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- PDB-6w6i: The Mycobacterium tuberculosis ClpB disaggregase hexamer structur... -

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Basic information

Entry
Database: PDB / ID: 6w6i
TitleThe Mycobacterium tuberculosis ClpB disaggregase hexamer structure in conformation T in the presence of DnaK chaperone and a model substrate
Components
  • Chaperone protein ClpB
  • Substrate
KeywordsCHAPERONE / ClpB-DnaK complex / protein aggregates / Refold / Unfold
Function / homology
Function and homology information


response to heat / protein refolding / ATP hydrolysis activity / ATP binding / cytoplasm
Similarity search - Function
Chaperonin ClpB / ClpA/B, conserved site 2 / Chaperonins clpA/B signature 2. / ClpA/B, conserved site 1 / Chaperonins clpA/B signature 1. / ClpA/ClpB, AAA lid domain / AAA lid domain / Clp amino terminal domain, pathogenicity island component / Clp repeat (R) domain profile. / Clp, repeat (R) domain ...Chaperonin ClpB / ClpA/B, conserved site 2 / Chaperonins clpA/B signature 2. / ClpA/B, conserved site 1 / Chaperonins clpA/B signature 1. / ClpA/ClpB, AAA lid domain / AAA lid domain / Clp amino terminal domain, pathogenicity island component / Clp repeat (R) domain profile. / Clp, repeat (R) domain / Clp, N-terminal domain superfamily / ClpA/B family / Clp ATPase, C-terminal / AAA domain (Cdc48 subfamily) / C-terminal, D2-small domain, of ClpB protein / C-terminal, D2-small domain, of ClpB protein / ATPase family associated with various cellular activities (AAA) / ATPase, AAA-type, core / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / Chaperone protein ClpB
Similarity search - Component
Biological speciesMycobacterium tuberculosis (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / Resolution: 3.5 Å
AuthorsYin, Y. / Li, H.
Funding support1items
OrganizationGrant numberCountry
National Institutes of Health/National Center for Complementary and Integrative Health (NIH/NCCIH)
CitationJournal: Cell Rep / Year: 2021
Title: Structural basis for aggregate dissolution and refolding by the Mycobacterium tuberculosis ClpB-DnaK bi-chaperone system.
Authors: Yanting Yin / Xiang Feng / Hongjun Yu / Allison Fay / Amanda Kovach / Michael S Glickman / Huilin Li /
Abstract: The M. tuberculosis (Mtb) ClpB is a protein disaggregase that helps to rejuvenate the bacterial cell. DnaK is a protein foldase that can function alone, but it can also bind to the ClpB hexamer to ...The M. tuberculosis (Mtb) ClpB is a protein disaggregase that helps to rejuvenate the bacterial cell. DnaK is a protein foldase that can function alone, but it can also bind to the ClpB hexamer to physically couple protein disaggregation with protein refolding, although the molecular mechanism is not well understood. Here, we report the cryo-EM analysis of the Mtb ClpB-DnaK bi-chaperone in the presence of ATPγS and a protein substrate. We observe three ClpB conformations in the presence of DnaK, identify a conserved TGIP loop linking the oligonucleotide/oligosaccharide-binding domain and the nucleotide-binding domain that is important for ClpB function, derive the interface between the regulatory middle domain of the ClpB and the DnaK nucleotide-binding domain, and find that DnaK binding stabilizes, but does not bend or tilt, the ClpB middle domain. We propose a model for the synergistic actions of aggregate dissolution and refolding by the Mtb ClpB-DnaK bi-chaperone system.
History
DepositionMar 17, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 26, 2021Provider: repository / Type: Initial release
Revision 1.1Dec 8, 2021Group: Database references / Category: citation / citation_author / database_2
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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  • Deposited structure unit
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Assembly

Deposited unit
A: Chaperone protein ClpB
B: Chaperone protein ClpB
C: Chaperone protein ClpB
D: Chaperone protein ClpB
E: Chaperone protein ClpB
F: Chaperone protein ClpB
N: Substrate
hetero molecules


Theoretical massNumber of molelcules
Total (without water)564,70319
Polymers558,6167
Non-polymers6,08712
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: isothermal titration calorimetry
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area53340 Å2
ΔGint-104 kcal/mol
Surface area153970 Å2

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Components

#1: Protein
Chaperone protein ClpB /


Mass: 92688.281 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mycobacterium tuberculosis (bacteria) / Gene: clpB, MT0397 / Production host: Escherichia coli (E. coli) / References: UniProt: P9WPD0
#2: Protein/peptide Substrate


Mass: 2486.056 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mycobacterium tuberculosis (bacteria) / Production host: Escherichia coli (E. coli)
#3: Chemical
ChemComp-AGS / PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / ATP-GAMMA-S / ADENOSINE 5'-(3-THIOTRIPHOSPHATE) / ADENOSINE 5'-(GAMMA-THIOTRIPHOSPHATE) / ADENOSINE-5'-DIPHOSPHATE MONOTHIOPHOSPHATE


Mass: 523.247 Da / Num. of mol.: 10 / Source method: obtained synthetically / Formula: C10H16N5O12P3S / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP-gamma-S, energy-carrying molecule analogue*YM
#4: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE / Adenosine diphosphate


Mass: 427.201 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM
Has ligand of interestY

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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: ClpB/DnaK complex / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Mycobacterium tuberculosis (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: NO
Specimen supportDetails: unspecified

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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: DIFFRACTION
Image recordingElectron dose: 2 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 66569 / Symmetry type: POINT

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