4K1O | pdb_00004k1o

Crystal structure of the alphaN-catenin actin-binding domain

• PDB DOI: https://doi.org/10.2210/pdb4K1O/pdb

• Classification: CELL ADHESION
• Organism(s): Mus musculus
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2013-04-05 Released: 2013-05-01 
• Deposition Author(s): Ishiyama, N., Ikura, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 
  0.231 (Depositor), 0.237 (DCC) 
• R-Value Work: 
  0.195 (Depositor), 0.203 (DCC) 
• R-Value Observed: 
  0.198 (Depositor) 

Literature

An autoinhibited structure of alpha-catenin and its implications for vinculin recruitment to adherens junctions.

Ishiyama, N., Tanaka, N., Abe, K., Yang, Y.J., Abbas, Y.M., Umitsu, M., Nagar, B., Bueler, S.A., Rubinstein, J.L., Takeichi, M., Ikura, M.

(2013) J Biol Chem 288: 15913-15925

• PubMed: 23589308 
• DOI: https://doi.org/10.1074/jbc.M113.453928
• Primary Citation Related Structures: 
  4K1N, 4K1O


• PubMed Abstract: 
  

  α-Catenin is an actin- and vinculin-binding protein that regulates cell-cell adhesion by interacting with cadherin adhesion receptors through β-catenin, but the mechanisms by which it anchors the cadherin-catenin complex to the actin cytoskeleton at adherens junctions remain unclear. Here we determined crystal structures of αE-catenin in the autoinhibited state and the actin-binding domain of αN-catenin. Together with the small-angle x-ray scattering analysis of full-length αN-catenin, we deduced an elongated multidomain assembly of monomeric α-catenin that structurally and functionally couples the vinculin- and actin-binding mechanisms. Cellular and biochemical studies of αE- and αN-catenins show that αE-catenin recruits vinculin to adherens junctions more effectively than αN-catenin, partly because of its higher affinity for actin filaments. We propose a molecular switch mechanism involving multistate conformational changes of α-catenin. This would be driven by actomyosin-generated tension to dynamically regulate the vinculin-assisted linkage between adherens junctions and the actin cytoskeleton.

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Organizational Affiliation: 
• Campbell Family Cancer Research Institute, Ontario Cancer Institute, Toronto, Ontario M5G 1L7, Canada.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 29.39 kDa 
• Atom Count: 1,544 
• Modeled Residue Count: 200 
• Deposited Residue Count: 264 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Catenin alpha-2	A	264	Mus musculus	Mutation(s): 0  Gene Names: Catna2, Ctnna2
UniProt
Find proteins for Q61301 (Mus musculus) Explore Q61301  Go to UniProtKB:  Q61301

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A], D [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free:  0.231 (Depositor), 0.237 (DCC) 
• R-Value Work:  0.195 (Depositor), 0.203 (DCC) 
• R-Value Observed: 0.198 (Depositor) 

Space Group: P 3₂ 1 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 112.152	α = 90
b = 112.152	β = 90
c = 56.316	γ = 120

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
PHENIX	refinement
PDB_EXTRACT	data extraction
HKL-3000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2013-05-01 
Deposition Author(s): Ishiyama, N., Ikura, M.

Revision History  

• Version 1.0: 2013-05-01
  Type: Initial release
  
• Version 1.1: 2013-09-04
  Changes: Database references
• Version 1.2: 2024-02-28
  Changes: Data collection, Database references, Derived calculations