Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 17.42 kDa 
• Atom Count: 1222 
• Modelled Residue Count: 150 
• Deposited Residue Count: 150 
• Unique protein chains: 1

2K60

NMR structure of calcium-loaded STIM1 EF-SAM

• PDB DOI: 10.2210/pdb2K60/pdb
• BMRB: 15851

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-07-02 Released: 2008-10-07 
• Deposition Author(s): Stathopulos, P.B., Ikura, M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 250 
• Conformers Submitted: 20 
• Selection Criteria: 20 structures for lowest energy 

Literature

Structural and mechanistic insights into STIM1-mediated initiation of store-operated calcium entry.

Stathopulos, P.B., Zheng, L., Li, G.Y., Plevin, M.J., Ikura, M.

(2008) Cell 135: 110-122

• PubMed: 18854159 
• DOI: 10.1016/j.cell.2008.08.006
• Primary Citation of Related Structures:  
  2K60


• PubMed Abstract: 
  

Stromal interaction molecule-1 (STIM1) activates store-operated Ca2+ entry (SOCE) in response to diminished luminal Ca2+ levels. Here, we present the atomic structure of the Ca2+-sensing region of STIM1 consisting of the EF-hand and sterile alpha motif (SAM) domains (EF-SAM). The canonical EF-hand is paired with a previously unidentified EF-hand. Together, the EF-hand pair mediates mutually indispensable hydrophobic interactions between the EF-hand and SAM domains. Structurally critical mutations in the canonical EF-hand, "hidden" EF-hand, or SAM domain disrupt Ca2+ sensitivity in oligomerization via destabilization of the entire EF-SAM entity. In mammalian cells, EF-SAM destabilization mutations within full-length STIM1 induce punctae formation and activate SOCE independent of luminal Ca2+. We provide atomic resolution insight into the molecular basis for STIM1-mediated SOCE initiation and show that the folded/unfolded state of the Ca2+-sensing region of STIM is crucial to SOCE regulation.

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Organizational Affiliation: 

Division of Signaling Biology, Ontario Cancer Institute and Department of Medical Biophysics, University of Toronto, Toronto Medical Discovery Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (Stromal interaction molecule 1)	A	150	Homo sapiens	Mutation(s): 0  Gene Names: STIM1, GOK
UniProt & NIH Common Fund Data Resources
Find proteins for Q13586 (Homo sapiens) Explore Q13586  Go to UniProtKB:  Q13586
PHAROS:  Q13586

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 250 
• Conformers Submitted: 20 
• Selection Criteria: 20 structures for lowest energy 
• OLDERADO: 2K60 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-07-02 
• Released Date: 2008-10-07 
Deposition Author(s): Stathopulos, P.B., Ikura, M.

Revision History  

• Version 1.0: 2008-10-07
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2013-07-24
  Changes: Database references