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Updated: Feb 11, 2026

An In Vitro System to Study Tumor Dormancy and the Switch to Metastatic Growth
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An In Vitro System to Study Tumor Dormancy and the Switch to Metastatic Growth

Published on: August 11, 2011

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Ras-A Molecular Switch Involved in Tumor Formation

Alfred Wittinghofer1, Herbert Waldmann1

  • 1Max-Planck-Institut für molekulare Physiologie Otto-Hahn-Strasse 11, 44227 Dortmund, Germany, Fax: (+49) 231-1332199.

Angewandte Chemie (International Ed. in English)
|May 2, 2018
PubMed

Insights

Ras proteins act as molecular switches controlling cell growth. Mutations in Ras disrupt this function, leading to cancer. Understanding Ras is key to developing targeted cancer therapies.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • Ras proteins are key regulators of cellular signaling pathways.
  • Mutations in Ras are implicated in approximately 20-30% of human cancers.
  • Ras functions as a molecular switch, cycling between GDP-bound (OFF) and GTP-bound (ON) states.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying Ras protein function.
  • To understand how mutations in Ras lead to oncogenesis.
  • To identify potential targets for Ras-directed anticancer drug development.

Main Methods:

  • The study focuses on the biochemical properties of Ras proteins, including their GTP-hydrolyzing activity.
  • Investigates the role of GTPase-activating protein (GAP) in regulating Ras activity.
  • Examines the impact of specific point mutations on Ras function and its role in signal transduction.

Main Results:

  • Ras proteins bind GDP/GTP with high affinity and exhibit GTP-hydrolyzing activity in the presence of GAP.
  • Oncogenic Ras mutations impair GTPase activity, locking the protein in an active state.
  • This sustained activation of Ras contributes to uncontrolled cell growth and tumor formation.

Conclusions:

  • Ras proteins are critical regulators of cell signaling, acting as molecular switches.
  • Dysfunctional Ras signaling due to mutations is a significant driver of human cancer.
  • Further research into Ras molecular mechanisms is crucial for developing effective antitumor strategies.
Keywords:
GTP hydrolysisantitumor agentsdrug researchenzyme inhibitorsproteins

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