Crystal Structure of the SH3-Guanylate kinase core domain of ZO-1

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Insights into regulated ligand binding sites from the structure of ZO-1 Src homology 3-guanylate kinase module.

Lye, M.F.Fanning, A.S.Su, Y.Anderson, J.M.Lavie, A.

(2010) J Biol Chem 285: 13907-13917

  • DOI: https://doi.org/10.1074/jbc.M109.093674
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Tight junctions are dynamic components of epithelial and endothelial cells that regulate the paracellular transport of ions, solutes, and immune cells. The assembly and permeability of these junctions is dependent on the zonula occludens (ZO) proteins, members of the membrane-associated guanylate kinase homolog (MAGUK) protein family, which are characterized by a core Src homology 3 (SH3)-GUK module that coordinates multiple protein-protein interactions. The structure of the ZO-1 SH3-GUK domain confirms that the interdependent folding of the SH3 and GUK domains is a conserved feature of MAGUKs, but differences in the orientation of the GUK domains in three different MAGUKs reveal interdomain flexibility of the core unit. Using pull-down assays, we show that an effector loop, the U6 region in ZO-1, forms a novel intramolecular interaction with the core module. This interaction is divalent cation-dependent and overlaps with the binding site for the regulatory molecule calmodulin on the GUK domain. These findings provide insight into the previously observed ability of the U6 region to regulate TJ assembly in vivo and the structural basis for the complex protein interactions of the MAGUK family.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Genetics, University of Illinois, Chicago, Illinois 60607, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tight junction protein ZO-1251Homo sapiensMutation(s): 0 
Gene Names: TJP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q07157 (Homo sapiens)
Explore Q07157 
Go to UniProtKB:  Q07157
PHAROS:  Q07157
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ07157
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.213 
  • Space Group: P 64
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.8α = 90
b = 125.8β = 90
c = 35.6γ = 120
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-03-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-08-23
    Changes: Refinement description, Source and taxonomy