1XMJ

Crystal structure of human deltaF508 human NBD1 domain with ATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.248 

Starting Model: experimental
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This is version 1.6 of the entry. See complete history


Literature

Impact of the delta-F508 Mutation in First Nucleotide-binding Domain of Human Cystic Fibrosis Transmembrane Conductance Regulator on Domain Folding and Structure

Lewis, H.A.Zhao, X.Wang, C.Sauder, J.M.Rooney, I.Noland, B.W.Lorimer, D.Kearins, M.C.Conners, K.Condon, B.Maloney, P.C.Guggino, W.B.Hunt, J.F.Emtage, S.

(2005) J Biol Chem 280: 1346-1353

  • DOI: https://doi.org/10.1074/jbc.M410968200
  • Primary Citation of Related Structures:  
    1XMI, 1XMJ

  • PubMed Abstract: 

    Cystic fibrosis is caused by defects in the cystic fibrosis transmembrane conductance regulator (CFTR), commonly the deletion of residue Phe-508 (DeltaF508) in the first nucleotide-binding domain (NBD1), which results in a severe reduction in the population of functional channels at the epithelial cell surface. Previous studies employing incomplete NBD1 domains have attributed this to aberrant folding of DeltaF508 NBD1. We report structural and biophysical studies on complete human NBD1 domains, which fail to demonstrate significant changes of in vitro stability or folding kinetics in the presence or absence of the DeltaF508 mutation. Crystal structures show minimal changes in protein conformation but substantial changes in local surface topography at the site of the mutation, which is located in the region of NBD1 believed to interact with the first membrane spanning domain of CFTR. These results raise the possibility that the primary effect of DeltaF508 is a disruption of proper interdomain interactions at this site in CFTR rather than interference with the folding of NBD1. Interestingly, increases in the stability of NBD1 constructs are observed upon introduction of second-site mutations that suppress the trafficking defect caused by the DeltaF508 mutation, suggesting that these suppressors might function indirectly by improving the folding efficiency of NBD1 in the context of the full-length protein. The human NBD1 structures also solidify the understanding of CFTR regulation by showing that its two protein segments that can be phosphorylated both adopt multiple conformations that modulate access to the ATPase active site and functional interdomain interfaces.


  • Organizational Affiliation

    Structural GenomiX, Inc., San Diego, California 92121, USA. hal_lewis@stromix.com


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cystic fibrosis transmembrane conductance regulator290Homo sapiensMutation(s): 7 
Gene Names: CFTR
EC: 3.6.3.49 (PDB Primary Data), 5.6.1.6 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P13569 (Homo sapiens)
Explore P13569 
Go to UniProtKB:  P13569
PHAROS:  P13569
GTEx:  ENSG00000001626 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13569
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.248 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.793α = 90
b = 59.793β = 90
c = 144.398γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALEdata reduction
TRUNCATEdata reduction
MOLREPphasing
REFMACrefinement
SCALEdata scaling
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-09
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-11-14
    Changes: Data collection, Structure summary
  • Version 1.4: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.5: 2024-02-14
    Changes: Data collection
  • Version 1.6: 2024-04-03
    Changes: Refinement description