Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 60.47 kDa 
• Atom Count: 3,063 
• Modelled Residue Count: 355 
• Deposited Residue Count: 530 
• Unique protein chains: 1

 4EF4

Crystal structure of STING CTD complex with c-di-GMP

• PDB DOI: 10.2210/pdb4EF4/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-03-29 Released: 2012-05-16 
• Deposition Author(s): Ouyang, S., Ru, H., Shaw, N., Jiang, Y., Niu, F., Zhu, Y., Qiu, W., Li, Y., Liu, Z.-J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.257 
• R-Value Work: 0.209 
• R-Value Observed: 0.211 

Literature

Structural analysis of the STING adaptor protein reveals a hydrophobic dimer interface and mode of cyclic di-GMP binding

Ouyang, S., Song, X., Wang, Y., Ru, H., Shaw, N., Jiang, Y., Niu, F., Zhu, Y., Qiu, W., Parvatiyar, K., Li, Y., Zhang, R., Cheng, G., Liu, Z.J.

(2012) Immunity 36: 1073-1086

• PubMed: 22579474 
• DOI: 10.1016/j.immuni.2012.03.019
• Primary Citation of Related Structures:  
  4EF4, 4EF5


• PubMed Abstract: 
  

STING is an essential signaling molecule for DNA and cyclic di-GMP (c-di-GMP)-mediated type I interferon (IFN) production via TANK-binding kinase 1 (TBK1) and interferon regulatory factor 3 (IRF3) pathway. It contains an N-terminal transmembrane region and a cytosolic C-terminal domain (CTD). Here, we describe crystal structures of STING CTD alone and complexed with c-di-GMP in a unique binding mode. The strictly conserved aa 153-173 region was shown to be cytosolic and participated in dimerization via hydrophobic interactions. The STING CTD functions as a dimer and the dimerization was independent of posttranslational modifications. Binding of c-di-GMP enhanced interaction of a shorter construct of STING CTD (residues 139-344) with TBK1. This suggests an extra TBK1 binding site, other than serine 358. This study provides a glimpse into the unique architecture of STING and sheds light on the mechanism of c-di-GMP-mediated TBK1 signaling.

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Organizational Affiliation: 

National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transmembrane protein 173	A, B	265	Homo sapiens	Mutation(s): 0  Gene Names: STING/MITA/ERIS/MPYS/TMEM173, STING1, ERIS, MITA, STING, TMEM173
UniProt & NIH Common Fund Data Resources
Find proteins for Q86WV6 (Homo sapiens) Explore Q86WV6  Go to UniProtKB:  Q86WV6
PHAROS:  Q86WV6

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
C2E	C [auth A]	9,9'-[(2R,3R,3aS,5S,7aR,9R,10R,10aS,12S,14aR)-3,5,10,12-tetrahydroxy-5,12-dioxidooctahydro-2H,7H-difuro[3,2-d:3',2'-j][1,3,7,9,2,8]tetraoxadiphosphacyclododecine-2,9-diyl]bis(2-amino-1,9-dihydro-6H-purin-6-one) C20 H24 N10 O14 P2 PKFDLKSEZWEFGL-MHARETSRSA-N
CA	D [auth A], E [auth B]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
C2E	Binding MOAD:  4EF4	Kd: 4420 (nM) from 1 assay(s)
	PDBBind:  4EF4	Kd: 4420 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.257 
• R-Value Work: 0.209 
• R-Value Observed: 0.211 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 61.375	α = 90
b = 72.84	β = 97.03
c = 62.44	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
SHELXS	phasing
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-05-16 
Deposition Author(s): Ouyang, S., Ru, H., Shaw, N., Jiang, Y., Niu, F., Zhu, Y., Qiu, W., Li, Y., Liu, Z.-J.

Revision History  

• Version 1.0: 2012-05-16
  Type: Initial release
  
• Version 1.1: 2012-05-23
  Changes: Database references
• Version 1.2: 2012-05-30
  Changes: Database references
• Version 1.3: 2013-07-03
  Changes: Database references