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Yorodumi- EMDB-26007: Three-dimensional organization of the apical complex in Toxoplasm... -
+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-26007 | ||||||||||||||||||
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Title | Three-dimensional organization of the apical complex in Toxoplasma tachyzoites | ||||||||||||||||||
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Sample |
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Keywords | Parasites / Toxoplasma gondii / apical end / cryoET / CELL INVASION | ||||||||||||||||||
Biological species | Toxoplasma gondii (eukaryote) | ||||||||||||||||||
Method | electron tomography / cryo EM | ||||||||||||||||||
Authors | Sun SY / Segev-Zarko L | ||||||||||||||||||
Funding support | United States, 5 items
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Citation | Journal: Proc Natl Acad Sci U S A / Year: 2022 Title: Cryo-ET of parasites gives subnanometer insight into tubulin-based structures. Authors: Stella Y Sun / Li-Av Segev-Zarko / Muyuan Chen / Grigore D Pintilie / Michael F Schmid / Steven J Ludtke / John C Boothroyd / Wah Chiu / Abstract: Tubulin is a conserved protein that polymerizes into different forms of filamentous structures in , an obligate intracellular parasite in the phylum Apicomplexa. Two key tubulin-containing ...Tubulin is a conserved protein that polymerizes into different forms of filamentous structures in , an obligate intracellular parasite in the phylum Apicomplexa. Two key tubulin-containing cytoskeletal components are subpellicular microtubules (SPMTs) and conoid fibrils (CFs). The SPMTs help maintain shape and gliding motility, while the CFs are implicated in invasion. Here, we use cryogenic electron tomography to determine the molecular structures of the SPMTs and CFs in vitrified intact and detergent-extracted parasites. Subvolume densities from detergent-extracted parasites yielded averaged density maps at subnanometer resolutions, and these were related back to their architecture in situ. An intralumenal spiral lines the interior of the 13-protofilament SPMTs, revealing a preferred orientation of these microtubules relative to the parasite's long axis. Each CF is composed of nine tubulin protofilaments that display a comma-shaped cross-section, plus additional associated components. Conoid protrusion, a crucial step in invasion, is associated with an altered pitch of each CF. The use of basic building blocks of protofilaments and different accessory proteins in one organism illustrates the versatility of tubulin to form two distinct types of assemblies, SPMTs and CFs. | ||||||||||||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_26007.map.gz | 953 MB | EMDB map data format | |
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Header (meta data) | emd-26007-v30.xml emd-26007.xml | 10.9 KB 10.9 KB | Display Display | EMDB header |
Images | emd_26007.png | 129.9 KB | ||
Filedesc metadata | emd-26007.cif.gz | 4 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-26007 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-26007 | HTTPS FTP |
-Related structure data
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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-Map
File | Download / File: emd_26007.map.gz / Format: CCP4 / Size: 1 GB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Voxel size | X=Y=Z: 14.172 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
-Entire : 3D reconstruction and annotation of distinct secretory organelles...
Entire | Name: 3D reconstruction and annotation of distinct secretory organelles and cytoskeleton elements in the apical region of Toxoplasma gondii |
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Components |
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-Supramolecule #1: 3D reconstruction and annotation of distinct secretory organelles...
Supramolecule | Name: 3D reconstruction and annotation of distinct secretory organelles and cytoskeleton elements in the apical region of Toxoplasma gondii type: cell / ID: 1 / Parent: 0 |
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Source (natural) | Organism: Toxoplasma gondii (eukaryote) |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | electron tomography |
Aggregation state | cell |
-Sample preparation
Buffer | pH: 7.2 Details: Hanks balanced salts solution, supplemented (HBSS): 1 mM MgCl2, 1 mM CaCl2, 10 mM NaHCO3, 20 mM HEPES, pH 7.2 |
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Grid | Model: Homemade / Support film - Material: CARBON / Support film - topology: LACEY / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 25 sec. |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 295 K / Instrument: LEICA EM GP |
Details | 3x10^6 cells/ml |
Sectioning | Other: NO SECTIONING |
Fiducial marker | Manufacturer: EMS / Diameter: 10 nm |
-Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Electron beam | Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN |
Electron optics | C2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 1.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 39000 |
Specialist optics | Phase plate: VOLTA PHASE PLATE / Energy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 2.2 e/Å2 |
Experimental equipment | Model: Talos Arctica / Image courtesy: FEI Company |
-Image processing
Final reconstruction | Software - Name: IMOD / Number images used: 41 |
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