4G7Y

Crystal structure of voltage sensing domain of Ci-VSP with fragment antibody (R217E, 2.8 A)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural mechanism of voltage-dependent gating in an isolated voltage-sensing domain.

Li, Q.Wanderling, S.Paduch, M.Medovoy, D.Singharoy, A.McGreevy, R.Villalba-Galea, C.A.Hulse, R.E.Roux, B.Schulten, K.Kossiakoff, A.Perozo, E.

(2014) Nat. Struct. Mol. Biol. 21: 244-252

  • DOI: 10.1038/nsmb.2768
  • Primary Citation of Related Structures:  4G7V, 4G80

  • PubMed Abstract: 
  • The transduction of transmembrane electric fields into protein motion has an essential role in the generation and propagation of cellular signals. Voltage-sensing domains (VSDs) carry out these functions through reorientations of positive charges in ...

    The transduction of transmembrane electric fields into protein motion has an essential role in the generation and propagation of cellular signals. Voltage-sensing domains (VSDs) carry out these functions through reorientations of positive charges in the S4 helix. Here, we determined crystal structures of the Ciona intestinalis VSD (Ci-VSD) in putatively active and resting conformations. S4 undergoes an ~5-Å displacement along its main axis, accompanied by an ~60° rotation. This movement is stabilized by an exchange in countercharge partners in helices S1 and S3 that generates an estimated net charge transfer of ~1 eo. Gating charges move relative to a ''hydrophobic gasket' that electrically divides intra- and extracellular compartments. EPR spectroscopy confirms the limited nature of S4 movement in a membrane environment. These results provide an explicit mechanism for voltage sensing and set the basis for electromechanical coupling in voltage-dependent enzymes and ion channels.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fragment antibody heavy chain
H
219N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fragment antibody light chain
L
211N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Voltage-sensor containing phosphatase
S
185Ciona intestinalisGene Names: Ci-VSP
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Voltage-sensing domain of a voltage-sensitive phosphatase (R217E mutant)
Find proteins for Q4W8A1 (Ciona intestinalis)
Go to UniProtKB:  Q4W8A1
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
L
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
LDA
Query on LDA

Download SDF File 
Download CCD File 
S
LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.206 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 121.010α = 90.00
b = 121.010β = 90.00
c = 229.570γ = 120.00
Software Package:
Software NamePurpose
SCALAdata scaling
REFMACrefinement
MOSFLMdata reduction
PHASERphasing
PHENIXrefinement
JBlucedata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-07-20 
  • Released Date: 2014-02-05 
  • Deposition Author(s): Li, Q.

Revision History 

  • Version 1.0: 2014-02-05
    Type: Initial release
  • Version 1.1: 2017-11-15
    Type: Refinement description
  • Version 1.2: 2017-12-13
    Type: Database references