Spectroscopic and thermodynamic insights into the interaction between proflavine and human telomeric G-quadruplex DNA

Vivek Kumar, Abhigyan Sengupta, Krishna Gavvala, Raj Kumar Koninti, Partha Hazra

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The G-quadruplex (GQ-DNA), an alternative structure motif of DNA, has emerged as a novel and exciting target for anticancer drug discovery. GQ-DNA formed in the presence of monovalent cations (Na+/K+) by human telomeric DNA is a point of interest due to their direct relevance for cellular aging and abnormal cell growths. Small molecules that selectively target and stabilize G-quadruplex structures are considered to be potential therapeutic anticancer agents. Herein, we probe G-quadruplex and proflavine (a well-known DNA intercalator, hence acting as an anticarcinogen) association through steady state and time-resolved fluorescence spectroscopy to explore the effect of stabilization of GQ-DNA by this well-known DNA intercalator. The structural modifications of G-quadruplex upon binding are highlighted through circular dichroism (CD) spectra. Moreover, a detailed insight into the thermodynamics of this interaction has been provided though isothermal titration calorimetry (ITC) studies. The thermodynamic parameters obtained from ITC help to gain knowledge about the nature as well as the driving forces of binding. This present study shows that proflavine (PF) can act as a stabilizer of telomeric GQ-DNA through an entropically as well as enthalpically feasible process with high binding affinity and thereby can be considered as a potential telomerase inhibitor.

Original languageEnglish
Pages (from-to)11090-11099
Number of pages10
JournalJournal of Physical Chemistry B
Issue number38
Publication statusPublished - Sept 25 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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