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- PDB-8qxt: CryoEM structure of a GroEL14-GroES7 complex in presence of ADP-B... -

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Basic information

Entry
Database: PDB / ID: 8qxt
TitleCryoEM structure of a GroEL14-GroES7 complex in presence of ADP-BeFx with narrow GroEL7 trans ring conformation
Components
  • Chaperonin GroEL
  • Co-chaperonin GroES
KeywordsCHAPERONE / Chaperonin / Folding cage / proteostasis / heat shock / ATPase
Function / homology
Function and homology information


GroEL-GroES complex / chaperonin ATPase / virion assembly / : / 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 / : / protein folding chaperone / isomerase activity / ATP-dependent protein folding chaperone / response to radiation / unfolded protein binding / protein folding / protein-folding chaperone binding / response to heat / protein refolding / magnesium ion binding / ATP hydrolysis activity / ATP binding / metal ion binding / identical protein binding / membrane / cytosol
Similarity search - Function
Chaperonin GroES, conserved site / Chaperonins cpn10 signature. / Chaperonin 10 Kd subunit / GroES chaperonin family / GroES chaperonin superfamily / Chaperonin 10 Kd subunit / Chaperonin Cpn60, conserved site / Chaperonins cpn60 signature. / Chaperonin Cpn60/GroEL / GroEL-like equatorial domain superfamily ...Chaperonin GroES, conserved site / Chaperonins cpn10 signature. / Chaperonin 10 Kd subunit / GroES chaperonin family / GroES chaperonin superfamily / Chaperonin 10 Kd subunit / Chaperonin Cpn60, conserved site / Chaperonins cpn60 signature. / Chaperonin Cpn60/GroEL / GroEL-like equatorial domain superfamily / TCP-1-like chaperonin intermediate domain superfamily / GroEL-like apical domain superfamily / TCP-1/cpn60 chaperonin family / Chaperonin Cpn60/GroEL/TCP-1 family / GroES-like superfamily
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / BERYLLIUM TRIFLUORIDE ION / : / Chaperonin GroEL / Co-chaperonin GroES
Similarity search - Component
Biological speciesEscherichia coli BL21 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsWagner, J. / Caravajal, A.I. / Beck, F. / Bracher, A. / Wan, W. / Bohn, S. / Koerner, R. / Baumeister, W. / Fernandez-Busnadiego, R. / Hartl, F.U.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nature / Year: 2024
Title: Visualizing chaperonin function in situ by cryo-electron tomography.
Authors: Jonathan Wagner / Alonso I Carvajal / Andreas Bracher / Florian Beck / William Wan / Stefan Bohn / Roman Körner / Wolfgang Baumeister / Ruben Fernandez-Busnadiego / F Ulrich Hartl /
Abstract: Chaperonins are large barrel-shaped complexes that mediate ATP-dependent protein folding. The bacterial chaperonin GroEL forms juxtaposed rings that bind unfolded protein and the lid-shaped cofactor ...Chaperonins are large barrel-shaped complexes that mediate ATP-dependent protein folding. The bacterial chaperonin GroEL forms juxtaposed rings that bind unfolded protein and the lid-shaped cofactor GroES at their apertures. In vitro analyses of the chaperonin reaction have shown that substrate protein folds, unimpaired by aggregation, while transiently encapsulated in the GroEL central cavity by GroES. To determine the functional stoichiometry of GroEL, GroES and client protein in situ, here we visualized chaperonin complexes in their natural cellular environment using cryo-electron tomography. We find that, under various growth conditions, around 55-70% of GroEL binds GroES asymmetrically on one ring, with the remainder populating symmetrical complexes. Bound substrate protein is detected on the free ring of the asymmetrical complex, defining the substrate acceptor state. In situ analysis of GroEL-GroES chambers, validated by high-resolution structures obtained in vitro, showed the presence of encapsulated substrate protein in a folded state before release into the cytosol. Based on a comprehensive quantification and conformational analysis of chaperonin complexes, we propose a GroEL-GroES reaction cycle that consists of linked asymmetrical and symmetrical subreactions mediating protein folding. Our findings illuminate the native conformational and functional chaperonin cycle directly within cells.
History
DepositionOct 25, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jul 3, 2024Provider: repository / Type: Initial release
Revision 1.1Aug 21, 2024Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.pdbx_database_id_DOI / _em_admin.last_update
Revision 1.2Sep 4, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name / _em_admin.last_update
Revision 1.3Sep 25, 2024Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Chaperonin GroEL
B: Chaperonin GroEL
C: Chaperonin GroEL
D: Chaperonin GroEL
E: Chaperonin GroEL
F: Chaperonin GroEL
G: Chaperonin GroEL
H: Chaperonin GroEL
I: Chaperonin GroEL
J: Chaperonin GroEL
K: Chaperonin GroEL
L: Chaperonin GroEL
M: Chaperonin GroEL
N: Chaperonin GroEL
O: Co-chaperonin GroES
P: Co-chaperonin GroES
Q: Co-chaperonin GroES
R: Co-chaperonin GroES
S: Co-chaperonin GroES
T: Co-chaperonin GroES
U: Co-chaperonin GroES
hetero molecules


Theoretical massNumber of molelcules
Total (without water)881,78470
Polymers874,45421
Non-polymers7,33149
Water1,13563
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Protein , 2 types, 21 molecules ABCDEFGHIJKLMNOPQRSTU

#1: Protein
Chaperonin GroEL / 60 kDa chaperonin / Chaperonin-60 / Cpn60 / GroEL protein


Mass: 57260.504 Da / Num. of mol.: 14
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli BL21(DE3) (bacteria) / Gene: groEL, groL, mopA, b4143, JW4103 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A6F5, chaperonin ATPase
#2: Protein
Co-chaperonin GroES / 10 kDa chaperonin / Chaperonin-10 / Cpn10


Mass: 10400.938 Da / Num. of mol.: 7
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli BL21(DE3) (bacteria) / Gene: groES, groS, mopB, b4142, JW4102 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A6F9

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Non-polymers , 5 types, 112 molecules

#3: Chemical
ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Comment: ADP, energy-carrying molecule*YM
#4: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: Mg
#5: Chemical
ChemComp-BEF / BERYLLIUM TRIFLUORIDE ION


Mass: 66.007 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: BeF3
#6: Chemical
ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: K
#7: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 63 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: GroEL14-GroES7-MetK / Type: COMPLEX / Details: with bound ADP-BeF3 Mg2+ K+ / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 1.03 MDa / Experimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.4
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMMOPSC7H15NO4S1
2200 mMPotassium chlorideKCl1
310 mMMagnesium chlorideMgCl21
45 mMDithiothreitolC4H10O2S21
530 mMSodium fluorideNaF1
65 mMBeryllium sulfateBeSO41
71 mMAdenosine triphosphateC10H16N5O13P31
SpecimenConc.: 10.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277 K
Details: 5.9 mM n-octyl-beta-D-glucopyranoside were added before vitrification

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal magnification: 22500 X / Nominal defocus max: 3000 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 55 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
2SerialEMimage acquisition
4CTFFINDCTF correction
7UCSF Chimera1.13.1model fitting
8Coot0.9.4model fitting
10PHENIX1.19.2model refinement
11cryoSPARC3.1initial Euler assignment
12cryoSPARC3.1final Euler assignment
13cryoSPARC3.1classification
14cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C7 (7 fold cyclic)
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 169454 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
11SX3

1sx3

11SX31PDBexperimental model
25OPX

5opx

15OPX2PDBexperimental model
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 55.9 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.004759654
ELECTRON MICROSCOPYf_angle_d0.616480605
ELECTRON MICROSCOPYf_chiral_restr0.04559828
ELECTRON MICROSCOPYf_plane_restr0.003610465
ELECTRON MICROSCOPYf_dihedral_angle_d6.41958582

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