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- PDB-9e5z: Cryo-EM structure of COP9 signalosome -

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Basic information

Entry
Database: PDB / ID: 9e5z
TitleCryo-EM structure of COP9 signalosome
Components(COP9 signalosome complex subunit ...) x 8
KeywordsMETAL BINDING PROTEIN / COP9 / COP9 signalosome / signalosome / deneddylation / CSN5 / metalloprotease / SIGNALING PROTEIN
Function / homology
Function and homology information


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 ...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 / protein neddylation / Hydrolases; Acting on peptide bonds (peptidases) / RHOBTB1 GTPase cycle / metal-dependent deubiquitinase activity / regulation of JNK cascade / 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 / 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 / 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 / cytoplasm / cytosol
Similarity search - Function
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 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 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: 3.4 Å
AuthorsShi, H. / Zheng, N.
Funding support United States, 1items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Nature / Year: 2026
Title: CSN5i-3 is an orthosteric molecular glue inhibitor of COP9 signalosome.
Authors: Huigang Shi / Xiaorong Wang / Clinton Yu / Haibin Mao / Fenglong Jiao / Merav Braitbard / Ben Shor / Zhongsheng Zhang / Thomas R Hinds / Shiyun Cao / Erkang Fan / Dina Schneidman-Duhovny / ...Authors: Huigang Shi / Xiaorong Wang / Clinton Yu / Haibin Mao / Fenglong Jiao / Merav Braitbard / Ben Shor / Zhongsheng Zhang / Thomas R Hinds / Shiyun Cao / Erkang Fan / Dina Schneidman-Duhovny / Lan Huang / Ning Zheng /
Abstract: Orthosteric inhibitors block enzyme active sites and prevent substrates from binding. Enhancing their specificity through substrate dependence seems inherently unlikely, as their mechanism hinges on ...Orthosteric inhibitors block enzyme active sites and prevent substrates from binding. Enhancing their specificity through substrate dependence seems inherently unlikely, as their mechanism hinges on direct competition rather than selective recognition. Here we show that a molecular glue mechanism unexpectedly imparts substrate-dependent potency to CSN5i-3, an orthosteric inhibitor of the COP9 signalosome (CSN). We first confirm that CSN5i-3 inhibits CSN, which catalyses NEDD8 (N8) deconjugation from the cullin-RING ubiquitin ligases, by occupying the active site of its catalytic subunit, CSN5, and directly competing with the iso-peptide bond substrate. Notably, the orthosteric inhibitor binds free CSN with only micromolar affinity, yet achieves nanomolar potency in blocking its deneddylase activity. Cryogenic electron microscopy structures of the enzyme-substrate-inhibitor complex reveal that active site-engaged CSN5i-3 occludes the substrate iso-peptide linkage while simultaneously extending an N8-binding exosite of CSN5, acting as a molecular glue to cement the N8-CSN5 interaction. The cooperativity of this trimolecular CSN5i-3-N8-CSN5 assembly, in turn, sequesters CSN5i-3 at its binding site, conferring high potency to the orthosteric inhibitor despite its low affinity for the free enzyme. Together, our findings highlight the modest affinity requirements of molecule glues for individual target proteins and establish orthosteric molecular glue inhibitors as a new class of substrate-dependent enzyme antagonists.
History
DepositionOct 28, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 3, 2025Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

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


Theoretical massNumber of molelcules
Total (without water)329,1069
Polymers329,0408
Non-polymers651
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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COP9 signalosome complex subunit ... , 8 types, 8 molecules ABCDEFGH

#1: Protein COP9 signalosome complex subunit 1 / SGN1 / Signalosome subunit 1 / G protein pathway suppressor 1 / GPS-1 / JAB1-containing signalosome ...SGN1 / 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: Escherichia coli (E. coli) / References: UniProt: Q13098
#2: Protein COP9 signalosome complex subunit 2 / SGN2 / Signalosome subunit 2 / Alien homolog / JAB1-containing signalosome subunit 2 / Thyroid ...SGN2 / Signalosome subunit 2 / Alien homolog / JAB1-containing signalosome subunit 2 / Thyroid receptor-interacting protein 15 / TR-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: Escherichia coli (E. coli) / References: UniProt: P61201
#3: 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: Escherichia coli (E. coli) / References: UniProt: Q9UNS2
#4: 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: Escherichia coli (E. coli) / References: UniProt: Q9BT78
#5: Protein COP9 signalosome complex subunit 5 / SGN5 / Signalosome subunit 5 / Jun activation domain-binding protein 1


Mass: 38416.590 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)
#6: Protein COP9 signalosome complex subunit 6 / SGN6 / Signalosome subunit 6 / JAB1-containing signalosome subunit 6 / MOV34 homolog / Vpr- ...SGN6 / 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: Escherichia coli (E. coli) / 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: Escherichia coli (E. coli) / References: UniProt: Q9H9Q2
#8: Protein COP9 signalosome complex subunit 8 / SGN8 / 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: Escherichia coli (E. coli) / References: UniProt: Q99627

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Non-polymers , 1 types, 1 molecules

#9: 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: The COP9 signalosome deneddylation complex with cullin1
Type: COMPLEX / Entity ID: #7, #1-#6, #8 / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: BL21
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 %

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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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 800 nm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM software
IDNameCategory
7UCSF Chimeramodel fitting
9cryoSPARCinitial Euler assignment
12cryoSPARC3D reconstruction
13PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 312821 / Algorithm: BACK PROJECTION / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingPDB-ID: 4D10

4d10


Accession code: 4D10 / Source name: PDB / Type: experimental model

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