4OYC

Crystal structure of the PrgK periplasmic domain 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.227 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Modular Structure of the Inner-Membrane Ring Component PrgK Facilitates Assembly of the Type III Secretion System Basal Body.

Bergeron, J.R.Worrall, L.J.De, S.Sgourakis, N.G.Cheung, A.H.Lameignere, E.Okon, M.Wasney, G.A.Baker, D.McIntosh, L.P.Strynadka, N.C.

(2015) Structure 23: 161-172

  • DOI: 10.1016/j.str.2014.10.021
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The type III secretion system (T3SS) is a large macromolecular assembly found at the surface of many pathogenic Gram-negative bacteria. Its role is to inject toxic "effector" proteins into the cells of infected organisms. The molecular details of the ...

    The type III secretion system (T3SS) is a large macromolecular assembly found at the surface of many pathogenic Gram-negative bacteria. Its role is to inject toxic "effector" proteins into the cells of infected organisms. The molecular details of the assembly of this large, multimembrane-spanning complex remain poorly understood. Here, we report structural, biochemical, and functional analyses of PrgK, an inner-membrane component of the prototypical Salmonella typhimurium T3SS. We have obtained the atomic structures of the two ring building globular domains and show that the C-terminal transmembrane helix is not essential for assembly and secretion. We also demonstrate that structural rearrangement of the two PrgK globular domains, driven by an interconnecting linker region, may promote oligomerization into ring structures. Finally, we used electron microscopy-guided symmetry modeling to propose a structural model for the intimately associated PrgH-PrgK ring interaction within the assembled basal body.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Lipoprotein PrgK
A, B
109Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Gene Names: prgK
Find proteins for P41786 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P41786
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.227 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 77.190α = 90.00
b = 34.740β = 110.77
c = 64.030γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata reduction
XDSdata scaling
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-12-03
    Type: Initial release
  • Version 1.1: 2015-01-14
    Type: Database references
  • Version 1.2: 2015-01-21
    Type: Database references
  • Version 1.3: 2015-02-04
    Type: Derived calculations