MAP kinases associate with high molecular weight multiprotein complexes

Carlton J. Bequette, Sarah R. Hind, Sarah Pulliam, Rebecca Higgins, Johannes W. Stratmann

Research output: Contribution to journalArticle

Abstract

Plant responses to the environment and developmental processes are mediated by a complex signaling network. The Arabidopsis thaliana mitogen-Activated protein kinases (MAPKs) MPK3 and MPK6 and their orthologs in other plants are shared signal transducers that respond to many developmental and environmental signals and thus represent highly connected hubs in the cellular signaling network. In animals, specific MAPK signaling complexes are assembled which enable input-specific protein-protein interactions and thus specific signaling outcomes. In plants, not much is known about such signaling complexes. Here, we report that MPK3, MPK6, and MPK10 orthologs in tomato, tobacco, and Arabidopsis as well as tomato MAPK kinase 4 (MKK4) associate with high molecular weight (∼250-550 kDa) multiprotein complexes. Elicitation by the defense-Associated peptides flg22 and systemin resulted in phosphorylation and activation of the monomeric MAPKs, whereas the complex-Associated MAPKs remained unphosphorylated and inactive. In contrast, treatment of tomato cells with a phosphatase inhibitor resulted in association of phosphorylated MPK1/2 with the complex. These results demonstrate that plant MAPKs and MAPKKs dynamically assemble into stable multiprotein complexes and this may depend on their phosphorylation status. Identification of the constituents of these multiprotein complexes promises a deeper understanding of signaling dynamics.

Original languageEnglish (US)
Pages (from-to)643-654
Number of pages12
JournalJournal of experimental botany
Volume69
Issue number3
DOIs
StatePublished - Jan 23 2018

Keywords

  • Arabidopsis
  • MAP kinase signaling
  • MAPK
  • MAPKK
  • multiprotein complex
  • phosphorylation
  • scaffold
  • signal transduction
  • size-exclusion chromatography
  • tomato

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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