A thermodynamic approach for the targeting of nucleic acid structures using their complementary single strands

Hui Ting Lee, Caroline Carr, Hollie Siebler, Lela Waters, Irine Khutsishvili, Fany Iseka, Brian Domack, Chris M. Olsen, Luis A. Marky

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The main focus of our investigations is to further our understanding of the physicochemical properties of nucleic acid structures. We report on a thermodynamic approach to study the reaction of a variety of intramolecular nucleic acid structures with their respective complementary strands. Specifically, we have used a combination of isothermal titration (ITC) and differential scanning calorimetry (DSC) and spectroscopy techniques to determine standard thermodynamic profiles for the reaction of a triplex, G-quadruplex, hairpin loops, pseudoknot, and three-arm junctions with their complementary strands. Reaction enthalpies are measured directly in ITC titrations, and compared with those obtained indirectly from Hess cycles using DSC unfolding data. All reactions investigated yielded favorable free energy contributions, indicating that each single strand is able to invade and disrupt the corresponding intramolecular DNA structure. These favorable free energy terms are enthalpy-driven, resulting from a favorable compensation of exothermic contributions due to the formation of additional base-pair stacks in the duplex product, and endothermic contributions, from the disruption of base stacking contributions of the reactant single strands. The overall results provide a thermodynamic approach that can be used in the targeting of nucleic acids, especially the secondary structures formed by mRNA, with oligonucleotides for the control of gene expression.

Original languageEnglish (US)
Pages (from-to)1-26
Number of pages26
JournalMethods in Enzymology
Volume492
DOIs
StatePublished - 2011

Keywords

  • Antisense
  • DNA secondary structures
  • Heat
  • Targeting nucleic acid strands
  • Thermodynamics

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology

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