Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 29.05 kDa 
• Atom Count: 2099 
• Residue Count: 248 
• Unique protein chains: 1

3LH5

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

• DOI: 10.2210/pdb3LH5/pdb

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-01-21 Released: 2010-03-02 
• Deposition Author(s): Lye, M.F., Lavie, A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.285 
• R-Value Work: 0.205 
• R-Value Observed: 0.213 

Literature

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

• PubMed: 20200156 
• DOI: 10.1074/jbc.M109.093674
• Primary Citation of Related Structures:  
  3LH5


• 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.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tight junction protein ZO-1	A	251	Homo sapiens	Mutation(s): 0  Gene Names: TJP1
Find proteins for Q07157 (Homo sapiens) Explore Q07157  Go to UniProtKB:  Q07157
NIH Common Fund Data Resources
PHAROS:  Q07157 GTEx:  ENSG00000104067

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• 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 = 125.8	α = 90
b = 125.8	β = 90
c = 35.6	γ = 120

Software Package:

Software Name	Purpose
XSCALE	data scaling
SOLVE	phasing
RESOLVE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data scaling
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-01-21 
• Released Date: 2010-03-02 
Deposition Author(s): Lye, M.F., Lavie, A.

Revision History 

• 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