6R69

Improved map of the FliPQR complex that forms the core of the Salmonella type III secretion system export apparatus.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.65 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in:6f2d


Literature

The Structure of an Injectisome Export Gate Demonstrates Conservation of Architecture in the Core Export Gate between Flagellar and Virulence Type III Secretion Systems.

Johnson, S.Kuhlen, L.Deme, J.C.Abrusci, P.Lea, S.M.

(2019) mBio 10

  • DOI: 10.1128/mBio.00818-19
  • Primary Citation of Related Structures:  
    6R69, 6R6B

  • PubMed Abstract: 
  • Export of proteins through type III secretion systems (T3SS) is critical for motility and virulence of many major bacterial pathogens. Proteins are exported through a genetically defined export gate complex consisting of three proteins. We have recently shown at 4 ...

    Export of proteins through type III secretion systems (T3SS) is critical for motility and virulence of many major bacterial pathogens. Proteins are exported through a genetically defined export gate complex consisting of three proteins. We have recently shown at 4.2 Å that the flagellar complex of these three putative membrane proteins (FliPQR in flagellar systems, SctRST in virulence systems) assembles into an extramembrane helical assembly that likely seeds correct assembly of the rod. Here we present the structure of an equivalent complex from the Shigella virulence system at 3.5 Å by cryo-electron microscopy. This higher-resolution structure yields a more precise description of the structure and confirms the prediction of structural conservation in this core complex. Analysis of particle heterogeneity also suggests how the SctS/FliQ subunits sequentially assemble in the complex. IMPORTANCE Although predicted on the basis of sequence conservation, the work presented here formally demonstrates that all classes of type III secretion systems, flagellar or virulence, share the same architecture at the level of the core structures. This absolute conservation of the unusual extramembrane structure of the core export gate complex now allows work to move to focusing on both mechanistic studies of type III but also on fundamental studies of how such a complex is assembled.


    Related Citations: 
    • Structure of the core of the type III secretion system export apparatus.
      Kuhlen, L., Abrusci, P., Johnson, S., Gault, J., Deme, J., Caesar, J., Dietsche, T., Mebrhatu, M.T., Ganief, T., Macek, B., Wagner, S., Robinson, C.V., Lea, S.M.
      (2018) Nat Struct Mol Biol 25: 583

    Organizational Affiliation

    Central Oxford Structural Microscopy and Imaging Centre, University of Oxford, Oxford, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Flagellar biosynthetic protein FliPA, B, C, D, E245Salmonella entericaMutation(s): 0 
Gene Names: fliPLTSERUB_0568
Membrane Entity: Yes 
UniProt
Find proteins for G5QE81 (Salmonella enterica subsp. enterica serovar Rubislaw str. A4-653)
Explore G5QE81 
Go to UniProtKB:  G5QE81
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Flagellar biosynthetic protein FliRF303Salmonella entericaMutation(s): 0 
Gene Names: fliRflaPSTM1981
Membrane Entity: Yes 
UniProt
Find proteins for P54702 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P54702 
Go to UniProtKB:  P54702
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Flagellar biosynthetic protein FliQG, H, I, J89Salmonella entericaMutation(s): 0 
Gene Names: 
Membrane Entity: Yes 
UniProt
Find proteins for A0A0F7J7J8 (Salmonella typhimurium)
Explore A0A0F7J7J8 
Go to UniProtKB:  A0A0F7J7J8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.65 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)United KingdomM011984
Wellcome TrustUnited Kingdom100298
Wellcome TrustUnited Kingdom201536
Wolfson FoundationUnited KingdomWL160052
Wellcome TrustUnited Kingdom109136

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-29
    Type: Initial release
  • Version 1.1: 2019-07-10
    Changes: Data collection, Database references
  • Version 1.2: 2019-10-30
    Changes: Data collection, Database references
  • Version 1.3: 2019-11-06
    Changes: Data collection, Refinement description
  • Version 1.4: 2019-12-18
    Changes: Other