6CJT

Structure of the SthK cyclic nucleotide-gated potassium channel in complex with cGMP


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.46 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

Ligand discrimination and gating in cyclic nucleotide-gated ion channels from apo and partial agonist-bound cryo-EM structures.

Rheinberger, J.Gao, X.Schmidpeter, P.A.Nimigean, C.M.

(2018) Elife 7

  • DOI: https://doi.org/10.7554/eLife.39775
  • Primary Citation of Related Structures:  
    6CJQ, 6CJT, 6CJU

  • PubMed Abstract: 

    Cyclic nucleotide-modulated channels have important roles in visual signal transduction and pacemaking. Binding of cyclic nucleotides (cAMP/cGMP) elicits diverse functional responses in different channels within the family despite their high sequence and structure homology. The molecular mechanisms responsible for ligand discrimination and gating are unknown due to lack of correspondence between structural information and functional states. Using single particle cryo-electron microscopy and single-channel recording, we assigned functional states to high-resolution structures of SthK, a prokaryotic cyclic nucleotide-gated channel. The structures for apo, cAMP-bound, and cGMP-bound SthK in lipid nanodiscs, correspond to no, moderate, and low single-channel activity, respectively, consistent with the observation that all structures are in resting, closed states. The similarity between apo and ligand-bound structures indicates that ligand-binding domains are strongly coupled to pore and SthK gates in an allosteric, concerted fashion. The different orientations of cAMP and cGMP in the 'resting' and 'activated' structures suggest a mechanism for ligand discrimination.


  • Organizational Affiliation

    Departments of Anesthesiology, Weill Cornell Medical College, New York, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SthK cyclic nucleotide-gated potassium channel
A, B, C, D
456Spirochaeta thermophila DSM 6578Mutation(s): 0 
Gene Names: Spith_0644
Membrane Entity: Yes 
UniProt
Find proteins for G0GA88 (Spirochaeta thermophila (strain ATCC 700085 / DSM 6578 / Z-1203))
Explore G0GA88 
Go to UniProtKB:  G0GA88
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG0GA88
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PGW
Query on PGW

Download Ideal Coordinates CCD File 
BA [auth D]
CA [auth D]
DA [auth D]
EA [auth D]
F [auth A]
BA [auth D],
CA [auth D],
DA [auth D],
EA [auth D],
F [auth A],
FA [auth D],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
T [auth C],
U [auth C],
V [auth C],
W [auth C],
X [auth C],
Y [auth C],
Z [auth D]
(1R)-2-{[(S)-{[(2S)-2,3-dihydroxypropyl]oxy}(hydroxy)phosphoryl]oxy}-1-[(hexadecanoyloxy)methyl]ethyl (9Z)-octadec-9-enoate
C40 H77 O10 P
PAZGBAOHGQRCBP-HGWHEPCSSA-N
PCG
Query on PCG

Download Ideal Coordinates CCD File 
AA [auth D],
E [auth A],
L [auth B],
S [auth C]
CYCLIC GUANOSINE MONOPHOSPHATE
C10 H12 N5 O7 P
ZOOGRGPOEVQQDX-UUOKFMHZSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.46 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 StatesR01GM124451-01

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-01
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Author supporting evidence, Other
  • Version 1.2: 2024-03-13
    Changes: Data collection, Database references