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- EMDB-9027: Mtb ClpB in complex with ATPgammaS and casein, Combined -

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Basic information

Entry
Database: EMDB / ID: EMD-9027
TitleMtb ClpB in complex with ATPgammaS and casein, Combined
Map dataMtb ClpB in complex with ATPgammaS and casein, Combined
Sample
  • Complex: Mtb ClpB in complex with ATPgammaS and casein
Function / homology
Function and homology information


peptidoglycan-based cell wall / cellular response to heat / response to heat / protein refolding / ATP hydrolysis activity / ATP binding / plasma membrane / 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
Chaperone protein ClpB / Chaperone protein ClpB
Similarity search - Component
Biological speciesMycobacterium tuberculosis (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsYu HJ / Li HL
CitationJournal: Proc Natl Acad Sci U S A / Year: 2018
Title: ATP hydrolysis-coupled peptide translocation mechanism of ClpB.
Authors: Hongjun Yu / Tania J Lupoli / Amanda Kovach / Xing Meng / Gongpu Zhao / Carl F Nathan / Huilin Li /
Abstract: The protein disaggregase ClpB hexamer is conserved across evolution and has two AAA+-type nucleotide-binding domains, NBD1 and NBD2, in each protomer. In (), ClpB facilitates asymmetric distribution ...The protein disaggregase ClpB hexamer is conserved across evolution and has two AAA+-type nucleotide-binding domains, NBD1 and NBD2, in each protomer. In (), ClpB facilitates asymmetric distribution of protein aggregates during cell division to help the pathogen survive and persist within the host, but a mechanistic understanding has been lacking. Here we report cryo-EM structures at 3.8- to 3.9-Å resolution of ClpB bound to a model substrate, casein, in the presence of the weakly hydrolyzable ATP mimic adenosine 5'-[γ-thio]triphosphate. ClpB existed in solution in two closed-ring conformations, conformers 1 and 2. In both conformers, the 12 pore-loops on the 12 NTDs of the six protomers (P1-P6) were arranged similarly to a staircase around the bound peptide. Conformer 1 is a low-affinity state in which three of the 12 pore-loops (the protomer P1 NBD1 and NBD2 loops and the protomer P2 NBD1 loop) are not engaged with peptide. Conformer 2 is a high-affinity state because only one pore-loop (the protomer P2 NBD1 loop) is not engaged with the peptide. The resolution of the two conformations, along with their bound substrate peptides and nucleotides, enabled us to propose a nucleotide-driven peptide translocation mechanism of a bacterial ClpB that is largely consistent with several recent unfoldase structures, in particular with the eukaryotic Hsp104. However, whereas Hsp104's two NBDs move in opposing directions during one step of peptide translocation, in Mtb ClpB the two NBDs move only in the direction of translocation.
History
DepositionAug 6, 2018-
Header (metadata) releaseSep 26, 2018-
Map releaseSep 26, 2018-
UpdateDec 5, 2018-
Current statusDec 5, 2018Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.033
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.033
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_9027.png

Downloads & links

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Map

FileDownload / File: emd_9027.map.gz / Format: CCP4 / Size: 95 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMtb ClpB in complex with ATPgammaS and casein, Combined
Voxel sizeX=Y=Z: 1.074 Å
Density
Contour LevelBy AUTHOR: 0.033 / Movie #1: 0.033
Minimum - Maximum-0.101976514 - 0.23897436
Average (Standard dev.)0.0003182499 (±0.006656888)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions292292292
Spacing292292292
CellA=B=C: 313.608 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0741.0741.074
M x/y/z292292292
origin x/y/z0.0000.0000.000
length x/y/z313.608313.608313.608
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ450450450
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS292292292
D min/max/mean-0.1020.2390.000

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Supplemental data

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Sample components

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Entire : Mtb ClpB in complex with ATPgammaS and casein

EntireName: Mtb ClpB in complex with ATPgammaS and casein
Components
  • Complex: Mtb ClpB in complex with ATPgammaS and casein

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Supramolecule #1: Mtb ClpB in complex with ATPgammaS and casein

SupramoleculeName: Mtb ClpB in complex with ATPgammaS and casein / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7
Source (natural)Organism: Mycobacterium tuberculosis (bacteria)
Recombinant expressionOrganism: Escherichia coli (E. coli)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 1.7 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: CTFFIND (ver. 4)
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.0) / Number images used: 184777
FSC plot (resolution estimation)

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