6F2D

A FliPQR complex forms the core of the Salmonella type III secretion system export apparatus.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

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: 583-590

  • DOI: 10.1038/s41594-018-0086-9
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Export of proteins through type III secretion systems is critical for motility and virulence of many major bacterial pathogens. Three putative integral membrane proteins (FliP, FliQ, FliR) are suggested to form the core of an export gate in the inner ...

    Export of proteins through type III secretion systems is critical for motility and virulence of many major bacterial pathogens. Three putative integral membrane proteins (FliP, FliQ, FliR) are suggested to form the core of an export gate in the inner membrane, but their structure, assembly and location within the final nanomachine remain unclear. Here, we present the cryoelectron microscopy structure of the Salmonella Typhimurium FliP-FliQ-FliR complex at 4.2 Å. None of the subunits adopt canonical integral membrane protein topologies, and common helix-turn-helix structural elements allow them to form a helical assembly with 5:4:1 stoichiometry. Fitting of the structure into reconstructions of intact secretion systems, combined with cross-linking, localize the export gate as a core component of the periplasmic portion of the machinery. This study thereby identifies the export gate as a key element of the secretion channel and implies that it primes the helical architecture of the components assembling downstream.


    Organizational Affiliation

    Central Oxford Structural Microscopy and Imaging Centre, University of Oxford, Oxford, UK. susan.lea@path.ox.ac.uk.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Flagellar biosynthetic protein FliPA, B, C, D, E245Salmonella entericaMutation(s): 0 
Gene Names: fliPLTSERUB_0568
Find proteins for P54700 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P54700 
Go to UniProtKB:  P54700
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Flagellar biosynthetic protein FliRF303Salmonella entericaMutation(s): 0 
Gene Names: fliRflaPSTM1981
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: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Flagellar biosynthetic protein FliQG, H, I, J89Salmonella entericaMutation(s): 0 
Gene Names: fliQflaQSTY2188t0897
Find proteins for P0A1L5 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1L5 
Go to UniProtKB:  P0A1L5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 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

Revision History 

  • Version 1.0: 2018-07-04
    Type: Initial release
  • Version 1.1: 2018-07-18
    Changes: Data collection, Database references
  • Version 1.2: 2018-07-25
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-11
    Changes: Other