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
  • Primary Citation of Related Structures:  
    6BQN

  • 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 present the structure of human ENaC in the uncleaved state determined by single-particle cryo-electron microscopy ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SCNN1AA489Homo sapiensMutation(s): 0 
Gene Names: SCNN1ASCNN1
Membrane Entity: Yes 
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Find proteins for P37088 (Homo sapiens)
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Go to UniProtKB:  P37088
PHAROS:  P37088
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
SCNN1BB495Homo sapiensMutation(s): 0 
Gene Names: SCNN1B
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P51168 (Homo sapiens)
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PHAROS:  P51168
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
EGFP-SCNN1G chimeraC503Homo sapiensMutation(s): 0 
Gene Names: SCNN1G
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P51170 (Homo sapiens)
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PHAROS:  P51170
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
7B1 fabD106Mus musculusMutation(s): 0 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
7B1 fabE121Mus musculusMutation(s): 0 
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
10D4 fabF115Mus musculusMutation(s): 0 
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
10D4 fabG112Mus musculusMutation(s): 0 
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Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History & Funding Information

Deposition Data


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

Revision History  (Full details and data files)

  • 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