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Int. J. Mol. Sci. 2018, 19(1), 222; doi:10.3390/ijms19010222

Antibacterial Evaluation and Virtual Screening of New Thiazolyl-Triazole Schiff Bases as Potential DNA-Gyrase Inhibitors

1
Department of Pharmaceutical Chemistry, “Iuliu Haţieganu” University of Medicine and Pharmacy, 41 Victor Babeş Street, RO-400012 Cluj-Napoca, Romania
2
Department of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine, 3-5 Mănăştur Street, RO-400372 Cluj-Napoca, Romania
3
Department of Pharmacognosy, “Iuliu Haţieganu” University of Medicine and Pharmacy, 12 Ion Creangă Street, RO-400010 Cluj-Napoca, Romania
4
National Institute for Research and Development for Cryogenic and Isotopic Technologies, 4th Uzinei Street, RO-240050 Râmnicu Vâlcea, Romania
5
SC Biotech Corp SRL, 4th Uzinei Street, RO-240050 Râmnicu Vâlcea, Romania
*
Authors to whom correspondence should be addressed.
Received: 23 November 2017 / Revised: 21 December 2017 / Accepted: 9 January 2018 / Published: 11 January 2018
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
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Abstract

The global spread of bacterial resistance to drugs used in therapy requires new potent and safe antimicrobial agents. DNA gyrases represent important targets in drug discovery. Schiff bases, thiazole, and triazole derivatives are considered key scaffolds in medicinal chemistry. Fifteen thiazolyl-triazole Schiff bases were evaluated for their antibacterial activity, measuring the growth inhibition zone diameter, the minimum inhibitory concentration (MIC), and the minimum bactericidal concentration (MBC), against Gram-positive (Staphylococcus aureus, Listeria monocytogenes) and Gram-negative (Escherichia coli, Salmonella typhimurium, Pseudomonas aeruginosa) bacteria. The inhibition of S. aureus and S. typhimurium was modest. Compounds B1, B2, and B9 showed a similar effect as ciprofloxacin, the antimicrobial reference, against L. monocytogenes. B10 displayed a better effect. Derivatives B1, B57, B9, and B1115 expressed MIC values lower than the reference, against L. monocytogenes. B5, B6, and B1115 strongly inhibited the growth of P. aeruginosa. All compounds were subjected to an in silico screening of the ADMET (absorption, distribution, metabolism, elimination, toxicity) properties. Molecular docking was performed on the gyrA and gyrB from L. monocytogenes. The virtual screening concluded that thiazolyl-triazole Schiff base B8 is the best drug-like candidate, satisfying requirements for both safety and efficacy, being more potent against the bacterial gyrA than ciprofloxacin. View Full-Text
Keywords: Schiff base; thiazole; triazole; antibacterial activity; ADMET; molecular docking; DNA-gyrase Schiff base; thiazole; triazole; antibacterial activity; ADMET; molecular docking; DNA-gyrase
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MDPI and ACS Style

Nastasă, C.; Vodnar, D.C.; Ionuţ, I.; Stana, A.; Benedec, D.; Tamaian, R.; Oniga, O.; Tiperciuc, B. Antibacterial Evaluation and Virtual Screening of New Thiazolyl-Triazole Schiff Bases as Potential DNA-Gyrase Inhibitors. Int. J. Mol. Sci. 2018, 19, 222.

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