6CTA | pdb_00006cta

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 (Depositor), 0.250 (DCC) 
  • R-Value Work: 
    0.211 (Depositor), 0.210 (DCC) 
  • R-Value Observed: 
    0.214 (Depositor) 

Starting Model: experimental
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Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted ATPClick on this verticalbar to view details

This is version 1.3 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: https://doi.org/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. 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.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthase367Homo 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
GTEx:  ENSG00000164430 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8N884
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.78 Å
  • R-Value Free:  0.245 (Depositor), 0.250 (DCC) 
  • R-Value Work:  0.211 (Depositor), 0.210 (DCC) 
  • R-Value Observed: 0.214 (Depositor) 
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 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted ATPClick on this verticalbar to view details

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
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description