1I92

STRUCTURAL BASIS OF THE NHERF PDZ1-CFTR INTERACTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.3 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: 10.1074/jbc.C100154200
  • Also Cited By: 1GQ5, 1GQ4

  • 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 loc ...

    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.


    Related Citations: 
    • Crystal Structure of the PDZ1 Domain of Human Na+/H+ Exchanger Regulatory Factor Provides Insights into the Mechanism of Carboxyl-terminal Leucine Recognition by Class I PDZ Domains
      Karthikeyan, S.,Leung, T.,Birrane, G.,Webster, G.,Ladias, J.A.A.
      (2001) J.Mol.Biol. 308: 963
    • Peptide Binding Consensus of the NHE-RF-PDZ1 Domain Matches the C-terminal Sequence of Cystic Fibrosis Transmembrane Conductance Regulator (CFTR)
      Wang, S.,W Raab, R.,Schatz, P.J.,Guggino, W.B.,Li, M.
      (1998) FEBS Lett. 427: 103
    • NHE-RF, A Regulatory Cofactor for NA(+)-H+ Exchange, is a Common Interactor for Merlin and ERM (MERM) Proteins
      Murthy, A.,Gonzalez-Agosti, C.,Cordero, E.,Pinney, D.,Candia, C.,Solomon, F.,Gusella, J.,Ramesh, V.
      (1998) J.Biol.Chem. 273: 1273
    • A C-terminal Motif Found in the Beta2-Adrenergic Receptor, P2Y1 Receptor and Cystic Fibrosis Transmembrane Conductance Regulator Determines Binding to the Na+/H+ Exchanger Regulatory Factor Family of PDZ Proteins
      Hall, R.A.,Ostedgaard, L.S.,Premont, R.T.,Blitzer, J.T.,Rahman, N.,Welsh, M.J.,Lefkowitz, R.J.
      (1998) Proc.Natl.Acad.Sci.USA 95: 8496


    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NA+/H+ EXCHANGE REGULATORY CO-FACTOR
A
91Homo sapiensMutation(s): 0 
Gene Names: SLC9A3R1 (NHERF, NHERF1)
Find proteins for O14745 (Homo sapiens)
Go to Gene View: SLC9A3R1
Go to UniProtKB:  O14745
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.187 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 51.658α = 90.00
b = 51.658β = 90.00
c = 66.966γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
DENZOdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-06-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-08-16
    Type: Refinement description, Source and taxonomy