6CTA

Structure of the human cGAS-DNA complex with ATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.78 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.214 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structure of the Human cGAS-DNA Complex Reveals Enhanced Control of Immune Surveillance.

Zhou, W.Whiteley, A.T.de Oliveira Mann, C.C.Morehouse, B.R.Nowak, R.P.Fischer, E.S.Gray, N.S.Mekalanos, J.J.Kranzusch, P.J.

(2018) Cell 174: 300-311.e11

  • DOI: 10.1016/j.cell.2018.06.026
  • Primary Citation of Related Structures:  
    6CT9, 6CTA

  • PubMed Abstract: 
  • Cyclic GMP-AMP synthase (cGAS) recognition of cytosolic DNA is critical for immune responses to pathogen replication, cellular stress, and cancer. Existing structures of the mouse cGAS-DNA complex provide a model for enzyme activation but do not explain why human cGAS exhibits severely reduced levels of cyclic GMP-AMP (cGAMP) synthesis compared to other mammals ...

    Cyclic GMP-AMP synthase (cGAS) recognition of cytosolic DNA is critical for immune responses to pathogen replication, cellular stress, and cancer. Existing structures of the mouse cGAS-DNA complex provide a model for enzyme activation but do not explain why human cGAS exhibits severely reduced levels of cyclic GMP-AMP (cGAMP) synthesis compared to other mammals. Here, we discover that enhanced DNA-length specificity restrains human cGAS activation. Using reconstitution of cGAMP signaling in bacteria, we mapped the determinant of human cGAS regulation to two amino acid substitutions in the DNA-binding surface. Human-specific substitutions are necessary and sufficient to direct preferential detection of long DNA. Crystal structures reveal why removal of human substitutions relaxes DNA-length specificity and explain how human-specific DNA interactions favor cGAS oligomerization. These results define how DNA-sensing in humans adapted for enhanced specificity and provide a model of the active human cGAS-DNA complex to enable structure-guided design of cGAS therapeutics.


    Organizational Affiliation

    Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA; Department of Cancer Immunology and Virology, Dana-Farber Cancer Institute, Boston, MA 02115, USA. Electronic address: philip_kranzusch@dfci.harvard.edu.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthaseA367Homo sapiensMutation(s): 2 
Gene Names: CGASC6orf150MB21D1
EC: 2.7.7.86
UniProt & NIH Common Fund Data Resources
Find proteins for Q8N884 (Homo sapiens)
Explore Q8N884 
Go to UniProtKB:  Q8N884
PHAROS:  Q8N884
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(P*CP*GP*TP*CP*TP*TP*CP*GP*GP*CP*AP*AP*T)-3')B17synthetic construct
    Protein Feature View
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    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*AP*AP*AP*TP*TP*GP*CP*CP*GP*AP*AP*GP*AP*CP*GP*A)-3')C17synthetic construct
      Protein Feature View
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      • Reference Sequence
      Small Molecules
      Ligands 3 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      ATP (Subject of Investigation/LOI)
      Query on ATP

      Download Ideal Coordinates CCD File 
      G [auth A]ADENOSINE-5'-TRIPHOSPHATE
      C10 H16 N5 O13 P3
      ZKHQWZAMYRWXGA-KQYNXXCUSA-N
       Ligand Interaction
      ZN
      Query on ZN

      Download Ideal Coordinates CCD File 
      D [auth A]ZINC ION
      Zn
      PTFCDOFLOPIGGS-UHFFFAOYSA-N
       Ligand Interaction
      MG
      Query on MG

      Download Ideal Coordinates CCD File 
      E [auth A], F [auth A]MAGNESIUM ION
      Mg
      JLVVSXFLKOJNIY-UHFFFAOYSA-N
       Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.78 Å
      • R-Value Free: 0.245 
      • R-Value Work: 0.211 
      • R-Value Observed: 0.214 
      • Space Group: P 61 2 2
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 99.782α = 90
      b = 99.782β = 90
      c = 236.769γ = 120
      Software Package:
      Software NamePurpose
      PHENIXrefinement
      XDSdata reduction
      Aimlessdata scaling
      PHASERphasing

      Structure Validation

      View Full Validation Report



      Ligand Structure Quality Assessment  



      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2018-07-18
        Type: Initial release
      • Version 1.1: 2018-08-01
        Changes: Data collection, Database references
      • Version 1.2: 2019-04-17
        Changes: Author supporting evidence, Data collection