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- EMDB-72359: Cryo-EM structure of F-box helicase 1 (FBH1) bound to an SCF ubiq... -

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Basic information

Entry
Database: EMDB / ID: EMD-72359
TitleCryo-EM structure of F-box helicase 1 (FBH1) bound to an SCF ubiquitin ligase complex and a 3-way DNA fork (head structure)
Map dataFull map
Sample
  • Complex: Heterotetrameric SCF-FBH1 protein complex bound to a 3-way DNA fork
    • Complex: Heterotetrameric SCF-FBH1 protein complex
      • Protein or peptide: Cullin-1
      • Protein or peptide: E3 ubiquitin-protein ligase RBX1
    • Complex: 3-way DNA fork
KeywordsHelicase / Translocase / Fork remodeler / Fork reversal / Replication fork / DNA binding / TRANSFERASE
Function / homology
Function and homology information


Parkin-FBXW7-Cul1 ubiquitin ligase complex / negative regulation of beige fat cell differentiation / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / cullin-RING ubiquitin ligase complex / Cul7-RING ubiquitin ligase complex / cellular response to chemical stress / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / protein K27-linked ubiquitination / positive regulation of protein autoubiquitination ...Parkin-FBXW7-Cul1 ubiquitin ligase complex / negative regulation of beige fat cell differentiation / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / cullin-RING ubiquitin ligase complex / Cul7-RING ubiquitin ligase complex / cellular response to chemical stress / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / protein K27-linked ubiquitination / positive regulation of protein autoubiquitination / RNA polymerase II transcription initiation surveillance / protein neddylation / NEDD8 ligase activity / negative regulation of response to oxidative stress / VCB complex / Cul5-RING ubiquitin ligase complex / ubiquitin-ubiquitin ligase activity / SCF ubiquitin ligase complex / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / negative regulation of type I interferon production / Cul2-RING ubiquitin ligase complex / Cul3-RING ubiquitin ligase complex / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / negative regulation of mitophagy / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Prolactin receptor signaling / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / cullin family protein binding / protein monoubiquitination / site of DNA damage / protein K48-linked ubiquitination / signal transduction in response to DNA damage / Nuclear events stimulated by ALK signaling in cancer / transcription-coupled nucleotide-excision repair / regulation of cellular response to insulin stimulus / positive regulation of TORC1 signaling / negative regulation of insulin receptor signaling pathway / post-translational protein modification / intrinsic apoptotic signaling pathway / animal organ morphogenesis / Regulation of BACH1 activity / T cell activation / MAP3K8 (TPL2)-dependent MAPK1/3 activation / negative regulation of canonical NF-kappaB signal transduction / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / cellular response to amino acid stimulus / Degradation of DVL / Dectin-1 mediated noncanonical NF-kB signaling / Degradation of CRY and PER proteins / Activation of NF-kappaB in B cells / G1/S transition of mitotic cell cycle / Degradation of GLI1 by the proteasome / negative regulation of canonical Wnt signaling pathway / Iron uptake and transport / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Negative regulation of NOTCH4 signaling / Hedgehog 'on' state / Recognition of DNA damage by PCNA-containing replication complex / Vif-mediated degradation of APOBEC3G / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / Ubiquitin-Mediated Degradation of Phosphorylated Cdc25A / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / RING-type E3 ubiquitin transferase / Degradation of beta-catenin by the destruction complex / Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha / DNA Damage Recognition in GG-NER / NOTCH1 Intracellular Domain Regulates Transcription / Evasion by RSV of host interferon responses / CLEC7A (Dectin-1) signaling / SCF(Skp2)-mediated degradation of p27/p21 / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants / Dual Incision in GG-NER / FCERI mediated NF-kB activation / Transcription-Coupled Nucleotide Excision Repair (TC-NER) / Formation of TC-NER Pre-Incision Complex / Regulation of expression of SLITs and ROBOs / Interleukin-1 signaling / Formation of Incision Complex in GG-NER / Orc1 removal from chromatin / Regulation of RAS by GAPs / Dual incision in TC-NER / protein polyubiquitination / Regulation of RUNX2 expression and activity / Cyclin D associated events in G1 / Gap-filling DNA repair synthesis and ligation in TC-NER / positive regulation of protein catabolic process / ubiquitin-protein transferase activity / cellular response to UV / ubiquitin protein ligase activity / KEAP1-NFE2L2 pathway / Regulation of PLK1 Activity at G2/M Transition / Downstream TCR signaling / MAPK cascade / Antigen processing: Ubiquitination & Proteasome degradation / positive regulation of proteasomal ubiquitin-dependent protein catabolic process
Similarity search - Function
Zinc finger, RING-H2-type / RING-H2 zinc finger domain / : / Cullin alpha+beta domain / Cullin protein neddylation domain / : / Cullin, conserved site / Cullin family signature. / Cullin repeat-like-containing domain superfamily / Cullin protein, neddylation domain ...Zinc finger, RING-H2-type / RING-H2 zinc finger domain / : / Cullin alpha+beta 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, N-terminal / Cullin alpha solenoid domain / Cullin / Cullin homology domain / Cullin homology domain superfamily / Cullin family profile. / 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 / Cullin-1
Similarity search - Component
Biological speciesHomo sapiens (human) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.91 Å
AuthorsMullins EA / Schiltz CJ / Eichman BF
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35 GM136401 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)P01 CA092584 United States
CitationJournal: Nat Commun / Year: 2026
Title: Structural basis for fork reversal and RAD51 regulation by the SCF ubiquitin ligase complex of F-box helicase 1.
Authors: Briana H Greer / Javier Mendia-Garcia / Elwood A Mullins / Emma M Peacock / Sander K Haigh / Carl J Schiltz / Clara Aicart-Ramos / Miaw-Sheue Tsai / David Cortez / Fernando Moreno-Herrero / Brandt F Eichman /
Abstract: Replication fork reversal helps maintain genomic stability during replication stress. F-box helicase 1 (FBH1) catalyzes fork reversal and is an SCF (SKP-CUL1-F-box) E3 ubiquitin ligase that limits ...Replication fork reversal helps maintain genomic stability during replication stress. F-box helicase 1 (FBH1) catalyzes fork reversal and is an SCF (SKP-CUL1-F-box) E3 ubiquitin ligase that limits RAD51 association with chromatin. Here, we show that preferential binding of SCF to the lagging strand template at DNA fork structures stimulates helicase activity and is required for fork reversal. A cryo-EM structure of SCF bound to DNA representing a stalled fork reveals an intimate interaction between FBH1 and the fork junction. Disruption of this interface severely curtails fork reversal in vitro and replication progression in cells, providing a model for how ssDNA translocation by FBH1 facilitates annealing of parental DNA by a fundamentally different mechanism than the fork remodelers SMARCAL, HLTF, and ZRANB3. The structure provides a model for SCF disassembly of RAD51 filaments through translocation and ubiquitination, and implies that RAD51 is associated with the lagging strand at stalled forks.
History
DepositionAug 27, 2025-
Header (metadata) releaseJan 28, 2026-
Map releaseJan 28, 2026-
UpdateMar 11, 2026-
Current statusMar 11, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_72359.png

Downloads & links

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Map

FileDownload / File: emd_72359.map.gz / Format: CCP4 / Size: 600.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationFull map
Projections & slices

Image control

Size
Brightness
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AxesZ (Sec.)Y (Row.)X (Col.)
0.82 Å/pix.
x 540 pix.
= 441.72 Å		0.82 Å/pix.
x 540 pix.
= 441.72 Å		0.82 Å/pix.
x 540 pix.
= 441.72 Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.818 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.00305
Minimum - Maximum-0.0062492103 - 0.017404798
Average (Standard dev.)0.000003935815 (±0.00019303735)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions540540540
Spacing540540540
CellA=B=C: 441.72 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_72359_msk_1.map
Projections & Slices
AxesZYX

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Additional map: Sharpened map

Fileemd_72359_additional_1.map
AnnotationSharpened map
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Half map: Half map 1

Fileemd_72359_half_map_1.map
AnnotationHalf map 1
Projections & Slices
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Histogram

Histogram (log scale)

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Half map: Half map 2

Fileemd_72359_half_map_2.map
AnnotationHalf map 2
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Sample components

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Entire : Heterotetrameric SCF-FBH1 protein complex bound to a 3-way DNA fork

EntireName: Heterotetrameric SCF-FBH1 protein complex bound to a 3-way DNA fork
Components
  • Complex: Heterotetrameric SCF-FBH1 protein complex bound to a 3-way DNA fork
    • Complex: Heterotetrameric SCF-FBH1 protein complex
      • Protein or peptide: Cullin-1
      • Protein or peptide: E3 ubiquitin-protein ligase RBX1
    • Complex: 3-way DNA fork

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Supramolecule #1: Heterotetrameric SCF-FBH1 protein complex bound to a 3-way DNA fork

SupramoleculeName: Heterotetrameric SCF-FBH1 protein complex bound to a 3-way DNA fork
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all

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Supramolecule #2: Heterotetrameric SCF-FBH1 protein complex

SupramoleculeName: Heterotetrameric SCF-FBH1 protein complex / type: complex / ID: 2 / Parent: 1 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: 3-way DNA fork

SupramoleculeName: 3-way DNA fork / type: complex / ID: 3 / Parent: 1
Source (natural)Organism: synthetic construct (others)

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Macromolecule #1: Cullin-1

MacromoleculeName: Cullin-1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 89.800305 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
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 NINVPMETEQ KQEQETTHKN IEEDRKLLIQ AAIVRIMK M RKVLKHQQLL GEVLTQLSSR FKPRVPVIKK CIDILIEKEY LERVDGEKDT YSYLA

UniProtKB: Cullin-1

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Macromolecule #2: E3 ubiquitin-protein ligase RBX1

MacromoleculeName: E3 ubiquitin-protein ligase RBX1 / type: protein_or_peptide / ID: 2 / 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: Spodoptera frugiperda (fall armyworm)
SequenceString:
MAAAMDVDTP SGTNSGAGKK RFEVKKWNAV ALWAWDIVVD NCAICRNHIM DLCIECQANQ ASATSEECTV AWGVCNHAFH FHCISRWLK TRQVCPLDNR EWEFQKYGH

UniProtKB: E3 ubiquitin-protein ligase RBX1

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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

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Electron microscopy

MicroscopeTFS KRIOS
Image recording#0 - Image recording ID: 1 / #0 - Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / #0 - Average electron dose: 51.8 e/Å2 / #1 - Image recording ID: 2 / #1 - Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / #1 - Average electron dose: 54.5 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 105000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Image recording ID1
CTF correctionSoftware - Name: cryoSPARC / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE / Details: Ab initio reconstruction
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.91 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 156479
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

1ldk


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementProtocol: FLEXIBLE FIT
Output model

PDB-9xzk:
Cryo-EM structure of F-box helicase 1 (FBH1) bound to an SCF ubiquitin ligase complex and a 3-way DNA fork (head structure)

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