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Related Experiment Videos

Proteomic analysis of kinase inhibitor selectivity and function.

Klaus Godl1, Henrik Daub

  • 1Axxima Pharmaceuticals AG, Max-Lebsche-Platz 32, München, Germany.

Cell Cycle (Georgetown, Tex.)
|January 31, 2004
PubMed
Summary

Small molecule kinase inhibitors, like SB 203580, may target more proteins than expected. This study reveals broader cellular effects, questioning the selectivity of many "specific" kinase inhibitors.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Small molecule inhibitors are key tools in signal transduction research.
  • Limited data exists on the selectivity of many protein kinase inhibitors.
  • SB 203580 was considered a specific inhibitor of p38 kinase.

Purpose of the Study:

  • To develop an efficient chemical proteomics method for target identification.
  • To characterize the cellular targets of the protein kinase inhibitor SB 203580.
  • To assess the selectivity of SB 203580 and other kinase inhibitors.

Main Methods:

  • Chemical proteomics approach.
  • Cellular target characterization.
  • High-affinity target identification.

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Main Results:

  • Identified multiple protein kinases as high-affinity targets of SB 203580.
  • Demonstrated a more complex cellular mode of action for SB 203580 than previously assumed.
  • Revealed potential lack of selectivity in widely used kinase inhibitors.

Conclusions:

  • SB 203580 exhibits broader target engagement than previously recognized.
  • The selectivity of many "specific" protein kinase inhibitors may be limited.
  • Further evaluation of kinase inhibitor selectivity using proteomics is warranted.