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- EMDB-62222: Cryo-EM structure of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition liga... -

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Entry
Database: EMDB / ID: EMD-62222
TitleCryo-EM structure of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex
Map data
Sample
  • Complex: Cryo-EM of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex
    • Protein or peptide: S-phase kinase-associated protein 1
    • Protein or peptide: F-box only protein 3
    • Protein or peptide: E3 ubiquitin-protein ligase RBX1
    • Protein or peptide: Cullin-1
Keywordsubiquitination E3 ligase / Cryo-EM / PROTEIN BINDING / LIGASE
Function / homology
Function and homology information


Parkin-FBXW7-Cul1 ubiquitin ligase complex / F-box domain binding / PcG protein complex / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / cullin-RING ubiquitin ligase complex / positive regulation of ubiquitin protein ligase activity / Cul7-RING ubiquitin ligase complex / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / cellular response to chemical stress ...Parkin-FBXW7-Cul1 ubiquitin ligase complex / F-box domain binding / PcG protein complex / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / cullin-RING ubiquitin ligase complex / positive regulation of ubiquitin protein ligase activity / Cul7-RING ubiquitin ligase complex / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / cellular response to chemical stress / 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 / 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 / ubiquitin-ubiquitin ligase activity / Cul2-RING ubiquitin ligase complex / 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 / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / negative regulation of mitophagy / Prolactin receptor signaling / cullin family protein binding / protein monoubiquitination / ubiquitin-like ligase-substrate adaptor activity / protein K48-linked ubiquitination / 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 / intrinsic apoptotic signaling pathway / negative regulation of insulin receptor signaling pathway / post-translational protein modification / 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 / 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 / Formation of Incision Complex in GG-NER / Interleukin-1 signaling / Orc1 removal from chromatin / protein polyubiquitination / Dual incision in TC-NER / Regulation of RAS by GAPs / Gap-filling DNA repair synthesis and ligation in TC-NER / Regulation of RUNX2 expression and activity / positive regulation of protein catabolic process / ubiquitin-protein transferase activity / Cyclin D associated events in G1 / cellular response to UV / ubiquitin protein ligase activity / KEAP1-NFE2L2 pathway / : / Regulation of PLK1 Activity at G2/M Transition / Downstream TCR signaling / Antigen processing: Ubiquitination & Proteasome degradation
Similarity search - Function
: / ApaG domain / ApaG domain superfamily / ApaG domain / ApaG domain profile. / SMI1 / KNR4 family (SUKH-1) / Knr4/Smi1-like domain / SMI1 / KNR4 family / Knr4/Smi1-like domain superfamily / A Receptor for Ubiquitination Targets ...: / ApaG domain / ApaG domain superfamily / ApaG domain / ApaG domain profile. / SMI1 / KNR4 family (SUKH-1) / Knr4/Smi1-like domain / SMI1 / KNR4 family / Knr4/Smi1-like domain superfamily / A Receptor for Ubiquitination Targets / 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 / SKP1/BTB/POZ domain superfamily / Zinc finger RING-type profile. / Zinc finger, RING-type / 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 / Cullin-1 / F-box only protein 3
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsWei J / Xu C
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Proteins / Year: 2025
Title: Structural Insight Into the SKP1-CUL1-FBXO3-RBX1 Complex.
Authors: Jiajia Wei / Chao Xu /
Abstract: The cryo-EM structure of human SCF, which consists of CUL1, RBX1, SKP1 and FBXO3 was solved at a nominal resolution of 3.70 Å. Although a previous study reported the crystal structure of the FBXO3 ...The cryo-EM structure of human SCF, which consists of CUL1, RBX1, SKP1 and FBXO3 was solved at a nominal resolution of 3.70 Å. Although a previous study reported the crystal structure of the FBXO3 ApaG domain, how FBXO3 is incorporated into the SCF complex remains elusive. In the cryo-EM structure of SCF, the F-box domain of FBXO3 primarily associates with SKP1 via extensive hydrophobic interactions and interacts with the N-terminal region of CUL1 via hydrophobic interactions. The weak cryo-EM map of the RBX1 globular region is close to the FBXO3 ApaG domain, suggesting that unmodified SCF exhibits a closed conformation and that CUL1 neddylation is likely required to achieve high E3 activity. The structural study provides insight into the assembly of SCF and its activation mediated by CUL1 neddylation.
History
DepositionOct 30, 2024-
Header (metadata) releaseFeb 19, 2025-
Map releaseFeb 19, 2025-
UpdateJul 23, 2025-
Current statusJul 23, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_62222.png

Downloads & links

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Map

FileDownload / File: emd_62222.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.82 Å/pix.
x 384 pix.
= 314.88 Å		0.82 Å/pix.
x 384 pix.
= 314.88 Å		0.82 Å/pix.
x 384 pix.
= 314.88 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.82 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.03
Minimum - Maximum-0.47538152 - 0.6360594
Average (Standard dev.)0.000038221486 (±0.007934256)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 314.88 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_62222_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

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Half map: #1

Fileemd_62222_half_map_2.map
Projections & Slices
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Sample components

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Entire : Cryo-EM of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex

EntireName: Cryo-EM of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex
Components
  • Complex: Cryo-EM of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex
    • Protein or peptide: S-phase kinase-associated protein 1
    • Protein or peptide: F-box only protein 3
    • Protein or peptide: E3 ubiquitin-protein ligase RBX1
    • Protein or peptide: Cullin-1

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Supramolecule #1: Cryo-EM of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex

SupramoleculeName: Cryo-EM of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Details: Cryo-EM of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: S-phase kinase-associated protein 1

MacromoleculeName: S-phase kinase-associated protein 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 18.679965 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MPSIKLQSSD GEIFEVDVEI AKQSVTIKTM LEDLGMDDEG DDDPVPLPNV NAAILKKVIQ WCTHHKDDPP PPEDDENKEK RTDDIPVWD QEFLKVDQGT LFELILAANY LDIKGLLDVT CKTVANMIKG KTPEEIRKTF NIKNDFTEEE EAQVRKENQW C EEK

UniProtKB: S-phase kinase-associated protein 1

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Macromolecule #2: F-box only protein 3

MacromoleculeName: F-box only protein 3 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 50.305582 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: METETAPLTL ESLPTDPLLL ILSFLDYRDL INCCYVSRRL SQLSSHDPLW RRHCKKYWLI SEEEKTQKNQ CWKSLFIDTY SDVGRYIDH YAAIKKAWDD LKKYLEPRCP RMVLSLKEGA REEDLDAVEA QIGCKLPDDY RCSYRIHNGQ KLVVPGLLGS M ALSNHYRS ...String:
METETAPLTL ESLPTDPLLL ILSFLDYRDL INCCYVSRRL SQLSSHDPLW RRHCKKYWLI SEEEKTQKNQ CWKSLFIDTY SDVGRYIDH YAAIKKAWDD LKKYLEPRCP RMVLSLKEGA REEDLDAVEA QIGCKLPDDY RCSYRIHNGQ KLVVPGLLGS M ALSNHYRS EDLLDVDTAA GGFQQRQGLK YCLPLTFCIH TGLSQYIAVE AAEGRNKNEV FYQCPDQMAR NPAAIDMFII GA TFTDWFT SYVKNVVSGG FPIIRDQIFR YVHDPECVAT TGDITVSVST SFLPELSSVH PPHYFFTYRI RIEMSKDALP EKA CQLDSR YWRITNAKGD VEEVQGPGVV GEFPIISPGR VYEYTSCTTF STTSGYMEGY YTFHFLYFKD KIFNVAIPRF HMAC PTFRV SIARLEMGPD EYEEMEEEEE EEEEEDEDDD S

UniProtKB: F-box only protein 3

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Macromolecule #3: E3 ubiquitin-protein ligase RBX1

MacromoleculeName: E3 ubiquitin-protein ligase RBX1 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO / EC number: RING-type E3 ubiquitin transferase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 12.289977 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MAAAMDVDTP SGTNSGAGKK RFEVKKWNAV ALWAWDIVVD NCAICRNHIM DLCIECQANQ ASATSEECTV AWGVCNHAFH FHCISRWLK TRQVCPLDNR EWEFQKYGH

UniProtKB: E3 ubiquitin-protein ligase RBX1

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Macromolecule #4: Cullin-1

MacromoleculeName: Cullin-1 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 89.800367 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSSTRSQNPH GLKQIGLDQI WDDLRAGIQQ VYTRQSMAKS RYMELYTHVY NYCTSVHQSN QARGAGVPPS KSKKGQTPGG AQFVGLELY KRLKEFLKNY LTNLLKDGED LMDESVLKFY TQQWEDYRFS SKVLNGICAY LNRHWVRREC DEGRKGIYEI Y SLALVTWR ...String:
MSSTRSQNPH GLKQIGLDQI WDDLRAGIQQ VYTRQSMAKS RYMELYTHVY NYCTSVHQSN QARGAGVPPS KSKKGQTPGG AQFVGLELY KRLKEFLKNY LTNLLKDGED LMDESVLKFY TQQWEDYRFS SKVLNGICAY LNRHWVRREC DEGRKGIYEI Y SLALVTWR DCLFRPLNKQ VTNAVLKLIE KERNGETINT RLISGVVQSY VELGLNEDDA FAKGPTLTVY KESFESQFLA DT ERFYTRE STEFLQQNPV TEYMKKAEAR LLEEQRRVQV YLHESTQDEL ARKCEQVLIE KHLEIFHTEF QNLLDADKNE DLG RMYNLV SRIQDGLGEL KKLLETHIHN QGLAAIEKCG EAALNDPKMY VQTVLDVHKK YNALVMSAFN NDAGFVAALD KACG RFINN NAVTKMAQSS SKSPELLARY CDSLLKKSSK NPEEAELEDT LNQVMVVFKY IEDKDVFQKF YAKMLAKRLV HQNSA SDDA EASMISKLKQ ACGFEYTSKL QRMFQDIGVS KDLNEQFKKH LTNSEPLDLD FSIQVLSSGS WPFQQSCTFA LPSELE RSY QRFTAFYASR HSGRKLTWLY QLSKGELVTN CFKNRYTLQA STFQMAILLQ YNTEDAYTVQ QLTDSTQIKM DILAQVL QI LLKSKLLVLE DENANVDEVE LKPDTLIKLY LGYKNKKLRV NINVPMKTEQ KQEQETTHKN IEEDRKLLIQ AAIVRIMK M RKVLKHQQLL GEVLTQLSSR FKPRVPVIKK CIDILIEKEY LERVDGEKDT YSYLA

UniProtKB: Cullin-1

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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

BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 55.62 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.9 µm / Nominal defocus min: 1.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 185300
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

PDB-9kbd:
Cryo-EM structure of the CUL1-RBX1-SKP1-FBXO3 SCF ubiquition ligase complex

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