6VAM

Cryo-EM structure of octameric chicken CALHM1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.63 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 and assembly of calcium homeostasis modulator proteins.

Syrjanen, J.L.Michalski, K.Chou, T.H.Grant, T.Rao, S.Simorowski, N.Tucker, S.J.Grigorieff, N.Furukawa, H.

(2020) Nat Struct Mol Biol 27: 150-159

  • DOI: https://doi.org/10.1038/s41594-019-0369-9
  • Primary Citation of Related Structures:  
    6VAI, 6VAK, 6VAL, 6VAM

  • PubMed Abstract: 

    The biological membranes of many cell types contain large-pore channels through which a wide variety of ions and metabolites permeate. Examples include connexin, innexin and pannexin, which form gap junctions and/or bona fide cell surface channels. The most recently identified large-pore channels are the calcium homeostasis modulators (CALHMs), through which ions and ATP permeate in a voltage-dependent manner to control neuronal excitability, taste signaling and pathologies of depression and Alzheimer's disease. Despite such critical biological roles, the structures and patterns of their oligomeric assembly remain unclear. Here, we reveal the structures of two CALHMs, chicken CALHM1 and human CALHM2, by single-particle cryo-electron microscopy (cryo-EM), which show novel assembly of the four transmembrane helices into channels of octamers and undecamers, respectively. Furthermore, molecular dynamics simulations suggest that lipids can favorably assemble into a bilayer within the larger CALHM2 pore, but not within CALHM1, demonstrating the potential correlation between pore size, lipid accommodation and channel activity.


  • Organizational Affiliation

    WM Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Green fluorescent protein,CALHM1 chimera
A, B, C, D, E
A, B, C, D, E, F, G, H
638Aequorea victoriaGallus gallus
This entity is chimeric
Mutation(s): 0 
Gene Names: GFPCALHM1
UniProt
Find proteins for P42212 (Aequorea victoria)
Explore P42212 
Go to UniProtKB:  P42212
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42212
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.63 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcisTEM

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)--

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-29
    Type: Initial release
  • Version 1.1: 2020-02-12
    Changes: Database references
  • Version 1.2: 2020-02-26
    Changes: Database references
  • Version 1.3: 2020-11-11
    Changes: Database references, Source and taxonomy, Structure summary