[English] 日本語
Yorodumi
- PDB-9out: SPOP double donut locally refined MATH domains -

+
Open data


ID or keywords:

Loading...

-
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.
HIGHLIGHTS: SPOP assemblies exist in an equilibrium between circular double donuts and linear filaments.Double donuts occlude access to the substrate binding site and are inactive.Mutations in ...HIGHLIGHTS: SPOP assemblies exist in an equilibrium between circular double donuts and linear filaments.Double donuts occlude access to the substrate binding site and are inactive.Mutations in different cancers shift the equilibrium towards active or inactive states.Regulation through these structural transitions requires large filamentous assemblies.
History
DepositionMay 29, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 30, 2025Provider: repository / Type: Initial release

-
Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

-
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

-
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

-
Experimental details

-
Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

-
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

-
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)

-
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

+
About Yorodumi

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi

Thousand views of thousand structures

  • Yorodumi is a browser for structure data from EMDB, PDB, SASBDB, etc.
  • This page is also the successor to EM Navigator detail page, and also detail information page/front-end page for Omokage search.
  • The word "yorodu" (or yorozu) is an old Japanese word meaning "ten thousand". "mi" (miru) is to see.

Related info.:EMDB / PDB / SASBDB / Comparison of 3 databanks / Yorodumi Search / Aug 31, 2016. New EM Navigator & Yorodumi / Yorodumi Papers / Jmol/JSmol / Function and homology information / Changes in new EM Navigator and Yorodumi

Read more