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- EMDB-4127: Cryo-EM reconstruction of the Bacterial proteasome interactor (Bp... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-4127 | |||||||||
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Title | Cryo-EM reconstruction of the Bacterial proteasome interactor (Bpa) bound to the 20S proteasome of M. tuberculosis. | |||||||||
![]() | bacterial proteasome activator bound to bacterial proteasome reconstructed without applied symmetry | |||||||||
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Function / homology | ![]() symbiont-mediated perturbation of host defenses / proteasome accessory complex / positive regulation of proteasomal protein catabolic process / zymogen binding / proteasome binding / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / proteasome core complex, alpha-subunit complex / threonine-type endopeptidase activity / proteasomal protein catabolic process ...symbiont-mediated perturbation of host defenses / proteasome accessory complex / positive regulation of proteasomal protein catabolic process / zymogen binding / proteasome binding / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / proteasome core complex, alpha-subunit complex / threonine-type endopeptidase activity / proteasomal protein catabolic process / peptidoglycan-based cell wall / proteolysis involved in protein catabolic process / protein homooligomerization / modification-dependent protein catabolic process / proteasome-mediated ubiquitin-dependent protein catabolic process / extracellular region / plasma membrane / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 4.6 Å | |||||||||
![]() | Bolten M / Delley CL / Leibundgut M / Boehringer D / Ban N / Weber-Ban E | |||||||||
![]() | ![]() Title: Structural Analysis of the Bacterial Proteasome Activator Bpa in Complex with the 20S Proteasome. Authors: Marcel Bolten / Cyrille L Delley / Marc Leibundgut / Daniel Boehringer / Nenad Ban / Eilika Weber-Ban / ![]() Abstract: Mycobacterium tuberculosis harbors proteasomes that recruit substrates for degradation through an ubiquitin-like modification pathway. Recently, a non-ATPase activator termed Bpa (bacterial ...Mycobacterium tuberculosis harbors proteasomes that recruit substrates for degradation through an ubiquitin-like modification pathway. Recently, a non-ATPase activator termed Bpa (bacterial proteasome activator) was shown to support an alternate proteasomal degradation pathway. Here, we present the cryo-electron microscopy (cryo-EM) structure of Bpa in complex with the 20S core particle (CP). For docking into the cryo-EM density, we solved the X-ray structure of Bpa, showing that it forms tight four-helix bundles arranged into a 12-membered ring with a 40 Å wide central pore and the C-terminal helix of each protomer protruding from the ring. The Bpa model was fitted into the cryo-EM map of the Bpa-CP complex, revealing its architecture and striking symmetry mismatch. The Bpa-CP interface was resolved to 3.5 Å, showing the interactions between the C-terminal GQYL motif of Bpa and the proteasome α-rings. This docking mode is related to the one observed for eukaryotic activators with features specific to the bacterial complex. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 200.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 12.5 KB 12.5 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 13.3 KB | Display | ![]() |
Images | ![]() | 153 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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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 | bacterial proteasome activator bound to bacterial proteasome reconstructed without applied symmetry | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.4 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : proteasome in complex with bacterial proteasome activator
Entire | Name: proteasome in complex with bacterial proteasome activator |
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Components |
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-Supramolecule #1: proteasome in complex with bacterial proteasome activator
Supramolecule | Name: proteasome in complex with bacterial proteasome activator type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7 |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() ![]() |
Molecular weight | Theoretical: 930 KDa |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.102 mg/mL | |||||||||
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Buffer | pH: 7.5 Component:
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Grid | Model: Quantifoil R2/2 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: OTHER Details: Quantifoil R 2/2 with an additional thin carbon layer | |||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 280.5 K / Instrument: FEI VITROBOT MARK I |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: FEI FALCON II (4k x 4k) / Detector mode: INTEGRATING / Digitization - Sampling interval: 14.0 µm / Number grids imaged: 1 / Average electron dose: 25.0 e/Å2 Details: Drift corrected in post-processing. 4 images per hole. |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 100000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.6 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 59000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |