6V3G

Cryo-EM structure of Ca2+-free hsSlo1 channel


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 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: https://doi.org/10.7554/eLife.51409
  • Primary Citation of Related Structures:  
    6V22, 6V35, 6V38, 6V3G

  • 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 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)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calcium-activated potassium channel subunit alpha-1A [auth B],
B [auth A],
C,
D
1,065Homo sapiensMutation(s): 0 
Gene Names: KCNMA1KCNMASLO
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q12791 (Homo sapiens)
Explore Q12791 
Go to UniProtKB:  Q12791
PHAROS:  Q12791
GTEx:  ENSG00000156113 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ12791
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONFREALIGN9.11
MODEL REFINEMENTPHENIX1.16
MODEL REFINEMENTPHENIX1.16

Structure Validation

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Entry History & Funding Information

Deposition Data


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

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-25
    Type: Initial release
  • Version 1.1: 2020-10-07
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references, Refinement description