8GMQ

Chicken CALHM1 purified from mammalian cells

  • Classification: MEMBRANE PROTEIN
  • Organism(s): Gallus gallus
  • Expression System: Homo sapiens
  • Mutation(s): No 
  • Membrane Protein: Yes  PDBTMMemProtMD

  • Deposited: 2023-03-27 Released: 2023-07-26 
  • Deposition Author(s): Syrjanen, J.L., Furukawa, H.
  • Funding Organization(s): National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS), National Institutes of Health/National Institute of Mental Health (NIH/NIMH)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.36 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of human CALHM1 reveals key locations for channel regulation and blockade by ruthenium red.

Syrjanen, J.L.Epstein, M.Gomez, R.Furukawa, H.

(2023) Nat Commun 14: 3821-3821

  • DOI: https://doi.org/10.1038/s41467-023-39388-3
  • Primary Citation of Related Structures:  
    8GMP, 8GMQ, 8GMR, 8S8Z, 8S90

  • PubMed Abstract: 

    Calcium homeostasis modulator 1 (CALHM1) is a voltage-dependent channel involved in neuromodulation and gustatory signaling. Despite recent progress in the structural biology of CALHM1, insights into functional regulation, pore architecture, and channel blockade remain limited. Here we present the cryo-EM structure of human CALHM1, revealing an octameric assembly pattern similar to the non-mammalian CALHM1s and the lipid-binding pocket conserved across species. We demonstrate by MD simulations that this pocket preferentially binds a phospholipid over cholesterol to stabilize its structure and regulate the channel activities. Finally, we show that residues in the amino-terminal helix form the channel pore that ruthenium red binds and blocks.


  • Organizational Affiliation

    W.M. Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, NY, 11724, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calcium homeostasis modulator 1
A, B, C, D, E
A, B, C, D, E, F, G, H
302Gallus gallusMutation(s): 0 
Gene Names: CALHM1
Membrane Entity: Yes 
UniProt
Find proteins for A0A8V0ZGE7 (Gallus gallus)
Explore A0A8V0ZGE7 
Go to UniProtKB:  A0A8V0ZGE7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A8V0ZGE7
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.36 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION
MODEL REFINEMENTCoot
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United States--
National Institutes of Health/National Institute of Mental Health (NIH/NIMH)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2023-07-26
    Type: Initial release
  • Version 1.1: 2024-05-01
    Changes: Data collection, Database references