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- EMDB-16097: Cryo-EM structure of beta-galactosidase at 3.2 A resolution plung... -

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Basic information

Entry
Database: EMDB / ID: EMD-16097
TitleCryo-EM structure of beta-galactosidase at 3.2 A resolution plunged 35 ms after mixing with apoferritin
Map data
Sample
  • Complex: Beta-galactosidase
    • Protein or peptide: Beta-galactosidase
KeywordsGlycosyl hydrolase / HYDROLASE
Function / homology
Function and homology information


alkali metal ion binding / lactose catabolic process / beta-galactosidase complex / beta-galactosidase / beta-galactosidase activity / carbohydrate binding / magnesium ion binding / identical protein 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) / Escherichia coli K-12 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsTorino S / Dhurandhar M / Efremov R
Funding supportEuropean Union, Belgium, 3 items
OrganizationGrant numberCountry
European Research Council (ERC)726436European Union
Research Foundation - Flanders (FWO)G0H5916N Belgium
Research Foundation - Flanders (FWO)G054617N Belgium
CitationJournal: Nat Methods / Year: 2023
Title: Time-resolved cryo-EM using a combination of droplet microfluidics with on-demand jetting.
Authors: Stefania Torino / Mugdha Dhurandhar / Annelore Stroobants / Raf Claessens / Rouslan G Efremov /
Abstract: Single-particle cryogenic electron microscopy (cryo-EM) allows reconstruction of high-resolution structures of proteins in different conformations. Protein function often involves transient ...Single-particle cryogenic electron microscopy (cryo-EM) allows reconstruction of high-resolution structures of proteins in different conformations. Protein function often involves transient functional conformations, which can be resolved using time-resolved cryo-EM (trEM). In trEM, reactions are arrested after a defined delay time by rapid vitrification of protein solution on the EM grid. Despite the increasing interest in trEM among the cryo-EM community, making trEM samples with a time resolution below 100 ms remains challenging. Here we report the design and the realization of a time-resolved cryo-plunger that combines a droplet-based microfluidic mixer with a laser-induced generator of microjets that allows rapid reaction initiation and plunge-freezing of cryo-EM grids. Using this approach, a time resolution of 5 ms was achieved and the protein density map was reconstructed to a resolution of 2.1 Å. trEM experiments on GroEL:GroES chaperonin complex resolved the kinetics of the complex formation and visualized putative short-lived conformations of GroEL-ATP complex.
History
DepositionNov 9, 2022-
Header (metadata) releaseAug 9, 2023-
Map releaseAug 9, 2023-
UpdateSep 13, 2023-
Current statusSep 13, 2023Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_16097.png

Downloads & links

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Map

FileDownload / File: emd_16097.map.gz / Format: CCP4 / Size: 22.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.51 Å/pix.
x 180 pix.
= 271.8 Å		1.51 Å/pix.
x 180 pix.
= 271.8 Å		1.51 Å/pix.
x 180 pix.
= 271.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.51 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.04
Minimum - Maximum-0.098548055 - 0.20967492
Average (Standard dev.)0.00062906917 (±0.012369789)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions180180180
Spacing180180180
CellA=B=C: 271.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_16097_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_16097_half_map_1.map
Projections & Slices
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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_16097_half_map_2.map
Projections & Slices
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Sample components

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Entire : Beta-galactosidase

EntireName: Beta-galactosidase
Components
  • Complex: Beta-galactosidase
    • Protein or peptide: Beta-galactosidase

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Supramolecule #1: Beta-galactosidase

SupramoleculeName: Beta-galactosidase / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Escherichia coli (E. coli) / Strain: K12

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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 K-12 (bacteria) / Strain: K12
Molecular weightTheoretical: 117.488375 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MTMITDSLAV VLQRRDWENP GVTQLNRLAA HPPFASWRNS EEARTDRPSQ QLRSLNGEWR FAWFPAPEAV PESWLECDLP EADTVVVPS NWQMHGYDAP IYTNVTYPIT VNPPFVPTEN PTGCYSLTFN VDESWLQEGQ TRIIFDGVNS AFHLWCNGRW V GYGQDSRL ...String:
MTMITDSLAV VLQRRDWENP GVTQLNRLAA HPPFASWRNS EEARTDRPSQ QLRSLNGEWR FAWFPAPEAV PESWLECDLP EADTVVVPS NWQMHGYDAP IYTNVTYPIT VNPPFVPTEN PTGCYSLTFN VDESWLQEGQ TRIIFDGVNS AFHLWCNGRW V GYGQDSRL PSEFDLSAFL RAGENRLAVM VLRWSDGSYL EDQDMWRMSG IFRDVSLLHK PTTQISDFHV ATRFNDDFSR AV LEAEVQM CGELRDYLRV TVSLWQGETQ VASGTAPFGG EIIDERGGYA DRVTLRLNVE NPKLWSAEIP NLYRAVVELH TAD GTLIEA EACDVGFREV RIENGLLLLN GKPLLIRGVN RHEHHPLHGQ VMDEQTMVQD ILLMKQNNFN AVRCSHYPNH PLWY TLCDR YGLYVVDEAN IETHGMVPMN RLTDDPRWLP AMSERVTRMV QRDRNHPSVI IWSLGNESGH GANHDALYRW IKSVD PSRP VQYEGGGADT TATDIICPMY ARVDEDQPFP AVPKWSIKKW LSLPGETRPL ILCEYAHAMG NSLGGFAKYW QAFRQY PRL QGGFVWDWVD QSLIKYDENG NPWSAYGGDF GDTPNDRQFC MNGLVFADRT PHPALTEAKH QQQFFQFRLS GQTIEVT SE YLFRHSDNEL LHWMVALDGK PLASGEVPLD VAPQGKQLIE LPELPQPESA GQLWLTVRVV QPNATAWSEA GHISAWQQ W RLAENLSVTL PAASHAIPHL TTSEMDFCIE LGNKRWQFNR QSGFLSQMWI GDKKQLLTPL RDQFTRAPLD NDIGVSEAT RIDPNAWVER WKAAGHYQAE AALLQCTADT LADAVLITTA HAWQHQGKTL FISRKTYRID GSGQMAITVD VEVASDTPHP ARIGLNCQL AQVAERVNWL GLGPQENYPD RLTAACFDRW DLPLSDMYTP YVFPSENGLR CGTRELNYGP HQWRGDFQFN I SRYSQQQL METSHRHLLH AEEGTWLNID GFHMGIGGDD SWSPSVSAEF QLSAGRYHYQ LVWCQKGHHH HHH

UniProtKB: Beta-galactosidase

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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

Concentration2.7 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
25.0 mMHEPES4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid
100.0 mMNaClSodium Chloride
32.0 mMAcid red 27
1.0 mMTCEPTris(2-carboxyethyl)phosphine hydrochloride

Details: contains Amaranth dye (acid red 27) 32 mM
GridModel: Quantifoil R2/1 / Material: COPPER / Mesh: 300 / Support film - #0 - Film type ID: 1 / Support film - #0 - Material: CARBON / Support film - #0 - topology: CONTINUOUS / Support film - #0 - Film thickness: 3 / Support film - #1 - Film type ID: 2 / Support film - #1 - Material: CARBON / Support film - #1 - topology: HOLEY / Support film - #1 - Film thickness: 50 / Pretreatment - Type: PLASMA CLEANING
VitrificationCryogen name: ETHANE
DetailsBeta-galactosidase in buffer of Amaranth dye (acid red 27 concentration 32 mM)

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Electron microscopy

MicroscopeJEOL CRYO ARM 300
Specialist opticsEnergy filter - Name: In-column Omega Filter / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 2 / Number real images: 722 / Average exposure time: 2.796 sec. / Average electron dose: 59.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.55 mm / Nominal defocus max: 3.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 60000
Sample stageSpecimen holder model: JEOL CRYOSPECPORTER / Cooling holder cryogen: NITROGEN

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

4v40

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 6204
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-8bkg:
Cryo-EM structure of beta-galactosidase at 3.2 A resolution plunged 35 ms after mixing with apoferritin

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