4DCK

Crystal structure of the C-terminus of voltage-gated sodium channel in complex with FGF13 and CaM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structure of the Ternary Complex of a NaV C-Terminal Domain, a Fibroblast Growth Factor Homologous Factor, and Calmodulin.

Wang, C.Chung, B.C.Yan, H.Lee, S.Y.Pitt, G.S.

(2012) Structure 20: 1167-1176

  • DOI: 10.1016/j.str.2012.05.001

  • PubMed Abstract: 
  • Voltage-gated Na⁺ (Na(V)) channels initiate neuronal action potentials. Na(V) channels are composed of a transmembrane domain responsible for voltage-dependent Na⁺ conduction and a cytosolic C-terminal domain (CTD) that regulates channel function thr ...

    Voltage-gated Na⁺ (Na(V)) channels initiate neuronal action potentials. Na(V) channels are composed of a transmembrane domain responsible for voltage-dependent Na⁺ conduction and a cytosolic C-terminal domain (CTD) that regulates channel function through interactions with many auxiliary proteins, including fibroblast growth factor homologous factors (FHFs) and calmodulin (CaM). Most ion channel structural studies have focused on mechanisms of permeation and voltage-dependent gating but less is known about how intracellular domains modulate channel function. Here we report the crystal structure of the ternary complex of a human Na(V) CTD, an FHF, and Ca²⁺-free CaM at 2.2 Å. Combined with functional experiments based on structural insights, we present a platform for understanding the roles of these auxiliary proteins in Na(V) channel regulation and the molecular basis of mutations that lead to neuronal and cardiac diseases. Furthermore, we identify a critical interaction that contributes to the specificity of individual Na(V) CTD isoforms for distinctive FHFs.


    Organizational Affiliation

    Division of Cardiology, Department of Medicine, Duke University Medical Center, 2 Genome Ct, Durham, NC 27710, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sodium channel protein type 5 subunit alpha
A
168Homo sapiensGene Names: SCN5A
Find proteins for Q14524 (Homo sapiens)
Go to Gene View: SCN5A
Go to UniProtKB:  Q14524
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Calmodulin
B
149Homo sapiensGene Names: CALM1 (CALM, CAM, CAM1)
Find proteins for P0DP23 (Homo sapiens)
Go to Gene View: CALM1
Go to UniProtKB:  P0DP23
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Fibroblast growth factor 13
C
192Homo sapiensGene Names: FGF13 (FHF2)
Find proteins for Q92913 (Homo sapiens)
Go to Gene View: FGF13
Go to UniProtKB:  Q92913
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.210 
  • Space Group: P 21 3
Unit Cell:
Length (Å)Angle (°)
a = 126.041α = 90.00
b = 126.041β = 90.00
c = 126.041γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data collection
PHENIXmodel building
HKL-2000data scaling
PHENIXrefinement
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-27
    Type: Initial release
  • Version 1.1: 2012-07-25
    Type: Database references