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- PDB-9ltl: Cryo-EM structure of DDB1-DDA1-DET1 complex -

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Basic information

Entry
Database: PDB / ID: 9ltl
TitleCryo-EM structure of DDB1-DDA1-DET1 complex
Components
  • DET1 homolog
  • DET1- and DDB1-associated protein 1
  • DNA damage-binding protein 1
KeywordsLIGASE / E3 ligase component
Function / homology
Function and homology information


cullin-RING 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 ...cullin-RING 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 / negative regulation of reproductive process / negative regulation of developmental process / viral release from host cell / cullin family protein binding / ectopic germ cell programmed cell death / positive regulation of viral genome replication / ubiquitin-like ligase-substrate adaptor activity / 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 / Antigen processing: Ubiquitination & Proteasome degradation / site of double-strand break / Neddylation / protein-containing complex assembly / ubiquitin-dependent protein catabolic process / protein-macromolecule adaptor activity / proteasome-mediated ubiquitin-dependent protein catabolic process / damaged DNA binding / chromosome, telomeric region / protein ubiquitination / DNA repair / apoptotic process / DNA damage response / ubiquitin protein ligase binding / negative regulation of apoptotic process / protein-containing complex binding / nucleolus / protein-containing complex / extracellular space / DNA binding / extracellular exosome / nucleoplasm / nucleus / cytoplasm
Similarity search - Function
De-etiolated protein 1, Det1 / De-etiolated protein 1 Det1 / 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 ...De-etiolated protein 1, Det1 / De-etiolated protein 1 Det1 / 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 / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
DNA damage-binding protein 1 / DET1 homolog / DET1- and DDB1-associated protein 1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.93 Å
AuthorsSu, M.-Y. / Wang, S. / Teng, F.
Funding support China, 1items
OrganizationGrant numberCountry
Other government2024A1515011683 China
CitationJournal: Nat Commun / Year: 2026
Title: Cryo-EM structure of the human COP1-DET1 ubiquitin ligase complex.
Authors: Shan Wang / Fei Teng / Goran Stjepanovic / Feng Rao / Ming-Yuan Su /
Abstract: Ubiquitin modifications regulate fundamental cellular activities by modulating protein stability and function. The ubiquitin ligase COP1, which is present across species from plants to humans, plays ...Ubiquitin modifications regulate fundamental cellular activities by modulating protein stability and function. The ubiquitin ligase COP1, which is present across species from plants to humans, plays a crucial role in the ubiquitination of developmental transcription factors. While COP1 can function independently, it can also be incorporated into CULLIN4-RING ubiquitin ligase (CRL4) complexes through the DET1 adaptor protein. Despite its biological significance, the structural and functional mechanisms of COP1 and DET1-containing complexes remains poorly understood. Here we present the cryo-electron microscopy structures of human COP1 in complex with DDB1-DDA1-DET1 and Ube2e2, revealing an inactive stacked assembly state. Co-expression with COP1 substrates including c-Jun or ETS2 disrupts this configuration, inducing a conformational rearrangement into a distinct dimeric state that allows substrate access. Structural modelling identifies the spatial organization of COP1 WD40 domains where substrate recruits. DET1 serves as a structural scaffold, bridging COP1 and Ube2e2 to initiate potential ubiquitin addition on substrates, while DDB1 recruits the CULLIN4-RBX1 complex to facilitate Ube2d3-mediated ubiquitin chain elongation. These results reveal the dynamic interplay between the structural states of the CRL4 E3 ligase complex and its substrate specific activation mechanism, offering mechanistic insights into ubiquitination regulation and a basis for future studies on E3 ligase dynamics.
History
DepositionFeb 6, 2025Deposition site: PDBJ / Processing site: PDBC
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: Additional map / Part number: 1 / Data content type: Additional map / 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
Revision 1.0Jan 28, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
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

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: DET1 homolog
B: DNA damage-binding protein 1
F: DET1- and DDB1-associated protein 1


Theoretical massNumber of molelcules
Total (without water)202,8843
Polymers202,8843
Non-polymers00
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 DET1 homolog / De-etiolated-1 homolog


Mass: 63931.367 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DET1 / Production host: Homo sapiens (human) / References: UniProt: Q7L5Y6
#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: Homo sapiens (human) / 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: Homo sapiens (human) / References: UniProt: Q9BW61
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: protein complex of DDB1-DDA1-DET1 complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.2 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenConc.: 0.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: the purified protein was at 0.535 or 0.3 mg/ml and applied to fresh glow-discharged UltrAuFoil (1.2/1.3, 300 mesh) grids
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: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 46.55 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)
Details: The total dose on the specimen was 46.55, 46.32, 47.42, and 48.6 e-/A2, total exposure time of 2.497 or 1.997 sec, fractionated over 50 frames.

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIX1.21.1_5286model refinement
13cryoSPARC3D reconstruction
CTF correctionType: NONE
3D reconstructionResolution: 2.93 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 401370 / Symmetry type: POINT
RefinementHighest resolution: 2.93 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0038207
ELECTRON MICROSCOPYf_angle_d0.54211173
ELECTRON MICROSCOPYf_dihedral_angle_d4.2371185
ELECTRON MICROSCOPYf_chiral_restr0.0441326
ELECTRON MICROSCOPYf_plane_restr0.0041437

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