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- EMDB-30339: Structure of the 1:1 cGAS-nucleosome complex -

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Basic information

Entry
Database: EMDB / ID: EMD-30339
TitleStructure of the 1:1 cGAS-nucleosome complex
Map data
Sample
  • Complex: the cGAS-nucleosome complex in 1:1 molar ratio
    • Protein or peptide: Histone H3.1
    • Protein or peptide: Histone H4
    • Protein or peptide: Histone H2A type 1-B/E
    • Protein or peptide: Histone H2B type 1-J
    • Protein or peptide: Cyclic GMP-AMP synthase
    • DNA: DNA (147-MER)
    • DNA: DNA (147-MER)
KeywordscGAS / nucleosome / inhibition / cryo-EM / IMMUNE SYSTEM / STRUCTURAL PROTEIN-TRANSFERASE-DNA complex
Function / homology
Function and homology information


2',3'-cyclic GMP-AMP synthase activity / cyclic GMP-AMP synthase / STING mediated induction of host immune responses / paracrine signaling / poly-ADP-D-ribose modification-dependent protein binding / regulation of immunoglobulin production / cGAS/STING signaling pathway / regulation of T cell activation / pattern recognition receptor signaling pathway / cGMP-mediated signaling ...2',3'-cyclic GMP-AMP synthase activity / cyclic GMP-AMP synthase / STING mediated induction of host immune responses / paracrine signaling / poly-ADP-D-ribose modification-dependent protein binding / regulation of immunoglobulin production / cGAS/STING signaling pathway / regulation of T cell activation / pattern recognition receptor signaling pathway / cGMP-mediated signaling / cytoplasmic pattern recognition receptor signaling pathway / negative regulation of cGAS/STING signaling pathway / cellular response to exogenous dsRNA / negative regulation of tumor necrosis factor-mediated signaling pathway / positive regulation of type I interferon production / negative regulation of double-strand break repair via homologous recombination / negative regulation of megakaryocyte differentiation / protein localization to CENP-A containing chromatin / cAMP-mediated signaling / Chromatin modifying enzymes / Replacement of protamines by nucleosomes in the male pronucleus / CENP-A containing nucleosome / nucleosome binding / Packaging Of Telomere Ends / Recognition and association of DNA glycosylase with site containing an affected purine / Cleavage of the damaged purine / positive regulation of defense response to virus by host / phosphatidylinositol-4,5-bisphosphate binding / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / Deposition of new CENPA-containing nucleosomes at the centromere / telomere organization / Inhibition of DNA recombination at telomere / Meiotic synapsis / Interleukin-7 signaling / RNA Polymerase I Promoter Opening / activation of innate immune response / Assembly of the ORC complex at the origin of replication / Regulation of endogenous retroelements by the Human Silencing Hub (HUSH) complex / innate immune response in mucosa / SUMOylation of chromatin organization proteins / DNA methylation / Condensation of Prophase Chromosomes / Chromatin modifications during the maternal to zygotic transition (MZT) / HCMV Late Events / SIRT1 negatively regulates rRNA expression / epigenetic regulation of gene expression / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / PRC2 methylates histones and DNA / Regulation of endogenous retroelements by KRAB-ZFP proteins / Defective pyroptosis / determination of adult lifespan / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / HDACs deacetylate histones / Nonhomologous End-Joining (NHEJ) / RNA Polymerase I Promoter Escape / lipopolysaccharide binding / Transcriptional regulation by small RNAs / Formation of the beta-catenin:TCF transactivating complex / molecular condensate scaffold activity / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / G2/M DNA damage checkpoint / HDMs demethylate histones / NoRC negatively regulates rRNA expression / DNA Damage/Telomere Stress Induced Senescence / B-WICH complex positively regulates rRNA expression / PKMTs methylate histone lysines / Meiotic recombination / Pre-NOTCH Transcription and Translation / Metalloprotease DUBs / RMTs methylate histone arginines / Activation of anterior HOX genes in hindbrain development during early embryogenesis / Transcriptional regulation of granulopoiesis / HCMV Early Events / antimicrobial humoral immune response mediated by antimicrobial peptide / positive regulation of cellular senescence / structural constituent of chromatin / antibacterial humoral response / UCH proteinases / nucleosome / heterochromatin formation / E3 ubiquitin ligases ubiquitinate target proteins / nucleosome assembly / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / chromatin organization / site of double-strand break / HATs acetylate histones / RUNX1 regulates transcription of genes involved in differentiation of HSCs / Factors involved in megakaryocyte development and platelet production / MLL4 and MLL3 complexes regulate expression of PPARG target genes in adipogenesis and hepatic steatosis / Processing of DNA double-strand break ends / Senescence-Associated Secretory Phenotype (SASP) / double-stranded DNA binding / defense response to Gram-negative bacterium / Oxidative Stress Induced Senescence / gene expression / killing of cells of another organism / defense response to virus / Estrogen-dependent gene expression
Similarity search - Function
Mab-21-like, nucleotidyltransferase domain / Mab-21 protein nucleotidyltransferase domain / Mab-21-like / Mab-21-like, HhH/H2TH-like domain / Mab-21 protein HhH/H2TH-like domain / Mab-21 / : / Histone H2B signature. / Histone H2B / Histone H2B ...Mab-21-like, nucleotidyltransferase domain / Mab-21 protein nucleotidyltransferase domain / Mab-21-like / Mab-21-like, HhH/H2TH-like domain / Mab-21 protein HhH/H2TH-like domain / Mab-21 / : / Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A conserved site / Histone H2A signature. / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone H2A / Histone 2A / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 / Histone-fold
Similarity search - Domain/homology
Histone H2A type 1-B/E / Histone H2B type 1-J / Histone H4 / Histone H3.1 / Cyclic GMP-AMP synthase
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsCao D / Han X
Funding support China, 7 items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2017YFA0504700 China
Ministry of Science and Technology (MoST, China)2019YFA0508900 China
National Natural Science Foundation of China (NSFC)31930069 China
National Natural Science Foundation of China (NSFC)31521002 China
National Natural Science Foundation of China (NSFC)31991162 China
Chinese Academy of SciencesXDB37040101 China
Chinese Academy of SciencesXDB37010101 China
CitationJournal: Cell Res / Year: 2020
Title: Structural basis for nucleosome-mediated inhibition of cGAS activity.
Authors: Duanfang Cao / Xiaonan Han / Xiaoyi Fan / Rui-Ming Xu / Xinzheng Zhang /
Abstract: Activation of cyclic GMP-AMP synthase (cGAS) through sensing cytosolic double stranded DNA (dsDNA) plays a pivotal role in innate immunity against exogenous infection as well as cellular regulation ...Activation of cyclic GMP-AMP synthase (cGAS) through sensing cytosolic double stranded DNA (dsDNA) plays a pivotal role in innate immunity against exogenous infection as well as cellular regulation under stress. Aberrant activation of cGAS induced by self-DNA is related to autoimmune diseases. cGAS accumulates at chromosomes during mitosis or spontaneously in the nucleus. Binding of cGAS to the nucleosome competitively attenuates the dsDNA-mediated cGAS activation, but the molecular mechanism of the attenuation is still poorly understood. Here, we report two cryo-electron microscopy structures of cGAS-nucleosome complexes. The structures reveal that cGAS interacts with the nucleosome as a monomer, forming 1:1 and 2:2 complexes, respectively. cGAS contacts the nucleosomal acidic patch formed by the H2A-H2B heterodimer through the dsDNA-binding site B in both complexes, and could interact with the DNA from the other symmetrically placed nucleosome via the dsDNA-binding site C in the 2:2 complex. The bound nucleosome inhibits the activation of cGAS through blocking the interaction of cGAS with ligand dsDNA and disrupting cGAS dimerization. R236A or R255A mutation of cGAS impairs the binding between cGAS and the nucleosome, and largely relieves the nucleosome-mediated inhibition of cGAS activity. Our study provides structural insights into the inhibition of cGAS activity by the nucleosome, and advances the understanding of the mechanism by which hosts avoid the autoimmune attack caused by cGAS.
History
DepositionJun 17, 2020-
Header (metadata) releaseOct 7, 2020-
Map releaseOct 7, 2020-
UpdateMar 27, 2024-
Current statusMar 27, 2024Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.02
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  • Surface view with fitted model
  • Atomic models: PDB-7ccq
  • Surface level: 0.02
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_30339.png

Downloads & links

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Map

FileDownload / File: emd_30339.map.gz / Format: CCP4 / Size: 98.9 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 Å/pix.
x 296 pix.
= 296. Å		1 Å/pix.
x 296 pix.
= 296. Å		1 Å/pix.
x 296 pix.
= 296. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.009 / Movie #1: 0.02
Minimum - Maximum-0.07477684 - 0.12610628
Average (Standard dev.)0.00015361777 (±0.0041287425)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions296296296
Spacing296296296
CellA=B=C: 296.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z111
M x/y/z296296296
origin x/y/z0.0000.0000.000
length x/y/z296.000296.000296.000
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ510510510
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS296296296
D min/max/mean-0.0750.1260.000

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Supplemental data

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Additional map: #1

Fileemd_30339_additional_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : the cGAS-nucleosome complex in 1:1 molar ratio

EntireName: the cGAS-nucleosome complex in 1:1 molar ratio
Components
  • Complex: the cGAS-nucleosome complex in 1:1 molar ratio
    • Protein or peptide: Histone H3.1
    • Protein or peptide: Histone H4
    • Protein or peptide: Histone H2A type 1-B/E
    • Protein or peptide: Histone H2B type 1-J
    • Protein or peptide: Cyclic GMP-AMP synthase
    • DNA: DNA (147-MER)
    • DNA: DNA (147-MER)

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Supramolecule #1: the cGAS-nucleosome complex in 1:1 molar ratio

SupramoleculeName: the cGAS-nucleosome complex in 1:1 molar ratio / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Histone H3.1

MacromoleculeName: Histone H3.1 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 11.504476 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
PHRYRPGTVA LREIRRYQKS TELLIRKLPF QRLVREIAQD FKTDLRFQSS AVMALQEACE AYLVGLFEDT NLCAIHAKRV TIMPKDIQL ARRIRGERA

UniProtKB: Histone H3.1

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Macromolecule #2: Histone H4

MacromoleculeName: Histone H4 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 9.067586 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
RDNIQGITKP AIRRLARRGG VKRISGLIYE ETRGVLKVFL ENVIRDAVTY TEHAKRKTVT AMDVVYALKR QGRTLYGFGG

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Macromolecule #3: Histone H2A type 1-B/E

MacromoleculeName: Histone H2A type 1-B/E / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 11.308161 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
KTRSSRAGLQ FPVGRVHRLL RKGNYSERVG AGAPVYLAAV LEYLTAEILE LAGNAARDNK KTRIIPRHLQ LAIRNDEELN KLLGRVTIA QGGVLPNIQA VLLP

UniProtKB: Histone H2A type 1-B/E

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Macromolecule #4: Histone H2B type 1-J

MacromoleculeName: Histone H2B type 1-J / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 10.334827 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
SRKESYSIYV YKVLKQVHPD TGISSKAMGI MNSFVNDIFE RIAGEASRLA HYNKRSTITS REIQTAVRLL LPGELAKHAV SEGTKAVTK YTSA

UniProtKB: Histone H2B type 1-J

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Macromolecule #5: Cyclic GMP-AMP synthase

MacromoleculeName: Cyclic GMP-AMP synthase / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO / EC number: cyclic GMP-AMP synthase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 42.75927 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: DAAPGASKLR AVLEKLKLSR DDISTAAGMV KGVVDHLLLR LKCDSAFRGV GLLNTGSYYE HVKISAPNEF DVMFKLEVPR IQLEEYSNT RAYYFVKFKR NPKENPLSQF LEGEILSASK MLSKFRKIIK EEINDIKDTD VIMKRKRGGS PAVTLLISEK I SVDITLAL ...String:
DAAPGASKLR AVLEKLKLSR DDISTAAGMV KGVVDHLLLR LKCDSAFRGV GLLNTGSYYE HVKISAPNEF DVMFKLEVPR IQLEEYSNT RAYYFVKFKR NPKENPLSQF LEGEILSASK MLSKFRKIIK EEINDIKDTD VIMKRKRGGS PAVTLLISEK I SVDITLAL ESKSSWPAST QEGLRIQNWL SAKVRKQLRL KPFYLVPKHA KEGNGFQEET WRLSFSHIEK EILNNHGKSK TC CENKEEK CCRKDCLKLM KYLLEQLKER FKDKKHLDKF SSYHVKTAFF HVCTQNPQDS QWDRKDLGLC FDNCVTYFLQ CLR TEKLEN YFIPEFNLFS SNLIDKRSKE FLTKQIEYER NNEFPVFDEF

UniProtKB: Cyclic GMP-AMP synthase

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Macromolecule #6: DNA (147-MER)

MacromoleculeName: DNA (147-MER) / type: dna / ID: 6 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 45.604047 KDa
SequenceString: (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) ...String:
(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)

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Macromolecule #7: DNA (147-MER)

MacromoleculeName: DNA (147-MER) / type: dna / ID: 7 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 45.145754 KDa
SequenceString: (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) ...String:
(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)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TECNAI ARCTICA
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 133590
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: PROJECTION MATCHING

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