High resolution crystal structure of the unliganded ZO-1 PDZ1 domain

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structural Basis of a Key Factor Regulating the Affinity between the Zonula Occludens First PDZ Domain and Claudins.

Nomme, J.Antanasijevic, A.Caffrey, M.Van Itallie, C.M.Anderson, J.M.Fanning, A.S.Lavie, A.

(2015) J Biol Chem 290: 16595-16606

  • DOI: https://doi.org/10.1074/jbc.M115.646695
  • Primary Citation of Related Structures:  
    4OEO, 4OEP, 4YYX

  • PubMed Abstract: 

    The molecular seal between epithelial cells, called the tight junction (TJ), is built by several membrane proteins, with claudins playing the most prominent role. The scaffold proteins of the zonula occludens family are required for the correct localization of claudins and hence formation of the TJ. The intracellular C terminus of claudins binds to the N-terminal PDZ domain of zonula occludens proteins (PDZ1). Of the 23 identified human claudin proteins, nine possess a tyrosine at the -6 position. Here we show that the claudin affinity for PDZ1 is dependent on the presence or absence of this tyrosine and that the affinity is reduced if the tyrosine is modified by phosphorylation. The PDZ1 β2-β3 loop undergoes a significant conformational change to accommodate this tyrosine. Cell culture experiments support a regulatory role for this tyrosine. Plasticity has been recognized as a critical property of TJs that allow cell remodeling and migration. Our work provides a molecular framework for how TJ plasticity may be regulated.

  • Organizational Affiliation

    Laboratory of Tight Junction Structure and Function, NHLBI, National Institutes of Health, Bethesda, Maryland 20892, and.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tight junction protein ZO-1
A, B, C
107Homo sapiensMutation(s): 0 
Gene Names: TJP1ZO1
UniProt & NIH Common Fund Data Resources
Find proteins for Q07157 (Homo sapiens)
Explore Q07157 
Go to UniProtKB:  Q07157
PHAROS:  Q07157
GTEx:  ENSG00000104067 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ07157
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.993α = 90
b = 60.473β = 124.26
c = 62.217γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-14
    Type: Initial release
  • Version 1.1: 2015-07-01
    Changes: Database references
  • Version 1.2: 2015-07-22
    Changes: Database references