Jasmonate signalling: a copycat of auxin signalling?

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. Perceptio...

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Bibliographic Details
Published in:	Plant, cell and environment Vol. 36; no. 12; pp. 2071 - 2084
Main Authors:	PÉREZ, A. CUÉLLAR, GOOSSENS, A.
Format:	Journal Article
Language:	English
Published:	Oxford Blackwell 01-12-2013 Wiley Subscription Services, Inc
Subjects:	Arabidopsis Biological and medical sciences crosstalk Cyclopentanes - metabolism EAR Fundamental and applied biological sciences. Psychology F‐box hormone metabolism Indoleacetic Acids - metabolism JAZ Models, Biological Oxylipins - metabolism Receptor Cross-Talk repression Repressor Proteins - metabolism Signal Transduction transcription factors Hormone JAZ Auxin Arabidopsis transcription factors hormone metabolism Plant ecology Repression Metabolism Signalling Arabidopsis thaliana Molecular signal F-box crosstalk Cruciferae Dicotyledones Angiospermae EAR Spermatophyta Experimental plant Transcription factor repression
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Summary:	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 E3‐ubiquitin ligases of the SKP1‐Cullin‐F‐box protein (SCF) type interact with specific repressor proteins. Across the plant kingdom, the Aux/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 26S 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. The last 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, two hormones that regulate diverse aspects of plant growth, development and interaction with the environment. In this review, we list each important element from the ‘core JA perception and early signalling module’, discuss their function and role in the JA‐cascade, to which protein family they belong and how striking it is that many of the closely related proteins function in another phytohormonal signalling cascade, that is of the auxins. We discuss the correlation and relevance of the sequence similarities and divergence with regard to the functioning of the respective proteins in the respective signalling cascades.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-3 content type line 23 ObjectType-Review-1 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0140-7791 1365-3040
DOI:	10.1111/pce.12121