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- EMDB-21995: 1.8 Angstrom resolution structure of b-galactosidase with a 200 k... -

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Basic information

Entry
Database: EMDB / ID: EMD-21995
Title1.8 Angstrom resolution structure of b-galactosidase with a 200 kV cryoARM electron microscope
Map data
Sample
  • Complex: beta-galactosidase
    • Protein or peptide: Beta-galactosidase
  • Ligand: MAGNESIUM ION
  • Ligand: SODIUM IONSodium
  • Ligand: water
Keywordsenzyme / 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 / Glycosyl hydrolases family 2 signature 1. ...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 / Glycoside hydrolase family 2, catalytic domain / Glycosyl hydrolases family 2, TIM barrel domain / Glycoside hydrolase, family 2, immunoglobulin-like beta-sandwich / Glycosyl hydrolases family 2, sugar binding domain / Glycosyl hydrolases family 2 / Glycosyl hydrolases family 2, sugar binding domain / 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) / Escherichia coli (strain K12) (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 1.8 Å
AuthorsMerk A / Fukumura T
Funding support1 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)
CitationJournal: IUCrJ / Year: 2020
Title: 1.8 Å resolution structure of β-galactosidase with a 200 kV CRYO ARM electron microscope.
Authors: Alan Merk / Takuma Fukumura / Xing Zhu / Joseph E Darling / Reinhard Grisshammer / Jana Ognjenovic / Sriram Subramaniam /
Abstract: We report the determination of the structure of β-galactosidase at a resolution of ∼1.8 Å using data collected on a 200 kV CRYO ARM microscope equipped with a K3 direct electron detector. ...We report the determination of the structure of β-galactosidase at a resolution of ∼1.8 Å using data collected on a 200 kV CRYO ARM microscope equipped with a K3 direct electron detector. The data were collected in a single 24 h session by recording images from an array of 7 × 7 holes at each stage position using the automated data collection program . In addition to the expected features such as holes in the densities of aromatic residues, the map also shows density bumps corresponding to the locations of hydrogen atoms. The hydrogen densities are useful in assigning absolute orientations for residues such as glutamine or asparagine by removing the uncertainty in the fitting of the amide groups, and are likely to be especially relevant in the context of structure-guided drug design. These findings validate the use of electron microscopes operating at 200 kV for imaging protein complexes at atomic resolution using cryo-EM.
History
DepositionMay 19, 2020-
Header (metadata) releaseJul 1, 2020-
Map releaseJul 1, 2020-
UpdateMar 6, 2024-
Current statusMar 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0245
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.0245
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6x1q
  • Surface level: 0.0245
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21995.png

Downloads & links

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Map

FileDownload / File: emd_21995.map.gz / Format: CCP4 / Size: 1.9 GB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.26 Å
Density
Contour LevelBy AUTHOR: 0.0245 / Movie #1: 0.0245
Minimum - Maximum-0.046653315 - 0.105218075
Average (Standard dev.)0.0000033910444 (±0.0046967966)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions800800800
Spacing800800800
CellA=B=C: 208.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.260.260.26
M x/y/z800800800
origin x/y/z0.0000.0000.000
length x/y/z208.000208.000208.000
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ360360360
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS800800800
D min/max/mean-0.0470.1050.000

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Supplemental data

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Mask #1

Fileemd_21995_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_21995_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_21995_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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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
  • Ligand: MAGNESIUM ION
  • Ligand: SODIUM IONSodium
  • Ligand: water

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Supramolecule #1: beta-galactosidase

SupramoleculeName: beta-galactosidase / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 465 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 (strain K12) (bacteria) / Strain: K12
Molecular weightTheoretical: 116.181031 KDa
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 CDVGFRVVRI 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 GQMAITVDVV VASDTPHPAR IGLNCQLAQ VAERVNWLGL GPQENYPDRL TAACFDRWDL PLSDMYTPYV FPSENGLRCG TRELNYGPHQ WRGDFQFNIS R YSQQQLME TSHRHLLHAE EGTWLNIDGF HMGIGGDDSW SPSVSAEFQL SAGRYHYQLV WCQ

UniProtKB: Beta-galactosidase

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Macromolecule #2: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 2 / Number of copies: 8 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #3: SODIUM ION

MacromoleculeName: SODIUM ION / type: ligand / ID: 3 / Number of copies: 8
Molecular weightTheoretical: 22.99 Da

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Macromolecule #4: water

MacromoleculeName: water / type: ligand / ID: 4 / Number of copies: 3618 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER / Water

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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

Concentration4.5 mg/mL
BufferpH: 8 / Details: 25mM Tris pH 8.0, 50mM NaCl, 0.5mM TCEP, 2mM MgCl
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 200 / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 10 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 291 K / Instrument: LEICA EM GP
DetailsPurified by size exclusion chromatography

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Electron microscopy

MicroscopeJEOL CRYO ARM 200
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: -0.9500000000000001 µm / Nominal defocus min: -0.8 µm
Specialist opticsEnergy filter - Name: In-column Omega Filter / Energy filter - Slit width: 30 eV
Sample stageSpecimen holder model: JEOL CRYOSPECPORTER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 4949 / Average exposure time: 1.0 sec. / Average electron dose: 40.0 e/Å2

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Image processing

Particle selectionNumber selected: 998945
Startup modelType of model: EMDB MAP
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionApplied symmetry - Point group: D2 (2x2 fold dihedral) / Resolution.type: BY AUTHOR / Resolution: 1.8 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 257202
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

5a1a


Chain - Source name: PDB / Chain - Initial model type: experimental model
Output model

PDB-6x1q:
1.8 Angstrom resolution structure of b-galactosidase with a 200 kV cryoARM electron microscope

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