Bacterial DNA gyrase and topoisomerase IV are well-characterized targets for both fluoroquinolones (e. g. Ciprofloxacin), which inhibit the catalytic subunits GyrA/ParC, and aminocoumarins (e. g. Novobiocin), which act as GyrB/ParE ATPase inhibitors. Due to the emergence of resistance to the first class, and the safety issues related to the latter, current research is aimed at developing novel synthetic inhibitors for GyrB/ParE in order to overcome the limitations of available drugs. A novel series of benzimidazole derivatives, carrying various functional groups or heterocyclic rings, were synthesized and evaluated for their in vitro antibacterial effect. The majority of the new benzimidazole derivatives showed Gram positive antibacterial activity . Compounds 7 d, 12 a,b and 14 a were selected for the assessment of their binding affinity and enzyme inhibitory activity against the E.coli DNA gyrase and the S. aureus topoisomerase IV. The results revealed good binding as well as dual inhibition against both enzymes. Compounds 7 d (% inhibition 87.71, IC 50 : 0.61 uM) and 14 a (% inhibition: 89.3, IC 50 : 0.58 uM) showed the best results against the E.coli DNA gyrase and the S. aureus topoisomerase IV, respectively. In silico studies revealed a potential good oral absorption of compounds due to compatibility with Lipinski's rule of five. Compound 14 a showed both good druglikeness (3.76) and drug score (0.76) values giving it potential as a promising new drug.[a] O.
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