2L5Y

NMR structure of calcium-loaded STIM2 EF-SAM.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Auto-inhibitory role of the EF-SAM domain of STIM proteins in store-operated calcium entry.

Zheng, L.Stathopulos, P.B.Schindl, R.Li, G.Y.Romanin, C.Ikura, M.

(2011) Proc Natl Acad Sci U S A 108: 1337-1342

  • DOI: https://doi.org/10.1073/pnas.1015125108
  • Primary Citation of Related Structures:  
    2L5Y

  • PubMed Abstract: 

    Stromal interaction molecules (STIM)s function as endoplasmic reticulum calcium (Ca(2+)) sensors that differentially regulate plasma membrane Ca(2+) release activated Ca(2+) channels in various cells. To probe the structural basis for the functional differences between STIM1 and STIM2 we engineered a series of EF-hand and sterile α motif (SAM) domain (EF-SAM) chimeras, demonstrating that the STIM1 Ca(2+)-binding EF-hand and the STIM2 SAM domain are major contributors to the autoinhibition of oligomerization in each respective isoform. Our nuclear magnetic resonance (NMR) derived STIM2 EF-SAM structure provides a rationale for an augmented stability, which involves a 54° pivot in the EF-hand:SAM domain orientation permissible by an expanded nonpolar cleft, ionic interactions, and an enhanced hydrophobic SAM core, unique to STIM2. Live cells expressing "super-unstable" or "super-stable" STIM1/STIM2 EF-SAM chimeras in the full-length context show a remarkable correlation with the in vitro data. Together, our data suggest that divergent Ca(2+)- and SAM-dependent stabilization of the EF-SAM fold contributes to the disparate regulation of store-operated Ca(2+) entry by STIM1 and STIM2.


  • Organizational Affiliation

    Division of Signaling Biology, Ontario Cancer Institute and Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada M5G 1L7.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Stromal interaction molecule 2150Homo sapiensMutation(s): 0 
Gene Names: KIAA1482STIM2
UniProt & NIH Common Fund Data Resources
Find proteins for Q9P246 (Homo sapiens)
Explore Q9P246 
Go to UniProtKB:  Q9P246
PHAROS:  Q9P246
GTEx:  ENSG00000109689 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9P246
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
B [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-02-05
    Changes: Data collection, Database references, Other
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references, Derived calculations