Phosphorylation of RAF kinase dimers drives conformational changes that facilitate transactivation

Pablo G. Jambrina, Nora Rauch, Ruth Pilkington, Katja Rybakova, Lan K. Nguyen, Boris N. Kholodenko, Nicolae-Viorel Buchete, Walter Kolch, Edina Rosta

Research output: Contribution to journalArticleOtherpeer-review

27 Citations (Scopus)

Abstract

RAF kinases are key players in the MAPK signaling pathway and are important targets for personalized cancer therapy. RAF dimerization is part of the physiological activation mechanism, together with phosphorylation, and is known to convey resistance to RAF inhibitors. Herein, molecular dynamics simulations are used to show that phosphorylation of a key N-terminal acidic (NtA) motif facilitates RAF dimerization by introducing several interprotomer salt bridges between the αC-helix and charged residues upstream of the NtA motif. Additionally, we show that the R-spine of RAF interacts with a conserved Trp residue in the vicinity of the NtA motif, connecting the active sites of two protomers and thereby modulating the cooperative interactions in the RAF dimer. Our findings provide a first structure-based mechanism for the auto-transactivation of RAF and could be generally applicable to other kinases, opening new pathways for overcoming dimerization-related drug resistance.
Original languageEnglish
Pages (from-to)983-986
Number of pages4
JournalAngewandte Chemie - International Edition
Volume55
Issue number3
DOIs
Publication statusPublished - 18 Jan 2016

Keywords

  • kinases
  • molecular dynamics
  • oncogenic signaling
  • phosphorylation
  • RAF kinase

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