5IWN

Bacterial sodium channel pore domain, high bromide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.75 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Unfolding of a Temperature-Sensitive Domain Controls Voltage-Gated Channel Activation.

Arrigoni, C.Rohaim, A.Shaya, D.Findeisen, F.Stein, R.A.Nurva, S.R.Mishra, S.Mchaourab, H.S.Minor, D.L.

(2016) Cell 164: 922-936

  • DOI: https://doi.org/10.1016/j.cell.2016.02.001
  • Primary Citation of Related Structures:  
    5HJ8, 5HK6, 5HK7, 5HKD, 5IWN, 5IWO

  • PubMed Abstract: 

    Voltage-gated ion channels (VGICs) are outfitted with diverse cytoplasmic domains that impact function. To examine how such elements may affect VGIC behavior, we addressed how the bacterial voltage-gated sodium channel (BacNa(V)) C-terminal cytoplasmic domain (CTD) affects function. Our studies show that the BacNa(V) CTD exerts a profound influence on gating through a temperature-dependent unfolding transition in a discrete cytoplasmic domain, the neck domain, proximal to the pore. Structural and functional studies establish that the BacNa(V) CTD comprises a bi-partite four-helix bundle that bears an unusual hydrophilic core whose integrity is central to the unfolding mechanism and that couples directly to the channel activation gate. Together, our findings define a general principle for how the widespread four-helix bundle cytoplasmic domain architecture can control VGIC responses, uncover a mechanism underlying the diverse BacNa(V) voltage dependencies, and demonstrate that a discrete domain can encode the temperature-dependent response of a channel.


  • Organizational Affiliation

    Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ion transport protein
A, B, C, D
152Alkalilimnicola ehrlichiiMutation(s): 0 
Gene Names: Mlg_0322
Membrane Entity: Yes 
UniProt
Find proteins for Q0ABW0 (Alkalilimnicola ehrlichii (strain ATCC BAA-1101 / DSM 17681 / MLHE-1))
Explore Q0ABW0 
Go to UniProtKB:  Q0ABW0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ0ABW0
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.75 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 157.4α = 90
b = 160.87β = 90
c = 167.35γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-03-30
    Type: Initial release
  • Version 1.1: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description