7LT2

Structure of a dsRNA-sensing cGAS-like receptor from the beetle Tribolium castaneum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

cGAS-like receptors sense RNA and control 3'2'-cGAMP signalling in Drosophila.

Slavik, K.M.Morehouse, B.R.Ragucci, A.E.Zhou, W.Ai, X.Chen, Y.Li, L.Wei, Z.Bahre, H.Konig, M.Seifert, R.Lee, A.S.Y.Cai, H.Imler, J.L.Kranzusch, P.J.

(2021) Nature 597: 109-113

  • DOI: 10.1038/s41586-021-03743-5
  • Primary Citation of Related Structures:  
    7LT1, 7LT2, 7MWY, 7MWZ

  • PubMed Abstract: 
  • Cyclic GMP-AMP synthase (cGAS) is a cytosolic DNA sensor that produces the second messenger 2'3'-cGAMP and controls activation of innate immunity in mammalian cells 1-5 . Animal genomes typically encode multiple proteins with predicted homology to cGAS 6-10 , but the function of these uncharacterized enzymes is unknown ...

    Cyclic GMP-AMP synthase (cGAS) is a cytosolic DNA sensor that produces the second messenger 2'3'-cGAMP and controls activation of innate immunity in mammalian cells 1-5 . Animal genomes typically encode multiple proteins with predicted homology to cGAS 6-10 , but the function of these uncharacterized enzymes is unknown. Here we show that cGAS-like receptors (cGLRs) are innate immune sensors capable of recognizing divergent molecular patterns and catalyzing synthesis of distinct nucleotide second messenger signals. Crystal structures of human and insect cGLRs reveal a nucleotidyltransferase signaling core shared with cGAS and a diversified primary ligand-binding surface modified with significant insertions and deletions. We demonstrate that cGLR surface remodeling enables altered ligand specificity and use a forward biochemical screen to identify cGLR1 as a double-stranded RNA sensor in the model organism Drosophila melanogaster. Surprisingly, RNA recognition activates Drosophila cGLR1 to synthesize the novel product cG[3'-5']pA[2'-5']p (3'2'-cGAMP). A crystal structure of Drosophila Stimulator of Interferon Genes (STING) in complex with 3'2'-cGAMP explains selective isomer recognition and we demonstrate that 3'2'-cGAMP induces an enhanced antiviral state in vivo that protects from viral infection. Similar to radiation of Toll-like receptors in pathogen immunity, our results establish cGLRs as a diverse family of metazoan pattern recognition receptors.


    Organizational Affiliation

    Parker Institute for Cancer Immunotherapy at Dana-Farber Cancer Institute, Boston, MA, 02115, USA. philip_kranzusch@dfci.harvard.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mab-21 domain-containing proteinA399Tribolium castaneumMutation(s): 0 
Gene Names: TcasGA2_TC003965
UniProt
Find proteins for D6WI29 (Tribolium castaneum)
Explore D6WI29 
Go to UniProtKB:  D6WI29
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download Ideal Coordinates CCD File 
B [auth A]MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.405α = 90
b = 70.443β = 90
c = 104.604γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-07-21
    Type: Initial release
  • Version 1.1: 2021-09-15
    Changes: Database references