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- PDB-9out: SPOP double donut locally refined MATH domains -

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Basic information

Entry
Database: PDB / ID: 9out
TitleSPOP double donut locally refined MATH domains
ComponentsSpeckle-type POZ protein
KeywordsPROTEIN BINDING / ubiquitination / protein degradation / protein oligomer / substrate adapter
Function / homology
Function and homology information


molecular function inhibitor activity / Cul3-RING ubiquitin ligase complex / regulation of proteolysis / Hedgehog 'on' state / protein polyubiquitination / proteasome-mediated ubiquitin-dependent protein catabolic process / nuclear speck / ubiquitin protein ligase binding / nucleoplasm / identical protein binding ...molecular function inhibitor activity / Cul3-RING ubiquitin ligase complex / regulation of proteolysis / Hedgehog 'on' state / protein polyubiquitination / proteasome-mediated ubiquitin-dependent protein catabolic process / nuclear speck / ubiquitin protein ligase binding / nucleoplasm / identical protein binding / nucleus / cytoplasm
Similarity search - Function
SPOP, C-terminal BACK domain / : / BPM/SPOP, BACK domain / MATH domain / MATH/TRAF domain / MATH/TRAF domain profile. / meprin and TRAF homology / TRAF-like / BTB/POZ domain / BTB domain profile. ...SPOP, C-terminal BACK domain / : / BPM/SPOP, BACK domain / MATH domain / MATH/TRAF domain / MATH/TRAF domain profile. / meprin and TRAF homology / TRAF-like / BTB/POZ domain / BTB domain profile. / Broad-Complex, Tramtrack and Bric a brac / BTB/POZ domain / SKP1/BTB/POZ domain superfamily
Similarity search - Domain/homology
Speckle-type POZ protein
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsCuneo, M.J.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
CitationJournal: bioRxiv / Year: 2025
Title: The equilibrium between two quaternary assembly states determines the activity of SPOP and its cancer mutants.
Authors: Matthew J Cuneo / Ömer Güllülü / Mohamed-Raafet Ammar / Xinrui Gui / Kelly Churion / Martin Turk / Brian G O'Flynn / Nafiseh Sabri / Tanja Mittag /
Abstract: Proteostasis is critical for preventing oncogenesis. Both activating and inactivating mutations in the ubiquitin ligase subunit SPOP result in oncogenesis in different tissues. SPOP assembles into ...Proteostasis is critical for preventing oncogenesis. Both activating and inactivating mutations in the ubiquitin ligase subunit SPOP result in oncogenesis in different tissues. SPOP assembles into filaments that are multivalent for substrates, and substrates have multiple weak motifs for SPOP that are not activated via post-translational modifications. It is thus unclear how regulation is achieved. Here, we show that SPOP filaments circularize into rings that dimerize into up to 2.5 MDa-large, auto-inhibited double donuts. The equilibrium between double donuts and linear filaments determines SPOP activity. Activating and deactivating cancer mutations shift the equilibrium towards the filament or the double donut, respectively, and this influences substrate turnover and subcellular localization. This regulatory mechanism requires long filaments that can circularize into rings, likely explaining the presence of multiple weak SPOP-binding motifs in substrates. Activating and deactivating mutations combine to give rise to intermediate activities, suggesting new levers for cancer therapies.
History
DepositionMay 29, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 30, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
C: Speckle-type POZ protein
D: Speckle-type POZ protein
H: Speckle-type POZ protein
I: Speckle-type POZ protein
J: Speckle-type POZ protein
M: Speckle-type POZ protein
N: Speckle-type POZ protein
A: Speckle-type POZ protein
B: Speckle-type POZ protein
E: Speckle-type POZ protein
F: Speckle-type POZ protein
G: Speckle-type POZ protein
K: Speckle-type POZ protein
L: Speckle-type POZ protein
P: Speckle-type POZ protein


Theoretical massNumber of molelcules
Total (without water)632,75015
Polymers632,75015
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
Speckle-type POZ protein / HIB homolog 1 / Roadkill homolog 1


Mass: 42183.355 Da / Num. of mol.: 15
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SPOP / Production host: Escherichia coli (E. coli) / References: UniProt: O43791
Has protein modificationY

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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: SPOP double donut locally-refined MATH domains / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
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 defocus max: 2800 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 1 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.21_5207 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 420000 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 223.43 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.003837266
ELECTRON MICROSCOPYf_angle_d0.861950234
ELECTRON MICROSCOPYf_chiral_restr0.0525514
ELECTRON MICROSCOPYf_plane_restr0.00486442
ELECTRON MICROSCOPYf_dihedral_angle_d5.51374892

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