5URW

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 24.0 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

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This is version 1.2 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: 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 ...

    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

    Howard Hughes Medical Institute, Pasadena, CA, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TssB1A1C1E1G1I1K2A2C1A1C1E1G1I1K2A2C2E2G2I2K3A3C3E3G3I3K
164Myxococcus xanthus DK 1622Mutation(s): 0 
Gene Names: MXAN_4807
Find proteins for Q1D305 (Myxococcus xanthus (strain DK 1622))
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Go to UniProtKB:  Q1D305
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TssC1B1D1F1H1J1L2B2D1B1D1F1H1J1L2B2D2F2H2J2L3B3D3F3H3J3L
494Myxococcus xanthus DK 1622Mutation(s): 0 
Gene Names: MXAN_4808
Find proteins for Q1D304 (Myxococcus xanthus (strain DK 1622))
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Go to UniProtKB:  Q1D304
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Hcp1112131415162122111213141516212223242526313233343536
163Myxococcus xanthus DK 1622Mutation(s): 0 
Gene Names: MXAN_4809
Find proteins for Q1D303 (Myxococcus xanthus (strain DK 1622))
Explore Q1D303 
Go to UniProtKB:  Q1D303
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 24.0 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

Structure Validation

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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