6RQR

Extended NHERF1 PDZ2 domain in complex with the PDZ-binding motif of CFTR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.211 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

In vivocrystals reveal critical features of the interaction between cystic fibrosis transmembrane conductance regulator (CFTR) and the PDZ2 domain of Na+/H+exchange cofactor NHERF1.

Martin, E.R.Barbieri, A.Ford, R.C.Robinson, R.C.

(2020) J Biol Chem 295: 4464-4476

  • DOI: 10.1074/jbc.RA119.012015
  • Primary Citation of Related Structures:  
    6RQR

  • PubMed Abstract: 
  • Crystallization of recombinant proteins has been fundamental to our understanding of protein function, dysfunction, and molecular recognition. However, this information has often been gleaned under extremely nonphysiological protein, salt, and H + concentrations ...

    Crystallization of recombinant proteins has been fundamental to our understanding of protein function, dysfunction, and molecular recognition. However, this information has often been gleaned under extremely nonphysiological protein, salt, and H + concentrations. Here, we describe the development of a robust Inka1-Box (iBox)-PAK4cat system that spontaneously crystallizes in several mammalian cell types. The semi-quantitative assay described here allows the measurement of in vivo protein-protein interactions using a novel GFP-linked reporter system that produces fluorescent readouts from protein crystals. We combined this assay with in vitro X-ray crystallography and molecular dynamics studies to characterize the molecular determinants of the interaction between the PDZ2 domain of Na + /H + exchange regulatory cofactor NHE-RF1 (NHERF1) and cystic fibrosis transmembrane conductance regulator (CFTR), a protein complex pertinent to the genetic disease cystic fibrosis. These experiments revealed the crystal structure of the extended PDZ domain of NHERF1 and indicated, contrary to what has been previously reported, that residue selection at positions -1 and -3 of the PDZ-binding motif influences the affinity and specificity of the NHERF1 PDZ2-CFTR interaction. Our results suggest that this system could be utilized to screen additional protein-protein interactions, provided they can be accommodated within the spacious iBox-PAK4cat lattice.


    Organizational Affiliation

    Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Na(+)/H(+) exchange regulatory cofactor NHE-RF1,Cystic fibrosis transmembrane conductance regulatorA, B144Homo sapiensMutation(s): 0 
Gene Names: SLC9A3R1NHERFNHERF1CFTRABCC7
EC: 5.6.1.6
UniProt & NIH Common Fund Data Resources
Find proteins for P13569 (Homo sapiens)
Explore P13569 
Go to UniProtKB:  P13569
PHAROS:  P13569
Find proteins for O14745 (Homo sapiens)
Explore O14745 
Go to UniProtKB:  O14745
PHAROS:  O14745
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.211 
  • Space Group: I 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.95α = 90
b = 85.039β = 90
c = 89.58γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-05
    Type: Initial release
  • Version 1.1: 2020-04-29
    Changes: Database references