4KB6

Structure of porcine cyclic GMP AMP synthase (CGAS) in complex with DNA, ATP and GTP

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.08 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.255 

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This is version 1.4 of the entry. See complete history. 


Literature

Structural mechanism of cytosolic DNA sensing by cGAS.

Civril, F., Deimling, T., de Oliveira Mann, C.C., Ablasser, A., Moldt, M., Witte, G., Hornung, V., Hopfner, K.P.

(2013) Nature 498: 332-337

  • DOI: https://doi.org/10.1038/nature12305
  • Primary Citation of Related Structures:  
    4JLX, 4JLZ, 4KB6

  • PubMed Abstract: 

    Cytosolic DNA arising from intracellular bacterial or viral infections is a powerful pathogen-associated molecular pattern (PAMP) that leads to innate immune host defence by the production of type I interferon and inflammatory cytokines. Recognition of cytosolic DNA by the recently discovered cyclic-GMP-AMP (cGAMP) synthase (cGAS) induces the production of cGAMP to activate the stimulator of interferon genes (STING). Here we report the crystal structure of cGAS alone and in complex with DNA, ATP and GTP along with functional studies. Our results explain the broad DNA sensing specificity of cGAS, show how cGAS catalyses dinucleotide formation and indicate activation by a DNA-induced structural switch. cGAS possesses a remarkable structural similarity to the antiviral cytosolic double-stranded RNA sensor 2'-5'oligoadenylate synthase (OAS1), but contains a unique zinc thumb that recognizes B-form double-stranded DNA. Our results mechanistically unify dsRNA and dsDNA innate immune sensing by OAS1 and cGAS nucleotidyl transferases.

    • Organizational Affiliation: 

    Department of Biochemistry and Gene Center, Ludwig-Maximilians-University, 81377 Munich, Germany.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Uncharacterized protein366Sus scrofaMutation(s): 2 
Gene Names: MB21D1
UniProt
Find proteins for I3LM39 (Sus scrofa)
Explore I3LM39 
Go to UniProtKB:  I3LM39
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupI3LM39
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(P*CP*GP*AP*CP*GP*CP*TP*AP*GP*CP*GP*TP*CP*G)-3')
B, C
14synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.08 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.255 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.28α = 90
b = 111.89β = 90
c = 117.78γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
PHASERphasing
PHENIXrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-05
    Type: Initial release
  • Version 1.1: 2013-06-12
    Changes: Database references, Structure summary
  • Version 1.2: 2013-07-03
    Changes: Database references
  • Version 1.3: 2018-03-07
    Changes: Advisory, Data collection
  • Version 1.4: 2023-09-20
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description