5TJ6

Ca2+ bound aplysia Slo1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Cryo-EM structure of the open high-conductance Ca(2+)-activated K(+) channel.

Tao, X.Hite, R.K.MacKinnon, R.

(2017) Nature 541: 46-51

  • DOI: 10.1038/nature20608

  • PubMed Abstract: 
  • The Ca <sup>2+ </sup>-activated K <sup>+ </sup> channel, Slo1, has an unusually large conductance and contains a voltage sensor and multiple chemical sensors. Dual activation by membrane voltage and Ca <sup>2+ </sup> renders Slo1 central to processes ...

    The Ca 2+ -activated K + channel, Slo1, has an unusually large conductance and contains a voltage sensor and multiple chemical sensors. Dual activation by membrane voltage and Ca 2+ renders Slo1 central to processes that couple electrical signalling to Ca 2+ -mediated events such as muscle contraction and neuronal excitability. Here we present the cryo-electron microscopy structure of a full-length Slo1 channel from Aplysia californica in the presence of Ca 2+ and Mg 2+ at a resolution of 3.5 Å. The channel adopts an open conformation. Its voltage-sensor domain adopts a non-domain-swapped attachment to the pore and contacts the cytoplasmic Ca 2+ -binding domain from a neighbouring subunit. Unique structural features of the Slo1 voltage sensor suggest that it undergoes different conformational changes than other known voltage sensors. The structure reveals the molecular details of three distinct divalent cation-binding sites identified through electrophysiological studies of mutant Slo1 channels.


    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
High conductance calcium-activated potassium channel
A
1070Aplysia californicaMutation(s): 0 
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Slo1 (BK) calcium-activated K+ channel
Find proteins for Q5QJC5 (Aplysia californica)
Go to UniProtKB:  Q5QJC5
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
PGW
Query on PGW

Download SDF File 
Download CCD File 
A
(1R)-2-{[(S)-{[(2S)-2,3-dihydroxypropyl]oxy}(hydroxy)phosphoryl]oxy}-1-[(hexadecanoyloxy)methyl]ethyl (9Z)-octadec-9-enoate
1-Palmitoyl-2-Oleoyl-sn-Glycero-3-[Phospho-(1-glycerol)]; PHOSPHATIDYLGLYCEROL
C40 H77 O10 P
PAZGBAOHGQRCBP-HGWHEPCSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.5 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: 2016-12-14
    Type: Initial release
  • Version 1.1: 2017-01-11
    Type: Database references
  • Version 1.2: 2017-01-18
    Type: Database references
  • Version 1.3: 2017-09-27
    Type: Author supporting evidence, Data collection
  • Version 1.4: 2018-10-03
    Type: Data collection, Refinement description