Related Experiment Video

Updated: Nov 16, 2025

Author Spotlight: Integrating BRET-Based Assays and Rare Mutation Analysis to Decipher RAF Kinase Regulation in Live Cells
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Author Spotlight: Integrating BRET-Based Assays and Rare Mutation Analysis to Decipher RAF Kinase Regulation in Live Cells

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KRAS interaction with RAF1 RAS-binding domain and cysteine-rich domain provides insights into RAS-mediated RAF

Timothy H Tran1, Albert H Chan1, Lucy C Young2

  • 1NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, USA.

Nature Communications
|February 20, 2021
PubMed

Insights

RAS-RAF interaction is key for RAF activation. Crystal structures reveal how RAS-binding domain (RBD) and cysteine-rich domain (CRD) of RAF1 bind to KRAS, providing insights into cell signaling pathways.

Area of Science:

  • Molecular biology
  • Cell signaling
  • Structural biology

Background:

  • RAF activation is initiated by binding to active RAS, leading to RAF recruitment to the plasma membrane.
  • Understanding the molecular mechanisms of RAS-RAF interaction is crucial for deciphering cell signaling pathways.

Purpose of the Study:

  • To elucidate the molecular details of RAS-RAF interaction.
  • To present crystal structures of KRAS complexed with RAF1's RAS-binding domain (RBD) and cysteine-rich domain (CRD).

Main Methods:

  • X-ray crystallography was used to determine the structures of wild-type and oncogenic KRAS mutants bound to RAF1 RBD and CRD.
  • Analysis of structural data to understand the binding interfaces and molecular interactions.

Main Results:

  • Crystal structures reveal that RBD and CRD form a single structural entity that interacts extensively with KRAS.
  • Mutations at the KRAS-CRD interface significantly reduce RAF1 activation, even with only minor binding affinity changes.
  • A model of RAS-RAF complexation at the membrane was developed.

Conclusions:

  • The study provides molecular insights into RAS-RAF interactions during RAS-mediated RAF activation.
  • The findings highlight the importance of the combined RBD-CRD structural unit in KRAS binding and RAF activation.

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