4OVN

Voltage-gated Sodium Channel 1.5 (Nav1.5) C-terminal domain in complex with Calmodulin poised for activation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.215 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Regulation of the NaV1.5 cytoplasmic domain by calmodulin.

Gabelli, S.B.Boto, A.Kuhns, V.H.Bianchet, M.A.Farinelli, F.Aripirala, S.Yoder, J.Jakoncic, J.Tomaselli, G.F.Amzel, L.M.

(2014) Nat Commun 5: 5126

  • DOI: 10.1038/ncomms6126
  • Primary Citation of Related Structures:  
    4OVN

  • PubMed Abstract: 
  • Voltage-gated sodium channels (Na(v)) underlie the rapid upstroke of action potentials in excitable tissues. Binding of channel-interactive proteins is essential for controlling fast and long-term inactivation. In the structure of the complex of the carboxy-terminal portion of Na(v)1 ...

    Voltage-gated sodium channels (Na(v)) underlie the rapid upstroke of action potentials in excitable tissues. Binding of channel-interactive proteins is essential for controlling fast and long-term inactivation. In the structure of the complex of the carboxy-terminal portion of Na(v)1.5 (CTNa(v)1.5) with calmodulin (CaM)-Mg(2+) reported here, both CaM lobes interact with the CTNa(v)1.5. On the basis of the differences between this structure and that of an inactivated complex, we propose that the structure reported here represents a non-inactivated state of the CTNa(v), that is, the state that is poised for activation. Electrophysiological characterization of mutants further supports the importance of the interactions identified in the structure. Isothermal titration calorimetry experiments show that CaM binds to CTNa(v)1.5 with high affinity. The results of this study provide unique insights into the physiological activation and the pathophysiology of Na(v) channels.


    Organizational Affiliation

    Structural Enzymology and Thermodynamics Group, Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, 725 N Wolfe Street, WBSB 608, Baltimore, Maryland 21205, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CalmodulinA, C [auth B], E [auth C], G [auth D], I [auth E]149Homo sapiensMutation(s): 0 
Gene Names: 
CALM1CALMCAMCAM1CALM2CAM2CAMBCALM3CALML2CAM3...
CALM1CALMCAMCAM1CALM2CAM2CAMBCALM3CALML2CAM3CAMCCAMIII

Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
NIH Common Fund Data Resources
PHAROS:  P0DP23
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Sodium channel protein type 5 subunit alphaB [auth F], D [auth G], F [auth H], H [auth I], J157Homo sapiensMutation(s): 0 
Gene Names: SCN5A
Find proteins for Q14524 (Homo sapiens)
Explore Q14524 
Go to UniProtKB:  Q14524
NIH Common Fund Data Resources
PHAROS:  Q14524
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
BA [auth H], IA [auth J], O [auth A], P [auth F], U [auth G]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
PO4
Query on PO4

Download Ideal Coordinates CCD File 
T [auth B], Z [auth C]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
AA [auth C] , CA [auth D] , DA [auth D] , EA [auth D] , FA [auth D] , GA [auth E] , HA [auth E] , K [auth A] , 
AA [auth C],  CA [auth D],  DA [auth D],  EA [auth D],  FA [auth D],  GA [auth E],  HA [auth E],  K [auth A],  L [auth A],  M [auth A],  N [auth A],  Q [auth B],  R [auth B],  S [auth B],  V [auth C],  W [auth C],  X [auth C],  Y [auth C]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, C [auth B], E [auth C], G [auth D], I [auth E]L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.215 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.128α = 90
b = 99.006β = 106.11
c = 109.281γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesRO1 HL050411-15A1

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-03
    Type: Initial release
  • Version 1.1: 2014-12-10
    Changes: Derived calculations
  • Version 1.2: 2015-04-08
    Changes: Derived calculations
  • Version 1.3: 2017-09-27
    Changes: Author supporting evidence, Derived calculations, Refinement description, Source and taxonomy
  • Version 1.4: 2019-12-04
    Changes: Author supporting evidence