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- PDB-9og9: Cryo-EM structure of human full-length XPO1 (unliganded) -

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Basic information

Entry
Database: PDB / ID: 9og9
TitleCryo-EM structure of human full-length XPO1 (unliganded)
ComponentsExportin-1
KeywordsPROTEIN TRANSPORT / nuclear export / HEAT repeat
Function / homology
Function and homology information


cellular response to triglyceride / cellular response to salt / HuR (ELAVL1) binds and stabilizes mRNA / annulate lamellae / regulation of proteasomal ubiquitin-dependent protein catabolic process / nuclear export signal receptor activity / Rev-mediated nuclear export of HIV RNA / NEP/NS2 Interacts with the Cellular Export Machinery / nucleocytoplasmic transport / Maturation of DENV proteins ...cellular response to triglyceride / cellular response to salt / HuR (ELAVL1) binds and stabilizes mRNA / annulate lamellae / regulation of proteasomal ubiquitin-dependent protein catabolic process / nuclear export signal receptor activity / Rev-mediated nuclear export of HIV RNA / NEP/NS2 Interacts with the Cellular Export Machinery / nucleocytoplasmic transport / Maturation of DENV proteins / Maturation of hRSV A proteins / Estrogen-dependent nuclear events downstream of ESR-membrane signaling / ribosomal large subunit export from nucleus / Cajal body / ribosomal subunit export from nucleus / mRNA export from nucleus / Cyclin A/B1/B2 associated events during G2/M transition / NPAS4 regulates expression of target genes / protein export from nucleus / ribosomal small subunit export from nucleus / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / Transcriptional and post-translational regulation of MITF-M expression and activity / Mitotic Prometaphase / EML4 and NUDC in mitotic spindle formation / Resolution of Sister Chromatid Cohesion / Downregulation of TGF-beta receptor signaling / Heme signaling / Deactivation of the beta-catenin transactivating complex / RHO GTPases Activate Formins / MAPK6/MAPK4 signaling / small GTPase binding / kinetochore / Separation of Sister Chromatids / nuclear envelope / ribosome biogenesis / DNA-binding transcription factor binding / response to xenobiotic stimulus / ribonucleoprotein complex / protein domain specific binding / nucleolus / negative regulation of transcription by RNA polymerase II / protein-containing complex / RNA binding / nucleoplasm / membrane / nucleus / cytosol / cytoplasm
Similarity search - Function
Exportin-1, repeat 3 / Chromosome region maintenance repeat / Exportin-1, repeat 2 / Chromosome region maintenance or exportin repeat / CRM1 / Exportin repeat 2 / CRM1 / Exportin repeat 3 / CRM1 C terminal / Exportin-1, C-terminal / CRM1 C terminal / Exportin-1/5 ...Exportin-1, repeat 3 / Chromosome region maintenance repeat / Exportin-1, repeat 2 / Chromosome region maintenance or exportin repeat / CRM1 / Exportin repeat 2 / CRM1 / Exportin repeat 3 / CRM1 C terminal / Exportin-1, C-terminal / CRM1 C terminal / Exportin-1/5 / Exportin-1/Importin-beta-like / Exportin 1-like protein / Importin-beta N-terminal domain / Importin-beta N-terminal domain / Importin-beta N-terminal domain profile. / Importin-beta, N-terminal domain / Armadillo-like helical / Armadillo-type fold
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.93 Å
AuthorsWing, C.E. / Fung, H.Y.J. / Chook, Y.M.
Funding support United States, 7items
OrganizationGrant numberCountry
Cancer Prevention and Research Institute of Texas (CPRIT)RP220582 United States
Cancer Prevention and Research Institute of Texas (CPRIT)RP180410 United States
Cancer Prevention and Research Institute of Texas (CPRIT)RP150053 United States
Cancer Prevention and Research Institute of Texas (CPRIT)RP170170 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM144137 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)T32GM131963 United States
Welch FoundationI-1532 United States
CitationJournal: Nat Chem Biol / Year: 2025
Title: SINE compounds activate exportin 1 degradation through an allosteric mechanism.
Authors: Casey E Wing / Ho Yee Joyce Fung / Bert Kwanten / Tolga Cagatay / Ashley B Niesman / Maarten Jacquemyn / Mehdi Gharghabi / Brecht Permentier / Binita Shakya / Rhituparna Nandi / Joseph M ...Authors: Casey E Wing / Ho Yee Joyce Fung / Bert Kwanten / Tolga Cagatay / Ashley B Niesman / Maarten Jacquemyn / Mehdi Gharghabi / Brecht Permentier / Binita Shakya / Rhituparna Nandi / Joseph M Ready / Trinayan Kashyap / Sharon Shacham / Yosef Landesman / Rosa Lapalombella / Dirk Daelemans / Yuh Min Chook /
Abstract: Overexpression of exportin 1 (XPO1/CRM1) in cancer cells mislocalizes numerous cancer-related nuclear export cargoes. Covalent selective inhibitors of nuclear export (SINEs), including the cancer ...Overexpression of exportin 1 (XPO1/CRM1) in cancer cells mislocalizes numerous cancer-related nuclear export cargoes. Covalent selective inhibitors of nuclear export (SINEs), including the cancer drug selinexor, restore proper nuclear localization by blocking XPO1-cargo interaction. These inhibitors also induce XPO1 degradation through the Cullin-RING E3 ligase (CRL) substrate receptor ASB8. Here we present cryo-electron microscopy structures revealing ASB8 binding to a cryptic XPO1 site that is exposed upon SINE conjugation. Unlike typical molecular glue degraders that directly bridge CRLs and substrates, SINEs bind XPO1 independently of ASB8, triggering an allosteric mechanism that enables high-affinity ASB8 recruitment, leading to XPO1 ubiquitination and degradation. ASB8-mediated degradation is also triggered by the endogenous itaconate derivative 4-octyl itaconate, suggesting that synthetic XPO1 inhibitors exploit a native cellular mechanism. This allosteric XPO1 degradation mechanism expands known modes of targeted protein degradation beyond molecular glue degraders and proteolysis-targeting chimeras of CRL4.
History
DepositionApr 30, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 26, 2025Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Exportin-1


Theoretical massNumber of molelcules
Total (without water)123,6621
Polymers123,6621
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 Exportin-1 / Exp1 / Chromosome region maintenance 1 protein homolog


Mass: 123662.484 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: GS remaining after TEV cleavage / Source: (gene. exp.) Homo sapiens (human) / Gene: XPO1, CRM1 / Plasmid: pGEX4TT3 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: O14980
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: Human full-length unliganded exportin-1 (XPO1) / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.123 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: BL21(DE3) / Plasmid: pGEX4TT3
Buffer solutionpH: 7.4
Details: 20 mM HEPES pH 7.4, 110 mM KOAc, 2 mM Mg(OAc)2, 2 mM TCEP
SpecimenConc.: 3.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 377 K

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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: 165000 X / Nominal defocus max: 2200 nm / Nominal defocus min: 900 nm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 60 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 8568
EM imaging opticsEnergyfilter name: TFS Selectris X / Energyfilter slit width: 10 eV

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2Topazparticle selection
3SerialEMimage acquisition
5cryoSPARCCTF correction
8UCSF ChimeraXmodel fitting
9ISOLDEmodel fitting
10Cootmodel fitting
12cryoSPARCinitial Euler assignment
13cryoSPARCfinal Euler assignment
14cryoSPARCclassification
15cryoSPARC3D reconstruction
16PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1245354 / Details: blob picking followed by Topaz picking
3D reconstructionResolution: 2.93 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 365756 / Symmetry type: POINT
Atomic model buildingB value: 124.05 / Protocol: OTHER / Space: REAL
Details: Initial model was docked into maps using UCSF ChimeraX then manually built using Isolde and Coot and refined in PHENIX
Atomic model buildingPDB-ID: 3GB8

3gb8


Pdb chain-ID: A / Accession code: 3GB8 / Source name: PDB / Type: experimental model
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 124.05 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00237472
ELECTRON MICROSCOPYf_angle_d0.464410124
ELECTRON MICROSCOPYf_chiral_restr0.03481164
ELECTRON MICROSCOPYf_plane_restr0.00331293
ELECTRON MICROSCOPYf_dihedral_angle_d3.5521957

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