2MAK

Solution structure of the STIM1 CC1-CC2 homodimer in complex with two Orai1 C-terminal domains.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

STIM1/Orai1 coiled-coil interplay in the regulation of store-operated calcium entry.

Stathopulos, P.B.Schindl, R.Fahrner, M.Zheng, L.Gasmi-Seabrook, G.M.Muik, M.Romanin, C.Ikura, M.

(2013) Nat Commun 4: 2963-2963

  • DOI: 10.1038/ncomms3963
  • Primary Citation of Related Structures:  
    2MAK, 2MAJ

  • PubMed Abstract: 
  • Orai1 calcium channels in the plasma membrane are activated by stromal interaction molecule-1 (STIM1), an endoplasmic reticulum calcium sensor, to mediate store-operated calcium entry (SOCE). The cytosolic region of STIM1 contains a long putative coiled-coil (CC)1 segment and shorter CC2 and CC3 domains ...

    Orai1 calcium channels in the plasma membrane are activated by stromal interaction molecule-1 (STIM1), an endoplasmic reticulum calcium sensor, to mediate store-operated calcium entry (SOCE). The cytosolic region of STIM1 contains a long putative coiled-coil (CC)1 segment and shorter CC2 and CC3 domains. Here we present solution nuclear magnetic resonance structures of a trypsin-resistant CC1-CC2 fragment in the apo and Orai1-bound states. Each CC1-CC2 subunit forms a U-shaped structure that homodimerizes through antiparallel interactions between equivalent α-helices. The CC2:CC2' helix pair clamps two identical acidic Orai1 C-terminal helices at opposite ends of a hydrophobic/basic STIM-Orai association pocket. STIM1 mutants disrupting CC1:CC1' interactions attenuate, while variants promoting CC1 stability spontaneously activate Orai1 currents. CC2 mutations cause remarkable variability in Orai1 activation because of a dual function in binding Orai1 and autoinhibiting STIM1 oligomerization via interactions with CC3. We conclude that SOCE is activated through dynamic interplay between STIM1 and Orai1 helices.


    Organizational Affiliation

    University Health Network and Department of Medical Biophysics, Campbell Family Cancer Research Institute, Ontario Cancer Institute, University of Toronto, Room 4-804, MaRS TMDT, 101 College Street, Toronto, Ontario, Canada M5G 1L7.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Stromal interaction molecule 1A, C82Homo sapiensMutation(s): 0 
Gene Names: STIM1GOK
Find proteins for Q13586 (Homo sapiens)
Explore Q13586 
Go to UniProtKB:  Q13586
NIH Common Fund Data Resources
PHAROS:  Q13586
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium release-activated calcium channel protein 1B, D23Homo sapiensMutation(s): 0 
Gene Names: ORAI1CRACM1TMEM142A
Find proteins for Q96D31 (Homo sapiens)
Explore Q96D31 
Go to UniProtKB:  Q96D31
NIH Common Fund Data Resources
PHAROS:  Q96D31
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2MAK Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-15
    Type: Initial release