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- PDB-8okx: Structure of cGAS in complex with SPSB3-ELOBC -

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Basic information

Entry
Database: PDB / ID: 8okx
TitleStructure of cGAS in complex with SPSB3-ELOBC
Components
  • Cyclic GMP-AMP synthase
  • Elongin-B
  • Elongin-C
  • SPRY domain-containing SOCS box protein 3
KeywordsIMMUNE SYSTEM / cGAS / degradation / UPS
Function / homology
Function and homology information


cyclic GMP-AMP synthase / 2',3'-cyclic GMP-AMP synthase activity / STING mediated induction of host immune responses / target-directed miRNA degradation / paracrine signaling / poly-ADP-D-ribose modification-dependent protein binding / elongin complex / VCB complex / regulation of immunoglobulin production / cGAS/STING signaling pathway ...cyclic GMP-AMP synthase / 2',3'-cyclic GMP-AMP synthase activity / STING mediated induction of host immune responses / target-directed miRNA degradation / paracrine signaling / poly-ADP-D-ribose modification-dependent protein binding / elongin complex / VCB complex / regulation of immunoglobulin production / cGAS/STING signaling pathway / Cul5-RING ubiquitin ligase complex / pattern recognition receptor signaling pathway / regulation of T cell activation / SCF ubiquitin ligase complex / Cul2-RING ubiquitin ligase complex / cytoplasmic pattern recognition receptor signaling pathway / negative regulation of cGAS/STING signaling pathway / cGMP-mediated signaling / cellular response to exogenous dsRNA / Pausing and recovery of Tat-mediated HIV elongation / Tat-mediated HIV elongation arrest and recovery / HIV elongation arrest and recovery / Pausing and recovery of HIV elongation / positive regulation of type I interferon production / Tat-mediated elongation of the HIV-1 transcript / Formation of HIV-1 elongation complex containing HIV-1 Tat / negative regulation of double-strand break repair via homologous recombination / Formation of HIV elongation complex in the absence of HIV Tat / RNA Polymerase II Transcription Elongation / Formation of RNA Pol II elongation complex / nucleosome binding / positive regulation of defense response to virus by host / RNA Polymerase II Pre-transcription Events / phosphatidylinositol-4,5-bisphosphate binding / activation of innate immune response / cAMP-mediated signaling / transcription corepressor binding / molecular condensate scaffold activity / transcription elongation by RNA polymerase II / determination of adult lifespan / transcription initiation at RNA polymerase II promoter / TP53 Regulates Transcription of DNA Repair Genes / Vif-mediated degradation of APOBEC3G / Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha / Inactivation of CSF3 (G-CSF) signaling / Evasion by RSV of host interferon responses / Regulation of expression of SLITs and ROBOs / positive regulation of cellular senescence / Antigen processing: Ubiquitination & Proteasome degradation / positive regulation of proteasomal ubiquitin-dependent protein catabolic process / protein-macromolecule adaptor activity / Neddylation / site of double-strand break / ubiquitin-dependent protein catabolic process / double-stranded DNA binding / protein-containing complex assembly / proteasome-mediated ubiquitin-dependent protein catabolic process / defense response to virus / nuclear body / protein ubiquitination / DNA repair / innate immune response / ubiquitin protein ligase binding / DNA damage response / chromatin binding / GTP binding / regulation of transcription by RNA polymerase II / protein homodimerization activity / DNA binding / nucleoplasm / ATP binding / nucleus / metal ion binding / plasma membrane / cytoplasm / cytosol
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-like, HhH/H2TH-like domain / Mab-21 protein HhH/H2TH-like domain / Mab-21 protein nucleotidyltransferase domain / Mab-21-like / Mab-21 ...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-like, HhH/H2TH-like domain / Mab-21 protein HhH/H2TH-like domain / Mab-21 protein nucleotidyltransferase domain / Mab-21-like / Mab-21 / Elongin B / Elongin-C / 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. / SPRY domain / B30.2/SPRY domain superfamily / Domain in SPla and the RYanodine Receptor. / SKP1/BTB/POZ domain superfamily / Ubiquitin family / Ubiquitin homologues / Ubiquitin domain profile. / Ubiquitin-like domain / Concanavalin A-like lectin/glucanase domain superfamily / Ubiquitin-like domain superfamily
Similarity search - Domain/homology
Elongin-C / Elongin-B / SPRY domain-containing SOCS box protein 3 / Cyclic GMP-AMP synthase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.51 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
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
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Cyclic GMP-AMP synthase
B: SPRY domain-containing SOCS box protein 3
C: Elongin-C
D: Elongin-B
hetero molecules


Theoretical massNumber of molelcules
Total (without water)95,8285
Polymers95,7624
Non-polymers651
Water00
1


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

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Components

#1: Protein Cyclic GMP-AMP synthase / cGAMP synthase / cGAS / h-cGAS / 2'3'-cGAMP synthase / Mab-21 domain-containing protein 1


Mass: 42714.145 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
#2: 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
#3: 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
#4: 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
#5: Chemical ChemComp-ZN / ZINC ION


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

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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
Specimen supportGrid material: COPPER / Grid type: C-flat-2/2
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
CTF correctionType: NONE
3D reconstructionResolution: 3.51 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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