7SX3

Human NALCN-FAM155A-UNC79-UNC80 channelosome with CaM bound, conformation 1/2


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 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: 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 ...

    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 . Since fundamental aspects about the composition, assembly, and gating of the NALCN channelosome remain obscure, we determined the structure of this ~1 megadalton complex. 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 are identified that lead to a model of channelosome gating. Our results provide a structural blueprint to understand NALCN channelosome physiology and a template for drug discovery to modulate the resting membrane potential.


    Organizational Affiliation

    Department of Proteomics and Bioinformatics, Interline Therapeutics, South San Francisco, CA, 94080, USA. jpayandeh@interlinetx.com.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Sodium leak channel non-selective protein,Enhanced green fluorescent proteinA2042Homo sapiensMutation(s): 0 
Gene Names: NALCNVGCNL1eGFP
Membrane Entity: Yes 
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Find proteins for Q8IZF0 (Homo sapiens)
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Go to UniProtKB:  Q8IZF0
PHAROS:  Q8IZF0
GTEx:  ENSG00000102452 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ8IZF0A0A7G8ZY66
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Transmembrane protein FAM155AB483Homo sapiensMutation(s): 0 
Gene Names: FAM155A
Membrane Entity: Yes 
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Find proteins for B1AL88 (Homo sapiens)
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PHAROS:  B1AL88
GTEx:  ENSG00000204442 
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UniProt GroupB1AL88
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin-1C149Homo sapiensMutation(s): 0 
Gene Names: CALM1CALMCAMCAM1
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PHAROS:  P0DP23
GTEx:  ENSG00000198668 
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UniProt GroupP0DP23
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
UNC79,Protein unc-79 homolog,Protein unc-79 homologD2561Homo sapiensMutation(s): 0 
Gene Names: UNC79KIAA1409
Membrane Entity: Yes 
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PHAROS:  Q9P2D8
GTEx:  ENSG00000133958 
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UniProt GroupQ9P2D8
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Protein unc-80 homologE3283Homo sapiensMutation(s): 0 
Gene Names: UNC80C2orf21KIAA1843
Membrane Entity: Yes 
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PHAROS:  Q8N2C7
GTEx:  ENSG00000144406 
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UniProt GroupQ8N2C7
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Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PGV
Query on PGV

Download Ideal Coordinates CCD File 
L [auth A],
M [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
 Ligand Interaction
PEV
Query on PEV

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H [auth A],
I [auth A],
J [auth A],
K [auth A]
(1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE
C39 H78 N O8 P
RPJZYOHZALDGKI-QNGWXLTQSA-N
 Ligand Interaction
Y01
Query on Y01

Download Ideal Coordinates CCD File 
N [auth A],
O [auth A],
P [auth A]
CHOLESTEROL HEMISUCCINATE
C31 H50 O4
WLNARFZDISHUGS-MIXBDBMTSA-N
 Ligand Interaction
NAG
Query on NAG

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F [auth A],
G [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TYS
Query on TYS
A L-PEPTIDE LINKINGC9 H11 N O6 STYR
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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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