5WUA

Structure of a Pancreatic ATP-sensitive Potassium Channel


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure of a Pancreatic ATP-Sensitive Potassium Channel

Li, N.Wu, J.X.Ding, D.Cheng, J.Gao, N.Chen, L.

(2017) Cell 168: 101-110.e10

  • DOI: 10.1016/j.cell.2016.12.028

  • PubMed Abstract: 
  • ATP-sensitive potassium channels (KATP) couple intracellular ATP levels with membrane excitability. These channels play crucial roles in many essential physiological processes and have been implicated extensively in a spectrum of metabolic diseases a ...

    ATP-sensitive potassium channels (KATP) couple intracellular ATP levels with membrane excitability. These channels play crucial roles in many essential physiological processes and have been implicated extensively in a spectrum of metabolic diseases and disorders. To gain insight into the mechanism of KATP, we elucidated the structure of a hetero-octameric pancreatic KATP channel in complex with a non-competitive inhibitor glibenclamide by single-particle cryoelectron microscopy to 5.6-Å resolution. The structure shows that four SUR1 regulatory subunits locate peripherally and dock onto the central Kir6.2 channel tetramer through the SUR1 TMD0-L0 fragment. Glibenclamide-bound SUR1 uses TMD0-L0 fragment to stabilize Kir6.2 channel in a closed conformation. In another structural population, a putative co-purified phosphatidylinositol 4,5-bisphosphate (PIP2) molecule uncouples Kir6.2 from glibenclamide-bound SUR1. These structural observations suggest a molecular mechanism for KATP regulation by anti-diabetic sulfonylurea drugs, intracellular adenosine nucleotide concentrations, and PIP2 lipid.


    Organizational Affiliation

    State Key Laboratory of Membrane Biology, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, Beijing 100871, China; School of Life Sciences, Peking University, Beijing 100871, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATP-sensitive inward rectifier potassium channel 11,superfolder GFP
A, B, C, D
681Mus musculusMutation(s): 0 
Gene Names: Kcnj11
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
SUR1/Kir6.2 pancreatic ATP-sensitive K+ channel
Find proteins for Q61743 (Mus musculus)
Go to UniProtKB:  Q61743
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SUR1
E, F, G, H
1582N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology of ChinaChina2016YFA0502004,2016YFA0500700,2013CB910404
National Natural Science Foundation of ChinaChina31622021, 31521062,31422016, 31470722, 31630087

Revision History 

  • Version 1.0: 2017-01-25
    Type: Initial release