6NT7

Cryo-EM structure of full-length chicken STING in the cGAMP-bound dimeric state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Cryo-EM structures of STING reveal its mechanism of activation by cyclic GMP-AMP.

Shang, G.Zhang, C.Chen, Z.J.Bai, X.C.Zhang, X.

(2019) Nature 567: 389-393

  • DOI: 10.1038/s41586-019-0998-5
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Infections by pathogens that contain DNA trigger the production of type-I interferons and inflammatory cytokines through cyclic GMP-AMP synthase, which produces 2'3'-cyclic GMP-AMP (cGAMP) that binds to and activates stimulator of interferon genes (S ...

    Infections by pathogens that contain DNA trigger the production of type-I interferons and inflammatory cytokines through cyclic GMP-AMP synthase, which produces 2'3'-cyclic GMP-AMP (cGAMP) that binds to and activates stimulator of interferon genes (STING; also known as TMEM173, MITA, ERIS and MPYS) 1-8 . STING is an endoplasmic-reticulum membrane protein that contains four transmembrane helices followed by a cytoplasmic ligand-binding and signalling domain 9-13 . The cytoplasmic domain of STING forms a dimer, which undergoes a conformational change upon binding to cGAMP 9,14 . However, it remains unclear how this conformational change leads to STING activation. Here we present cryo-electron microscopy structures of full-length STING from human and chicken in the inactive dimeric state (about 80 kDa in size), as well as cGAMP-bound chicken STING in both the dimeric and tetrameric states. The structures show that the transmembrane and cytoplasmic regions interact to form an integrated, domain-swapped dimeric assembly. Closure of the ligand-binding domain, induced by cGAMP, leads to a 180° rotation of the ligand-binding domain relative to the transmembrane domain. This rotation is coupled to a conformational change in a loop on the side of the ligand-binding-domain dimer, which leads to the formation of the STING tetramer and higher-order oligomers through side-by-side packing. This model of STING oligomerization and activation is supported by our structure-based mutational analyses.


    Organizational Affiliation

    Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA. Zhijian.Chen@UTSouthwestern.edu.,Center for Inflammation Research, University of Texas Southwestern Medical Center, Dallas, TX, USA. Zhijian.Chen@UTSouthwestern.edu.,Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX, USA.,Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA. Xiaochen.Bai@UTSouthwestern.edu.,Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA. Xiaochen.Bai@UTSouthwestern.edu.,Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA.,Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX, USA. Xuewu.Zhang@UTSouthwestern.edu.,Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA. Xuewu.Zhang@UTSouthwestern.edu.,Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA. Zhijian.Chen@UTSouthwestern.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stimulator of interferon genes protein
A, B
392Gallus gallusMutation(s): 0 
Gene Names: TMEM173 (STING)
Find proteins for E1C7U0 (Gallus gallus)
Go to Gene View: TMEM173
Go to UniProtKB:  E1C7U0
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
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM088197
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR35GM130289
Howard Hughes Medical InstituteUnited States--
Welch FoundationUnited StatesI-1389
Welch FoundationUnited StatesI-1702
Welch FoundationUnited StatesI-1944

Revision History 

  • Version 1.0: 2019-03-06
    Type: Initial release
  • Version 1.1: 2019-03-20
    Type: Data collection, Database references
  • Version 1.2: 2019-04-03
    Type: Data collection, Database references