Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 65.97 kDa 
• Atom Count: 4148 
• Residue Count: 541 
• Unique protein chains: 2

1QZ7

Beta-catenin binding domain of Axin in complex with beta-catenin

• DOI: 10.2210/pdb1QZ7/pdb

• Classification: CELL ADHESION
• Organism(s): Homo sapiens, Xenopus laevis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-09-15 Released: 2003-11-18 
• Deposition Author(s): Xing, Y., Clements, W.K., Kimelman, D., Xu, W.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.256 
• R-Value Work: 0.221 
• R-Value Observed: 0.221 

Literature

Crystal structure of a beta-catenin/Axin complex suggests a mechanism for the {beta}-catenin destruction complex

Xing, Y., Clements, W.K., Kimelman, D., Xu, W.

(2003) Genes Dev 17: 2753-2764

• PubMed: 14600025 
• DOI: 10.1101/gad.1142603
• Structures With Same Primary Citation


• PubMed Abstract: 
  

The "beta-catenin destruction complex" is central to canonical Wnt/beta-catenin signaling. The scaffolding protein Axin and the tumor suppressor adenomatous polyposis coli protein (APC) are critical components of this complex, required for rapid beta-catenin turnover. We determined the crystal structure of a complex between beta-catenin and the beta-catenin-binding domain of Axin (Axin-CBD). The Axin-CBD forms a helix that occupies the groove formed by the third and fourth armadillo repeats of beta-catenin and thus precludes the simultaneous binding of other beta-catenin partners in this region. Our biochemical studies demonstrate that, when phosphorylated, the 20-amino acid repeat region of APC competes with Axin for binding to beta-catenin. We propose that a key function of APC in the beta-catenin destruction complex is to remove phosphorylated beta-catenin product from the active site.

---

Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Beta-catenin	A	533	Homo sapiens	Mutation(s): 0  Gene Names: CTNNB1, CTNNB, OK/SW-cl.35, PRO2286
Find proteins for P35222 (Homo sapiens) Explore P35222  Go to UniProtKB:  P35222
NIH Common Fund Data Resources
PHAROS  P35222 GTEx  ENSG00000168036

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Axin	B	70	Xenopus laevis	Mutation(s): 0  Gene Names: axin, axin1, axn
Find proteins for Q9YGY0 (Xenopus laevis) Explore Q9YGY0  Go to UniProtKB:  Q9YGY0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.256 
• R-Value Work: 0.221 
• R-Value Observed: 0.221 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.141	α = 90
b = 75.041	β = 97.47
c = 101.398	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-09-15 
• Released Date: 2003-11-18 
Deposition Author(s): Xing, Y., Clements, W.K., Kimelman, D., Xu, W.

Revision History 

• Version 1.0: 2003-11-18
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance