8B40

Structure of homomeric LRRC8C Volume-Regulated Anion Channel


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of a volume-regulated heteromeric LRRC8A/C channel.

Rutz, S.Deneka, D.Dittmann, A.Sawicka, M.Dutzler, R.

(2023) Nat Struct Mol Biol 30: 52-61

  • DOI: https://doi.org/10.1038/s41594-022-00899-0
  • Primary Citation of Related Structures:  
    8B40, 8B41, 8B42, 8BEN

  • PubMed Abstract: 

    Volume-regulated anion channels (VRACs) participate in the cellular response to osmotic swelling. These membrane proteins consist of heteromeric assemblies of LRRC8 subunits, whose compositions determine permeation properties. Although structures of the obligatory LRRC8A, also referred to as SWELL1, have previously defined the architecture of VRACs, the organization of heteromeric channels has remained elusive. Here we have addressed this question by the structural characterization of murine LRRC8A/C channels. Like LRRC8A, these proteins assemble as hexamers. Despite 12 possible arrangements, we find a predominant organization with an A:C ratio of two. In this assembly, four LRRC8A subunits cluster in their preferred conformation observed in homomers, as pairs of closely interacting proteins that stabilize a closed state of the channel. In contrast, the two interacting LRRC8C subunits show a larger flexibility, underlining their role in the destabilization of the tightly packed A subunits, thereby enhancing the activation properties of the protein.


  • Organizational Affiliation

    Department of Biochemistry, University of Zurich, Zurich, 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
811Mus musculusMutation(s): 0 
Gene Names: Lrrc8cAd158Fad158
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8R502 (Mus musculus)
Explore Q8R502 
Go to UniProtKB:  Q8R502
IMPC:  MGI:2140839
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8R502
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland--

Revision History  (Full details and data files)

  • Version 1.0: 2022-12-14
    Type: Initial release
  • Version 1.1: 2022-12-28
    Changes: Database references
  • Version 1.2: 2023-02-01
    Changes: Database references
  • Version 1.3: 2024-10-16
    Changes: Data collection, Structure summary