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- PDB-5urx: Structure of the contracted type VI secretion system sheath in My... -
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Basic information
Entry | Database: PDB / ID: 5urx | ||||||
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Title | Structure of the contracted type VI secretion system sheath in Myxococcus xanthus | ||||||
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![]() | PROTEIN TRANSPORT / T6SS / type IV secretion / protein machine / secretion system / sheath / contractile | ||||||
Function / homology | Type VI secretion system TssC-like / TssC1, N-terminal / TssC1, C-terminal / EvpB/VC_A0108, tail sheath N-terminal domain / EvpB/VC_A0108, tail sheath gpW/gp25-like domain / Type VI secretion system sheath protein TssB1 / Type VI secretion system, VipA, VC_A0107 or Hcp2 / Type VI secretion protein / Type VI secretion system-associated protein![]() | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / subtomogram averaging / cryo EM / Resolution: 28 Å | ||||||
![]() | Chang, Y.-W. / Rettberg, L.A. / Jensen, G.J. | ||||||
![]() | ![]() Title: structures of an intact type VI secretion system revealed by electron cryotomography. Authors: Yi-Wei Chang / Lee A Rettberg / Davi R Ortega / Grant J Jensen / ![]() Abstract: The type VI secretion system (T6SS) is a versatile molecular weapon used by many bacteria against eukaryotic hosts or prokaryotic competitors. It consists of a cytoplasmic bacteriophage tail-like ...The type VI secretion system (T6SS) is a versatile molecular weapon used by many bacteria against eukaryotic hosts or prokaryotic competitors. It consists of a cytoplasmic bacteriophage tail-like structure anchored in the bacterial cell envelope via a cytoplasmic baseplate and a periplasmic membrane complex. Rapid contraction of the sheath in the bacteriophage tail-like structure propels an inner tube/spike complex through the target cell envelope to deliver effectors. While structures of purified contracted sheath and purified membrane complex have been solved, because sheaths contract upon cell lysis and purification, no structure is available for the extended sheath. Structural information about the baseplate is also lacking. Here, we use electron cryotomography to directly visualize intact T6SS structures inside cells. Using sub-tomogram averaging, we resolve the structure of the extended sheath and membrane-associated components including the baseplate. Moreover, we identify novel extracellular bacteriophage tail fiber-like antennae. These results provide new structural insights into how the extended sheath prevents premature disassembly and how this sophisticated machine may recognize targets. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 1.2 MB | Display | ![]() |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 8602MC ![]() 8600C ![]() 8601C ![]() 5urwC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 18016.617 Da / Num. of mol.: 18 / Source method: isolated from a natural source / Source: (natural) ![]() #2: Protein | Mass: 56188.469 Da / Num. of mol.: 18 / Source method: isolated from a natural source / Source: (natural) ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: CELL / 3D reconstruction method: subtomogram averaging |
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Sample preparation
Component | Name: Type VI secretion system / Type: COMPLEX / Entity ID: all / Source: NATURAL |
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Source (natural) | Organism: ![]() |
Buffer solution | pH: 7 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE-PROPANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Tecnai Polara / Image courtesy: FEI Company |
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Microscopy | Model: FEI POLARA 300 |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 1.5 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
EM software |
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CTF correction | Type: NONE | ||||||||||||||||||
3D reconstruction | Resolution: 28 Å / Resolution method: OTHER / Num. of particles: 407 / Symmetry type: POINT | ||||||||||||||||||
EM volume selection | Num. of tomograms: 24 / Num. of volumes extracted: 407 |