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- PDB-9hpm: E. coli beta-galactosidase labeled with Chromeo P503 dye purified... -

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Basic information

Entry
Database: PDB / ID: 9hpm
TitleE. coli beta-galactosidase labeled with Chromeo P503 dye purified using MISO from 1ug
ComponentsBeta-galactosidase
KeywordsHYDROLASE / Glycosyl 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 K-12 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.2 Å
AuthorsEluru, G. / De Gieter, S. / Stroobants, A. / Efremov, R.G.
Funding supportEuropean Union, Belgium, 3items
OrganizationGrant numberCountry
European Research Council (ERC)726436European Union
Research Foundation - Flanders (FWO)G0H5916N Belgium
Research Foundation - Flanders (FWO)G054617N Belgium
CitationJournal: Nat Methods / Year: 2025
Title: MISO: microfluidic protein isolation enables single-particle cryo-EM structure determination from a single cell colony.
Authors: Gangadhar Eluru / Steven De Gieter / Stephan Schenck / Annelore Stroobants / Binesh Shrestha / Paul Erbel / Janine D Brunner / Rouslan G Efremov /
Abstract: Single-particle cryogenic electron microscopy (cryo-EM) enables reconstruction of atomic-resolution 3D maps of proteins by visualizing thousands to millions of purified protein particles embedded in ...Single-particle cryogenic electron microscopy (cryo-EM) enables reconstruction of atomic-resolution 3D maps of proteins by visualizing thousands to millions of purified protein particles embedded in vitreous ice. This corresponds to picograms of purified protein, which can potentially be isolated from a few thousand cells. Hence, cryo-EM holds the potential of a very sensitive analytical method for delivering high-resolution protein structure as a readout. In practice, millions of times more starting biological material is required to prepare cryo-EM grids. Here we show that using a micro isolation (MISO) method, which combines microfluidics-based protein purification with cryo-EM grid preparation, cryo-EM structures of soluble bacterial and eukaryotic membrane proteins can be solved starting from less than 1 µg of a target protein and progressing from cells to cryo-EM grids within a few hours. This scales down the amount of starting biological material hundreds to thousands of times, opening possibilities for the structural characterization of hitherto inaccessible proteins.
History
DepositionDec 13, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Nov 5, 2025Provider: repository / Type: Initial release
Revision 1.1Nov 26, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Beta-galactosidase
B: Beta-galactosidase
C: Beta-galactosidase
D: Beta-galactosidase


Theoretical massNumber of molelcules
Total (without water)469,9544
Polymers469,9544
Non-polymers00
Water42,1732341
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein
Beta-galactosidase / Beta-gal / Lactase


Mass: 117488.375 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli K-12 (bacteria) / Strain: K-12 / Gene: lacZ, b0344, JW0335 / Production host: Escherichia coli (E. coli) / References: UniProt: P00722, beta-galactosidase
#2: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 2341 / Source method: isolated from a natural source / Formula: H2O
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Beta-galactosidase / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
Details: 25 mM HEPES pH 8.0, 100 mM NaCl, 500 mM imidazole and 1mM TCEP
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: Beta-galactosidase labeled with Chromeo P503 dye
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

MicroscopyModel: JEOL CRYO ARM 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1700 nm / Nominal defocus min: 800 nm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 2.796 sec. / Electron dose: 60.5 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3994
EM imaging opticsEnergyfilter name: In-column Omega Filter / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
2PHENIX1.20.1_4487model refinement
3SerialEM3.8.0image acquisition
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 80443 / Symmetry type: POINT
RefinementHighest resolution: 2.2 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00232424
ELECTRON MICROSCOPYf_angle_d0.49844224
ELECTRON MICROSCOPYf_dihedral_angle_d4.8514288
ELECTRON MICROSCOPYf_chiral_restr0.0434644
ELECTRON MICROSCOPYf_plane_restr0.0045820

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