3CYY

The crystal structure of ZO-1 PDZ2 in complex with the Cx43 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Domain-swapped dimerization of ZO-1 PDZ2 generates specific and regulatory connexin43-binding sites

Chen, J.Pan, L.Wei, Z.Zhao, Y.Zhang, M.

(2008) Embo J. 27: 2113-2123

  • DOI: 10.1038/emboj.2008.138

  • PubMed Abstract: 
  • PDZ domain scaffold proteins are capable of assembling macromolecular protein complexes in diverse cellular processes through PDZ-mediated binding to a short peptide fragment at the carboxyl tail of target proteins. How each PDZ domain specifically r ...

    PDZ domain scaffold proteins are capable of assembling macromolecular protein complexes in diverse cellular processes through PDZ-mediated binding to a short peptide fragment at the carboxyl tail of target proteins. How each PDZ domain specifically recognizes its target protein(s) remains a major conceptual question, as at least a few out of the several hundred PDZ domains in each eukaryotic genome share overlapping binding properties with any given target protein. Here, we show that the domain-swapped dimerization of zonula occludens-1 PDZ2 generates a distinct interface that functions together with the well-separated canonical carboxyl tail-binding pocket in each PDZ unit in binding to connexin43 (Cx43). We further demonstrate that the charge-charge interaction network formed by residues in the PDZ dimer interface and upstream residues of the Cx43 peptide not only provides the unprecedented interaction specificity for the complex but may also function as a phosphorylation-mediated regulatory switch for the dynamics of the Cx43 gap junctions. Finally, we provide evidence that such domain-swapped dimer assembly also occurs in other PDZ domain scaffold proteins. Therefore, our findings present a new paradigm for understanding how some PDZ domain proteins specifically bind to and regulate the functions of their target proteins.


    Organizational Affiliation

    Department of Biochemistry, Molecular Neuroscience Center, Hong Kong University of Science and Technology, Kowloon, Hong Kong.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tight junction protein ZO-1
A, B
92Homo sapiensMutation(s): 1 
Gene Names: TJP1 (ZO1)
Find proteins for Q07157 (Homo sapiens)
Go to Gene View: TJP1
Go to UniProtKB:  Q07157
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
peptide from Gap junction alpha-1 protein
C, D
9Rattus norvegicusMutation(s): 0 
Gene Names: Gja1 (Cxn-43)
Find proteins for P08050 (Rattus norvegicus)
Go to UniProtKB:  P08050
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.215 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 41.040α = 90.00
b = 68.140β = 90.00
c = 149.690γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata collection
PHASESphasing
MOSFLMdata reduction
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-04-27 
  • Released Date: 2008-09-23 
  • Deposition Author(s): Pan, L., Zhang, M.

Revision History 

  • Version 1.0: 2008-09-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance