8DSA

LRRC8A:C in MSP1E3D1 nanodisc


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.48 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 basis for assembly and lipid-mediated gating of LRRC8A:C volume-regulated anion channels.

Kern, D.M.Bleier, J.Mukherjee, S.Hill, J.M.Kossiakoff, A.A.Isacoff, E.Y.Brohawn, S.G.

(2023) Nat Struct Mol Biol 30: 841-852

  • DOI: https://doi.org/10.1038/s41594-023-00944-6
  • Primary Citation of Related Structures:  
    8DR8, 8DRA, 8DRE, 8DRK, 8DRN, 8DRO, 8DRQ, 8DS3, 8DS9, 8DSA, 8F74, 8F75, 8F77, 8F79, 8F7B, 8F7D, 8F7E, 8F7J

  • PubMed Abstract: 

    Leucine-rich repeat-containing protein 8 (LRRC8) family members form volume-regulated anion channels activated by hypoosmotic cell swelling. LRRC8 channels are ubiquitously expressed in vertebrate cells as heteromeric assemblies of LRRC8A (SWELL1) and LRRC8B-E subunits. Channels of different subunit composition have distinct properties that explain the functional diversity of LRRC8 currents across cell types. However, the basis for heteromeric LRRC8 channel assembly and function is unknown. Here we leverage a fiducial-tagging strategy to determine single-particle cryo-EM structures of heterohexameric LRRC8A:C channels in multiple conformations. Compared to homomers, LRRC8A:C channels show pronounced differences in architecture due to heterotypic LRR interactions that displace subunits away from the conduction axis and poise the channel for activation. Structures and functional studies further reveal that lipids embedded in the channel pore block ion conduction in the closed state. These results provide insight into determinants for heteromeric LRRC8 channel assembly, activity and gating by lipids.


  • Organizational Affiliation

    Department of Molecular & Cell Biology, University of California, Berkeley, CA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Volume-regulated anion channel subunit LRRC8A,Soluble cytochrome b562
A, B, C, D, E
911Mus musculusMutation(s): 0 
Gene Names: Lrrc8aLrrc8cybC
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P0ABE7 (Escherichia coli)
Explore P0ABE7 
Go to UniProtKB:  P0ABE7
Find proteins for Q80WG5 (Mus musculus)
Explore Q80WG5 
Go to UniProtKB:  Q80WG5
IMPC:  MGI:2652847
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP0ABE7Q80WG5
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Volume-regulated anion channel subunit LRRC8C813Mus 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
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.48 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesF32GM128263

Revision History  (Full details and data files)

  • Version 1.0: 2023-03-08
    Type: Initial release
  • Version 1.1: 2023-03-29
    Changes: Database references
  • Version 1.2: 2023-07-05
    Changes: Database references