4CL6

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

Summary for 4CL6

• Entry DOI: 10.2210/pdb4cl6/pdb
• Descriptor: 3-HYDROXYDECANOYL-[ACYL-CARRIER-PROTEIN] DEHYDRATASE, N-(4-chlorobenzyl)-5-(furan-2-yl)-1H-1,2,4-triazol-3-amine (3 entities in total)
• Functional Keywords: lyase, fatty acid biosynthesis, bacterial virulence, drug discovery
• Biological source: PSEUDOMONAS AERUGINOSA PAO1
• Total number of polymer chains: 5
• Total formula weight: 95216.19

Authors

Moynie, L.,McMahon, S.A.,Duthie, F.G.,Naismith, J.H. (deposition date: 2014-01-13, release date: 2015-01-21, Last modification date: 2023-12-20)

Primary citation

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.
A Substrate Mimic Allows High Throughput Assay of the Faba Protein and Consequently the Identification of a Novel Inhibitor of Pseudomonas Aeruginosa Faba.
J.Mol.Biol., 428:108-120, 2016

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.

PubMed: 26562505
DOI: 10.1016/J.JMB.2015.10.027

Experimental method

X-RAY DIFFRACTION (2.41 Å)