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MEKK1 Is Required for MPK4 Activation and Regulates Tissue-specific and Temperature-dependent Cell Death in Arabidopsis

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Ichimura, Kazuya, Casais, Catarina, Peck, Scott C., Shinozaki, Kazuo, Shirasu, Ken·2006·Journal of Biological Chemistry

Abstract

Innate immunity signaling pathways in both animals and plants are regulated by mitogen-activated protein kinase (MAPK) cascades. An Arabidopsis MAPK cascade (MEKK1, MKK4/MKK5, and MPK3/MPK6) has been proposed to function downstream of the flagellin receptor FLS2 based on biochemical assays using transient overexpression of candidate components. To genetically test this model, we characterized two mekk1 mutants. We show here that MEKK1 is not required for flagellin-triggered activation of MPK3 and MPK6. Instead, MEKK1 is essential for activation of MPK4, a MAPK that negatively regulates systemic acquired resistance. We also showed that MEKK1 negatively regulates temperature-sensitive and tissue-specific cell death and H(2)O(2) accumulation that are partly dependent on both RAR1, a key component in resistance protein function, and SID2, an isochorismate synthase required for salicylic acid production upon pathogen infection.

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Metadata

Authors
Ichimura, K., Casais, C., Peck, S. C., Shinozaki, K., & Shirasu, K.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2006-12
Volume
281
Issue
48
Pages
36969-36976
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2075068237
Cited by
293
References
2
FWCI
22.07
Type
journal article
Language
en
Open access
hybrid

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Ichimura, K., Casais, C., Peck, S. C., Shinozaki, K., & Shirasu, K. (2006). MEKK1 Is Required for MPK4 Activation and Regulates Tissue-specific and Temperature-dependent Cell Death in Arabidopsis. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.m605319200

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