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Updated: May 13, 2026

Exploring Biomolecular Interaction Between the Molecular Chaperone Hsp90 and Its Client Protein Kinase Cdc37 using Field-Effect Biosensing Technology
09:39

Exploring Biomolecular Interaction Between the Molecular Chaperone Hsp90 and Its Client Protein Kinase Cdc37 using Field-Effect Biosensing Technology

Published on: March 31, 2022

ATP-competitive inhibitors block protein kinase recruitment to the Hsp90-Cdc37 system

Sigrun Polier1, Rahul S Samant, Paul A Clarke

  • 1Medical Research Council Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton, UK. sigrun.polier@sussex.ac.uk

Nature Chemical Biology
|March 19, 2013
PubMed

Insights

Cdc37 protein links kinases to the Hsp90 chaperone. ATP-competitive inhibitors block this interaction, leading to cancer kinase degradation and potential therapeutic effects.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Biology

Background:

  • Cdc37 acts as a scaffold protein, bridging protein kinases and the Hsp90 molecular chaperone.
  • The Hsp90 chaperone system is crucial for the stability and function of many client proteins, including kinases.
  • Inhibition of Hsp90 leads to the degradation of its kinase clients, demonstrating therapeutic potential in cancer.

Purpose of the Study:

  • To investigate the role of the Hsp90-Cdc37 complex in regulating kinase activity.
  • To determine how ATP-competitive kinase inhibitors affect the interaction between Cdc37 and protein kinases.
  • To elucidate the mechanism by which ATP-competitive inhibitors exert their therapeutic effects in cancer cells.

Main Methods:

  • Biochemical assays to assess ATP binding to client kinases.
  • In vitro studies to analyze the interaction between Cdc37, Hsp90, and client kinases.
  • Cell-based assays using cancer cell lines treated with ATP-competitive inhibitors.

Main Results:

  • Cdc37 directly inhibits ATP binding to client kinases, suggesting a role in modulating kinase activity.
  • ATP-competitive kinase inhibitors, such as vemurafenib and lapatinib, antagonize Cdc37 binding to protein kinases.
  • Oncogenic kinases (e.g., B-Raf, ErbB2) are deprived of Hsp90-Cdc37 complex access by these inhibitors, leading to their degradation in cancer cells.

Conclusions:

  • The Hsp90-Cdc37 complex plays a critical role in regulating the activity of protein kinase clients.
  • ATP-competitive kinase inhibitors can disrupt the Hsp90-Cdc37 chaperone system.
  • Targeted deprivation of chaperone machinery by these inhibitors contributes to the degradation of oncogenic kinases and may underpin their efficacy in cancer therapy.

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