5U70

Chicken Slo2.2 in an open conformation vitrified in the presence of 300 mM NaCl


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.76 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

Structural Titration of Slo2.2, a Na(+)-Dependent K(+) Channel.

Hite, R.K.MacKinnon, R.

(2017) Cell 168: 390-399.e11

  • DOI: 10.1016/j.cell.2016.12.030
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The stable structural conformations that occur along the complete reaction coordinate for ion channel opening have never been observed. In this study, we describe the equilibrium ensemble of structures of Slo2.2, a neuronal Na+-activated K+ channel, ...

    The stable structural conformations that occur along the complete reaction coordinate for ion channel opening have never been observed. In this study, we describe the equilibrium ensemble of structures of Slo2.2, a neuronal Na+-activated K+ channel, as a function of the Na+ concentration. We find that Slo2.2 exists in multiple closed conformations whose relative occupancies are independent of Na+ concentration. An open conformation emerges from anĀ ensemble of closed conformations in a highly Na+-dependent manner, without evidence of Na+-dependent intermediates. In other words, channel opening is a highly concerted, switch-like process. The midpoint of the structural titration matches that of the functional titration. A maximum open conformation probability approaching 1.0 and maximum functional open probability approaching 0.7 imply that, within the class of open channels, there is a subclass that is not permeable to ions.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium channel subfamily T member 1
A
1201Gallus 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
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.76 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM43949
Howard Hughes Medical InstituteUnited States--

Revision History 

  • Version 1.0: 2017-02-08
    Type: Initial release
  • Version 1.1: 2017-07-26
    Type: Author supporting evidence, Data collection
  • Version 1.2: 2018-07-18
    Type: Data collection, Experimental preparation