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Related Experiment Videos

Why does the Ras switch "break" by oncogenic mutations?

Avital Shurki1, Arieh Warshel

  • 1Department of Chemistry, University of Southern California, Los Angeles, California 90089-1062, USA.

Proteins
|March 5, 2004
PubMed
Summary

Mutations in the RasGAP complex at Gln 61 lock cells in an ON state, causing cancer. This study reveals these mutations disrupt the active site

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Computational Biology

Background:

  • RasGAP complex structure elucidation links protein structure to cancer-causing mutations.
  • Gln 61 mutations in RasGAP are known to destroy GTPase activity, leading to cellular "ON" states and cancer.
  • The precise mechanism by which Gln 61 mutations drive oncogenesis remains unclear.

Purpose of the Study:

  • To elucidate the role of Gln 61 in the RasGAP complex's GTPase reaction.
  • To understand the molecular basis for Gln 61's critical function in cancer.
  • To investigate the impact of Gln 61 mutations on the catalytic activity and stability of the RasGAP complex.

Main Methods:

  • Computer simulations of the GTPase reaction involving Ras, RasGAP, and their mutants.
  • Analysis of activation energies and energy contributions associated with Gln 61 mutations.
  • Investigation of the transition state (TS) interactions and active site configuration.

Main Results:

  • Simulations accurately reproduced observed changes in activation energies due to Gln 61 mutations.
  • Gln 61 does not directly interact chemically, electrostatically, or sterically with the transition state.
  • Oncogenic Gln 61 mutations disrupt the preorganized catalytic configuration of the RasGAP active site, causing significant loss of transition state stabilization.

Conclusions:

  • Gln 61's function is allosteric, maintaining the active site's catalytic configuration.
  • The disruption of this configuration by mutations leads to reduced transition state stabilization and oncogenesis.
  • Findings have broader implications for understanding signal transduction proteins and related diseases.

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