4LEW

Structure of human cGAS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 

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: https://doi.org/10.1016/j.immuni.2013.10.019
  • Primary Citation of Related Structures:  
    4LEV, 4LEW, 4LEY, 4LEZ

  • 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. 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthaseA [auth B],
B [auth A]
366Homo sapiensMutation(s): 0 
Gene Names: MB21D1C6orf150
EC: 2.7.7 (PDB Primary Data), 2.7.7.86 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q8N884 (Homo sapiens)
Explore Q8N884 
Go to UniProtKB:  Q8N884
PHAROS:  Q8N884
GTEx:  ENSG00000164430 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8N884
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A [auth B],
B [auth A]
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.815α = 90
b = 111.48β = 92.73
c = 76.414γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
SOLVEphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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