3G43

Crystal structure of the calmodulin-bound Cav1.2 C-terminal regulatory domain dimer

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of dimeric cardiac L-type calcium channel regulatory domains bridged by Ca2+{middle dot}calmodulins.

Fallon, J.L., Baker, M.R., Xiong, L., Loy, R.E., Yang, G., Dirksen, R.T., Hamilton, S.L., Quiocho, F.A.

(2009) Proc Natl Acad Sci U S A 106: 5135-5140

  • DOI: 10.1073/pnas.0807487106
  • Primary Citation of Related Structures:  
    3G43

  • PubMed Abstract: 

    • Voltage-dependent calcium channels (Ca(V)) open in response to changes in membrane potential, but their activity is modulated by Ca(2+) binding to calmodulin (CaM). Structural studies of this family of channels have focused on CaM bound to the IQ motif; ...

    Voltage-dependent calcium channels (Ca(V)) open in response to changes in membrane potential, but their activity is modulated by Ca(2+) binding to calmodulin (CaM). Structural studies of this family of channels have focused on CaM bound to the IQ motif; however, the minimal differences between structures cannot adequately describe CaM's role in the regulation of these channels. We report a unique crystal structure of a 77-residue fragment of the Ca(V)1.2 alpha(1) subunit carboxyl terminus, which includes a tandem of the pre-IQ and IQ domains, in complex with Ca(2+).CaM in 2 distinct binding modes. The structure of the Ca(V)1.2 fragment is an unusual dimer of 2 coiled-coiled pre-IQ regions bridged by 2 Ca(2+).CaMs interacting with the pre-IQ regions and a canonical Ca(V)1-IQ-Ca(2+).CaM complex. Native Ca(V)1.2 channels are shown to be a mixture of monomers/dimers and a point mutation in the pre-IQ region predicted to abolish the coiled-coil structure significantly reduces Ca(2+)-dependent inactivation of heterologously expressed Ca(V)1.2 channels.

    Related Citations: 
    • Structure of calmodulin bound to the hydrophobic IQ domain of the cardiac Ca(v)1.2 calcium channel.
      Fallon, J.L., Halling, D.B., Hamilton, S.L., Quiocho, F.A.
      (2005) Structure 13: 1881
    Organizational Affiliation: 

    Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin A, B, C, D148Homo sapiensMutation(s): 0 
Gene Names: 
CALM, CALM1, CALM2, CALM3, CALML2, CAM, CAM1, CAM2, CAM3, CAMB...
CALM, CALM1, CALM2, CALM3, CALML2, CAM, CAM1, CAM2, CAM3, CAMB, CAMC, CAMIII

Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
NIH Common Fund Data Resources
PHAROS:  P0DP23
GTEx:  ENSG00000198668
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Voltage-dependent L-type calcium channel subunit alpha-1C E, F81Homo sapiensMutation(s): 0 
Gene Names: CACNA1C, CACH2, CACN2, CACNL1A1, CCHL1A1
Find proteins for Q13936 (Homo sapiens)
Explore Q13936 
Go to UniProtKB:  Q13936
NIH Common Fund Data Resources
PHAROS:  Q13936
GTEx:  ENSG00000151067
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.79α = 90
b = 113.98β = 90
c = 182.13γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing
CNSrefinement
PDB_EXTRACTdata extraction
HKL-3000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description