4QXP

Crystal structure of hSTING(G230I) in complex with DMXAA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.51 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Binding-Pocket and Lid-Region Substitutions Render Human STING Sensitive to the Species-Specific Drug DMXAA.

Gao, P.Zillinger, T.Wang, W.Ascano, M.Dai, P.Hartmann, G.Tuschl, T.Deng, L.Barchet, W.Patel, D.J.

(2014) Cell Rep 8: 1668-1676

  • DOI: 10.1016/j.celrep.2014.08.010
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The drug DMXAA (5,6-dimethylxanthenone-4-acetic acid) showed therapeutic promise against solid tumors in mouse models but subsequently failed in human clinical trials. DMXAA was later discovered to activate mouse, but not human, STING, an adaptor pro ...

    The drug DMXAA (5,6-dimethylxanthenone-4-acetic acid) showed therapeutic promise against solid tumors in mouse models but subsequently failed in human clinical trials. DMXAA was later discovered to activate mouse, but not human, STING, an adaptor protein in the cyclic dinucleotide cGAMP-mediated signaling pathway, inducing type I interferon expression. To facilitate the development of compounds that target human STING, we combined structural, biophysical, and cellular assays to study mouse and human chimeric proteins and their interaction with DMXAA. We identified a single substitution (G230I) that enables a DMXAA-induced conformational transition of hSTING from an inactive "open" to an active "closed" state. We also identified a substitution within the binding pocket (Q266I) that cooperates with G230I and the previously identified S162A binding-pocket point substitution, rendering hSTING highly sensitive to DMXAA. These findings should facilitate the reciprocal engineering of DMXAA analogs that bind and stimulate wild-type hSTING and their exploitation for vaccine-adjuvant and anticancer drug development.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stimulator of interferon genes protein
A, B
188Homo sapiensMutation(s): 2 
Gene Names: TMEM173 (ERIS, MITA, STING)
Find proteins for Q86WV6 (Homo sapiens)
Go to Gene View: TMEM173
Go to UniProtKB:  Q86WV6
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1YE
Query on 1YE

Download SDF File 
Download CCD File 
A, B
(5,6-dimethyl-9-oxo-9H-xanthen-4-yl)acetic acid
C17 H14 O4
XGOYIMQSIKSOBS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.51 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.198 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 36.570α = 90.00
b = 77.919β = 98.97
c = 79.634γ = 90.00
Software Package:
Software NamePurpose
RAPDdata reduction
PHENIXrefinement
ADSCdata collection
PHASERphasing
RAPDdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2014-07-21 
  • Released Date: 2014-09-10 
  • Deposition Author(s): Gao, P., Patel, D.J.

Revision History 

  • Version 1.0: 2014-09-10
    Type: Initial release
  • Version 1.1: 2014-09-24
    Type: Database references
  • Version 1.2: 2014-10-08
    Type: Database references