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Open data
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Basic information
Entry | ![]() | |||||||||
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Title | Preholo-Proteasome from Beta 3 D205 deletion | |||||||||
![]() | Beta3 D205 deletion Preholo-Proteasome | |||||||||
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![]() | Proteasome / core particle / HYDROLASE | |||||||||
Function / homology | ![]() regulation of proteasome core complex assembly / proteasome core complex assembly / nuclear outer membrane-endoplasmic reticulum membrane network / Cross-presentation of soluble exogenous antigens (endosomes) / TNFR2 non-canonical NF-kB pathway / proteasomal ubiquitin-independent protein catabolic process / Ubiquitin Mediated Degradation of Phosphorylated Cdc25A / Regulation of PTEN stability and activity / KEAP1-NFE2L2 pathway / CDK-mediated phosphorylation and removal of Cdc6 ...regulation of proteasome core complex assembly / proteasome core complex assembly / nuclear outer membrane-endoplasmic reticulum membrane network / Cross-presentation of soluble exogenous antigens (endosomes) / TNFR2 non-canonical NF-kB pathway / proteasomal ubiquitin-independent protein catabolic process / Ubiquitin Mediated Degradation of Phosphorylated Cdc25A / Regulation of PTEN stability and activity / KEAP1-NFE2L2 pathway / CDK-mediated phosphorylation and removal of Cdc6 / Neddylation / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / Orc1 removal from chromatin / MAPK6/MAPK4 signaling / proteasome storage granule / Antigen processing: Ubiquitination & Proteasome degradation / endopeptidase activator activity / proteasome assembly / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / proteasome core complex, alpha-subunit complex / threonine-type endopeptidase activity / Ub-specific processing proteases / Neutrophil degranulation / proteasome complex / ubiquitin-dependent protein catabolic process / proteasome-mediated ubiquitin-dependent protein catabolic process / endopeptidase activity / mRNA binding / DNA damage response / endoplasmic reticulum membrane / mitochondrion / nucleus / cytoplasm / cytosol Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.8 Å | |||||||||
![]() | Walsh Jr RM / Rawson S / Velez B / Blickling M / Razi A / Hanna J | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Mechanism of autocatalytic activation during proteasome assembly. Authors: Benjamin Velez / Richard M Walsh / Shaun Rawson / Aida Razi / Lea Adams / Erignacio Fermin Perez / Fenglong Jiao / Marie Blickling / Tamayanthi Rajakumar / Darlene Fung / Lan Huang / John Hanna / ![]() Abstract: Many large molecular machines are too elaborate to assemble spontaneously and are built through ordered pathways orchestrated by dedicated chaperones. During assembly of the core particle (CP) of the ...Many large molecular machines are too elaborate to assemble spontaneously and are built through ordered pathways orchestrated by dedicated chaperones. During assembly of the core particle (CP) of the proteasome, where protein degradation occurs, its six active sites are simultaneously activated via cleavage of N-terminal propeptides. Such activation is autocatalytic and coupled to fusion of two half-CP intermediates, which protects cells by preventing activation until enclosure of the active sites within the CP interior. Here we uncover key mechanistic aspects of autocatalytic activation, which proceeds through alignment of the β5 and β2 catalytic triad residues, respectively, with these triads being misaligned before fusion. This mechanism contrasts with most other zymogens, in which catalytic centers are preformed. Our data also clarify the mechanism by which individual subunits can be added in a precise, temporally ordered manner. This work informs two decades-old mysteries in the proteasome field, with broader implications for protease biology and multisubunit complex assembly. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
Map data | ![]() | 159.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 37 KB 37 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 11.6 KB | Display | ![]() |
Images | ![]() | 58.8 KB | ||
Filedesc metadata | ![]() | 9.5 KB | ||
Others | ![]() ![]() | 157.1 MB 157.1 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 20.3 KB | Display | |
Data in CIF | ![]() | 26.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8u6yMC ![]() 8u7uC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||
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Annotation | Beta3 D205 deletion Preholo-Proteasome | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.06 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: Half Map A Beta3 D205 deletion Preholo-Proteasome
File | emd_41963_half_map_1.map | ||||||||||||
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Annotation | Half Map A Beta3 D205 deletion Preholo-Proteasome | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half Map B Beta3 D205 deletion Preholo-Proteasome
File | emd_41963_half_map_2.map | ||||||||||||
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Annotation | Half Map B Beta3 D205 deletion Preholo-Proteasome | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
+Entire : Preholo-proteasome from Beta 3 D205 deletion mutant
+Supramolecule #1: Preholo-proteasome from Beta 3 D205 deletion mutant
+Macromolecule #1: Proteasome subunit alpha type-1
+Macromolecule #2: Proteasome subunit alpha type-2
+Macromolecule #3: Proteasome subunit alpha type-3
+Macromolecule #4: Proteasome subunit alpha type-4
+Macromolecule #5: Proteasome subunit alpha type-5
+Macromolecule #6: Proteasome subunit alpha type-6
+Macromolecule #7: Proteasome subunit alpha type-7
+Macromolecule #8: Proteasome maturation factor UMP1
+Macromolecule #9: Proteasome subunit beta type-2
+Macromolecule #10: Proteasome subunit beta type-3
+Macromolecule #11: Proteasome subunit beta type-4
+Macromolecule #12: Proteasome subunit beta type-5
+Macromolecule #13: Proteasome subunit beta type-6
+Macromolecule #14: Proteasome subunit beta type-1
+Macromolecule #15: Proteasome chaperone 1
+Macromolecule #16: Proteasome assembly chaperone 2
+Macromolecule #17: Proteasome subunit beta type-7
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 4.48 mg/mL | ||||||||||||
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Buffer | pH: 7.5 Component:
Details: Fluorinated Fos-Choline was added immediately prior to deposition on a grid for plunge freezing. | ||||||||||||
Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.039 kPa | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295.15 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Specialist optics | Energy filter - Name: GIF Bioquantum / Energy filter - Slit width: 25 eV |
Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Number real images: 7461 / Average exposure time: 3.995 sec. / Average electron dose: 57.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 50.0 µm / Calibrated magnification: 47169 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 81000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |