5A6E

Cryo-EM structure of the Slo2.2 Na-activated K channel


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Cryo-Electron Microscopy Structure of the Slo2.2 Na1-Activated K1 Channel

Hite, R.K.Yuan, P.Li, Z.Hsuing, Y.Walz, T.Mackinnon, R.

(2015) Nature 527: 198

  • DOI: 10.1038/nature14958
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Na(+)-activated K(+) channels are members of the Slo family of large conductance K(+) channels that are widely expressed in the brain, where their opening regulates neuronal excitability. These channels fulfil a number of biological roles and have in ...

    Na(+)-activated K(+) channels are members of the Slo family of large conductance K(+) channels that are widely expressed in the brain, where their opening regulates neuronal excitability. These channels fulfil a number of biological roles and have intriguing biophysical properties, including conductance levels that are ten times those of most other K(+) channels and gating sensitivity to intracellular Na(+). Here we present the structure of a complete Na(+)-activated K(+) channel, chicken Slo2.2, in the Na(+)-free state, determined by cryo-electron microscopy at a nominal resolution of 4.5 ångströms. The channel is composed of a large cytoplasmic gating ring, in which resides the Na(+)-binding site and a transmembrane domain that closely resembles voltage-gated K(+) channels. In the structure, the cytoplasmic domain adopts a closed conformation and the ion conduction pore is also closed. The structure reveals features that can explain the unusually high conductance of Slo channels and how contraction of the cytoplasmic gating ring closes the pore.


    Organizational Affiliation

    Rockefeller University and Howard Hughes Medical Institute, 1230 York Avenue, New York, New York 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
S1-S4 DOMAIN OF POTASSIUM CHANNEL SUBFAMILY T MEMBER 1
A
139N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PORE DOMAIN OF POTASSIUM CHANNEL SUBFAMILY T MEMBER 1
B
94Gallus gallusMutation(s): 0 
Gene Names: KCNT1 (SLACK)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Slo2.2 Na+-activated K+ channel, complete
Find proteins for Q8QFV0 (Gallus gallus)
Go to Gene View: KCNT1
Go to UniProtKB:  Q8QFV0
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
GATING RING OF POTASSIUM CHANNEL SUBFAMILY T MEMBER 1
C
700Gallus gallusMutation(s): 0 
Gene Names: KCNT1 (SLACK)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Slo2.2 Na+-activated K+ channel, complete
Find proteins for Q8QFV0 (Gallus gallus)
Go to Gene View: KCNT1
Go to UniProtKB:  Q8QFV0
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
RCK2 ELABORATION OF POTASSIUM CHANNEL SUBFAMILY T MEMBER 1
D
43N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
A, D
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2015-11-18
    Type: Database references
  • Version 1.2: 2017-08-30
    Type: Refinement description