9BLR

Human SCNN1D-SCNN1B-SCNN1G ENaC trimer

  • Classification: MEMBRANE PROTEIN
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens
  • Mutation(s): Yes 

  • Deposited: 2024-05-01 Released: 2024-11-27 
  • Deposition Author(s): Houser, A., Baconguis, I.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Cystic Fibrosis Foundation, National Science Foundation (NSF, United States)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.38 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insights into subunit-dependent functional regulation in epithelial sodium channels.

Houser, A.Baconguis, I.

(2024) Structure 

  • DOI: https://doi.org/10.1016/j.str.2024.11.013
  • Primary Citation of Related Structures:  
    9BLR, 9BTG, 9BTU

  • PubMed Abstract: 

    Epithelial sodium channels (ENaCs) play a crucial role in Na + reabsorption in mammals. To date, four subunits have been identified-α, β, γ, and δ-believed to form different heteromeric complexes. Currently, only the structure of the αβγ complex is known. To investigate the formation of channels with different subunit compositions and to determine how each subunit contributes to distinct channel properties, we co-expressed human δ, β, and γ. Using single-particle cryoelectron microscopy, we observed three distinct ENaC complexes. The structures unveil a pattern in which β and γ positions are conserved among the different complexes while the α position in αβγ trimer is occupied by either δ or another β. The δ subunit induces structural rearrangements in the γ subunit, which may contribute to the differences in channel activity between αβγ and δβγ channels. These structural changes provide molecular insights into how ENaC subunit composition modulates channel function.


  • Organizational Affiliation

    Neuroscience Graduate Program, Oregon Health & Science University, Portland, OR 97239, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Isoform 1 of Amiloride-sensitive sodium channel subunit delta638Homo sapiensMutation(s): 1 
Gene Names: SCNN1DDNACH
UniProt & NIH Common Fund Data Resources
Find proteins for P51172 (Homo sapiens)
Explore P51172 
Go to UniProtKB:  P51172
PHAROS:  P51172
GTEx:  ENSG00000162572 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP51172
Glycosylation
Glycosylation Sites: 1Go to GlyGen: P51172-3
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Amiloride-sensitive sodium channel subunit beta640Homo sapiensMutation(s): 1 
Gene Names: SCNN1B
UniProt & NIH Common Fund Data Resources
Find proteins for P51168 (Homo sapiens)
Explore P51168 
Go to UniProtKB:  P51168
PHAROS:  P51168
GTEx:  ENSG00000168447 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP51168
Glycosylation
Glycosylation Sites: 4Go to GlyGen: P51168-1
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Amiloride-sensitive sodium channel subunit gamma649Homo sapiensMutation(s): 3 
Gene Names: SCNN1G
UniProt & NIH Common Fund Data Resources
Find proteins for P51170 (Homo sapiens)
Explore P51170 
Go to UniProtKB:  P51170
PHAROS:  P51170
GTEx:  ENSG00000166828 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP51170
Glycosylation
Glycosylation Sites: 2Go to GlyGen: P51170-1
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseD [auth E],
F [auth D],
G [auth I]
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseE [auth G]2N/A
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.38 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC4.3.1
MODEL REFINEMENTISOLDE1.6
MODEL REFINEMENTPHENIX1.2

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1R01GM138862
Cystic Fibrosis FoundationUnited StatesBACONG22G0
National Science Foundation (NSF, United States)United StatesGVPRS0015B4

Revision History  (Full details and data files)

  • Version 1.0: 2024-11-27
    Type: Initial release
  • Version 1.1: 2024-12-25
    Changes: Data collection, Database references