4G75

Structure of PaeM, a colicin M-like bacteriocin produced by Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Functional and Structural Characterization of PaeM, a Colicin M-like Bacteriocin Produced by Pseudomonas aeruginosa.

Barreteau, H.Tiouajni, M.Graille, M.Josseaume, N.Bouhss, A.Patin, D.Blanot, D.Fourgeaud, M.Mainardi, J.L.Arthur, M.van Tilbeurgh, H.Mengin-Lecreulx, D.Touze, T.

(2012) J Biol Chem 287: 37395-37405

  • DOI: 10.1074/jbc.M112.406439
  • Primary Citation of Related Structures:  
    4G75, 4G76

  • PubMed Abstract: 
  • Colicin M (ColM) is the only enzymatic colicin reported to date that inhibits cell wall peptidoglycan biosynthesis. It catalyzes the specific degradation of the lipid intermediates involved in this pathway, thereby provoking lysis of susceptible Escherichia coli cells ...

    Colicin M (ColM) is the only enzymatic colicin reported to date that inhibits cell wall peptidoglycan biosynthesis. It catalyzes the specific degradation of the lipid intermediates involved in this pathway, thereby provoking lysis of susceptible Escherichia coli cells. A gene encoding a homologue of ColM was detected within the exoU-containing genomic island A carried by certain pathogenic Pseudomonas aeruginosa strains. This bacteriocin (pyocin) that we have named PaeM was crystallized, and its structure with and without an Mg(2+) ion bound was solved. In parallel, site-directed mutagenesis of conserved PaeM residues from the C-terminal domain was performed, confirming their essentiality for the protein activity both in vitro (lipid II-degrading activity) and in vivo (cytotoxicity against a susceptible P. aeruginosa strain). Although PaeM is structurally similar to ColM, the conformation of their active sites differs radically; in PaeM, residues essential for enzymatic activity and cytotoxicity converge toward a same pocket, whereas in ColM they are spread along a particularly elongated active site. We have also isolated a minimal domain corresponding to the C-terminal half of the PaeM protein and exhibiting a 70-fold higher enzymatic activity as compared with the full-length protein. This isolated domain of the PaeM bacteriocin was further shown to kill E. coli cells when addressed to the periplasm of these bacteria.


    Organizational Affiliation

    Université Paris-Sud, Institut de Biochimie et Biophysique Moléculaire et Cellulaire, UMR 8619, F-91405 Orsay, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
phosphodiesteraseA297Pseudomonas aeruginosaMutation(s): 0 
Gene Names: EXA13PaeM
Find proteins for Q1W548 (Pseudomonas aeruginosa)
Explore Q1W548 
Go to UniProtKB:  Q1W548
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.92α = 90
b = 71.5β = 90
c = 99.94γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
SHARPphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-09-12
    Type: Initial release
  • Version 1.1: 2012-09-26
    Changes: Database references
  • Version 1.2: 2012-11-07
    Changes: Structure summary
  • Version 1.3: 2012-11-14
    Changes: Database references