5UAK

Dephosphorylated, ATP-free human cystic fibrosis transmembrane conductance regulator (CFTR)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.87 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Molecular Structure of the Human CFTR Ion Channel.

Liu, F.Zhang, Z.Csanady, L.Gadsby, D.C.Chen, J.

(2017) Cell 169: 85-95.e8

  • DOI: 10.1016/j.cell.2017.02.024

  • PubMed Abstract: 
  • The cystic fibrosis transmembrane conductance regulator (CFTR) is an ATP-binding cassette (ABC) transporter that uniquely functions as an ion channel. Here, we present a 3.9 Å structure of dephosphorylated human CFTR without nucleotides, determined b ...

    The cystic fibrosis transmembrane conductance regulator (CFTR) is an ATP-binding cassette (ABC) transporter that uniquely functions as an ion channel. Here, we present a 3.9 Å structure of dephosphorylated human CFTR without nucleotides, determined by electron cryomicroscopy (cryo-EM). Close resemblance of this human CFTR structure to zebrafish CFTR under identical conditions reinforces its relevance for understanding CFTR function. The human CFTR structure reveals a previously unresolved helix belonging to the R domain docked inside the intracellular vestibule, precluding channel opening. By analyzing the sigmoid time course of CFTR current activation, we propose that PKA phosphorylation of the R domain is enabled by its infrequent spontaneous disengagement, which also explains residual ATPase and gating activity of dephosphorylated CFTR. From comparison with MRP1, a feature distinguishing CFTR from all other ABC transporters is the helix-loop transition in transmembrane helix 8, which likely forms the structural basis for CFTR's channel function.


    Organizational Affiliation

    Laboratory of Membrane Biophysics and Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA; Tri-Institutional Training Program in Chemical Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cystic fibrosis transmembrane conductance regulator
A
1489Homo sapiensMutation(s): 0 
Gene Names: CFTR (ABCC7)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) in dephosphorylated, ATP-free state
Find proteins for P13569 (Homo sapiens)
Go to Gene View: CFTR
Go to UniProtKB:  P13569
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cystic fibrosis transmembrane conductance regulator
R
19N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
R
L-PEPTIDE LINKINGC4 H9 N O2

--

Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.87 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-01-18
    Type: Initial release
  • Version 1.1: 2017-03-01
    Type: Other
  • Version 1.2: 2017-03-29
    Type: Database references
  • Version 1.3: 2017-04-12
    Type: Database references