4LEZ

Structure of mouse cGAS bound to an 18bp DNA and cGAS product


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.36 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 

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This is version 1.4 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

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthaseA,
B [auth C]
366Mus musculusMutation(s): 0 
Gene Names: Mb21d1
EC: 2.7.7 (PDB Primary Data), 2.7.7.86 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q8C6L5 (Mus musculus)
Explore Q8C6L5 
Go to UniProtKB:  Q8C6L5
IMPC:  MGI:2442261
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8C6L5
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
18bp dsDNAC [auth E],
D [auth F],
E [auth I],
F [auth J]
18N/A
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.36 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.209α = 90
b = 99.031β = 90
c = 142.631γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


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
  • Version 1.2: 2015-08-05
    Changes: Non-polymer description
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations, Structure summary
  • Version 1.4: 2024-03-13
    Changes: Source and taxonomy, Structure summary