4CV0 image
Entry Detail
PDB ID:
4CV0
Keywords:
Title:
Crystal structure of S. aureus FabI in complex with NADPH and CG400549 (small unit cell)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-03-22
Release Date:
2014-04-16
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.27
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ENOYL-[ACYL-CARRIER-PROTEIN] REDUCTASE [NADPH]
Mutations:YES
Chain IDs:A, B, C, D
Chain Length:282
Number of Molecules:4
Biological Source:STAPHYLOCOCCUS AUREUS
Primary Citation
Rational Design of Broad Spectrum Antibacterial Activity Based on a Clinically Relevant Enoyl-Acyl Carrier Protein (Acp) Reductase Inhibitor.
J.Biol.Chem. 289 15987 ? (2014)
PMID: 24739388 DOI: 10.1074/JBC.M113.532804

Abstact

Determining the molecular basis for target selectivity is of particular importance in drug discovery. The ideal antibiotic should be active against a broad spectrum of pathogenic organisms with a minimal effect on human targets. CG400549, a Staphylococcus-specific 2-pyridone compound that inhibits the enoyl-acyl carrier protein reductase (FabI), has recently been shown to possess human efficacy for the treatment of methicillin-resistant Staphylococcus aureus infections, which constitute a serious threat to human health. In this study, we solved the structures of three different FabI homologues in complex with several pyridone inhibitors, including CG400549. Based on these structures, we rationalize the 65-fold reduced affinity of CG400549 toward Escherichia coli versus S. aureus FabI and implement concepts to improve the spectrum of antibacterial activity. The identification of different conformational states along the reaction coordinate of the enzymatic hydride transfer provides an elegant visual depiction of the relationship between catalysis and inhibition, which facilitates rational inhibitor design. Ultimately, we developed the novel 4-pyridone-based FabI inhibitor PT166 that retained favorable pharmacokinetics and efficacy in a mouse model of S. aureus infection with extended activity against Gram-negative and mycobacterial organisms.

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