alpha-catenin M-domain

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Crystal Structure of the M-Fragment of Alpha-Catenin: Implications for Modulation of Cell Adhesion.

Yang, J.Dokurno, P.Tonks, N.K.Barford, D.

(2001) EMBO J 20: 3645

  • DOI: https://doi.org/10.1093/emboj/20.14.3645
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The cytoskeletal protein alpha-catenin, which shares structural similarity with vinculin, is required for cadherin-mediated cell adhesion, and functions to modulate cell adhesive strength and to link the cadherins to the actin-based cytoskeleton. Here we describe the crystal structure of a region of alpha-catenin (residues 377-633) termed the M-fragment. The M-fragment is composed of a tandem repeat of two antiparallel four-helix bundles of virtually identical architectures that are related in structure to the dimerization domain of alpha-catenin and the tail region of vinculin. These results suggest that alpha-catenin is composed of repeating antiparallel helical domains. The region of alpha-catenin previously defined as an adhesion modulation domain corresponds to the C-terminal four-helix bundle of the M-fragment, and in the crystal lattice these domains exist as dimers. Evidence for dimerization of the M-fragment of alpha-catenin in solution was detected by chemical cross-linking experiments. The tendency of the adhesion modulation domain to form dimers may explain its biological activity of promoting cell-cell adhesiveness by inducing lateral dimerization of the associated cadherin molecule.

  • Organizational Affiliation

    Section of Structural Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
256Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P35221 (Homo sapiens)
Explore P35221 
Go to UniProtKB:  P35221
PHAROS:  P35221
GTEx:  ENSG00000044115 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35221
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.863α = 90
b = 85.703β = 100.47
c = 75.481γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-08-07
    Type: Initial release
  • Version 1.1: 2016-02-10
    Changes: Database references, Derived calculations, Non-polymer description, Other, Refinement description, Structure summary, Version format compliance