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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-2754 | |||||||||
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Title | Electron cryo-tomography of Campylobacter jejuni | |||||||||
![]() | Electron cryo-tomogram of two Campylobacter jejuni cells | |||||||||
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![]() | food poisoning / cryo electron tomography / cryo-EM / chemoreceptors / acidocalcisomes | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | electron tomography / cryo EM | |||||||||
![]() | Muller A / Beeby M / McDowall AW / Chow J / Jensen GJ / Clemons WM | |||||||||
![]() | ![]() Title: Ultrastructure and complex polar architecture of the human pathogen Campylobacter jejuni. Authors: Axel Müller / Morgan Beeby / Alasdair W McDowall / Janet Chow / Grant J Jensen / William M Clemons / ![]() Abstract: Campylobacter jejuni is one of the most successful food-borne human pathogens. Here we use electron cryotomography to explore the ultrastructure of C. jejuni cells in logarithmically growing cultures. ...Campylobacter jejuni is one of the most successful food-borne human pathogens. Here we use electron cryotomography to explore the ultrastructure of C. jejuni cells in logarithmically growing cultures. This provides the first look at this pathogen in a near-native state at macromolecular resolution (~5 nm). We find a surprisingly complex polar architecture that includes ribosome exclusion zones, polyphosphate storage granules, extensive collar-shaped chemoreceptor arrays, and elaborate flagellar motors. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 157.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.2 KB 10.2 KB | Display Display | ![]() |
Images | ![]() | 286 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 141.8 KB | Display | ![]() |
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Full document | ![]() | 140.7 KB | Display | |
Data in XML | ![]() | 4.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
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Links
EMDB pages | ![]() ![]() |
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Map
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Annotation | Electron cryo-tomogram of two Campylobacter jejuni cells | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 19.24 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Campylobacter jejuni subsp. jejuni ATCC 29428 (whole bacterial cells)
Entire | Name: Campylobacter jejuni subsp. jejuni ATCC 29428 (whole bacterial cells) |
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Components |
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-Supramolecule #1000: Campylobacter jejuni subsp. jejuni ATCC 29428 (whole bacterial cells)
Supramolecule | Name: Campylobacter jejuni subsp. jejuni ATCC 29428 (whole bacterial cells) type: sample / ID: 1000 / Number unique components: 1 |
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-Supramolecule #1: Campylobacter jejuni
Supramolecule | Name: Campylobacter jejuni / type: organelle_or_cellular_component / ID: 1 / Number of copies: 2 / Recombinant expression: No / Database: NCBI |
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Source (natural) | Organism: ![]() ![]() |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | electron tomography |
Aggregation state | cell |
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Sample preparation
Grid | Details: Quantifoil |
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Vitrification | Cryogen name: ETHANE-PROPANE MIXTURE / Chamber humidity: 100 % / Chamber temperature: 77 K / Instrument: FEI VITROBOT MARK III Method: Sample preparation closely followed established procedures (Iancu et al., 2007). In brief: 4 microlitres of a 10 nm colloidal gold (Sigma, USA) in 5% BSA was added to 16 microlitres of a C. ...Method: Sample preparation closely followed established procedures (Iancu et al., 2007). In brief: 4 microlitres of a 10 nm colloidal gold (Sigma, USA) in 5% BSA was added to 16 microlitres of a C. jejuni culture that had been allowed to grow to an optical density of 0.5. 3 microlitres of this mix were then placed onto a glow discharged carbon-coated R 2/2 Quantifoil grid in a Vitrobot (FEI Company, Hillsboro, OR, USA). Prior to this a 10 nm colloidal gold suspension in 5% BSA solution was added to the Quantifoil grid and allowed to dry. The temperature in the Vitrobot chamber was kept at 22 degrees Celsius with 100% humidity. Placing the sample onto the grid was followed by a 1 second blot with an offset of -1.5 degrees, a drain time of 1 second, and plunge-frozen in a mixture of liquid ethane (63%) and propane (37%). The frozen grids were than stored in liquid nitrogen until further use. |
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Electron microscopy
Microscope | FEI POLARA 300 |
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Temperature | Min: 76.9 K / Max: 77.1 K / Average: 77 K |
Specialist optics | Energy filter - Name: GATAN GIF / Energy filter - Lower energy threshold: 0.0 eV / Energy filter - Upper energy threshold: 20.0 eV |
Details | Camera post-energy filter |
Date | Jan 1, 2014 |
Image recording | Number real images: 121 / Average electron dose: 200 e/Å2 / Bits/pixel: 16 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: OTHER / Imaging mode: BRIGHT FIELD / Cs: 2.2 mm / Nominal defocus max: -12.0 µm / Nominal magnification: 22500 |
Sample stage | Specimen holder: Liquid nitrogen cooled / Specimen holder model: GATAN HELIUM / Tilt series - Axis1 - Min angle: -60 ° / Tilt series - Axis1 - Max angle: 60 ° / Tilt series - Axis1 - Angle increment: 1 ° |
Experimental equipment | ![]() Model: Tecnai Polara / Image courtesy: FEI Company |
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Image processing
Details | Single-axis tilt series from -60 degrees to 60 degrees with images were collected in 1 degree increments and an under-focus of 12 microns using a 300 keV FEI Polara FEG TEM controlled by Leginon software (Suloway et al., 2009) and the cumulative dose was not allowed to exceed 200 e A2. The images were recorded on a 4096 x 4096 pixel Ultracam (Gatan, Pleasanton, CA, USA) at a magnification of 22500 (0.98 nm/pixel). The IMOD software package (Kremer et al., 1996) was used to calculate 3D reconstructions. |
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Final reconstruction | Algorithm: OTHER / Software - Name: IMOD, tomo3d Details: SIRT reconstruction of a fine-aligned stack low-pass filtered to first zero at approximately 5.5 nanometres. Number images used: 121 |