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- EMDB-43514: SPOT-RASTR - a cryo-EM specimen preparation technique that overco... -

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Basic information

Entry
Database: EMDB / ID: EMD-43514
TitleSPOT-RASTR - a cryo-EM specimen preparation technique that overcomes problems with preferred orientation and the air/water interface
Map data
Sample
  • Complex: Beta-galactosidase on lipid tubes surface
    • Protein or peptide: Beta-galactosidase
  • Ligand: MAGNESIUM ION
Keywordsglycoside hydrolase / lipid binding / HYDROLASE
Function / homology
Function and homology information


lactose catabolic process / beta-galactosidase complex / beta-galactosidase / beta-galactosidase activity / carbohydrate binding / magnesium ion binding
Similarity search - Function
Glycoside hydrolase, family 2, beta-galactosidase / Beta galactosidase small chain/ domain 5 / Beta-galactosidase, domain 4 / Beta galactosidase small chain / Beta-galactosidase, domain 4 / Beta galactosidase small chain / : / Glycoside hydrolase, family 2, active site / Glycosyl hydrolases family 2 acid/base catalyst. / Glycoside hydrolase, family 2, conserved site ...Glycoside hydrolase, family 2, beta-galactosidase / Beta galactosidase small chain/ domain 5 / Beta-galactosidase, domain 4 / Beta galactosidase small chain / Beta-galactosidase, domain 4 / Beta galactosidase small chain / : / Glycoside hydrolase, family 2, active site / Glycosyl hydrolases family 2 acid/base catalyst. / Glycoside hydrolase, family 2, conserved site / Glycosyl hydrolases family 2 signature 1. / Glycoside hydrolase, family 2 / Glycosyl hydrolases family 2, sugar binding domain / Glycoside hydrolase family 2, catalytic domain / Glycosyl hydrolases family 2, sugar binding domain / Glycosyl hydrolases family 2, TIM barrel domain / Glycoside hydrolase, family 2, immunoglobulin-like beta-sandwich / Glycosyl hydrolases family 2 / Beta-Galactosidase/glucuronidase domain superfamily / Glycoside hydrolase-type carbohydrate-binding / Galactose mutarotase-like domain superfamily / Galactose-binding-like domain superfamily / Glycoside hydrolase superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.58 Å
AuthorsEsfahani BG / Randolph P / Peng R / Grant T / Stroupe ME / Stagg SM
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM148734 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM148734 United States
CitationJournal: PNAS Nexus / Year: 2024
Title: SPOT-RASTR-A cryo-EM specimen preparation technique that overcomes problems with preferred orientation and the air/water interface.
Authors: Behrouz G Esfahani / Peter S Randolph / Ruizhi Peng / Timothy Grant / M Elizabeth Stroupe / Scott M Stagg /
Abstract: In cryogenic electron microscopy (cryo-EM), specimen preparation remains a bottleneck despite recent advancements. Classical plunge freezing methods often result in issues like aggregation and ...In cryogenic electron microscopy (cryo-EM), specimen preparation remains a bottleneck despite recent advancements. Classical plunge freezing methods often result in issues like aggregation and preferred orientations at the air/water interface. Many alternative methods have been proposed, but there remains a lack a universal solution, and multiple techniques are often required for challenging samples. Here, we demonstrate the use of lipid nanotubes with nickel NTA headgroups as a platform for cryo-EM sample preparation. His-tagged specimens of interest are added to the tubules, and they can be frozen by conventional plunge freezing. We show that the nanotubes protect samples from the air/water interface and promote a wider range of orientations. The reconstruction of average subtracted tubular regions (RASTR) method allows for the removal of the nanotubule signal from the cryo-EM images resulting in isolated images of specimens of interest. Testing with β-galactosidase validates the method's ability to capture particles at lower concentrations, overcome preferred orientations, and achieve near-atomic resolution reconstructions. Since the nanotubules can be identified and targeted automatically at low magnification, the method enables fully automated data collection. Furthermore, the particles on the tubes can be automatically identified and centered using 2D classification enabling particle picking without requiring prior information. Altogether, our approach that we call specimen preparation on a tube RASTR holds promise for overcoming air-water interface and preferred orientation challenges and offers the potential for fully automated cryo-EM data collection and structure determination.
History
DepositionJan 25, 2024-
Header (metadata) releaseAug 21, 2024-
Map releaseAug 21, 2024-
UpdateAug 21, 2024-
Current statusAug 21, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_43514.png

Downloads & links

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Map

FileDownload / File: emd_43514.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.44 Å/pix.
x 192 pix.
= 276.48 Å		1.44 Å/pix.
x 192 pix.
= 276.48 Å		1.44 Å/pix.
x 192 pix.
= 276.48 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.44 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.11
Minimum - Maximum-0.0017734601 - 1.815375
Average (Standard dev.)0.0048684645 (±0.052382216)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions192192192
Spacing192192192
CellA=B=C: 276.48 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_43514_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_43514_half_map_2.map
Projections & Slices
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Sample components

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Entire : Beta-galactosidase on lipid tubes surface

EntireName: Beta-galactosidase on lipid tubes surface
Components
  • Complex: Beta-galactosidase on lipid tubes surface
    • Protein or peptide: Beta-galactosidase
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Beta-galactosidase on lipid tubes surface

SupramoleculeName: Beta-galactosidase on lipid tubes surface / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 466 KDa

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Macromolecule #1: Beta-galactosidase

MacromoleculeName: Beta-galactosidase / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO / EC number: beta-galactosidase
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 116.370188 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: MITDSLAVVL QRRDWENPGV TQLNRLAAHP PFASWRNSEE ARTDRPSQQL RSLNGEWRFA WFPAPEAVPE SWLECDLPEA DTVVVPSNW QMHGYDAPIY TNVTYPITVN PPFVPTENPT GCYSLTFNVD ESWLQEGQTR IIFDGVNSAF HLWCNGRWVG Y GQDSRLPS ...String:
MITDSLAVVL QRRDWENPGV TQLNRLAAHP PFASWRNSEE ARTDRPSQQL RSLNGEWRFA WFPAPEAVPE SWLECDLPEA DTVVVPSNW QMHGYDAPIY TNVTYPITVN PPFVPTENPT GCYSLTFNVD ESWLQEGQTR IIFDGVNSAF HLWCNGRWVG Y GQDSRLPS EFDLSAFLRA GENRLAVMVL RWSDGSYLED QDMWRMSGIF RDVSLLHKPT TQISDFHVAT RFNDDFSRAV LE AEVQMCG ELRDYLRVTV SLWQGETQVA SGTAPFGGEI IDERGGYADR VTLRLNVENP KLWSAEIPNL YRAVVELHTA DGT LIEAEA CDVGFREVRI ENGLLLLNGK PLLIRGVNRH EHHPLHGQVM DEQTMVQDIL LMKQNNFNAV RCSHYPNHPL WYTL CDRYG LYVVDEANIE THGMVPMNRL TDDPRWLPAM SERVTRMVQR DRNHPSVIIW SLGNESGHGA NHDALYRWIK SVDPS RPVQ YEGGGADTTA TDIICPMYAR VDEDQPFPAV PKWSIKKWLS LPGETRPLIL CEYAHAMGNS LGGFAKYWQA FRQYPR LQG GFVWDWVDQS LIKYDENGNP WSAYGGDFGD TPNDRQFCMN GLVFADRTPH PALTEAKHQQ QFFQFRLSGQ TIEVTSE YL FRHSDNELLH WMVALDGKPL ASGEVPLDVA PQGKQLIELP ELPQPESAGQ LWLTVRVVQP NATAWSEAGH ISAWQQWR L AENLSVTLPA ASHAIPHLTT SEMDFCIELG NKRWQFNRQS GFLSQMWIGD KKQLLTPLRD QFTRAPLDND IGVSEATRI DPNAWVERWK AAGHYQAEAA LLQCTADTLA DAVLITTAHA WQHQGKTLFI SRKTYRIDGS GQMAITVDVE VASDTPHPAR IGLNCQLAQ VAERVNWLGL GPQENYPDRL TAACFDRWDL PLSDMYTPYV FPSENGLRCG TRELNYGPHQ WRGDFQFNIS R YSQQQLME TSHRHLLHAE EGTWLNIDGF HMGIGGDDSW SPSVSAEFQL SAGRYHYQLV WCQK

UniProtKB: Beta-galactosidase

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Macromolecule #2: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 2 / Number of copies: 4 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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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: 6.8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: EMDB MAP
EMDB ID:

5995

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.58 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 145454
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE
FSC plot (resolution estimation)

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