Abstract
A new Dichlorotetra(4-hydroxy-N'-(pyridin-4-ylmethylene)benzohydrazone)Ru(II) complex 1 has been synthesized and characterized using spectroscopic techniques. The structure of complex 1 has been optimized through ORCA computational programme package using B3LYP functionals. The complex binds efficiently with calf thymus DNA (CT-DNA) as monitored by UV-visible titrations (Kb = 4.8 × 105), ethidium bromide displacement studies (Ksv = 1.39) as well as Circular Dichroism (CD) titrations. The complex intercalates with DNA base pairs. It shows cleavage of supercoiled (SC) DNA into nicked circular (NC) DNA efficiently via oxidative pathway. Complex 1 also inhibits Topoisomerase I (Topo I) relaxation activity at concentration < 20 μM. The molecular docking studies support that Topo I inhibition occur via blocking religation of G11 hydroxyl group.
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