5WZZ

The SIAH E3 ubiquitin ligases promote Wnt/ beta-catenin signaling through mediating Wnt-induced Axin degradation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The SIAH E3 ubiquitin ligases promote Wnt/ beta-catenin signaling through mediating Wnt-induced Axin degradation

Ji, L.Jiang, B.Jiang, X.Charlat, O.Chen, A.Mickanin, C.Bauer, A.Xu, W.Yan, X.-X.Cong, F.

(2017) Genes Dev 31: 904-915

  • DOI: https://doi.org/10.1101/gad.300053.117
  • Primary Citation of Related Structures:  
    5WZZ

  • PubMed Abstract: 

    The Wnt/β-catenin signaling pathway plays essential roles in embryonic development and adult tissue homeostasis. Axin is a concentration-limiting factor responsible for the formation of the β-catenin destruction complex. Wnt signaling itself promotes the degradation of Axin. However, the underlying molecular mechanism and biological relevance of this targeting of Axin have not been elucidated. Here, we identify SIAH1/2 (SIAH) as the E3 ligase mediating Wnt-induced Axin degradation. SIAH proteins promote the ubiquitination and proteasomal degradation of Axin through interacting with a VxP motif in the GSK3-binding domain of Axin, and this function of SIAH is counteracted by GSK3 binding to Axin. Structural analysis reveals that the Axin segment responsible for SIAH binding is also involved in GSK3 binding but adopts distinct conformations in Axin/SIAH and Axin/GSK3 complexes. Knockout of SIAH1 blocks Wnt-induced Axin ubiquitination and attenuates Wnt-induced β-catenin stabilization. Our data suggest that Wnt-induced dissociation of the Axin/GSK3 complex allows SIAH to interact with Axin not associated with GSK3 and promote its degradation and that SIAH-mediated Axin degradation represents an important feed-forward mechanism to achieve sustained Wnt/β-catenin signaling.


  • Organizational Affiliation

    Department of Biological Structure, University of Washington, Seattle, Washington 98195, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
E3 ubiquitin-protein ligase SIAH1
A, B, C, D
190Homo sapiensMutation(s): 0 
Gene Names: SIAH1HUMSIAH
EC: 6.3.2
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IUQ4 (Homo sapiens)
Explore Q8IUQ4 
Go to UniProtKB:  Q8IUQ4
GTEx:  ENSG00000196470 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IUQ4
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Axin-1
E, F, G, H
20Homo sapiensMutation(s): 0 
Gene Names: AXIN1AXIN
UniProt & NIH Common Fund Data Resources
Find proteins for O15169 (Homo sapiens)
Explore O15169 
Go to UniProtKB:  O15169
GTEx:  ENSG00000103126 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15169
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.502α = 90
b = 86.45β = 98.43
c = 117.454γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-08-16
    Type: Initial release
  • Version 1.1: 2017-08-23
    Changes: Structure summary
  • Version 1.2: 2017-08-30
    Changes: Data collection
  • Version 1.3: 2023-11-22
    Changes: Data collection, Database references, Derived calculations, Refinement description