Crystal structure of the periplasmic domain of InvG

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

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A Refined Model of the Prototypical Salmonella SPI-1 T3SS Basal Body Reveals the Molecular Basis for Its Assembly.

Bergeron, J.R.Worrall, L.J.Sgourakis, N.G.Dimaio, F.Pfuetzner, R.A.Felise, H.B.Vuckovic, M.Yu, A.C.Miller, S.I.Baker, D.Strynadka, N.C.

(2013) PLoS Pathog 9: e1003307-e1003307

  • DOI: https://doi.org/10.1371/journal.ppat.1003307
  • Primary Citation of Related Structures:  
    3J1V, 3J1W, 3J1X, 4G08, 4G1I, 4G2S

  • PubMed Abstract: 

    The T3SS injectisome is a syringe-shaped macromolecular assembly found in pathogenic Gram-negative bacteria that allows for the direct delivery of virulence effectors into host cells. It is composed of a "basal body", a lock-nut structure spanning both bacterial membranes, and a "needle" that protrudes away from the bacterial surface. A hollow channel spans throughout the apparatus, permitting the translocation of effector proteins from the bacterial cytosol to the host plasma membrane. The basal body is composed largely of three membrane-embedded proteins that form oligomerized concentric rings. Here, we report the crystal structures of three domains of the prototypical Salmonella SPI-1 basal body, and use a new approach incorporating symmetric flexible backbone docking and EM data to produce a model for their oligomeric assembly. The obtained models, validated by biochemical and in vivo assays, reveal the molecular details of the interactions driving basal body assembly, and notably demonstrate a conserved oligomerization mechanism.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, and Centre for Blood Research, University of British Columbia, Vancouver, British Columbia, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein InvG159Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Gene Names: invGSTM2898
Find proteins for P35672 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P35672 
Go to UniProtKB:  P35672
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35672
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 28.27α = 90
b = 56.66β = 90
c = 74.44γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
MxDCdata collection

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-08
    Type: Initial release
  • Version 1.1: 2013-05-22
    Changes: Database references
  • Version 1.2: 2019-07-17
    Changes: Data collection, Refinement description
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references