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 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.200 

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: 10.1038/nature02588
  • Primary Citation of Related Structures:  1T0H

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
voltage-gated calcium channel subunit beta2a
A
132Rattus norvegicusGene Names: Cacnb2 (Cacnlb2)
Find proteins for Q8VGC3 (Rattus norvegicus)
Go to UniProtKB:  Q8VGC3
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
voltage-gated calcium channel subunit beta2a
B
224Rattus norvegicusGene Names: Cacnb2 (Cacnlb2)
Find proteins for Q8VGC3 (Rattus norvegicus)
Go to UniProtKB:  Q8VGC3
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Voltage-dependent L-type calcium channel alpha-1C subunit
C
20Homo sapiensGene Names: CACNA1C (CACH2, CACN2, CACNL1A1, CCHL1A1)
Find proteins for Q13936 (Homo sapiens)
Go to Gene View: CACNA1C
Go to UniProtKB:  Q13936
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.200 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 36.756α = 96.81
b = 45.330β = 102.46
c = 60.652γ = 98.53
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-06-15
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance