyl Benziodoxolone Reagents

Published inAngewandte Chemie, vol. 54, no. 37, p. 10852-10857
Publication date2015
Abstract

In this study, we present a highly efficient method for proteomic profiling of cysteine residues in complex proteomes and in living cells. Our method is based on alkynylation of cysteines in complex proteomes using a “clickable” alkynyl benziodoxolone bearing an azide group. This reaction proceeds fast, under mild physiological conditions, and with a very high degree of chemoselectivity. The formed azide-capped alkynyl–cysteine adducts are readily detectable by LC-MS/MS, and can be further functionalized with TAMRA or biotin alkyne via CuAAC. We demonstrate the utility of alkynyl benziodoxolones for chemical proteomics applications by identifying the proteomic targets of curcumin, a diarylheptanoid natural product that was and still is part of multiple human clinical trials as anticancer agent. Our results demonstrate that curcumin covalently modifies several key players of cellular signaling and metabolism, most notably the enzyme casein kinase I gamma. We anticipate that this new method for cysteine profiling will find broad application in chemical proteomics and drug discovery.

Keywords
  • Activity-based protein profiling
  • Curcumin
  • Mass spectrometry
  • Proteomics
  • Target identification
Citation (ISO format)
ABEGG, Daniel et al. Proteome-Wide Profiling of Targets of Cysteine-reactive Small Molecules by using Ethynyl Benziodoxolone Reagents. In: Angewandte Chemie, 2015, vol. 54, n° 37, p. 10852–10857. doi: 10.1002/anie.201505641
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ISSN of the journal1433-7851
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Creation09/02/2015 10:27:00 AM
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