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Updated: Mar 29, 2026

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
07:49

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods

Published on: July 17, 2019

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Phosphorylation of RAF Kinase Dimers Drives Conformational Changes that Facilitate Transactivation

Pablo G Jambrina1, Nora Rauch2, Ruth Pilkington2

  • 1Department of Chemistry, King's College London, London, SE1 1DB, UK.

Angewandte Chemie (International Ed. in English)
|December 9, 2015
PubMed

Insights

Phosphorylation of RAF kinases promotes dimerization by forming salt bridges, enhancing RAF inhibitor resistance. This study reveals a structure-based mechanism for RAF auto-transactivation, offering new strategies against drug resistance.

Area of Science:

  • Molecular biology
  • Biochemistry
  • Structural biology

Background:

  • RAF kinases are crucial in the MAPK pathway and are targets for cancer therapy.
  • RAF dimerization contributes to physiological activation and drug resistance.
  • Understanding RAF activation mechanisms is key for developing effective cancer treatments.

Purpose of the Study:

  • To elucidate the structural mechanism by which RAF dimerization occurs.
  • To investigate the role of phosphorylation in facilitating RAF dimerization.
  • To provide insights into overcoming drug resistance in RAF-targeted therapies.

Main Methods:

  • Utilized molecular dynamics simulations.
  • Analyzed interprotomer salt bridge formation.
  • Examined interactions between the R-spine, a conserved Trp residue, and the N-terminal acidic (NtA) motif.

Main Results:

  • Phosphorylation of the NtA motif facilitates RAF dimerization via interprotomer salt bridges.
  • The R-spine interacts with a conserved Trp residue near the NtA motif, linking active sites.
  • A structure-based mechanism for RAF auto-transactivation is proposed.

Conclusions:

  • This study provides the first structure-based mechanism for RAF auto-transactivation.
  • The findings illuminate how phosphorylation drives RAF dimerization and modulates activity.
  • The proposed mechanism may be applicable to other kinases, aiding in overcoming drug resistance.
Keywords:
RAF kinasekinasesmolecular dynamicsoncogenic signalingphosphorylation

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