4KSY

Crystal structure of STING in complex with cGAMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.881 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.161 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Cyclic GMP-AMP Containing Mixed Phosphodiester Linkages Is An Endogenous High-Affinity Ligand for STING.

Zhang, X.Shi, H.Wu, J.Zhang, X.Sun, L.Chen, C.Chen, Z.J.

(2013) Mol.Cell 51: 226-235

  • DOI: 10.1016/j.molcel.2013.05.022

  • PubMed Abstract: 
  • The presence of microbial or self DNA in the cytoplasm of mammalian cells is a danger signal detected by the DNA sensor cyclic-GMP-AMP (cGAMP) synthase (cGAS), which catalyzes the production of cGAMP that in turn serves as a second messenger to activ ...

    The presence of microbial or self DNA in the cytoplasm of mammalian cells is a danger signal detected by the DNA sensor cyclic-GMP-AMP (cGAMP) synthase (cGAS), which catalyzes the production of cGAMP that in turn serves as a second messenger to activate innate immune responses. Here we show that endogenous cGAMP in mammalian cells contains two distinct phosphodiester linkages, one between 2'-OH of GMP and 5'-phosphate of AMP, and the other between 3'-OH of AMP and 5'-phosphate of GMP. This molecule, termed 2'3'-cGAMP, is unique in that it binds to the adaptor protein STING with a much greater affinity than cGAMP molecules containing other combinations of phosphodiester linkages. The crystal structure of STING bound to 2'3'-cGAMP revealed the structural basis of this high-affinity binding and a ligand-induced conformational change in STING that may underlie its activation.


    Organizational Affiliation

    Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9148, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stimulator of interferon genes protein
A
242Homo sapiensGene 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
1SY
Query on 1SY

Download SDF File 
Download CCD File 
A
cGAMP
2',3' cGAMP, c-GMP-AMP, c[G(2',5')pA(3',5')p]
C20 H24 N10 O13 P2
XRILCFTWUCUKJR-INFSMZHSSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
1SYKd: 3.79 nM BINDINGMOAD
1SYKd: 3.79 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.881 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.161 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 89.522α = 90.00
b = 77.927β = 96.97
c = 35.974γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXrefinement
HKL-2000data scaling
HKL-3000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-06-12
    Type: Initial release
  • Version 1.1: 2013-07-17
    Type: Database references
  • Version 1.2: 2013-08-07
    Type: Database references
  • Version 1.3: 2015-08-05
    Type: Non-polymer description