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- W2610736154 abstract "The water soluble mixed ligand complexes [Cu(nal)(diimine)(H2O)](ClO4) 1-4, where H(nal) is nalidixic acid and diimine is 2,2'-bipyridine (1), 1,10-phenanthroline (2), 5,6-dimethyl-1,10-phenanthroline (3), and 3,4,7,8-tetramethyl-1,10-phenanthroline (4), have been isolated. The coordination geometry around Cu(II) in 1 and that in the Density Functional Theory optimized structures of 1-4 has been assessed as square pyramidal. The trend in DNA binding constants (Kb) determined using absorption spectral titration (Kb: 1, 0.79±0.1<2, 1.06±0.1<3, 1.79±0.2<4, 1.84±0.2×105M-1) is in line with that (Kapp) determined by competitive ethidium bromide binding studies. The large red-shift (10nm) observed for 2 suggests that the phen co-ligand is stacked with a frayed DNA base pair. In contrast, 3 and 4 are involved in intimate hydrophobic interaction with DNA through the methyl substituents on phen ring, which is supported by viscosity and protein binding studies. DNA docking studies imply that 4 is involved preferentially in DNA major groove binding while 1-3 in minor groove binding and that all the complexes, upon removing the axially coordinated water molecule, bind in the major groove. Interestingly, 3 and 4 display prominent double-strand DNA cleavage while 1 and 2 effect only single-strand DNA cleavage in the absence of an activator. The complexes 3 and 4 show cytotoxicity higher than 1 and 2 against human breast cancer cell lines (MCF-7). The complex 4 induces apoptotic mode of cell death in cancer cells." @default.
- W2610736154 created "2017-05-12" @default.
- W2610736154 creator A5011490188 @default.
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- W2610736154 creator A5052978590 @default.
- W2610736154 creator A5072644626 @default.
- W2610736154 creator A5091597700 @default.
- W2610736154 date "2017-09-01" @default.
- W2610736154 modified "2023-10-03" @default.
- W2610736154 title "DNA and protein binding, double-strand DNA cleavage and cytotoxicity of mixed ligand copper(II) complexes of the antibacterial drug nalidixic acid" @default.
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