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- PDB-9qo6: 9-subunit COP9 signalosome complex -

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Basic information

Entry
Database: PDB / ID: 9qo6
Title9-subunit COP9 signalosome complex
Components(COP9 signalosome complex subunit ...) x 9
KeywordsHYDROLASE / COP9 signalosome
Function / homology
Function and homology information


negative regulation of protein localization to nucleolus / COP9 signalosome assembly / trophectodermal cell proliferation / macrophage migration inhibitory factor binding / regulation of IRE1-mediated unfolded protein response / exosomal secretion / GTPase inhibitor activity / deNEDDylase activity / protein deneddylation / regulation of protein neddylation ...negative regulation of protein localization to nucleolus / COP9 signalosome assembly / trophectodermal cell proliferation / macrophage migration inhibitory factor binding / regulation of IRE1-mediated unfolded protein response / exosomal secretion / GTPase inhibitor activity / deNEDDylase activity / protein deneddylation / regulation of protein neddylation / activation of NF-kappaB-inducing kinase activity / eukaryotic translation initiation factor 3 complex / COP9 signalosome / negative regulation of protein neddylation / protein neddylation / Hydrolases; Acting on peptide bonds (peptidases) / regulation of JNK cascade / RHOBTB1 GTPase cycle / metal-dependent deubiquitinase activity / regulation of DNA damage response, signal transduction by p53 class mediator / inner cell mass cell proliferation / response to light stimulus / skeletal muscle cell differentiation / : / JNK cascade / translation initiation factor activity / post-translational protein modification / DNA Damage Recognition in GG-NER / Formation of TC-NER Pre-Incision Complex / metallopeptidase activity / neuron differentiation / synaptic vesicle / cellular response to UV / cell junction / transcription corepressor activity / Cargo recognition for clathrin-mediated endocytosis / Neddylation / ubiquitin-dependent protein catabolic process / in utero embryonic development / transcription by RNA polymerase II / transcription coactivator activity / protein phosphorylation / regulation of cell cycle / nuclear speck / translation / negative regulation of cell population proliferation / positive regulation of cell population proliferation / negative regulation of apoptotic process / chromatin / perinuclear region of cytoplasm / enzyme binding / negative regulation of transcription by RNA polymerase II / signal transduction / positive regulation of transcription by RNA polymerase II / proteolysis / extracellular exosome / nucleoplasm / metal ion binding / nucleus / cytosol / cytoplasm
Similarity search - Function
COP9 signalosome complex, subunit 9, metazoa / Myeloma-overexpressed-like / COP9 signalosome complex subunit 7, helix I / : / COP9 signalosome complex subunit 7a helix I domain / COP9 signalosome complex subunit 3-like, C-terminal helix / CSN7 helical bundle subdomain / COP9 signalosome, subunit CSN8 / COP9 signalosome complex subunit 4, helix turn helix domain / : ...COP9 signalosome complex, subunit 9, metazoa / Myeloma-overexpressed-like / COP9 signalosome complex subunit 7, helix I / : / COP9 signalosome complex subunit 7a helix I domain / COP9 signalosome complex subunit 3-like, C-terminal helix / CSN7 helical bundle subdomain / COP9 signalosome, subunit CSN8 / COP9 signalosome complex subunit 4, helix turn helix domain / : / CSN4/RPN5/eIF3a helix turn helix domain / COP9 signalosome complex subunit 3, N-terminal helical repeats / COP9 signalosome subunit 6 / : / COP9 signalosome complex subunit 1, C-terminal helix / Cop9 signalosome subunit 5 C-terminal domain / Cop9 signalosome subunit 5 C-terminal domain / Eukaryotic translation initiation factor 3 subunit M eIF3m/COP9 signalosome complex subunit 7 COPS7 / : / : / : / PSMD12/CSN4, N-terminal / 26S proteasome regulatory subunit Rpn7/COP9 signalosome complex subunit 1 / 26S proteasome regulatory subunit Rpn7, N-terminal / 26S proteasome subunit RPN7 / 26S Proteasome non-ATPase regulatory subunit 12/COP9 signalosome complex subunit 4 / PCI/PINT associated module / CSN8/PSMD8/EIF3K / CSN8/PSMD8/EIF3K family / Rpn11/EIF3F, C-terminal / Maintenance of mitochondrial structure and function / : / motif in proteasome subunits, Int-6, Nip-1 and TRIP-15 / PCI domain / Proteasome component (PCI) domain / PCI domain profile. / JAB1/Mov34/MPN/PAD-1 ubiquitin protease / JAB/MPN domain / JAB1/MPN/MOV34 metalloenzyme domain / MPN domain / MPN domain profile. / Tetratricopeptide-like helical domain superfamily / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
COP9 signalosome complex subunit 2 / COP9 signalosome complex subunit 1 / COP9 signalosome complex subunit 6 / COP9 signalosome complex subunit 9 / COP9 signalosome complex subunit 5 / COP9 signalosome complex subunit 8 / COP9 signalosome complex subunit 4 / COP9 signalosome complex subunit 7b / COP9 signalosome complex subunit 3
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsDing, S. / Clapperton, J.A. / Maeots, M.E. / Enchev, R.I.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
The Francis Crick InstituteCC2059 United Kingdom
CitationJournal: Nat Commun / Year: 2026
Title: Structural basis of CSN-mediated SCF deneddylation.
Authors: Shan Ding / Julie A Clapperton / Märt-Erik Mäeots / Simone Kunzelmann / Mohammed Shaaban / Radoslav I Enchev /
Abstract: Cullin-RING ligases (CRLs) are the largest family of E3 ligases, with ubiquitination activity dynamically regulated by neddylation and deneddylation by the COP9 signalosome (CSN). CSN-mediated ...Cullin-RING ligases (CRLs) are the largest family of E3 ligases, with ubiquitination activity dynamically regulated by neddylation and deneddylation by the COP9 signalosome (CSN). CSN-mediated deneddylation not only deactivates CRLs but also enables substrate receptor exchange. Although CSN is a promising drug target, the structural basis underlying its catalytic mechanism remains unclear. Here, we use cryo-electron microscopy (cryo-EM) to uncover distinct functional states of CSN-CRL (SCF) complexes, capturing key intermediates of the deneddylation cycle. We visualise an autoinhibited docking state and a catalytic intermediate in which CSN5 Ins-1 loop, RBX1 RING and neddylated Cullin WHB domains are repositioned for isopeptide cleavage. We further resolve four dissociation intermediates that define the stepwise release of CSN from its product, with RBX1 RING stabilising key interactions. Additionally, our structures locate CSNAP within a CSN3-CSN8 groove. Together, our study provides a mechanistic model for CSN function and informs the rational design of CSN-targeted therapeutics.
History
DepositionMar 25, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0Feb 4, 2026Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
E: COP9 signalosome complex subunit 5
A: COP9 signalosome complex subunit 1
B: COP9 signalosome complex subunit 2
C: COP9 signalosome complex subunit 3
D: COP9 signalosome complex subunit 4
F: COP9 signalosome complex subunit 6
G: COP9 signalosome complex subunit 7b
H: COP9 signalosome complex subunit 8
P: COP9 signalosome complex subunit 9
hetero molecules


Theoretical massNumber of molelcules
Total (without water)334,46610
Polymers334,4019
Non-polymers651
Water181
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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COP9 signalosome complex subunit ... , 9 types, 9 molecules EABCDFGHP

#1: Protein COP9 signalosome complex subunit 5 / SGN5 / Signalosome subunit 5 / Jun activation domain-binding protein 1


Mass: 37563.707 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS5, CSN5, JAB1 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: Q92905, Hydrolases; Acting on peptide bonds (peptidases)
#2: Protein COP9 signalosome complex subunit 1 / Signalosome subunit 1 / G protein pathway suppressor 1 / GPS-1 / JAB1-containing signalosome ...Signalosome subunit 1 / G protein pathway suppressor 1 / GPS-1 / JAB1-containing signalosome subunit 1 / Protein MFH


Mass: 55606.496 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GPS1, COPS1, CSN1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q13098
#3: Protein COP9 signalosome complex subunit 2 / Signalosome subunit 2 / Alien homolog / JAB1-containing signalosome subunit 2 / Thyroid receptor- ...Signalosome subunit 2 / Alien homolog / JAB1-containing signalosome subunit 2 / Thyroid receptor-interacting protein 15 / TRIP-15


Mass: 51664.570 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS2, CSN2, TRIP15 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P61201
#4: Protein COP9 signalosome complex subunit 3 / SGN3 / Signalosome subunit 3 / JAB1-containing signalosome subunit 3


Mass: 47924.008 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS3, CSN3 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9UNS2
#5: Protein COP9 signalosome complex subunit 4 / SGN4 / Signalosome subunit 4 / JAB1-containing signalosome subunit 4


Mass: 46322.688 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS4, CSN4 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9BT78
#6: Protein COP9 signalosome complex subunit 6 / Signalosome subunit 6 / JAB1-containing signalosome subunit 6 / MOV34 homolog / Vpr-interacting protein / hVIP


Mass: 36203.398 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS6, CSN6, HVIP / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q7L5N1
#7: Protein COP9 signalosome complex subunit 7b / SGN7b / Signalosome subunit 7b / JAB1-containing signalosome subunit 7b


Mass: 29656.928 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS7B, CSN7B / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9H9Q2
#8: Protein COP9 signalosome complex subunit 8 / Signalosome subunit 8 / COP9 homolog / hCOP9 / JAB1-containing signalosome subunit 8


Mass: 23245.543 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS8, CSN8 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q99627
#9: Protein COP9 signalosome complex subunit 9 / CSN acidic protein / CSNAP / Myeloma-overexpressed gene 2 protein


Mass: 6213.689 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS9, MYEOV2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q8WXC6

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Non-polymers , 2 types, 2 molecules

#10: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#11: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestN
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: COP9 signalosome / Type: COMPLEX / Entity ID: #2-#5, #1, #6-#9 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5 / Details: 15 mM Hepes pH 7.5, 120 mM NaCl, 0.5 mM DTT
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 500 nm / Nominal defocus min: 50 nm
Image recordingElectron dose: 47 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1crYOLOparticle selection
2PHENIX1.21.1_5286model refinement
13RELION3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 582407 / Symmetry type: POINT

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