1I92

STRUCTURAL BASIS OF THE NHERF PDZ1-CFTR INTERACTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structural basis of the Na+/H+ exchanger regulatory factor PDZ1 interaction with the carboxyl-terminal region of the cystic fibrosis transmembrane conductance regulator.

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

(2001) J Biol Chem 276: 19683-19686

  • DOI: https://doi.org/10.1074/jbc.C100154200
  • Primary Citation of Related Structures:  
    1I92

  • PubMed Abstract: 

    The PDZ1 domain of the Na(+)/H(+) exchanger regulatory factor (NHERF) binds with nanomolar affinity to the carboxyl-terminal sequence QDTRL of the cystic fibrosis transmembrane conductance regulator (CFTR) and plays a central role in the cellular localization and physiological regulation of this chloride channel. The crystal structure of human NHERF PDZ1 bound to the carboxyl-terminal peptide QDTRL has been determined at 1.7-A resolution. The structure reveals the specificity and affinity determinants of the PDZ1-CFTR interaction and provides insights into carboxyl-terminal leucine recognition by class I PDZ domains. The peptide ligand inserts into the PDZ1 binding pocket forming an additional antiparallel beta-strand to the PDZ1 beta-sheet, and an extensive network of hydrogen bonds and hydrophobic interactions stabilize the complex. Remarkably, the guanido group of arginine at position -1 of the CFTR peptide forms two salt bridges and two hydrogen bonds with PDZ1 residues Glu(43) and Asn(22), respectively, providing the structural basis for the contribution of the penultimate amino acid of the peptide ligand to the affinity of the 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.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NA+/H+ EXCHANGE REGULATORY CO-FACTOR91Homo sapiensMutation(s): 0 
Gene Names: NHERF
UniProt & NIH Common Fund Data Resources
Find proteins for O14745 (Homo sapiens)
Explore O14745 
Go to UniProtKB:  O14745
PHAROS:  O14745
GTEx:  ENSG00000109062 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14745
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.191 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.658α = 90
b = 51.658β = 90
c = 66.966γ = 120
Software Package:
Software NamePurpose
MOLREPphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-06-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-08-16
    Changes: Refinement description, Source and taxonomy
  • Version 1.4: 2023-08-09
    Changes: Data collection, Database references, Derived calculations, Refinement description