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- PDB-9ouk: DDB1-CRBN with Ikaros(ZF2) and DEG-47: composite map and model su... -

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Basic information

Entry
Database: PDB / ID: 9ouk
TitleDDB1-CRBN with Ikaros(ZF2) and DEG-47: composite map and model submission
Components
  • DNA damage-binding protein 1
  • DNA-binding protein Ikaros
  • Protein cereblon
KeywordsLIGASE / E3 ligases / Cullin RING Ligase / CRL4 / Cereblon / CRBN / molecular glues / IMiDs / Ikaros
Function / homology
Function and homology information


lymphocyte differentiation / negative regulation of monoatomic ion transmembrane transport / positive regulation by virus of viral protein levels in host cell / spindle assembly involved in female meiosis / epigenetic programming in the zygotic pronuclei / UV-damage excision repair / NOTCH3 Intracellular Domain Regulates Transcription / biological process involved in interaction with symbiont / WD40-repeat domain binding / regulation of mitotic cell cycle phase transition ...lymphocyte differentiation / negative regulation of monoatomic ion transmembrane transport / positive regulation by virus of viral protein levels in host cell / spindle assembly involved in female meiosis / epigenetic programming in the zygotic pronuclei / UV-damage excision repair / NOTCH3 Intracellular Domain Regulates Transcription / biological process involved in interaction with symbiont / WD40-repeat domain binding / regulation of mitotic cell cycle phase transition / limb development / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Cul4B-RING E3 ubiquitin ligase complex / mesoderm development / ubiquitin ligase complex scaffold activity / negative regulation of reproductive process / negative regulation of developmental process / locomotory exploration behavior / viral release from host cell / cullin family protein binding / ectopic germ cell programmed cell death / positive regulation of Wnt signaling pathway / pericentric heterochromatin / positive regulation of viral genome replication / negative regulation of protein-containing complex assembly / proteasomal protein catabolic process / sperm end piece / positive regulation of gluconeogenesis / sperm principal piece / erythrocyte differentiation / nucleotide-excision repair / positive regulation of protein-containing complex assembly / Recognition of DNA damage by PCNA-containing replication complex / regulation of circadian rhythm / DNA Damage Recognition in GG-NER / Dual Incision in GG-NER / Transcription-Coupled Nucleotide Excision Repair (TC-NER) / Formation of TC-NER Pre-Incision Complex / Wnt signaling pathway / Formation of Incision Complex in GG-NER / Dual incision in TC-NER / Gap-filling DNA repair synthesis and ligation in TC-NER / positive regulation of protein catabolic process / cellular response to UV / sperm midpiece / rhythmic process / site of double-strand break / Neddylation / chromatin organization / protein-macromolecule adaptor activity / ubiquitin-dependent protein catabolic process / Potential therapeutics for SARS / proteasome-mediated ubiquitin-dependent protein catabolic process / damaged DNA binding / transmembrane transporter binding / chromosome, telomeric region / protein ubiquitination / RNA polymerase II cis-regulatory region sequence-specific DNA binding / DNA-binding transcription factor activity / protein domain specific binding / DNA repair / negative regulation of DNA-templated transcription / apoptotic process / DNA damage response / regulation of transcription by RNA polymerase II / negative regulation of apoptotic process / protein-containing complex binding / nucleolus / perinuclear region of cytoplasm / protein-containing complex / extracellular space / DNA binding / extracellular exosome / zinc ion binding / nucleoplasm / metal ion binding / identical protein binding / membrane / nucleus / cytoplasm / cytosol
Similarity search - Function
: / Yippee/Mis18/Cereblon / Yippee zinc-binding/DNA-binding /Mis18, centromere assembly / CULT domain / CULT domain profile. / Lon N-terminal domain profile. / Lon protease, N-terminal domain / Lon protease, N-terminal domain superfamily / ATP-dependent protease La (LON) substrate-binding domain / Found in ATP-dependent protease La (LON) ...: / Yippee/Mis18/Cereblon / Yippee zinc-binding/DNA-binding /Mis18, centromere assembly / CULT domain / CULT domain profile. / Lon N-terminal domain profile. / Lon protease, N-terminal domain / Lon protease, N-terminal domain superfamily / ATP-dependent protease La (LON) substrate-binding domain / Found in ATP-dependent protease La (LON) / : / RSE1/DDB1/CPSF1 second beta-propeller / Cleavage/polyadenylation specificity factor, A subunit, C-terminal / Cleavage/polyadenylation specificity factor, A subunit, N-terminal / : / CPSF A subunit region / RSE1/DDB1/CPSF1 first beta-propeller / PUA-like superfamily / Zinc finger, C2H2 type / zinc finger / Zinc finger C2H2 type domain profile. / Zinc finger C2H2 superfamily / Zinc finger C2H2 type domain signature. / Zinc finger C2H2-type / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
: / DNA-binding protein Ikaros / DNA damage-binding protein 1 / Protein cereblon
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.69 Å
AuthorsRizvi, Z. / Lander, G.C.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM143805 United States
CitationJournal: Nature / Year: 2026
Title: Identification of an allosteric site on the E3 ligase adapter cereblon.
Authors: Vanessa N Dippon / Zeba Rizvi / Anthony E Choudhry / Chun-Wa Chung / Ibrahim F Alkuraya / Wenqing Xu / Xavier B Tao / Anthony J Jurewicz / Jessica L Schneck / Wenqian Chen / Nicole M Curnutt ...Authors: Vanessa N Dippon / Zeba Rizvi / Anthony E Choudhry / Chun-Wa Chung / Ibrahim F Alkuraya / Wenqing Xu / Xavier B Tao / Anthony J Jurewicz / Jessica L Schneck / Wenqian Chen / Nicole M Curnutt / Farah Kabir / Kwok-Ho Chan / Markus A Queisser / Caterina Musetti / Han Dai / Gabriel C Lander / Andrew B Benowitz / Christina M Woo /
Abstract: Cereblon (CRBN) is the target of thalidomide derivatives that achieve therapeutic efficacy against some haematologic neoplasias by recruiting neosubstrates for degradation. Despite the intense ...Cereblon (CRBN) is the target of thalidomide derivatives that achieve therapeutic efficacy against some haematologic neoplasias by recruiting neosubstrates for degradation. Despite the intense investigation of orthosteric thalidomide derivatives, little is known about alternate binding sites on CRBN. Here we report an evolutionarily conserved cryptic allosteric binding site on CRBN. Small-molecule SB-405483 binds the allosteric site to cooperatively enhance the binding of orthosteric ligands and alter their neosubstrate degradation profiles. A survey of over 100 orthosteric ligands and their degradation targets reveals trends in the classes of compounds and neosubstrates in which degradation outcomes are enhanced or inhibited by SB-405483. Structural investigations provide a mechanistic basis for the effects of the allosteric ligand by shifting the conformational distribution of CRBN to a novel CRBN and increasing the CRBN state. The discovery of a cryptic allosteric binding site on CRBN that alters the functional effects of orthosteric ligands opens new directions with broad implications for improving the selectivity and efficacy of CRBN therapeutics.
History
DepositionMay 28, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 3, 2025Provider: repository / Type: Initial release
Revision 1.0Dec 3, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Dec 3, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Dec 3, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Dec 24, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
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Revision 1.1Dec 24, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / EM metadata / Category: citation / citation_author / em_admin
Data content type: EM metadata / EM metadata ...EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata
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Revision 1.2Feb 4, 2026Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / EM metadata / Category: citation / citation_author / em_admin
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: DNA damage-binding protein 1
B: Protein cereblon
C: DNA-binding protein Ikaros
hetero molecules


Theoretical massNumber of molelcules
Total (without water)152,9876
Polymers152,4933
Non-polymers4943
Water00
1


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

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Components

#1: Protein DNA damage-binding protein 1 / DDB p127 subunit / DNA damage-binding protein a / DDBa / Damage-specific DNA-binding protein 1 / ...DDB p127 subunit / DNA damage-binding protein a / DDBa / Damage-specific DNA-binding protein 1 / HBV X-associated protein 1 / XAP-1 / UV-damaged DNA-binding factor / UV-damaged DNA-binding protein 1 / UV-DDB 1 / XPE-binding factor / XPE-BF / Xeroderma pigmentosum group E-complementing protein / XPCe


Mass: 94389.234 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: The BPB domain is truncated (396-705 truncation with addition of a GNGNSG linker between BPA and BPC) from DDB1 and co-expressed with Cereblon (CRBN) in SF9 expression system,
Source: (gene. exp.) Homo sapiens (human) / Gene: DDB1, XAP1 / Plasmid: pFASTBac / Cell line (production host): Sf9
Production host: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
References: UniProt: Q16531
#2: Protein Protein cereblon


Mass: 51563.758 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CRBN, AD-006 / Plasmid: pFASTBac / Cell line (production host): Sf9
Production host: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
References: UniProt: Q96SW2
#3: Protein DNA-binding protein Ikaros / Ikaros family zinc finger protein 1 / Lymphoid transcription factor LyF-1


Mass: 6539.526 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: IKZF1, IK1, IKAROS, LYF1, ZNFN1A1 / Plasmid: pet28A / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): Rosetta / References: UniProt: Q13422
#4: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Zn
#5: Chemical ChemComp-A1CEK / N-{2-[(3S)-2,6-dioxopiperidin-3-yl]-1-oxo-2,3-dihydro-1H-isoindol-5-yl}benzamide


Mass: 363.367 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C20H17N3O4 / Feature type: SUBJECT OF INVESTIGATION
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: DDB1(BPB deleted)-CRBN complex with ikaros ZF2-3 and DEG-47 was incubauted for 30 minutes and then plunge frozen over 1.2/1.3 UltrAufoil
Type: COMPLEX / Entity ID: #1-#3 / Source: MULTIPLE SOURCES
Molecular weightValue: 0.15127264 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
Strain: sf9 / Cell: insect cell / Plasmid: pFASTBac
Buffer solutionpH: 7 / Details: 10mM HEPES, 240mM NaCl, 3mM TCEP
Buffer component
IDConc.NameFormulaBuffer-ID
110 mMHEPESC8H18N2O4S1
2240 mMSodium ChlorideNaCl1
33 mMTCEPC9H15O6P1
SpecimenConc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: The protein complex with ikaros ZF2-3 was incubated with IMiD DEG-47 and was incubated at 1:2:13 for 30 minutes and then frozen on 1.2/1.3 Au grids
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: HOMEMADE PLUNGER / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 19000 X / Calibrated magnification: 189189 X / Nominal defocus max: 1200 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 77 K / Temperature (min): 70 K
Image recordingAverage exposure time: 4.08 sec. / Electron dose: 50 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 4915
Image scansSampling size: 14 µm / Width: 4096 / Height: 4096

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.6.2particle selection
2EPU3.9.1.8206image acquisition
4cryoSPARC4.6.2CTF correction
7Coot0.9.8.95 EL (ccp4)model fitting
9cryoSPARC4.6.2initial Euler assignment
10cryoSPARC4.6.2final Euler assignment
11cryoSPARC4.6.2classification
12cryoSPARC4.6.23D reconstruction
13PHENIXv2.0orc1-5617model refinement
CTF correctionType: PHASE FLIPPING ONLY
Particle selectionNum. of particles selected: 3488921
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.69 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 412326 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingB value: 97.8 / Protocol: RIGID BODY FIT / Space: RECIPROCAL
Atomic model building

3D fitting-ID: 1 / Accession code: 8d7z / Initial refinement model-ID: 1 / PDB-ID: 8d7z

8d7z

/ Source name: PDB / Type: experimental model

IDPdb chain-IDChain-IDChain residue rangeDetailsPdb chain residue range
1AA1-1148396-705 residues are truncated in construct as well as structure sequence.1-1148
2BB46-4271-46 residues are not observed in EM density46-427
3CC144-169140-144 and 170-196 residues are not observed in the EM density but they were in construct.144-169
RefinementHighest resolution: 2.69 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0029830
ELECTRON MICROSCOPYf_angle_d0.57113297
ELECTRON MICROSCOPYf_dihedral_angle_d7.4091324
ELECTRON MICROSCOPYf_chiral_restr0.0431495
ELECTRON MICROSCOPYf_plane_restr0.0041704

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