6EA8

Structure of VACV poxin in pre-reactive state with nonhydrolyzable 2'3' cGAMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 

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This is version 1.3 of the entry. See complete history


Literature

Viral and metazoan poxins are cGAMP-specific nucleases that restrict cGAS-STING signalling.

Eaglesham, J.B.Pan, Y.Kupper, T.S.Kranzusch, P.J.

(2019) Nature 566: 259-263

  • DOI: 10.1038/s41586-019-0928-6
  • Primary Citation of Related Structures:  
    6EA6, 6EA8, 6EA9

  • PubMed Abstract: 
  • Cytosolic DNA triggers innate immune responses through the activation of cyclic GMP-AMP synthase (cGAS) and production of the cyclic dinucleotide second messenger 2',3'-cyclic GMP-AMP (cGAMP) 1-4 . 2',3'-cGAMP is a potent inducer of immune signalling; however, no intracellular nucleases are known to cleave 2',3'-cGAMP and prevent the activation of the receptor stimulator of interferon genes (STING) 5-7 ...

    Cytosolic DNA triggers innate immune responses through the activation of cyclic GMP-AMP synthase (cGAS) and production of the cyclic dinucleotide second messenger 2',3'-cyclic GMP-AMP (cGAMP) 1-4 . 2',3'-cGAMP is a potent inducer of immune signalling; however, no intracellular nucleases are known to cleave 2',3'-cGAMP and prevent the activation of the receptor stimulator of interferon genes (STING) 5-7 . Here we develop a biochemical screen to analyse 24 mammalian viruses, and identify poxvirus immune nucleases (poxins) as a family of 2',3'-cGAMP-degrading enzymes. Poxins cleave 2',3'-cGAMP to restrict STING-dependent signalling and deletion of the poxin gene (B2R) attenuates vaccinia virus replication in vivo. Crystal structures of vaccinia virus poxin in pre- and post-reactive states define the mechanism of selective 2',3'-cGAMP degradation through metal-independent cleavage of the 3'-5' bond, converting 2',3'-cGAMP into linear Gp[2'-5']Ap[3']. Poxins are conserved in mammalian poxviruses. In addition, we identify functional poxin homologues in the genomes of moths and butterflies and the baculoviruses that infect these insects. Baculovirus and insect host poxin homologues retain selective 2',3'-cGAMP degradation activity, suggesting an ancient role for poxins in cGAS-STING regulation. Our results define poxins as a family of 2',3'-cGAMP-specific nucleases and demonstrate a mechanism for how viruses evade innate immunity.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein B2
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J
220Vaccinia virus WRMutation(s): 0 
Gene Names: VACWR184B2R
EC: 3.1
UniProt
Find proteins for Q01225 (Vaccinia virus (strain Western Reserve))
Explore Q01225 
Go to UniProtKB:  Q01225
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
J2B (Subject of Investigation/LOI)
Query on J2B

Download Ideal Coordinates CCD File 
M [auth H]O-[(1R,2R,3R)-5-{[(S)-{[(2R,3R,4R,5R)-2-(2-amino-6-oxo-3,6-dihydro-9H-purin-9-yl)-4-hydroxy-5-(hydroxymethyl)tetrahydro furan-3-yl]oxy}(sulfanyl)phosphoryl]oxy}-1-(6-amino-9H-purin-9-yl)-1,2-dihydroxypentan-3-yl] dihydrogen (R)-phosphorothioate
C20 H28 N10 O12 P2 S2
WDMUGQSSXDUMIY-MHPWAGLLSA-N
 Ligand Interaction
J2A (Subject of Investigation/LOI)
Query on J2A

Download Ideal Coordinates CCD File 
K [auth A], L [auth F](2S,5R,7R,8R,10R,12aR,14R,15R,15aS,16R)-7-(2-amino-6-oxo-3,6-dihydro-9H-purin-9-yl)-14-(6-amino-9H-purin-9-yl)-15,16-dihydroxy-2,10-disulfanyloctahydro-2H,10H,12H-5,8-methano-2lambda~5~,10lambda~5~-furo[3,2-l][1,3,6,9,11,2,10]pentaoxadiphosphacyclotetradecine-2,10-dione
C20 H24 N10 O11 P2 S2
NVOTUSOAWRDABP-JRZJYRHUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.428α = 90
b = 92.33β = 93.66
c = 257.088γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-06
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Data collection, Database references
  • Version 1.2: 2019-02-27
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-11
    Changes: Derived calculations