2YJL

Structural characterization of a secretin pilot protein from the type III secretion system (T3SS) of Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.81 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Characterization and Membrane Localization of Exsb from the Type III Secretion System (T3Ss) of Pseudomonas Aeruginosa

Izore, T.Perdu, C.Job, V.Atree, I.Faudry, E.Dessen, A.

(2011) J.Mol.Biol. 413: 236

  • DOI: 10.1016/j.jmb.2011.07.043

  • PubMed Abstract: 
  • Pseudomonas aeruginosa is an opportunistic human pathogen that employs a finely tuned type III secretion system (T3SS) to inject toxins directly into the cytoplasm of target cells. ExsB is a 15.6-kDa protein encoded in a T3SS transcription regulation ...

    Pseudomonas aeruginosa is an opportunistic human pathogen that employs a finely tuned type III secretion system (T3SS) to inject toxins directly into the cytoplasm of target cells. ExsB is a 15.6-kDa protein encoded in a T3SS transcription regulation operon that displays high sequence similarity to YscW, a lipoprotein from Yersinia spp. whose genetic neighborhood also involves a transcriptional regulator, and has been shown to play a role in the stabilization of the outer membrane ring of the T3SS. Here, we show that ExsB is expressed in P. aeruginosa upon induction of the T3SS, and subcellular fractionation studies reveal that it is associated with the outer membrane. The high-resolution crystal structure of ExsB shows that it displays a compact β-sandwich fold with interdependent β-sheets. ExsB possesses a large patch of basic residues that could play a role in membrane recognition, and its structure is distinct from that of MxiM, a lipoprotein involved in secretin stabilization in Shigella, as well as from those of Pil lipoproteins involved in pilus biogenesis. These results reveal that small lipoproteins involved in formation of the outer membrane secretin ring display clear structural differences that may be related to the different functions they play in these systems.


    Organizational Affiliation

    Bacterial Pathogenesis Group, Institut de Biologie Structurale (IBS), Université Grenoble I, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EXOENZYME S SYNTHESIS PROTEIN B
A, B, C
125Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)Mutation(s): 0 
Gene Names: exsB
Find proteins for P26994 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  P26994
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, C
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
NI
Query on NI

Download SDF File 
Download CCD File 
A
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.81 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.217 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 124.155α = 90.00
b = 48.358β = 96.92
c = 71.602γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
REFMACrefinement
XDSdata reduction
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-08-10
    Type: Initial release
  • Version 1.1: 2011-10-12
    Type: Database references