Abstract
We report a small, focused library of 30 diverse 2-amino-5-alkylidene-thiazol-4-ones that was assayed in a whole-cell antibacterial screen against a panel of several bacterial strains and a yeast. Most of the compounds exhibited modest to significant antibacterial activity against Pseudomonas aeruginosa, Bacillus subtilis and Staphylococcus aureus, and no activity against Salmonella typhimurium and Escherichia coli. The antibacterial activity depends markedly upon substituents on the thiazol-4-one core, and the most potent compound assayed (\((Z)\)-4-((2-(4-methylpiperidin-1-yl)-4-oxothiazol-5(4H)-ylidene)methyl)benzonitrile) reached a minimal inhibitory concentration (MIC) value of \(10\,\upmu \hbox {g/mL}\) on P. aeruginosa strain. An important feature of the tested compounds is their low influence on cell viability, as determined in a HEK-293 metabolic activity assay. In light of the encouraging in vitro antimicrobial assay results against several bacterial strains, we have generated a pharmacophore model using the Discovery studio 3.0 package (Accelrys Inc., San Diego, USA), which exposed the spatial arrangement of key molecular properties responsible for our observed MIC results. Considering the absence of a defined target and the limitation of the described approach to pool different scaffolds, the calculated pharmacophore model could be used for library enrichment to identify compounds with a thiazolidinone scaffold with improved antimicrobial potency and physico-chemical properties.
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Abbreviations
- ATCC:
-
American Type Culture Collection
- DMEM:
-
Dulbecco’s Modified Eagle Medium
- MIC:
-
Minimal inhibitory concentration
- NCCLS:
-
National Committee for Clinical Laboratory Standards
- SBDD:
-
Structure-based drug discovery
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Acknowledgments
The financial support of this work by EUR-INTAFAR Project and Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant No. 172044) is gratefully acknowledged. The authors thank Robert McKenzie for careful reading of the manuscript and all the useful suggestions.
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Jukič, M., Ɖorđević, A., Lazarević, J. et al. Antimicrobial activity and cytotoxicity of some 2-amino-5-alkylidene-thiazol-4-ones. Mol Divers 17, 773–780 (2013). https://doi.org/10.1007/s11030-013-9474-6
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DOI: https://doi.org/10.1007/s11030-013-9474-6