Shahabadi N, Shiri F. Multispectroscopic studies on the interaction of a copper(ii) complex of ibuprofen drug with calf thymus DNA.
NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2016;
36:83-106. [PMID:
27835056 DOI:
10.1080/15257770.2016.1223305]
[Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The interaction of copper(II)-ibuprofenato complex with calf thymus DNA (ct-DNA) has been explored following, UV-visible spectrophotometry, fluorescence measurement, dynamic viscosity measurements, and circular dichroism spectroscopy. In spectrophotometric studies of ct-DNA it was found that [Cu(ibp)2]2 can form a complex with double-helical DNA. The association constant of [Cu(ibp)2]2 with DNA from UV-Vis study was found to be 6.19 × 104 L mol-1. The values of Kf from fluorescence measurement clearly underscore the high affinity of [Cu(ibp)2]2 to DNA. The experimental results showed that the conformational changes in DNA helix induced by [Cu(ibp)2]2 are the reason for the fluorescence quenching of the DNA-Hoechst system. In addition, the fluorescence emission spectra of intercalated methylene blue (MB) with increasing concentrations of [Cu(ibp)2]2 represented a significant increase of MB intensity as to release MB from MB-DNA system. The results of circular dichroism (CD) suggested that copper(II)-ibuprofenato complex can change the conformation of DNA. In addition, the results of viscosity measurements suggest that copper(II)-ibuprofenato complex may bind with non-classical intercalative mode. From spectroscopic and hydrodynamic studies, it has been found that [Cu(ibp)2]2 interacts with DNA by partial intercalation mode which contains intercalation and groove properties.
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