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- PDB-7r9m: Methanococcus maripaludis chaperonin, closed conformation 2 -

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Open data


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Basic information

Entry
Database: PDB / ID: 7r9m
TitleMethanococcus maripaludis chaperonin, closed conformation 2
ComponentsChaperonin
KeywordsCHAPERONE / Open conformation
Function / homology
Function and homology information


ATP-dependent protein folding chaperone / unfolded protein binding / ATP hydrolysis activity / ATP binding / identical protein binding
Similarity search - Function
Thermosome, archaeal / Chaperonins TCP-1 signature 1. / Chaperonins TCP-1 signature 2. / Chaperonin TCP-1, conserved site / Chaperonins TCP-1 signature 3. / Chaperone tailless complex polypeptide 1 (TCP-1) / 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
Similarity search - Domain/homology
Biological speciesMethanococcus maripaludis (archaea)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4 Å
AuthorsZhao, Y. / Schmid, M. / Frydman, J. / Chiu, W.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)P01NS092525 United States
National Institutes of Health/Office of the DirectorS10OD021600 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM07407411 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)P41GM103832 United States
CitationJournal: Nat Commun / Year: 2021
Title: CryoEM reveals the stochastic nature of individual ATP binding events in a group II chaperonin.
Authors: Yanyan Zhao / Michael F Schmid / Judith Frydman / Wah Chiu /
Abstract: Chaperonins are homo- or hetero-oligomeric complexes that use ATP binding and hydrolysis to facilitate protein folding. ATP hydrolysis exhibits both positive and negative cooperativity. The mechanism ...Chaperonins are homo- or hetero-oligomeric complexes that use ATP binding and hydrolysis to facilitate protein folding. ATP hydrolysis exhibits both positive and negative cooperativity. The mechanism by which chaperonins coordinate ATP utilization in their multiple subunits remains unclear. Here we use cryoEM to study ATP binding in the homo-oligomeric archaeal chaperonin from Methanococcus maripaludis (MmCpn), consisting of two stacked rings composed of eight identical subunits each. Using a series of image classification steps, we obtained different structural snapshots of individual chaperonins undergoing the nucleotide binding process. We identified nucleotide-bound and free states of individual subunits in each chaperonin, allowing us to determine the ATP occupancy state of each MmCpn particle. We observe distinctive tertiary and quaternary structures reflecting variations in nucleotide occupancy and subunit conformations in each chaperonin complex. Detailed analysis of the nucleotide distribution in each MmCpn complex indicates that individual ATP binding events occur in a statistically random manner for MmCpn, both within and across the rings. Our findings illustrate the power of cryoEM to characterize a biochemical property of multi-subunit ligand binding cooperativity at the individual particle level.
History
DepositionJun 29, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 11, 2021Provider: repository / Type: Initial release
Revision 1.1Aug 25, 2021Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name

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Structure visualization

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Assembly

Deposited unit
J: Chaperonin


Theoretical massNumber of molelcules
Total (without water)54,3731
Polymers54,3731
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area0 Å2
ΔGint0 kcal/mol
Surface area28790 Å2

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Components

#1: Protein Chaperonin / / MmCpn


Mass: 54372.539 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Methanococcus maripaludis (archaea) / Production host: Escherichia coli (E. coli) / References: UniProt: Q877G8

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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: MmCpn / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 1 MDa
Source (natural)Organism: Methanococcus maripaludis (archaea)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 50 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 233000 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT

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