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Model of the Regulatory Mechanism of WRKY8 by MAPK-Dependent Phosphorylation.
Pathogen recognition leads to activation of MEK2 by unidentified MAP3K(s). Active MEK2 phosphorylates and activates SIPK, NTF4, and WIPK. Active SIPK interacts with WRKY8 in a D domain–dependent manner and phosphorylates WRKY8. Active NTF4 and WIPK may act in a way similar to SIPK. Phosphorylated and activated WRKY8 binds to W-box sites within its target genes and upregulates the expression of these genes.
