Introduction: In general, 9-aminoacridine derivatives are inhibiting DNA topoisomerase II (topoII) because of their strong activity due to the ability of acridine nucleus to intercalate into DNA base pair. To get insight of the intermolecular interactions, the molecular docking studies are performed at active site of topoisomerase II. Aim: In this study, an attempt is made for identification of potential ligands from oxazine substituted 9-anilino acridines targeted against topoisomerase-II (1ZXM) using molecular modelling and docking studies by using Schrodinger suit-2012 Maestro 9.3 version. Insilco ADMET screening also performed by qikprop module of Schrodinger suit. Results: The relative binding affinity of the designed compounds towards topoisomerase-II (1ZXM) was selected on the basis of docking score, GLIDE score and interaction patterns. Several compounds showed strong hydrogen bonding interactions with amino acid residues and their hydrophobic interactions and other parameters could also explain their potency to inhibit topoisomerase-II (1ZXM). The oxazine substituted 9-anilino acridine derivatives 1a- 1k have good binding affinity with Glide score in the range of -5.7 to -8.06 when compared with the standard ledacrine (-5.24). The ADMET screening of the designed compounds have almost all the properties of the compounds are within the recommended values. Conclusion: Hence, this study provides evidence for consideration of valuable ligands in oxazine substituted 9-anilino acridine derivatives as potential topoisomerase-II inhibitor and further in vitro and in vivo investigations may prove its therapeutic potential.
Key words: Topoisomerase-II, Acridine, Oxazine, Antitumour, Docking studies, Insilico ADMET screening.
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