4ONS

Structural and thermodynamic characterization of cadherin-beta-catenin-alpha-catenin complex formation

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

Structural and Thermodynamic Characterization of Cadherin beta-Catenin alpha-Catenin Complex Formation.

Pokutta, S., Choi, H.J., Ahlsen, G., Hansen, S.D., Weis, W.I.

(2014) J.Biol.Chem. 289: 13589-13601

  • DOI: 10.1074/jbc.M114.554709

  • PubMed Abstract: 

    • The classical cadherin·β-catenin·α-catenin complex mediates homophilic cell-cell adhesion and mechanically couples the actin cytoskeletons of adjacent cells. Although α-catenin binds to β-catenin and to F-actin, β-catenin significantly weakens the af ...

    The classical cadherin·β-catenin·α-catenin complex mediates homophilic cell-cell adhesion and mechanically couples the actin cytoskeletons of adjacent cells. Although α-catenin binds to β-catenin and to F-actin, β-catenin significantly weakens the affinity of α-catenin for F-actin. Moreover, α-catenin self-associates into homodimers that block β-catenin binding. We investigated quantitatively and structurally αE- and αN-catenin dimer formation, their interaction with β-catenin and the cadherin·β-catenin complex, and the effect of the α-catenin actin-binding domain on β-catenin association. The two α-catenin variants differ in their self-association properties: at physiological temperatures, αE-catenin homodimerizes 10× more weakly than does αN-catenin but is kinetically trapped in its oligomeric state. Both αE- and αN-catenin bind to β-catenin with a Kd of 20 nM, and this affinity is increased by an order of magnitude when cadherin is bound to β-catenin. We describe the crystal structure of a complex representing the full β-catenin·αN-catenin interface. A three-dimensional model of the cadherin·β-catenin·α-catenin complex based on these new structural data suggests mechanisms for the enhanced stability of the ternary complex. The C-terminal actin-binding domain of α-catenin has no influence on the interactions with β-catenin, arguing against models in which β-catenin weakens actin binding by stabilizing inhibitory intramolecular interactions between the actin-binding domain and the rest of α-catenin.

    Organizational Affiliation: 

    From the Departments of Structural Biology and Molecular and Cellular Physiology, Stanford University, Stanford, California 94305.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Catenin alpha-2
A, C
248Mus musculusMutation(s): 0 
Gene Names: Ctnna2 (Catna2)
Find proteins for Q61301 (Mus musculus)
Go to UniProtKB:  Q61301
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Catenin beta-1
B, D
88Mus musculusMutation(s): 0 
Gene Names: Ctnnb1 (Catnb)
Find proteins for Q02248 (Mus musculus)
Go to UniProtKB:  Q02248
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.203 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 96.125α = 90.00
b = 96.125β = 90.00
c = 65.517γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction
XSCALEdata scaling
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-09
    Type: Initial release
  • Version 1.1: 2014-05-07
    Type: Database references
  • Version 1.2: 2014-05-28
    Type: Database references