7S5Y

Human KATP channel in open conformation, focused on Kir and one SUR, position 2


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 1.1 of the entry. See complete history


Literature

Molecular structure of an open human K ATP channel.

Zhao, C.MacKinnon, R.

(2021) Proc Natl Acad Sci U S A 118

  • DOI: https://doi.org/10.1073/pnas.2112267118
  • Primary Citation of Related Structures:  
    7S5T, 7S5V, 7S5X, 7S5Y, 7S5Z, 7S60, 7S61

  • PubMed Abstract: 

    K ATP channels are metabolic sensors that translate intracellular ATP/ADP balance into membrane excitability. The molecular composition of K ATP includes an inward-rectifier potassium channel (Kir) and an ABC transporter-like sulfonylurea receptor (SUR). Although structures of K ATP have been determined in many conformations, in all cases, the pore in Kir is closed. Here, we describe human pancreatic K ATP (hK ATP ) structures with an open pore at 3.1- to 4.0-Å resolution using single-particle cryo-electron microscopy (cryo-EM). Pore opening is associated with coordinated structural changes within the ATP-binding site and the channel gate in Kir. Conformational changes in SUR are also observed, resulting in an area reduction of contact surfaces between SUR and Kir. We also observe that pancreatic hK ATP exhibits the unique (among inward-rectifier channels) property of PIP 2 -independent opening, which appears to be correlated with a docked cytoplasmic domain in the absence of PIP 2 .


  • Organizational Affiliation

    HHMI, The Rockefeller University, New York, NY 10065.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-sensitive inward rectifier potassium channel 11
A, B, C, D
390Homo sapiensMutation(s): 2 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q14654 (Homo sapiens)
Explore Q14654 
Go to UniProtKB:  Q14654
PHAROS:  Q14654
GTEx:  ENSG00000187486 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14654
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-binding cassette sub-family C member 81,582Homo sapiensMutation(s): 0 
Gene Names: ABCC8HRINSSURSUR1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q09428 (Homo sapiens)
Explore Q09428 
Go to UniProtKB:  Q09428
PHAROS:  Q09428
GTEx:  ENSG00000006071 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ09428
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2021-12-01
    Type: Initial release
  • Version 1.1: 2021-12-08
    Changes: Database references