7RU0

SthK R120A Open State 1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.30 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

Gating intermediates reveal inhibitory role of the voltage sensor in a cyclic nucleotide-modulated ion channel.

Gao, X.Schmidpeter, P.A.M.Berka, V.Durham, R.J.Fan, C.Jayaraman, V.Nimigean, C.M.

(2022) Nat Commun 13: 6919-6919

  • DOI: https://doi.org/10.1038/s41467-022-34673-z
  • Primary Citation of Related Structures:  
    7RSH, 7RTF, 7RTJ, 7RU0, 7RYR, 7RYS

  • PubMed Abstract: 

    Understanding how ion channels gate is important for elucidating their physiological roles and targeting them in pathophysiological states. Here, we used SthK, a cyclic nucleotide-modulated channel from Spirochaeta thermophila, to define a ligand-gating trajectory that includes multiple on-pathway intermediates. cAMP is a poor partial agonist for SthK and depolarization increases SthK activity. Tuning the energy landscape by gain-of-function mutations in the voltage sensor domain (VSD) allowed us to capture multiple intermediates along the ligand-activation pathway, highlighting the allosteric linkage between VSD, cyclic nucleotide-binding (CNBD) and pore domains. Small, lateral displacements of the VSD S4 segment were necessary to open the intracellular gate, pointing to an inhibitory VSD at rest. We propose that in wild-type SthK, depolarization leads to such VSD displacements resulting in release of inhibition. In summary, we report conformational transitions along the activation pathway that reveal allosteric couplings between key sites integrating to open the intracellular gate.


  • Organizational Affiliation

    Department of Anesthesiology, Weill Cornell Medical College, 1300 York Avenue, New York, NY, 10065, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SthK
A, B, C, D
456Spirochaeta thermophilaMutation(s): 0 
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
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1_Beta
MODEL REFINEMENTPHENIX

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--

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-23
    Type: Initial release
  • Version 1.1: 2022-11-30
    Changes: Database references
  • Version 1.2: 2024-06-05
    Changes: Data collection