1T0H

Crystal structure of the Rattus norvegicus voltage gated calcium channel beta subunit isoform 2a


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 

wwPDB Validation   3D Report Full Report


This is version 1.2 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
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
VOLTAGE-GATED CALCIUM CHANNEL SUBUNIT BETA2A132Rattus norvegicusMutation(s): 2 
Gene Names: CACNB2
UniProt
Find proteins for Q8VGC3 (Rattus norvegicus)
Explore Q8VGC3 
Go to UniProtKB:  Q8VGC3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8VGC3
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
VOLTAGE-GATED CALCIUM CHANNEL SUBUNIT BETA2A224Rattus norvegicusMutation(s): 5 
Gene Names: CACNB2
UniProt
Find proteins for Q8VGC3 (Rattus norvegicus)
Explore Q8VGC3 
Go to UniProtKB:  Q8VGC3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8VGC3
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download Ideal Coordinates CCD File 
C [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.176α = 107.34
b = 45.26β = 95.75
c = 58.701γ = 97
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



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: Version format compliance