5FP2

Crystal structure of the siderophore receptor PirA from Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.97 Å
  • R-Value Free: 0.319 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.265 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and Function of the PiuA and PirA Siderophore-Drug Receptors from Pseudomonas aeruginosa and Acinetobacter baumannii.

Moynie, L.Luscher, A.Rolo, D.Pletzer, D.Tortajada, A.Weingart, H.Braun, Y.Page, M.G.Naismith, J.H.Kohler, T.

(2017) Antimicrob Agents Chemother 61

  • DOI: https://doi.org/10.1128/AAC.02531-16
  • Primary Citation of Related Structures:  
    5FOK, 5FP1, 5FP2, 5FR8

  • PubMed Abstract: 

    The outer membrane of Gram-negative bacteria presents an efficient barrier to the permeation of antimicrobial molecules. One strategy pursued to circumvent this obstacle is to hijack transport systems for essential nutrients, such as iron. BAL30072 and MC-1 are two monobactams conjugated to a dihydroxypyridone siderophore that are active against Pseudomonas aeruginosa and Acinetobacter baumannii Here, we investigated the mechanism of action of these molecules in A. baumannii We identified two novel TonB-dependent receptors, termed Ab -PiuA and Ab -PirA, that are required for the antimicrobial activity of both agents. Deletion of either piuA or pirA in A. baumannii resulted in 4- to 8-fold-decreased susceptibility, while their overexpression in the heterologous host P. aeruginosa increased susceptibility to the two siderophore-drug conjugates by 4- to 32-fold. The crystal structures of PiuA and PirA from A. baumannii and their orthologues from P. aeruginosa were determined. The structures revealed similar architectures; however, structural differences between PirA and PiuA point to potential differences between their cognate siderophore ligands. Spontaneous mutants, selected upon exposure to BAL30072, harbored frameshift mutations in either the ExbD3 or the TonB3 protein of A. baumannii , forming the cytoplasmic-membrane complex providing the energy for the siderophore translocation process. The results of this study provide insight for the rational design of novel siderophore-drug conjugates against problematic Gram-negative pathogens.


  • Organizational Affiliation

    Biomedical Sciences Research Complex, University of St Andrews, St Andrews, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FERRIC ENTEROBACTIN RECEPTOR PIRA
A, B
725Pseudomonas aeruginosa PAO1Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q9I527 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I527 
Go to UniProtKB:  Q9I527
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I527
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
FERRIC ENTEROBACTIN RECEPTOR PIRAC [auth X],
D [auth Z]
10Pseudomonas aeruginosa PAO1Mutation(s): 0 
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.97 Å
  • R-Value Free: 0.319 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.265 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 183.12α = 90
b = 95.28β = 127.52
c = 131.83γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
xia2data reduction
XDSdata reduction
xia2data scaling
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-09
    Type: Initial release
  • Version 1.1: 2017-05-03
    Changes: Database references
  • Version 1.2: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description