Structural Basis for KCNE3 and Estrogen Modulation of the KCNQ1 Channel

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 9764 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Structural basis for KCNE3 modulation of potassium recycling in epithelia.

Kroncke, B.M.Van Horn, W.D.Smith, J.Kang, C.Welch, R.C.Song, Y.Nannemann, D.P.Taylor, K.C.Sisco, N.J.George, A.L.Meiler, J.Vanoye, C.G.Sanders, C.R.

(2016) Sci Adv 2: e1501228-e1501228

  • DOI: https://doi.org/10.1126/sciadv.1501228
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The single-span membrane protein KCNE3 modulates a variety of voltage-gated ion channels in diverse biological contexts. In epithelial cells, KCNE3 regulates the function of the KCNQ1 potassium ion (K(+)) channel to enable K(+) recycling coupled to transepithelial chloride ion (Cl(-)) secretion, a physiologically critical cellular transport process in various organs and whose malfunction causes diseases, such as cystic fibrosis (CF), cholera, and pulmonary edema. Structural, computational, biochemical, and electrophysiological studies lead to an atomically explicit integrative structural model of the KCNE3-KCNQ1 complex that explains how KCNE3 induces the constitutive activation of KCNQ1 channel activity, a crucial component in K(+) recycling. Central to this mechanism are direct interactions of KCNE3 residues at both ends of its transmembrane domain with residues on the intra- and extracellular ends of the KCNQ1 voltage-sensing domain S4 helix. These interactions appear to stabilize the activated "up" state configuration of S4, a prerequisite for full opening of the KCNQ1 channel gate. In addition, the integrative structural model was used to guide electrophysiological studies that illuminate the molecular basis for how estrogen exacerbates CF lung disease in female patients, a phenomenon known as the "CF gender gap."

  • Organizational Affiliation

    Department of Biochemistry, Vanderbilt University, Nashville, TN 37240, USA.; Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily E member 3112Homo sapiensMutation(s): 0 
Gene Names: KCNE3MiRP2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y6H6 (Homo sapiens)
Explore Q9Y6H6 
Go to UniProtKB:  Q9Y6H6
GTEx:  ENSG00000175538 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y6H6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 9764 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-21
    Type: Initial release
  • Version 1.1: 2017-12-20
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Data collection, Database references, Other
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references