4JPZ

Voltage-gated sodium channel 1.2 C-terminal domain in complex with FGF13U and Ca2+/calmodulin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.02 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural analyses of Ca(2+)/CaM interaction with NaV channel C-termini reveal mechanisms of calcium-dependent regulation.

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

(2014) Nat Commun 5: 4896-4896

  • DOI: 10.1038/ncomms5896
  • Primary Citation of Related Structures:  
    4JQ0, 4JPZ

  • PubMed Abstract: 
  • Ca(2+) regulates voltage-gated Na(+) (NaV) channels, and perturbed Ca(2+) regulation of NaV function is associated with epilepsy syndromes, autism and cardiac arrhythmias. Understanding the disease mechanisms, however, has been hindered by a lack of ...

    Ca(2+) regulates voltage-gated Na(+) (NaV) channels, and perturbed Ca(2+) regulation of NaV function is associated with epilepsy syndromes, autism and cardiac arrhythmias. Understanding the disease mechanisms, however, has been hindered by a lack of structural information and competing models for how Ca(2+) affects NaV channel function. Here we report the crystal structures of two ternary complexes of a human NaV cytosolic C-terminal domain (CTD), a fibroblast growth factor homologous factor and Ca(2+)/calmodulin (Ca(2+)/CaM). These structures rule out direct binding of Ca(2+) to the NaV CTD and uncover new contacts between CaM and the NaV CTD. Probing these new contacts with biochemical and functional experiments allows us to propose a mechanism by which Ca(2+) could regulate NaV channels. Further, our model provides hints towards understanding the molecular basis of the neurologic disorders and cardiac arrhythmias caused by NaV channel mutations.


    Organizational Affiliation

    1] Ion Channel Research Unit, Department of Medicine, Duke University Medical Center, 2 Genome Court, Durham, North Carolina 27710, USA [2] Division of Cardiology, Department of Medicine, Duke University Medical Center, 2 Genome Court, Durham, North Carolina 27710, USA [3] Department of Pharmacology, Duke University Medical Center, 2 Genome Court, Durham, North Carolina 27710, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Fibroblast growth factor 13AE192Homo sapiensMutation(s): 0 
Gene Names: FGF13FHF2
Find proteins for Q92913 (Homo sapiens)
Explore Q92913 
Go to UniProtKB:  Q92913
NIH Common Fund Data Resources
PHAROS  Q92913
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Sodium channel protein type 2 subunit alphaBH184Homo sapiensMutation(s): 0 
Gene Names: SCN2ANAC2SCN2A1SCN2A2
Find proteins for Q99250 (Homo sapiens)
Explore Q99250 
Go to UniProtKB:  Q99250
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PHAROS  Q99250
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
CalmodulinCI149Homo 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.02 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 153.133α = 90
b = 86.106β = 100.9
c = 109.399γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SHELXmodel building
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
SHELXphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-16
    Type: Initial release
  • Version 1.1: 2014-10-22
    Changes: Database references
  • Version 1.2: 2014-12-03
    Changes: Structure summary
  • Version 1.3: 2017-11-15
    Changes: Refinement description