Interaction of a curcumin analogue dimethoxycurcumin with DNA.

Abstract:

:Dimethoxycurcumin (Dimc), a synthetic analogue of curcumin, that has been reported to exhibit better in vivo stability and anti-tumour activity, was investigated for its interaction with DNA, employing spectroscopic methods based on absorption, fluorescence, circular dichroism (CD), ethidium bromide (EtBr) competitive binding assay, 4'-6-diamidino-2-phenylindole (DAPI) displacement assay and fluorescence resonance energy transfer (FRET) assay. The mean binding constant for its interaction with calf thymus DNA (ct-DNA) was estimated to be 4.4±0.8 × 10(4) m(-1) . The studies using CD revealed that Dimc did not cause unwinding of the ct-DNA helix or induce major conformational changes. The EtBr and DAPI assays indicated that Dimc is not an intercalator but a minor groove binder. FRET assay also confirmed that Dimc interacts with DNA strands. Furthermore, viscosity measurements of ct-DNA solutions in the presence of Dimc supported these spectroscopic observations. Addition of Dimc to MCF-7 cells showed nuclear localization as visualized by confocal microscopy. In conclusion, the present studies addressed the mode of interaction of Dimc with biomolecules, which may have implications in developing Dimc as a DNA-targeted drug.

journal_name

Chem Biol Drug Des

authors

Kunwar A,Simon E,Singh U,Chittela RK,Sharma D,Sandur SK,Priyadarsini IK

doi

10.1111/j.1747-0285.2011.01083.x

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

281-7

issue

4

eissn

1747-0277

issn

1747-0285

journal_volume

77

pub_type

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