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  1. IPB Halle
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    • Research Mission and Profile
    • Trenner 0
    • Molecular Signal Processing
      • Secretariat & All Staff
      • Technical Resources
      • Publications
      • Research Groups
        • Nutrient Sensing
        • Symbiosis Signaling
        • Jasmonate Signaling
    • Bioorganic Chemistry
      • Secretariat & All Staff
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      • Research Groups
        • Bioactives
        • Natural Products & Metabolomics
        • Biotechnology
        • Biofunctional Synthesis
        • Computational Chemistry
        • Data & Resources
    • Biochemistry of Plant Interactions
      • Secretariat & All Staff
      • Technical Resources
      • Publications
      • Research Groups
        • Calcium-dependent Protein Kinases
        • Cellular Signaling
        • Metabolite-based Defense Mechanisms
        • Nuclear Processes in Plant Defense
    • Cell and Metabolic Biology
      • Secretariat & All Staff
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        • Auxin Signaling
        • Bioorganic Chemistry
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Niemeyer, M.; Moreno Castillo, E.; Ihling, C.; Iacobucci, C.; Wilde, V.; Hellmuth, A.; Hoehenwarter, W.; Samodelov, S. L.; Zurbriggen, M. D.; Kastritis, P. L.; Sinz, A.; Calderón Villalobos, L. I. A.; Flexibility of intrinsically disordered degrons in AUX/IAA proteins reinforces auxin co-receptor assemblies Nat. Commun. 11 2277 (2020) DOI: 10.1038/s41467-020-16147-2
  • Abstract
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Cullin RING-type E3 ubiquitin ligases SCFTIR1/AFB1-5 and their AUX/IAA targets perceive the phytohormone auxin. The F-box protein TIR1 binds a surface-exposed degron in AUX/IAAs promoting their ubiquitylation and rapid auxin-regulated proteasomal degradation. Here, by adopting biochemical, structural proteomics and in vivo approaches we unveil how flexibility in AUX/IAAs and regions in TIR1 affect their conformational ensemble allowing surface accessibility of degrons. We resolve TIR1·auxin·IAA7 and TIR1·auxin·IAA12 complex topology, and show that flexible intrinsically disordered regions (IDRs) in the degron’s vicinity, cooperatively position AUX/IAAs on TIR1. We identify essential residues at the TIR1 N- and C-termini, which provide non-native interaction interfaces with IDRs and the folded PB1 domain of AUX/IAAs. We thereby establish a role for IDRs in modulating auxin receptor assemblies. By securing AUX/IAAs on two opposite surfaces of TIR1, IDR diversity supports locally tailored positioning for targeted ubiquitylation, and might provide conformational flexibility for a multiplicity of functional states.

Publications

Winkler, M.; Niemeyer, M.; Hellmuth, A.; Janitza, P.; Christ, G.; Samodelov, S. L.; Wilde, V.; Majovsky, P.; Trujillo, M.; Zurbriggen, M. D.; Hoehenwarter, W.; Quint, M.; Calderón Villalobos, L. I. A.; Variation in auxin sensing guides AUX/IAA transcriptional repressor ubiquitylation and destruction Nat. Commun. 8 15706 (2017) DOI: 10.1038/ncomms15706
  • Abstract
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Auxin is a small molecule morphogen that bridges SCFTIR1/AFB-AUX/IAA co-receptor interactions leading to ubiquitylation and proteasome-dependent degradation of AUX/IAA transcriptional repressors. Here, we systematically dissect auxin sensing by SCFTIR1-IAA6 and SCFTIR1-IAA19 co-receptor complexes, and assess IAA6/IAA19 ubiquitylation in vitro and IAA6/IAA19 degradation in vivo. We show that TIR1-IAA19 and TIR1-IAA6 have distinct auxin affinities that correlate with ubiquitylation and turnover dynamics of the AUX/IAA. We establish a system to track AUX/IAA ubiquitylation in IAA6 and IAA19 in vitro and show that it occurs in flexible hotspots in degron-flanking regions adorned with specific Lys residues. We propose that this signature is exploited during auxin-mediated SCFTIR1-AUX/IAA interactions. We present evidence for an evolving AUX/IAA repertoire, typified by the IAA6/IAA19 ohnologues, that discriminates the range of auxin concentrations found in plants. We postulate that the intrinsic flexibility of AUX/IAAs might bias their ubiquitylation and destruction kinetics enabling specific auxin responses.

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