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- EMDB-43623: Human PRC2 - AavLEA1 (1:12 molar ratio) -

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Open data


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Basic information

Entry
Database: EMDB / ID: EMD-43623
TitleHuman PRC2 - AavLEA1 (1:12 molar ratio)
Map data
Sample
  • Complex: Human polycomb repressive complex 2
KeywordsPRC2 / AavLEA1 / air-water-interface / DNA BINDING PROTEIN
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.62 Å
AuthorsAbe KM / Li G / Grant T / Lim CJ
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)T32 GM130550 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R00GM131023 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)DP2GM150023 United States
CitationJournal: Nat Commun / Year: 2024
Title: Small LEA proteins mitigate air-water interface damage to fragile cryo-EM samples during plunge freezing.
Authors: Kaitlyn M Abe / Gan Li / Qixiang He / Timothy Grant / Ci Ji Lim /
Abstract: Air-water interface (AWI) interactions during cryo-electron microscopy (cryo-EM) sample preparation cause significant sample loss, hindering structural biology research. Organisms like nematodes and ...Air-water interface (AWI) interactions during cryo-electron microscopy (cryo-EM) sample preparation cause significant sample loss, hindering structural biology research. Organisms like nematodes and tardigrades produce Late Embryogenesis Abundant (LEA) proteins to withstand desiccation stress. Here we show that these LEA proteins, when used as additives during plunge freezing, effectively mitigate AWI damage to fragile multi-subunit molecular samples. The resulting high-resolution cryo-EM maps are comparable to or better than those obtained using existing AWI damage mitigation methods. Cryogenic electron tomography reveals that particles are localized at specific interfaces, suggesting LEA proteins form a barrier at the AWI. This interaction may explain the observed sample-dependent preferred orientation of particles. LEA proteins offer a simple, cost-effective, and adaptable approach for cryo-EM structural biologists to overcome AWI-related sample damage, potentially revitalizing challenging projects and advancing the field of structural biology.
History
DepositionFeb 5, 2024-
Header (metadata) releaseDec 18, 2024-
Map releaseDec 18, 2024-
UpdateDec 18, 2024-
Current statusDec 18, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_43623.png

Downloads & links

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Map

FileDownload / File: emd_43623.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 320 pix.
= 340.48 Å		1.06 Å/pix.
x 320 pix.
= 340.48 Å		1.06 Å/pix.
x 320 pix.
= 340.48 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.064 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.155
Minimum - Maximum-1.092819 - 1.6121799
Average (Standard dev.)0.00021782263 (±0.02477685)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 340.48 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_43623_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_43623_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Human polycomb repressive complex 2

EntireName: Human polycomb repressive complex 2
Components
  • Complex: Human polycomb repressive complex 2

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Supramolecule #1: Human polycomb repressive complex 2

SupramoleculeName: Human polycomb repressive complex 2 / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Homo sapiens (human)

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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

Concentration0.33 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
25.0 mMHEPESHEPES
150.0 mMNaClsodium chloride
1.0 mMTCEPTCEP
GridModel: C-flat-1.2/1.3 / Material: GOLD / Mesh: 300
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Specialist opticsEnergy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.62 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 388404
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE
FSC plot (resolution estimation)

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