6PBX

Single particle cryo-EM structure of the voltage-gated K+ channel Eag1 3-13 deletion mutant bound to calmodulin (conformation 2)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Regulation of Eag1 gating by its intracellular domains.

Whicher, J.R.MacKinnon, R.

(2019) Elife 8: --

  • DOI: 10.7554/eLife.49188
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Voltage-gated potassium channels (K <sub>v </sub>s) are gated by transmembrane voltage sensors (VS) that move in response to changes in membrane voltage. K <sub>v </sub>10.1 or Eag1 also has three intracellular domains: PAS, C-linker, and CNBHD. We d ...

    Voltage-gated potassium channels (K v s) are gated by transmembrane voltage sensors (VS) that move in response to changes in membrane voltage. K v 10.1 or Eag1 also has three intracellular domains: PAS, C-linker, and CNBHD. We demonstrate that the Eag1 intracellular domains are not required for voltage-dependent gating but likely interact with the VS to modulate gating. We identified specific interactions between the PAS, CNBHD, and VS that modulate voltage-dependent gating and provide evidence that VS movement destabilizes these interactions to promote channel opening. Additionally, mutation of these interactions renders Eag1 insensitive to calmodulin inhibition. The structure of the calmodulin insensitive mutant in a pre-open conformation suggests that channel opening may occur through a rotation of the intracellular domains and calmodulin may prevent this rotation by stabilizing interactions between the VS and intracellular domains. Intracellular domains likely play a similar modulatory role in voltage-dependent gating of the related K v 11-12 channels.


    Organizational Affiliation

    Laboratory of Molecular Neurobiology and Biophysics, The Rockefeller University, Howard Hughes Medical Institute, New York, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium voltage-gated channel subfamily H member 1
A, C, E, G
846Rattus norvegicusMutation(s): 0 
Gene Names: Kcnh1 (Eag)
Find proteins for Q63472 (Rattus norvegicus)
Go to UniProtKB:  Q63472
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Calmodulin-1
B, D, F, H
149Homo sapiensMutation(s): 0 
Gene Names: CALM1 (CALM, CAM, CAM1)
Find proteins for P0DP23 (Homo sapiens)
Go to Gene View: CALM1
Go to UniProtKB:  P0DP23
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM43949
Howard Hughes Medical InstituteUnited States--
Damon Runyon Cancer Research FoundationUnited StatesDRG-2212-15

Revision History 

  • Version 1.0: 2019-09-18
    Type: Initial release
  • Version 1.1: 2019-09-25
    Type: Author supporting evidence, Data collection