4KM5

X-ray crystal structure of human cyclic GMP-AMP synthase (cGAS)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.499 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.225 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of Human cGAS Reveals a Conserved Family of Second-Messenger Enzymes in Innate Immunity.

Kranzusch, P.J.Lee, A.S.Berger, J.M.Doudna, J.A.

(2013) Cell Rep 3: 1362-1368

  • DOI: 10.1016/j.celrep.2013.05.008

  • PubMed Abstract: 
  • Innate immune recognition of foreign nucleic acids induces protective interferon responses. Detection of cytosolic DNA triggers downstream immune signaling through activation of cyclic GMP-AMP synthase (cGAS). We report here the crystal structure of ...

    Innate immune recognition of foreign nucleic acids induces protective interferon responses. Detection of cytosolic DNA triggers downstream immune signaling through activation of cyclic GMP-AMP synthase (cGAS). We report here the crystal structure of human cGAS, revealing an unanticipated zinc-ribbon DNA-binding domain appended to a core enzymatic nucleotidyltransferase scaffold. The catalytic core of cGAS is structurally homologous to the RNA-sensing enzyme, 2'-5' oligo-adenylate synthase (OAS), and divergent C-terminal domains account for specific ligand-activation requirements of each enzyme. We show that the cGAS zinc ribbon is essential for STING-dependent induction of the interferon response and that conserved amino acids displayed within the intervening loops are required for efficient cytosolic DNA recognition. These results demonstrate that cGAS and OAS define a family of innate immunity sensors and that structural divergence from a core nucleotidyltransferase enables second-messenger responses to distinct foreign nucleic acids.


    Organizational Affiliation

    Department of Molecular & Cell Biology, Center for RNA Systems Biology, Howard Hughes Medical Institute, University of California, Berkeley, CA 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyclic GMP-AMP synthase
A
369Homo sapiensGene Names: MB21D1 (C6orf150)
EC: 2.7.7.86
Find proteins for Q8N884 (Homo sapiens)
Go to Gene View: MB21D1
Go to UniProtKB:  Q8N884
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.499 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.225 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 46.454α = 90.00
b = 162.700β = 90.00
c = 58.407γ = 90.00
Software Package:
Software NamePurpose
Web-Icedata collection
PHENIXphasing
PHENIXmodel building
PHENIXrefinement
SCALAdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-29
    Type: Initial release
  • Version 1.1: 2013-06-12
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Refinement description