Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 35.28 kDa 
• Atom Count: 2482 
• Modelled Residue Count: 297 
• Deposited Residue Count: 297 
• Unique protein chains: 1

1GC7

CRYSTAL STRUCTURE OF THE RADIXIN FERM DOMAIN

• PDB DOI: 10.2210/pdb1GC7/pdb

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


• Deposited: 2000-07-21 Released: 2000-09-20 
• Deposition Author(s): Hamada, K., Shimizu, T., Matsui, T., Tsukita, S., Tsukita, S., Hakoshima, T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.255 
• R-Value Work: 0.215 

Literature

Structural basis of the membrane-targeting and unmasking mechanisms of the radixin FERM domain.

Hamada, K., Shimizu, T., Matsui, T., Tsukita, S., Hakoshima, T.

(2000) EMBO J 19: 4449-4462

• PubMed: 10970839 
• DOI: 10.1093/emboj/19.17.4449
• Primary Citation of Related Structures:  
  1GC6, 1GC7


• PubMed Abstract: 
  

Radixin is a member of the ezrin/radixin/moesin (ERM) family of proteins, which play a role in the formation of the membrane-associated cytoskeleton by linking actin filaments and adhesion proteins. This cross-linking activity is regulated by phosphoinositides such as phosphatidylinositol 4,5-bisphosphate (PIP2) in the downstream of the small G protein Rho. The X-ray crystal structures of the radixin FERM domain, which is responsible for membrane binding, and its complex with inositol-(1,4, 5)-trisphosphate (IP3) have been determined. The domain consists of three subdomains featuring a ubiquitin-like fold, a four-helix bundle and a phosphotyrosine-binding-like domain, respectively. These subdomains are organized by intimate interdomain interactions to form characteristic grooves and clefts. One such groove is negatively charged and so is thought to interact with basic juxta-membrane regions of adhesion proteins. IP3 binds a basic cleft that is distinct from those of pleckstrin homology domains and is located on a positively charged flat molecular surface, suggesting an electrostatic mechanism of plasma membrane targeting. Based on the structural changes associated with IP3 binding, a possible unmasking mechanism of ERM proteins by PIP2 is proposed.

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Related Citations: 

• Crystallographic characterization of the membrane-binding domain of radixin
  Hamada, K., Shimizu, T., Matsui, T., Tsukita, S., Tsukita, S., Hakoshima, T.
  (2000) Acta Crystallogr D Biol Crystallogr 56: 922

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Organizational Affiliation: 

Department of Molecular Biology, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RADIXIN	A	297	Mus musculus	Mutation(s): 0  Gene Names: Rdx
UniProt & NIH Common Fund Data Resources
Find proteins for P26043 (Mus musculus) Explore P26043  Go to UniProtKB:  P26043
IMPC:  MGI:97887

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.255 
• R-Value Work: 0.215 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 96.33	α = 90
b = 96.33	β = 90
c = 133.04	γ = 90

Software Package:

Software Name	Purpose
MLPHARE	phasing
CNS	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-07-21 
• Released Date: 2000-09-20 
Deposition Author(s): Hamada, K., Shimizu, T., Matsui, T., Tsukita, S., Tsukita, S., Hakoshima, T.

Revision History  

• Version 1.0: 2000-09-20
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance