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- EMDB-70867: DDB1-CRBN with Ikaros(ZF2) and DEG-47: composite map and model su... -

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Basic information

Entry
Database: EMDB / ID: EMD-70867
TitleDDB1-CRBN with Ikaros(ZF2) and DEG-47: composite map and model submission
Map data
Sample
  • Complex: 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
    • Protein or peptide: DNA damage-binding protein 1
    • Protein or peptide: Protein cereblon
    • Protein or peptide: DNA-binding protein Ikaros
  • Ligand: ZINC ION
  • Ligand: N-{2-[(3S)-2,6-dioxopiperidin-3-yl]-1-oxo-2,3-dihydro-1H-isoindol-5-yl}benzamide
KeywordsE3 ligases / Cullin RING Ligase / CRL4 / Cereblon / CRBN / molecular glues / IMiDs / LIGASE / 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)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.69 Å
AuthorsRizvi Z / Lander GC
Funding support United States, 1 items
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, 2025-
Header (metadata) releaseDec 3, 2025-
Map releaseDec 3, 2025-
UpdateFeb 4, 2026-
Current statusFeb 4, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_70867.png

Downloads & links

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Map

FileDownload / File: emd_70867.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.74 Å/pix.
x 300 pix.
= 222. Å		0.74 Å/pix.
x 300 pix.
= 222. Å		0.74 Å/pix.
x 300 pix.
= 222. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.74 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0513
Minimum - Maximum-0.13326164 - 0.4876186
Average (Standard dev.)0.0007946686 (±0.011517414)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 222.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : DDB1(BPB deleted)-CRBN complex with ikaros ZF2-3 and DEG-47 was i...

EntireName: 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
Components
  • Complex: 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
    • Protein or peptide: DNA damage-binding protein 1
    • Protein or peptide: Protein cereblon
    • Protein or peptide: DNA-binding protein Ikaros
  • Ligand: ZINC ION
  • Ligand: N-{2-[(3S)-2,6-dioxopiperidin-3-yl]-1-oxo-2,3-dihydro-1H-isoindol-5-yl}benzamide

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Supramolecule #1: DDB1(BPB deleted)-CRBN complex with ikaros ZF2-3 and DEG-47 was i...

SupramoleculeName: 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 / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 151.27264 KDa

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Macromolecule #1: DNA damage-binding protein 1

MacromoleculeName: DNA damage-binding protein 1 / type: protein_or_peptide / ID: 1
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,
Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 94.389234 KDa
Recombinant expressionOrganism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
SequenceString: MSYNYVVTAQ KPTAVNGCVT GHFTSAEDLN LLIAKNTRLE IYVVTAEGLR PVKEVGMYGK IAVMELFRPK GESKDLLFIL TAKYNACIL EYKQSGESID IITRAHGNVQ DRIGRPSETG IIGIIDPECR MIGLRLYDGL FKVIPLDRDN KELKAFNIRL E ELHVIDVK ...String:
MSYNYVVTAQ KPTAVNGCVT GHFTSAEDLN LLIAKNTRLE IYVVTAEGLR PVKEVGMYGK IAVMELFRPK GESKDLLFIL TAKYNACIL EYKQSGESID IITRAHGNVQ DRIGRPSETG IIGIIDPECR MIGLRLYDGL FKVIPLDRDN KELKAFNIRL E ELHVIDVK FLYGCQAPTI CFVYQDPQGR HVKTYEVSLR EKEFNKGPWK QENVEAEASM VIAVPEPFGG AIIIGQESIT YH NGDKYLA IAPPIIKQST IVCHNRVDPN GSRYLLGDME GRLFMLLLEK EEQMDGTVTL KDLRVELLGE TSIAECLTYL DNG VVFVGS RLGDSQLVKL NVDSNEQGSY VVAMETFTNL GPIVDMCVVD LERQGQGQLV TCSGAFKEGS LRIIRNGIGG NGNS GEIQK LHIRTVPLYE SPRKICYQEV SQCFGVLSSR IEVQDTSGGT TALRPSASTQ ALSSSVSSSK LFSSSTAPHE TSFGE EVEV HNLLIIDQHT FEVLHAHQFL QNEYALSLVS CKLGKDPNTY FIVGTAMVYP EEAEPKQGRI VVFQYSDGKL QTVAEK EVK GAVYSMVEFN GKLLASINST VRLYEWTTEK ELRTECNHYN NIMALYLKTK GDFILVGDLM RSVLLLAYKP MEGNFEE IA RDFNPNWMSA VEILDDDNFL GAENAFNLFV CQKDSAATTD EERQHLQEVG LFHLGEFVNV FCHGSLVMQN LGETSTPT Q GSVLFGTVNG MIGLVTSLSE SWYNLLLDMQ NRLNKVIKSV GKIEHSFWRS FHTERKTEPA TGFIDGDLIE SFLDISRPK MQEVVANLQY DDGSGMKREA TADDLIKVVE ELTRIHWSHP QFEK

UniProtKB: DNA damage-binding protein 1, DNA damage-binding protein 1

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Macromolecule #2: Protein cereblon

MacromoleculeName: Protein cereblon / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 51.563758 KDa
Recombinant expressionOrganism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
SequenceString: MHHHHHHMAG EGDQQDAAHN MGNHLPLLPA ESEEEDEMEV EDQDSKEAKK PNIINFDTSL PTSHTYLGAD MEEFHGRTLH DDDSCQVIP VLPQVMMILI PGQTLPLQLF HPQEVSMVRN LIQKDRTFAV LAYSNVQERE AQFGTTAEIY AYREEQDFGI E IVKVKAIG ...String:
MHHHHHHMAG EGDQQDAAHN MGNHLPLLPA ESEEEDEMEV EDQDSKEAKK PNIINFDTSL PTSHTYLGAD MEEFHGRTLH DDDSCQVIP VLPQVMMILI PGQTLPLQLF HPQEVSMVRN LIQKDRTFAV LAYSNVQERE AQFGTTAEIY AYREEQDFGI E IVKVKAIG RQRFKVLELR TQSDGIQQAK VQILPECVLP STMSAVQLES LNKCQIFPSK PVSREDQCSY KWWQKYQKRK FH CANLTSW PRWLYSLYDA ETLMDRIKKQ LREWDENLKD DSLPSNPIDF SYRVAACLPI DDVLRIQLLK IGSAIQRLRC ELD IMNKCT SLCCKQCQET EITTKNEIFS LSLCGPMAAY VNPHGYVHET LTVYKACNLN LIGRPSTEHS WFPGYAWTVA QCKI CASHI GWKFTATKKD MSPQKFWGLT RSALLPTIPD TEDEISPDKV ILCL

UniProtKB: Protein cereblon

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Macromolecule #3: DNA-binding protein Ikaros

MacromoleculeName: DNA-binding protein Ikaros / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 6.539526 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
TGERPFQCNQ CGASFTQKGN LLRHIKLHSG EKPFKCHLCN YACRRRDALT GHLRTHS

UniProtKB: DNA-binding protein Ikaros

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Macromolecule #4: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 4 / Number of copies: 2 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Macromolecule #5: N-{2-[(3S)-2,6-dioxopiperidin-3-yl]-1-oxo-2,3-dihydro-1H-isoindol...

MacromoleculeName: N-{2-[(3S)-2,6-dioxopiperidin-3-yl]-1-oxo-2,3-dihydro-1H-isoindol-5-yl}benzamide
type: ligand / ID: 5 / Number of copies: 1 / Formula: A1CEK
Molecular weightTheoretical: 363.367 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.5 mg/mL
BufferpH: 7
Component:
ConcentrationFormulaName
10.0 mMC8H18N2O4SHEPES
240.0 mMNaClSodium Chloride
3.0 mMC9H15O6PTCEP

Details: 10mM HEPES, 240mM NaCl, 3mM TCEP
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY / Support film - Film thickness: 100.1 / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 12 sec. / Pretreatment - Atmosphere: OTHER / Pretreatment - Pressure: 0.0239980266 kPa
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277.15 K / Instrument: HOMEMADE PLUNGER
DetailsThe 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

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
TemperatureMin: 70.0 K / Max: 77.0 K
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number grids imaged: 1 / Number real images: 4915 / Average exposure time: 4.08 sec. / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Calibrated magnification: 189189 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.2 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 19000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 3488921
CTF correctionSoftware - Name: cryoSPARC (ver. 4.6.2) / Type: PHASE FLIPPING ONLY
Startup modelType of model: INSILICO MODEL / In silico model: AB INITIO RECONSTRUCTION
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 2.69 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.6.2) / Number images used: 412326
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.6.2)
Details: Ab initio reconstruction, heterogeneous refinement, and homogeneous refinement
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.6.2) / Details: Non-uniform refinement
Final 3D classificationNumber classes: 6 / Software - Name: cryoSPARC (ver. 4.6.2)

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Atomic model buiding 1

Initial model
PDB IDChainDetails

8d7z

chain_id: A, residue_range: 1-1148, source_name: PDB, initial_model_type: experimental model396-705 residues are truncated in construct as well as structure sequence.

8d7z

chain_id: B, residue_range: 46-427, source_name: PDB, initial_model_type: experimental model1-46 residues are not observed in EM density

8d7z

chain_id: C, residue_range: 144-169, source_name: PDB, initial_model_type: experimental model140-144 and 170-196 residues are not observed in the EM density but they were in construct.
RefinementSpace: RECIPROCAL / Protocol: RIGID BODY FIT / Overall B value: 97.8
Output model

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

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