5TCR

Atomic model of the Salmonella SPI-1 type III secretion injectisome basal body proteins InvG, PrgH, and PrgK


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.3 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

Near-atomic-resolution cryo-EM analysis of the Salmonella T3S injectisome basal body.

Worrall, L.J.Hong, C.Vuckovic, M.Deng, W.Bergeron, J.R.Majewski, D.D.Huang, R.K.Spreter, T.Finlay, B.B.Yu, Z.Strynadka, N.C.

(2016) Nature 540: 597-601

  • DOI: 10.1038/nature20576
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The type III secretion (T3S) injectisome is a specialized protein nanomachine that is critical for the pathogenicity of many Gram-negative bacteria, including purveyors of plague, typhoid fever, whooping cough, sexually transmitted infections and maj ...

    The type III secretion (T3S) injectisome is a specialized protein nanomachine that is critical for the pathogenicity of many Gram-negative bacteria, including purveyors of plague, typhoid fever, whooping cough, sexually transmitted infections and major nosocomial infections. This syringe-shaped 3.5-MDa macromolecular assembly spans both bacterial membranes and that of the infected host cell. The internal channel formed by the injectisome allows for the direct delivery of partially unfolded virulence effectors into the host cytoplasm. The structural foundation of the injectisome is the basal body, a molecular lock-nut structure composed predominantly of three proteins that form highly oligomerized concentric rings spanning the inner and outer membranes. Here we present the structure of the prototypical Salmonella enterica serovar Typhimurium pathogenicity island 1 basal body, determined using single-particle cryo-electron microscopy, with the inner-membrane-ring and outer-membrane-ring oligomers defined at 4.3 Å and 3.6 Å resolution, respectively. This work presents the first, to our knowledge, high-resolution structural characterization of the major components of the basal body in the assembled state, including that of the widespread class of outer-membrane portals known as secretins.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology and the Center for Blood Research, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein InvG
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O
562Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Gene Names: invG
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Type III Secretion Systems
Protein: 
TS3 injectisome basal body
Find proteins for P35672 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P35672
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Lipoprotein PrgK
P, R, T, V, X, a, c, e, g, i, k, m, o, q, s, u, w, y, z, 1, 3, 5, 7, 9
235Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Gene Names: prgK
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Type III Secretion Systems
Protein: 
TS3 injectisome basal body
Find proteins for P41786 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P41786
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Protein PrgH
Q, S, U, W, Y, Z, b, d, f, h, j, l, n, p, r, t, v, x, 0, 2, 4, 6, 8, 10
263Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Gene Names: prgH
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Type III Secretion Systems
Protein: 
TS3 injectisome basal body
Find proteins for P41783 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P41783
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.3 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health ResearchCanada--

Revision History 

  • Version 1.0: 2016-12-21
    Type: Initial release
  • Version 1.1: 2017-01-11
    Type: Database references
  • Version 1.2: 2017-09-13
    Type: Author supporting evidence, Data collection
  • Version 1.3: 2018-07-18
    Type: Data collection, Experimental preparation