1T0J

Crystal structure of a complex between voltage-gated calcium channel beta2a subunit and a peptide of the alpha1c subunit


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of a complex between a voltage-gated calcium channel beta-subunit and an alpha-subunit domain.

Van Petegem, F.Clark, K.A.Chatelain, F.C.Minor, D.L.

(2004) Nature 429: 671-675

  • DOI: https://doi.org/10.1038/nature02588
  • Primary Citation of Related Structures:  
    1T0H, 1T0J

  • PubMed Abstract: 

    Voltage-gated calcium channels (Ca(V)s) govern muscle contraction, hormone and neurotransmitter release, neuronal migration, activation of calcium-dependent signalling cascades, and synaptic input integration. An essential Ca(V) intracellular protein, the beta-subunit (Ca(V)beta), binds a conserved domain (the alpha-interaction domain, AID) between transmembrane domains I and II of the pore-forming alpha(1) subunit and profoundly affects multiple channel properties such as voltage-dependent activation, inactivation rates, G-protein modulation, drug sensitivity and cell surface expression. Here, we report the high-resolution crystal structures of the Ca(V)beta2a conserved core, alone and in complex with the AID. Previous work suggested that a conserved region, the beta-interaction domain (BID), formed the AID-binding site; however, this region is largely buried in the Ca(V)beta core and is unavailable for protein-protein interactions. The structure of the AID-Ca(V)beta2a complex shows instead that Ca(V)beta2a engages the AID through an extensive, conserved hydrophobic cleft (named the alpha-binding pocket, ABP). The ABP-AID interaction positions one end of the Ca(V)beta near the intracellular end of a pore-lining segment, called IS6, that has a critical role in Ca(V) inactivation. Together, these data suggest that Ca(V)betas influence Ca(V) gating by direct modulation of IS6 movement within the channel pore.


  • Organizational Affiliation

    Cardiovascular Research Institute, Department of Biochemistry and Biophysics, University of California San Francisco, 513 Parnassus Avenue, Box 0130, San Francisco, California 94143, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
voltage-gated calcium channel subunit beta2a132Rattus norvegicusMutation(s): 0 
Gene Names: CACNB2A
UniProt
Find proteins for Q8VGC3 (Rattus norvegicus)
Explore Q8VGC3 
Go to UniProtKB:  Q8VGC3
Entity Groups  
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UniProt GroupQ8VGC3
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
voltage-gated calcium channel subunit beta2a224Rattus norvegicusMutation(s): 0 
Gene Names: CACNB2A
UniProt
Find proteins for Q8VGC3 (Rattus norvegicus)
Explore Q8VGC3 
Go to UniProtKB:  Q8VGC3
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UniProt GroupQ8VGC3
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Voltage-dependent L-type calcium channel alpha-1C subunit20Homo sapiensMutation(s): 0 
Gene Names: CACNA1CCACNL1A1CCHL1A1CACH2CACN2
UniProt & NIH Common Fund Data Resources
Find proteins for Q13936 (Homo sapiens)
Explore Q13936 
Go to UniProtKB:  Q13936
GTEx:  ENSG00000151067 
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UniProt GroupQ13936
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download Ideal Coordinates CCD File 
D [auth B]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.756α = 96.81
b = 45.33β = 102.46
c = 60.652γ = 98.53
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-06-15
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description