4MKP

Crystal structure of human cGAS apo form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.953 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural and Functional Analyses of DNA-Sensing and Immune Activation by Human cGAS

Kato, K.Ishii, R.Goto, E.Ishitani, R.Tokunaga, F.Nureki, O.

(2013) Plos One 8: e76983-e76983

  • DOI: 10.1371/journal.pone.0076983

  • PubMed Abstract: 
  • The detection of cytosolic DNA, derived from pathogens or host cells, by cytosolic receptors is essential for appropriate host immune responses. Cyclic GMP-AMP synthase (cGAS) is a newly identified cytosolic DNA receptor that produces cyclic GMP-AMP, ...

    The detection of cytosolic DNA, derived from pathogens or host cells, by cytosolic receptors is essential for appropriate host immune responses. Cyclic GMP-AMP synthase (cGAS) is a newly identified cytosolic DNA receptor that produces cyclic GMP-AMP, which activates stimulator of interferon genes (STING), resulting in TBK1-IRF3 pathway activation followed by the production of type I interferons. Here we report the crystal structure of human cGAS. The structure revealed that a cluster of lysine and arginine residues forms the positively charged DNA binding surface of human cGAS, which is important for the STING-dependent immune activation. A structural comparison with other previously determined cGASs and our functional analyses suggested that a conserved zinc finger motif and a leucine residue on the DNA binding surface are crucial for the DNA-specific immune response of human cGAS, consistent with previous work. These structural features properly orient the DNA binding to cGAS, which is critical for DNA-induced cGAS activation and STING-dependent immune activation. Furthermore, we showed that the cGAS-induced activation of STING also involves the activation of the NF-κB and IRF3 pathways. Our results indicated that cGAS is a DNA sensor that efficiently activates the host immune system by inducing two distinct pathways.


    Organizational Affiliation

    Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan ; Global Research Cluster, RIKEN, Wako, Saitama, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyclic GMP-AMP synthase
A
364Homo sapiensMutation(s): 0 
Gene Names: CGAS (C6orf150, MB21D1)
EC: 2.7.7.86
Find proteins for Q8N884 (Homo sapiens)
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: 1.953 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.204 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 123.546α = 90.00
b = 48.311β = 90.00
c = 59.565γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
MOLREPphasing
HKL-2000data reduction
PDB_EXTRACTdata extraction
PHENIXrefinement
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-30
    Type: Initial release