6X59

The mouse cGAS catalytic domain binding to human assembled nucleosome


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.98 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

The molecular basis of tight nuclear tethering and inactivation of cGAS.

Zhao, B.Xu, P.Rowlett, C.M.Jing, T.Shinde, O.Lei, Y.West, A.P.Liu, W.R.Li, P.

(2020) Nature 587: 673-677

  • DOI: https://doi.org/10.1038/s41586-020-2749-z
  • Primary Citation of Related Structures:  
    6X59, 6X5A, 6XJD

  • PubMed Abstract: 

    Nucleic acids derived from pathogens induce potent innate immune responses 1-6 . Cyclic GMP-AMP synthase (cGAS) is a double-stranded DNA sensor that catalyses the synthesis of the cyclic dinucleotide cyclic GMP-AMP, which mediates the induction of type I interferons through the STING-TBK1-IRF3 signalling axis 7-11 . cGAS was previously thought to not react with self DNA owing to its cytosolic localization 2,12,13 ; however, recent studies have shown that cGAS is localized mostly in the nucleus and has low activity as a result of tight nuclear tethering 14-18 . Here we show that cGAS binds to nucleosomes with nanomolar affinity and that nucleosome binding potently inhibits its catalytic activity. To elucidate the molecular basis of cGAS inactivation by nuclear tethering, we determined the structure of mouse cGAS bound to human nucleosome by cryo-electron microscopy. The structure shows that cGAS binds to a negatively charged acidic patch formed by histones H2A and H2B via its second DNA-binding site 19 . High-affinity nucleosome binding blocks double-stranded DNA binding and maintains cGAS in an inactive conformation. Mutations of cGAS that disrupt nucleosome binding alter cGAS-mediated signalling in cells.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H3.2
A, E
135Homo sapiensMutation(s): 0 
Gene Names: H3C15HIST2H3AH3C14H3F2H3FMHIST2H3CH3C13HIST2H3D
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PHAROS:  Q71DI3
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UniProt GroupQ71DI3
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H4
B, F
102Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P62805 (Homo sapiens)
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PHAROS:  P62805
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2A type 1
C, G
129Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P0C0S8 (Homo sapiens)
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PHAROS:  P0C0S8
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2B type 1-C/E/F/G/I
D, H
125Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P62807 (Homo sapiens)
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PHAROS:  P62807
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthase372Mus musculusMutation(s): 0 
Gene Names: CgasMb21d1
EC: 2.7.7.86
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Find proteins for Q8C6L5 (Mus musculus)
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IMPC:  MGI:2442261
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UniProt GroupQ8C6L5
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Entity ID: 5
MoleculeChains LengthOrganismImage
DNA147Homo sapiens
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Entity ID: 6
MoleculeChains LengthOrganismImage
DNA147Homo sapiens
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Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.98 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Welch FoundationUnited StatesGrant A-1931-20170325
National Institutes of Health/National Institute on Aging (NIH/NIA)United StatesGrant R01 AI145287

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-16
    Type: Initial release
  • Version 1.1: 2020-09-23
    Changes: Database references
  • Version 1.2: 2020-12-09
    Changes: Database references
  • Version 1.3: 2022-03-16
    Changes: Author supporting evidence, Database references
  • Version 1.4: 2024-05-15
    Changes: Data collection