7O4H

The structure of the native CNGA1/CNGB1 CNG channel from retinal rods


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 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

The structure of the native CNGA1/CNGB1 CNG channel from bovine retinal rods.

Barret, D.C.A.Schertler, G.F.X.Benjamin Kaupp, U.Marino, J.

(2022) Nat Struct Mol Biol 29: 32-39

  • DOI: https://doi.org/10.1038/s41594-021-00700-8
  • Primary Citation of Related Structures:  
    7O4H

  • PubMed Abstract: 

    In rod photoreceptors of the retina, the cyclic nucleotide-gated (CNG) channel is composed of three CNGA and one CNGB subunits, and it closes in response to light activation to generate an electrical signal that is conveyed to the brain. Here we report the cryo-EM structure of the closed state of the native rod CNG channel isolated from bovine retina. The structure reveals differences between CNGA1 and CNGB1 subunits. Three CNGA1 subunits are tethered at their C terminus by a coiled-coil region. The C-helix in the cyclic nucleotide-binding domain of CNGB1 features a different orientation from that in the three CNGA1 subunits. The arginine residue R994 of CNGB1 reaches into the ionic pathway and blocks the pore, thus introducing an additional gate, which is different from the central hydrophobic gate known from homomeric CNGA channels. These results address the long-standing question of how CNGB1 subunits contribute to the function of CNG channels in visual and olfactory neurons.


  • Organizational Affiliation

    Laboratory of Biomolecular Research, Paul Scherrer Institut, Villigen, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cGMP-gated cation channel alpha-1
A, B, C
690Bos taurusMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q00194 (Bos taurus)
Explore Q00194 
Go to UniProtKB:  Q00194
Entity Groups  
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UniProt GroupQ00194
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclic nucleotide-gated cation channel beta-11,394Bos taurusMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q28181 (Bos taurus)
Explore Q28181 
Go to UniProtKB:  Q28181
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ28181
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland19082

Revision History  (Full details and data files)

  • Version 1.0: 2022-01-12
    Type: Initial release
  • Version 1.1: 2022-02-02
    Changes: Database references
  • Version 1.2: 2024-07-10
    Changes: Data collection