5URX

Structure of the contracted type VI secretion system sheath in Myxococcus xanthus


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 28.0 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

In vivo structures of an intact type VI secretion system revealed by electron cryotomography.

Chang, Y.W.Rettberg, L.A.Ortega, D.R.Jensen, G.J.

(2017) EMBO Rep 18: 1090-1099

  • DOI: https://doi.org/10.15252/embr.201744072
  • Primary Citation of Related Structures:  
    5URW, 5URX

  • PubMed 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 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 Myxococcus xanthus 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.


  • Organizational Affiliation

    California Institute of Technology, Pasadena, CA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TssB164Myxococcus xanthus DK 1622Mutation(s): 0 
UniProt
Find proteins for Q1D305 (Myxococcus xanthus (strain DK1622))
Explore Q1D305 
Go to UniProtKB:  Q1D305
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1D305
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
TssC494Myxococcus xanthus DK 1622Mutation(s): 0 
UniProt
Find proteins for Q1D304 (Myxococcus xanthus (strain DK1622))
Explore Q1D304 
Go to UniProtKB:  Q1D304
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1D304
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 28.0 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONTOMO3D

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-10
    Type: Initial release
  • Version 1.1: 2017-05-24
    Changes: Database references
  • Version 1.2: 2017-07-12
    Changes: Database references
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references