7JOA

2:1 cGAS-nucleosome complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis of nucleosome-dependent cGAS inhibition.

Boyer, J.A.Spangler, C.J.Strauss, J.D.Cesmat, A.P.Liu, P.McGinty, R.K.Zhang, Q.

(2020) Science 370: 450-454

  • DOI: https://doi.org/10.1126/science.abd0609
  • Primary Citation of Related Structures:  
    7JO9, 7JOA

  • PubMed Abstract: 

    Cyclic guanosine monophosphate (GMP)-adenosine monophosphate (AMP) synthase (cGAS) recognizes cytosolic foreign or damaged DNA to activate the innate immune response to infection, inflammatory diseases, and cancer. By contrast, cGAS reactivity against self-DNA in the nucleus is suppressed by chromatin tethering. We report a 3.3-angstrom-resolution cryo-electron microscopy structure of cGAS in complex with the nucleosome core particle. The structure reveals that cGAS uses two conserved arginines to anchor to the nucleosome acidic patch. The nucleosome-binding interface exclusively occupies the strong double-stranded DNA (dsDNA)-binding surface on cGAS and sterically prevents cGAS from oligomerizing into the functionally active 2:2 cGAS-dsDNA state. These findings provide a structural basis for how cGAS maintains an inhibited state in the nucleus and further exemplify the role of the nucleosome in regulating diverse nuclear protein functions.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H3.2
A, E
136Homo sapiensMutation(s): 0 
Gene Names: H3C15HIST2H3AH3C14H3F2H3FMHIST2H3CH3C13HIST2H3D
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Find proteins for Q71DI3 (Homo sapiens)
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Go to UniProtKB:  Q71DI3
PHAROS:  Q71DI3
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UniProt GroupQ71DI3
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H4
B, F
103Homo sapiensMutation(s): 0 
Gene Names: 
UniProt & NIH Common Fund Data Resources
Find proteins for P62805 (Homo sapiens)
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Go to UniProtKB:  P62805
PHAROS:  P62805
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UniProt GroupP62805
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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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UniProt GroupP0C0S8
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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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UniProt GroupP62807
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthase366Mus 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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Go to UniProtKB:  Q8C6L5
IMPC:  MGI:2442261
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UniProt GroupQ8C6L5
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Entity ID: 5
MoleculeChains LengthOrganismImage
DNA (145-MER)147synthetic construct
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Entity ID: 6
MoleculeChains LengthOrganismImage
DNA (145-MER)147synthetic construct
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
L [auth K]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.18
RECONSTRUCTIONRELION3.1-beta

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1R35GM133498
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR21CA234979

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: 2020-11-04
    Changes: Database references
  • Version 1.3: 2024-03-06
    Changes: Data collection, Database references, Refinement description