6BQN

Cryo-EM structure of ENaC


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the human epithelial sodium channel by cryo-electron microscopy.

Noreng, S.Bharadwaj, A.Posert, R.Yoshioka, C.Baconguis, I.

(2018) Elife 7

  • DOI: 10.7554/eLife.39340
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The epithelial sodium channel (ENaC), a member of the ENaC/DEG superfamily, regulates Na + and water homeostasis. ENaCs assemble as heterotrimeric channels that harbor protease-sensitive domains critical for gating the channel. Here, we p ...

    The epithelial sodium channel (ENaC), a member of the ENaC/DEG superfamily, regulates Na + and water homeostasis. ENaCs assemble as heterotrimeric channels that harbor protease-sensitive domains critical for gating the channel. Here, we present the structure of human ENaC in the uncleaved state determined by single-particle cryo-electron microscopy. The ion channel is composed of a large extracellular domain and a narrow transmembrane domain. The structure reveals that ENaC assembles with a 1:1:1 stoichiometry of α:β:γ subunits arranged in a counter-clockwise manner. The shape of each subunit is reminiscent of a hand with key gating domains of a 'finger' and a 'thumb.' Wedged between these domains is the elusive protease-sensitive inhibitory domain poised to regulate conformational changes of the 'finger' and 'thumb'; thus, the structure provides the first view of the architecture of inhibition of ENaC.


    Organizational Affiliation

    Vollum Institute, Oregon Health and Science University, Portland, United States.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SCNN1A
A
489Homo sapiensMutation(s): 0 
Gene Names: SCNN1ASCNN1
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Other Ion Channels
Protein: 
epithelial sodium channel ENaC
Find proteins for P37088 (Homo sapiens)
Go to UniProtKB:  P37088
NIH Common Fund Data Resources
PHAROS  P37088

Find similar proteins by: Sequence  |  Structure

Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
10D4 fab
F
115Mus musculusMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SCNN1B
B
495Homo sapiensMutation(s): 0 
Gene Names: SCNN1B
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Other Ion Channels
Protein: 
epithelial sodium channel ENaC
Find proteins for P51168 (Homo sapiens)
Go to UniProtKB:  P51168
NIH Common Fund Data Resources
PHAROS  P51168

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
EGFP-SCNN1G chimera
C
503Homo sapiensMutation(s): 0 
Gene Names: SCNN1G
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Other Ion Channels
Protein: 
epithelial sodium channel ENaC
Find proteins for P51170 (Homo sapiens)
Go to UniProtKB:  P51170
NIH Common Fund Data Resources
PHAROS  P51170

Find similar proteins by: Sequence  |  Structure

Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
7B1 fab
D
106Mus musculusMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.

Find similar proteins by: Sequence  |  Structure

Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
7B1 fab
E
121Mus musculusMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.

Find similar proteins by: Sequence  |  Structure

Entity ID: 7
MoleculeChainsSequence LengthOrganismDetails
10D4 fab
G
112Mus musculusMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/Office of the DirectorUnited States--

Revision History 

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2018-10-24
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence, Other