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Mutation induced conformational changes in genomic DNA from cancerous K562 cells influence drug-DNA binding modes

Debjani Ghosh1, Subrata Kumar Dey1, Chabita Saha1

  • 1School of Biotechnology and Biological Sciences, West Bengal University of Technology, Salt Lake, Kolkata, India.

Plos One
|January 14, 2014
PubMed

Insights

Mutations alter DNA structure, affecting anticancer drug binding. This research suggests designing drugs that target these specific DNA structural changes in cancer cells for improved efficacy.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Cancer cells often exhibit genetic mutations leading to altered DNA structures.
  • Understanding drug-DNA interactions is crucial for developing effective cancer therapies.

Purpose of the Study:

  • To investigate the thermodynamic and structural differences in the interaction of anticancer drugs (adriamycin and daunomycin) with normal human genomic DNA (N-DNA) and mutated DNA (M-DNA) from K562 leukemic cells.
  • To correlate these differences with potential drug binding events and DNA structural transitions.

Main Methods:

  • Isothermal titration calorimetry to analyze drug-DNA binding thermodynamics.
  • Raman spectroscopy to identify DNA structural forms (A-form, B-form).
  • Dynamic light scattering and zeta potential measurements to assess structural and binding differences.

Main Results:

  • Mutated DNA (M-DNA) and normal DNA (N-DNA) exhibit distinct thermodynamic properties and binding affinities for adriamycin and daunomycin.
  • M-DNA showed a partial transformation to the A-form, while N-DNA also transitioned to the A-form upon drug binding.
  • Analysis revealed sequential binding events including minor groove complexation, drug reorientation, DNA deformation, and intercalation.

Conclusions:

  • Genetic mutations induce structural changes in DNA, significantly influencing the binding efficacy of anticancer drugs.
  • Future drug design strategies should consider targeting the unique DNA structural alterations present in cancer cells for enhanced therapeutic outcomes.

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