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Yorodumi- PDB-10mt: C2 symmetry expanded and subtracted 20S Proteasome, Blm10, Fub1 C... -
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Open data
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Basic information
| Entry | Database: PDB / ID: 10mt | |||||||||||||||||||||||||||
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| Title | C2 symmetry expanded and subtracted 20S Proteasome, Blm10, Fub1 Complex Halfmer | |||||||||||||||||||||||||||
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Keywords | HYDROLASE / 20S Proteasome / Proteasome Regulator / Proteasome Inhibitor | |||||||||||||||||||||||||||
| Function / homology | Function and homology informationproteasome core complex import into nucleus / proteasome storage granule assembly / ER-Phagosome pathway / Antigen processing: Ub, ATP-independent proteasomal degradation / proteasome core complex assembly / nuclear outer membrane-endoplasmic reticulum membrane network / Cross-presentation of soluble exogenous antigens (endosomes) / TNFR2 non-canonical NF-kB pathway / Proteasome assembly / Ub-specific processing proteases ...proteasome core complex import into nucleus / proteasome storage granule assembly / ER-Phagosome pathway / Antigen processing: Ub, ATP-independent proteasomal degradation / proteasome core complex assembly / nuclear outer membrane-endoplasmic reticulum membrane network / Cross-presentation of soluble exogenous antigens (endosomes) / TNFR2 non-canonical NF-kB pathway / Proteasome assembly / Ub-specific processing proteases / peptidase activator activity / proteasome binding / proteasomal ubiquitin-independent protein catabolic process / proteasome storage granule / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / endopeptidase activator activity / threonine-type endopeptidase activity / proteasome core complex, alpha-subunit complex / proteasome assembly / Neutrophil degranulation / regulation of proteasomal protein catabolic process / peroxisome / chromatin organization / endopeptidase activity / proteasome-mediated ubiquitin-dependent protein catabolic process / DNA repair / mRNA binding / DNA damage response / endoplasmic reticulum membrane / mitochondrion / identical protein binding / nucleus / cytosol Similarity search - Function | |||||||||||||||||||||||||||
| Biological species | ![]() | |||||||||||||||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å | |||||||||||||||||||||||||||
Authors | Walsh Jr, R.M. / Rawson, S. / Fermin Perez, E. / Venclovaite, U. / Hanna, J. | |||||||||||||||||||||||||||
| Funding support | United States, 1items
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Citation | Journal: Proc Natl Acad Sci U S A / Year: 2026Title: Blm10 and PI31 comprise a failsafe mechanism for proteasome inhibition. Authors: Darlene Fung / Shaun Rawson / Richard M Walsh / Erignacio Fermin Perez / Urte Venclovaite / Tamayanthi Rajakumar / Benjamin Velez / John Hanna / ![]() Abstract: Blm10 (PA200 in mammals) is an evolutionarily conserved regulator of the proteasome's core particle (CP), a barrel-shaped complex that houses six individual protease subunits. Despite decades of ...Blm10 (PA200 in mammals) is an evolutionarily conserved regulator of the proteasome's core particle (CP), a barrel-shaped complex that houses six individual protease subunits. Despite decades of study, Blm10's function has remained unresolved. Here, we provide structural, biochemical, and genetic evidence that yeast Blm10 inhibits the proteasome and that it does so in cooperation with a second proteasome inhibitor, PI31 (also known as Fub1). Both proteins are highly enriched in CPs with abnormal subunit composition, suggesting that Blm10 and PI31 may function to neutralize aberrant proteasomes. We report an unexpected proteasome configuration in which Blm10's dome-like structure completely encases PI31's N-terminal domain, which sits outside and atop the CP, while PI31's C-terminal domain is present inside the CP, simultaneously inhibiting all six active sites. These Blm10/PI31-bound CP are strongly deficient in degradation of both proteins and small peptides, and loss of both proteins results in strongly synergistic genetic phenotypes in vivo. These data suggest that Blm10 and PI31 constitute a partially redundant failsafe system for proteasome inhibition. | |||||||||||||||||||||||||||
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Structure visualization
| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 10mt.cif.gz | 1.9 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb10mt.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 10mt.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/0m/10mt ftp://data.pdbj.org/pub/pdb/validation_reports/0m/10mt | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 75294MC ![]() 10gxC ![]() 10ogC ![]() 10qtC ![]() 10sjC C: citing same article ( M: map data used to model this data |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
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Assembly
| Deposited unit | ![]()
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Components
-Proteasome subunit alpha type- ... , 6 types, 7 molecules ABFGCDE
| #1: Protein | Mass: 28033.830 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: Proteasome subunit alpha type-1 / Source: (natural) ![]() References: UniProt: P21243, proteasome endopeptidase complex | ||
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| #2: Protein | Mass: 27191.828 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P23639, proteasome endopeptidase complex | ||
| #3: Protein | Mass: 25634.000 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P40302, proteasome endopeptidase complex | ||
| #4: Protein | Mass: 31575.068 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P21242, proteasome endopeptidase complex | ||
| #12: Protein | Mass: 28478.111 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P40303, proteasome endopeptidase complex #14: Protein | | Mass: 28649.086 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P32379, proteasome endopeptidase complex |
-Proteasome subunit beta type- ... , 7 types, 7 molecules HIJKLMN
| #5: Protein | Mass: 23573.604 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P38624, proteasome endopeptidase complex |
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| #6: Protein | Mass: 28299.889 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P25043, proteasome endopeptidase complex |
| #7: Protein | Mass: 22627.842 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P25451, proteasome endopeptidase complex |
| #8: Protein | Mass: 22545.676 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P22141, proteasome endopeptidase complex |
| #9: Protein | Mass: 31670.539 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P30656, proteasome endopeptidase complex |
| #10: Protein | Mass: 26905.076 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P23724, proteasome endopeptidase complex |
| #11: Protein | Mass: 29471.289 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P30657, proteasome endopeptidase complex |
-Protein , 2 types, 3 molecules CAab
| #13: Protein | Mass: 249243.672 Da / Num. of mol.: 1 / Source method: isolated from a natural source Details: MHHHHHHHHHHHHTANNDDDIKSP Sequence added on for His Tag. Source: (natural) ![]() |
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| #15: Protein | Mass: 26780.809 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Details
| Has protein modification | N |
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-Experimental details
-Experiment
| Experiment | Method: ELECTRON MICROSCOPY |
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| EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
| Component | Name: C2 symmetry expanded and subtracted 20S Proteasome, Blm10, Fub1 Complex Halfmer Type: COMPLEX / Entity ID: all / Source: NATURAL | ||||||||||||||||||||
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| Molecular weight | Value: 0.240 MDa / Experimental value: NO | ||||||||||||||||||||
| Source (natural) | Organism: ![]() | ||||||||||||||||||||
| Buffer solution | pH: 7.5 Details: Sample was mixed with RvLEAMshort peptide to a final concentration of 1mg/ml sample and 30 micromolar RvLEAMshort immediately before preparation. | ||||||||||||||||||||
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| Specimen | Conc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES Details: Sample was mixed with RvLEAMshort peptide to a final concentration of 1mg/ml sample and 30 micromolar RvLEAMshort immediately before preparation. | ||||||||||||||||||||
| Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil | ||||||||||||||||||||
| Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295.15 K Details: wait time of 8 s, blot time of 12 s and a blot force of 8 |
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Electron microscopy imaging
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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| Microscopy | Model: TFS KRIOS |
| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 600 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE |
| Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
| Image recording | Average exposure time: 6.32 sec. / Electron dose: 50.253 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 11278 |
| EM imaging optics | Energyfilter name: TFS Selectris / Energyfilter slit width: 10 eV |
| Image scans | Width: 4096 / Height: 4096 |
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Processing
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||
| Particle selection | Num. of particles selected: 2419467 | ||||||||||||||||||||||||||||||||
| Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||
| 3D reconstruction | Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 37111 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||
| Atomic model building | Protocol: FLEXIBLE FIT / Space: REAL | ||||||||||||||||||||||||||||||||
| Atomic model building | Details: Model Angelo generated / Source name: Other / Type: experimental model | ||||||||||||||||||||||||||||||||
| Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||||||||||
| Displacement parameters | Biso mean: 98.63 Å2 | ||||||||||||||||||||||||||||||||
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FIELD EMISSION GUN