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Genes Dev. 2009 Jan 1;23(1):80-92. doi: 10.1101/gad.1740009. Epub 2008 Dec 18.

MAPK target networks in Arabidopsis thaliana revealed using functional protein microarrays.

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  • 1Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520, USA.

Abstract

Signaling through mitogen-activated protein kinases (MPKs) cascades is a complex and fundamental process in eukaryotes, requiring MPK-activating kinases (MKKs) and MKK-activating kinases (MKKKs). However, to date only a limited number of MKK-MPK interactions and MPK phosphorylation substrates have been revealed. We determined which Arabidopsis thaliana MKKs preferentially activate 10 different MPKs in vivo and used the activated MPKs to probe high-density protein microarrays to determine their phosphorylation targets. Our analyses revealed known and novel signaling modules encompassing 570 MPK phosphorylation substrates; these substrates were enriched in transcription factors involved in the regulation of development, defense, and stress responses. Selected MPK substrates were validated by in planta reconstitution experiments. A subset of activated and wild-type MKKs induced cell death, indicating a possible role for these MKKs in the regulation of cell death. Interestingly, MKK7- and MKK9-induced death requires Sgt1, a known regulator of cell death induced during plant innate immunity. Our predicted MKK-MPK phosphorylation network constitutes a valuable resource to understand the function and specificity of MPK signaling systems.

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PMID:
19095804
[PubMed - indexed for MEDLINE]
PMCID:
PMC2632172
Free PMC Article
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