4JC5

Immune activator bound to receptor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Species-specific detection of the antiviral small-molecule compound CMA by STING.

Cavlar, T.Deimling, T.Ablasser, A.Hopfner, K.P.Hornung, V.

(2013) Embo J. 32: 1440-1450

  • DOI: 10.1038/emboj.2013.86

  • PubMed Abstract: 
  • Extensive research on antiviral small molecules starting in the early 1970s has led to the identification of 10-carboxymethyl-9-acridanone (CMA) as a potent type I interferon (IFN) inducer. Up to date, the mode of action of this antiviral molecule ha ...

    Extensive research on antiviral small molecules starting in the early 1970s has led to the identification of 10-carboxymethyl-9-acridanone (CMA) as a potent type I interferon (IFN) inducer. Up to date, the mode of action of this antiviral molecule has remained elusive. Here we demonstrate that CMA mediates a cell-intrinsic type I IFN response, depending on the ER-resident protein STING. CMA directly binds to STING and triggers a strong antiviral response through the TBK1/IRF3 route. Interestingly, while CMA displays extraordinary activity in phosphorylating IRF3 in the murine system, CMA fails to activate human cells that are otherwise responsive to STING ligands. This failure to activate human STING can be ascribed to its inability to bind to the C-terminal ligand-binding domain of human STING. Crystallographic studies show that two CMA molecules bind to the central Cyclic diguanylate (c-diGMP)-binding pocket of the STING dimer and fold the lid region in a fashion similar, but partially distinct, to c-diGMP. Altogether, these results provide novel insight into ligand-sensing properties of STING and, furthermore, unravel unexpected species-specific differences of this innate sensor.


    Organizational Affiliation

    Unit for Clinical Biochemistry, Institute for Clinical Chemistry and Clinical Pharmacology, University Hospital, University of Bonn, Bonn, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transmembrane protein 173
A, B
200Mus musculusMutation(s): 0 
Gene Names: Tmem173 (Eris Mita, Mpys, Sting)
Find proteins for Q3TBT3 (Mus musculus)
Go to UniProtKB:  Q3TBT3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1K5
Query on 1K5

Download SDF File 
Download CCD File 
A, B
(9-oxoacridin-10(9H)-yl)acetic acid
C15 H11 N O3
UOMKBIIXHQIERR-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.209 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 108.540α = 90.00
b = 108.540β = 90.00
c = 100.830γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
PHASERphasing
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-08
    Type: Initial release
  • Version 1.1: 2013-05-29
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Advisory, Refinement description