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- EMDB-20138: Cdc48 Symmetric Hexamer -

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Basic information

Entry
Database: EMDB / ID: EMD-20138
TitleCdc48 Symmetric Hexamer
Map data
SampleCdc48-Substrate Complex
Biological speciesSaccharomyces cerevisiae S288c (yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.5 Å
AuthorsCooney I / Han H / Hill CP / Shen PS
CitationJournal: Science / Year: 2019
Title: Structure of the Cdc48 segregase in the act of unfolding an authentic substrate.
Authors: Ian Cooney / Han Han / Michael G Stewart / Richard H Carson / Daniel T Hansen / Janet H Iwasa / John C Price / Christopher P Hill / Peter S Shen /
Abstract: The cellular machine Cdc48 functions in multiple biological pathways by segregating its protein substrates from a variety of stable environments such as organelles or multi-subunit complexes. Despite ...The cellular machine Cdc48 functions in multiple biological pathways by segregating its protein substrates from a variety of stable environments such as organelles or multi-subunit complexes. Despite extensive studies, the mechanism of Cdc48 has remained obscure, and its reported structures are inconsistent with models of substrate translocation proposed for other AAA+ ATPases. Here, we report a 3.7 Å resolution structure of Cdc48 in complex with an adaptor protein and a native substrate. Cdc48 engages substrate by adopting a helical configuration of substrate-binding residues that extends through the central pore of both of the ATPase rings. These findings indicate a unified hand-over-hand mechanism of protein translocation by Cdc48 and other AAA+ ATPases.
DateDeposition: Apr 22, 2019 / Header (metadata) release: May 8, 2019 / Map release: Jul 10, 2019 / Update: Jul 10, 2019

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0114
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.0114
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_20138.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.17 Å/pix.
x 256 pix.
= 299.008 Å
1.17 Å/pix.
x 256 pix.
= 299.008 Å
1.17 Å/pix.
x 256 pix.
= 299.008 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.168 Å
Density
Contour LevelBy AUTHOR: 0.0114 / Movie #1: 0.0114
Minimum - Maximum-0.0118964715 - 0.027188592
Average (Standard dev.)0.00035632626 (±0.0019502318)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 299.008 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.1681.1681.168
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z299.008299.008299.008
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.0120.0270.000

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Supplemental data

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Sample components

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Entire Cdc48-Substrate Complex

EntireName: Cdc48-Substrate Complex / Number of components: 1

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Component #1: protein, Cdc48-Substrate Complex

ProteinName: Cdc48-Substrate Complex / Recombinant expression: No
SourceSpecies: Saccharomyces cerevisiae S288c (yeast)

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Experimental details

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Sample preparation

SpecimenSpecimen state: Particle / Method: cryo EM
Sample solutionpH: 7.4
Support filmunspecified
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
ImagingMicroscope: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Electron dose: 48 e/Å2 / Illumination mode: FLOOD BEAM
LensImaging mode: BRIGHT FIELD
Specimen HolderModel: OTHER
CameraDetector: GATAN K2 SUMMIT (4k x 4k)

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Image processing

ProcessingMethod: single particle reconstruction / Number of projections: 26203
3D reconstructionResolution: 4.5 Å / Resolution method: FSC 0.143 CUT-OFF

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