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- PDB-6qs4: Two-Step Activation Mechanism of the ClpB Disaggregase for Sequen... -
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Open data
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Basic information
Entry | Database: PDB / ID: 6qs4 | ||||||||||||
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Title | Two-Step Activation Mechanism of the ClpB Disaggregase for Sequential Substrate Threading by the Main ATPase Motor. | ||||||||||||
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Function / homology | ![]() response to heat / protein refolding / ![]() ![]() ![]() Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() ![]() ![]() ![]() ![]() | ||||||||||||
Method | ![]() ![]() ![]() | ||||||||||||
![]() | Deville, C. / Saibil, H.R. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Two-Step Activation Mechanism of the ClpB Disaggregase for Sequential Substrate Threading by the Main ATPase Motor. Authors: Célia Deville / Kamila Franke / Axel Mogk / Bernd Bukau / Helen R Saibil / ![]() ![]() Abstract: AAA+ proteins form asymmetric hexameric rings that hydrolyze ATP and thread substrate proteins through a central channel via mobile substrate-binding pore loops. Understanding how ATPase and ...AAA+ proteins form asymmetric hexameric rings that hydrolyze ATP and thread substrate proteins through a central channel via mobile substrate-binding pore loops. Understanding how ATPase and threading activities are regulated and intertwined is key to understanding the AAA+ protein mechanism. We studied the disaggregase ClpB, which contains tandem ATPase domains (AAA1, AAA2) and shifts between low and high ATPase and threading activities. Coiled-coil M-domains repress ClpB activity by encircling the AAA1 ring. Here, we determine the mechanism of ClpB activation by comparing ATPase mechanisms and cryo-EM structures of ClpB wild-type and a constitutively active ClpB M-domain mutant. We show that ClpB activation reduces ATPase cooperativity and induces a sequential mode of ATP hydrolysis in the AAA2 ring, the main ATPase motor. AAA1 and AAA2 rings do not work synchronously but in alternating cycles. This ensures high grip, enabling substrate threading via a processive, rope-climbing mechanism. | ||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 650.7 KB | Display | ![]() |
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PDB format | ![]() | 525 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 4621MC ![]() 4622C ![]() 4623C ![]() 4624C ![]() 4625C ![]() 4626C ![]() 4627C ![]() 4940C ![]() 4941C ![]() 4942C ![]() 6qs6C ![]() 6qs7C ![]() 6qs8C ![]() 6rn2C ![]() 6rn3C ![]() 6rn4C C: citing same article ( M: map data used to model this data |
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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: 95708.133 Da / Num. of mol.: 6 / Mutation: E279A/K476C/E678A Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() Strain: ATCC 9637 / CCM 2024 / DSM 1116 / NCIMB 8666 / NRRL B-766 / W Gene: clpB, ECW_m2821 / Production host: ![]() ![]() ![]() #2: Protein/peptide | | ![]() Mass: 1723.883 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() ![]() #3: Chemical | ChemComp-AGS / #4: Chemical | ![]() |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: ![]() |
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Sample preparation
Component | Name: ClpB-DWB-K476C bound to casein in presence of ATPgammaS Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT | ||||||||||||||||||||||||||||||
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Molecular weight | Value: 0.57 MDa / Experimental value: NO | ||||||||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() ![]() | ||||||||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() ![]() | ||||||||||||||||||||||||||||||
Buffer solution | pH: 7.5 | ||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 1.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied![]() ![]() | ||||||||||||||||||||||||||||||
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil, UltrAuFoil | ||||||||||||||||||||||||||||||
Vitrification![]() | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K |
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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![]() ![]() |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 1 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 6060 |
EM imaging optics | Energyfilter name![]() |
Image scans | Movie frames/image: 50 |
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Processing
Software | Name: PHENIX / Version: 1.12_2829: / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction![]() | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 875861 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry![]() | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction![]() | Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 23792 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: FLEXIBLE FIT / Space: REAL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 1CIU Accession code: 1CIU / Source name: PDB / Type: experimental model |