Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Hetero 8-mer - A4B4 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: native gel electrophoresis

Macromolecule Content

• Total Structure Weight: 887921.94 
• Atom Count: 44852 
• Residue Count: 7888 
• Unique protein chains: 2

6BAA

Cryo-EM structure of the pancreatic beta-cell KATP channel bound to ATP and glibenclamide

• DOI: 10.2210/pdb6BAA/pdb
• EMDataResource: EMD-7073

• Classification: METAL TRANSPORT
• Organism(s): Rattus norvegicus, Cricetus cricetus
• Expression System: Rattus norvegicus


• Deposited: 2017-10-12 Released: 2017-11-01 
• Deposition Author(s): Martin, G.M., Yoshioka, C., Shyng, S.L.
• Funding Organization(s): National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease 

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.63 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Anti-diabetic drug binding site in a mammalian KATPchannel revealed by Cryo-EM.

Martin, G.M., Kandasamy, B., DiMaio, F., Yoshioka, C., Shyng, S.L.

(2017) Elife 6: --

• PubMed: 29035201 
• DOI: 10.7554/eLife.31054


• PubMed Abstract: 
  

Sulfonylureas are anti-diabetic medications that act by inhibiting pancreatic K _ATP channels composed of SUR1 and Kir6.2. The mechanism by which these drugs interact with and inhibit the channel has been extensively investigated, yet it remains unclear where the drug binding pocket resides. Here, we present a cryo-EM structure of a hamster SUR1/rat Kir6.2 channel bound to a high-affinity sulfonylurea drug glibenclamide and ATP at 3.63 Å resolution, which reveals unprecedented details of the ATP and glibenclamide binding sites. Importantly, the structure shows for the first time that glibenclamide is lodged in the transmembrane bundle of the SUR1-ABC core connected to the first nucleotide binding domain near the inner leaflet of the lipid bilayer. Mutation of residues predicted to interact with glibenclamide in our model led to reduced sensitivity to glibenclamide. Our structure provides novel mechanistic insights of how sulfonylureas and ATP interact with the K _ATP channel complex to inhibit channel activity.

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Organizational Affiliation: 

Department of Biochemistry, University of Washington, Seattle, United States.,Department of Biomedical Engineering, Oregon Health and Science University, Portland, United States.,Department of Biochemistry and Molecular Biology, Oregon Health and Science University, Portland, United States.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ATP-sensitive inward rectifier potassium channel 11	A, B, C, D	390	Rattus norvegicus	Mutation(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 P70673 (Rattus norvegicus) Go to UniProtKB:  P70673

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
ATP-binding cassette sub-family C member 8	E, F, G, H	1582	Cricetus cricetus	Mutation(s): 0  Gene Names: ABCC8 (SUR)
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 Q09427 (Cricetus cricetus) Go to Gene View: ABCC8 Go to UniProtKB:  Q09427

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ATP	A, B, C, D	ADENOSINE-5'-TRIPHOSPHATE C10 H16 N5 O13 P3 ZKHQWZAMYRWXGA-KQYNXXCUSA-N
GBM	E, F, G, H	5-chloro-N-(2-{4-[(cyclohexylcarbamoyl)sulfamoyl]phenyl}ethyl)-2-methoxybenzamide Glibenclamide, Glyburide C23 H28 Cl N3 O5 S ZNNLBTZKUZBEKO-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.63 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-10-12 
• Released Date: 2017-11-01 
• Deposition Author(s): Martin, G.M., Yoshioka, C., Shyng, S.L.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease	United States	--

Revision History 

• Version 1.0: 2017-11-01
  Type: Initial release
• Version 1.1: 2018-02-28
  Type: Database references
• Version 1.2: 2018-03-28
  Type: Data collection, Database references