6O8B

Crystal structure of STING CTD in complex with TBK1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A conserved PLPLRT/SD motif of STING mediates the recruitment and activation of TBK1.

Zhao, B.Du, F.Xu, P.Shu, C.Sankaran, B.Bell, S.L.Liu, M.Lei, Y.Gao, X.Fu, X.Zhu, F.Liu, Y.Laganowsky, A.Zheng, X.Ji, J.Y.West, A.P.Watson, R.O.Li, P.

(2019) Nature 569: 718-722

  • DOI: 10.1038/s41586-019-1228-x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Nucleic acids from bacteria or viruses induce potent immune responses in infected cells <sup>1-4 </sup>. The detection of pathogen-derived nucleic acids is a central strategy by which the host senses infection and initiates protective immune response ...

    Nucleic acids from bacteria or viruses induce potent immune responses in infected cells 1-4 . The detection of pathogen-derived nucleic acids is a central strategy by which the host senses infection and initiates protective immune responses 5,6 . Cyclic GMP-AMP synthase (cGAS) is a double-stranded DNA sensor 7,8 . It catalyses the synthesis of cyclic GMP-AMP (cGAMP) 9-12 , which stimulates the induction of type I interferons through the STING-TBK1-IRF-3 signalling axis 13-15 . STING oligomerizes after binding of cGAMP, leading to the recruitment and activation of the TBK1 kinase 8,16 . The IRF-3 transcription factor is then recruited to the signalling complex and activated by TBK1 8,17-20 . Phosphorylated IRF-3 translocates to the nucleus and initiates the expression of type I interferons 21 . However, the precise mechanisms that govern activation of STING by cGAMP and subsequent activation of TBK1 by STING remain unclear. Here we show that a conserved PLPLRT/SD motif within the C-terminal tail of STING mediates the recruitment and activation of TBK1. Crystal structures of TBK1 bound to STING reveal that the PLPLRT/SD motif binds to the dimer interface of TBK1. Cell-based studies confirm that the direct interaction between TBK1 and STING is essential for induction of IFN╬▓ after cGAMP stimulation. Moreover, we show that full-length STING oligomerizes after it binds cGAMP, and highlight this as an essential step in the activation of STING-mediated signalling. These findings provide a structural basis for the development of STING agonists and antagonists for the treatment of cancer and autoimmune disorders.


    Organizational Affiliation

    Department of Biological Science, Florida State University, Tallahassee, FL, USA.,Department of Chemistry, Texas A&M University, College Station, TX, USA.,Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, College Station, TX, USA.,Department of Molecular and Cellular Medicine, College of Medicine, Texas A&M University Health Science Center, College Station, TX, USA.,Molecular Biophysics and Integrated Bioimaging, Berkeley Center for Structural Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.,Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX, USA.,Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX, USA. pingwei@tamu.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stimulator of interferon genes protein
D, E
226Homo sapiensMutation(s): 3 
Gene Names: TMEM173 (ERIS, MITA, STING)
Find proteins for Q86WV6 (Homo sapiens)
Go to Gene View: TMEM173
Go to UniProtKB:  Q86WV6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase TBK1
A, B
665Homo sapiensMutation(s): 2 
Gene Names: TBK1 (NAK)
EC: 2.7.11.1
Find proteins for Q9UHD2 (Homo sapiens)
Go to Gene View: TBK1
Go to UniProtKB:  Q9UHD2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BX7
Query on BX7

Download SDF File 
Download CCD File 
A, B
N-(3-{[5-iodo-4-({3-[(thiophen-2-ylcarbonyl)amino]propyl}amino)pyrimidin-2-yl]amino}phenyl)pyrrolidine-1-carboxamide
C23 H26 I N7 O2 S
VAVXGGRQQJZYBL-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.243 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 250.690α = 90.00
b = 250.690β = 90.00
c = 239.241γ = 120.00
Software Package:
Software NamePurpose
PHENIXphasing
iMOSFLMdata reduction
PHENIXrefinement
pointlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2019-03-09 
  • Released Date: 2019-05-22 
  • Deposition Author(s): Li, P., Zhao, B., Du, F.

Funding OrganizationLocationGrant Number
Welch FoundationUnited StatesA-1931-20170325

Revision History 

  • Version 1.0: 2019-05-22
    Type: Initial release
  • Version 1.1: 2019-06-05
    Type: Data collection, Database references
  • Version 1.2: 2019-06-12
    Type: Data collection, Database references