JAZ repressor proteins are targets of the SCF(COI1) complex during jasmonate signalling
- PMID: 17637677
- DOI: 10.1038/nature05960
JAZ repressor proteins are targets of the SCF(COI1) complex during jasmonate signalling
Abstract
Jasmonate and related signalling compounds have a crucial role in both host immunity and development in plants, but the molecular details of the signalling mechanism are poorly understood. Here we identify members of the jasmonate ZIM-domain (JAZ) protein family as key regulators of jasmonate signalling. JAZ1 protein acts to repress transcription of jasmonate-responsive genes. Jasmonate treatment causes JAZ1 degradation and this degradation is dependent on activities of the SCF(COI1) ubiquitin ligase and the 26S proteasome. Furthermore, the jasmonoyl-isoleucine (JA-Ile) conjugate, but not other jasmonate-derivatives such as jasmonate, 12-oxo-phytodienoic acid, or methyl-jasmonate, promotes physical interaction between COI1 and JAZ1 proteins in the absence of other plant proteins. Our results suggest a model in which jasmonate ligands promote the binding of the SCF(COI1) ubiquitin ligase to and subsequent degradation of the JAZ1 repressor protein, and implicate the SCF(COI1)-JAZ1 protein complex as a site of perception of the plant hormone JA-Ile.
Comment in
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Plant biology: jasmonate perception machines.Nature. 2007 Aug 9;448(7154):659-60. doi: 10.1038/448659a. Nature. 2007. PMID: 17687317 No abstract available.
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