Structure of a STING-associated CdnE c-di-GMP synthase from Flavobacteriaceae sp.

Experimental Data Snapshot

  • Resolution: 1.52 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 

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This is version 1.2 of the entry. See complete history


STING cyclic dinucleotide sensing originated in bacteria.

Morehouse, B.R.Govande, A.A.Millman, A.Keszei, A.F.A.Lowey, B.Ofir, G.Shao, S.Sorek, R.Kranzusch, P.J.

(2020) Nature 586: 429-433

  • DOI: https://doi.org/10.1038/s41586-020-2719-5
  • Primary Citation of Related Structures:  
    6WT4, 6WT5, 6WT6, 6WT7, 6WT8, 6WT9

  • PubMed Abstract: 

    Stimulator of interferon genes (STING) is a receptor in human cells that senses foreign cyclic dinucleotides that are released during bacterial infection and in endogenous cyclic GMP-AMP signalling during viral infection and anti-tumour immunity 1-5 . STING shares no structural homology with other known signalling proteins 6-9 , which has limited attempts at functional analysis and prevented explanation of the origin of cyclic dinucleotide signalling in mammalian innate immunity. Here we reveal functional STING homologues encoded within prokaryotic defence islands, as well as a conserved mechanism of signal activation. Crystal structures of bacterial STING define a minimal homodimeric scaffold that selectively responds to cyclic di-GMP synthesized by a neighbouring cGAS/DncV-like nucleotidyltransferase (CD-NTase) enzyme. Bacterial STING domains couple the recognition of cyclic dinucleotides with the formation of protein filaments to drive oligomerization of TIR effector domains and rapid NAD + cleavage. We reconstruct the evolutionary events that followed the acquisition of STING into metazoan innate immunity, and determine the structure of a full-length TIR-STING fusion from the Pacific oyster Crassostrea gigas. Comparative structural analysis demonstrates how metazoan-specific additions to the core STING scaffold enabled a switch from direct effector function to regulation of antiviral transcription. Together, our results explain the mechanism of STING-dependent signalling and reveal the conservation of a functional cGAS-STING pathway in prokaryotic defence against bacteriophages.

  • Organizational Affiliation

    Department of Microbiology, Harvard Medical School, Boston, MA, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
STING-associated CdnE c-di-GMP synthase365FlavobacteriaceaeMutation(s): 0 
Find proteins for P0DUE2 (Flavobacteriaceae sp. genome_bin_11)
Explore P0DUE2 
Go to UniProtKB:  P0DUE2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DUE2
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
Experimental Data & Validation

Experimental Data

  • Resolution: 1.52 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.181α = 90
b = 78.1β = 90
c = 111.105γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-09
    Type: Initial release
  • Version 1.1: 2020-09-16
    Changes: Database references, Source and taxonomy, Structure summary
  • Version 1.2: 2020-10-28
    Changes: Database references