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- PDB-9eo1: Cryo_EM structure of human FAN1 in complex with 5' flap DNA substrate -

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Basic information

Entry
Database: PDB / ID: 9eo1
TitleCryo_EM structure of human FAN1 in complex with 5' flap DNA substrate
Components
  • DNA (continuous)
  • DNA (post-nick)
  • DNA (pre-nick)
  • Fanconi-associated nuclease 1
KeywordsDNA BINDING PROTEIN / FAN1
Function / homology
Function and homology information


flap-structured DNA binding / phosphodiesterase I / 5'-flap endonuclease activity / Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters / ubiquitin-modified protein reader activity / 5'-3' exonuclease activity / phosphodiesterase I activity / interstrand cross-link repair / intercellular bridge / nucleotide-excision repair ...flap-structured DNA binding / phosphodiesterase I / 5'-flap endonuclease activity / Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters / ubiquitin-modified protein reader activity / 5'-3' exonuclease activity / phosphodiesterase I activity / interstrand cross-link repair / intercellular bridge / nucleotide-excision repair / Fanconi Anemia Pathway / double-strand break repair via homologous recombination / cilium / DNA repair / magnesium ion binding / zinc ion binding / nucleoplasm / nucleus / cytosol
Similarity search - Function
: / : / : / Fanconi-associated nuclease 1, SAP subdomain / Fanconi-associated nuclease 1, TPR domain / Fanconi-associated nuclease 1-like / : / FAN1, HTH domain / VRR-NUC domain / VRR-NUC domain ...: / : / : / Fanconi-associated nuclease 1, SAP subdomain / Fanconi-associated nuclease 1, TPR domain / Fanconi-associated nuclease 1-like / : / FAN1, HTH domain / VRR-NUC domain / VRR-NUC domain / VRR_NUC / Rad18-like CCHC zinc finger / tRNA endonuclease-like domain superfamily / Rad18, zinc finger UBZ4-type / Zinc finger UBZ4-type profile.
Similarity search - Domain/homology
DNA / DNA (> 10) / Fanconi-associated nuclease 1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsJeyasankar, G. / Salerno-Kochan, A. / Thomsen, M.
Funding support United States, 1items
OrganizationGrant numberCountry
CHDI Foundation United States
Citation
Journal: Nat Commun / Year: 2025
Title: A FAN1 point mutation associated with accelerated Huntington's disease progression alters its PCNA-mediated assembly on DNA.
Authors: Jonas Aretz / Gayathri Jeyasankar / Anna Salerno-Kochan / Maren Thomsen / Gabriel Thieulin-Pardo / Tasir Haque / Edith Monteagudo / Dan Felsenfeld / Michael Finley / Thomas F Vogt / Julien ...Authors: Jonas Aretz / Gayathri Jeyasankar / Anna Salerno-Kochan / Maren Thomsen / Gabriel Thieulin-Pardo / Tasir Haque / Edith Monteagudo / Dan Felsenfeld / Michael Finley / Thomas F Vogt / Julien Boudet / Brinda C Prasad /
Abstract: FAN1 is an endo- and exo-nuclease involved in DNA and interstrand crosslink repair. Genome-wide association studies of people with Huntington's disease revealed a strong association between the FAN1 ...FAN1 is an endo- and exo-nuclease involved in DNA and interstrand crosslink repair. Genome-wide association studies of people with Huntington's disease revealed a strong association between the FAN1 R507H mutation and early disease onset, however the underlying mechanism(s) remains unclear. FAN1 has previously been implicated in modulating triplet repeat expansion in a PCNA dependent manner. To examine the role of PCNA on FAN1 activation, we solved the cryo-EM structures of a PCNA-FAN1-DNA complex. Our findings reveal that the FAN1 R507 residue directly interacts with PCNA D232. Biophysical interaction studies demonstrated that FAN1 enhances the binding affinity of PCNA for DNA, a synergistic effect disrupted in mutants carrying the R507H mutation. In contrast, PCNA does not affect the affinity of FAN1 for DNA but does modulate FAN1 activity upon ternary complex formation. The weakened and functionally altered FAN1 R507H-PCNA-DNA complex may partly impair the FAN1-mediated repair of CAG extrahelical extrusions, providing a potential explanation for the mutation's role in accelerating disease progression.
#1: Journal: Biorxiv / Year: 2024
Title: A FAN1 point mutation associated with accelerated Huntington's disease progression alters its PCNA-mediated assembly on DNA
Authors: Aretz, J. / Jeyasankar, G. / Salerno-Kochan, A. / Thomsen, M. / Thieulin-Pardo, G. / Haque, T. / Monteagudo, E. / Felsenfeld, D. / Finley, M. / Vogt, T.F. / Boudet, J. / Prasad, B.C.
History
DepositionMar 14, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jan 29, 2025Provider: repository / Type: Initial release
Revision 1.1May 28, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin / Item: _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Fanconi-associated nuclease 1
B: DNA (continuous)
C: DNA (pre-nick)
D: DNA (post-nick)


Theoretical massNumber of molelcules
Total (without water)91,9594
Polymers91,9594
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 Fanconi-associated nuclease 1 / FANCD2/FANCI-associated nuclease 1 / hFAN1 / Myotubularin-related protein 15


Mass: 72629.703 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FAN1, KIAA1018, MTMR15 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: Q9Y2M0, Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters, phosphodiesterase I
#2: DNA chain DNA (continuous)


Mass: 9731.217 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm)
#3: DNA chain DNA (pre-nick)


Mass: 4320.815 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm)
#4: DNA chain DNA (post-nick)


Mass: 5277.423 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm)
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
1FAN1-DNA complexCOMPLEXall0MULTIPLE SOURCES
2FAN1COMPLEX#11RECOMBINANT
3DNACOMPLEX#2-#41RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Homo sapiens (human)9606
33Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
22Spodoptera frugiperda (fall armyworm)7108
33synthetic construct (others)32630
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 379066 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0046209
ELECTRON MICROSCOPYf_angle_d0.6538664
ELECTRON MICROSCOPYf_dihedral_angle_d25.9441293
ELECTRON MICROSCOPYf_chiral_restr0.039970
ELECTRON MICROSCOPYf_plane_restr0.004883

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