9EZC | pdb_00009ezc

Structure of the extracellular subdomain of a homomeric LRRC8C truncation disease mutant


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.41 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

De novo variants in LRRC8C resulting in constitutive channel activation cause a human multisystem disorder.

Quinodoz, M.Rutz, S.Peter, V.Garavelli, L.Innes, A.M.Lehmann, E.F.Kellenberger, S.Peng, Z.Barone, A.Campos-Xavier, B.Unger, S.Rivolta, C.Dutzler, R.Superti-Furga, A.

(2025) EMBO J 44: 413-436

  • DOI: https://doi.org/10.1038/s44318-024-00322-y
  • Primary Citation of Related Structures:  
    8RTS, 9EZC, 9F16

  • PubMed Abstract: 

    Volume-regulated anion channels (VRACs) are multimeric proteins composed of different paralogs of the LRRC8 family. They are activated in response to hypotonic swelling, but little is known about their specific functions. We studied two human individuals with the same congenital syndrome affecting blood vessels, brain, eyes, and bones. The LRRC8C gene harbored de novo variants in both patients, located in a region of the gene encoding the boundary between the pore and a cytoplasmic domain, which is depleted of sequence variations in control subjects. When studied by cryo-EM, both LRRC8C mutant proteins assembled as their wild-type counterparts, but showed increased flexibility, suggesting a destabilization of subunit interactions. When co-expressed with the obligatory LRRC8A subunit, the mutants exhibited enhanced activation, resulting in channel activity even at isotonic conditions in which wild-type channels are closed. We conclude that structural perturbations of LRRC8C impair channel gating and constitute the mechanistic basis of the dominant gain-of-function effect of these pathogenic variants. The pleiotropic phenotype of this novel clinical entity associated with monoallelic LRRC8C variants indicates the fundamental roles of VRACs in different tissues and organs.


  • Organizational Affiliation
    • Institute of Molecular and Clinical Ophthalmology Basel (IOB), 4031, Basel, Switzerland.

Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Volume-regulated anion channel subunit LRRC8C
A, B, C, D, E
A, B, C, D, E, F, G
414Homo sapiensMutation(s): 6 
Gene Names: LRRC8CAD158FAD158
UniProt & NIH Common Fund Data Resources
Find proteins for Q8TDW0 (Homo sapiens)
Explore Q8TDW0 
Go to UniProtKB:  Q8TDW0
PHAROS:  Q8TDW0
GTEx:  ENSG00000171488 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8TDW0
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.41 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerlandNo. 310030_204373

Revision History  (Full details and data files)

  • Version 1.0: 2024-11-13
    Type: Initial release
  • Version 1.1: 2024-11-27
    Changes: Data collection
  • Version 1.2: 2025-06-04
    Changes: Data collection, Database references