4DEY

Crystal structure of the Voltage Dependent Calcium Channel beta-2 Subunit in Complex With The CaV1.2 I-II Linker.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The role of a voltage-dependent Ca2+ channel intracellular linker: a structure-function analysis.

Almagor, L.Chomsky-Hecht, O.Ben-Mocha, A.Hendin-Barak, D.Dascal, N.Hirsch, J.A.

(2012) J Neurosci 32: 7602-7613

  • DOI: 10.1523/JNEUROSCI.5727-11.2012
  • Primary Citation of Related Structures:  
    4DEX, 4DEY

  • PubMed Abstract: 
  • Voltage-dependent calcium channels (VDCCs) allow the passage of Ca(2+) ions through cellular membranes in response to membrane depolarization. The channel pore-forming subunit, α1, and a regulatory subunit (Ca(V)β) form a high affinity complex where Ca(V)β binds to a α1 interacting domain in the intracellular linker between α1 membrane domains I and II (I-II linker) ...

    Voltage-dependent calcium channels (VDCCs) allow the passage of Ca(2+) ions through cellular membranes in response to membrane depolarization. The channel pore-forming subunit, α1, and a regulatory subunit (Ca(V)β) form a high affinity complex where Ca(V)β binds to a α1 interacting domain in the intracellular linker between α1 membrane domains I and II (I-II linker). We determined crystal structures of Ca(V)β2 functional core in complex with the Ca(V)1.2 and Ca(V)2.2 I-II linkers to a resolution of 1.95 and 2.0 Å, respectively. Structural differences between the highly conserved linkers, important for coupling Ca(V)β to the channel pore, guided mechanistic functional studies. Electrophysiological measurements point to the importance of differing linker structure in both Ca(V)1 and 2 subtypes with mutations affecting both voltage- and calcium-dependent inactivation and voltage dependence of activation. These linker effects persist in the absence of Ca(V)β, pointing to the intrinsic role of the linker in VDCC function and suggesting that I-II linker structure can serve as a brake during inactivation.


    Organizational Affiliation

    Departments of Biochemistry and Molecular Biology, Institute of Structural Biology, George S. Wise Faculty of Life Sciences, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Voltage-dependent L-type calcium channel subunit alpha-1CA [auth B]106Oryctolagus cuniculusMutation(s): 0 
Gene Names: CACNA1CCACH2CACN2CACNL1A1CCHL1A1
UniProt
Find proteins for P15381 (Oryctolagus cuniculus)
Explore P15381 
Go to UniProtKB:  P15381
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Voltage-dependent L-type calcium channel subunit beta-2B [auth A]337Oryctolagus cuniculusMutation(s): 0 
Gene Names: CACNB2CACNLB2
UniProt
Find proteins for P54288 (Oryctolagus cuniculus)
Explore P54288 
Go to UniProtKB:  P54288
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BR
Query on BR

Download Ideal Coordinates CCD File 
C [auth B] , D [auth A] , E [auth A] , F [auth A] , G [auth A] , H [auth A] , I [auth A] , J [auth A] , 
C [auth B],  D [auth A],  E [auth A],  F [auth A],  G [auth A],  H [auth A],  I [auth A],  J [auth A],  K [auth A],  L [auth A],  M [auth A],  N [auth A],  O [auth A],  P [auth A],  Q [auth A],  R [auth A],  S [auth A]
BROMIDE ION
Br
CPELXLSAUQHCOX-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.257α = 90
b = 70.512β = 90
c = 134.339γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
SHARPphasing
REFMACrefinement
CNSrefinement
DNAdata collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-13
    Type: Initial release
  • Version 1.1: 2017-08-16
    Changes: Refinement description, Source and taxonomy
  • Version 1.2: 2019-07-17
    Changes: Data collection, Refinement description