7LFT

Cryo-EM structure of human Apo CNGA1 channel in K+/Ca2+


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 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

Structural mechanisms of gating and selectivity of human rod CNGA1 channel.

Xue, J.Han, Y.Zeng, W.Wang, Y.Jiang, Y.

(2021) Neuron 109: 1302-1313.e4

  • DOI: https://doi.org/10.1016/j.neuron.2021.02.007
  • Primary Citation of Related Structures:  
    7LFT, 7LFW, 7LFX, 7LFY, 7LG1

  • PubMed Abstract: 

    Mammalian cyclic nucleotide-gated (CNG) channels play an essential role in the signal transduction of the visual and olfactory sensory systems. Here we reveal the structural mechanism of ligand gating in human rod CNGA1 channel by determining its cryo-EM structures in both the apo closed and cGMP-bound open states. Distinct from most other members of voltage-gated tetrameric cation channels, CNGA1 forms a central channel gate in the middle of the membrane, occluding the central cavity. Structural analyses of ion binding profiles in the selectivity filters of the wild-type channel and the E365Q filter mutant allow us to unambiguously define the two Ca 2+ binding sites inside the selectivity filter, providing structural insights into Ca 2+ blockage and permeation in CNG channels. The structure of the E365Q mutant also reveals two alternative side-chain conformations at Q365, providing a plausible explanation for the voltage-dependent gating of CNG channel acquired upon E365 mutation.


  • Organizational Affiliation

    Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA; Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA.


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, D
560Homo sapiensMutation(s): 0 
Gene Names: CNGA1CNCGCNCG1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P29973 (Homo sapiens)
Explore P29973 
Go to UniProtKB:  P29973
PHAROS:  P29973
GTEx:  ENSG00000198515 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29973
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CPL
Query on CPL

Download Ideal Coordinates CCD File 
AA [auth C]
BA [auth C]
CA [auth C]
DA [auth C]
EA [auth C]
AA [auth C],
BA [auth C],
CA [auth C],
DA [auth C],
EA [auth C],
G [auth A],
H [auth A],
HA [auth D],
I [auth A],
IA [auth D],
J [auth A],
JA [auth D],
K [auth A],
KA [auth D],
L [auth A],
LA [auth D],
MA [auth D],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
Z [auth C]
1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C42 H80 N O8 P
JLPULHDHAOZNQI-ZTIMHPMXSA-N
CLR
Query on CLR

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
FA [auth D]
GA [auth D]
P [auth B]
E [auth A],
F [auth A],
FA [auth D],
GA [auth D],
P [auth B],
Q [auth B],
X [auth C],
Y [auth C]
CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
K (Subject of Investigation/LOI)
Query on K

Download Ideal Coordinates CCD File 
M [auth A],
N [auth A],
O [auth A]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--
Welch FoundationUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-10
    Type: Initial release
  • Version 1.1: 2021-05-05
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references