In-Silico Design and Synthetic Studies of DNA-Gyrase Inhibitors : Design, Synthesis and Anti-bacterial activity of 5,7-dihydroxy-4-methylcoumarin derivatives as DNA-gyrase inhibitors

Coumarins are important class of compounds, isomeric to quinolones. They may become promising candidates for exploiting more useful therapeutically active molecules. DNA-gyrase has drawn much attention as selected target for finding potent anti-bacterial agents against multi-drug resistant strains such as methicillin-resistant Staphyloccus aureus (MRSA), vancomycin-resistant enterococci (VRE), penicillin-resistant Streptococci pneumonia (PRSP). The objective of the present study was, to study the molecular docking simulations on 5,7-dihydroxy-4-methyl coumarin analogues as probable candidates for inhibiting DNA gyrase subunit-B of S.aureus. In the present study, Docking simulations were carried out on the reported inhibitors of DNA-gyrase subunit A and B using docking software. Based on it, Series of 5,7-dihydroxy-4-methylcoumarin analogues (PH-1 to PH-9) were designed, synthesized, characterized and evaluated for its anti-bacterial activity against S.aureus and E.coli. Out of the nine test compounds, compound PH-4 showed good anti-bacterial activity against S.aureus and E.coli than rest of other compounds.