+Open data
-Basic information
Entry | Database: PDB / ID: 8ba9 | ||||||
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Title | CryoEM structure of GroEL-GroES-ADP.AlF3-Rubisco. | ||||||
Components |
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Keywords | CHAPERONE / GroEL / GroES | ||||||
Function / homology | Function and homology information GroEL-GroES complex / chaperonin ATPase / virion assembly / chaperone cofactor-dependent protein refolding / protein folding chaperone / isomerase activity / ATP-dependent protein folding chaperone / response to radiation / unfolded protein binding / protein folding ...GroEL-GroES complex / chaperonin ATPase / virion assembly / chaperone cofactor-dependent protein refolding / protein folding chaperone / isomerase activity / ATP-dependent protein folding chaperone / response to radiation / unfolded protein binding / protein folding / protein-folding chaperone binding / protein refolding / response to heat / magnesium ion binding / ATP hydrolysis activity / ATP binding / identical protein binding / membrane / metal ion binding / cytosol Similarity search - Function | ||||||
Biological species | Escherichia coli K-12 (bacteria) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å | ||||||
Authors | Gardner, S. / Saibil, H.R. | ||||||
Funding support | United Kingdom, 1items
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Citation | Journal: Proc Natl Acad Sci U S A / Year: 2023 Title: Structural basis of substrate progression through the bacterial chaperonin cycle. Authors: Scott Gardner / Michele C Darrow / Natalya Lukoyanova / Konstantinos Thalassinos / Helen R Saibil / Abstract: The bacterial chaperonin GroEL-GroES promotes protein folding through ATP-regulated cycles of substrate protein binding, encapsulation, and release. Here, we have used cryoEM to determine structures ...The bacterial chaperonin GroEL-GroES promotes protein folding through ATP-regulated cycles of substrate protein binding, encapsulation, and release. Here, we have used cryoEM to determine structures of GroEL, GroEL-ADP·BeF, and GroEL-ADP·AlF-GroES all complexed with the model substrate Rubisco. Our structures provide a series of snapshots that show how the conformation and interactions of non-native Rubisco change as it proceeds through the GroEL-GroES reaction cycle. We observe specific charged and hydrophobic GroEL residues forming strong initial contacts with non-native Rubisco. Binding of ATP or ADP·BeF to GroEL-Rubisco results in the formation of an intermediate GroEL complex displaying striking asymmetry in the ATP/ADP·BeF-bound ring. In this ring, four GroEL subunits bind Rubisco and the other three are in the GroES-accepting conformation, suggesting how GroEL can recruit GroES without releasing bound substrate. Our cryoEM structures of stalled GroEL-ADP·AlF-Rubisco-GroES complexes show Rubisco folding intermediates interacting with GroEL-GroES via different sets of residues. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8ba9.cif.gz | 2.4 MB | Display | PDBx/mmCIF format |
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PDB format | pdb8ba9.ent.gz | Display | PDB format | |
PDBx/mmJSON format | 8ba9.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 8ba9_validation.pdf.gz | 2.3 MB | Display | wwPDB validaton report |
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Full document | 8ba9_full_validation.pdf.gz | 2.4 MB | Display | |
Data in XML | 8ba9_validation.xml.gz | 207.1 KB | Display | |
Data in CIF | 8ba9_validation.cif.gz | 314.7 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/ba/8ba9 ftp://data.pdbj.org/pub/pdb/validation_reports/ba/8ba9 | HTTPS FTP |
-Related structure data
Related structure data | 15942MC 8ba7C 8ba8C M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
-Protein , 2 types, 21 molecules ABCDEFGHIJKLMNOPQRSTU
#1: Protein | Mass: 55220.105 Da / Num. of mol.: 14 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Escherichia coli K-12 (bacteria) / Gene: groL, groEL, mopA, b4143, JW4103 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A6F5 #2: Protein | Mass: 10400.938 Da / Num. of mol.: 7 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Escherichia coli K-12 (bacteria) / Gene: groES, groS, mopB, b4142, JW4102 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A6F9 |
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-Non-polymers , 4 types, 42 molecules
#3: Chemical | ChemComp-AF3 / #4: Chemical | ChemComp-ADP / #5: Chemical | ChemComp-MG / #6: Chemical | ChemComp-K / |
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-Details
Has ligand of interest | 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 |
-Sample preparation
Component | Name: GroEL-ADP.BeFx-Rubisco / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.802 MDa / Experimental value: NO |
Source (natural) | Organism: Escherichia coli (E. coli) |
Source (recombinant) | Organism: Escherichia coli BL21(DE3) (bacteria) / Plasmid: pTrcESL |
Buffer solution | pH: 7.5 |
Specimen | Conc.: 2.7 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Instrument: SPOTITON / Cryogen name: ETHANE / Humidity: 80 % / Chamber temperature: 293 K Details: The grid was prepared using a chameleon (SPT Labtech). |
-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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 1400 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm |
Image recording | Electron dose: 40.2 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 2 |
-Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||
Particle selection | Num. of particles selected: 7712622 | ||||||||||||||||||||
3D reconstruction | Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 30965 / Num. of class averages: 1 / Symmetry type: POINT |