1. New N-phenylpyrrolamide DNA gyrase B inhibitors: Optimization of efficacy and antibacterial activity.
- Author
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Durcik M, Lovison D, Skok Ž, Durante Cruz C, Tammela P, Tomašič T, Benedetto Tiz D, Draskovits G, Nyerges Á, Pál C, Ilaš J, Peterlin Mašič L, Kikelj D, and Zidar N
- Subjects
- Amides cerebrospinal fluid, Amides chemistry, Anti-Bacterial Agents chemical synthesis, Anti-Bacterial Agents chemistry, Dose-Response Relationship, Drug, Escherichia coli enzymology, Microbial Sensitivity Tests, Molecular Structure, Pyrroles cerebrospinal fluid, Pyrroles chemistry, Staphylococcus aureus enzymology, Structure-Activity Relationship, Topoisomerase II Inhibitors chemical synthesis, Topoisomerase II Inhibitors chemistry, Amides pharmacology, Anti-Bacterial Agents pharmacology, DNA Gyrase metabolism, Enterococcus faecalis drug effects, Escherichia coli drug effects, Pyrroles pharmacology, Staphylococcus aureus drug effects, Topoisomerase II Inhibitors pharmacology
- Abstract
The ATP binding site located on the subunit B of DNA gyrase is an attractive target for the development of new antibacterial agents. In recent decades, several small-molecule inhibitor classes have been discovered but none has so far reached the market. We present here the discovery of a promising new series of N-phenylpyrrolamides with low nanomolar IC
50 values against DNA gyrase, and submicromolar IC50 values against topoisomerase IV from Escherichia coli and Staphylococcus aureus. The most potent compound in the series has an IC50 value of 13 nM against E. coli gyrase. Minimum inhibitory concentrations (MICs) against Gram-positive bacteria are in the low micromolar range. The oxadiazolone derivative 11a, with an IC50 value of 85 nM against E. coli DNA gyrase displays the most potent antibacterial activity, with MIC values of 1.56 μM against Enterococcus faecalis, and 3.13 μM against wild type S. aureus, methicillin-resistant S. aureus (MRSA) and vancomycin-resistant Enterococcus (VRE). The activity against wild type E. coli in the presence of efflux pump inhibitor phenylalanine-arginine β-naphthylamide (PAβN) is 4.6 μM., (Copyright © 2018 Elsevier Masson SAS. All rights reserved.)- Published
- 2018
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