6V01

structure of human KCNQ1-KCNE3-CaM complex with PIP2

  • Classification: MEMBRANE PROTEIN
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens
  • Mutation(s): No 

  • Deposited: 2019-11-18 Released: 2019-12-04 
  • Deposition Author(s): Mackinnon, R., Sun, J.
  • Funding Organization(s): National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI), Howard Hughes Medical Institute (HHMI)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural Basis of Human KCNQ1 Modulation and Gating.

Sun, J.MacKinnon, R.

(2020) Cell 180: 340-347.e9

  • DOI: 10.1016/j.cell.2019.12.003
  • Primary Citation of Related Structures:  
    6V01, 6V00, 6UZZ

  • PubMed Abstract: 
  • KCNQ1, also known as Kv7.1, is a voltage-dependent K + channel that regulates gastric acid secretion, salt and glucose homeostasis, and heart rhythm. Its functional properties are regulated in a tissue-specific manner through co-assembly with beta subunits KCNE1-5 ...

    KCNQ1, also known as Kv7.1, is a voltage-dependent K + channel that regulates gastric acid secretion, salt and glucose homeostasis, and heart rhythm. Its functional properties are regulated in a tissue-specific manner through co-assembly with beta subunits KCNE1-5. In non-excitable cells, KCNQ1 forms a complex with KCNE3, which suppresses channel closure at negative membrane voltages that otherwise would close it. Pore opening is regulated by the signaling lipid PIP2. Using cryoelectron microscopy (cryo-EM), we show that KCNE3 tucks its single-membrane-spanning helix against KCNQ1, at a location that appears to lock the voltage sensor in its depolarized conformation. Without PIP2, the pore remains closed. Upon addition, PIP2 occupies a site on KCNQ1 within the inner membrane leaflet, which triggers a large conformational change that leads to dilation of the pore's gate. It is likely that this mechanism of PIP2 activation is conserved among Kv7 channels.


    Organizational Affiliation

    Laboratory of Molecular Neurobiology and Biophysics and Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA. Electronic address: mackinn@rockefeller.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin-1 BEHK149Homo sapiensMutation(s): 0 
Gene Names: CALM1CALMCAMCAM1
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
NIH Common Fund Data Resources
PHAROS:  P0DP23
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily E member 3,Potassium voltage-gated channel subfamily E member 3 CFIL355Homo sapiensMutation(s): 0 
Gene Names: KCNE3
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
KCNQ1 cardiac slow-delayed rectifier K+ channel in complex with calmodulin (CaM)
Find proteins for X5DSL3 (Anaplasma marginale)
Explore X5DSL3 
Go to UniProtKB:  X5DSL3
Find proteins for Q9Y6H6 (Homo sapiens)
Explore Q9Y6H6 
Go to UniProtKB:  Q9Y6H6
NIH Common Fund Data Resources
PHAROS:  Q9Y6H6
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily KQT member 1 ADGJ557Homo 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 in complex with calmodulin (CaM)
Find proteins for P51787 (Homo sapiens)
Explore P51787 
Go to UniProtKB:  P51787
NIH Common Fund Data Resources
PHAROS:  P51787
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2019-11-18 
  • Released Date: 2019-12-04 
  • Deposition Author(s): Mackinnon, R., Sun, J.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United States5K99HL143037
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-04
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.2: 2020-01-15
    Changes: Database references
  • Version 1.3: 2020-02-05
    Changes: Database references