PT  - JOURNAL ARTICLE
AU  - Thomas Vain
AU  - Sara Raggi
AU  - Noel Ferro
AU  - Deepak Kumar Barange
AU  - Martin Kieffer
AU  - Qian Ma
AU  - Siamsa M. Doyle
AU  - Mattias Thelander
AU  - Barbora Pařízková
AU  - Ondřej Novák
AU  - Alexandre Ismail
AU  - Per Anders Enquist
AU  - Adeline Rigal
AU  - Małgorzata Łangowska
AU  - Sigurd Ramans Harborough
AU  - Yi Zhang
AU  - Karin Ljung
AU  - Judy Callis
AU  - Fredrik Almqvist
AU  - Stefan Kepinski
AU  - Mark Estelle
AU  - Laurens Pauwels
AU  - Stéphanie Robert
TI  - Selective auxin agonists induce specific AUX/IAA protein degradation to modulate plant development
AID  - 10.1101/381608
DP  - 2018 Jan 01
TA  - bioRxiv
PG  - 381608
4099  - http://biorxiv.org/content/early/2018/07/31/381608.short
4100  - http://biorxiv.org/content/early/2018/07/31/381608.full
AB  - Auxin phytohormones control most aspects of plant development through a complex and interconnected signaling network. In the presence of auxin, AUXIN/INDOLE-3-ACETIC ACID (AUX/IAA) transcriptional repressors are targeted for degradation by the SKP1-CULLIN1-F-BOX (SCF) ubiquitin-protein ligases containing TRANSPORT INHIBITOR RESISTANT 1/AUXIN SIGNALING F-BOX (TIR1/AFB). CULLIN1-neddylation is required for SCFTIR1/AFB functionality as exemplified by mutants deficient in the NEDD8-activating enzyme subunit AUXIN-RESISTANT 1 (AXR1). Here, we report a chemical biology screen that identifies small molecules requiring AXR1 to modulate plant development. We selected four molecules of interest, RubNeddin1 to 4 (RN1 to 4), among which RN3 and RN4 trigger selective auxin responses at transcriptional, biochemical and morphological levels. This selective activity is explained by their ability to promote the interaction between TIR1 and a specific subset of AUX/IAA proteins, stimulating the degradation of particular AUX/IAA combinations. Finally, via a genetic screen using RN4, we revealed that the chromatin remodeling ATPase BRAHMA is implicated in auxin-mediated apical hook development. These results demonstrate the power of selective auxin agonists to dissect auxin perception for plant developmental functions.