1Q3P

Crystal structure of the Shank PDZ-ligand complex reveals a class I PDZ interaction and a novel PDZ-PDZ dimerization


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.251 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Crystal structure of the Shank PDZ-ligand complex reveals a class I PDZ interaction and a novel PDZ-PDZ dimerization

Im, Y.J.Lee, J.H.Park, S.H.Park, S.J.Rho, S.-H.Kang, G.B.Kim, E.Eom, S.H.

(2003) J Biol Chem 278: 48099-48104

  • DOI: https://doi.org/10.1074/jbc.M306919200
  • Primary Citation of Related Structures:  
    1Q3O, 1Q3P

  • PubMed Abstract: 

    The Shank/proline-rich synapse-associated protein family of multidomain proteins is known to play an important role in the organization of synaptic multiprotein complexes. For instance, the Shank PDZ domain binds to the C termini of guanylate kinase-associated proteins, which in turn interact with the guanylate kinase domain of postsynaptic density-95 scaffolding proteins. Here we describe the crystal structures of Shank1 PDZ in its peptide free form and in complex with the C-terminal hexapeptide (EAQTRL) of guanylate kinase-associated protein (GKAP1a) determined at 1.8- and 2.25-A resolutions, respectively. The structure shows the typical class I PDZ interaction of PDZ-peptide complex with the consensus sequence -X-(Thr/Ser)-X-Leu. In addition, Asp-634 within the Shank1 PDZ domain recognizes the positively charged Arg at -1 position and hydrogen bonds, and salt bridges between Arg-607 and the side chains of the ligand at -3 and -5 positions contribute further to the recognition of the peptide ligand. Remarkably, whether free or complexed, Shank1 PDZ domains form dimers with a conserved beta B/beta C loop and N-terminal beta A strands, suggesting a novel model of PDZ-PDZ homodimerization. This implies that antiparallel dimerization through the N-terminal beta A strands could be a common configuration among PDZ dimers. Within the dimeric structure, the two-peptide binding sites are arranged so that the N termini of the bound peptide ligands are in close proximity and oriented toward the 2-fold axis of the dimer. This configuration may provide a means of facilitating dimeric organization of PDZ-target assemblies.


  • Organizational Affiliation

    Department of Life Science, Kwangju Institute of Science and Technology, Gwangju 500-712, South Korea.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Shank1
A, B
109Rattus norvegicusMutation(s): 0 
Gene Names: shank1
UniProt
Find proteins for Q9WV48 (Rattus norvegicus)
Explore Q9WV48 
Go to UniProtKB:  Q9WV48
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9WV48
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
C-terminal hexapeptide from Guanylate kinase-associated protein
C, D
6N/AMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.251 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.763α = 90
b = 60.763β = 90
c = 157.902γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-27
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Refinement description