7SX4

Human NALCN-FAM155A-UNC79-UNC80 channelosome with CaM bound, conformation 2/2


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 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

Structural architecture of the human NALCN channelosome.

Kschonsak, M.Chua, H.C.Weidling, C.Chakouri, N.Noland, C.L.Schott, K.Chang, T.Tam, C.Patel, N.Arthur, C.P.Leitner, A.Ben-Johny, M.Ciferri, C.Pless, S.A.Payandeh, J.

(2022) Nature 603: 180-186

  • DOI: https://doi.org/10.1038/s41586-021-04313-5
  • Primary Citation of Related Structures:  
    7SX3, 7SX4

  • PubMed Abstract: 

    Depolarizing sodium (Na + ) leak currents carried by the NALCN channel regulate the resting membrane potential of many neurons to modulate respiration, circadian rhythm, locomotion and pain sensitivity 1-8 . NALCN requires FAM155A, UNC79 and UNC80 to function, but the role of these auxiliary subunits is not understood 3,7,9-12 . NALCN, UNC79 and UNC80 are essential in rodents 2,9,13 , and mutations in human NALCN and UNC80 cause severe developmental and neurological disease 14,15 . Here we determined the structure of the NALCN channelosome, an approximately 1-MDa complex, as fundamental aspects about the composition, assembly and gating of this channelosome remain obscure. UNC79 and UNC80 are massive HEAT-repeat proteins that form an intertwined anti-parallel superhelical assembly, which docks intracellularly onto the NALCN-FAM155A pore-forming subcomplex. Calmodulin copurifies bound to the carboxy-terminal domain of NALCN, identifying this region as a putative modulatory hub. Single-channel analyses uncovered a low open probability for the wild-type complex, highlighting the tightly closed S6 gate in the structure, and providing a basis to interpret the altered gating properties of disease-causing variants. Key constraints between the UNC79-UNC80 subcomplex and the NALCN DI-DII and DII-DIII linkers were identified, leading to a model of channelosome gating. Our results provide a structural blueprint to understand the physiology of the NALCN channelosome and a template for drug discovery to modulate the resting membrane potential.


  • Organizational Affiliation

    Department of Structural Biology, Genentech Inc., South San Francisco, CA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sodium leak channel non-selective protein,Enhanced green fluorescent protein2,042Homo sapiensMutation(s): 0 
Gene Names: NALCNVGCNL1eGFP
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IZF0 (Homo sapiens)
Explore Q8IZF0 
Go to UniProtKB:  Q8IZF0
PHAROS:  Q8IZF0
GTEx:  ENSG00000102452 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IZF0
Glycosylation
Glycosylation Sites: 1Go to GlyGen: Q8IZF0-1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Transmembrane protein FAM155A483Homo sapiensMutation(s): 0 
Gene Names: FAM155A
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for B1AL88 (Homo sapiens)
Explore B1AL88 
Go to UniProtKB:  B1AL88
PHAROS:  B1AL88
GTEx:  ENSG00000204442 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB1AL88
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Calmodulin-1149Homo sapiensMutation(s): 0 
Gene Names: CALM1CALMCAMCAM1
UniProt & NIH Common Fund Data Resources
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
PHAROS:  P0DP23
GTEx:  ENSG00000198668 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DP23
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
UNC79,Protein unc-79 homolog2,561Homo sapiensMutation(s): 0 
Gene Names: UNC79KIAA1409
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9P2D8 (Homo sapiens)
Explore Q9P2D8 
Go to UniProtKB:  Q9P2D8
PHAROS:  Q9P2D8
GTEx:  ENSG00000133958 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9P2D8
Sequence Annotations
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  • Reference Sequence
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Protein unc-80 homolog3,283Homo sapiensMutation(s): 0 
Gene Names: UNC80C2orf21KIAA1843
Membrane Entity: Yes 
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Find proteins for Q8N2C7 (Homo sapiens)
Explore Q8N2C7 
Go to UniProtKB:  Q8N2C7
PHAROS:  Q8N2C7
GTEx:  ENSG00000144406 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8N2C7
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PGV
Query on PGV

Download Ideal Coordinates CCD File 
I [auth A](1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE
C40 H77 O10 P
ADYWCMPUNIVOEA-GPJPVTGXSA-N
PEV
Query on PEV

Download Ideal Coordinates CCD File 
H [auth A](1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE
C39 H78 N O8 P
RPJZYOHZALDGKI-QNGWXLTQSA-N
Y01
Query on Y01

Download Ideal Coordinates CCD File 
J [auth A],
K [auth A],
L [auth A]
CHOLESTEROL HEMISUCCINATE
C31 H50 O4
WLNARFZDISHUGS-MIXBDBMTSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
TYS
Query on TYS
A
L-PEPTIDE LINKINGC9 H11 N O6 STYR
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcisTEM1.02

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2021-12-29
    Type: Initial release
  • Version 1.1: 2022-03-16
    Changes: Database references
  • Version 1.2: 2024-10-16
    Changes: Data collection, Structure summary