Structure of pSTING complex

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.222 

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Crystal structures of porcine STINGCBD-CDN complexes reveal the mechanism of ligand recognition and discrimination of STING proteins.

Cong, X.Yuan, Z.Du, Y.Wu, B.Lu, D.Wu, X.Zhang, Y.Li, F.Wei, B.Li, J.Wu, J.Xu, S.Wang, J.Qi, J.Shang, G.Gu, L.

(2019) J Biol Chem 294: 11420-11432

  • DOI: https://doi.org/10.1074/jbc.RA119.007367
  • Primary Citation of Related Structures:  
    6A03, 6A04, 6A05, 6A06, 6IYF

  • PubMed Abstract: 

    The cyclic dinucleotide (CDN)- st imulator of in terferon g enes (STING) pathway plays an important role in the detection of viral and bacterial pathogens in animals. Previous studies have shown that the metazoan second messenger cyclic [G(2',5')pA(3',5')p] (2',3'-cGAMP) generated by cyclic GMP-AMP synthase cGAS binds STING with high affinity compared with bacterial CDNs such as c-di-GMP, c-di-AMP, and 3',3'-cGAMP. Despite recent progress indicating that the CDN-binding domain (CBD) of dimeric STING binds asymmetric 2',3'-cGAMP preferentially over symmetric 3',3'-CDNs, it remains an open question whether STING molecules, such as human STING, adopt a symmetric dimeric conformation to efficiently engage its asymmetric ligand. Here, structural studies of the CBD from porcine STING (STING CBD ) in complex with CDNs at 1.76-2.6 Å resolution revealed that porcine STING CBD , unlike its human and mouse counterparts, can adopt an asymmetric ligand-binding pocket to accommodate the CDNs. We observed that the extensive interactions and shape complementarity between asymmetric 2',3'-cGAMP and the ligand-binding pocket make it the most preferred ligand for porcine STING and that geometry constraints limit the binding between symmetric 3',3'-CDN and porcine STING. The ligand-discrimination mechanism of porcine STING observed here expands our understanding of how the CDN-STING pathway is activated and of its role in antiviral defense.

  • Organizational Affiliation

    State Key Laboratory of Microbial Technology, Shandong University, Jinan 250100, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Stimulator of interferon genes protein
A, B
201Sus scrofaMutation(s): 0 
Gene Names: TMEM173STING
Find proteins for B8XX90 (Sus scrofa)
Explore B8XX90 
Go to UniProtKB:  B8XX90
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB8XX90
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 1YD

Download Ideal Coordinates CCD File 
E [auth A]2-amino-9-[(2R,3R,3aR,5S,7aS,9R,10R,10aR,12R,14aS)-9-(6-amino-9H-purin-9-yl)-3,5,10,12-tetrahydroxy-5,12-dioxidooctahydro-2H,7H-difuro[3,2-d:3',2'-j][1,3,7,9,2,8]tetraoxadiphosphacyclododecin-2-yl]-1,9-dihydro-6H-purin-6-one
C20 H24 N10 O13 P2
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
F [auth B]
O4 S
Binding Affinity Annotations 
IDSourceBinding Affinity
1YD Binding MOAD:  6A05 Kd: 12.8 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.222 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.405α = 90
b = 64.741β = 90
c = 100.953γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China--

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-19
    Type: Initial release
  • Version 1.1: 2019-08-07
    Changes: Data collection, Database references
  • Version 1.2: 2024-03-27
    Changes: Data collection, Database references