6WTH

Full-length human ENaC ECD


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.06 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Molecular principles of assembly, activation, and inhibition in epithelial sodium channel.

Noreng, S.Posert, R.Bharadwaj, A.Houser, A.Baconguis, I.

(2020) Elife 9

  • DOI: 10.7554/eLife.59038
  • Primary Citation of Related Structures:  
    6WTH

  • PubMed Abstract: 
  • The molecular bases of heteromeric assembly and link between Na + self-inhibition and protease-sensitivity in epithelial sodium channels (ENaCs) are not fully understood. Previously, we demonstrated that ENaC subunits - α, β, and γ - assemble in a counterclockwise configuration when viewed from outside the cell with the protease-sensitive GRIP domains in the periphery (Noreng et al ...

    The molecular bases of heteromeric assembly and link between Na + self-inhibition and protease-sensitivity in epithelial sodium channels (ENaCs) are not fully understood. Previously, we demonstrated that ENaC subunits - α, β, and γ - assemble in a counterclockwise configuration when viewed from outside the cell with the protease-sensitive GRIP domains in the periphery (Noreng et al., 2018). Here we describe the structure of ENaC resolved by cryo-electron microscopy at 3 Å. We find that a combination of precise domain arrangement and complementary hydrogen bonding network defines the subunit arrangement. Furthermore, we determined that the α subunit has a primary functional module consisting of the finger and GRIP domains. The module is bifurcated by the α2 helix dividing two distinct regulatory sites: Na + and the inhibitory peptide. Removal of the inhibitory peptide perturbs the Na + site via the α2 helix highlighting the critical role of the α2 helix in regulating ENaC function.


    Organizational Affiliation

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Amiloride-sensitive sodium channel subunit alphaA669Homo sapiensMutation(s): 0 
Gene Names: SCNN1ASCNN1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P37088 (Homo sapiens)
Explore P37088 
Go to UniProtKB:  P37088
PHAROS:  P37088
Entity Groups  
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UniProt GroupP37088
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Amiloride-sensitive sodium channel subunit betaB640Homo sapiensMutation(s): 0 
Gene Names: SCNN1B
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P51168 (Homo sapiens)
Explore P51168 
Go to UniProtKB:  P51168
PHAROS:  P51168
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP51168
Protein Feature View
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Amiloride-sensitive sodium channel subunit gammaC649Homo sapiensMutation(s): 0 
Gene Names: SCNN1G
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P51170 (Homo sapiens)
Explore P51170 
Go to UniProtKB:  P51170
PHAROS:  P51170
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP51170
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
7B1 FabD, E118Mus musculusMutation(s): 0 
Protein Feature View
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
10D4 FabF, G115Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 6
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseH, I, J 2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
L [auth A],
M [auth A],
N [auth B],
O [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
NA (Subject of Investigation/LOI)
Query on NA

Download Ideal Coordinates CCD File 
K [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.06 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 StatesDP5OD017871
American Heart AssociationUnited States19TPA34760754
American Heart AssociationUnited States18PRE33990205
National Science Foundation (NSF, United States)United StatesDGE-1937961

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-12
    Type: Initial release