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- EMDB-9507: Cryo-EM map of the RP region of human 26S proteasome at 4.3A -

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Basic information

Entry
Database: EMDB / ID: EMD-9507
TitleCryo-EM map of the RP region of human 26S proteasome at 4.3A
Map datamap of the RP region
Sample
  • Complex: human 26S proteasomeProteasome
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsHuang XL / Luan B / Wu JP / Shi YG
CitationJournal: Nat Struct Mol Biol / Year: 2016
Title: An atomic structure of the human 26S proteasome.
Authors: Xiuliang Huang / Bai Luan / Jianping Wu / Yigong Shi /
Abstract: We report the cryo-EM structure of the human 26S proteasome at an average resolution of 3.5 Å, allowing atomic modeling of 28 subunits in the core particle (CP) and 18 subunits in the regulatory ...We report the cryo-EM structure of the human 26S proteasome at an average resolution of 3.5 Å, allowing atomic modeling of 28 subunits in the core particle (CP) and 18 subunits in the regulatory particle (RP). The C-terminal residues of Rpt3 and Rpt5 subunits in the RP can be seen inserted into surface pockets formed between adjacent α subunits in the CP. Each of the six Rpt subunits contains a bound nucleotide, and the central gate of the CP α-ring is closed despite RP association. The six pore 1 loops in the Rpt ring are arranged similarly to a spiral staircase along the axial channel of substrate transport, which is constricted by the pore 2 loops. We also determined the cryo-EM structure of the human proteasome bound to the deubiquitinating enzyme USP14 at 4.35-Å resolution. Together, our structures provide a framework for mechanistic understanding of eukaryotic proteasome function.
History
DepositionJul 1, 2016-
Header (metadata) releaseJul 27, 2016-
Map releaseJul 27, 2016-
UpdateDec 13, 2017-
Current statusDec 13, 2017Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.044
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.044
  • Imaged by UCSF Chimera
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Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_9507.png

Downloads & links

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Map

FileDownload / File: emd_9507.map.gz / Format: CCP4 / Size: 83.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationmap of the RP region
Voxel sizeX=Y=Z: 1.07 Å
Density
Contour LevelBy AUTHOR: 0.044 / Movie #1: 0.044
Minimum - Maximum-0.10434665 - 0.18658453
Average (Standard dev.)0.0006841772 (±0.009833503)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions280280280
Spacing280280280
CellA=B=C: 299.6 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.071.071.07
M x/y/z280280280
origin x/y/z0.0000.0000.000
length x/y/z299.600299.600299.600
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS280280280
D min/max/mean-0.1040.1870.001

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Supplemental data

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Sample components

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Entire : human 26S proteasome

EntireName: human 26S proteasomeProteasome
Components
  • Complex: human 26S proteasomeProteasome

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Supramolecule #1: human 26S proteasome

SupramoleculeName: human 26S proteasome / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 2.5 MDa

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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

Concentration1 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
25.0 mMTris-HClTrisTris-HClTris
150.0 mMNaClSodium chloridesodium chloride
5.0 mMDTTDTT
GridMaterial: COPPER / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 3.0 nm / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 281 K / Instrument: FEI VITROBOT MARK IV / Details: blot for 2s before plunging.
DetailsThis sample was monodisperse

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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 / Nominal magnification: 75000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
TemperatureMin: 70.0 K
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Number real images: 4881 / Average exposure time: 1.6 sec. / Average electron dose: 37.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 331338
CTF correctionSoftware - Name: CTFFIND (ver. 3)
Initial angle assignmentType: COMMON LINE / Software - Name: RELION (ver. 1.4)
Final angle assignmentType: COMMON LINE / Software - Name: RELION (ver. 1.4)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 1.4) / Number images used: 331338

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