Fiche publication
Date publication
mars 2015
Journal
Proceedings of the National Academy of Sciences of the United States of America
Auteurs
Membres identifiés du Cancéropôle Est :
Dr GOGL Gergo
Tous les auteurs :
Alexa A, Gógl G, Glatz G, Garai Á, Zeke A, Varga J, Dudás E, Jeszenői N, Bodor A, Hetényi C, Reményi A
Lien Pubmed
Résumé
Mitogen-activated protein kinases (MAPKs) bind and activate their downstream kinase substrates, MAPK-activated protein kinases (MAPKAPKs). Notably, extracellular signal regulated kinase 2 (ERK2) phosphorylates ribosomal S6 kinase 1 (RSK1), which promotes cellular growth. Here, we determined the crystal structure of an RSK1 construct in complex with its activator kinase. The structure captures the kinase-kinase complex in a precatalytic state where the activation loop of the downstream kinase (RSK1) faces the enzyme's (ERK2) catalytic site. Molecular dynamics simulation was used to show how this heterodimer could shift into a signaling-competent state. This structural analysis combined with biochemical and cellular studies on MAPK→MAPKAPK signaling showed that the interaction between the MAPK binding linear motif (residing in a disordered kinase domain extension) and the ERK2 "docking" groove plays the major role in making an encounter complex. This interaction holds kinase domains proximal as they "readjust," whereas generic kinase domain surface contacts bring them into a catalytically competent state.
Mots clés
ERK2, RSK1, protein kinase, signal transduction, structural biology
Référence
Proc Natl Acad Sci U S A. 2015 03 3;112(9):2711-6
