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- EMDB-22046: The mouse cGAS catalytic domain binding to human assembled nucleosome -

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Basic information

Entry
Database: EMDB / ID: EMD-22046
TitleThe mouse cGAS catalytic domain binding to human assembled nucleosome
Map data
SamplecGAS-nucleosome complex:
Histone H3.2 / Histone H4 / Histone H2A type 1 / Histone H2B type 1-C/E/F/G/I / (nucleic-acidNucleic acid) x 2 / Cyclic GMP-AMP synthase / ligand
Function / homology
Function and homology information


cyclic GMP-AMP synthase / positive regulation of cGMP-mediated signaling / cyclic-GMP-AMP synthase activity / regulation of immunoglobulin production / paracrine signaling / regulation of type I interferon production / negative regulation of double-strand break repair via homologous recombination / regulation of T cell activation / positive regulation of cAMP-mediated signaling / cellular response to exogenous dsRNA ...cyclic GMP-AMP synthase / positive regulation of cGMP-mediated signaling / cyclic-GMP-AMP synthase activity / regulation of immunoglobulin production / paracrine signaling / regulation of type I interferon production / negative regulation of double-strand break repair via homologous recombination / regulation of T cell activation / positive regulation of cAMP-mediated signaling / cellular response to exogenous dsRNA / negative regulation of megakaryocyte differentiation / positive regulation of defense response to virus by host / CENP-A containing nucleosome assembly / activation of innate immune response / DNA replication-independent nucleosome assembly / telomere capping / interleukin-7-mediated signaling pathway / chromatin silencing / determination of adult lifespan / positive regulation of type I interferon production / telomere organization / DNA replication-dependent nucleosome assembly / innate immune response in mucosa / nuclear nucleosome / rDNA heterochromatin assembly / negative regulation of gene expression, epigenetic / regulation of gene silencing by miRNA / nuclear chromosome / DNA-templated transcription, initiation / regulation of megakaryocyte differentiation / phosphatidylinositol-4,5-bisphosphate binding / nucleosome assembly / nucleosome / site of double-strand break / positive regulation of cellular senescence / double-strand break repair via nonhomologous end joining / defense response to virus / double-stranded DNA binding / chromatin organization / regulation of immune response / nuclear chromosome, telomeric region / antibacterial humoral response / antimicrobial humoral immune response mediated by antimicrobial peptide / blood coagulation / protein ubiquitination / protein heterodimerization activity / defense response to Gram-positive bacterium / nuclear chromatin / DNA repair / protein domain specific binding / GTP binding / cellular response to DNA damage stimulus / chromatin binding / cellular protein metabolic process / innate immune response / host cell nucleus / enzyme binding / protein-containing complex / RNA binding / DNA binding / extracellular space / extracellular exosome / membrane / extracellular region / nucleoplasm / ATP binding / identical protein binding / plasma membrane / metal ion binding / nucleus / cytosol
Histone H2B / TATA box binding protein associated factor (TAF) / CENP-T/Histone H4, histone fold / Histone H2A conserved site / Histone H2A, C-terminal domain / Mab-21 domain / Histone H4, conserved site / Histone H3/CENP-A / Histone-fold / Histone H4 ...Histone H2B / TATA box binding protein associated factor (TAF) / CENP-T/Histone H4, histone fold / Histone H2A conserved site / Histone H2A, C-terminal domain / Mab-21 domain / Histone H4, conserved site / Histone H3/CENP-A / Histone-fold / Histone H4 / Histone H2A / Histone H2A/H2B/H3
Histone H2A type 1 / Histone H4 / Histone H2B type 1-C/E/F/G/I / Histone H3.2 / Cyclic GMP-AMP synthase
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.98 Å
AuthorsPengbiao X / Pingwei L / Baoyu Z
Funding support United States, 2 items
OrganizationGrant numberCountry
Welch FoundationGrant A-1931-20170325 United States
NIaGrant R01 AI145287 United States
CitationJournal: Nature / Year: 2020
Title: The Molecular Basis of Tight Nuclear Tethering and Inactivation of cGAS.
Authors: Baoyu Zhao / Pengbiao Xu / Chesley M Rowlett / Tao Jing / Omkar Shinde / Yuanjiu Lei / A Phillip West / Wenshe Ray Liu / Pingwei Li /
Abstract: Pathogen-derived nucleic acids induce potent innate immune responses. Cyclic GMP-AMP synthase (cGAS) is a dsDNA sensor that catalyzes the synthesis of a cyclic dinucleotide cGAMP, which mediates the ...Pathogen-derived nucleic acids induce potent innate immune responses. 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. It was widely accepted that cGAS is not reactive to self-DNA due to its cytosolic localization. However, recent studies revealed that cGAS is mostly localized in the nucleus and tight nuclear tethering keeps cGAS inactive. 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. 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.
Validation ReportPDB-ID: 6x59

SummaryFull reportAbout validation report
History
DepositionMay 25, 2020-
Header (metadata) releaseSep 16, 2020-
Map releaseSep 16, 2020-
UpdateSep 23, 2020-
Current statusSep 23, 2020Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0116
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.0116
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6x59
  • Surface level: 0.0116
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_22046.map.gz / Format: CCP4 / Size: 38.4 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 216 pix.
= 231.12 Å
1.07 Å/pix.
x 216 pix.
= 231.12 Å
1.07 Å/pix.
x 216 pix.
= 231.12 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07 Å
Density
Contour LevelBy AUTHOR: 0.0116 / Movie #1: 0.0116
Minimum - Maximum-0.050537992 - 0.11500387
Average (Standard dev.)0.00029002168 (±0.0036377509)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions216216216
Spacing216216216
CellA=B=C: 231.12001 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.071.071.07
M x/y/z216216216
origin x/y/z0.0000.0000.000
length x/y/z231.120231.120231.120
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS216216216
D min/max/mean-0.0510.1150.000

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Supplemental data

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Sample components

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Entire cGAS-nucleosome complex

EntireName: cGAS-nucleosome complex
Details: The mouse cGAS catalytic domain binding to assembled human nucleosome
Number of components: 9

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Component #1: protein, cGAS-nucleosome complex

ProteinName: cGAS-nucleosome complex
Details: The mouse cGAS catalytic domain binding to assembled human nucleosome
Recombinant expression: No
SourceSpecies: Homo sapiens (human)

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Component #2: protein, Histone H3.2

ProteinName: Histone H3.2 / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 15.257838 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli BL21(DE3) (bacteria)

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Component #3: protein, Histone H4

ProteinName: Histone H4 / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 11.263231 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli BL21(DE3) (bacteria)

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Component #4: protein, Histone H2A type 1

ProteinName: Histone H2A type 1 / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 13.990342 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli BL21(DE3) (bacteria)

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Component #5: protein, Histone H2B type 1-C/E/F/G/I

ProteinName: Histone H2B type 1-C/E/F/G/I / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 13.79598 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli BL21(DE3) (bacteria)

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Component #6: nucleic-acid, DNA

nucleic acidName: DNA / Class: DNA / Structure: OTHER / Synthetic: No
Sequence: (DC)(DT)(DG)(DG)(DA)(DG)(DA)(DA)(DT)(DC) (DC)(DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG)(DA) (DG)(DG)(DC)(DC)(DG)(DC)(DT)(DC)(DA)(DA) (DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT)(DA)(DG) (DA)(DC)(DA)(DG)(DC)(DT) ...Sequence:
(DC)(DT)(DG)(DG)(DA)(DG)(DA)(DA)(DT)(DC) (DC)(DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG)(DA) (DG)(DG)(DC)(DC)(DG)(DC)(DT)(DC)(DA)(DA) (DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT)(DA)(DG) (DA)(DC)(DA)(DG)(DC)(DT)(DC)(DT)(DA)(DG) (DC)(DA)(DC)(DC)(DG)(DC)(DT)(DT)(DA)(DA) (DA)(DC)(DG)(DC)(DA)(DC)(DG)(DT)(DA)(DC) (DG)(DC)(DG)(DC)(DT)(DG)(DT)(DC)(DC)(DC) (DC)(DC)(DG)(DC)(DG)(DT)(DT)(DT)(DT)(DA) (DA)(DC)(DC)(DG)(DC)(DC)(DA)(DA)(DG)(DG) (DG)(DG)(DA)(DT)(DT)(DA)(DC)(DT)(DC)(DC) (DC)(DT)(DA)(DG)(DT)(DC)(DT)(DC)(DC)(DA) (DG)(DG)(DC)(DA)(DC)(DG)(DT)(DG)(DT)(DC) (DA)(DG)(DA)(DT)(DA)(DT)(DA)(DT)(DA)(DC) (DA)(DT)(DC)(DC)(DT)(DG)(DT)
MassTheoretical: 45.145754 kDa
SourceSpecies: Homo sapiens (human)

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Component #7: nucleic-acid, DNA

nucleic acidName: DNA / Class: DNA / Structure: OTHER / Synthetic: No
Sequence: (DA)(DC)(DA)(DG)(DG)(DA)(DT)(DG)(DT)(DA) (DT)(DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC) (DA)(DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG)(DG) (DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG)(DA) (DG)(DT)(DA)(DA)(DT)(DC) ...Sequence:
(DA)(DC)(DA)(DG)(DG)(DA)(DT)(DG)(DT)(DA) (DT)(DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC) (DA)(DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG)(DG) (DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG)(DA) (DG)(DT)(DA)(DA)(DT)(DC)(DC)(DC)(DC)(DT) (DT)(DG)(DG)(DC)(DG)(DG)(DT)(DT)(DA)(DA) (DA)(DA)(DC)(DG)(DC)(DG)(DG)(DG)(DG)(DG) (DA)(DC)(DA)(DG)(DC)(DG)(DC)(DG)(DT)(DA) (DC)(DG)(DT)(DG)(DC)(DG)(DT)(DT)(DT)(DA) (DA)(DG)(DC)(DG)(DG)(DT)(DG)(DC)(DT)(DA) (DG)(DA)(DG)(DC)(DT)(DG)(DT)(DC)(DT)(DA) (DC)(DG)(DA)(DC)(DC)(DA)(DA)(DT)(DT)(DG) (DA)(DG)(DC)(DG)(DG)(DC)(DC)(DT)(DC)(DG) (DG)(DC)(DA)(DC)(DC)(DG)(DG)(DG)(DA)(DT) (DT)(DC)(DT)(DC)(DC)(DA)(DG)
MassTheoretical: 45.604047 kDa
SourceSpecies: Homo sapiens (human)

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Component #8: protein, Cyclic GMP-AMP synthase

ProteinName: Cyclic GMP-AMP synthase / Number of Copies: 1 / Recombinant expression: No
MassTheoretical: 43.647352 kDa
SourceSpecies: Mus musculus (house mouse)
Source (engineered)Expression System: Escherichia coli BL21(DE3) (bacteria)

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Component #9: ligand, ZINC ION

LigandName: ZINC ION / Number of Copies: 1 / Recombinant expression: No
MassTheoretical: 6.540905 MDa

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Experimental details

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Sample preparation

SpecimenSpecimen state: Particle / Method: cryo EM
Sample solutionSpecimen conc.: 0.4 mg/mL / pH: 7.4
VitrificationCryogen name: ETHANE / Temperature: 298 K / Humidity: 100 %

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
ImagingMicroscope: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Electron dose: 48 e/Å2 / Illumination mode: FLOOD BEAM
LensCs: 2.7 mm / Imaging mode: BRIGHT FIELD / Defocus: 700.0 - 1800.0 nm
Specimen HolderModel: OTHER
CameraDetector: GATAN K2 SUMMIT (4k x 4k)

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Image processing

ProcessingMethod: single particle reconstruction / Number of projections: 182358
3D reconstructionResolution: 2.98 Å / Resolution method: FSC 0.143 CUT-OFF
FSC plot (resolution estimation)

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Atomic model buiding

Output model

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