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- PDB-7pxa: Open-gate mycobacterium 20S CP proteasome in complex MPA - global... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7pxa | ||||||
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Title | Open-gate mycobacterium 20S CP proteasome in complex MPA - global 3D refinement | ||||||
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![]() | CYTOSOLIC PROTEIN / AAA motor / ATPAse / mycobacterium / proteasome activator / 20S CP | ||||||
Function / homology | ![]() retrograde protein transport, ER to cytosol / polyubiquitin modification-dependent protein binding / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / proteasome core complex, alpha-subunit complex / threonine-type endopeptidase activity / proteasomal protein catabolic process / proteasome complex / modification-dependent protein catabolic process / ATP hydrolysis activity ...retrograde protein transport, ER to cytosol / polyubiquitin modification-dependent protein binding / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / proteasome core complex, alpha-subunit complex / threonine-type endopeptidase activity / proteasomal protein catabolic process / proteasome complex / modification-dependent protein catabolic process / ATP hydrolysis activity / ATP binding / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å | ||||||
![]() | Jomaa, A. / Kavalchuk, M. / Weber-Ban, E. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis of prokaryotic ubiquitin-like protein engagement and translocation by the mycobacterial Mpa-proteasome complex. Authors: Mikhail Kavalchuk / Ahmad Jomaa / Andreas U Müller / Eilika Weber-Ban / ![]() Abstract: Proteasomes are present in eukaryotes, archaea and Actinobacteria, including the human pathogen Mycobacterium tuberculosis, where proteasomal degradation supports persistence inside the host. In ...Proteasomes are present in eukaryotes, archaea and Actinobacteria, including the human pathogen Mycobacterium tuberculosis, where proteasomal degradation supports persistence inside the host. In mycobacteria and other members of Actinobacteria, prokaryotic ubiquitin-like protein (Pup) serves as a degradation tag post-translationally conjugated to target proteins for their recruitment to the mycobacterial proteasome ATPase (Mpa). Here, we use single-particle cryo-electron microscopy to determine the structure of Mpa in complex with the 20S core particle at an early stage of pupylated substrate recruitment, shedding light on the mechanism of substrate translocation. Two conformational states of Mpa show how substrate is translocated stepwise towards the degradation chamber of the proteasome core particle. We also demonstrate, in vitro and in vivo, the importance of a structural feature in Mpa that allows formation of alternating charge-complementary interactions with the proteasome resulting in radial, rail-guided movements during the ATPase conformational cycle. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1 MB | Display | ![]() |
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PDB format | ![]() | 852.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 13695MC ![]() 7px9C ![]() 7pxbC ![]() 7pxcC ![]() 7pxdC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 26911.039 Da / Num. of mol.: 14 Source method: isolated from a genetically manipulated source Details: first 7 residues were removed (open-gate mutant) / Source: (gene. exp.) ![]() ![]() Gene: prcA_1, prcA, prcA_2, C0094_11490, ERS007657_01774, ERS007661_00268, ERS007663_02522, ERS007665_00481, ERS007720_00613, ERS007722_01881 Production host: ![]() ![]() #2: Protein | Mass: 67487.930 Da / Num. of mol.: 7 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: arc, mpa, C0094_11520, DSI38_15585, E5M05_19030, E5M52_17490, E5M78_17520, ERS007661_01151, ERS007665_00732, ERS007679_01634, ERS007681_02311, ERS007703_01049, ERS007720_01453, ERS007722_00998, ...Gene: arc, mpa, C0094_11520, DSI38_15585, E5M05_19030, E5M52_17490, E5M78_17520, ERS007661_01151, ERS007665_00732, ERS007679_01634, ERS007681_02311, ERS007703_01049, ERS007720_01453, ERS007722_00998, ERS007741_01455, ERS023446_02559, ERS024276_00114, ERS027646_02035, ERS027659_02128, ERS027661_00811, ERS094182_01863, F6W99_00704, FRD82_11355, GCL30_10870, SAMEA2683035_00457 Production host: ![]() ![]() #3: Protein | Mass: 30332.006 Da / Num. of mol.: 14 Source method: isolated from a genetically manipulated source Details: propeptide (first N-terminal 57 residues) was removed Source: (gene. exp.) ![]() ![]() Gene: prcB, C0094_11495, DSI38_15610, E5M05_20980, E5M52_20895, E5M78_20920, ERS007665_00482, ERS007670_00434, ERS007679_01035, ERS007720_00612, ERS007722_01880, ERS007741_02624, ERS013471_03478, ...Gene: prcB, C0094_11495, DSI38_15610, E5M05_20980, E5M52_20895, E5M78_20920, ERS007665_00482, ERS007670_00434, ERS007679_01035, ERS007720_00612, ERS007722_01880, ERS007741_02624, ERS013471_03478, ERS023446_02554, ERS024276_00650, ERS094182_01868, F6W99_00699, GCL30_10845, SAMEA2683035_00452 Production host: ![]() ![]() References: UniProt: A0A045HFG5, proteasome endopeptidase complex |
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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: Mycobacterial Proteasome-associated ATPase in complex with substrate and open-gate 20SCP Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Value: 1.1 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1500 nm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 860718 | ||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 222719 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT / Space: REAL | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 5KWA Accession code: 5KWA / Source name: PDB / Type: experimental model |