Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 571.63 kDa 
• Atom Count: 34959 
• Residue Count: 4227 
• Unique protein chains: 1

5ZSU

Structure of the human homo-hexameric LRRC8A channel at 4.25 Angstroms

• DOI: 10.2210/pdb5ZSU/pdb
• EMDataResource: EMD-6952

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2018-04-29 Released: 2018-08-15 
• Deposition Author(s): Kasuya, G., Nakane, T., Yokoyama, T., Shirouzu, M., Ishitani, R., Nureki, O.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.25 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structures of the human volume-regulated anion channel LRRC8.

Kasuya, G., Nakane, T., Yokoyama, T., Jia, Y., Inoue, M., Watanabe, K., Nakamura, R., Nishizawa, T., Kusakizako, T., Tsutsumi, A., Yanagisawa, H., Dohmae, N., Hattori, M., Ichijo, H., Yan, Z., Kikkawa, M., Shirouzu, M., Ishitani, R., Nureki, O.

(2018) Nat Struct Mol Biol 25: 797-804

• PubMed: 30127360 
• DOI: 10.1038/s41594-018-0109-6
• Primary Citation of Related Structures:  
  5ZSU


• PubMed Abstract: 
  

Maintenance of cell volume against osmotic change is crucial for proper cell functions. Leucine-rich repeat-containing 8 proteins are anion-selective channels that extrude anions to decrease the cell volume on cellular swelling. Here, we present the structure of human leucine-rich repeat-containing 8A, determined by single-particle cryo-electron microscopy. The structure shows a hexameric assembly, and the transmembrane region features a topology similar to gap junction channels. The LRR region, with 15 leucine-rich repeats, forms a long, twisted arc. The channel pore is located along the central axis and constricted on the extracellular side, where highly conserved polar and charged residues at the tip of the extracellular helix contribute to permeability to anions and other osmolytes. Two structural populations were identified, corresponding to compact and relaxed conformations. Comparing the two conformations suggests that the LRR region is flexible and mobile, with rigid-body motions, which might be implicated in structural transitions on pore opening.

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Organizational Affiliation: 

Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Volume-regulated anion channel subunit LRRC8A	A, B, C, D, E, F	818	Homo sapiens	Mutation(s): 0  Gene Names: LRRC8A, KIAA1437, LRRC8, SWELL1, UNQ221/PRO247
Find proteins for Q8IWT6 (Homo sapiens) Explore Q8IWT6  Go to UniProtKB:  Q8IWT6
NIH Common Fund Data Resources
PHAROS:  Q8IWT6 GTEx:  ENSG00000136802

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.25 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2018-04-29 
• Released Date: 2018-08-15 
Deposition Author(s): Kasuya, G., Nakane, T., Yokoyama, T., Shirouzu, M., Ishitani, R., Nureki, O.

Revision History 

• Version 1.0: 2018-08-15
  Type: Initial release
  
• Version 1.1: 2018-08-22
  Changes: Data collection, Structure summary
• Version 1.2: 2018-09-05
  Changes: Data collection, Database references
• Version 1.3: 2018-09-26
  Changes: Data collection, Database references