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- PDB-8or3: CAND1-CUL1-RBX1-SKP1-SKP2-DCNL1 -

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Basic information

Entry
Database: PDB / ID: 8or3
TitleCAND1-CUL1-RBX1-SKP1-SKP2-DCNL1
Components
  • (S-phase kinase-associated protein ...) x 2
  • Cullin-1
  • Cullin-associated NEDD8-dissociated protein 1
  • DCN1-like protein 1
  • E3 ubiquitin-protein ligase RBX1
KeywordsLIGASE / CAND1 / substrate receptor exchange factor / cullin-RING ligase / CRL / SCF / neddylation / DCNL1 co-E3 / ubiquitin signaling
Function / homology
Function and homology information


positive regulation of protein neddylation / SCF complex assembly / ubiquitin-like protein binding / positive regulation of protein polyubiquitination / Parkin-FBXW7-Cul1 ubiquitin ligase complex / negative regulation of catalytic activity / F-box domain binding / cellular response to cell-matrix adhesion / regulation of protein neddylation / Aberrant regulation of mitotic exit in cancer due to RB1 defects ...positive regulation of protein neddylation / SCF complex assembly / ubiquitin-like protein binding / positive regulation of protein polyubiquitination / Parkin-FBXW7-Cul1 ubiquitin ligase complex / negative regulation of catalytic activity / F-box domain binding / cellular response to cell-matrix adhesion / regulation of protein neddylation / Aberrant regulation of mitotic exit in cancer due to RB1 defects / PcG protein complex / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / cullin-RING ubiquitin ligase complex / positive regulation of ubiquitin protein ligase activity / cellular response to chemical stress / Cul7-RING ubiquitin ligase complex / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / maintenance of protein location in nucleus / positive regulation of protein autoubiquitination / RNA polymerase II transcription initiation surveillance / protein neddylation / ubiquitin conjugating enzyme binding / NEDD8 ligase activity / VCB complex / negative regulation of response to oxidative stress / Cul5-RING ubiquitin ligase complex / SCF ubiquitin ligase complex / negative regulation of type I interferon production / Cul2-RING ubiquitin ligase complex / ubiquitin-ubiquitin ligase activity / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Cul3-RING ubiquitin ligase complex / positive regulation of intracellular estrogen receptor signaling pathway / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / negative regulation of mitophagy / Prolactin receptor signaling / cullin family protein binding / positive regulation of RNA polymerase II transcription preinitiation complex assembly / protein K63-linked ubiquitination / regulation of protein ubiquitination / protein monoubiquitination / ubiquitin ligase complex / ubiquitin-like ligase-substrate adaptor activity / protein K48-linked ubiquitination / positive regulation of double-strand break repair via homologous recombination / Nuclear events stimulated by ALK signaling in cancer / transcription-coupled nucleotide-excision repair / positive regulation of TORC1 signaling / regulation of cellular response to insulin stimulus / positive regulation of smooth muscle cell proliferation / intrinsic apoptotic signaling pathway / negative regulation of insulin receptor signaling pathway / post-translational protein modification / TBP-class protein binding / Regulation of BACH1 activity / molecular function activator activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / T cell activation / animal organ morphogenesis / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / Vpu mediated degradation of CD4 / Degradation of DVL / cellular response to amino acid stimulus / Dectin-1 mediated noncanonical NF-kB signaling / Activation of NF-kappaB in B cells / Degradation of GLI1 by the proteasome / Iron uptake and transport / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Recognition of DNA damage by PCNA-containing replication complex / Negative regulation of NOTCH4 signaling / Vif-mediated degradation of APOBEC3G / Hedgehog 'on' state / G1/S transition of mitotic cell cycle / negative regulation of canonical Wnt signaling pathway / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1 / DNA Damage Recognition in GG-NER / Degradation of beta-catenin by the destruction complex / beta-catenin binding / RING-type E3 ubiquitin transferase / Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha / Evasion by RSV of host interferon responses / NOTCH1 Intracellular Domain Regulates Transcription / Dual Incision in GG-NER / CLEC7A (Dectin-1) signaling / Transcription-Coupled Nucleotide Excision Repair (TC-NER) / Formation of TC-NER Pre-Incision Complex / SCF(Skp2)-mediated degradation of p27/p21 / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants / FCERI mediated NF-kB activation / Regulation of expression of SLITs and ROBOs
Similarity search - Function
TATA-binding protein interacting (TIP20) / Cullin-associated NEDD8-dissociated protein 1/2 / TATA-binding protein interacting (TIP20) / Potentiating neddylation domain / Defective-in-cullin neddylation protein / DCN1-like, PONY binding domain / Cullin binding / DCUN1 domain profile. / UBA-like domain / HEAT-like repeat ...TATA-binding protein interacting (TIP20) / Cullin-associated NEDD8-dissociated protein 1/2 / TATA-binding protein interacting (TIP20) / Potentiating neddylation domain / Defective-in-cullin neddylation protein / DCN1-like, PONY binding domain / Cullin binding / DCUN1 domain profile. / UBA-like domain / HEAT-like repeat / A Receptor for Ubiquitination Targets / Leucine-rich repeat, cysteine-containing subtype / Leucine-rich repeat - CC (cysteine-containing) subfamily / F-box domain profile. / F-box-like / F-box-like domain superfamily / SKP1 component, dimerisation / S-phase kinase-associated protein 1 / SKP1-like, dimerisation domain superfamily / Skp1 family, dimerisation domain / F-box domain / Zinc finger, RING-H2-type / RING-H2 zinc finger domain / Cullin protein neddylation domain / : / Cullin, conserved site / Cullin family signature. / Cullin repeat-like-containing domain superfamily / Cullin protein, neddylation domain / Cullin / Cullin protein neddylation domain / Cullin / Cullin, N-terminal / Cullin homology domain / Cullin homology domain superfamily / Cullin alpha solenoid domain / Cullin family profile. / S-phase kinase-associated protein 1-like / SKP1 component, POZ domain / Skp1 family, tetramerisation domain / Found in Skp1 protein family / UBA-like superfamily / SKP1/BTB/POZ domain superfamily / Leucine-rich repeat domain superfamily / Zinc finger RING-type profile. / Zinc finger, RING-type / Armadillo-like helical / Armadillo-type fold / Zinc finger, RING/FYVE/PHD-type / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
E3 ubiquitin-protein ligase RBX1 / S-phase kinase-associated protein 1 / S-phase kinase-associated protein 2 / Cullin-1 / Cullin-associated NEDD8-dissociated protein 1 / DCN1-like protein 1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsShaaban, M. / Clapperton, J.A. / Ding, S. / Maeots, M.E. / Enchev, R.I.
Funding support United Kingdom, 4items
OrganizationGrant numberCountry
The Francis Crick Institute United Kingdom
Cancer Research UKCC2059 United Kingdom
Medical Research Council (MRC, United Kingdom)CC2059 United Kingdom
Wellcome TrustCC2059 United Kingdom
CitationJournal: Mol Cell / Year: 2023
Title: Structural and mechanistic insights into the CAND1-mediated SCF substrate receptor exchange.
Authors: Mohammed Shaaban / Julie A Clapperton / Shan Ding / Simone Kunzelmann / Märt-Erik Mäeots / Sarah L Maslen / J Mark Skehel / Radoslav I Enchev /
Abstract: Modular SCF (SKP1-CUL1-Fbox) ubiquitin E3 ligases orchestrate multiple cellular pathways in eukaryotes. Their variable SKP1-Fbox substrate receptor (SR) modules enable regulated substrate recruitment ...Modular SCF (SKP1-CUL1-Fbox) ubiquitin E3 ligases orchestrate multiple cellular pathways in eukaryotes. Their variable SKP1-Fbox substrate receptor (SR) modules enable regulated substrate recruitment and subsequent proteasomal degradation. CAND proteins are essential for the efficient and timely exchange of SRs. To gain structural understanding of the underlying molecular mechanism, we reconstituted a human CAND1-driven exchange reaction of substrate-bound SCF alongside its co-E3 ligase DCNL1 and visualized it by cryo-EM. We describe high-resolution structural intermediates, including a ternary CAND1-SCF complex, as well as conformational and compositional intermediates representing SR- or CAND1-dissociation. We describe in molecular detail how CAND1-induced conformational changes in CUL1/RBX1 provide an optimized DCNL1-binding site and reveal an unexpected dual role for DCNL1 in CAND1-SCF dynamics. Moreover, a partially dissociated CAND1-SCF conformation accommodates cullin neddylation, leading to CAND1 displacement. Our structural findings, together with functional biochemical assays, help formulate a detailed model for CAND-SCF regulation.
History
DepositionApr 13, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jun 28, 2023Provider: repository / Type: Initial release
Revision 1.0Jun 28, 2023Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.1Jul 19, 2023Group: Data collection / Database references / Category: citation / pdbx_validate_planes
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Revision 1.2Jul 24, 2024Group: Data collection
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Revision 1.3Jul 9, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details
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Revision 1.1Jul 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Cullin-1
B: E3 ubiquitin-protein ligase RBX1
C: Cullin-associated NEDD8-dissociated protein 1
D: S-phase kinase-associated protein 1
E: S-phase kinase-associated protein 2
F: DCN1-like protein 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)340,8959
Polymers340,6996
Non-polymers1963
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 4 types, 4 molecules ABCF

#1: Protein Cullin-1 / CUL-1


Mass: 93730.672 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CUL1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q13616
#2: Protein E3 ubiquitin-protein ligase RBX1 / E3 ubiquitin-protein transferase RBX1 / Protein ZYP / RING finger protein 75 / RING-box protein 1 / ...E3 ubiquitin-protein transferase RBX1 / Protein ZYP / RING finger protein 75 / RING-box protein 1 / Rbx1 / Regulator of cullins 1 / ROC1


Mass: 12289.977 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: RBX1, RNF75, ROC1 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P62877, RING-type E3 ubiquitin transferase, cullin-RING-type E3 NEDD8 transferase
#3: Protein Cullin-associated NEDD8-dissociated protein 1 / Cullin-associated and neddylation-dissociated protein 1 / TBP-interacting protein of 120 kDa A / ...Cullin-associated and neddylation-dissociated protein 1 / TBP-interacting protein of 120 kDa A / TBP-interacting protein 120A / p120 CAND1


Mass: 137358.219 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CAND1, KIAA0829, TIP120, TIP120A / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q86VP6
#6: Protein DCN1-like protein 1 / DCNL1 / DCUN1 domain-containing protein 1 / Defective in cullin neddylation protein 1-like protein ...DCNL1 / DCUN1 domain-containing protein 1 / Defective in cullin neddylation protein 1-like protein 1 / Squamous cell carcinoma-related oncogene


Mass: 30304.439 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DCUN1D1, DCN1, DCUN1L1, RP42, SCCRO / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q96GG9

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S-phase kinase-associated protein ... , 2 types, 2 molecules DE

#4: Protein S-phase kinase-associated protein 1 / Cyclin-A/CDK2-associated protein p19 / p19A / Organ of Corti protein 2 / OCP-2 / Organ of Corti ...Cyclin-A/CDK2-associated protein p19 / p19A / Organ of Corti protein 2 / OCP-2 / Organ of Corti protein II / OCP-II / RNA polymerase II elongation factor-like protein / SIII / Transcription elongation factor B polypeptide 1-like / p19skp1


Mass: 18679.965 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SKP1, EMC19, OCP2, SKP1A, TCEB1L / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P63208
#5: Protein S-phase kinase-associated protein 2 / Cyclin-A/CDK2-associated protein p45 / F-box protein Skp2 / F-box/LRR-repeat protein 1 / p45skp2


Mass: 48335.312 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SKP2, FBXL1 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q13309

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Non-polymers , 1 types, 3 molecules

#7: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Zn

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Details

Has ligand of interestN
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: CAND1-CUL1-RBX1-SKP1-SKP2-CKS1-CDK2-CyclinE-DCNL1 / Type: COMPLEX / Entity ID: #1-#6 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameBuffer-ID
125 mMHEPES1
2150 mMNaCl1
31 mMTCEP1
40.1 percentoctyl glucoside1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN 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: 2500 nm / Nominal defocus min: 700 nm
Image recordingElectron dose: 49.1 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 735959 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00219080
ELECTRON MICROSCOPYf_angle_d0.5925783
ELECTRON MICROSCOPYf_dihedral_angle_d4.1682523
ELECTRON MICROSCOPYf_chiral_restr0.0362993
ELECTRON MICROSCOPYf_plane_restr0.0053274

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