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- EMDB-5137: Wildtype Mm-cpn in the closed state -

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Basic information

Entry
Database: EMDB / ID: EMD-5137
TitleWildtype Mm-cpn in the closed state
Map dataThis is a map for the wildtype Mm-cpn in the nucleotide-induced closed state.
Sample
  • Sample: Mm-cpn with 1mM ATP/AlFx
  • Protein or peptide: Methanococcus maripaludis chaperonin
KeywordsGroup II chaperonin / Protein Folding / Mm-cpn / Single Particle Reconstruction / Methanococcus maripaludis / Chaperone
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)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsZhang J / Baker ML / Schroeder G / Douglas NR / Reissmann S / Jakana J / Dougherty M / Fu CJ / Levitt M / Ludtke SJ ...Zhang J / Baker ML / Schroeder G / Douglas NR / Reissmann S / Jakana J / Dougherty M / Fu CJ / Levitt M / Ludtke SJ / Frydman J / Chiu W
CitationJournal: Nature / Year: 2010
Title: Mechanism of folding chamber closure in a group II chaperonin.
Authors: Junjie Zhang / Matthew L Baker / Gunnar F Schröder / Nicholai R Douglas / Stefanie Reissmann / Joanita Jakana / Matthew Dougherty / Caroline J Fu / Michael Levitt / Steven J Ludtke / Judith ...Authors: Junjie Zhang / Matthew L Baker / Gunnar F Schröder / Nicholai R Douglas / Stefanie Reissmann / Joanita Jakana / Matthew Dougherty / Caroline J Fu / Michael Levitt / Steven J Ludtke / Judith Frydman / Wah Chiu /
Abstract: Group II chaperonins are essential mediators of cellular protein folding in eukaryotes and archaea. These oligomeric protein machines, approximately 1 megadalton, consist of two back-to-back rings ...Group II chaperonins are essential mediators of cellular protein folding in eukaryotes and archaea. These oligomeric protein machines, approximately 1 megadalton, consist of two back-to-back rings encompassing a central cavity that accommodates polypeptide substrates. Chaperonin-mediated protein folding is critically dependent on the closure of a built-in lid, which is triggered by ATP hydrolysis. The structural rearrangements and molecular events leading to lid closure are still unknown. Here we report four single particle cryo-electron microscopy (cryo-EM) structures of Mm-cpn, an archaeal group II chaperonin, in the nucleotide-free (open) and nucleotide-induced (closed) states. The 4.3 A resolution of the closed conformation allowed building of the first ever atomic model directly from the single particle cryo-EM density map, in which we were able to visualize the nucleotide and more than 70% of the side chains. The model of the open conformation was obtained by using the deformable elastic network modelling with the 8 A resolution open-state cryo-EM density restraints. Together, the open and closed structures show how local conformational changes triggered by ATP hydrolysis lead to an alteration of intersubunit contacts within and across the rings, ultimately causing a rocking motion that closes the ring. Our analyses show that there is an intricate and unforeseen set of interactions controlling allosteric communication and inter-ring signalling, driving the conformational cycle of group II chaperonins. Beyond this, we anticipate that our methodology of combining single particle cryo-EM and computational modelling will become a powerful tool in the determination of atomic details involved in the dynamic processes of macromolecular machines in solution.
History
DepositionOct 22, 2009-
Header (metadata) releaseFeb 4, 2010-
Map releaseFeb 4, 2010-
UpdateJul 8, 2011-
Current statusJul 8, 2011Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.38
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.38
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-3los
  • Surface level: 0.38
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_5137_1.png

Downloads & links

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Map

FileDownload / File: emd_5137.map.gz / Format: CCP4 / Size: 26.4 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationThis is a map for the wildtype Mm-cpn in the nucleotide-induced closed state.
Voxel sizeX=Y=Z: 1.33 Å
Density
Contour LevelBy AUTHOR: 0.38 / Movie #1: 0.38
Minimum - Maximum-0.87869 - 1.44545
Average (Standard dev.)0.0144782 (±0.0983026)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-96-96-96
Dimensions192192192
Spacing192192192
CellA=B=C: 255.36 Å
α=β=γ: 90 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.331.331.33
M x/y/z192192192
origin x/y/z0.0000.0000.000
length x/y/z255.360255.360255.360
α/β/γ90.00090.00090.000
start NX/NY/NZ-34-26-72
NX/NY/NZ6953145
MAP C/R/S123
start NC/NR/NS-96-96-96
NC/NR/NS192192192
D min/max/mean-0.8791.4450.014

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Supplemental data

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Sample components

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Entire : Mm-cpn with 1mM ATP/AlFx

EntireName: Mm-cpn with 1mM ATP/AlFx
Components
  • Sample: Mm-cpn with 1mM ATP/AlFx
  • Protein or peptide: Methanococcus maripaludis chaperonin

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Supramolecule #1000: Mm-cpn with 1mM ATP/AlFx

SupramoleculeName: Mm-cpn with 1mM ATP/AlFx / type: sample / ID: 1000 / Oligomeric state: 16-mer / Number unique components: 1
Molecular weightExperimental: 960 KDa / Theoretical: 960 KDa

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Macromolecule #1: Methanococcus maripaludis chaperonin

MacromoleculeName: Methanococcus maripaludis chaperonin / type: protein_or_peptide / ID: 1 / Name.synonym: Mm-cpn / Number of copies: 16 / Oligomeric state: 16-mer / Recombinant expression: Yes
Source (natural)Organism: Methanococcus maripaludis (archaea)
Molecular weightExperimental: 960 KDa / Theoretical: 960 KDa
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

VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Instrument: OTHER / Details: Vitrification instrument: Vitrobot / Method: 1 blot 3 seconds

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Electron microscopy

MicroscopeJEOL 3200FSC
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 112000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 4.1 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 80000
Specialist opticsEnergy filter - Name: in column omega filter / Energy filter - Lower energy threshold: 0.0 eV / Energy filter - Upper energy threshold: 10.0 eV
Sample stageSpecimen holder: side-entry / Specimen holder model: JEOL 3200FSC CRYOHOLDER
TemperatureAverage: 100 K
Alignment procedureLegacy - Astigmatism: objective lens astigmatism was corrected at 100,000 times magnification
Image recordingCategory: CCD / Film or detector model: GENERIC GATAN (4k x 4k) / Average electron dose: 20 e/Å2

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Image processing

CTF correctionDetails: Each micrograph
Final reconstructionAlgorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 4.3 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: EMAN

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