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Arabidopsis jasmonate signaling pathway
Aurélie Gfeller1, Robin Liechti, Edward E Farmer
1Gene Expression Laboratory, Department of Plant Molecular Biology, Faculty of Biology and Medicine, University of Lausanne, Biophore, CH-1015 Lausanne, Switzerland.
Science Signaling
|February 18, 2010
Summary
Jasmonates regulate plant defense and growth. The hormone jasmonoyl-isoleucine (JA-Ile) is perceived by the COI1 receptor, leading to JAZ protein degradation and gene activation.
Area of Science:
- Plant Molecular Biology
- Plant Hormone Signaling
- Gene Regulation
Background:
- Jasmonates are crucial plant hormones regulating defense, growth, and fertility.
- Jasmonic acid (JA) is converted to the active form, jasmonoyl-isoleucine (JA-Ile).
- The SCF-COI1 E3 ubiquitin ligase complex and JASMONATE ZIM-DOMAIN (JAZ) proteins are key players in jasmonate signaling.
Purpose of the Study:
- To elucidate the molecular mechanisms of jasmonate perception and response.
- To identify the core components involved in JA-Ile signaling pathways.
- To understand how JAZ proteins mediate transcriptional regulation in response to jasmonates.
Main Methods:
- Identification of the SCF-COI1 E3 ubiquitin ligase complex.
- Characterization of JASMONATE ZIM-DOMAIN (JAZ) proteins and their interactions.
- Analysis of JA-Ile binding to COI1 and subsequent JAZ protein degradation.
- Investigating the role of transcription factors like MYC2 in jasmonate signaling.
Main Results:
- COI1 was identified as the primary receptor for JA-Ile.
- JA-Ile binding to COI1 promotes the formation of COI1-JAZ complexes.
- JAZ protein degradation, mediated by the SCF-COI1 complex, liberates transcription factors.
- Liberated transcription factors, in conjunction with Mediator, drive the expression of jasmonate-responsive genes.
- microRNA319 (miR319) was found to negatively regulate JA production.
Conclusions:
- The COI1-JAZ protein interaction is central to jasmonate signal transduction.
- JAZ protein degradation is a critical step for activating jasmonate-regulated gene expression.
- This pathway highlights a sophisticated mechanism for controlling plant responses to environmental stimuli.
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