Biological Assembly 1  

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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: 47.18 kDa 
• Atom Count: 2970 
• Residue Count: 360 
• Unique protein chains: 1

4KC0

mSTING

• DOI: 10.2210/pdb4KC0/pdb
• Entry: 4KC0 supersedes: 4G3L

• Classification: IMMUNE SYSTEM
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-04-24 Released: 2013-05-29 
• Deposition Author(s): Chin, K.H., Su, Y.C., Tu, J.L., Chou, S.H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.251 
• R-Value Work: 0.194 
• R-Value Observed: 0.200 

Literature

Novel c-di-GMP recognition modes of the mouse innate immune adaptor protein STING

Chin, K.H., Tu, Z.L., Su, Y.C., Yu, Y.J., Chen, H.C., Lo, Y.C., Chen, C.P., Barber, G.N., Chuah, M.L., Liang, Z.X., Chou, S.H.

(2013) Acta Crystallogr D Biol Crystallogr 69: 352-366

• PubMed: 23519410 
• DOI: 10.1107/S0907444912047269
• Structures With Same Primary Citation


• PubMed Abstract: 
  

The mammalian ER protein STING (stimulator of interferon genes; also known as MITA, ERIS, MPYS or TMEM173) is an adaptor protein that links the detection of cytosolic dsDNA to the activation of TANK-binding kinase 1 (TBK1) and its downstream transcription factor interferon regulatory factor 3 (IFN3). Recently, STING itself has been found to be the direct receptor of bacterial c-di-GMP, and crystal structures of several human STING C-terminal domain (STING-CTD) dimers in the apo form or in complex with c-di-GMP have been published. Here, a novel set of structures of mouse STING-CTD (mSTING(137-344)) in apo and complex forms determined from crystals obtained under different crystallization conditions are reported. These novel closed-form structures exhibited considerable differences from previously reported open-form human STING-CTD structures. The novel mSTING structures feature extensive interactions between the two monomers, a unique asymmetric c-di-GMP molecule with one guanine base in an unusual syn conformation that is well accommodated in the dimeric interface with many direct specific interactions and two unexpected equivalent secondary peripheral c-di-GMP binding sites. Replacement of the amino acids crucial for specific c-di-GMP binding in mSTING significantly changes the ITC titration profiles and reduces the IFN-β reporter luciferase activity. Taken together, these results reveal a more stable c-di-GMP binding mode of STING proteins that could serve as a template for rational drug design to stimulate interferon production by mammalian cells.

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Organizational Affiliation: 

Agricultural Biotechnology Center, National Chung Hsing University, Taichung 40227, Taiwan.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Stimulator of interferon genes protein	A, B	207	Mus musculus	Mutation(s): 0  Gene Names: Tmem173, Eris Mita, Mpys, Sting, Sting1, Eris, Mita
Find proteins for Q3TBT3 (Mus musculus) Go to UniProtKB:  Q3TBT3
NIH Common Fund Data Resources
IMPC  MGI:1919762

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.251 
• R-Value Work: 0.194 
• R-Value Observed: 0.200 
• Space Group: P 3₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 78.493	α = 90
b = 78.493	β = 90
c = 50.409	γ = 120

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-04-24 
• Released Date: 2013-05-29 
Deposition Author(s): Chin, K.H., Su, Y.C., Tu, J.L., Chou, S.H.
• This entry supersedes: 4G3L

Revision History 

• Version 1.0: 2013-05-29
  Type: Initial release