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Article Dans Une Revue Nature Communications Année : 2023

RAS-independent ERK activation by constitutively active KSR3 in non-chordate metazoa

Aline Chessel
  • Fonction : Auteur
Noémie de Crozé
  • Fonction : Auteur
Maria Dolores Molina
  • Fonction : Auteur
Laura Taberner
Philippe Dru
Luc Martin
  • Fonction : Auteur
Thierry Lepage

Résumé

During early development of the sea urchin embryo, activation of ERK signalling in mesodermal precursors is not triggered by extracellular RTK ligands but by a cell-autonomous, RAS-independent mechanism that was not understood. We discovered that in these cells, ERK signalling is activated through the transcriptional activation of a gene encoding a protein related to Kinase Suppressor of Ras, that we named KSR3. KSR3 belongs to a family of catalytically inactive allosteric activators of RAF. Phylogenetic analysis revealed that genes encoding kinase defective KSR3 proteins are present in most non-chordate metazoa but have been lost in flies and nematodes. We show that the structure of KSR3 factors resembles that of several oncogenic human RAF mutants and that KSR3 from echinoderms, cnidarians and hemichordates activate ERK signalling independently of RAS when overexpressed in cultured cells. Finally, we used the sequence of KSR3 factors to identify activating mutations of human B-RAF. These findings reveal key functions for this family of factors as activators of RAF in RAS-independent ERK signalling in invertebrates. They have implications on the evolution of the ERK signalling pathway and suggest a mechanism for its co-option in the course of evolution.
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Dates et versions

hal-04310615 , version 1 (27-11-2023)

Identifiants

Citer

Aline Chessel, Noémie de Crozé, Maria Dolores Molina, Laura Taberner, Philippe Dru, et al.. RAS-independent ERK activation by constitutively active KSR3 in non-chordate metazoa. Nature Communications, 2023, 14, pp.3970. ⟨10.1038/s41467-023-39606-y⟩. ⟨hal-04310615⟩
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