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 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 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:  
    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 ...

    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. Electronic address: pingwei@tamu.edu.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthaseA, B [auth C]366Mus musculusMutation(s): 0 
Gene Names: Mb21d1Cgas
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
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    18bp dsDNAC [auth E], D [auth F], E [auth I], F [auth J]18N/A
    Protein Feature View
    Expand
    • Reference Sequence
    Small Molecules
    Ligands 2 Unique
    IDChainsName / Formula / InChI Key2D Diagram3D Interactions
    1SY (Subject of Investigation/LOI)
    Query on 1SY

    Download Ideal Coordinates CCD File 
    H [auth A], J [auth C]cGAMP
    C20 H24 N10 O13 P2
    XRILCFTWUCUKJR-INFSMZHSSA-N
     Ligand Interaction
    ZN
    Query on ZN

    Download Ideal Coordinates CCD File 
    G [auth A], I [auth C]ZINC ION
    Zn
    PTFCDOFLOPIGGS-UHFFFAOYSA-N
     Ligand Interaction
    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

    View Full Validation Report



    Ligand Structure Quality Assessment  



    Entry History 

    Deposition Data

    • Deposited Date: 2013-06-26 
    • 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