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- PDB-8ol1: cGAS-Nucleosome in complex with SPSB3-ELOBC (composite structure) -

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Basic information

Entry
Database: PDB / ID: 8ol1
TitlecGAS-Nucleosome in complex with SPSB3-ELOBC (composite structure)
Components
  • (DNA (145-MER)) x 2
  • (Histone H2A type 1- ...) x 2
  • (Histone H2B type 1- ...) x 2
  • Cyclic GMP-AMP synthase
  • Elongin-B
  • Elongin-C
  • Histone H3.2
  • Histone H4
  • SPRY domain-containing SOCS box protein 3
KeywordsIMMUNE SYSTEM / cGAS / degradation / UPS
Function / homology
Function and homology information


2',3'-cyclic GMP-AMP synthase activity / cyclic GMP-AMP synthase / paracrine signaling / STING mediated induction of host immune responses / poly-ADP-D-ribose modification-dependent protein binding / regulation of immunoglobulin production / target-directed miRNA degradation / elongin complex / regulation of T cell activation / cGAS/STING signaling pathway ...2',3'-cyclic GMP-AMP synthase activity / cyclic GMP-AMP synthase / paracrine signaling / STING mediated induction of host immune responses / poly-ADP-D-ribose modification-dependent protein binding / regulation of immunoglobulin production / target-directed miRNA degradation / elongin complex / regulation of T cell activation / cGAS/STING signaling pathway / VCB complex / Cul5-RING ubiquitin ligase complex / pattern recognition receptor signaling pathway / negative regulation of epithelial to mesenchymal transition / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / SCF ubiquitin ligase complex / STAT family protein binding / Cul2-RING ubiquitin ligase complex / negative regulation of cGAS/STING signaling pathway / cellular response to exogenous dsRNA / RSV-host interactions / cytoplasmic pattern recognition receptor signaling pathway / Pausing and recovery of Tat-mediated HIV elongation / Tat-mediated HIV elongation arrest and recovery / ubiquitin-like protein ligase binding / HIV elongation arrest and recovery / Pausing and recovery of HIV elongation / negative regulation of double-strand break repair via homologous recombination / Tat-mediated elongation of the HIV-1 transcript / Formation of HIV-1 elongation complex containing HIV-1 Tat / nucleosome binding / Formation of HIV elongation complex in the absence of HIV Tat / ubiquitin-like ligase-substrate adaptor activity / negative regulation of megakaryocyte differentiation / RNA Polymerase II Transcription Elongation / protein localization to CENP-A containing chromatin / Formation of RNA Pol II elongation complex / Chromatin modifying enzymes / positive regulation of defense response to virus by host / Replacement of protamines by nucleosomes in the male pronucleus / positive regulation of type I interferon production / CENP-A containing nucleosome / phosphatidylinositol-4,5-bisphosphate binding / protein K48-linked ubiquitination / Packaging Of Telomere Ends / RNA Polymerase II Pre-transcription Events / Recognition and association of DNA glycosylase with site containing an affected purine / Cleavage of the damaged purine / activation of innate immune response / Deposition of new CENPA-containing nucleosomes at the centromere / telomere organization / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / Interleukin-7 signaling / RNA Polymerase I Promoter Opening / Inhibition of DNA recombination at telomere / Assembly of the ORC complex at the origin of replication / Meiotic synapsis / SUMOylation of chromatin organization proteins / Regulation of endogenous retroelements by the Human Silencing Hub (HUSH) complex / transcription corepressor binding / DNA methylation / Condensation of Prophase Chromosomes / Chromatin modifications during the maternal to zygotic transition (MZT) / SIRT1 negatively regulates rRNA expression / HCMV Late Events / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / determination of adult lifespan / PRC2 methylates histones and DNA / Regulation of endogenous retroelements by KRAB-ZFP proteins / Defective pyroptosis / TP53 Regulates Transcription of DNA Repair Genes / HDACs deacetylate histones / transcription initiation at RNA polymerase II promoter / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / Nonhomologous End-Joining (NHEJ) / RNA Polymerase I Promoter Escape / transcription elongation by RNA polymerase II / molecular condensate scaffold activity / Transcriptional regulation by small RNAs / Formation of the beta-catenin:TCF transactivating complex / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / HDMs demethylate histones / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / G2/M DNA damage checkpoint / Negative Regulation of CDH1 Gene Transcription / Vif-mediated degradation of APOBEC3G / NoRC negatively regulates rRNA expression / Inactivation of CSF3 (G-CSF) signaling / PKMTs methylate histone lysines / B-WICH complex positively regulates rRNA expression / DNA Damage/Telomere Stress Induced Senescence / Pre-NOTCH Transcription and Translation / Evasion by RSV of host interferon responses / Meiotic recombination / Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha / Activation of anterior HOX genes in hindbrain development during early embryogenesis / Transcriptional regulation of granulopoiesis / Metalloprotease DUBs / RMTs methylate histone arginines
Similarity search - Function
SPRY domain-containing SOCS box protein 3, SPRY domain / : / SOCS box domain / SOCS box domain profile. / SOCS_box / 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 ...SPRY domain-containing SOCS box protein 3, SPRY domain / : / SOCS box domain / SOCS box domain profile. / SOCS_box / 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 / Elongin-C / Elongin B / S-phase kinase-associated protein 1-like / SKP1 component, POZ domain / Skp1 family, tetramerisation domain / Found in Skp1 protein family / SPRY domain / B30.2/SPRY domain / B30.2/SPRY domain profile. / B30.2/SPRY domain superfamily / Domain in SPla and the RYanodine Receptor. / SPRY domain / SKP1/BTB/POZ domain superfamily / : / Histone H2A conserved site / Histone H2A signature. / Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone 2A / Histone H2A / 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 domain / Histone-fold / Ubiquitin family / Ubiquitin homologues / Ubiquitin domain profile. / Concanavalin A-like lectin/glucanase domain superfamily / Ubiquitin-like domain / Ubiquitin-like domain superfamily
Similarity search - Domain/homology
DNA / DNA (> 10) / DNA (> 100) / Histone H4 / Elongin-C / Elongin-B / SPRY domain-containing SOCS box protein 3 / Histone H3.2 / Cyclic GMP-AMP synthase / Histone H2B type 1-H ...DNA / DNA (> 10) / DNA (> 100) / Histone H4 / Elongin-C / Elongin-B / SPRY domain-containing SOCS box protein 3 / Histone H3.2 / Cyclic GMP-AMP synthase / Histone H2B type 1-H / Histone H2A type 1-H / Histone H2B type 1-N / Histone H2A type 1-J
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsXu, P.B. / Ablasser, A.
Funding supportEuropean Union, 1items
OrganizationGrant numberCountry
European Molecular Biology Organization (EMBO)ALTF 184-2021European Union
CitationJournal: Nature / Year: 2024
Title: The CRL5-SPSB3 ubiquitin ligase targets nuclear cGAS for degradation.
Authors: Pengbiao Xu / Ying Liu / Chong Liu / Baptiste Guey / Lingyun Li / Pauline Melenec / Jonathan Ricci / Andrea Ablasser /
Abstract: Cyclic GMP-AMP synthase (cGAS) senses aberrant DNA during infection, cancer and inflammatory disease, and initiates potent innate immune responses through the synthesis of 2'3'-cyclic GMP-AMP (cGAMP). ...Cyclic GMP-AMP synthase (cGAS) senses aberrant DNA during infection, cancer and inflammatory disease, and initiates potent innate immune responses through the synthesis of 2'3'-cyclic GMP-AMP (cGAMP). The indiscriminate activity of cGAS towards DNA demands tight regulatory mechanisms that are necessary to maintain cell and tissue homeostasis under normal conditions. Inside the cell nucleus, anchoring to nucleosomes and competition with chromatin architectural proteins jointly prohibit cGAS activation by genomic DNA. However, the fate of nuclear cGAS and its role in cell physiology remains unclear. Here we show that the ubiquitin proteasomal system (UPS) degrades nuclear cGAS in cycling cells. We identify SPSB3 as the cGAS-targeting substrate receptor that associates with the cullin-RING ubiquitin ligase 5 (CRL5) complex to ligate ubiquitin onto nuclear cGAS. A cryo-electron microscopy structure of nucleosome-bound cGAS in a complex with SPSB3 reveals a highly conserved Asn-Asn (NN) minimal degron motif at the C terminus of cGAS that directs SPSB3 recruitment, ubiquitylation and cGAS protein stability. Interference with SPSB3-regulated nuclear cGAS degradation primes cells for type I interferon signalling, conferring heightened protection against infection by DNA viruses. Our research defines protein degradation as a determinant of cGAS regulation in the nucleus and provides structural insights into an element of cGAS that is amenable to therapeutic exploitation.
History
DepositionMar 29, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Feb 14, 2024Provider: repository / Type: Initial release
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Revision 1.1Mar 13, 2024Group: Database references / Category: citation / citation_author / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Apr 10, 2024Group: Database references / Category: citation / citation_author
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Revision 1.3Jul 9, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details
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Revision 1.1Jul 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Histone H3.2
B: Histone H4
C: Histone H2A type 1-H
D: Histone H2B type 1-H
E: Histone H3.2
F: Histone H4
G: Histone H2A type 1-J
H: Histone H2B type 1-N
I: DNA (145-MER)
J: DNA (145-MER)
K: Cyclic GMP-AMP synthase
L: SPRY domain-containing SOCS box protein 3
M: Elongin-C
N: Elongin-B
hetero molecules


Theoretical massNumber of molelcules
Total (without water)270,83215
Polymers270,76714
Non-polymers651
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 6 types, 8 molecules AEBFKLMN

#1: Protein Histone H3.2 / H3-clustered histone 13 / H3-clustered histone 14 / H3-clustered histone 15 / Histone H3/m / Histone H3/o


Mass: 11546.513 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human)
Gene: H3C15, HIST2H3A, H3C14, H3F2, H3FM, HIST2H3C, H3C13, HIST2H3D
Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q71DI3
#2: Protein Histone H4


Mass: 9180.745 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human)
Gene: H4C1, H4/A, H4FA, HIST1H4A, H4C2, H4/I, H4FI, HIST1H4B, H4C3, H4/G, H4FG, HIST1H4C, H4C4, H4/B, H4FB, HIST1H4D, H4C5, H4/J, H4FJ, HIST1H4E, H4C6, H4/C, H4FC, HIST1H4F, H4C8, H4/H, H4FH, ...Gene: H4C1, H4/A, H4FA, HIST1H4A, H4C2, H4/I, H4FI, HIST1H4B, H4C3, H4/G, H4FG, HIST1H4C, H4C4, H4/B, H4FB, HIST1H4D, H4C5, H4/J, H4FJ, HIST1H4E, H4C6, H4/C, H4FC, HIST1H4F, H4C8, H4/H, H4FH, HIST1H4H, H4C9, H4/M, H4FM, HIST1H4I, H4C11, H4/E, H4FE, HIST1H4J, H4C12, H4/D, H4FD, HIST1H4K, H4C13, H4/K, H4FK, HIST1H4L, H4C14, H4/N, H4F2, H4FN, HIST2H4, HIST2H4A, H4C15, H4/O, H4FO, HIST2H4B, H4C16, H4-16, HIST4H4
Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P62805
#9: Protein Cyclic GMP-AMP synthase / cGAMP synthase / cGAS / h-cGAS / 2'3'-cGAMP synthase / Mab-21 domain-containing protein 1


Mass: 42202.590 Da / Num. of mol.: 1 / Mutation: K285A R300A K428A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CGAS, C6orf150, MB21D1 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q8N884, cyclic GMP-AMP synthase
#10: Protein SPRY domain-containing SOCS box protein 3 / SSB-3


Mass: 27415.240 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SPSB3, C16orf31, SSB3 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q6PJ21
#11: Protein Elongin-C / EloC / Elongin 15 kDa subunit / RNA polymerase II transcription factor SIII subunit C / SIII p15 / ...EloC / Elongin 15 kDa subunit / RNA polymerase II transcription factor SIII subunit C / SIII p15 / Transcription elongation factor B polypeptide 1


Mass: 12485.135 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ELOC, TCEB1 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q15369
#12: Protein Elongin-B / EloB / Elongin 18 kDa subunit / RNA polymerase II transcription factor SIII subunit B / SIII p18 / ...EloB / Elongin 18 kDa subunit / RNA polymerase II transcription factor SIII subunit B / SIII p18 / Transcription elongation factor B polypeptide 2


Mass: 13147.781 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ELOB, TCEB2 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q15370

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Histone H2A type 1- ... , 2 types, 2 molecules CG

#3: Protein Histone H2A type 1-H / H2A-clustered histone 12 / Histone H2A/s


Mass: 11763.755 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H2AC12, HIST1H2AH, HIST1H2AI / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q96KK5
#5: Protein Histone H2A type 1-J / Histone H2A/e


Mass: 11666.640 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H2AC14, H2AFE, HIST1H2AJ / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q99878

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Histone H2B type 1- ... , 2 types, 2 molecules DH

#4: Protein Histone H2B type 1-H / H2B-clustered histone 9 / Histone H2B.j / H2B/j


Mass: 10623.174 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H2BC9, H2BFJ, HIST1H2BH / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q93079
#6: Protein Histone H2B type 1-N / Histone H2B.d / H2B/d


Mass: 10493.994 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H2BC15, H2BFD, HIST1H2BN / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q99877

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DNA chain , 2 types, 2 molecules IJ

#7: DNA chain DNA (145-MER)


Mass: 44552.379 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Homo sapiens (human)
#8: DNA chain DNA (145-MER)


Mass: 44961.633 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Homo sapiens (human)

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Non-polymers , 1 types, 1 molecules

#13: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: cGAS-Spsb3-EloBC complex / Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.4 / Details: PBS buffer
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20rc2_4400: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 592494 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0076555
ELECTRON MICROSCOPYf_angle_d0.7928824
ELECTRON MICROSCOPYf_dihedral_angle_d4.581864
ELECTRON MICROSCOPYf_chiral_restr0.043959
ELECTRON MICROSCOPYf_plane_restr0.0081129

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