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- PDB-9efm: Cryo-EM structure of COP9 signalosome precatalytic state with ned... -

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Entry
Database: PDB / ID: 9efm
TitleCryo-EM structure of COP9 signalosome precatalytic state with neddylated cullin-1
Components
  • (COP9 signalosome complex subunit ...) x 8
  • Cullin-1
  • E3 ubiquitin-protein ligase RBX1
  • NEDD8
KeywordsSIGNALING PROTEIN / COP9 / COP9 signalosome / signalosome / deneddylation / CSN5 / N8CUL1 / CSN
Function / homology
Function and homology information


COP9 signalosome assembly / trophectodermal cell proliferation / macrophage migration inhibitory factor binding / regulation of IRE1-mediated unfolded protein response / Parkin-FBXW7-Cul1 ubiquitin ligase complex / exosomal secretion / GTPase inhibitor activity / deNEDDylase activity / protein deneddylation / regulation of protein neddylation ...COP9 signalosome assembly / trophectodermal cell proliferation / macrophage migration inhibitory factor binding / regulation of IRE1-mediated unfolded protein response / Parkin-FBXW7-Cul1 ubiquitin ligase complex / 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 / negative regulation of beige fat cell differentiation / cellular response to camptothecin / COP9 signalosome / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / cullin-RING ubiquitin ligase complex / Cul7-RING ubiquitin ligase complex / cellular response to chemical stress / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / positive regulation of protein autoubiquitination / RNA polymerase II transcription initiation surveillance / protein neddylation / Hydrolases; Acting on peptide bonds (peptidases) / NEDD8 ligase activity / protein K27-linked ubiquitination / RHOBTB1 GTPase cycle / regulation of JNK cascade / negative regulation of response to oxidative stress / regulation of DNA damage response, signal transduction by p53 class mediator / VCB complex / inner cell mass cell proliferation / Cul5-RING ubiquitin ligase complex / metal-dependent deubiquitinase activity / ubiquitin-ubiquitin ligase activity / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / SCF ubiquitin ligase complex / Cul2-RING ubiquitin ligase complex / Cul3-RING ubiquitin ligase complex / negative regulation of type I interferon production / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Prolactin receptor signaling / negative regulation of mitophagy / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / TGF-beta receptor signaling activates SMADs / regulation of proteolysis / : / regulation of postsynapse assembly / skeletal muscle cell differentiation / response to light stimulus / cullin family protein binding / anatomical structure morphogenesis / protein monoubiquitination / site of DNA damage / JNK cascade / signal transduction in response to DNA damage / Nuclear events stimulated by ALK signaling in cancer / protein K48-linked ubiquitination / transcription-coupled nucleotide-excision repair / translation initiation factor activity / negative regulation of insulin receptor signaling pathway / regulation of cellular response to insulin stimulus / positive regulation of TORC1 signaling / post-translational protein modification / intrinsic apoptotic signaling pathway / animal organ morphogenesis / T cell activation / protein modification process / Regulation of BACH1 activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / negative regulation of canonical NF-kappaB signal transduction / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / cellular response to amino acid stimulus / Dectin-1 mediated noncanonical NF-kB signaling / Degradation of DVL / Degradation of CRY and PER proteins / G1/S transition of mitotic cell cycle / negative regulation of canonical Wnt signaling pathway / Activation of NF-kappaB in B cells / Iron uptake and transport / Degradation of GLI1 by the proteasome / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Recognition of DNA damage by PCNA-containing replication complex / Negative regulation of NOTCH4 signaling / RING-type E3 ubiquitin transferase / Hedgehog 'on' state / Vif-mediated degradation of APOBEC3G / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / Ubiquitin-Mediated Degradation of Phosphorylated Cdc25A / modification-dependent protein catabolic process / Degradation of beta-catenin by the destruction complex / NOTCH1 Intracellular Domain Regulates Transcription / Evasion by RSV of host interferon responses
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 complex subunit 2, C-terminal helix / Cop9 signalosome subunit 5 C-terminal domain / Cop9 signalosome subunit 5 C-terminal domain / Nedd8-like ubiquitin / Eukaryotic translation initiation factor 3 subunit M eIF3m/COP9 signalosome complex subunit 7 COPS7 / Zinc finger, RING-H2-type / RING-H2 zinc finger domain / Cullin, N-terminal / Cullin protein neddylation domain / : / Cullin, conserved site / Cullin alpha solenoid domain / Cullin family signature. / Cullin repeat-like-containing domain superfamily / Cullin protein, neddylation domain / Cullin / Cullin protein neddylation domain / Cullin / : / : / : / 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 / : / Cullin alpha+beta domain / Cullin homology domain / Cullin homology domain superfamily / Cullin family profile. / 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. / Zinc finger RING-type profile. / Zinc finger, RING-type / : / Ubiquitin domain signature. / Ubiquitin conserved site / Ubiquitin domain / Ubiquitin family / Tetratricopeptide-like helical domain superfamily / Ubiquitin homologues / Ubiquitin domain profile. / Ubiquitin-like domain / Zinc finger, RING/FYVE/PHD-type / Ubiquitin-like domain superfamily / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
COP9 signalosome complex subunit 2 / E3 ubiquitin-protein ligase RBX1 / COP9 signalosome complex subunit 1 / Cullin-1 / Ubiquitin-like protein NEDD8 / 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: 3.16 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
DepositionNov 20, 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
I: NEDD8
J: Cullin-1
K: E3 ubiquitin-protein ligase RBX1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)439,55914
Polymers439,36311
Non-polymers1963
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: 37562.719 Da / Num. of mol.: 1 / Mutation: E76A , D151N
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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Protein , 3 types, 3 molecules IJK

#9: Protein NEDD8 / Neddylin / Neural precursor cell expressed developmentally down-regulated protein 8 / NEDD-8 / ...Neddylin / Neural precursor cell expressed developmentally down-regulated protein 8 / NEDD-8 / Ubiquitin-like protein Nedd8


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: Escherichia coli (E. coli) / References: UniProt: Q15843
#10: Protein Cullin-1 / CUL-1


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: Escherichia coli (E. coli) / References: UniProt: Q13616
#11: Protein E3 ubiquitin-protein ligase RBX1 / E3 ubiquitin-protein transferase RBX1 / Protein ZYP / RING finger protein 75 / RING-box protein 1 / ...E3 ubiquitin-protein transferase RBX1 / Protein ZYP / RING finger protein 75 / RING-box protein 1 / Rbx1 / Regulator of cullins 1 / ROC1


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: Escherichia coli (E. coli)
References: UniProt: P62877, RING-type E3 ubiquitin transferase, cullin-RING-type E3 NEDD8 transferase

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Non-polymers , 1 types, 3 molecules

#12: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 3 / 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 neddylated cullin-1
Type: COMPLEX / Entity ID: #1-#11 / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
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
2SerialEMimage acquisition
7UCSF Chimeramodel fitting
9PHENIXmodel refinement
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.16 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 177066 / Algorithm: FOURIER SPACE / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
11LDJ

1ldj

11LDJ1PDBexperimental model
24D10

4d10

14D102PDBexperimental model

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