6MBA

Crystal Structure of Human Nav1.4 CTerminal Domain in Complex with apo Calmodulin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.204 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Ca2+-dependent regulation of sodium channels NaV1.4 and NaV1.5 is controlled by the post-IQ motif.

Yoder, J.B.Ben-Johny, M.Farinelli, F.Srinivasan, L.Shoemaker, S.R.Tomaselli, G.F.Gabelli, S.B.Amzel, L.M.

(2019) Nat Commun 10: 1514-1514

  • DOI: https://doi.org/10.1038/s41467-019-09570-7
  • Primary Citation of Related Structures:  
    6MBA, 6MC9

  • PubMed Abstract: 

    Skeletal muscle voltage-gated Na + channel (Na V 1.4) activity is subject to calmodulin (CaM) mediated Ca 2+ -dependent inactivation; no such inactivation is observed in the cardiac Na + channel (Na V 1.5). Taken together, the crystal structures of the Na V 1.4 C-terminal domain relevant complexes and thermodynamic binding data presented here provide a rationale for this isoform difference. A Ca 2+ -dependent CaM N-lobe binding site previously identified in Na V 1.5 is not present in Na V 1.4 allowing the N-lobe to signal other regions of the Na V 1.4 channel. Consistent with this mechanism, removing this binding site in Na V 1.5 unveils robust Ca 2+ -dependent inactivation in the previously insensitive isoform. These findings suggest that Ca 2+ -dependent inactivation is effected by CaM's N-lobe binding outside the Na V C-terminal while CaM's C-lobe remains bound to the Na V C-terminal. As the N-lobe binding motif of Na V 1.5 is a mutational hotspot for inherited arrhythmias, the contributions of mutation-induced changes in CDI to arrhythmia generation is an intriguing possibility.


  • Organizational Affiliation

    Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sodium channel protein type 4 subunit alpha171Homo sapiensMutation(s): 0 
Gene Names: SCN4A
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P35499 (Homo sapiens)
Explore P35499 
Go to UniProtKB:  P35499
PHAROS:  P35499
GTEx:  ENSG00000007314 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35499
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Calmodulin-1149Rattus norvegicusMutation(s): 0 
Gene Names: Calm1CalmCamCam1CaMI
UniProt
Find proteins for P0DP29 (Rattus norvegicus)
Explore P0DP29 
Go to UniProtKB:  P0DP29
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DP29
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
TRS
Query on TRS

Download Ideal Coordinates CCD File 
I [auth B]2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
EDO
Query on EDO

Download Ideal Coordinates CCD File 
G [auth B]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CO3
Query on CO3

Download Ideal Coordinates CCD File 
H [auth B]CARBONATE ION
C O3
BVKZGUZCCUSVTD-UHFFFAOYSA-L
CL
Query on CL

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth B],
F [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.204 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.72α = 90
b = 29.041β = 123.65
c = 94.991γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United States5R01HL128743

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-10
    Type: Initial release
  • Version 1.1: 2019-04-17
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description