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- PDB-9os2: Cryo-EM structure of the DDB1/CRBN-MRT-5702-G3BP2 ternary complex -

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Basic information

Entry
Database: PDB / ID: 9os2
TitleCryo-EM structure of the DDB1/CRBN-MRT-5702-G3BP2 ternary complex
Components
  • DNA damage-binding protein 1
  • Protein cereblon
  • Ras GTPase-activating protein-binding protein 2
KeywordsLIGASE / molecular glue degrader / neo-substrate / cereblon / E3 ubiquitin ligase
Function / homology
Function and homology information


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 / 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 ...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 / 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 / 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 / mRNA transport / ectopic germ cell programmed cell death / positive regulation of Wnt signaling pathway / positive regulation of viral genome replication / negative regulation of protein-containing complex assembly / proteasomal protein catabolic process / positive regulation of gluconeogenesis / stress granule assembly / sperm end piece / nucleotide-excision repair / molecular condensate scaffold activity / positive regulation of protein-containing complex assembly / Recognition of DNA damage by PCNA-containing replication complex / protein homooligomerization / 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 / cytoplasmic stress granule / 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 principal piece / rhythmic process / site of double-strand break / sperm midpiece / Neddylation / protein-macromolecule adaptor activity / ubiquitin-dependent protein catabolic process / Potential therapeutics for SARS / damaged DNA binding / proteasome-mediated ubiquitin-dependent protein catabolic process / transmembrane transporter binding / chromosome, telomeric region / protein ubiquitination / innate immune response / DNA repair / mRNA binding / apoptotic process / DNA damage response / negative regulation of apoptotic process / protein-containing complex binding / nucleolus / perinuclear region of cytoplasm / SARS-CoV-2 activates/modulates innate and adaptive immune responses / protein-containing complex / extracellular space / DNA binding / RNA binding / extracellular exosome / nucleoplasm / metal ion binding / membrane / nucleus / cytoplasm / cytosol
Similarity search - Function
G3BP2, RNA recognition motif / Ras GTPase-activating protein-binding protein / Nuclear transport factor 2, eukaryote / Nuclear transport factor 2 domain profile. / Nuclear transport factor 2 (NTF2) domain / Nuclear transport factor 2 domain / Yippee/Mis18/Cereblon / Yippee zinc-binding/DNA-binding /Mis18, centromere assembly / CULT domain / CULT domain profile. ...G3BP2, RNA recognition motif / Ras GTPase-activating protein-binding protein / Nuclear transport factor 2, eukaryote / Nuclear transport factor 2 domain profile. / Nuclear transport factor 2 (NTF2) domain / Nuclear transport factor 2 domain / 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 / NTF2-like domain superfamily / RNA recognition motif / RNA recognition motif / Eukaryotic RNA Recognition Motif (RRM) profile. / RNA recognition motif domain / RNA-binding domain superfamily / Nucleotide-binding alpha-beta plait domain superfamily / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
: / DNA damage-binding protein 1 / Protein cereblon / Ras GTPase-activating protein-binding protein 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.5 Å
AuthorsQuan, C. / Petzold, G. / Gainza, P. / Tsai, J. / Bunker, R.D. / Wiedmer, L. / Donckele, E.J.
Funding support1items
OrganizationGrant numberCountry
Other private
CitationJournal: Nat Struct Mol Biol / Year: 2026
Title: Cereblon induces G3BP2 neosubstrate degradation using molecular surface mimicry.
Authors: Stefano Annunziato / Chao Quan / Etienne J Donckele / Ilaria Lamberto / Richard D Bunker / Mary Zlotosch / Laura Schwander / Anastasia Murthy / Lars Wiedmer / Camille Staehly / Michelle ...Authors: Stefano Annunziato / Chao Quan / Etienne J Donckele / Ilaria Lamberto / Richard D Bunker / Mary Zlotosch / Laura Schwander / Anastasia Murthy / Lars Wiedmer / Camille Staehly / Michelle Matysik / Samuel Gilberto / Despina Kapsitidou / Daric Wible / Gian Marco De Donatis / Peter Trenh / Rohitha SriRamaratnam / Vaik Strande / Raphael Lieberherr / David Lyon / Danielle Steiner / Joao Silva / Reinaldo Almeida / Elena Dolgikh / Bradley DeMarco / Jennifer Tsai / Amine Sadok / Vladislav Zarayskiy / Magnus Walter / Ralph Tiedt / Kevin J Lumb / Debora Bonenfant / Bernhard Fasching / John C Castle / Sharon A Townson / Pablo Gainza / Georg Petzold /
Abstract: Molecular glue degraders (MGDs) are small-molecule compounds that divert E3 ligases to degrade nonnatural substrates called neosubstrates. Clinically effective MGDs bind cereblon (CRBN), a substrate ...Molecular glue degraders (MGDs) are small-molecule compounds that divert E3 ligases to degrade nonnatural substrates called neosubstrates. Clinically effective MGDs bind cereblon (CRBN), a substrate receptor of the Cullin 4-RING E3 ubiquitin ligase (CRL4), and recruit neosubstrates to an MGD-induced neosurface on the CRBN CULT domain through molecular mimicry of a natural CRBN degron. Here, we identify G3BP2 (Ras-GAP SH3 domain-binding protein 2), a neosubstrate that bypasses canonical interactions with CRBN by engaging an unconventional binding site on the CRBN LON domain. The ternary complex interface does not resemble known interactions with CRBN. Instead, CRBN leverages a preexisting protein-protein interaction (PPI) hotspot on the target protein by mimicking an endogenous binding partner of G3BP2. Our findings suggest that composite neosurfaces that mimic and stabilize the footprint of natural PPIs (in short, 'glueprints') could become a viable strategy for the rational expansion of the MGD target repertoire.
History
DepositionMay 23, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 28, 2026Provider: repository / Type: Initial release
Revision 1.0Jan 28, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jan 28, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Revision 1.0Jan 28, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jan 28, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Feb 4, 2026Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.pdbx_database_id_PubMed / _citation.title / _em_admin.last_update
Revision 1.1Feb 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 / Data content type: EM metadata / EM metadata / EM metadata
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: Protein cereblon
A: DNA damage-binding protein 1
C: Ras GTPase-activating protein-binding protein 2
D: Ras GTPase-activating protein-binding protein 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)279,7346
Polymers279,0484
Non-polymers6872
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Protein cereblon


Mass: 43554.090 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CRBN, AD-006 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q96SW2
#2: 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: 127097.469 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DDB1, XAP1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q16531
#3: Protein Ras GTPase-activating protein-binding protein 2 / G3BP-2 / GAP SH3 domain-binding protein 2


Mass: 54198.070 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: G3BP2, KIAA0660 / Production host: Escherichia coli (E. coli) / References: UniProt: Q9UN86
#4: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#5: Chemical ChemComp-A1CED / (1S,3S)-2-[(2-chlorophenyl)methanesulfonyl]-N-{[(4R)-3-(2,4-dioxo-1,3-diazinan-1-yl)imidazo[1,2-a]pyridin-7-yl]methyl}-1-methyl-1,2,3,4-tetrahydroisoquinoline-3-carboxamide


Mass: 621.106 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C30H29ClN6O5S / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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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/CRBN-MRT-5702-G3BP2 ternary complex / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: C-flat-1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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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 magnification: 130000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 300 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 50.5056 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.21_5207 / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 565661 / Symmetry type: POINT
RefinementHighest resolution: 2.5 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00711371
ELECTRON MICROSCOPYf_angle_d0.76715417
ELECTRON MICROSCOPYf_dihedral_angle_d5.4621570
ELECTRON MICROSCOPYf_chiral_restr0.051732
ELECTRON MICROSCOPYf_plane_restr0.0062015

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