3TSV image
Deposition Date 2011-09-13
Release Date 2011-10-12
Last Version Date 2023-09-13
Entry Detail
PDB ID:
3TSV
Keywords:
Title:
crystal structure of the third PDZ domain of the human ZO-1 MAGUK protein
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.99 Å
R-Value Free:
0.31
R-Value Work:
0.26
R-Value Observed:
0.27
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Tight junction protein ZO-1
Gene (Uniprot):TJP1
Chain IDs:A
Chain Length:124
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
The Src Homology 3 Domain Is Required for Junctional Adhesion Molecule Binding to the Third PDZ Domain of the Scaffolding Protein ZO-1.
J.Biol.Chem. 286 43352 43360 (2011)
PMID: 22030391 DOI: 10.1074/jbc.M111.304089

Abstact

Tight junctions are cell-cell contacts that regulate the paracellular flux of solutes and prevent pathogen entry across cell layers. The assembly and permeability of this barrier are dependent on the zonula occludens (ZO) membrane-associated guanylate kinase (MAGUK) proteins ZO-1, -2, and -3. MAGUK proteins are characterized by a core motif of protein-binding domains that include a PDZ domain, a Src homology 3 (SH3) domain, and a region of homology to guanylate kinase (GUK); the structure of this core motif has never been determined for any MAGUK. To better understand how ZO proteins organize the assembly of protein complexes we have crystallized the entire PDZ3-SH3-GUK core motif of ZO-1. We have also crystallized this core motif in complex with the cytoplasmic tail of the ZO-1 PDZ3 ligand, junctional adhesion molecule A (JAM-A) to determine how the activity of different domains is coordinated. Our study shows a new feature for PDZ class II ligand binding that implicates the two highly conserved Phe(-2) and Ser(-3) residues of JAM. Our x-ray structures and NMR experiments also show for the first time a role for adjacent domains in the binding of ligands to PDZ domains in the MAGUK proteins family.

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