Monitoring RNA-ligand interactions using isothermal titration calorimetry. Journal Article uri icon



  • Isothermal titration calorimetry (ITC) is a biophysical technique that measures the heat evolved or absorbed during a reaction to report the enthalpy, entropy, stoichiometry of binding, and equilibrium association constant. A significant advantage of ITC over other methods is that it can be readily applied to almost any RNA-ligand complex without having to label either molecule and can be performed under a broad range of pH, temperature, and ionic concentrations. During our application of ITC to investigate the thermodynamic details of the interaction of a variety of compounds with the purine riboswitch, we have explored and optimized experimental parameters that yield the most useful and reproducible results for RNAs. In this chapter, we detail this method using the titration of an adenine-binding RNA with 2,6-diaminopurine (DAP) as a practical example. Our insights should be generally applicable to observing the interactions of a broad range of molecules with structured RNAs.

publication date

  • January 1, 2009

has restriction

  • closed

Date in CU Experts

  • September 3, 2013 12:07 PM

Full Author List

  • Gilbert SD; Batey RT

author count

  • 2

Other Profiles

International Standard Serial Number (ISSN)

  • 1064-3745

Additional Document Info

start page

  • 97

end page

  • 114


  • 540