6X5A

The mouse cGAS catalytic domain binding to human nucleosome that purified from HEK293T cells


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.36 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 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 

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

  • PubMed Abstract: 
  • Pathogen-derived nucleic acids induce potent innate immune responses 1-6 . Cyclic GMP-AMP synthase (cGAS) is a dsDNA sensor that catalyzes the synthesis of a cyclic dinucleotide cGAMP, which mediates the induction of type I interferons thr ...

    Pathogen-derived nucleic acids induce potent innate immune responses 1-6 . Cyclic GMP-AMP synthase (cGAS) is a dsDNA sensor that catalyzes the synthesis of a cyclic dinucleotide cGAMP, which mediates the induction of type I interferons through the STING-TBK1-IRF3 signaling axis 7-11 . It was widely accepted that cGAS is not reactive to self-DNA due to its cytosolic localization 2,12,13 . However, recent studies revealed that cGAS is mostly localized in the nucleus and tight nuclear tethering keeps cGAS inactive 14-18 . Here we show that cGAS binds to nucleosomes with nanomolar affinity and nucleosome binding potently inhibits the catalytic activity of cGAS. To elucidate the molecular basis of cGAS inactivation by nuclear tethering, we have determined the structure of mouse cGAS bound to human nucleosome by cryo-EM. The structure shows that cGAS binds to a negatively charged acidic patch formed by histone H2A and H2B via its second DNA binding site 19 . High affinity nucleosome binding blocks dsDNA binding and keeps cGAS in an inactive conformation. Mutations of cGAS that disrupt nucleosome binding dramatically affect cGAS mediated signaling in cells.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX, 77843, USA. pingwei@tamu.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3.2AE135Homo sapiensMutation(s): 0 
Gene Names: H3C15HIST2H3AH3C14H3F2H3FMHIST2H3CH3C13HIST2H3D
Find proteins for Q71DI3 (Homo sapiens)
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PHAROS  Q71DI3
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4BF102Homo sapiensMutation(s): 0 
Gene Names: 
Find proteins for P62805 (Homo sapiens)
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PHAROS  P62805
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2A type 1CG129Homo sapiensMutation(s): 0 
Gene Names: 
Find proteins for P0C0S8 (Homo sapiens)
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PHAROS  P0C0S8
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2B type 1-C/E/F/G/IDH124Homo sapiensMutation(s): 0 
Gene Names: 
Find proteins for P62807 (Homo sapiens)
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PHAROS  P62807
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthaseK372Mus musculusMutation(s): 0 
Gene Names: CgasMb21d1
EC: 2.7.7.86
Find proteins for Q8C6L5 (Mus musculus)
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsLengthOrganismImage
DNA (natural)I147Homo sapiens
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Entity ID: 6
MoleculeChainsLengthOrganismImage
DNA (natural)J147Homo sapiens
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
K
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.36 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 Of Allergy and Infectious Diseases (NIH/NIAID)United StatesGrant R01 AI145287

Revision History 

  • Version 1.0: 2020-09-16
    Type: Initial release
  • Version 1.1: 2020-09-23
    Changes: Database references