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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-5739 | |||||||||
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Title | Electron microscopy map of the T6SS TssK component | |||||||||
![]() | EM Reconstruction of TssK | |||||||||
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![]() | TssK / Type VI secretion / Hcp / sheath assembly / EM / single-particle / three-fold | |||||||||
Function / homology | cellular_component / biological_process / molecular_function / Type VI secretion system TssK / Type VI secretion system TssK / Bacterial Type VI secretion, VC_A0110, EvfL, ImpJ, VasE / Type VI secretion system protein TssK![]() | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / negative staining / Resolution: 26.0 Å | |||||||||
![]() | Zoued A / Durand E / Bebeacua C / Brunet YR / Douzi B / Cambillau C / Cascales E / Journet L | |||||||||
![]() | ![]() Title: TssK is a trimeric cytoplasmic protein interacting with components of both phage-like and membrane anchoring complexes of the type VI secretion system. Authors: Abdelrahim Zoued / Eric Durand / Cecilia Bebeacua / Yannick R Brunet / Badreddine Douzi / Christian Cambillau / Eric Cascales / Laure Journet / ![]() Abstract: The Type VI secretion system (T6SS) is a macromolecular machine that mediates bacteria-host or bacteria-bacteria interactions. The T6SS core apparatus assembles from 13 proteins that form two sub- ...The Type VI secretion system (T6SS) is a macromolecular machine that mediates bacteria-host or bacteria-bacteria interactions. The T6SS core apparatus assembles from 13 proteins that form two sub-assemblies: a phage-like complex and a trans-envelope complex. The Hcp, VgrG, TssE, and TssB/C subunits are structurally and functionally related to components of the tail of contractile bacteriophages. This phage-like structure is thought to be anchored to the membrane by a trans-envelope complex composed of the TssJ, TssL, and TssM proteins. However, how the two sub-complexes are connected remains unknown. Here we identify TssK, a protein that establishes contacts with the two T6SS sub-complexes through direct interactions with TssL, Hcp, and TssC. TssK is a cytoplasmic protein assembling trimers that display a three-armed shape, as revealed by TEM and SAXS analyses. Fluorescence microscopy experiments further demonstrate the requirement of TssK for sheath assembly. Our results suggest a central role for TssK by linking both complexes during T6SS assembly. | |||||||||
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 | ![]() | 944 KB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.4 KB 10.4 KB | Display Display | ![]() |
Images | ![]() | 42.8 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
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Annotation | EM Reconstruction of TssK | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 3.5 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 : Purified TssK sample
Entire | Name: Purified TssK sample |
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Components |
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-Supramolecule #1000: Purified TssK sample
Supramolecule | Name: Purified TssK sample / type: sample / ID: 1000 / Details: The sample was monodisperse. / Oligomeric state: 3 / Number unique components: 1 |
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Molecular weight | Experimental: 160 KDa / Method: Analytical size exclusion chromatography analysis |
-Macromolecule #1: Type VI secretion system protein TssK
Macromolecule | Name: Type VI secretion system protein TssK / type: protein_or_peptide / ID: 1 / Name.synonym: TssK / Number of copies: 1 / Oligomeric state: Trimer / Recombinant expression: Yes |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Experimental: 160 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | UniProtKB: Type VI secretion system protein TssK GO: biological_process, molecular_function, cellular_component InterPro: Type VI secretion system TssK |
-Experimental details
-Structure determination
Method | negative staining |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.05 mg/mL |
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Buffer | pH: 8 Details: HBS-EP buffer (10mM HEPES, 150mM NaCl, 3mM EDTA, 0.005% Polysorbate 20) |
Staining | Type: NEGATIVE Details: Purified protein was immobilized on a glow- discharged carbon grid by incubation for 1 minute, and then stained with 2% uranyl acetate for 10 seconds. |
Grid | Details: 300 mesh copper grid with thin carbon support, glow discharged for 20 seconds |
Vitrification | Cryogen name: NONE / Instrument: OTHER |
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Electron microscopy
Microscope | FEI TECNAI SPIRIT |
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Date | Nov 1, 2012 |
Image recording | Category: CCD / Film or detector model: GENERIC CCD / Number real images: 10 / Average electron dose: 10 e/Å2 / Details: CCD images |
Electron beam | Acceleration voltage: 120 kV / Electron source: LAB6 |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 2.0 µm / Nominal magnification: 60000 |
Sample stage | Specimen holder: Room temperature holder / Specimen holder model: SIDE ENTRY, EUCENTRIC |
Experimental equipment | ![]() Model: Tecnai Spirit / Image courtesy: FEI Company |
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Image processing
Details | The particles were submitted to maximum likelihood classification and alignment. |
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Final reconstruction | Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 26.0 Å / Resolution method: OTHER / Software - Name: EMAN, SPIDER, XMIPP / Number images used: 5000 |
Final angle assignment | Details: ML |
Final two d classification | Number classes: 500 |