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Open data
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Basic information
| Entry | Database: PDB / ID: 9efv | |||||||||||||||
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| Title | Cryo-EM structure of CSN-N8CUL1 in complex with CSN5i-3 | |||||||||||||||
Components |
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Keywords | SIGNALING PROTEIN / COP9 / COP9 signalosome / signalosome / deneddylation / N8CUL1 / CSN5i-3 / othosteric molecular glue | |||||||||||||||
| Function / homology | Function and homology informationCOP9 signalosome assembly / macrophage migration inhibitory factor binding / regulation of IRE1-mediated unfolded protein response / regulation of DNA damage response, signal transduction by p53 class mediator / Parkin-FBXW7-Cul1 ubiquitin ligase complex / exosomal secretion / GTPase inhibitor activity / deNEDDylase activity / activation of NF-kappaB-inducing kinase activity / protein deneddylation ...COP9 signalosome assembly / macrophage migration inhibitory factor binding / regulation of IRE1-mediated unfolded protein response / regulation of DNA damage response, signal transduction by p53 class mediator / Parkin-FBXW7-Cul1 ubiquitin ligase complex / exosomal secretion / GTPase inhibitor activity / deNEDDylase activity / activation of NF-kappaB-inducing kinase activity / protein deneddylation / regulation of protein neddylation / eukaryotic translation initiation factor 3 complex / cellular response to camptothecin / negative regulation of beige fat cell differentiation / COP9 signalosome / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / deubiquitinase activity / cullin-RING ubiquitin ligase complex / negative regulation of mitophagy / regulation of xenophagy / cellular response to chemical stress / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / Cul7-RING ubiquitin ligase complex / regulation of cell cycle process / neural crest cell differentiation / RNA polymerase II transcription initiation surveillance / positive regulation of protein autoubiquitination / protein neddylation / regulation of BMP signaling pathway / regulation of JNK cascade / NEDD8 ligase activity / regulation of mitophagy / Hydrolases; Acting on peptide bonds (peptidases) / negative regulation of response to oxidative stress / regulation of centrosome duplication / RHOBTB1 GTPase cycle / protein K27-linked ubiquitination / positive regulation of cilium assembly / Cul5-RING ubiquitin ligase complex / metal-dependent deubiquitinase activity / ubiquitin-ubiquitin ligase activity / regulation of TOR signaling / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / intercellular bridge / Cul2-RING ubiquitin ligase complex / negative regulation of DNA-templated DNA replication / SCF ubiquitin ligase complex / regulation of DNA damage checkpoint / regulation of mitotic cytokinesis / negative regulation of type I interferon production / Cul3-RING ubiquitin ligase complex / regulation of miRNA-mediated gene silencing / regulation of natural killer cell activation / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / Prolactin receptor signaling / nucleotide-excision repair complex / regulation of cell cycle phase transition / Cul4-RING E3 ubiquitin ligase complex / regulation of stem cell population maintenance / Cul4A-RING E3 ubiquitin ligase complex / TGF-beta receptor signaling activates SMADs / ubiquitin ligase complex scaffold activity / negative regulation of adipose tissue development / response to light stimulus / regulation of proteolysis / Cul4B-RING E3 ubiquitin ligase complex / regulation of cellular response to stress / limb development / regulation of postsynapse assembly / positive regulation of keratinocyte differentiation / protein monoubiquitination / JNK cascade / anatomical structure morphogenesis / cullin family protein binding / centrosome duplication / regulation of DNA-templated DNA replication initiation / cilium assembly / intrinsic apoptotic signaling pathway / ribosome-associated ubiquitin-dependent protein catabolic process / signal transduction in response to DNA damage / negative regulation of insulin receptor signaling pathway / protein K63-linked ubiquitination / Nuclear events stimulated by ALK signaling in cancer / regulation of cellular response to insulin stimulus / protein K48-linked ubiquitination / translation initiation factor activity / transcription-coupled nucleotide-excision repair / post-translational protein modification / positive regulation of TORC1 signaling / regulation of embryonic development / replication fork processing / cellular response to amino acid stimulus / protein modification process / regulation of mitotic cell cycle / negative regulation of canonical NF-kappaB signal transduction / site of DNA damage / negative regulation of canonical Wnt signaling pathway / Regulation of BACH1 activity / T cell activation Similarity search - Function | |||||||||||||||
| Biological species | Homo sapiens (human) | |||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.03 Å | |||||||||||||||
Authors | Shi, H. / Zheng, N. | |||||||||||||||
| Funding support | United States, 1items
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Citation | Journal: Nature / Year: 2026Title: 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. | |||||||||||||||
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Structure visualization
| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 9efv.cif.gz | 572.4 KB | Display | PDBx/mmCIF format |
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| PDB format | pdb9efv.ent.gz | 456 KB | Display | PDB format |
| PDBx/mmJSON format | 9efv.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/ef/9efv ftp://data.pdbj.org/pub/pdb/validation_reports/ef/9efv | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 47981MC ![]() 9e5zC ![]() 9e77C ![]() 9e81C ![]() 9efmC ![]() 9efqC ![]() 9eg1C ![]() 9eg8C ![]() 9eglC ![]() 9ph4C M: map data used to model this data C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
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Assembly
| Deposited unit | ![]()
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Components
-COP9 signalosome complex subunit ... , 8 types, 8 molecules ABCDEFGH
| #1: Protein | 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: ![]() |
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| #2: Protein | 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: ![]() |
| #3: Protein | 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: ![]() |
| #4: Protein | 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: ![]() |
| #5: Protein | Mass: 37621.742 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: ![]() References: UniProt: Q92905, Hydrolases; Acting on peptide bonds (peptidases) |
| #6: Protein | 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: ![]() |
| #7: Protein | 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: ![]() |
| #8: Protein | 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: ![]() |
-Protein , 3 types, 3 molecules IJK
| #9: Protein | Mass: 9086.562 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: NEDD8 / Production host: ![]() |
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| #10: Protein | Mass: 89800.367 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: CUL1 / Production host: ![]() |
| #11: Protein | Mass: 12289.977 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: RBX1, RNF75, ROC1 / Production host: ![]() References: UniProt: P62877, RING-type E3 ubiquitin transferase, cullin-RING-type E3 NEDD8 transferase |
-Non-polymers , 2 types, 5 molecules 


| #12: Chemical | ChemComp-6LT / |
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| #13: Chemical | ChemComp-ZN / |
-Details
| Has ligand of interest | Y |
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| Has protein modification | N |
-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
| Component | Name: The COP9 signalosome complex neddylated cullin-1 with CSN5i-3 Type: COMPLEX / Entity ID: #1-#11 / Source: MULTIPLE SOURCES |
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| Source (natural) | Organism: Homo sapiens (human) |
| Source (recombinant) | Organism: ![]() |
| Buffer solution | pH: 7.5 |
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
| Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3 |
| Vitrification | Instrument: 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 |
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| Microscopy | Model: TFS KRIOS |
| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 800 nm / Alignment procedure: COMA FREE |
| Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
| Image recording | Electron dose: 60 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||
| Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||
| 3D reconstruction | Resolution: 3.03 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 174577 / Algorithm: FOURIER SPACE / Symmetry type: POINT |
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Homo sapiens (human)
United States, 1items
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