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MAP kinases associate with high molecular weight multiprotein complexes.

Carlton J Bequette1, Sarah R Hind1, Sarah Pulliam1

  • 1Department of Biological Sciences, University of South Carolina, Columbia, USA.

Journal of Experimental Botany
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PubMed
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Plant mitogen-activated protein kinases (MAPKs) form stable protein complexes. These complexes are inactive until specific signals trigger their assembly, revealing new insights into plant signaling networks.

Keywords:
ArabidopsisMAP kinase signalingMAPKMAPKKmultiprotein complexphosphorylationscaffoldsignal transductionsize-exclusion chromatographytomato

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Area of Science:

  • Plant molecular biology
  • Cellular signaling pathways
  • Plant defense mechanisms

Background:

  • Plant development and environmental responses rely on complex signaling networks.
  • Mitogen-activated protein kinases (MAPKs) like MPK3 and MPK6 are key signal transducers in plants.
  • Little is known about plant MAPK signaling complexes compared to animal systems.

Purpose of the Study:

  • To investigate the existence and characteristics of plant MAPK signaling complexes.
  • To determine how these complexes respond to defense-related signals.
  • To explore the role of phosphorylation in MAPK complex dynamics.

Main Methods:

  • Co-immunoprecipitation assays to detect protein complex formation.
  • Analysis of MAPK phosphorylation and activity in response to elicitors (flg22, systemin).
  • Treatment with phosphatase inhibitors to study complex assembly dynamics.

Main Results:

  • MPK3, MPK6, and MPK10 orthologs, along with MKK4, associate with high molecular weight (~250-550 kDa) multiprotein complexes in tomato, tobacco, and Arabidopsis.
  • Defense elicitation led to phosphorylation and activation of monomeric MAPKs, while complex-associated MAPKs remained inactive.
  • Phosphatase inhibition induced the association of phosphorylated MPK1/2 with complexes, suggesting phosphorylation-dependent assembly.

Conclusions:

  • Plant MAPKs and MAPKKs dynamically form stable multiprotein complexes.
  • Complex assembly appears to be regulated by the phosphorylation status of the MAPKs.
  • Further identification of complex constituents will enhance understanding of plant signaling dynamics.