6L5K

ARF5 Aux/IAA17 Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.91 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.230 

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Literature

Determinants of PB1 Domain Interactions in Auxin Response Factor ARF5 and Repressor IAA17.

Kim, Y.Park, C.Cha, S.Han, M.Ryu, K.S.Suh, J.Y.

(2020) J Mol Biol 432: 4010-4022

  • DOI: 10.1016/j.jmb.2020.04.007
  • Primary Citation of Related Structures:  
    6L5K

  • PubMed Abstract: 
  • Auxin is a plant hormone that is central to plant growth and development from embryogenesis to senescence. Auxin signaling is mediated by auxin response transcription factors (ARFs) and Aux/IAA repressors that regulate the expression of a multitude of au ...

    Auxin is a plant hormone that is central to plant growth and development from embryogenesis to senescence. Auxin signaling is mediated by auxin response transcription factors (ARFs) and Aux/IAA repressors that regulate the expression of a multitude of auxin response genes. ARF and Aux/IAA proteins assemble into homomeric and heteromeric complexes via their conserved PB1 domains. Here we report the first crystal structure of the PB1 complex between ARF5 and IAA17 of Arabidopsis thaliana, which represents the transcriptionally repressed state at low auxin levels. The PB1 domains assemble in a head-to-tail manner with a backbone arrangement similar to that of the ARF5:ARF5 PB1 complex. The ARF5:IAA17 complex, however, reveals distinct points of contact that promote the ARF5:IAA17 interaction over the ARF5:ARF5 interaction. Specifically, surface charges at the interface form salt-bridges that distinguish the homomeric and heteromeric complexes, revealing common and specific interfaces between transcriptionally repressed and derepressed states. Further, the salt-bridges can be reconfigured to switch the affinity between homomeric and heteromeric complexes in an incremental manner. The complex structure combined with quantitative binding analyses would be essential for deciphering the PB1 interaction code underlying the transcriptional regulation of auxin signaling.


    Organizational Affiliation

    Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea; Institute for Biomedical Sciences, Shinshu University, Minamiminowa, Nagano 399-4598, Japan. Electronic address: jysuh@snu.ac.kr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Auxin response factor 5 A98Arabidopsis thalianaMutation(s): 5 
Gene Names: ARF5IAA24MPAt1g19850F6F9.10
Find proteins for P93024 (Arabidopsis thaliana)
Explore P93024 
Go to UniProtKB:  P93024
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Auxin-responsive protein IAA17 B113Arabidopsis thalianaMutation(s): 3 
Gene Names: IAA17AXR3At1g04250F19P19.31
Find proteins for P93830 (Arabidopsis thaliana)
Explore P93830 
Go to UniProtKB:  P93830
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.91 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.230 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.894α = 90
b = 79.894β = 90
c = 116.025γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data collection
HKL-2000data scaling
PHENIXmodel building

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2020-09-02
    Type: Initial release