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Jasmonate signalling: a copycat of auxin signalling?
Author(s) -
PÉREZ A. CUÉLLAR,
GOOSSENS A.
Publication year - 2013
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12121
Subject(s) - jasmonate , auxin , repressor , transcription factor , microbiology and biotechnology , signalling , biology , arabidopsis , signal transduction , plant hormone , gene , biochemistry , mutant
Plant hormones regulate almost all aspects of plant growth and development. The past decade has provided breakthrough discoveries in phytohormone sensing and signal transduction, and highlighted the striking mechanistic similarities between the auxin and jasmonate ( JA ) signalling pathways. Perception of auxin and JA involves the formation of co‐receptor complexes in which hormone‐specific E 3‐ubiquitin ligases of the SKP 1‐ C ullin‐ F ‐box protein ( SCF ) type interact with specific repressor proteins. Across the plant kingdom, the A ux/ IAA and the JASMONATE‐ZIM DOMAIN ( JAZ ) proteins correspond to the auxin‐ and JA ‐specific repressors, respectively. In the absence of the hormones, these repressors form a complex with transcription factors ( TFs ) specific for both pathways. They also recruit several proteins, among which the general co‐repressor TOPLESS , and thereby prevent the TFs from activating gene expression. The hormone‐mediated interaction between the SCF and the repressors targets the latter for 26 S proteasome‐mediated degradation, which, in turn, releases the TFs to allow modulating hormone‐dependent gene expression. In this review, we describe the similarities and differences in the auxin and JA signalling cascades with respect to the protein families and the protein domains involved in the formation of the pathway‐specific complexes.