6V38

Cryo-EM structure of Ca2+-bound hsSlo1 channel

  • Classification: TRANSPORT PROTEIN
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens
  • Mutation(s): No 

  • Deposited: 2019-11-25 Released: 2019-12-25 
  • Deposition Author(s): Tao, X., MacKinnon, R.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report



Literature

Molecular structures of the human Slo1 K+channel in complex with beta 4.

Tao, X.MacKinnon, R.

(2019) Elife 8

  • DOI: 10.7554/eLife.51409
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Slo1 is a Ca 2+ - and voltage-activated K + channel that underlies skeletal and smooth muscle contraction, audition, hormone secretion and neurotransmitter release. In mammals, Slo1 is regulated by auxiliary proteins that confe ...

    Slo1 is a Ca 2+ - and voltage-activated K + channel that underlies skeletal and smooth muscle contraction, audition, hormone secretion and neurotransmitter release. In mammals, Slo1 is regulated by auxiliary proteins that confer tissue-specific gating and pharmacological properties. This study presents cryo-EM structures of Slo1 in complex with the auxiliary protein, β4. Four β4, each containing two transmembrane helices, encircle Slo1, contacting it through helical interactions inside the membrane. On the extracellular side, β4 forms a tetrameric crown over the pore. Structures with high and low Ca 2+ concentrations show that identical gating conformations occur in the absence and presence of β4, implying that β4 serves to modulate the relative stabilities of 'pre-existing' conformations rather than creating new ones. The effects of β4 on scorpion toxin inhibition kinetics are explained by the crown, which constrains access but does not prevent binding.


    Organizational Affiliation

    Laboratory of Molecular Neurobiology and Biophysics, The Rockefeller University, Howard Hughes Medical Institute, New York, United States.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calcium-activated potassium channel subunit alpha-1
A, B, C, D
1065Homo sapiensMutation(s): 0 
Gene Names: KCNMA1KCNMASLO
Find proteins for Q12791 (Homo sapiens)
Go to UniProtKB:  Q12791
NIH Common Fund Data Resources
PHAROS  Q12791
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
POV
Query on POV

Download CCD File 
A, B, C, D
(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
C42 H82 N O8 P
WTJKGGKOPKCXLL-PFDVCBLKSA-N
 Ligand Interaction
CLR
Query on CLR

Download CCD File 
A, B, C, D
CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
 Ligand Interaction
CA
Query on CA

Download CCD File 
A, B, C, D
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A, B, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2019-11-25 
  • Released Date: 2019-12-25 
  • Deposition Author(s): Tao, X., MacKinnon, R.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM43949

Revision History 

  • Version 1.0: 2019-12-25
    Type: Initial release