7WJI

Architecture of the human NALCN channelosome


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Architecture of the human NALCN channelosome.

Zhou, L.Liu, H.Zhao, Q.Wu, J.Yan, Z.

(2022) Cell Discov 8: 33-33

  • DOI: 10.1038/s41421-022-00392-4
  • Primary Citation of Related Structures:  
    7WJI

  • PubMed Abstract: 
  • NALCN regulates the resting membrane potential by mediating the Na + leak current in neurons, and it functions as a channelosome in complex with FAM155A, UNC79, and UNC80. Dysfunction of the NALCN channelosome causes a broad range of neurological and developmental diseases called NALCN channelopathies in humans ...

    NALCN regulates the resting membrane potential by mediating the Na + leak current in neurons, and it functions as a channelosome in complex with FAM155A, UNC79, and UNC80. Dysfunction of the NALCN channelosome causes a broad range of neurological and developmental diseases called NALCN channelopathies in humans. How the auxiliary subunits, especially the two large components UNC79 and UNC80, assemble with NALCN and regulate its function remains unclear. Here we report an overall architecture of the human NALCN channelosome. UNC79 and UNC80 each adopt an S-shape super-helical structure consisting of HEAT and armadillo repeats, forming a super-coiled heterodimeric assembly in the cytoplasmic side, which may provide a scaffold for the binding of other potential modulators of the channelosome. The UNC79-UNC80 assembly specifically associates with the NALCN-FAM155A subcomplex through the intracellular II-III linker of NALCN. Disruptions of the interaction interfaces between UNC79 and UNC80, and between the II-III linker of NALCN and the UNC79-UNC80 assembly, significantly reduce the NALCN-mediated currents in HEK293T system, suggesting the importance of the UNC79-UNC80 assembly in regulating channelosome function. Cross-linking mass spectrometry analysis identified an additional calmodulin (CaM) bound in the carboxyl-terminal domain of NALCN. Our study thus provides a structural basis for understanding the unique assembly mechanism and functional regulation of the NALCN channelosome, and also provides an opportunity for the interpretation of many disease-related mutations in UNC80.


    Organizational Affiliation

    Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang, China. yanzhen@westlake.edu.cn.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein unc-80 homologA3,258Homo sapiensMutation(s): 0 
Gene Names: UNC80C2orf21KIAA1843
Membrane Entity: Yes 
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PHAROS:  Q8N2C7
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UniProt GroupQ8N2C7
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein unc-79 homologB2,658Homo sapiensMutation(s): 0 
Gene Names: UNC79KIAA1409
Membrane Entity: Yes 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin-1C [auth E]149Homo sapiensMutation(s): 0 
Gene Names: CALM1CALMCAMCAM1
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Sodium leak channel non-selective protein,Extended tegument protein pp150D [auth C]1,992Homo sapiensMutation(s): 0 
Gene Names: NALCNVGCNL1UL32
Membrane Entity: Yes 
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UniProt GroupsQ8IZF0A0A076JQ90
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Transmembrane protein FAM155AE [auth D]458Homo sapiensMutation(s): 0 
Gene Names: FAM155ANALF1NLF-1
Membrane Entity: Yes 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.50 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: 2022-04-20
    Type: Initial release