7KR5

Cryo-EM structure of the CRAC channel Orai in an open conformation; H206A gain-of-function mutation in complex with an antibody


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Cryo-EM structure of the calcium release-activated calcium channel Orai in an open conformation.

Hou, X.Outhwaite, I.R.Pedi, L.Long, S.B.

(2020) Elife 9

  • DOI: 10.7554/eLife.62772
  • Primary Citation of Related Structures:  
    7KR5

  • PubMed Abstract: 
  • The calcium release-activated calcium channel Orai regulates Ca 2+ entry into non-excitable cells and is required for proper immune function. While the channel typically opens following Ca 2+ release from the endoplasmic reticulum, certain pathologic mutations render the channel constitutively open ...

    The calcium release-activated calcium channel Orai regulates Ca 2+ entry into non-excitable cells and is required for proper immune function. While the channel typically opens following Ca 2+ release from the endoplasmic reticulum, certain pathologic mutations render the channel constitutively open. Previously, using one such mutation (H206A), we obtained low (6.7 Å) resolution X-ray structural information on Drosophila melanogaster Orai in an open conformation (Hou et al., 2018). Here we present a structure of this open conformation at 3.3 Å resolution using fiducial-assisted cryo-electron microscopy. The improved structure reveals the conformations of amino acids in the open pore, which dilates by outward movements of subunits. A ring of phenylalanine residues repositions to expose previously shielded glycine residues to the pore without significant rotational movement of the associated helices. Together with other hydrophobic amino acids, the phenylalanines act as the channel's gate. Structured M1-M2 turrets, not evident previously, form the channel's extracellular entrance.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium release-activated calcium channel protein 1 ABCDEF214Drosophila melanogasterMutation(s): 3 
Gene Names: OraiCRACM1olf186-FCG11430
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Calcium Ion-Selective
Protein: 
Orai Calcium release-activated calcium (CRAC) channel, H206A mutant in an open conformation
Find proteins for Q9U6B8 (Drosophila melanogaster)
Explore Q9U6B8 
Go to UniProtKB:  Q9U6B8
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
19B5 Fab heavy chain HMO244Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
19B5 Fab light chain LNP232Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM131921
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM094273

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-09
    Type: Initial release