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- PDB-9xzk: Cryo-EM structure of F-box helicase 1 (FBH1) bound to an SCF ubiq... -

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Basic information

Entry
Database: PDB / ID: 9xzk
TitleCryo-EM structure of F-box helicase 1 (FBH1) bound to an SCF ubiquitin ligase complex and a 3-way DNA fork (head structure)
Components
  • Cullin-1
  • E3 ubiquitin-protein ligase RBX1
KeywordsTRANSFERASE / Helicase / Translocase / Fork remodeler / Fork reversal / Replication fork / DNA binding
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 / positive regulation of protein autoubiquitination / RNA polymerase II transcription initiation surveillance ...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 / positive regulation of protein autoubiquitination / RNA polymerase II transcription initiation surveillance / protein neddylation / NEDD8 ligase activity / protein K27-linked ubiquitination / 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 / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Prolactin receptor signaling / negative regulation of mitophagy / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / cullin family protein binding / protein monoubiquitination / site of DNA damage / signal transduction in response to DNA damage / Nuclear events stimulated by ALK signaling in cancer / transcription-coupled nucleotide-excision repair / protein K48-linked ubiquitination / negative regulation of insulin receptor signaling pathway / regulation of cellular response to insulin stimulus / positive regulation of TORC1 signaling / intrinsic apoptotic signaling pathway / post-translational protein modification / animal organ morphogenesis / T cell activation / Regulation of BACH1 activity / 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 / Degradation of GLI1 by the proteasome / G1/S transition of mitotic cell cycle / Iron uptake and transport / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / negative regulation of canonical Wnt signaling pathway / Negative regulation of NOTCH4 signaling / Recognition of DNA damage by PCNA-containing replication complex / Hedgehog 'on' state / 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 / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants / SCF(Skp2)-mediated degradation of p27/p21 / 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 / Cyclin D associated events in G1 / Regulation of RUNX2 expression and activity / Gap-filling DNA repair synthesis and ligation in TC-NER / positive regulation of protein catabolic process / ubiquitin-protein transferase activity / cellular response to UV / KEAP1-NFE2L2 pathway / ubiquitin protein ligase activity / 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 protein neddylation domain / : / Cullin, N-terminal / Cullin, conserved site / Cullin family signature. / Cullin repeat-like-containing domain superfamily / Cullin protein, neddylation domain / Cullin ...Zinc finger, RING-H2-type / RING-H2 zinc finger domain / Cullin protein neddylation domain / : / Cullin, N-terminal / Cullin, conserved site / Cullin family signature. / Cullin repeat-like-containing domain superfamily / Cullin protein, neddylation domain / Cullin / Cullin protein neddylation domain / Cullin alpha solenoid domain / Cullin / : / Cullin alpha+beta domain / 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)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.91 Å
AuthorsMullins, E.A. / Schiltz, C.J. / Eichman, B.F.
Funding support United States, 2items
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, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 28, 2026Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
C: Cullin-1
R: E3 ubiquitin-protein ligase RBX1


Theoretical massNumber of molelcules
Total (without water)102,0902
Polymers102,0902
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 Cullin-1 / CUL-1


Mass: 89800.305 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
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

Component
IDNameTypeEntity IDParent-IDSource
1Heterotetrameric SCF-FBH1 protein complex bound to a 3-way DNA forkCOMPLEXall0MULTIPLE SOURCES
2Heterotetrameric SCF-FBH1 protein complexCOMPLEXall1RECOMBINANT
33-way DNA forkCOMPLEX1NATURAL
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
32Homo sapiens (human)9606
43synthetic construct (others)32630
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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recording
IDImaging-IDElectron dose (e/Å2)Film or detector model
1151.8GATAN K3 BIOQUANTUM (6k x 4k)
2154.5GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM software
IDNameCategory
1Topazparticle selection
2cryoSPARCparticle selection
3EPUimage acquisition
5cryoSPARCCTF correction
8UCSF ChimeraXmodel fitting
10cryoSPARCinitial Euler assignment
11RELIONfinal Euler assignment
12RELIONclassification
13RELION3D reconstruction
14Cootmodel refinement
15PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.91 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 156479 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT
Atomic model buildingPDB-ID: 1LDK

1ldk


Accession code: 1LDK / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0034050
ELECTRON MICROSCOPYf_angle_d0.4095453
ELECTRON MICROSCOPYf_dihedral_angle_d8.9971546
ELECTRON MICROSCOPYf_chiral_restr0.034614
ELECTRON MICROSCOPYf_plane_restr0.002696

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