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Open data
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Basic information
Entry | Database: PDB / ID: 7a08 | ||||||
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Title | CryoEM Structure of cGAS Nucleosome complex | ||||||
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![]() | TRANSFERASE / complex / immune protein / nuclear protein | ||||||
Function / homology | ![]() negative regulation of chromosome condensation / Barr body / regulation of centromere complex assembly / regulation of type I interferon production / cyclic GMP-AMP synthase / 2',3'-cyclic GMP-AMP synthase activity / muscle cell differentiation / pericentric heterochromatin formation / inner kinetochore / paracrine signaling ...negative regulation of chromosome condensation / Barr body / regulation of centromere complex assembly / regulation of type I interferon production / cyclic GMP-AMP synthase / 2',3'-cyclic GMP-AMP synthase activity / muscle cell differentiation / pericentric heterochromatin formation / inner kinetochore / paracrine signaling / poly-ADP-D-ribose modification-dependent protein binding / negative regulation of DNA repair / regulation of immunoglobulin production / cGAS/STING signaling pathway / regulation of T cell activation / oocyte maturation / negative regulation of cGAS/STING signaling pathway / nucleus organization / cGMP-mediated signaling / cellular response to exogenous dsRNA / spermatid development / subtelomeric heterochromatin formation / regulation of immune response / positive regulation of type I interferon production / single fertilization / RNA polymerase II core promoter sequence-specific DNA binding / negative regulation of megakaryocyte differentiation / nucleosome binding / negative regulation of double-strand break repair via homologous recombination / protein localization to CENP-A containing chromatin / Replacement of protamines by nucleosomes in the male pronucleus / CENP-A containing nucleosome / 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 / nucleosomal DNA binding / Deposition of new CENPA-containing nucleosomes at the centromere / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / phosphatidylinositol-4,5-bisphosphate binding / Inhibition of DNA recombination at telomere / Meiotic synapsis / activation of innate immune response / telomere organization / embryo implantation / RNA Polymerase I Promoter Opening / Assembly of the ORC complex at the origin of replication / SUMOylation of chromatin organization proteins / cAMP-mediated signaling / DNA methylation / Condensation of Prophase Chromosomes / molecular condensate scaffold activity / SIRT1 negatively regulates rRNA expression / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / Chromatin modifications during the maternal to zygotic transition (MZT) / HCMV Late Events / innate immune response in mucosa / PRC2 methylates histones and DNA / Defective pyroptosis / determination of adult lifespan / HDACs deacetylate histones / RNA Polymerase I Promoter Escape / Nonhomologous End-Joining (NHEJ) / Transcriptional regulation by small RNAs / Formation of the beta-catenin:TCF transactivating complex / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / NoRC negatively regulates rRNA expression / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / multicellular organism growth / G2/M DNA damage checkpoint / HDMs demethylate histones / B-WICH complex positively regulates rRNA expression / heterochromatin formation / DNA Damage/Telomere Stress Induced Senescence / Metalloprotease DUBs / PKMTs methylate histone lysines / Meiotic recombination / Pre-NOTCH Transcription and Translation / RMTs methylate histone arginines / Activation of anterior HOX genes in hindbrain development during early embryogenesis / HCMV Early Events / osteoblast differentiation / Transcriptional regulation of granulopoiesis / structural constituent of chromatin / positive regulation of cellular senescence / male gonad development / UCH proteinases / antimicrobial humoral immune response mediated by antimicrobial peptide / nucleosome / nucleosome assembly / E3 ubiquitin ligases ubiquitinate target proteins / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / chromatin organization / RUNX1 regulates transcription of genes involved in differentiation of HSCs / site of double-strand break / Factors involved in megakaryocyte development and platelet production / HATs acetylate histones / antibacterial humoral response / Processing of DNA double-strand break ends Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() synthetic construct (others) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.11 Å | ||||||
![]() | Michalski, S. / de Oliveira Mann, C.C. / Witte, G. / Bartho, J. / Lammens, K. / Hopfner, K.P. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis for sequestration and autoinhibition of cGAS by chromatin. Authors: Sebastian Michalski / Carina C de Oliveira Mann / Che A Stafford / Gregor Witte / Joseph Bartho / Katja Lammens / Veit Hornung / Karl-Peter Hopfner / ![]() Abstract: Cyclic GMP-AMP synthase (cGAS) is an innate immune sensor for cytosolic microbial DNA. After binding DNA, cGAS synthesizes the messenger 2'3'-cyclic GMP-AMP (cGAMP), which triggers cell-autonomous ...Cyclic GMP-AMP synthase (cGAS) is an innate immune sensor for cytosolic microbial DNA. After binding DNA, cGAS synthesizes the messenger 2'3'-cyclic GMP-AMP (cGAMP), which triggers cell-autonomous defence and the production of type I interferons and pro-inflammatory cytokines via the activation of STING. In addition to responding to cytosolic microbial DNA, cGAS also recognizes mislocalized cytosolic self-DNA and has been implicated in autoimmunity and sterile inflammation. Specificity towards pathogen- or damage-associated DNA was thought to be caused by cytosolic confinement. However, recent findings place cGAS robustly in the nucleus, where tight tethering of chromatin is important to prevent autoreactivity to self-DNA. Here we show how cGAS is sequestered and inhibited by chromatin. We provide a cryo-electron microscopy structure of the cGAS catalytic domain bound to a nucleosome, which shows that cGAS does not interact with the nucleosomal DNA, but instead interacts with histone 2A-histone 2B, and is tightly anchored to the 'acidic patch'. The interaction buries the cGAS DNA-binding site B, and blocks the formation of active cGAS dimers. The acidic patch robustly outcompetes agonistic DNA for binding to cGAS, which suggests that nucleosome sequestration can efficiently inhibit cGAS, even when accessible DNA is nearby, such as in actively transcribed genomic regions. Our results show how nuclear cGAS is sequestered by chromatin and provides a mechanism for preventing autoreactivity to nuclear self-DNA. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 324.7 KB | Display | ![]() |
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PDB format | ![]() | 253.4 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 11601MC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Protein , 5 types, 9 molecules abfcgdhei
#1: Protein | Mass: 43401.180 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() | ||||||
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#4: Protein | Mass: 14004.329 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #5: Protein | Mass: 13806.018 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: HIST1H2BC, H2BFL, HIST1H2BE, H2BFH, HIST1H2BF, H2BFG, HIST1H2BG, H2BFA, HIST1H2BI, H2BFK Production host: ![]() ![]() #6: Protein | Mass: 15229.787 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #7: Protein | Mass: 11263.231 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: HIST1H4A, H4/A, H4FA, HIST1H4B, H4/I, H4FI, HIST1H4C, H4/G, H4FG, HIST1H4D, H4/B, H4FB, HIST1H4E, H4/J, H4FJ, HIST1H4F, H4/C, H4FC, HIST1H4H, H4/H, H4FH, HIST1H4I, H4/M, H4FM, HIST1H4J, H4/E, ...Gene: HIST1H4A, H4/A, H4FA, HIST1H4B, H4/I, H4FI, HIST1H4C, H4/G, H4FG, HIST1H4D, H4/B, H4FB, HIST1H4E, H4/J, H4FJ, HIST1H4F, H4/C, H4FC, HIST1H4H, H4/H, H4FH, HIST1H4I, H4/M, H4FM, HIST1H4J, H4/E, H4FE, HIST1H4K, H4/D, H4FD, HIST1H4L, H4/K, H4FK, HIST2H4A, H4/N, H4F2, H4FN, HIST2H4, HIST2H4B, H4/O, H4FO, HIST4H4 Production host: ![]() ![]() |
-Nucleosomal DNA strand ... , 2 types, 2 molecules IJ
#2: DNA chain | Mass: 45145.754 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others) |
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#3: DNA chain | Mass: 45604.047 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others) |
-Non-polymers , 1 types, 1 molecules ![](data/chem/img/ZN.gif)
#8: Chemical | ChemComp-ZN / |
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-Details
Has ligand of interest | N |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
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Buffer solution | pH: 7.5 | ||||||||||||||||||||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid type: Quantifoil | ||||||||||||||||||||||||||||||
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 44.8 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.18.2_3874: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.11 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 172977 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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