4LEV

Structure of human cGAS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.952 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Cyclic GMP-AMP Synthase Is Activated by Double-Stranded DNA-Induced Oligomerization.

Li, X.Shu, C.Yi, G.Chaton, C.T.Shelton, C.L.Diao, J.Zuo, X.Kao, C.C.Herr, A.B.Li, P.

(2013) Immunity 39: 1019-1031

  • DOI: 10.1016/j.immuni.2013.10.019
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cyclic GMP-AMP synthase (cGAS) is a cytosolic DNA sensor mediating innate antimicrobial immunity. It catalyzes the synthesis of a noncanonical cyclic dinucleotide, 2',5' cGAMP, that binds to STING and mediates the activation of TBK1 and IRF-3. Activa ...

    Cyclic GMP-AMP synthase (cGAS) is a cytosolic DNA sensor mediating innate antimicrobial immunity. It catalyzes the synthesis of a noncanonical cyclic dinucleotide, 2',5' cGAMP, that binds to STING and mediates the activation of TBK1 and IRF-3. Activated IRF-3 translocates to the nucleus and initiates the transcription of the IFN-β gene. The structure of mouse cGAS bound to an 18 bp dsDNA revealed that cGAS interacts with dsDNA through two binding sites, forming a 2:2 complex. Enzyme assays and IFN-β reporter assays of cGAS mutants demonstrated that interactions at both DNA binding sites are essential for cGAS activation. Mutagenesis and DNA binding studies showed that the two sites bind dsDNA cooperatively and that site B plays a critical role in DNA binding. The structure of mouse cGAS bound to dsDNA and 2',5' cGAMP provided insight into the catalytic mechanism of cGAS. These results demonstrated that cGAS is activated by dsDNA-induced oligomerization.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-2128, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyclic GMP-AMP synthase
A, B
369Homo 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, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.952 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.167 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 212.981α = 90.00
b = 47.715β = 113.89
c = 86.869γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
ADSCdata collection
HKL-2000data scaling
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-06-26 
  • Released Date: 2013-12-25 
  • Deposition Author(s): Li, P.

Revision History 

  • Version 1.0: 2013-12-25
    Type: Initial release
  • Version 1.1: 2014-01-08
    Type: Database references