Structural Determinants of the NHERF Interaction with beta2-AR and PDGFR

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.225 

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Structural Determinants of the Na+/H+ Exchanger Regulatory Factor Interaction with the Beta 2 Adrenergic and Platelet-Derived Growth Factor Receptors

Karthikeyan, S.Leung, T.Ladias, J.A.A.

(2002) J Biol Chem 277: 18973

  • DOI: https://doi.org/10.1074/jbc.M201507200
  • Primary Citation of Related Structures:  
    1GQ4, 1GQ5

  • PubMed Abstract: 

    The Na(+)/H(+) exchanger regulatory factor (NHERF) binds through its PDZ1 domain to the carboxyl-terminal sequences NDSLL and EDSFL of the beta(2) adrenergic receptor (beta(2)AR) and platelet-derived growth factor receptor, respectively, and plays a critical role in the membrane localization and physiological regulation of these receptors. The crystal structures of the human NHERF PDZ1 domain bound to the sequences NDSLL and EDSFL have been determined at 1.9- and 2.2-A resolution, respectively. The beta(2)AR and platelet-derived growth factor receptor ligands insert into the PDZ1 binding pocket by a beta-sheet augmentation process and are stabilized by largely similar networks of hydrogen bonds and hydrophobic contacts. In the PDZ1-beta(2)AR complex, the side chain of asparagine at position -4 in the beta(2)AR peptide forms two additional hydrogen bonds with Gly(30) of PDZ1, which contribute to the higher affinity of this interaction. Remarkably, both complexes are further stabilized by hydrophobic interactions involving the side chains of the penultimate amino acids of the peptide ligands, whereas the PDZ1 residues Asn(22) and Glu(43) undergo conformational changes to accommodate these side chains. These results provide structural insights into the mechanisms by which different side chains at the position -1 of peptide ligands interact with PDZ domains and contribute to the affinity of the PDZ-ligand interaction.

  • Organizational Affiliation

    Molecular Medicine Laboratory and Macromolecular Crystallography Unit, Division of Experimental Medicine, Harvard Institutes of Medicine, Harvard Medical School, Boston, Massachusetts 02115, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UniProt & NIH Common Fund Data Resources
Find proteins for O14745 (Homo sapiens)
Explore O14745 
Go to UniProtKB:  O14745
PHAROS:  O14745
GTEx:  ENSG00000109062 
Entity Groups  
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UniProt GroupO14745
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.225 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.073α = 90
b = 50.073β = 90
c = 66.68γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-11-14
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description