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Ras-Specific GTPase-Activating Proteins-Structures, Mechanisms, and Interactions

Klaus Scheffzek1, Giridhar Shivalingaiah1

  • 1Division of Biological Chemistry (Biocenter), Medical University of Innsbruck, A-6020 Innsbruck, Austria.

Cold Spring Harbor Perspectives in Medicine
|August 15, 2018
PubMed

Insights

Ras-specific GTPase-activating proteins (RasGAPs) regulate Ras protein activity by stabilizing the transition state of GTP hydrolysis. Oncogenic Ras mutations often confer resistance to RasGAPs, leading to uncontrolled cell growth.

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Protein Structure and Function

Background:

  • Ras proteins are key regulators of cellular signaling pathways.
  • RasGAPs (Ras-specific GTPase-activating proteins) are critical negative regulators of Ras activity.
  • Dysregulation of Ras signaling is implicated in various cancers.

Purpose of the Study:

  • To review the current understanding of RasGAP structure, mechanism, and regulation.
  • To explore the dual-substrate specificity of RasGAPs.
  • To highlight the role of neurofibromin as a key Ras regulator in cellular growth and neuronal function.

Main Methods:

  • Literature review of existing research on RasGAPs.
  • Analysis of structural and mechanistic data for RasGAP proteins.
  • Discussion of regulatory mechanisms and substrate interactions.

Main Results:

  • RasGAPs accelerate GTP hydrolysis via a transition state stabilization mechanism.
  • Oncogenic Ras mutations can evade RasGAP regulation due to altered transition state interactions.
  • RasGAPs are modular proteins with catalytic and regulatory domains, influencing localization and function.

Conclusions:

  • RasGAPs are essential for controlling Ras signaling, with neurofibromin being a significant regulator.
  • Understanding RasGAP function and regulation is crucial for developing targeted cancer therapies.
  • Further research into RasGAP structure-function relationships can elucidate their role in disease.

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