Crystal Structure of 3-hydroxydecanoyl-Acyl Carrier Protein Dehydratase (FabA) from Pseudomonas aeruginosa in complex with N-(4- Chlorobenzyl)-3-(2-furyl)-1H-1,2,4-triazol-5-amine

Experimental Data Snapshot

  • Resolution: 2.41 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

Starting Model: experimental
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A Substrate Mimic Allows High Throughput Assay of the Faba Protein and Consequently the Identification of a Novel Inhibitor of Pseudomonas Aeruginosa Faba.

Moynie, L.Hope, A.G.Finzel, K.Schmidberger, J.Leckie, S.M.Schneider, G.Burkart, M.D.Smith, A.D.Gray, D.W.Naismith, J.H.

(2016) J Mol Biol 428: 108-120

  • DOI: https://doi.org/10.1016/j.jmb.2015.10.027
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Eukaryotes and prokaryotes possess fatty acid synthase (FAS) biosynthetic pathways that comprise iterative chain elongation, reduction, and dehydration reactions. The bacterial FASII pathway differs significantly from human FAS pathways and is a long-standing target for antibiotic development against Gram-negative bacteria due to differences from the human FAS, and several existing antibacterial agents are known to inhibit FASII enzymes. N-Acetylcysteamine (NAC) fatty acid thioesters have been used as mimics of the natural acyl carrier protein pathway intermediates to assay FASII enzymes, and we now report an assay of FabV from Pseudomonas aeruginosa using (E)-2-decenoyl-NAC. In addition, we have converted an existing UV absorbance assay for FabA, the bifunctional dehydration/epimerization enzyme and key target in the FASII pathway, into a high-throughput enzyme coupled fluorescence assay that has been employed to screen a library of diverse small molecules. With this approach, N-(4-chlorobenzyl)-3-(2-furyl)-1H-1,2,4-triazol-5-amine (N42FTA) was found to competitively inhibit (pIC50=5.7±0.2) the processing of 3-hydroxydecanoyl-NAC by P. aeruginosa FabA. N42FTA was shown to be potent in blocking crosslinking of Escherichia coli acyl carrier protein and FabA, a direct mimic of the biological process. The co-complex structure of N42FTA with P. aeruginosa FabA protein rationalises affinity and suggests future design opportunities. Employing NAC fatty acid mimics to develop further high-throughput assays for individual enzymes in the FASII pathway should aid in the discovery of new antimicrobials.

  • Organizational Affiliation

    Biomedical Sciences Research Complex and EaStCHEM, School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, United Kingdom. Electronic address: lm108@st-andrews.ac.uk.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
171Pseudomonas aeruginosa PAO1Mutation(s): 0 
EC: (PDB Primary Data), (PDB Primary Data), (PDB Primary Data)
Find proteins for O33877 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore O33877 
Go to UniProtKB:  O33877
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO33877
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.41 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.61α = 90
b = 142.87β = 116.47
c = 77.85γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-21
    Type: Initial release
  • Version 1.1: 2015-11-18
    Changes: Database references
  • Version 1.2: 2015-11-25
    Changes: Database references
  • Version 1.3: 2016-03-02
    Changes: Database references
  • Version 1.4: 2018-06-13
    Changes: Data collection, Database references
  • Version 1.5: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description