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- PDB-9c5u: Cryo EM structure of DCAF2:Compound 1 complex -

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Basic information

Entry
Database: PDB / ID: 9c5u
TitleCryo EM structure of DCAF2:Compound 1 complex
Components
  • DET1- and DDB1-associated protein 1
  • DNA damage-binding protein 1
  • Denticleless protein homolog
KeywordsLIGASE / DTL / DDB1 / E3 ligase / covalent / fragment
Function / homology
Function and homology information


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 / regulation of mitotic cell cycle phase transition / WD40-repeat domain binding / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Cul4B-RING E3 ubiquitin ligase complex ...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 / regulation of mitotic cell cycle phase transition / WD40-repeat domain binding / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / mitotic G2 DNA damage checkpoint signaling / negative regulation of reproductive process / negative regulation of developmental process / cullin family protein binding / viral release from host cell / protein monoubiquitination / positive regulation of G2/M transition of mitotic cell cycle / ectopic germ cell programmed cell death / translesion synthesis / positive regulation of viral genome replication / response to UV / proteasomal protein catabolic process / positive regulation of gluconeogenesis / nucleotide-excision repair / 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 / Formation of Incision Complex in GG-NER / Wnt signaling pathway / protein polyubiquitination / 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 / rhythmic process / positive regulation of proteasomal ubiquitin-dependent protein catabolic process / chromosome / site of double-strand break / Neddylation / ubiquitin-dependent protein catabolic process / nuclear membrane / protein-macromolecule adaptor activity / proteasome-mediated ubiquitin-dependent protein catabolic process / damaged DNA binding / chromosome, telomeric region / DNA replication / regulation of cell cycle / protein ubiquitination / DNA repair / apoptotic process / DNA damage response / centrosome / negative regulation of apoptotic process / protein-containing complex binding / nucleolus / protein-containing complex / extracellular space / DNA binding / extracellular exosome / nucleoplasm / nucleus / cytoplasm / cytosol
Similarity search - Function
: / DET1- and DDB1-associated protein 1, N-terminal / DET1- and DDB1-associated protein 1 / Det1 complexing ubiquitin ligase / 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 ...: / DET1- and DDB1-associated protein 1, N-terminal / DET1- and DDB1-associated protein 1 / Det1 complexing ubiquitin ligase / 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 / WD domain, G-beta repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
: / DNA damage-binding protein 1 / DET1- and DDB1-associated protein 1 / Denticleless protein homolog
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.05 Å
AuthorsMcMahon, E.J. / Wang, W.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Structure / Year: 2025
Title: Structural basis for DCAF2 as a novel E3 ligase for PROTAC-mediated targeted protein degradation.
Authors: Evan J McMahon / Alexander G Cioffi / Patrick R Visperas / Yueqing Lin / Michael Shaghafi / Courtney M Daczkowski / Johannes C Hermann / Robert A Everley / Richard M Neve / Daniel A Erlanson ...Authors: Evan J McMahon / Alexander G Cioffi / Patrick R Visperas / Yueqing Lin / Michael Shaghafi / Courtney M Daczkowski / Johannes C Hermann / Robert A Everley / Richard M Neve / Daniel A Erlanson / Kevin R Webster / Vikram Narayan / Weiru Wang /
Abstract: Targeted protein degradation (TPD) leverages the ubiquitin-proteasome system to eliminate disease-causing proteins via E3 ligases. To date, the field is limited to utilizing a few of the over 600 ...Targeted protein degradation (TPD) leverages the ubiquitin-proteasome system to eliminate disease-causing proteins via E3 ligases. To date, the field is limited to utilizing a few of the over 600 human E3 ligases. To expand this repertoire, we conducted structural and functional validation of DDB1 (Damage-specific DNA binding protein 1) and Cullin-associated factor (DCAF)2 (DTL/CDT2), a Cullin4-RING ligase substrate adaptor implicated in DNA damage response and cancer, as a novel E3 for TPD. Cryoelectron microscopy (cryo-EM) structures of the DCAF2:DDB1:DDA1 complex (3.3 Å), a ligand bound complex (3.1 Å), and a ternary complex with a covalent proteolysis-targeting chimera (PROTAC) and BRD4 (3.4 Å) reveal PROTAC-mediated substrate recruitment. Using covalent bifunctional tool compounds engaging residue C141 in the WD40 domain, we demonstrate robust ubiquitination in biochemical assays and cellular TPD using the COFFEE (covalent functionalization followed by E3 electroporation) method. These findings position DCAF2 as a promising E3 adaptor for PROTAC strategies and identify C141 as a relevant site for future PROTAC discovery.
History
DepositionJun 6, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 1, 2025Provider: repository / Type: Initial release
Revision 1.1Oct 15, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed ..._citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Denticleless protein homolog
B: DNA damage-binding protein 1
C: DET1- and DDB1-associated protein 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)191,0844
Polymers190,8403
Non-polymers2441
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 Denticleless protein homolog / DDB1- and CUL4-associated factor 2 / Lethal(2) denticleless protein homolog / Retinoic acid- ...DDB1- and CUL4-associated factor 2 / Lethal(2) denticleless protein homolog / Retinoic acid-regulated nuclear matrix-associated protein


Mass: 51887.121 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DTL, CDT2, CDW1, DCAF2, L2DTL, RAMP / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9NZJ0
#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 DET1- and DDB1-associated protein 1 / Placenta cross-immune reaction antigen 1 / PCIA-1


Mass: 11855.297 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DDA1, C19orf58, PCIA1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9BW61
#4: Chemical ChemComp-A1AUM / 1'-acetyl-1',4'-dihydro-3'H-spiro[cyclopentane-1,2'-quinoxalin]-3'-one


Mass: 244.289 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C14H16N2O2 / 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: DCAF2 / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 1200 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1.4 sec. / Electron dose: 50.26 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 7189
EM imaging opticsEnergyfilter name: GIF Quantum LS / Energyfilter slit width: 20 eV / Phase plate: VOLTA PHASE PLATE

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2Leginonimage acquisition
4cryoSPARCCTF correction
7Cootmodel fitting
12cryoSPARC3D reconstruction
13PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1214322
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.05 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 26185 / Symmetry type: POINT
Atomic model buildingDetails: Apo structure / Source name: Other / Type: experimental model
RefinementHighest resolution: 3.05 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00312255
ELECTRON MICROSCOPYf_angle_d0.52616603
ELECTRON MICROSCOPYf_dihedral_angle_d4.4441652
ELECTRON MICROSCOPYf_chiral_restr0.0431874
ELECTRON MICROSCOPYf_plane_restr0.0042149

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