6V35

Cryo-EM structure of Ca2+-free hsSlo1-beta4 channel complex

  • 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: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


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
  • Primary Citation of Related Structures:  
    6V22, 6V3G, 6V35, 6V38

  • 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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium-activated potassium channel subunit alpha-1ABCD1065Homo sapiensMutation(s): 0 
Gene Names: KCNMA1KCNMASLO
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Human BK (SLO1) K+ channel in complex with β4, Ca2+ bound
Find proteins for Q12791 (Homo sapiens)
Explore Q12791 
Go to UniProtKB:  Q12791
NIH Common Fund Data Resources
PHAROS  Q12791
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium-activated potassium channel subunit beta-4EFGH219Homo sapiensMutation(s): 0 
Gene Names: KCNMB4
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Human BK (SLO1) K+ channel in complex with β4, Ca2+ bound
Find proteins for Q86W47 (Homo sapiens)
Explore Q86W47 
Go to UniProtKB:  Q86W47
NIH Common Fund Data Resources
PHAROS  Q86W47
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PGW
Query on PGW

Download CCD File 
A, B, C, D, E, F, G, H
(1R)-2-{[(S)-{[(2S)-2,3-dihydroxypropyl]oxy}(hydroxy)phosphoryl]oxy}-1-[(hexadecanoyloxy)methyl]ethyl (9Z)-octadec-9-enoate
C40 H77 O10 P
PAZGBAOHGQRCBP-HGWHEPCSSA-N
 Ligand Interaction
CLR
Query on CLR

Download CCD File 
A, B, C, D, E, F, G, H
CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
 Ligand Interaction
NAG
Query on NAG

Download CCD File 
E, F, G, H
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 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
  • Version 1.1: 2020-03-25
    Changes: Data collection, Data processing, Structure summary
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.3: 2020-10-07
    Changes: Database references, Structure summary