4HKR

Calcium release-activated calcium (CRAC) channel ORAI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.35 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.278 
  • R-Value Observed: 0.278 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the calcium release-activated calcium channel Orai.

Hou, X.Pedi, L.Diver, M.M.Long, S.B.

(2012) Science 338: 1308-1313

  • DOI: 10.1126/science.1228757
  • Primary Citation of Related Structures:  
    4HKR, 4HKS

  • PubMed Abstract: 
  • The plasma membrane protein Orai forms the pore of the calcium release-activated calcium (CRAC) channel and generates sustained cytosolic calcium signals when triggered by depletion of calcium from the endoplasmic reticulum. The crystal structure of ...

    The plasma membrane protein Orai forms the pore of the calcium release-activated calcium (CRAC) channel and generates sustained cytosolic calcium signals when triggered by depletion of calcium from the endoplasmic reticulum. The crystal structure of Orai from Drosophila melanogaster, determined at 3.35 angstrom resolution, reveals that the calcium channel is composed of a hexameric assembly of Orai subunits arranged around a central ion pore. The pore traverses the membrane and extends into the cytosol. A ring of glutamate residues on its extracellular side forms the selectivity filter. A basic region near the intracellular side can bind anions that may stabilize the closed state. The architecture of the channel differs markedly from other ion channels and gives insight into the principles of selective calcium permeation and gating.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium release-activated calcium channel protein 1AB214Drosophila melanogasterMutation(s): 4 
Gene Names: olf186-FCRACM1olf186CG11430Orai
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Calcium Ion-Selective
Protein: 
Orai Calcium release-activated calcium (CRAC) channel
Find proteins for Q9U6B8 (Drosophila melanogaster)
Explore Q9U6B8 
Go to UniProtKB:  Q9U6B8
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BA
Query on BA

Download CCD File 
A
BARIUM ION
Ba
XDFCIPNJCBUZJN-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
FE
Query on FE

Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.35 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.278 
  • R-Value Observed: 0.278 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.91α = 90
b = 117.91β = 90
c = 117.91γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
SHARPphasing
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2012-10-15 
  • Released Date: 2012-11-28 
  • Deposition Author(s): Long, S.B., Hou, X.

Revision History 

  • Version 1.0: 2012-11-28
    Type: Initial release
  • Version 1.1: 2012-12-12
    Changes: Database references
  • Version 1.2: 2012-12-26
    Changes: Database references