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MEKK2 inhibits activation of MAP kinases in Arabidopsis.

Plant J. 2020 Jul;103(2):705-714. doi:10.1111/tpj.14763. Epub 2020 Apr 28
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摘要


The Arabidopsis MEKK1-MKK1/MKK2-MPK4 kinase cascade is monitored by the nucleotide-binding leucine-rich-repeat immune receptor SUMM2. Disruption of this kinase cascade leads to activation of SUMM2-mediated immune responses. MEKK2, a close paralog of MEKK1, is required for defense responses mediated by SUMM2, the molecular mechanism of which is unclear. In this study, we showed that MEKK2 serves as a negative regulator of MPK4. It binds to MPK4 to directly inhibit its phosphorylation by upstream MKKs. Activation of SUMM2-mediated defense responses induces the expression of MEKK2, which in turn blocks MPK4 phosphorylation to further amplify immune responses mediated by SUMM2. Intriguingly, MEKK2 locates in a tandem repeat consisting of MEKK1, MEKK2 and MEKK3, which was generated from a recent gene duplication event, suggesting that MEKK2 evolved from a MAPKKK to become a negative regulator of MAP kinases.

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