Luminescence, ( ISI ), Volume (31), No (1), Year (2015-1) , Pages (22-29)

Title : ( Biophysical probing of the binding properties of a Cu(II) complex with G‐quadruplex DNA: an experimental and computational study )

Authors: Mohammad Reza Housaindokht , asma verdian ,

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Abstract

Telomerase inhibition through G-quadruplex stabilization by small molecules is of great interest as a novel anticancer therapeutic strategy. Here, we show that newly synthesized Cu-complex binds to G-quadruplex DNA and induces changes in its stability. This biophysical interaction was investigated in vitro using spectroscopic, voltammetric and computational techniques. The binding constant for this complex to G-quadruplex using spectroscopic and electrochemical methods is in the order of 105. The binding stoichiometry was investigated using spectroscopic techniques and corresponded to a ratio of 1: 1. Fluorescence titration results reveal that Cu-complex is quenched in the presence of G-quadruplex DNA. Analysis of the fluorescence emission at different temperatures shows that ΔH°>0, ΔS°>0 and ΔG°<0, and indicates that hydrophobic interactions played a major role in the binding processes. MD simulation results suggested that this ligand could stabilize the G-quadruplex structure. An optimized docked model of the G-quadruplex–ligandmixture confirmed the experimental results. Based on the results, we conclude that Cu-complex as an anticancer candidate can bind and stabilize the G-quadruplex DNA structure.

Keywords

, G, quadruplex; UV–vis; fluorescence; voltammetry; molecular dynamics simulation
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@article{paperid:1047766,
author = {Housaindokht, Mohammad Reza and Verdian, Asma},
title = {Biophysical probing of the binding properties of a Cu(II) complex with G‐quadruplex DNA: an experimental and computational study},
journal = {Luminescence},
year = {2015},
volume = {31},
number = {1},
month = {January},
issn = {1522-7235},
pages = {22--29},
numpages = {7},
keywords = {G-quadruplex; UV–vis; fluorescence; voltammetry; molecular dynamics simulation},
}

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%0 Journal Article
%T Biophysical probing of the binding properties of a Cu(II) complex with G‐quadruplex DNA: an experimental and computational study
%A Housaindokht, Mohammad Reza
%A Verdian, Asma
%J Luminescence
%@ 1522-7235
%D 2015

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