Spectroscopic studies on the thermodynamic and thermal denaturation of the ct-DNA binding of methylene blue

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
MudasirHidenari Inoue

Abstract

The ct-DNA binding properties of methylene blue (MB) including binding constant, thermodynamic parameter and thermal denaturation (T(m)) have been systematically studied by spectrophotometric method. The binding of MB to ct-DNA is quite strong as indicated by remarkable hypochromicity, red shift and equilibrium binding constant (K(b)). Van't Hoff plot of 1/T versus lnK(b) suggests that the MB dye binds exothermically to ct-DNA which is characterized by large negative enthalpy and entropy changes. According to polyelectrolyte theory, the charge release (Z) when ct-DNA interacts with MB is +1.09 which corresponds very well to the one positive charge carried by the MB dye. The K(b) at a low concentration of salt is dominated by electrostatic interaction (90%) while that at a high concentration of salt is mostly controlled by non-electrostatic process (85%). However, the stabilization of the DNA binding event in both cases is governed by non-electrostatic process. A moderate stabilization of double helix ct-DNA occurs when the MB dye binds to ct-DNA as indicated by the increase in T(m) of ct-DNA of about 5.5 degrees C in the presence of MB. This suggests that MB dye possibly binds to ct-DNA via electrostatic and intercalation modes.

References

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Citations

Jul 3, 2013·European Journal of Medicinal Chemistry·Kamaljit SinghJan Balzarini
May 11, 2013·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Shufang ZhangRongmei Kong
Mar 19, 2015·Luminescence : the Journal of Biological and Chemical Luminescence·Bing-Mi LiuBin Liu
Nov 24, 2011·Analytical Biochemistry·Ana Maria Soto, David Draper
Apr 2, 2015·Bioorganic Chemistry·Jana JanočkováMária Kožurková
Mar 29, 2011·International Journal of Biological Macromolecules·Yumei GuoBaoyu Gao
Mar 21, 2015·Bioorganic & Medicinal Chemistry·Prinka SinglaKamaldeep Paul
Aug 7, 2012·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Azza A Shoukry, Mervat S Mohamed
Sep 3, 2013·European Journal of Medicinal Chemistry·Meenakshi VermaKamaldeep Paul
Dec 21, 2013·Journal of Medicinal Chemistry·Kamaljit SinghJan Balzarini
Dec 3, 2014·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Azza A Shoukry, Reem M Alghanmi
Jul 31, 2020·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Mohan KumarShrikant Kukreti

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