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 

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This is version 1.2 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: 10.1074/jbc.M306919200
  • Primary Citation of Related Structures:  

  • 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- ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Shank1
A, B
109Rattus norvegicusMutation(s): 0 
Gene Names: Shank1
Find proteins for Q9WV48 (Rattus norvegicus)
Go to UniProtKB:  Q9WV48
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
C-terminal hexapeptide from Guanylate kinase-associated protein
C, D
6N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.251 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 60.763α = 90.00
b = 60.763β = 90.00
c = 157.902γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-01-27
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance