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- EMDB-27900: MicroED structure of proteinase K recorded on K2 -

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Basic information

Entry
Database: EMDB / ID: EMD-27900
TitleMicroED structure of proteinase K recorded on K2
Map data2mFo-DFc
Sample
  • Complex: Proteinase K
    • Protein or peptide: Proteinase K
  • Ligand: CALCIUM ION
Function / homology
Function and homology information


peptidase K / serine-type endopeptidase activity / proteolysis / extracellular space / metal ion binding
Similarity search - Function
Proteinase K-like catalytic domain / Peptidase S8 propeptide/proteinase inhibitor I9 / Peptidase inhibitor I9 / : / Peptidase S8 propeptide/proteinase inhibitor I9 superfamily / Peptidase S8, subtilisin, His-active site / Serine proteases, subtilase family, histidine active site. / Serine proteases, subtilase family, aspartic acid active site. / Peptidase S8, subtilisin, Asp-active site / Serine proteases, subtilase family, serine active site. ...Proteinase K-like catalytic domain / Peptidase S8 propeptide/proteinase inhibitor I9 / Peptidase inhibitor I9 / : / Peptidase S8 propeptide/proteinase inhibitor I9 superfamily / Peptidase S8, subtilisin, His-active site / Serine proteases, subtilase family, histidine active site. / Serine proteases, subtilase family, aspartic acid active site. / Peptidase S8, subtilisin, Asp-active site / Serine proteases, subtilase family, serine active site. / Peptidase S8, subtilisin, Ser-active site / Peptidase S8, subtilisin-related / Serine proteases, subtilase domain profile. / Peptidase S8/S53 domain superfamily / Peptidase S8/S53 domain / Subtilase family
Similarity search - Domain/homology
Biological speciesParengyodontium album (fungus)
Methodelectron crystallography / cryo EM
AuthorsClabbers MTB / Martynowycz MW / Hattne J / Nannenga BL / Gonen T
Funding support United States, 2 items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)P41GM136508 United States
CitationJournal: J Struct Biol / Year: 2022
Title: Electron-counting MicroED data with the K2 and K3 direct electron detectors.
Authors: Max T B Clabbers / Michael W Martynowycz / Johan Hattne / Brent L Nannenga / Tamir Gonen /
Abstract: Microcrystal electron diffraction (MicroED) uses electron cryo-microscopy (cryo-EM) to collect diffraction data from small crystals during continuous rotation of the sample. As a result of advances ...Microcrystal electron diffraction (MicroED) uses electron cryo-microscopy (cryo-EM) to collect diffraction data from small crystals during continuous rotation of the sample. As a result of advances in hardware as well as methods development, the data quality has continuously improved over the past decade, to the point where even macromolecular structures can be determined ab initio. Detectors suitable for electron diffraction should ideally have fast readout to record data in movie mode, and high sensitivity at low exposure rates to accurately report the intensities. Direct electron detectors are commonly used in cryo-EM imaging for their sensitivity and speed, but despite their availability are generally not used in diffraction. Primary concerns with diffraction experiments are the dynamic range and coincidence loss, which will corrupt the measurement if the flux exceeds the count rate of the detector. Here, we describe instrument setup and low-exposure MicroED data collection in electron-counting mode using K2 and K3 direct electron detectors and show that the integrated intensities can be effectively used to solve structures of two macromolecules between 1.2 Å and 2.8 Å resolution. Even though a beam stop was not used with the K3 studies we did not observe damage to the camera. As these cameras are already available in many cryo-EM facilities, this provides opportunities for users who do not have access to dedicated facilities for MicroED.
History
DepositionAug 19, 2022-
Header (metadata) releaseSep 21, 2022-
Map releaseSep 21, 2022-
UpdateOct 19, 2022-
Current statusOct 19, 2022Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_27900.png

Downloads & links

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Map

FileDownload / File: emd_27900.map.gz / Format: CCP4 / Size: 2.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotation2mFo-DFc
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesX (Sec.)Y (Row.)Z (Col.)
0.68 Å/pix.
x 77 pix.
= 52.029 Å		0.68 Å/pix.
x 86 pix.
= 58.11 Å		0.63 Å/pix.
x 87 pix.
= 54.871 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

generated in cubic-lattice coordinate

Voxel sizeX: 0.6757 Å / Y: 0.6757 Å / Z: 0.6307 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 1.0
Minimum - Maximum-3.4274244 - 5.2970467
Average (Standard dev.)-0.002652035 (±0.97700477)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin-68-45-7
Dimensions868777
Spacing778687
CellA: 52.0289 Å / B: 58.1102 Å / C: 54.8709 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Proteinase K

EntireName: Proteinase K
Components
  • Complex: Proteinase K
    • Protein or peptide: Proteinase K
  • Ligand: CALCIUM ION

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Supramolecule #1: Proteinase K

SupramoleculeName: Proteinase K / type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: #1 / Details: Serine protease
Source (natural)Organism: Parengyodontium album (fungus)
Recombinant expressionOrganism: Parengyodontium album (fungus)
Molecular weightTheoretical: 28.9 KDa

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Macromolecule #1: Proteinase K

MacromoleculeName: Proteinase K / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: peptidase K
Source (natural)Organism: Parengyodontium album (fungus)
Molecular weightTheoretical: 28.930783 KDa
Recombinant expressionOrganism: Parengyodontium album (fungus)
SequenceString: AAQTNAPWGL ARISSTSPGT STYYYDESAG QGSCVYVIDT GIEASHPEFE GRAQMVKTYY YSSRDGNGHG THCAGTVGSR TYGVAKKTQ LFGVKVLDDN GSGQYSTIIA GMDFVASDKN NRNCPKGVVA SLSLGGGYSS SVNSAAARLQ SSGVMVAVAA G NNNADARN ...String:
AAQTNAPWGL ARISSTSPGT STYYYDESAG QGSCVYVIDT GIEASHPEFE GRAQMVKTYY YSSRDGNGHG THCAGTVGSR TYGVAKKTQ LFGVKVLDDN GSGQYSTIIA GMDFVASDKN NRNCPKGVVA SLSLGGGYSS SVNSAAARLQ SSGVMVAVAA G NNNADARN YSPASEPSVC TVGASDRYDR RSSFSNYGSV LDIFGPGTSI LSTWIGGSTR SISGTSMATP HVAGLAAYLM TL GKTTAAS ACRYIADTAN KGDLSNIPFG TVNLLAYNNY QA

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Macromolecule #2: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 2 / Number of copies: 4 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingelectron crystallography
Aggregation state3D array

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Sample preparation

Concentration50 mg/mL
BufferpH: 8
GridModel: Quantifoil R2/1 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 10.0 nm
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: LEICA PLUNGER
DetailsMicrocrystals

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Electron microscopy

MicroscopeFEI TITAN KRIOS
TemperatureMin: 77.0 K / Max: 90.0 K
Image recordingFilm or detector model: GATAN K2 BASE (4k x 4k) / Digitization - Dimensions - Width: 1650 pixel / Digitization - Dimensions - Height: 1470 pixel / Digitization - Sampling interval: 10.0 µm / Number grids imaged: 1 / Number real images: 1 / Number diffraction images: 1600 / Average exposure time: 0.025 sec. / Average electron dose: 0.01 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: DIFFRACTION / Cs: 2.7 mm / Camera length: 590 mm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution method: DIFFRACTION PATTERN/LAYERLINES / Software - Name: REFMAC
Crystal parametersUnit cell - A: 67.57 Å / Unit cell - B: 67.57 Å / Unit cell - C: 100.91 Å / Unit cell - γ: 90 ° / Unit cell - α: 90 ° / Unit cell - β: 90 ° / Space group: P 43 21 2
Merging software listSoftware - Name: AIMLESS
Crystallography statisticsNumber intensities measured: 30326 / Number structure factors: 5453 / Fourier space coverage: 83 / R sym: 30 / R merge: 64 / Overall phase error: 28 / Overall phase residual: 0 / Phase error rejection criteria: None / High resolution: 2.7 Å / Shell - Shell ID: 1 / Shell - High resolution: 2.7 Å / Shell - Low resolution: 3.4 Å / Shell - Number structure factors: 2499 / Shell - Phase residual: 33 / Shell - Fourier space coverage: 83 / Shell - Multiplicity: 6

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Atomic model buiding 1

RefinementSpace: RECIPROCAL / Protocol: RIGID BODY FIT / Overall B value: 20.32 / Target criteria: Maximum liklihood
Output model

PDB-8e52:
MicroED structure of proteinase K recorded on K2

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