6M04

Structure of the human homo-hexameric LRRC8D channel at 4.36 Angstroms


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.36 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report



Literature

Cryo-EM structure of the volume-regulated anion channel LRRC8D isoform identifies features important for substrate permeation.

Nakamura, R.Numata, T.Kasuya, G.Yokoyama, T.Nishizawa, T.Kusakizako, T.Kato, T.Hagino, T.Dohmae, N.Inoue, M.Watanabe, K.Ichijo, H.Kikkawa, M.Shirouzu, M.Jentsch, T.J.Ishitani, R.Okada, Y.Nureki, O.

(2020) Commun Biol 3: 240-240

  • DOI: 10.1038/s42003-020-0951-z
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Members of the leucine-rich repeat-containing 8 (LRRC8) protein family, composed of the five LRRC8A-E isoforms, are pore-forming components of the volume-regulated anion channel (VRAC). LRRC8A and at least one of the other LRRC8 isoforms assemble int ...

    Members of the leucine-rich repeat-containing 8 (LRRC8) protein family, composed of the five LRRC8A-E isoforms, are pore-forming components of the volume-regulated anion channel (VRAC). LRRC8A and at least one of the other LRRC8 isoforms assemble into heteromers to generate VRAC transport activities. Despite the availability of the LRRC8A structures, the structural basis of how LRRC8 isoforms other than LRRC8A contribute to the functional diversity of VRAC has remained elusive. Here, we present the structure of the human LRRC8D isoform, which enables the permeation of organic substrates through VRAC. The LRRC8D homo-hexamer structure displays a two-fold symmetric arrangement, and together with a structure-based electrophysiological analysis, revealed two key features. The pore constriction on the extracellular side is wider than that in the LRRC8A structures, which may explain the increased permeability of organic substrates. Furthermore, an N-terminal helix protrudes into the pore from the intracellular side and may be critical for gating.


    Organizational Affiliation

    Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan. nureki@bs.s.u-tokyo.ac.jp.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Volume-regulated anion channel subunit LRRC8D
A, B, C, D, E, F
866Homo sapiensMutation(s): 1 
Gene Names: LRRC8DLRRC5UNQ213/PRO239
Find proteins for Q7L1W4 (Homo sapiens)
Go to UniProtKB:  Q7L1W4
NIH Common Fund Data Resources
PHAROS  Q7L1W4
Protein Feature View
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.36 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Education, Culture, Sports, Science and Technology (Japan)Japan16H06294
Japan Society for the Promotion of Science (JSPS)Japan19K23833

Revision History 

  • Version 1.0: 2020-06-17
    Type: Initial release