4O9B

The Structure of CC1-IH in human STIM1.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.604 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


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Literature

The inhibitory helix controls the intramolecular conformational switching of the C-terminus of STIM1.

Cui, B.Yang, X.Li, S.Lin, Z.Wang, Z.Dong, C.Shen, Y.

(2013) Plos One 8: e74735-e74735

  • DOI: 10.1371/journal.pone.0074735
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Store-operated Ca(2+) entry (SOCE) is a critical Ca(2+) signaling pathway in many cell types. After sensing Ca(2+) store depletion in the endoplasmic reticulum (ER) lumen, STIM1 (STromal Interaction Molecule 1) oligomerizes and then interacts with an ...

    Store-operated Ca(2+) entry (SOCE) is a critical Ca(2+) signaling pathway in many cell types. After sensing Ca(2+) store depletion in the endoplasmic reticulum (ER) lumen, STIM1 (STromal Interaction Molecule 1) oligomerizes and then interacts with and activates the Orai1 calcium channel. Our previous research has demonstrated that the inhibitory helix (IH) adjacent to the first coiled-coil region (CC1) of STIM1 may keep the whole C-terminus of STIM1 in an inactive state. However, the specific conformational change of CC1-IH that drives the transition of STIM1 from the resting state to the active state remains elusive. Herein, we report the structural analysis of CC1-IH, which revealed that the entire CC1-IH molecule forms a very long helix. Structural and biochemical analyses indicated that IH, and not the CC1 region, contributes to the oligomerization of STIM1. Small-angle X-ray scattering (SAXS) analysis suggested that the C-terminus of STIM1 including the IH region displays a collapsed conformation, whereas the construct without the IH region has an extended conformation. These two conformations may correspond to the conformational states of the C-terminus of STIM1 before and after activation. Taken together, our results provide direct biochemical evidence that the IH region controls the conformational switching of the C-terminus of STIM1.


    Organizational Affiliation

    State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, China ; College of Life Sciences, Nankai University, Tianjin, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stromal interaction molecule 1
A, B, C, D
104Homo sapiensMutation(s): 2 
Gene Names: STIM1 (GOK)
Find proteins for Q13586 (Homo sapiens)
Go to Gene View: STIM1
Go to UniProtKB:  Q13586
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CD
Query on CD

Download SDF File 
Download CCD File 
B, C, D
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.604 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.228 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 101.852α = 90.00
b = 101.852β = 90.00
c = 104.565γ = 120.00
Software Package:
Software NamePurpose
PHENIXphasing
HKL-2000data scaling
HKL-2000data reduction
MAR345dtbdata collection
PHENIXmodel building
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

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