6MIE

Solution NMR structure of the KCNQ1 voltage-sensing domain


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 150 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure and physiological function of the human KCNQ1 channel voltage sensor intermediate state.

Taylor, K.C.Kang, P.W.Hou, P.Yang, N.D.Kuenze, G.Smith, J.A.Shi, J.Huang, H.White, K.M.Peng, D.George, A.L.Meiler, J.McFeeters, R.L.Cui, J.Sanders, C.R.

(2020) Elife 9

  • DOI: 10.7554/eLife.53901
  • Primary Citation of Related Structures:  
    6MIE

  • PubMed Abstract: 
  • Voltage-gated ion channels feature voltage sensor domains (VSDs) that exist in three distinct conformations during activation: resting, intermediate, and activated. Experimental determination of the structure of a potassium channel VSD in the intermediate state has previously proven elusive ...

    Voltage-gated ion channels feature voltage sensor domains (VSDs) that exist in three distinct conformations during activation: resting, intermediate, and activated. Experimental determination of the structure of a potassium channel VSD in the intermediate state has previously proven elusive. Here, we report and validate the experimental three-dimensional structure of the human KCNQ1 voltage-gated potassium channel VSD in the intermediate state. We also used mutagenesis and electrophysiology in Xenopus laevis oocytes to functionally map the determinants of S4 helix motion during voltage-dependent transition from the intermediate to the activated state. Finally, the physiological relevance of the intermediate state KCNQ1 conductance is demonstrated using voltage-clamp fluorometry. This work illuminates the structure of the VSD intermediate state and demonstrates that intermediate state conductivity contributes to the unusual versatility of KCNQ1, which can function either as the slow delayed rectifier current (I Ks ) of the cardiac action potential or as a constitutively active epithelial leak current.


    Organizational Affiliation

    Department of Medicine, Vanderbilt University Medical Center, Nashville, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily KQT member 1 A159Homo sapiensMutation(s): 0 
Gene Names: KCNQ1KCNA8KCNA9KVLQT1
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
KCNQ1 cardiac slow-delayed rectifier K+ channel voltage sensor intermediate state
Find proteins for P51787 (Homo sapiens)
Explore P51787 
Go to UniProtKB:  P51787
NIH Common Fund Data Resources
PHAROS:  P51787
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 150 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 6MIE Olderado

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesRO1 HL122010

Revision History  (Full details and data files)

  • Version 1.0: 2020-03-04
    Type: Initial release
  • Version 1.1: 2020-03-11
    Changes: Database references