Stromal interaction molecule 1 - Q13586 (STIM1_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q13586: 5
 
Function
Plays a role in mediating store-operated Ca(2+) entry (SOCE), a Ca(2+) influx following depletion of intracellular Ca(2+) stores (PubMed:15866891, PubMed:16005298, PubMed:16208375, PubMed:16537481, PubMed:16733527, PubMed:16766533, PubMed:16807233, PubMed:18854159, PubMed:19249086, PubMed:22464749, PubMed:24069340, PubMed:24351972, PubMed:24591628, PubMed:26322679, PubMed:25326555, PubMed:28219928). Acts as Ca(2+) sensor in the endoplasmic reticulum via its EF-hand domain. Upon Ca(2+) depletion, translocates from the endoplasmic reticulum to the plasma membrane where it activates the Ca(2+) release-activated Ca(2+) (CRAC) channel subunit ORAI1 (PubMed:16208375, PubMed:16537481). Involved in enamel formation (PubMed:24621671). Activated following interaction with STIMATE, leading to promote STIM1 conformational switch (PubMed:26322679). UniProt
Pathway Maps
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Subunit Structure
Monomer in the presence of Ca(2+); it oligomerizes in absence of Ca(2+) (PubMed:18854159). Forms homooligomers and heterooligomers with STIM2 (PubMed:11463338, PubMed:11983428, PubMed:18854159, PubMed:22451904, PubMed:24351972, PubMed:24069340). Interacts (via the transmembrane region and the SOAR/CAD domain) with SPPL3; the interaction promotes the binding of STIM1 to ORAI1 (PubMed:25384971). Interacts with ORAI1 (PubMed:17905723, PubMed:19249086, PubMed:27185316, PubMed:24351972, PubMed:28219928). Interacts with MAPRE1; probably required for targeting to the growing microtubule plus ends (PubMed:19632184). Interacts with CRACR2A/EFCAB4B; the interaction is direct and takes place in absence of Ca(2+) (PubMed:20418871). Forms a complex with CRACR2A/EFCAB4B and ORAI1 at low concentration of Ca(2+), the complex dissociates at elevated Ca(2+) concentrations (PubMed:20418871). Interacts with SARAF, promoting a slow inactivation of STIM1-dependent SOCE activity, possibly by facilitating the deoligomerization of STIM1 (PubMed:22464749). Interacts with ASPH (isoform 8) (PubMed:22586105). Interacts with SLC35G1; intracellular Ca(2+)-dependent. May interact with ATP1A1, ATP2A2, ATP2B1, ATP2B4, KPNB1 and XPO1; through SLC35G1 (PubMed:22084111). Interacts with TMEM203 (PubMed:25996873). Interacts with STIMATE, promoting STIM1 conformational switch (PubMed:26322679). Interacts with TMEM178A (By similarity). Interacts with CASQ1 (via C-terminal end and preferentially with the monomeric form); this interaction increases in response to a depletion of intracellular calcium, decreases both STIM1 aggregation and clustering, interaction of STIM1 with ORAI1 and store-operated Ca(2+) entry (SOCE) activity (PubMed:27185316). UniProt
Domain
The STIM1 Orai1-activating region/CRAC-activating domain (SOAR/CAD) mediates interaction with ORAI1 to activate the channel. UniProt
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Data origin/color codes
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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Validation Track

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Data in red indicates combined ranges of Homology Models from SBKB   and the Protein Model Portal  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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